Upper and lower closed positioning device for centering embedded parts of steel structure and construction method

Abstract

The present invention relates to an upper and lower closed positioning device for centering steel structure embedded parts, comprising an upper buckle ring and a lower buckle ring, a laser indicator is arranged at the center of the upper buckle ring, the laser beam emitted by the laser indicator corresponds to the center position of the upper buckle ring and is perpendicular to the upper buckle ring, and the upper buckle ring is provided with a first bubble level and a second bubble level arranged perpendicular to each other; during installation, the upper buckle ring is buckled on the top edge of the steel structure embedded part, and the lower buckle ring is buckled on the bottom edge of the steel structure embedded part, and a first buckle member for connecting and fixing the two is arranged between the upper buckle ring and the lower buckle ring; the lower buckle ring comprises two symmetrical half buckles, and a second buckle member for connecting and fixing the two is arranged between the two half buckles. The present invention solves the problem that the existing embedded parts centering and leveling efficiency is low and the accuracy is not high enough.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to an upper and lower closed positioning device for centering embedded parts of a steel structure and a construction method. Background Art

[0002] Embedded parts (prefabricated embedded parts) are components pre-installed (buried) in concealed projects. They are components placed during the pouring of the structure and used for lap joints when building the superstructure. Some embedded parts used on piles, columns or caps are Figure 1 The shapes of these embedded parts correspond to the piles or columns, which are generally round or square, and a through hole is provided in the center of the embedded parts for vibrating the concrete inside the piles or columns.

[0003] However, when setting these embedded parts, it is necessary to keep the embedded parts horizontal, and the through holes on the embedded parts should correspond to the center of the pile or column, so it is necessary to perform centering and leveling when setting the embedded parts; Figure 2 The existing practice is to first build a steel cage of a pile or column, and draw a cross mark at the center of the bottom of the steel cage to mark the center; then the worker moves the embedded parts to the top of the steel cage, and puts the bubble level on the embedded parts for leveling. During the leveling process, the position of the bubble level needs to be changed several times to ensure that the embedded parts are level; at the same time, the worker uses a thin rope to hang heavy objects for centering; finally, the worker fixes the embedded parts to the steel cage. The existing practice, on the one hand, is inefficient in centering and leveling, takes a very long time, and the accuracy of centering and leveling is not high enough; on the other hand, when the worker fixes the embedded parts to the steel cage, the position of the embedded parts will be offset, resulting in the inaccurate position of the embedded parts after they are fixed. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide an upper and lower closed positioning device and a construction method for centering embedded parts of steel structures, which can solve the problems of low efficiency and insufficient accuracy in centering and leveling of existing embedded parts.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A closed upper and lower positioning device for centering steel structure embedded parts, comprising an upper buckle ring and a lower buckle ring, a laser indicator is arranged at the center of the upper buckle ring, the laser beam emitted by the laser indicator corresponds to the center position of the upper buckle ring and is perpendicular to the upper buckle ring, and a first bubble level and a second bubble level arranged perpendicular to each other are arranged on the upper buckle ring; during installation, the upper buckle ring is buckled to the top edge of the steel structure embedded part, and the lower buckle ring is buckled to the bottom edge of the steel structure embedded part, and a first buckle member for connecting and fixing the two is arranged between the upper buckle ring and the lower buckle ring; the lower buckle ring comprises two symmetrical half buckles, and a second buckle member for connecting and fixing the two is arranged between the two half buckles.

[0007] In the above scheme, the upper buckle ring and the lower buckle ring are both annular angle steel structures. After installation, the upper buckle ring wraps the top edge of the steel structure embedded part and the upper part of the side wall of the steel structure embedded part; the lower buckle ring wraps the bottom edge of the steel structure embedded part and the lower part of the side wall of the steel structure embedded part.

[0008] In the above solution, after the two half buckles are spliced ​​to form the lower buckle, two connecting ends are formed between the two, one of which is hinged by the second hinge, and the other is connected and fixed by the second buckle.

[0009] In the above solution, a first hinge is provided between the upper buckle ring and one of the half buckle rings for hingedly connecting the two.

[0010] In the above scheme, the first fastener includes a fixed buckle and a movable buckle, a plurality of the fixed buckles are circumferentially arranged on the lower buckle ring, and a plurality of the movable buckles are circumferentially arranged on the upper buckle ring, and the fixed buckle and the movable buckle are correspondingly arranged; the movable buckle includes a bracket, a handle and a U-shaped lock, the bracket is fixed on the upper buckle ring, the handle is hinged to the bracket, and the U-shaped lock is hinged to the handle, and the U-shaped lock can be fastened or detached from the fixed buckle by rotating the handle.

[0011] In the above scheme, the fixed buckle is fixed to the lower surface of the lower buckle ring, and the movable buckle is fixed to the upper surface of the upper buckle ring; the U-shaped lock buckle includes two bent portions bent to the side, and the U-shaped lock buckle is "C-shaped" when viewed from the side, so that the upper end of the U-shaped lock buckle is hinged to the handle, and the lower end is wrapped around the bottom of the lower buckle ring and buckled with the fixed buckle.

[0012] In the above solution, the second fastener has the same main structure as the first fastener, including a fixed buckle and a movable buckle, but the difference is that the U-shaped lock of the second fastener does not include the bent portion of the first fastener.

[0013] The construction method for centering a steel structure embedded part using any of the above-mentioned upper and lower closed positioning devices for centering a steel structure embedded part comprises the following steps:

[0014] Step 1: Install the steel structure embedded parts on the positioning device;

[0015] Step 2: mark the center with a cross mark on the bottom of the steel cage, move the positioning device and the embedded steel structure parts onto the steel cage as a whole, center them with the laser beam emitted by the laser pointer, and level them with the first bubble level and the second bubble level;

[0016] Step 3: After the centering and leveling are completed, the steel cage is welded and fixed to the steel structure embedded parts while the position of the steel structure embedded parts is maintained, so that the position of the steel structure embedded parts is fixed;

[0017] Step 4: remove the positioning device from the steel structure embedded part.

[0018] In the above method, the first buckle and the second buckle on the positioning device are first opened so that the first buckle and the second buckle do not block the steel structure embedded part, the unfolded lower buckle ring is fastened to the bottom of the steel structure embedded part, and the lower buckle ring is locked by the second buckle; then the upper buckle ring is fastened to the top of the steel structure embedded part, and the upper buckle ring and the lower buckle ring are fastened by the first buckle, so that the steel structure embedded part is fixed between the upper buckle and the lower buckle and cannot fall out.

[0019] In the above method, a steel bar is first welded to the bottom of the steel structure embedded part, and then the steel structure embedded part is installed on the positioning device; when the positioning device and the steel structure embedded part are moved as a whole onto the steel cage, the steel bar is inserted into the steel cage; after the centering and leveling of the steel structure embedded part is completed, the steel bar and the steel cage are fixed by bundling and / or welding while maintaining the position of the steel structure embedded part.

[0020] The present invention has the following beneficial effects: using the positioning device, centering and leveling can be performed simultaneously, and the leveling process is completed in one step without the need to change the position measurement multiple times as in the past; the centering process only requires observing whether the laser beam emitted by the laser pointer corresponds to the center position, which is simple and convenient; the laser pointer and the bubble level are observed at the same time to avoid adjusting one of them while the other is offset; in addition, the laser pointer and the bubble level are always set on the embedded part before the embedded part is fixed, so it is convenient to observe whether the position of the embedded part is offset at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of embedded parts of steel structure;

[0023] Figure 2 It is the structural schematic diagram of the steel cage;

[0024] Figure 3 This is a schematic diagram of the structure after welding steel bars to the embedded parts of the steel structure;

[0025] Figure 4 It is a structural schematic diagram of the positioning device installed on the embedded parts of the steel structure;

[0026] Figure 5 is a structural schematic diagram of a positioning device;

[0027] Figure 6 is a schematic structural diagram of a first fastener;

[0028] Figure 7 is a schematic structural diagram of a second fastener;

[0029] Figure 8 This is a schematic diagram of the structure after the positioning device and embedded parts are moved as a whole onto the steel cage during construction.

[0030] Specific structural description in the figure: 1 steel structure embedded parts, 11 through holes, 12 steel bars, 2 steel cages, 21 cross marks, 3 upper buckles, 4 lower buckles, 41 half buckles, 5 first fasteners, 51 movable buckles, 511 brackets, 512 handles, 513 U-shaped lock buckles, 514 bending parts, 52 fixed buckles, 61 first hinges, 62 second hinges, 71 first bubble level, 72 second bubble level, 8 laser indicators, 9 second fasteners. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Reference Figure 4-5 , an upper and lower closed positioning device for centering steel structure embedded parts, comprising an upper buckle ring 3 and a lower buckle ring 5, a laser indicator 8 is arranged at the center of the upper buckle ring 3, the laser beam emitted by the laser indicator 8 corresponds to the center position of the upper buckle ring 3 and is perpendicular to the upper buckle ring 3, and the upper buckle ring 3 is provided with a first bubble level 71 and a second bubble level 72 which are arranged perpendicular to each other; during installation, the upper buckle ring 3 is buckled on the top edge of the steel structure embedded part 1, and the lower buckle ring 4 is buckled on the bottom edge of the steel structure embedded part 1, and a first buckle member 5 for connecting and fixing the two is arranged between the upper buckle ring 3 and the lower buckle ring 4; the lower buckle ring 4 comprises two symmetrical half buckles 41, and a second buckle member 9 for connecting and fixing the two is arranged between the two half buckles 41.

[0036] Specifically, first open the first fastener 5 and the second fastener 9 on the positioning device so that the first fastener 5 and the second fastener 9 do not block the steel structure embedded part 1, fasten the unfolded lower buckle ring 4 to the bottom of the steel structure embedded part 1, and lock the lower buckle ring 4 by the second buckle 9; then fasten the upper buckle ring 3 to the top of the steel structure embedded part 1, fasten the upper buckle ring 3 and the lower buckle ring 4 by the first buckle 5, so that the steel structure embedded part 1 is combined with the positioning device; and the upper buckle ring 3 is provided with a laser indicator 8, a first bubble level 71 and a second bubble level 72, and the levelness of the steel structure embedded part 1 is adjusted by the first bubble level 71 and the second bubble level 72, and a laser beam is emitted by the laser indicator 8, and the laser beam passes through the through hole 11 on the steel structure embedded part 1 for centering. It should be noted that the first bubble level 71 and the second bubble level 72 may have the same structure, including a level tube, which is made of glass. The inner wall of the level tube is a curved surface with a certain radius of curvature. The tube is filled with liquid. When the level tube is tilted, the bubble in the level tube moves to the raised end, thereby determining the position of the horizontal plane.

[0037] In this way, using the positioning device, centering and leveling can be performed simultaneously, and the leveling process is completed in one step, without the need to change the position measurement multiple times as in the past; the centering process only needs to observe whether the laser beam emitted by the laser pointer 8 corresponds to the center position, which is simple and convenient; the laser pointer 8 and the bubble level are observed at the same time to avoid adjusting one of them while the other is offset; in addition, the laser pointer 8 and the bubble level are always set on the embedded parts before the embedded parts are fixed, so that it is convenient to observe whether the position of the embedded parts is offset at any time.

[0038] In the above scheme, the upper buckle ring 3 and the lower buckle ring 4 are both annular angle steel structures. After installation, the upper buckle ring 3 wraps the top edge of the steel structure embedded part 1 and the upper part of the side wall of the steel structure embedded part 1; the lower buckle ring 4 wraps the bottom edge of the steel structure embedded part 1 and the lower part of the side wall of the steel structure embedded part 1. The upper buckle ring 3 and the lower buckle ring 4 are both angle steel structures. After installation, they can simultaneously wrap the top surface, side wall and bottom surface of the steel structure embedded part 1, completely restricting the relative movement of the positioning device and the steel structure embedded part 1 in six degrees of freedom. In the process of adjusting the steel structure embedded part 1, the positioning device completely obeys the movement of the steel structure embedded part 1, thereby ensuring accurate and effective centering adjustment.

[0039] In the above solution, after the two half buckles 41 are spliced ​​to form the lower buckle 4, two connection ends are formed between the two, one of which is hinged by the second hinge 62, and the other is connected and fixed by the second buckle 9. That is, before installation, the two half buckles 41 are connected together by the second hinge 62, and when installing, the lower buckle 4 is unfolded and buckled around the outer periphery of the steel structure embedded part 1, so that the lower buckle 4 can be wrapped around the bottom of the steel structure embedded part 1. The use of the second hinge 62 can facilitate the installation of the lower buckle 4.

[0040] In the above solution, a first hinge 61 is provided between the upper buckle ring 3 and one of the half buckle rings 41 for hingedly connecting the two. Thus, before installation, the upper buckle ring 3 and the two lower buckle rings 41 are connected as one body, and during installation, the installation can be completed by simply rotating. The integrated positioning device can avoid the loss of parts, and during installation, the first hinge 61 and the second hinge 62 can be used as the base point of connection, which is more convenient when locking and fixing.

[0041] In the above scheme, refer to Figure 6 The first fastener 5 includes a fixed buckle 52 and a movable buckle 51, a plurality of the fixed buckles 52 are circumferentially arranged on the lower buckle ring 4, a plurality of the movable buckles 51 are circumferentially arranged on the upper buckle ring 3, and the fixed buckles 52 and the movable buckles 51 are correspondingly arranged; the movable buckle 51 includes a bracket 511, a handle 512 and a U-shaped lock buckle 513, the bracket 511 is fixed on the upper buckle ring 3, the handle 512 is hinged to the bracket 511, and the U-shaped lock buckle 513 is hinged to the handle 512, and the U-shaped lock buckle 513 can be fastened or detached from the fixed buckle 52 by rotating the handle 512.

[0042] In the above scheme, the fixed buckle 52 is fixed to the lower surface of the lower buckle ring 4, and the movable buckle 51 is fixed to the upper surface of the upper buckle ring 3; the U-shaped lock buckle 513 includes two bent portions 514 bent to the side, and the U-shaped lock 513 is "C-shaped" when viewed from the side, so that the upper end of the U-shaped lock buckle 513 is hinged to the handle 512, and the lower end is wrapped around the lower buckle ring 4 and buckled with the fixed buckle 52. The movable buckle 51 and the fixed buckle 52 are respectively fixed to the upper surface of the upper buckle ring 3 and the lower surface of the lower buckle ring 4, and can hold the upper buckle ring 3 and the lower buckle ring 4 from top to bottom, and the fastening force is better after fastening. In addition, the reaction force on the movable buckle 51 and the fixed buckle 52 is perpendicular to the installation plane, so that the load that the movable buckle 51 and the fixed buckle 52 can bear can be increased, and the movable buckle 51 and the fixed buckle 52 can be prevented from falling off.

[0043] In the above scheme, refer to Figure 7The second fastener 9 has the same main structure as the first fastener 5 , including a fixed buckle 52 and a movable buckle 51 . The difference is that the U-shaped lock buckle 513 of the second fastener 9 does not include the bending portion 514 in the first fastener 5 .

[0044] The construction method for centering a steel structure embedded part using any of the above-mentioned upper and lower closed positioning devices for centering a steel structure embedded part comprises the following steps:

[0045] Step 1, installing the steel structure embedded part on the positioning device; specifically, during installation, first open the first buckle and the second buckle on the positioning device so that the first buckle and the second buckle do not block the steel structure embedded part, buckle the unfolded lower buckle ring to the bottom of the steel structure embedded part, and lock the lower buckle ring by the second buckle; then buckle the upper buckle ring to the top of the steel structure embedded part, and buckle the upper buckle ring and the lower buckle ring by the first buckle, so that the steel structure embedded part is fixed between the upper buckle ring and the lower buckle ring and cannot fall out;

[0046] Step 2, refer to Figure 8 , mark the center with a cross mark on the bottom of the steel cage, move the positioning device and the steel structure embedded parts as a whole to the steel cage, center them with the laser beam emitted by the laser pointer, and level them with the first bubble level and the second bubble level; specifically, you can first observe the first bubble level and the second bubble level, and then observe the laser beam emitted by the laser pointer. When the bubbles on the first bubble level and the second bubble level are both located on the horizontal line, it means that the steel structure embedded parts are placed horizontally. In the horizontal state, the laser beam emitted by the laser pointer is vertical, and when the laser beam is facing the center of the cross mark, the centering is completed;

[0047] Step three, after the centering and leveling is completed, while maintaining the position of the embedded steel structure parts, the steel cage is welded to the embedded steel structure parts to fix the position of the embedded steel structure parts; specifically, the steel cage can be welded to some of the steel bars, and during the welding process, the first bubble level, the second bubble level and the laser beam emitted by the laser indicator are observed to avoid the position of the embedded steel structure parts from shifting; when the steel cage is welded to some of the steel bars, and the embedded steel structure parts shift, the steel cage, the steel bars or the embedded steel structure parts are gently tapped with a hammer or other tool to fine-tune the position of the embedded steel structure parts. After the fine-tuning is completed, the steel cage is welded to the remaining steel bars to completely fix the embedded steel structure parts;

[0048] It should be noted that the position of the steel structure embedded part can be returned to the accurate position by fine-tuning the position of the steel structure embedded part. This is because the first bubble level, the second bubble level and the laser beam emitted by the laser indicator are observed during the welding of the steel cage and some steel bars, so that the position of the steel structure embedded part will not deviate greatly and can be adjusted by fine-tuning.

[0049] Step 4: Remove the positioning device from the embedded steel structure part. Specifically, when removing the positioning device, first loosen the first buckle and the second buckle, and then remove the upper buckle and the lower buckle from the embedded steel structure part; the operation is simple and convenient, which improves the efficiency of centering and leveling, and also improves the accuracy of centering and leveling.

[0050] The above is only a preferred embodiment of the present invention, and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description of the present invention are still within the scope of the patent of the present invention.

Claims

1. A closed-up and closed-down positioning device for centering embedded parts of steel structures, characterized in that: It comprises an upper buckle ring and a lower buckle ring, a laser indicator is arranged at the center of the upper buckle ring, the laser beam emitted by the laser indicator corresponds to the center position of the upper buckle ring and is perpendicular to the upper buckle ring, and a first bubble level and a second bubble level which are arranged perpendicular to each other are arranged on the upper buckle ring; during installation, the upper buckle ring is buckled to the top edge of the steel structure embedded part, and the lower buckle ring is buckled to the bottom edge of the steel structure embedded part, and a first buckle member for connecting and fixing the upper buckle ring and the lower buckle ring is arranged between the upper buckle ring and the lower buckle ring; the lower buckle ring comprises two symmetrical half buckles, and a second buckle member for connecting and fixing the two is arranged between the two half buckles.

2. The upper and lower closed positioning device for centering embedded parts of a steel structure as claimed in claim 1, characterized in that: The upper buckle ring and the lower buckle ring are both annular angle steel structures. After installation, the upper buckle ring wraps the top edge of the steel structure embedded part and the upper part of the side wall of the steel structure embedded part; the lower buckle ring wraps the bottom edge of the steel structure embedded part and the lower part of the side wall of the steel structure embedded part.

3. The upper and lower closed positioning device for centering embedded parts of a steel structure according to claim 1, characterized in that: After the two half buckles are spliced ​​together to form the lower buckle, two connection ends are formed between the two, one of which is hinged by the second hinge, and the other is connected and fixed by the second buckle.

4. The upper and lower closed positioning device for centering embedded parts of a steel structure as claimed in claim 3, characterized in that: A first hinge for hingedly connecting the upper buckle ring and one of the half buckles is provided between the upper buckle ring and one of the half buckles.

5. The upper and lower closed positioning device for centering embedded parts of a steel structure as claimed in claim 2, characterized in that: The first fastener includes a fixed buckle and a movable buckle, a plurality of the fixed buckles are circumferentially arranged on the lower buckle ring, a plurality of the movable buckles are circumferentially arranged on the upper buckle ring, and the fixed buckle and the movable buckle are correspondingly arranged; the movable buckle includes a bracket, a handle and a U-shaped lock, the bracket is fixed on the upper buckle ring, the handle is hinged to the bracket, and the U-shaped lock is hinged to the handle, and the U-shaped lock can be fastened or detached from the fixed buckle by rotating the handle.

6. The upper and lower closed positioning device for centering embedded parts of a steel structure as claimed in claim 5, characterized in that: The fixed buckle is fixed to the lower surface of the lower buckle ring, and the movable buckle is fixed to the upper surface of the upper buckle ring; the U-shaped lock buckle includes two bent portions bent to the side, and the U-shaped lock buckle is "C-shaped" when viewed from the side, so that the upper end of the U-shaped lock buckle is hinged to the handle, and the lower end is wrapped around the lower buckle ring and buckled with the fixed buckle.

7. The upper and lower closed positioning device for centering embedded parts of a steel structure as claimed in claim 6, characterized in that: The second fastener has the same main structure as the first fastener, including a fixed buckle and a movable buckle, but the difference is that the U-shaped lock of the second fastener does not include the bent portion of the first fastener.

8. A construction method for centering steel structure embedded parts using the upper and lower closed positioning device for centering steel structure embedded parts according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Install the steel structure embedded parts on the positioning device; Step 2: mark the center with a cross mark on the bottom of the steel cage, move the positioning device and the embedded steel structure parts onto the steel cage as a whole, center them with the laser beam emitted by the laser pointer, and level them with the first bubble level and the second bubble level; Step 3: After the centering and leveling are completed, the steel cage is welded and fixed to the steel structure embedded parts while the position of the steel structure embedded parts is maintained, so that the position of the steel structure embedded parts is fixed; Step 4: remove the positioning device from the steel structure embedded part.

9. A construction method according to claim 8, characterized in that: In step one, first open the first buckle and the second buckle on the positioning device so that the first buckle and the second buckle do not block the steel structure embedded part, fasten the unfolded lower buckle ring to the bottom of the steel structure embedded part, and lock the lower buckle ring by the second buckle; then fasten the upper buckle ring to the top of the steel structure embedded part, fasten the upper buckle ring and the lower buckle ring by the first buckle, so that the steel structure embedded part is fixed between the upper buckle and the lower buckle and cannot fall out.

10. A construction method according to claim 8, characterized in that: First, a steel bar is welded at the bottom of the steel structure embedded part, and then the steel structure embedded part is installed on the positioning device; when the positioning device and the steel structure embedded part are moved onto the steel cage as a whole, the steel bar is inserted into the steel cage; after the centering and leveling of the steel structure embedded part is completed, the steel bar and the steel cage are fixed by bundling and / or welding while maintaining the position of the steel structure embedded part.

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