CN115807508A - Construction method and node for building steel structure column base installation foundation - Google Patents
Construction method and node for building steel structure column base installation foundation Download PDFInfo
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- CN115807508A CN115807508A CN202211592215.8A CN202211592215A CN115807508A CN 115807508 A CN115807508 A CN 115807508A CN 202211592215 A CN202211592215 A CN 202211592215A CN 115807508 A CN115807508 A CN 115807508A
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Abstract
The invention discloses a construction method and a node for a steel structure column base installation foundation of a building, which are used for solving the problems of difficult installation, difficult construction and poor installation precision of the steel column base construction with an inclination angle in the prior art. The high-strength anchor rod comprises a raft foundation, an anchor rod mounting frame, a high-strength anchor rod assembly, a wedge-shaped base plate and a steel upright column, wherein a locking nut, an anchoring end plate, an asbestos base plate, a gasket and a hexagon nut are sequentially installed in a thread section at the lower end of the high-strength anchor rod from bottom to top; the high-strength anchor rod is in a prestressed tensioning state, and grouting filler is arranged between the high-strength anchor rod and the protection conduit; and the high-strength anchor rod and the vertical direction form an alpha included angle. Through the spherical nut designed at the tensioning end of the high-strength anchor rod, the spherical matching can adjust and eliminate the small deviation of the installation angle of part of the anchor rod.
Description
Technical Field
The invention relates to the technical field of steel structure building construction, in particular to a construction installation method of a prestressed long anchor rod in a steel structure foundation.
Background
In the housing construction field, especially in the steel construction building field, the steel column structure that exists in a large number, steel column generally are vertical setting, and its lower extreme is fixed on the steel-concrete basis, and the upper end is used for installing girder steel or floor structure, and under general static condition, what bear is forward pressure. Therefore, in the existing steel structure building, the steel upright post and the reinforced concrete foundation are mechanically connected by adopting a high-strength embedded anchor rod or a common embedded anchor rod.
The structure that can be referred to in the connection node structure between steel stand and the steel-concrete foundation among the prior art is as follows:
CN217630845U discloses a steel column foot structure and steel construction. The steel upright foot structure comprises a steel upright, an upright bottom plate, a plurality of stiffening ribs and shear keys, wherein the upright bottom plate is fixedly connected with the bottom of the steel upright, covers the bottom of the steel upright and exceeds the steel upright towards the peripheral side of the steel upright so as to leave an outer convex edge at the peripheral side of the steel upright; the stiffening ribs extend upwards from the upper surface of the outer convex edge, the stiffening ribs are radially distributed outwards along the peripheral side of the steel upright column, and each stiffening rib is fixedly connected with the steel upright column; the shear key extends downwards from the lower surface of the column bottom plate and is used for extending into a groove formed in the concrete foundation; the column bottom plate is used for being vertically separated from the concrete foundation, a gap is formed between the column bottom plate and the concrete foundation, a secondary-poured micro-expansion fine stone concrete layer is filled in the gap, an anchor bolt through hole is formed in the overhanging edge and matched with an anchor bolt pre-buried in the concrete foundation, and the column bottom plate is fixed with the concrete foundation. In the technology, the steel upright is in a vertical state of 90 degrees, and belongs to a conventional steel upright structure.
The structure is suitable for the conventional condition that the steel upright post is in a vertical state.
Today, in pursuit of building individuality, steel columns having an inclination angle are also produced. In a certain project carried by the unit, the steel upright post has a vertical +/-5-degree inclination angle and bears forward pressure in a conventional state. However, a certain tensile stress is born under the extreme conditions of earthquakes and the like, so that the stress requirement of the steel upright is higher.
Moreover, as can be seen from the simulation of the mechanics finite element analysis software, in the structural design, the anchor rod or the anchor rod connection between the steel upright post and the steel-concrete foundation has the risk of failure, which brings challenges to the construction of the unit.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a construction method and a node for a mounting foundation of a steel structure column base of a building, which are used for solving the problems of difficult mounting, difficult construction and poor mounting precision of the construction of the steel column base with an inclined angle in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a construction method of a foundation for installing a steel structure column base of a building is characterized in that,
the method comprises the steps that firstly, the accurate positions and the inclination angles of all high-strength anchor rods in each steel upright post installation node are sampled in a computer, drawing drawings of an anchor rod installation frame and an auxiliary support frame by using each steel upright post as a unit module through computer-aided design is carried out, and the anchor rod installation frame and the auxiliary support frame are manufactured according to the drawings; mechanically connecting the anchor rod mounting frame with the auxiliary support frame, and installing a high-strength anchor rod component in the anchor rod mounting frame according to design requirements, wherein the high-strength anchor rod component consists of a high-strength anchor rod, a hexagon nut, a spherical nut, a protection conduit, a grouting pipe, a locking nut, an asbestos base plate and a gasket;
secondly, measuring the position of each embedded part of the anchor rod mounting rack according to a peripheral axis control point and an elevation control point in the construction stage of the waterproof cushion of the raft, pouring cushion concrete after the embedded parts are mounted, and curing the concrete until the concrete is hardened after the positions of the embedded parts are retested to be qualified; then, integrally hoisting the anchor rod mounting frame and the auxiliary support frame in place, welding the anchor rod mounting frame and the embedded part after the anchor rod mounting frame is positioned and corrected, welding the auxiliary support frame and the embedded part, and retesting the accurate position and the inclination angle of the high-strength anchor rod after the welding is finished;
binding a reinforcement cage in the raft foundation groove, monitoring the high-strength anchor rod by using a total station in the reinforcement binding process, and avoiding directly laying the reinforcement on the anchor rod mounting frame when binding the reinforcement on site; after the steel bars are bound and before concrete pouring, retesting the high-strength anchor rod by using a total station, correcting the position precision and the inclination angle of the high-strength anchor rod, and entering a concrete pouring process after the high-strength anchor rod is qualified;
fourthly, before concrete pouring, coating grease on the upper end threads of the high-strength anchor rod, wrapping plastic paper and sleeving a plastic pipe; the upper port of the grouting pipe extends out of the top surface of the concrete pouring and is completely sealed by adhesive tape, so that a vibration rod is prevented from contacting the high-strength anchor rod in the concrete pouring process, and the position precision and the inclination angle of the high-strength anchor rod are synchronously monitored by using a total station;
fifthly, after the concrete is hardened, cutting off the part of the anchor rod mounting frame exposed above the surface of the concrete, and retesting the position precision and the inclination angle of each high-strength anchor rod;
sixthly, mounting the steel upright posts: detaching a spherical bolt at the upper end of a high-strength anchor rod, smearing sealant outside an exposed protective guide pipe, aligning a mounting round hole in a bottom plate of a steel column base to the high-strength anchor rod and mounting the anchor rod on a raft foundation, leveling the bottom plate of the steel column base to reach a designed elevation, grouting in a space below the bottom plate of the steel column base and curing to be hardened, sequentially sleeving a wedge-shaped base plate and a spherical nut on the high-strength anchor rod, wherein the spherical nut is in spherical fit with a spherical positioning hole in the wedge-shaped base plate, preliminarily pre-tightening the spherical nut, and eliminating the mounting angle deviation of the high-strength anchor rod by adjusting the angle of the spherical nut in the preliminary pre-tightening process; after the high-strength anchor rods around the steel upright post are preliminarily pre-tightened, a hydraulic tensioning tool is used for carrying out prestress tensioning on the upper ends of the high-strength anchor rods, spherical nuts are fastened, the tensioning sequence adopts the opposite side fastening principle to be tensioned one by one, and finally grouting is carried out from a grouting pipe to the inside of a protection conduit through grouting equipment until continuous grout overflows from an overflow hole in an anchoring base plate, so that all grouting is completed one by one and the maintenance is qualified.
Further, in the first step, the assembly of the high-strength anchor rod assembly in the anchor mounting frame comprises the following specific steps:
the method comprises the following steps that 1, a protective guide pipe is arranged in an anchor rod mounting frame, the upper end of the protective guide pipe just extends out of the upper surface of a sleeve frame, the protective guide pipe and the anchor rod mounting frame are obliquely arranged at an angle alpha and are welded and fixed, and the upper end and the lower end of the protective guide pipe respectively correspond to anchor rod through holes in an upper steel plate and a lower steel plate of the anchor rod mounting frame; hoisting and inserting a high-strength anchor rod into the protection guide pipe from top to bottom, wherein hoisting points are set in a mode that a temporary nut is installed at the upper end of a rod body and a lifting lug is welded on the temporary nut, the upper end and the lower end of the high-strength anchor rod are respectively inserted into anchor rod through holes of an upper steel plate and a lower steel plate, after the high-strength anchor rod is installed in place, a locking nut, an anchoring end plate, an asbestos base plate, a gasket and a hexagon nut are sequentially installed in a lower end thread section from bottom to top, the anchoring end plate is fixed by the hexagon nut, then the hook is lifted and loosened, the temporary nut is removed, a spherical nut is installed, primary positioning of the upper end of the anchor rod is realized through locking between the spherical nut and the upper steel plate, and installation of the high-strength anchor rod assembly is completed;
installing a grouting pipe, welding and connecting the grouting pipe and a protective guide pipe to form a grouting channel, wherein the grouting pipe extends upwards in an inclined mode and is led out of the elevation point of the raft foundation;
substep 3, repeating substep 1 and substep 2, and finishing the installation of all high-strength anchor rod components;
step 4, marking steel column control points on a steel plate on the anchor rod mounting frame, correcting the positioning size and the inclination angle of each high-strength anchor rod, then respectively fastening a spherical nut and a hexagonal nut again, and then welding the protective conduit and the anchoring end plate in a surrounding manner; finally, the anchoring end plate is welded with the lower steel plate of the sleeve frame;
and step 5, mechanically connecting the auxiliary support frame and the anchor rod mounting frame by using a connecting plate in a shape of Chinese character 'ji'.
Furthermore, the mounting positions of embedded parts in the waterproof bedding layer of the raft are deepened.
A mounting node of a column foot of a building steel structure comprises a raft foundation, an anchor rod mounting frame, high-strength anchor rod components, wedge-shaped base plates and steel columns, wherein a plurality of high-strength anchor bolt components are fixed in the anchor rod mounting frame, and the anchor rod mounting frame and the high-strength anchor bolt components are mounted in the raft foundation,
the high-strength anchor rod component consists of a high-strength anchor rod, a hexagonal nut, a spherical nut, a protective guide pipe, a grouting pipe, a locking nut, an asbestos base plate and a gasket; the lower end screw thread section of the high-strength anchor rod is sequentially provided with a locking nut, an anchoring end plate, an asbestos base plate, a gasket and a hexagon nut from bottom to top, the anchoring end plate is welded with a protection conduit, the lower end of the protection conduit is welded with a grouting pipe, and the upper end of the protection conduit is connected with a mounting hole in a steel column base bottom plate; the upper end of the high-strength screw rod is sequentially provided with a wedge-shaped base plate and a spherical nut from top to bottom, and the spherical nut is in spherical fit with a spherical positioning hole in the wedge-shaped base plate; the high-strength anchor rod is in a prestressed tensioning state, and grouting filler is arranged between the high-strength anchor rod and the protection guide pipe; the protection conduit and the anchoring end plate are respectively welded with the anchor rod mounting frame, and the high-strength anchor rod and the vertical direction form an alpha included angle; the raft foundation is of a steel-concrete structure, and the internal reinforcement cage is not in contact with the anchor rod mounting frame.
Further, still include auxiliary stay frame, auxiliary stay frame is located the periphery of stock mounting bracket to form in the lump in the stock mounting bracket and prevent pulling out the structure in the raft foundation.
The invention has the beneficial effects that:
1. the installation measures are simple, the equipment investment is less, and part of the measures can be recycled to save the cost. Each steel upright column is taken as a unit to design an anchor rod mounting frame, the anchor rod mounting frame pre-fixes (non-welded) a plurality of high-strength anchor rods in the sleeve frame, and the anchor rod mounting frame is used as an assembly module to carry out integral hoisting and mounting, and the sleeve frame is welded with the embedded part, so that the rough positioning of the high-strength anchor rods can be realized; meanwhile, due to the protection of the anchor rod mounting frame, the high-strength anchor rod is not easy to be damaged by collision during cross construction on a construction site, and technical support is provided for qualified acceptance of the high-strength anchor rod.
2. And the accurate positioning of the high-strength anchor rod is realized through repeated measurement and monitoring. During the binding of the reinforcing steel bars and the pouring of concrete, monitoring and retesting each anchor rod by using a total station so as to realize accurate correction and positioning of the anchor rods; the anti-pulling effect of the later steel upright post is ensured.
3. The spherical nut is designed at the stretching end of the high-strength anchor rod, the spherical nut can adjust and eliminate the small deviation of the installation angle of part of the anchor rod, the anti-pulling effect of the steel upright post is improved, and meanwhile, all fittings with different angles can be standardized.
The novel and advantageous features of the present technology are further described and understood below with reference to specific embodiments.
Drawings
Fig. 1 is a schematic structural view of the steel upright post of the invention after being fixed.
Fig. 2 is a schematic diagram of the adjustment of the spherical nut according to the present invention.
Fig. 3 is a front elevation view of the anchor mount.
Fig. 4 is a side elevational view of the anchor mount.
Fig. 5 is a plan view of the upper steel plate in the anchor mount.
Fig. 6 is a plan view of the lower steel plate in the anchor mount.
Fig. 7 is a mounting diagram (front elevation, single) of the high-strength anchor rod in the anchor rod mounting frame.
Fig. 8 is a mounting diagram (side elevation, single) of the high-strength anchor rod in the anchor rod mounting frame.
Fig. 9 is a partially cut away view of the anchor mount (face up).
Fig. 10 is a schematic view (side elevational view) of the anchor mount with the upper portion partially cut away.
Fig. 11 is an installation view of the anchor rod installation frame, the high-strength anchor rod assembly and the auxiliary installation frame in the raft plate foundation groove in the construction process.
Fig. 12 is a schematic view of the connection between the anchor mount and the auxiliary mount.
FIG. 13 is a diagram of the mounting nodes of the steel stud of the present invention.
In the figure:
100 high-strength anchor rod components, 110 anchor rod bodies, 111 anchor end plates, 120 protective guide pipes, 121 annular spaces, 122 expanding parts, 130 grouting pipes, 140 locking nuts, 150 asbestos gaskets, 160 wedge gaskets, 161 grout-overflowing holes, 170 gaskets, 180 hexagonal nuts, 190 spherical nuts, 191 spherical matching,
200 anchor mounts, 210 upper steel plates, 220 lower steel plates, 230 anchor penetrations,
300 auxiliary supporting frames, 310 connecting pieces shaped like Chinese character 'ji',
the length of the 400 embedments, the 400' embedments,
500 reinforcing cages, 510 raft foundations,
600 steel upright posts, 610 bottom plates, 620 sealant, 630 overflow spaces and 640 leveling filling layers.
Detailed Description
In a certain project built by the unit, a main building project is designed by the inclination of a tower and the appearance of a large cantilever structure, the outer frame steel upright column of the structure can generate large pulling force under the lateral force action of wind load, earthquake and the like, and the steel upright column has the possibility of tensile stress, and the maximum pulling force of each single steel upright column is 15524KN by measurement and calculation.
The installation angle of the high-strength anchor rod is consistent with that of the inclined steel upright, referring to fig. 1, the installation inclination angle α ranges from 4 ° to 6 °, and α =5 ° is selected in this embodiment. The calculated embedding depth of the high-strength anchor rod in the raft foundation is between 1.0 meter and 3.0 meters, and the exposed size of the high-strength anchor rod is 0.5 meter, so that the high-strength anchor rod is used for connecting a steel upright column and realizing the stable and reliable installation of a steel upright column base.
In the embodiment, the M50-specification high-strength prestressed anchor rod group is adopted for the column base and the raftThe foundations are mechanically connected to resist the pulling force, the best arrangement is selected in the implementation, and the inclination angles of the anchor rods in the anchor rod group and the steel upright columns are designed to be consistent. The longest length of the designed anchor rod is 3500mm, the anchor rod is arranged in a bidirectional inclined way by 5 degrees, and the number of the anchor rods is 10. The tensile ultimate strength of a single anchor rod is 830N/mm 2 The yield strength is 535N/mm 2 Fig. 1 is a schematic view of the assembly of the high-strength anchor rod in the embodiment.
During construction, the high-strength anchor rods are tightly connected with the raft foundation, the lowest ends of the high-strength anchor rods are buried to the surface of the stressed steel bars at the bottom of the raft foundation, the upper structure and the raft foundation are cast and connected into a whole, and the pulling force of the steel column base is borne, referring to fig. 13. The large part of the high-strength anchor rod is poured in a raft foundation, and a reinforcement cage is bound in the raft foundation.
The traditional high-strength anchor rod component is composed of an anchor rod, gaskets at two ends, nuts and the like. The embodiment is installed by adopting a prestress installation method, wherein the upper end and the lower end of the anchor rod body are provided with thread sections for installing nuts, and the nuts are divided into spherical nuts and conventional hexagonal nuts.
The anchor rod body is manufactured by hot rolling and molding a carbon-chromium alloy material, and the related parameters of the anchor rod body are as follows:
in the embodiment, the high-strength anchor rod assembly 100 is taken as a configuration unit and described in detail, a core component of the assembly is an anchor rod body 110, which is referred to as an anchor rod or a rod body for convenience of description, and according to the operation specification, the anchor rod body 110 is hot-rolled and formed, and cannot be welded, so that the rod body is prevented from being damaged. The anchor rod comprises a protective guide pipe 120, a grouting pipe 130, a locking nut 140, an asbestos pad 150, a wedge-shaped pad 160, a washer 170, a hexagonal nut 180, a spherical nut 190 and other parts as matching parts, and further comprises a mechanical part, namely an anchor end plate 111. Wherein, protection pipe 120 is seamless thin wall steel pipe, straight tube, and this protection pipe 120 upper end is uncovered, and the lower extreme welds the anchor end plate, and the protection pipe sets up in the slope of stock mounting bracket. The anchor end plate 111 is a circular or square steel plate. The protection pipe 120 is a steel pipe, has the advantage of being convenient for to weld, and the anchor rod body and the anchor rod mounting bracket are directly welded by the welded fastening of the protection pipe and the anchor rod mounting bracket, so that the defect that the anchor rod body cannot be directly welded is overcome. The inner diameter of the protection conduit 120 is phi 80mm and is far larger than the diameter of the anchor rod, an annular space 121 is formed between the anchor rod and the protection conduit after installation, the annular space acts as two, one annular space is used as a deformation space of the anchor rod when the tensile stress of the anchor rod is applied, the other annular space is a cavity for grouting operation after the tensile stress is applied, state protection of the anchor rod is realized through grouting operation, air is expelled, and grouting material encapsulation is realized. The lower end of the protective conduit has an enlarged portion 122, the inner diameter of the enlarged portion is phi 100mm, the effective length of the enlarged portion is 100mm, and the enlarged inner cavity of the enlarged portion is used for meeting the installation requirement of the locking nut 140. The locking nut 140 is installed on a thread section at the lower end of the anchor rod body in a thread fit mode, the anchoring end plate is located from the upper side, the lower side of the anchoring end plate is fixed through the asbestos base plate 150 and the hexagonal nut, and the anchoring end plate 111 is fixed at the lower end of the rod body under the common clamping and clamping effects of the locking nut 140 and the hexagonal nut 180 at the upper side and the lower side.
In this embodiment, the anchoring end plate 111 is provided with a through hole for engaging with the anchor rod. The anchoring end plate 111 is welded to the enlarged pipe opening at the lower end of the protection conduit 120, and a complete sealing weld is formed between the two, that is, the protection conduit and the anchor rod body are kept in a relatively fixed position by the anchoring end plate.
Other mechanical connection means, such as a threaded connection, between the anchoring end plate 111 and the protection conduit can be used to ensure the connection strength, and are within the scope of the present technology.
The lowermost end of the anchor rod body, i.e., the lower end thread section, is inserted into the through hole of the lower steel plate of the anchor rod mounting bracket 200, and the anchor rod body is placed under the action of gravity, so that the axial upward positioning of the anchor rod is realized.
As described above, the lower end of the grout pipe 130 is welded to the enlarged portion 122 of the protection tube, and is partially bent at a connection point to allow the grout pipe to pass therethrough, and also to provide a path for grouting and filling after the anchor is prestressed. The upper port of the grouting pipe 130 should extend to a position of at least 50 cm above the raft foundation to be poured, and is protected from blockage, so that grouting operation can be smoothly performed.
In the stage of steel column installation and construction, referring to fig. 1 and 2, the upper end of the screw rod body is screwed from bottom to top by the spherical nut 190, so that the anchor rod body 110 is directly and mechanically connected with the steel column base bottom plate 610.
In the construction stage of concrete pouring, the upper surface of the spherical nut and the upper steel plate of the anchor rod mounting frame can be reversely pressed to apply upward reverse force, the screw rod piece is axially locked at the upper end, and the anchor rod piece can be further prevented from shaking by matching with the locking at the lower end of the screw rod piece. In the structure, the spherical nut is positioned at the lower side of the upper steel plate and is tightly jacked from bottom to top. Like this, go up the steel sheet and lock the stock body of rod from the upper end, the anchor backing plate is from the locking of stock body of rod lower extreme, realizes the preliminary location and the locking of single stock that excels in, and this process is accomplished in the workshop of mill, and the assembly precision is high, and assembly effect is good.
The wedge-shaped base plate is used for mounting the steel upright post in the subsequent process and is described in detail in a specific construction method.
The high-strength anchor rod adopted in the project requires high embedding precision and reliable connection with a main steel structure.
In construction, the accurate positioning and installation accuracy of the high-strength anchor rod should be fully ensured. If the mode that adopts direct high strength stock and reinforcement cage ligature is fixed, can not satisfy the required precision, and at the in-process of pouring concrete, the position of stock can change. Therefore, the direct installation of the high-strength anchor rod has a difficult problem, and the installation precision and efficiency can not meet the technical requirements.
Based on the problem, the embodiment proposes the following construction solution:
the technical measures comprise the manufacture of an anchor rod mounting frame, the embedding and positioning, the application of a spherical nut and the provision of a complete set of construction technology.
Manufacturing an anchor rod mounting frame: and (3) sampling parameters such as accurate positions, inclination angles and the like of all high-strength anchor rods in each steel upright mounting node in a computer by adopting a CAD (computer aided design) technology, designing a complete set of drawings of the anchor rod mounting frame and the auxiliary support frame by taking each steel upright as a unit by utilizing a computer aided design technology, and manufacturing according to the drawings. Specifically, the anchor rod mounting bracket 200 is formed in a three-dimensional structure by welding vertically, horizontally, longitudinally and obliquely using angle steel as a raw material, referring to the rectangular frame structure shown in fig. 3 and 4, an upper layer, a middle layer and a lower layer are provided due to a large span, and an upper layer and a lower layer of steel plates are provided in the anchor rod mounting bracket, fig. 5 is a plan view of an upper steel plate 210, and fig. 6 is a plan view of a lower steel plate 220. The laser-cut anchor rod through holes 230 in the two steel plates are used as fixing points of the anchor rod, the steel plates are Q235 or Q345, and the thickness of the steel plates is preferably 20 mm or 30 mm thick steel plates. As can be seen from fig. 5 and 6, the anchor rod through holes 230 formed in the upper and lower steel plates are formed by laser cutting, and are arranged to be offset from each other, so that the high-strength anchor rod can have a design angle of 5 degrees by respectively penetrating both ends of each anchor rod into the corresponding anchor rod through holes in the two steel plates.
That is, the line between the fixing points formed by the two bolt through holes 230 on the steel plate is the spatial angular configuration of the bolt, and fig. 7 and 8 are schematic views of the high-strength prestressed bolt-mounting bracket.
Still include auxiliary stay frame 300, similar with the stock mounting bracket, this auxiliary stay frame adopts the angle steel welded support with the specification, and this auxiliary stay frame is used for carrying out supplementary support to the stock mounting bracket. The auxiliary supporting frame 300 is a table-shaped structure composed of four inclined struts inclined outwards and two square frames, and the section is a trapezoid profile with a small upper part and a large lower part. This auxiliary stay frame cover is in the periphery of stock mounting bracket to set up several font connecting pieces 310 between the two and connect, several font sheet metal construction are bent into to the preferred steel sheet of several font connecting pieces, and the billet forms semi-rigid connection, blocks vibrations transmission route.
The bottom of the auxiliary supporting frame 300 is fixedly connected with the embedded part 400 through welding, wherein the embedded part is an embedded metal part located in the bottom foundation of the raft foundation.
The bottom of the anchor rod mounting frame 200 is also fixedly connected with an embedded part 400' through welding, wherein the embedded part is an embedded metal part located in the bottom foundation of the raft foundation.
In the implementation, the structure of the anchor rod mounting frame and the auxiliary supporting frame is simple, materials are convenient to purchase, the site processing is convenient to transport, and the assembly type construction can be carried out immediately, so that the construction period is shortened. The anchor rod mounting frame and the auxiliary supporting frame are all welded and connected in machining, so that implementation cost is reduced.
The tying of the reinforcement bars in the raft bed around the anchor mounts 200 to form reinforcement cages 500, as shown in fig. 12, is performed without direct, rigid connection between the reinforcement cages and the anchor mounts, interfering with each other. And adopt the total powerstation to carry out location monitoring to every high-strength anchor pole to before concrete placement to every anchor pole location retest, strike the mode at stock top through the copper hammer, finely tune, in order to realize the accurate positioning of stock, figure 7 and figure 8 are high-strength prestressing force stock mounting bracket and stock assembly sketch before hoist and mount.
When concrete pouring is carried out on the raft foundation pit slot, the total station is adopted to carry out positioning monitoring on each high-strength anchor rod so as to observe whether the position of the anchor rod changes or not, and if so, the anchor rod is timely adjusted.
After concrete pouring in the raft foundation pit slot is completed and cured and hardened, a raft foundation 510 of a reinforced concrete structure is formed, a cutting machine is used for cutting the part above the concrete surface of the high-strength anchor rod mounting frame (or cutting the part to the elevation delta 0 at the bottom of the steel upright post), the cut part is removed, the position of each high-strength anchor rod is retested after the removal, and as the arrangement, the interval and the precision of 10 high-strength anchor rods are completely consistent with the design, the steel upright post is finally installed, and fig. 9 and 10 are schematic diagrams of the high-strength pre-stressed high-strength anchor rod mounting frame before steel structure hoisting after cutting.
Referring to fig. 1 and 13, a bottom plate 610 of the steel upright 600 is made of a 135 mm thick steel plate, and the bottom plate 610 of the steel upright 600 is provided with a through hole for allowing a high-strength and high-strength anchor rod to pass through, and is also a mounting hole. The perforation is a plurality of, and every high strength Gao Jiangmao pole corresponds one, and in this embodiment node, every steel column 600 corresponds ten mounting holes. Particularly, the upper end of the high-strength anchor rod is anchored by adopting a spherical nut, a wedge-shaped cushion block is arranged between the spherical nut and the steel column bottom plate for solving the problem of installation deviation between the spherical nut and the steel column bottom plate, particularly, a 5-degree included angle is formed between the upper end surface and the lower end surface of the wedge-shaped cushion block, and a rough surface is kept between the wedge-shaped cushion block and the steel column bottom plate, for example, surface embossing measures are adopted to prevent relative sliding between the wedge-shaped cushion block and the steel column bottom plate. The wedge-shaped cushion block and the spherical nut are in a spherical matching surface, the installation of the anchor rod with a certain inclination angle can be adapted, all accessories are standardized, the implementation cost is reduced, and fig. 5 is a large sample diagram of the installation end part of the spherical nut.
Meanwhile, the wedge-shaped spacer 160 has a grout outlet 161 which extends through the wedge-shaped spacer in the vertical direction, so that the grouting mortar in the protection conduit can overflow from the bottom to the top, and finally the grouting mortar fills the inner space of the sleeve.
In the structure, if the high-strength anchor rod has installation deviation on an inclined angle, the spherical nut can be adjusted before the grouting step, and the installation deviation is eliminated through rotation between the spherical nut and the wedge-shaped cushion block; this can be easily achieved.
But the angle regulation size of high strength stock can be confirmed according to factors such as the thickness of stock diameter, wedge backing plate middle spherical hole, steel stand bottom plate installation round hole diameter and each accessory, for example the spherical hole diameter in the middle of the wedge backing plate is obviously greater than the diameter of high strength stock to have abundant adjustment space, as shown in following figure 6, with spherical nut sphere center as the turning point, angle regulation theta scope does: 0.5< theta < +0.5 (negative when clockwise rotation is assumed, i.e. negative value of a), and fig. 2 is a graph of the angular inclination deviation of the adjustable anchor rod of the spherical nut.
Referring to fig. 1, the upper end of the protection conduit is inserted into the mounting circular hole of the steel column bottom plate 610, the insertion depth is one third of the thickness of the steel column bottom plate, that is, one third of the depth of the mounting circular hole, and a sealant 620 is filled between the pipe orifice of the protection conduit and the inner wall of the mounting circular hole, so as to fix the upper end of the protection conduit. The installation hole forms therein an overflow space 630 for grouting slurry.
The flow path of the grouting slurry is as follows: grouting pipe (from top to bottom), protective conduit (from bottom to top), mounting round hole (bottom plate), overflow hole (wedge-shaped backing plate), and casing inner cavity.
A construction method of a high-strength prestressed anchor rod in a steel structure foundation,
the method comprises the steps of firstly, sampling the accurate positions of all high-strength anchor rods in each steel upright post mounting node in a computer by adopting a CAD technology, designing a complete drawing of an anchor rod mounting frame and an auxiliary support frame by taking each steel upright post as a unit by utilizing a computer-aided design technology, forming a three-dimensional structure by adopting angle steel through vertical, horizontal, longitudinal and oblique welding, arranging an upper layer of steel plate and a lower layer of steel plate in the anchor rod mounting frame, taking a laser-cut anchor rod hole in each steel plate as a fixing point of each anchor rod, adopting Q235 or Q345 as each steel plate, and preferably adopting a thick steel plate of 20 mm or 30 mm in thickness. And the laser cutting anchor rod holes in the upper and lower layers of steel plates are arranged in a staggered manner, and two ends of each anchor rod are respectively penetrated into the corresponding anchor rod holes in the two steel plates.
The anchor rod mounting frame and the auxiliary supporting frame are manufactured in a steel structure manufacturing workshop, and the high-strength anchor rod assembly is preassembled in the anchor rod mounting frame in a processing workshop, so that the cross operation of construction site operation and other projects is reduced, the safety risk is reduced, the operation speed is high, and the cost can be reduced.
In a workshop, the assembly of the high-strength anchor rod component in the anchor rod mounting frame comprises the following specific steps:
sub-step 1, installing phi 88 x 2 anchor rod protection guide pipes (the lower ends of the protection guide pipes are provided with amplification heads, the size of the protection guide pipes is phi 102 x 2), the upper ends of the protection guide pipes slightly extend out of the upper surface of the sleeve frame, the protection guide pipes and the anchor rod installation frame are arranged at an angle alpha (alpha is 5 degrees in the embodiment) and are welded and fixed, the upper ends and the lower ends of the protection guide pipes respectively correspond to anchor rod through holes in the upper steel plate and the lower steel plate, and the protection guide pipes are inclined by 5 degrees; the anchor rod is installed by a truss crane and inserted into the protection conduit, and the hoisting point is set in a way that a temporary nut is installed at one end of the anchor rod and a lifting lug is welded on the temporary nut (it needs to be explained that the anchor rod is high-strength steel, any part cannot be welded on the anchor rod, and in the embodiment, the welding point is arranged on the temporary nut, so that the principle is not violated); meanwhile, a locking nut, an anchoring end plate, an asbestos pad plate, a gasket and a hexagonal nut are sequentially arranged in a lower-end threaded section of the anchor rod from bottom to top, the anchoring end plate is fixed on the lower section of the rod body by using the hexagonal nut, and then a hook is lifted and loosened by referring to fig. 7 and 8; and finally, removing the temporary hoisting nut, installing a spherical nut, and locking the spherical nut and the upper steel plate to realize primary positioning of the upper end of the anchor rod so as to complete installation of one anchor rod. All the anchor rods in the anchor rod mounting frame are completed one by one according to the sequence.
And a substep 2, installing a grouting pipe phi 20 x 2, and welding the grouting pipe phi 20 x 2 with the protective guide pipe, wherein a grouting hole is arranged on the protective guide pipe at the corresponding welding point position, and the grouting hole is penetrated and corresponds to the grouting pipe. The grouting pipe extends upwards in an inclined way and goes out of the elevation point of the raft foundation. In order to facilitate grouting, an included angle is formed between the grouting pipe and the protective guide pipe.
And 3, repeating the substep 1 and the substep 2, and finishing the installation of all the high-strength anchor rod assemblies 100.
Step 4, marking steel column control points (namely steel column positioning axis control points) on the upper surface of the sleeve frame, correcting the positioning size and the inclination angle of each anchor rod, and then fastening a spherical nut and a hexagonal nut to enable the high-strength anchor rod, the anchoring end plate and the protective conduit grouting pipe to form a whole; re-measuring the anchor rod, adjusting the included angle value of the anchor rod to be a design angle in a knocking mode, and then welding the protective conduit and the anchoring end plate in a surrounding manner; and finally, welding the anchoring end plate and the lower steel plate of the sleeve frame again to complete accurate positioning, and ensuring the installation strength of the screw rod body through a plurality of welding spots.
Secondly, hoisting and installing the anchor rod installation frame:
1. installing an embedded part: in the construction stage of the waterproof bedding of the raft, the accurate position of each embedded part of the jacket frame is measured according to the peripheral axis control point and the elevation control point, and the embedded parts are installed; to higher and heavier high-strength anchor rod mounting bracket, should increase auxiliary stay built-in fitting to guarantee anchor rod mounting bracket's pre-fix intensity, do not rock, it is firm. And after the cushion concrete is finished, retesting the positioning of the embedded part to ensure the precision.
2. Burying a high-strength anchor rod system: before the raft bottom ribs are bound, the embedding work of the prestressed high-strength anchor rod support sleeve frame is started. Hoisting the high-strength anchor rod mounting frame in place by using a civil engineering tower crane, and welding angle steel supporting legs of the anchor rod mounting frame with embedded parts in the cushion layer after the anchor rod mounting frame is positioned and corrected; in order to prevent raft board concrete pouring and reinforcement from producing displacement and deformation to the stock, add in stock mounting bracket periphery and establish the auxiliary stay mounting bracket to the rigidity of reinforcing stock mounting bracket, add a few font connecting plates in the middle part between two mounting brackets simultaneously, form horizontal support, and a few font connecting plates have the characteristics of semi-rigidity, have the good effect of shock attenuation and vibration isolation, refer to fig. 11 and fig. 12.
Binding a reinforcement cage, accurately positioning and retesting before concrete pouring, positioning and monitoring the anchor rod mounting rack by using a total station in the reinforcement binding process, and avoiding directly laying the reinforcement on a sleeve frame to prevent the anchor rod mounting rack from integrally collapsing or deforming when the reinforcement is bound on site; after the steel bars are bound and before the raft concrete is poured, the prestressed anchor rods are subjected to final retest by using a total station, the positions and the elevations of the prestressed anchor rods are corrected, and the next concrete pouring procedure is carried out; the high-strength anchor rod has the installation characteristics of large diameter, long size, heavier single, unequal quantity of each steel upright column and certain inclination angle, the accurate high-precision positioning of the anchor rod is required to be met, the stability of the mounting frame and the support frame is required to be ensured, and deformation and movement are required to be prevented during raft steel bar binding and concrete pouring.
And step four, protective measures and positioning monitoring during concrete pouring: before concrete pouring, grease is coated on the upper end threads of the anchor rod, plastic paper is coated on the upper end threads of the anchor rod, and a plastic pipe is sleeved on the upper end threads of the anchor rod; and the upper port of the grouting pipe is completely closed by gummed paper and extends out of the top surface of the concrete pouring by 400mm. In the concrete pouring process, a specially-assigned person is dispatched to monitor the concrete, and the vibration rod is prevented from contacting the anchor rod or being too close to the anchor rod, so that the positioning precision is not influenced; and meanwhile, when concrete is poured, the total station is adopted to monitor the position of the anchor rod around the foundation pit, and the influence of the concrete pouring on the positioning of the high-strength anchor rod is controlled in the whole process.
Fifthly, processing the anchor rod mounting frame: after concrete pouring is completed, the parts above the concrete surface of the anchor rod mounting frame (or the parts are cut to the height of the bottom of the steel upright post), referring to fig. 9 and 10, the parts in the raft foundation are reserved, the positions of the high-strength anchor rods are retested, and finally the main body steel upright post is mounted.
The high-strength prestressed anchor rod must not be welded at the construction site, and the thread of the anchor rod is well protected during cross operation and cutting of the anchor rod mounting rack.
Sixthly, mounting the steel upright posts: removing the spherical bolt at the upper end of the high-strength anchor rod, smearing sealant outside the exposed protective guide pipe, aligning the mounting round hole in the bottom plate of the steel column base with the high-strength anchor rod and mounting the anchor rod on a raft foundation, leveling the bottom plate of the steel column base to reach a designed elevation, grouting in the space below the bottom plate of the steel column base, and curing until hardening to form a leveling filling layer 640. The leveling filling layer is made of concrete mortar and is filled in the space between the raft foundation and the bottom plate of the column base of the steel column, and the leveling filling layer has positive significance on the installation precision of the bottom plate. Sequentially sleeving a wedge-shaped base plate and a spherical nut on the high-strength anchor rod, wherein the spherical nut is in spherical fit with a spherical positioning hole in the wedge-shaped base plate 191, preliminarily pre-tightening the spherical nut, and eliminating the installation angle deviation of the high-strength anchor rod by adjusting the angle of the spherical nut in the preliminary pre-tightening process; after the high-strength anchor rods around the steel upright post are preliminarily pre-tightened, a hydraulic tensioning tool is used for carrying out prestress tensioning on the upper ends of the high-strength anchor rods, spherical nuts are fastened, the tensioning sequence adopts the opposite side fastening principle to be tensioned one by one, and finally grouting is carried out from a grouting pipe to the inside of a protection conduit through grouting equipment until continuous grout overflows from an overflow hole in an anchoring base plate, so that all grouting is completed one by one and the maintenance is qualified.
In the sixth step, referring to fig. 2, after the installation of the steel upright is completed, the spherical nut is installed and the installation angle deviation of the high-strength anchor rod is digested, the high-strength anchor rod is fastened after being subjected to prestress tensioning, and finally high-strength anchor rod grouting is performed.
The construction advantages of the embodiment at least include the following:
1. generally, a common anchor rod is a non-stressed anchor rod of a positioning anchor rod, is not high in material grade, and can be welded and fixed during field installation. In this embodiment, the high-strength anchor rod is used, the high-strength anchor rod is characterized by high strength and brittleness, field welding cannot be performed according to the use specification of the high-strength screw rod, in this embodiment, the high-strength anchor rod and the anchor rod mounting frame are required to be indirectly fixed through the protection conduit and the anchoring end plate, multiple welding positions exist among the protection conduit, the anchoring end plate and the anchoring mounting frame, and the mounting firmness is guaranteed.
2. According to the traditional method, after the anchor rod is welded, the position of the anchor rod is difficult to adjust, in the construction and installation method, the upper end of the anchor rod body is connected in a non-welding mode, the anchor rod body is completely fixed with the anchoring end plate at the lower end, a certain adjusting space is formed between the anchor rod body and the protection guide pipe, the installation error can be finely adjusted through the action of the spherical bolt, and the installation accuracy of the upper end of the anchor rod can be adjusted.
3. The anchor rod stretch-draw end adopts the spherical nut, can adapt to the installation of different inclination anchor rods, can make the accessory standardized, practices thrift the cost, can digest anchor rod installation error simultaneously, and the technique is comparatively advanced.
4. Traditional stock is whole to be buried underground, appears the inconvenient adjustment of installation error, can only demolish the reconstruction, and is with high costs.
5. According to the technology, most of preassembly work is completed in a workshop, and the assembly type construction can be adopted to improve the construction efficiency.
After the technology is implemented, the difficult problem of presetting of a plurality of prestressed high-strength anchor rods in a steel upright mounting point can be realized at one time, and the prestressed high-strength anchor rods are distributed at the steel upright. For example, conventionally, 8 to 12 anchor rods are required to be arranged on each steel upright, and the area and the number are large. Adopt the way of stock mounting bracket and stock simultaneous installation in this construction, with the whole preassemblies of the required stock of a steel stand in an organic whole, workshop preassembly, the job site only need adopt a small truck to hang and just can satisfy the hoist and mount requirement, has avoided the on-the-spot adoption tower crane to pursue the stock installation to reduce tower crane hoisting equipment's input, practiced thrift installation cost greatly.
The anchor rod stretch-draw end adopts the sphere nut can adapt to the angle of slope anchor rod, makes the accessory of all different angle anchor rods all process according to 5 degrees of slope, accomplishes the standardization, has practiced thrift accessory processing cost greatly, and economic benefits is very considerable.
Welding process in the stock mounting bracket workshop, and the stock is synchronous installation when processing is accomplished, then transports to the appointed place and hoists, and whole work can go on simultaneously with other processes, has reduced on-the-spot cross operation again, and construction cycle is the shortest.
The anchor rod stretching end adopts a spherical nut, can adapt to the inclined anchor rod angle within a certain range, and can digest part of installation angle errors. From the result of the finished engineering installation, 100 percent of steel upright post anchor rods are accurately embedded and positioned, and have no phenomenon of bottom plate chambering and no phenomenon of rework, and are rare in the domestic steel structure installation industry.
The anchor rod mounting frame is used for primary positioning during installation, and the anchor rod is welded and fixed to the embedded part of the raft foundation, so that the anchor rod is accurately positioned for the second time, the installation precision is improved, and the requirement of embedded precision can be met.
The embodiment is only based on the description of one effective attempt of the project, and should not limit the protection scope of the technology, and similar constructions should also fall into the protection scope of the invention.
Claims (5)
1. A construction method of a foundation for installing a steel structure column base of a building is characterized in that,
the method comprises the steps that firstly, the accurate positions and the inclination angles of all high-strength anchor rods in each steel upright post installation node are sampled in a computer, drawing drawings of an anchor rod installation frame and an auxiliary support frame by using each steel upright post as a unit module through computer-aided design is carried out, and the anchor rod installation frame and the auxiliary support frame are manufactured according to the drawings; mechanically connecting the anchor rod mounting frame with the auxiliary support frame, and installing a high-strength anchor rod component in the anchor rod mounting frame according to design requirements, wherein the high-strength anchor rod component consists of a high-strength anchor rod, a hexagon nut, a spherical nut, a protection conduit, a grouting pipe, a locking nut, an asbestos base plate and a gasket;
secondly, measuring the position of each embedded part of the anchor rod mounting rack according to a peripheral axis control point and an elevation control point in the construction stage of the waterproof cushion of the raft, pouring cushion concrete after the embedded parts are mounted, and curing the concrete until the concrete is hardened after the positions of the embedded parts are retested to be qualified; then, integrally hoisting the anchor rod mounting frame and the auxiliary support frame in place, welding the anchor rod mounting frame and the embedded part after the anchor rod mounting frame is positioned and corrected, welding the auxiliary support frame and the embedded part, and retesting the accurate position and the inclination angle of the high-strength anchor rod after the welding is finished;
binding a reinforcement cage in the raft foundation groove, monitoring the high-strength anchor rod by using a total station in the reinforcement binding process, and avoiding directly laying the reinforcement on the anchor rod mounting frame when binding the reinforcement on site; after the steel bars are bound and before concrete pouring, retesting the high-strength anchor rod by using a total station, correcting the position precision and the inclination angle of the high-strength anchor rod, and entering a concrete pouring process after the high-strength anchor rod is qualified;
fourthly, before concrete pouring, coating grease on the upper end threads of the high-strength anchor rod, wrapping plastic paper and sleeving a plastic pipe; the upper port of the grouting pipe extends out of the top surface of the concrete pouring and is completely sealed by adhesive tape, so that a vibration rod is prevented from contacting the high-strength anchor rod in the concrete pouring process, and the position precision and the inclination angle of the high-strength anchor rod are synchronously monitored by using a total station;
fifthly, after the concrete is hardened, cutting off the part of the anchor rod mounting frame exposed above the surface of the concrete, and retesting the position precision and the inclination angle of each high-strength anchor rod;
sixthly, mounting the steel upright posts: detaching a spherical bolt at the upper end of a high-strength anchor rod, smearing sealant outside an exposed protective guide pipe, aligning a mounting round hole in a bottom plate of a steel column base to the high-strength anchor rod and mounting the anchor rod on a raft foundation, leveling the bottom plate of the steel column base to reach a designed elevation, grouting in a space below the bottom plate of the steel column base and curing to be hardened, sequentially sleeving a wedge-shaped base plate and a spherical nut on the high-strength anchor rod, wherein the spherical nut is in spherical fit with a spherical positioning hole in the wedge-shaped base plate, preliminarily pre-tightening the spherical nut, and eliminating the mounting angle deviation of the high-strength anchor rod by adjusting the angle of the spherical nut in the preliminary pre-tightening process; after the high-strength anchor rods around the steel upright post are preliminarily pre-tightened, a hydraulic tensioning tool is used for carrying out prestress tensioning on the upper ends of the high-strength anchor rods, spherical nuts are fastened, the tensioning sequence adopts the opposite side fastening principle to be tensioned one by one, and finally grouting is carried out from a grouting pipe to the inside of a protection conduit through grouting equipment until continuous grout overflows from an overflow hole in an anchoring base plate, so that all grouting is completed one by one and the maintenance is qualified.
2. The construction method for the installation foundation of the constructional steel structure column base according to the claim 1, wherein in the first step, the assembly of the high-strength anchor rod component in the anchor rod mounting frame comprises the following specific steps:
the method comprises the following steps that 1, a protective guide pipe is arranged in an anchor rod mounting frame, the upper end of the protective guide pipe just extends out of the upper surface of a sleeve frame, the protective guide pipe and the anchor rod mounting frame are obliquely arranged at an angle alpha and are welded and fixed, and the upper end and the lower end of the protective guide pipe respectively correspond to anchor rod through holes in an upper steel plate and a lower steel plate of the anchor rod mounting frame; hoisting and inserting a high-strength anchor rod into the protection guide pipe from top to bottom, wherein hoisting points are set in a mode that a temporary nut is installed at the upper end of a rod body and a lifting lug is welded on the temporary nut, the upper end and the lower end of the high-strength anchor rod are respectively inserted into anchor rod through holes of an upper steel plate and a lower steel plate, after the high-strength anchor rod is installed in place, a locking nut, an anchoring end plate, an asbestos base plate, a gasket and a hexagon nut are sequentially installed in a lower end thread section from bottom to top, the anchoring end plate is fixed by the hexagon nut, then the hook is lifted and loosened, the temporary nut is removed, a spherical nut is installed, primary positioning of the upper end of the anchor rod is realized through locking between the spherical nut and the upper steel plate, and installation of the high-strength anchor rod assembly is completed;
installing a grouting pipe, welding and connecting the grouting pipe and a protective guide pipe to form a grouting channel, wherein the grouting pipe extends upwards in an inclined mode and is led out of the elevation point of the raft foundation;
substep 3, repeating substep 1 and substep 2, and finishing the installation of all high-strength anchor rod components;
step 4, marking steel column control points on a steel plate on the anchor rod mounting frame, correcting the positioning size and the inclination angle of each high-strength anchor rod, then respectively fastening a spherical nut and a hexagonal nut again, and then welding the protective conduit and the anchoring end plate in a surrounding manner; finally, the anchoring end plate is welded with the lower steel plate of the sleeve frame;
and a substep 5, mechanically connecting the auxiliary support frame and the anchor rod mounting frame by using a connecting plate in a shape of Chinese character 'ji'.
3. The construction method of the installation foundation of the column foot of the building steel structure according to claim 1, wherein installation positions of embedded parts in the raft waterproof cushion layer are designed to be deepened.
4. A building steel structure column base installation node comprises a raft foundation, an anchor rod installation frame, high-strength anchor rod components, a wedge-shaped base plate and steel columns, wherein a plurality of high-strength anchor bolt components are fixed in the anchor rod installation frame, the anchor rod installation frame and the high-strength anchor bolt components are installed in the raft foundation,
the high-strength anchor rod component consists of a high-strength anchor rod, a hexagonal nut, a spherical nut, a protective guide pipe, a grouting pipe, a locking nut, an asbestos base plate and a gasket; the lower end screw thread section of the high-strength anchor rod is sequentially provided with a locking nut, an anchoring end plate, an asbestos base plate, a gasket and a hexagon nut from bottom to top, the anchoring end plate is welded with a protection conduit, the lower end of the protection conduit is welded with a grouting pipe, and the upper end of the protection conduit is connected with a mounting hole in a steel column base bottom plate; the upper end of the high-strength screw rod is sequentially provided with a wedge-shaped base plate and a spherical nut from top to bottom, and the spherical nut is in spherical fit with a spherical positioning hole in the wedge-shaped base plate; the high-strength anchor rod is in a prestressed tensioning state, and grouting filler is arranged between the high-strength anchor rod and the protection conduit; the protection conduit and the anchoring end plate are respectively welded with the anchor rod mounting frame, and the high-strength anchor rod and the vertical direction form an alpha included angle; the raft foundation is of a steel-concrete structure, and an internal reinforcement cage is not in contact with the anchor rod mounting rack.
5. The building steel structure column base installation node of claim 4, further comprising an auxiliary support frame, wherein the auxiliary support frame is located on the periphery of the anchor rod installation frame, and forms an anti-pulling structure in the raft foundation together with the anchor rod installation frame.
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