Construction method of large-span steel corridor in advance unloading on steel reinforced concrete bracket

Abstract

The application discloses a construction method for early unloading of a large-span steel corridor on a steel reinforced concrete bracket, and comprises the following steps: S1, synchronously hovering and lifting a steel bracket part of the steel reinforced concrete bracket and the large-span steel corridor to a specified height; S2, welding the steel bracket on a steel reserved bracket; S3, fixedly installing a rubber elastic support at the bottom of a suspended beam under the steel corridor; S4, sequentially installing two groups of embedded part embedded plates and a plurality of I-shaped steel embedded parts under the elastic support, and adjusting and ensuring the connection between the steel bracket and the large-span steel corridor by using two-way bolts on the embedded part embedded plates; S5, evenly unloading the large-span steel corridor on the steel bracket of the steel reinforced concrete bracket; and S6, binding bracket steel bars, supporting a formwork and pouring concrete. The application can reduce the hoisting times of overall construction, timely reduce the temporary load borne by the main structure during construction, save the waiting time after traditional concrete bracket construction and pouring, and significantly shorten the overall construction period.

Description

Technical Field

[0001] This invention relates to the field of building corridor construction technology, specifically to a construction method for pre-unloading of a large-span steel corridor onto a steel-concrete corbel. Background Technology

[0002] In modern architecture, long-span steel corridors are widely used in projects such as commercial complexes and large public facilities as a structure connecting different buildings. Steel corridors usually use steel structures as the main support system. In order to enhance the connection strength and seismic performance between them and the main building, steel-concrete corbels are often set at the connection points, which can effectively transfer loads and increase the overall stability of the structure.

[0003] In traditional construction methods, steel-concrete composite brackets are important load-bearing and connecting components. Their construction process typically involves prefabricating molds, pouring concrete, waiting for the concrete to air dry and cure, and then erecting the steel connecting corridor. This process is not only complex and time-consuming, but also involves multiple steps, such as the erection and dismantling of formwork and concrete curing. Each step requires strict quality control and time planning, which can easily increase construction costs and extend the construction period in actual construction. Furthermore, there are safety hazards during high-altitude welding and positioning.

[0004] Therefore, this application proposes a construction method for pre-unloading of a large-span steel connecting corridor onto a steel-concrete corbel to solve the above-mentioned technical problems. Summary of the Invention

[0005] The main objective of this invention is to provide a construction method for pre-unloading of large-span steel connecting corridors onto steel-concrete corbels. This method is applicable to the direct welding operation of steel-concrete corbels while the corbels are in the lifting state of the steel connecting corridor, thereby facilitating the pre-unloading of large-span steel connecting corridors and solving the aforementioned technical problems.

[0006] The present invention solves the above-mentioned technical problems by adopting the following technical solutions:

[0007] A construction method for pre-unloading large-span steel connecting corridors onto steel-concrete corbels includes the following specific operational steps:

[0008] S1. Use a crane to lift the steel corbel section of the steel-concrete corbel and the large-span steel connecting corridor to the designated height and suspend them.

[0009] S2. Install steel brackets and weld steel brackets directly onto the pre-reserved steel brackets in the building;

[0010] S3. Use high-strength bolts or chemical anchors to fix and install rubber elastic supports at the bottom of the cantilever beam under the steel connecting corridor;

[0011] S4. Install two sets of embedded plates and multiple I-beam embedded parts in sequence under the elastic support, and use bidirectional bolts on the embedded plates to adjust and ensure that the steel brackets are connected to the large-span steel corridor.

[0012] S5. By controlling the elevation, the large-span steel connecting corridor is evenly unloaded and erected on the steel corbel of the steel-concrete corbel;

[0013] S6. Tie the reinforcing steel bars of the corbel, set up the formwork, and pour concrete to obtain a complete steel-concrete corbel.

[0014] Preferably, the embedded plate includes an upper embedded plate and a lower embedded plate arranged in parallel, and the bottom of the upper embedded plate is provided with multiple sets of short reinforcing bars. The specific installation process of installing the two sets of embedded plates and multiple I-beam embedded parts in step S4 includes:

[0015] S41. Drill holes in the upper embedded plate and use bolts or chemical anchors to adjust and fix it to the bottom of the elastic bracket;

[0016] S42. The upper and lower embedded plates are connected at the outer end by multiple sets of bidirectional bolts;

[0017] S43. Place I-beam embedded parts evenly at preset positions on the lower embedded plate;

[0018] S44. Install short reinforcing bars at the bottom of the upper embedded plate according to the placement position of the I-beam embedded parts;

[0019] S45. The lower embedded plate is welded to the steel bracket or connected using high-strength bolts;

[0020] S46. Adjust the distance between the steel connecting corridor under the cantilever beam and the steel corbel on the embedded plate of the pre-embedded part by means of bidirectional bolts until the I-beam embedded part is clamped.

[0021] Preferably, the I-beam embedded part is in an I-beam facing upwards.

[0022] Preferably, the short reinforcing bars are distributed inside the U-groove of the I-beam embedded part, and the short reinforcing bars slide against the surface of the I-beam embedded part.

[0023] Preferably, in step S43, the I-beam embedded parts need to be sandblasted to remove rust or coated with primer to prevent rusting after the concrete is poured.

[0024] Preferably, the bidirectional bolts are detachable when the large-span steel connecting corridor is unloaded after step S5.

[0025] This invention provides a construction method for pre-unloading large-span steel connecting corridors onto steel-concrete corbels. Compared with existing technologies, the advantages of this invention are reflected in:

[0026] 1. The method of the present invention unloads the steel brackets in advance during the installation of the steel connecting corridor, which can reduce the number of hoisting operations during the overall construction, reduce the temporary load on the main structure during construction, reduce the risk of structural damage caused by long-term excessive load, and improve the safety of the construction site. At the same time, compared with the existing technology, it eliminates the waiting time after concrete pouring, significantly shortens the overall construction cycle, avoids the need for long-term on-site maintenance, and improves construction efficiency.

[0027] 2. The method of the present invention enables the structure to better adapt to minor deformations during construction, which is beneficial to maintaining the integrity of the structure. In particular, under the action of earthquakes or other external loads, it improves the toughness of the structure and ensures the accuracy of the bracket installation and the stability of the structure.

[0028] 3. This invention, through the uniform distribution of multiple I-beam embedded parts, can ensure uniform stress distribution when the corbel supports the steel connecting corridor, allowing the load to be smoothly transferred from the suspended beam under the steel connecting corridor to the supporting structure, and then distributed to the foundation, ensuring uniform load distribution, avoiding the generation of concentrated stress, and thus improving the load-bearing capacity of the corbel on the building.

[0029] 4. When the upper and lower sets of embedded plate structures are brought close together by bidirectional bolts, the present invention, in conjunction with short reinforcing bars, can limit the I-beam embedded parts, ensuring that the I-beam embedded parts are accurately fixed in the preset position, preventing displacement due to external forces during construction, and improving the accuracy and reliability of installation. At this time, the limited I-beam embedded parts can not only withstand the vertical load from the upper structure, but also effectively resist the horizontal shear force and torque. Especially under extreme conditions such as strong winds and earthquakes, it can significantly improve the overall stiffness and stability of the structure and reduce the risk of damage caused by deformation. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of the overall process of the present invention;

[0032] Figure 2 This is a three-dimensional schematic diagram of the steel bracket of the present invention under load-bearing conditions.

[0033] Figure 3 This is a schematic diagram of the hoisting and lifting position of the steel bracket of the present invention;

[0034] Figure 4 This is a three-dimensional schematic diagram of the elastic bracket and the embedded plate of the pre-embedded part of the present invention in the installation state;

[0035] Figure 5This is a physical diagram showing the layout of the short-direction reinforcing bars in this invention;

[0036] Figure 6 This is a three-dimensional schematic diagram of the overall structure of the large-span steel connecting corridor under the condition of pre-unloading.

[0037] In the picture:

[0038] 1. Reserved corbel; 2. Steel connecting corridor under cantilever beam; 3. Steel corbel; 4. Flexible support; 5. Embedded plate; 51. Upper embedded plate; 52. Lower embedded plate; 53. Short reinforcing bar; 6. I-beam embedded part; 7. Two-way bolt. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the first embodiment, see details below. Figures 1 to 6 .

[0041] like Figure 1 As shown, this invention provides a construction method for pre-unloading of a long-span steel connecting corridor onto a steel-concrete corbel, including the following specific operating steps:

[0042] S1. Use a crane to lift the steel corbel 3 parts of the steel-concrete corbel and the large-span steel connecting corridor to the designated height and suspend them.

[0043] S2. Install the steel bracket 3 and weld the steel bracket 3 directly onto the pre-reserved steel bracket 1 in the building. (Refer to...) Figure 3 At this time, the distance between the steel connecting corridor under the cantilever beam 2 and the steel corbel 3 should be the reserved preset distance L;

[0044] S3. Use high-strength bolts or chemical anchors to fix and install the rubber elastic bracket 4 at the preset position at the bottom of the steel connecting corridor under the cantilever beam 2;

[0045] The function of the rubber elastic support 4 is to absorb the minor deformations that may occur during construction and later use, and to protect the structure from stress concentration damage.

[0046] S4. Reference Figure 4 Two sets of embedded plates 5 and multiple I-beam embedded parts 6 are installed in sequence below the elastic support 4, and the two sets of embedded plates 5 are connected by two-way bolts 7. Adjustment is made to ensure that the steel bracket 3 is connected to the large-span steel corridor.

[0047] At this time, the embedded plate 5 is used for subsequent structural connection, such as the connection between the corbel and the main structure of the cantilever beam under the corridor through the embedded plate 5 and the elastic support 4. When installing the embedded plate 5, it is also necessary to evenly distribute and accurately open the holes according to the usage requirements so as to ensure that the position of the embedded plate is accurate during use. The embedded plate 5 includes an upper embedded plate 51 and a lower embedded plate 52 arranged in parallel, and the bottom of the upper embedded plate 51 is provided with multiple sets of short steel bars 53.

[0048] It should be noted that the embedded plate 5 and the elastic bracket 4 should be installed close to the reserved bracket 1 during the installation process to improve the load-bearing effect of the bracket;

[0049] Specifically, the installation process for installing two sets of embedded plates 5 and multiple I-beam embedded parts 6 includes:

[0050] S41. Precisely drill holes in the upper embedded plate 51 and use bolts or chemical anchors to adjust and fix it at the designated position at the bottom of the elastic bracket 4 by opening through holes;

[0051] S42. The upper embedded plate 51 and the lower embedded plate 52 are connected at the outer end by multiple sets of bidirectional bolts 7;

[0052] S43. The I-beam embedded part 6, as an important load-bearing component, must be positioned strictly according to the design drawings and tightly connected to the embedded plate 5 using special fasteners (generally bolt assemblies) to ensure it can bear the weight and dynamic loads of the subsequent structure. Therefore, the installation process of the I-beam embedded part 6 includes:

[0053] (1) Sandblasting or applying primer to the I-beam embedded part 6 is used to prevent the I-beam embedded part 6 from rusting after concrete pouring, thereby improving the durability and strength of the structure.

[0054] (2) I-beam embedded parts 6 are evenly distributed at preset positions on the lower embedded plate 52. At this time, the I-beam embedded parts 6 are in the I-beam upward posture, and the connection posture of the I-beam embedded parts 6 is consistent, so as to meet the dynamic load requirements of the overall structure.

[0055] It should also be noted that the I-beam embedded part 6 should be placed with the future structural connection needs in mind before installation. During installation, it is necessary to ensure that there is enough space around the I-beam embedded part 6 to facilitate subsequent welding or bolting. At the same time, the possible gaps between components should also be considered to accommodate expansion or contraction caused by different temperature changes.

[0056] S44. Install short reinforcing bars 53 at the bottom of the upper embedded plate 51 according to the placement position of the I-beam embedded part 6;

[0057] S45. The lower embedded plate 52 is welded to the steel bracket 3 or connected using high-strength bolts;

[0058] At this point, the I-beam embedded part 6 can be welded or bolted onto the lower embedded plate 52 according to actual construction needs.

[0059] S46. Adjust the distance between the steel connecting corridor under-beam 2 and the steel bracket 3 on the embedded plate 5 using the bidirectional bolts 7 until the I-beam embedded part 6 is clamped in place. At this time, you can refer to... Figure 4 and Figure 5 The short reinforcing bars 53 are distributed inside the U-groove of the I-beam embedded part 6, and the short reinforcing bars 53 slide against the surface of the I-beam embedded part 6.

[0060] It should be noted that the embedded plate 5 of the pre-embedded part can be tightly bonded to the corbel concrete by grouting or other fixing methods in the future.

[0061] In addition, it should be noted that the height of the I-beam embedded part 6 in its placement state should be greater than the extension length of the short reinforcing bar 53, and the height of the I-beam embedded part 6 in its placement state should also be less than the preset distance L.

[0062] S5. Reference Figure 6 By controlling the elevation, the lower cantilever beam 2 of the large-span steel corridor is evenly unloaded and erected on the steel corbel 3 of the steel-concrete corbel, thus completing the pre-unloading operation of the large-span steel corridor on the steel corbel 3.

[0063] At this point, with the cantilever beam 2 of the large-span steel connecting corridor unloaded, the bidirectional bolts 7 on the embedded plate 5 can be threaded off to complete the disassembly. At this time, refer to... Figure 2 ;

[0064] S6. Tie the reinforcing steel bars of the corbel, set up the formwork, and pour concrete. After the pouring is completed, it becomes a complete steel-concrete corbel.

[0065] In summary, the construction method adopted in this technical solution involves unloading the steel brackets 3 in advance during the installation of the steel connecting corridor. This reduces the number of hoisting operations during the overall construction, promptly alleviates the temporary load on the main structure during construction, and lowers the risk of structural damage caused by long-term excessive loads. This significantly improves the safety of the construction site. Compared with existing technologies, it eliminates the waiting time after concrete pouring, significantly shortens the overall construction cycle, avoids the need for long-term on-site curing, and improves construction efficiency.

[0066] Meanwhile, during use, this construction method, by unloading in advance and using a combination of elastic supports 4, embedded plates 5, and I-beam embedded parts 6 to bear the load of the steel connecting corridor, enables the structure to better adapt to minor deformations during construction, which is beneficial to maintaining the integrity of the structure. Especially under the action of earthquakes or other external loads, it improves the toughness of the structure and ensures the accuracy of the bracket installation and the stability of the structure.

[0067] Based on the first embodiment described above, a second embodiment is proposed.

[0068] refer to Figure 4 , Figure 5 and Figure 6 The present invention provides a construction component for pre-unloading of a large-span steel connecting corridor on a steel-concrete corbel, which is set at the bottom of the lower cantilever beam 2 of the steel connecting corridor and is used for unloading support of the lower cantilever beam 2 of the steel connecting corridor on the steel corbel 3.

[0069] The construction components include an elastic bracket 4 fixed to the bottom of the steel connecting corridor cantilever beam 2 by high-strength bolts or chemical anchors, and an embedded plate 5 set at the bottom of the elastic bracket 4 by bolts or chemical anchors. The embedded plate 5 is set on the steel connecting corridor cantilever beam 2 of the large-span steel connecting corridor, wherein:

[0070] The embedded plate 5 includes an upper embedded plate 51 and a lower embedded plate 52 arranged in parallel. The bottom of the upper embedded plate 51 is provided with multiple sets of short reinforcing bars 53. The lower embedded plate 52 is welded or installed on the steel bracket 3 using high-strength bolts.

[0071] Multiple sets of evenly distributed I-beam embedded parts 6 are provided between the upper embedded plate 51 and the lower embedded plate 52, which can ensure that the corbel supports the steel corridor with uniform force, so that the load can be smoothly transferred from the lower suspended beam 2 of the steel corridor to the supporting structure, and then distributed to the foundation, ensuring uniform load distribution, avoiding the generation of concentrated stress, and thus improving the load-bearing effect of the corbel on the building.

[0072] In practical use, multiple sets of bidirectional bolts 7 are also provided between the upper embedded plate 51 and the lower embedded plate 52 to drive and control the upper embedded plate 51 and the lower embedded plate 52 to move closer or further away from each other. During the process of the upper embedded plate 51 and the lower embedded plate 52 moving closer to each other, they are used to clamp and fix the I-beam embedded part 6.

[0073] Furthermore, it should be noted that the short reinforcing bars 53 are fitted inside the U-groove of the I-beam embedded part 6. Therefore, during the clamping process of the upper embedded plate 51 and the lower embedded plate 52, the short reinforcing bars 53 can slide and fit against the surface of the I-beam embedded part 6. Under the clamped state, the I-beam embedded part 6 is limited in planar movement, ensuring that the I-beam embedded part 6 is accurately fixed in the preset position. This prevents displacement due to external forces during construction, improves the accuracy and reliability of the installation. Moreover, the limited I-beam embedded part 6 can not only withstand the vertical load from the upper structure, but also effectively resist the horizontal shear force and torque. Especially under extreme conditions such as strong winds and earthquakes, it can significantly improve the overall stiffness and stability of the structure and reduce the risk of damage caused by deformation.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0075] Furthermore, it should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of the present invention, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0076] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, in the embodiments of this invention, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. A construction method for pre-unloading a large-span steel connecting corridor onto a steel-concrete corbel, characterized in that, The specific operating steps include the following: S1. Use a crane to lift the steel corbel (3) part of the steel-concrete corbel and the large-span steel connecting corridor to the designated height and suspend them. S2. Install steel brackets (3) and weld steel brackets (3) directly onto the pre-reserved steel brackets (1) of the building; S3. Use high-strength bolts or chemical anchors to fix and install rubber elastic brackets (4) at the bottom of the cantilever beam (2) under the steel corridor; S4. Install two sets of embedded plates (5) and multiple I-beam embedded parts (6) in sequence below the elastic support (4), and use bidirectional bolts (7) on the embedded plates (5) to adjust and ensure that the steel bracket (3) is connected to the large-span steel corridor; S5. By controlling the elevation, the large-span steel connecting corridor is evenly unloaded and erected on the steel corbel (3) of the steel-concrete corbel; S6. Tie the reinforcing steel bars of the corbel, set up the formwork, and pour concrete to obtain a complete steel-concrete corbel.

2. The construction method for pre-unloading of a large-span steel connecting corridor onto a steel-concrete corbel as described in claim 1, characterized in that, The embedded plate (5) includes an upper embedded plate (51) and a lower embedded plate (52) arranged in parallel, and the bottom of the upper embedded plate (51) is provided with multiple sets of short reinforcing bars (53). The specific installation process of installing the two sets of embedded plates (5) and multiple I-beam embedded parts (6) in step S4 includes: S41. Make a hole in the upper embedded plate (51) and use bolts or chemical anchors to adjust and fix it to the bottom of the elastic bracket (4); S42. The upper embedded plate (51) and the lower embedded plate (52) are connected at the outer end by multiple sets of bidirectional bolts (7); S43. Place I-beam embedded parts (6) evenly at preset positions on the lower embedded plate (52); S44. Install short reinforcing bars (53) at the bottom of the upper embedded plate (51) according to the placement position of the I-beam embedded part (6); S45. Weld the lower embedded plate (52) to the steel bracket (3) or connect them using high-strength bolts; S46. Adjust the distance between the steel connecting corridor underbeam (2) and the steel corbel (3) on the embedded plate (5) by means of bidirectional bolts (7) until the I-beam embedded part (6) is clamped.

3. The construction method for pre-unloading of a large-span steel connecting corridor onto a steel-concrete corbel as described in claim 2, characterized in that, The I-beam embedded part (6) is in an I-beam facing upwards.

4. The construction method for pre-unloading of a large-span steel connecting corridor on a steel-concrete corbel as described in claim 3, characterized in that, The short reinforcing bars (53) are distributed inside the U-groove of the I-beam embedded part (6), and the short reinforcing bars (53) slide against the surface of the I-beam embedded part (6).

5. The construction method for pre-unloading of a large-span steel connecting corridor on a steel-concrete corbel as described in claim 2, characterized in that, Before placing the I-beam embedded part (6) in step S43, it needs to be sandblasted to remove rust or coated with primer to prevent rusting after the concrete is poured.

6. The construction method for pre-unloading of a large-span steel connecting corridor on a steel-concrete corbel as described in claim 1, characterized in that, After step S5, the bidirectional bolt (7) can be removed when the large-span steel connecting corridor is unloaded.

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