Asynchronous construction method for large-span stiff steel beams and segmented construction method for concrete beams

Abstract

The invention discloses an asynchronous construction method for a large-span stiff steel beam, which comprises the following steps of: supporting a steel beam end of a first construction area through an auxiliary supporting device, constructing a later pouring section by relying on a first pouring section after the construction is finished, and reserving a later pouring belt in the middle; after two adjacent sections of reinforced concrete stiff beams are constructed, pouring construction of a post-pouring belt is carried out; and a supporting frame dismantling auxiliary device is arranged at the position of the post-cast strip, and after construction requirements are met, the upper-layer supporting frame and the supporting columns are dismantled. The supporting columns are independently arranged, the structural characteristics of a reinforced concrete stiff structure are flexibly applied, planning and pre-burying are conducted in advance, the overall safety and operability of structural construction are guaranteed, redundant loads are not generated on an original supporting frame, the safety of the original supporting frame is guaranteed, civil construction does not have waiting time, and the construction efficiency is improved. The construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and in particular relates to an asynchronous construction method for a large-span rigid steel beam and a segmented construction method for a concrete beam. Background Art

[0002] With the continuous development of the building steel structure profession, steel structure plays an increasingly important role in building structures. This includes the use of large-span beams. In order to meet the seismic performance and deformation performance of large-span beams, a rigid steel structure is added to the original reinforced concrete structure, which greatly increases the span of the beam. It is more used in places with large spans such as cinemas, opera houses and swimming pools. Due to the division of on-site construction and the limitation of concrete pouring capacity, there are situations where large-span beams need to be constructed asynchronously.

[0003] During construction, when a large-span rigid steel beam spans two or more construction areas, it is common practice to reserve space and wait for conditions to be met before unified construction. However, this method needs to consider the progress of different construction areas, and there is a long waiting time, which affects subsequent construction. Or if the rigid steel beam is light, when the bearing capacity of the support frame is met, the rigid steel beam can be divided into sections, and then placed directly on the support frame using certain measures for segmented pouring. If the weight of the rigid steel beam is heavy, the support frame needs to be encrypted to meet the bearing capacity of the support frame. This method has certain safety hazards because the support frame does not directly support the rigid steel beam, but transmits force through wooden planks and formwork. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an asynchronous construction method for large-span rigid steel beams and a segmented construction method for concrete beams, which solves the problem of potential safety hazards in the support method for segmented construction of large-span rigid steel beams in the prior art.

[0005] The present invention adopts the following technical solutions to solve the above technical problems: A method for asynchronous construction of a large-span rigid steel beam comprises the following steps: Step 1: Before pouring the lower beam, first set the embedded parts for fixing the upper beam pouring support column, and then pour the lower reinforced concrete beam column; Step 2: Set up the upper support frame, and lay the bottom formwork and the bottom reinforcement of the reinforced concrete rigid beam on the support frame; Step 3: Install the rigid steel beam segment, connect one end to the steel bracket on the rigid column, and fix the other end through the upper support column; Step 4: Tie the remaining steel bars and seal the side formwork, and pour the upper reinforced concrete rigid columns, reinforced concrete rigid beams and floor slabs; Step 5: construct the adjacent sections of reinforced concrete beams, leaving a post-casting strip in the middle; Step 6: After the construction of two adjacent sections of reinforced concrete rigid beams is completed, the pouring construction of the post-casting strip is carried out; Step 7: Set up a support frame removal auxiliary device at the location of the post-cast strip. After the construction requirements are met, remove the upper support frame and support columns.

[0006] The support column comprises a support steel body, the lower end of the support steel is fixedly connected to the embedded part, the upper end is provided with a horizontal support plate, and the upper part of the horizontal support plate is provided with a vertical stiffening plate.

[0007] The bottom mold is provided with a through hole having the same size as the horizontal support plate at the position corresponding to the support column. After the support column passes through the through hole, the surrounding area is sealed tightly with a sealing material.

[0008] In step 3, one end of the rigid reinforcement beam segment is connected to the steel bracket by welding, and the lower flange of the other end is connected to the positioning welding of the vertical rigid plate.

[0009] The support frame dismantling auxiliary device includes a first lifting lug welded on the lower flange of the rigid steel beam segment near the post-casting zone, a second lifting lug welded on the lower side of the horizontal support plate and the side of the supporting steel, and a fall chain is connected below the two lifting lugs. When the supporting steel is dismantled, the fall chain is used to lower it to the floor surface.

[0010] The lifting lugs are welded at corresponding positions after the post-casting strips meet the construction conditions and before the casting construction.

[0011] After lowering the supporting steel to the floor surface, remove the fall chain and cut off the lifting lugs protruding from the concrete surface.

[0012] The segmented construction method of a large-span rigid concrete beam comprises the following steps: Step a: According to the design scheme of the long-span rigid concrete beam, the beam is divided into two construction areas for separate construction; Step b, using the support column and the support frame to construct the first section of the construction area from bottom to top; Step c, construct the second construction area, leaving a post-casting strip in the middle; Step d: before the post-casting strip is constructed, the disassembly auxiliary device is arranged; Step e: Carry out post-casting strip construction, and after reaching the required strength, remove the support frame and support column.

[0013] In step c, the second construction area is constructed using conventional methods.

[0014] In step e, the specific process of removing the support frame and the support column is as follows: Step e1, installing fall chains under the first lifting eye and the second lifting eye respectively; Step e2, connecting one end of the fall chain to the supporting steel; Step e3: After cutting the supporting steel, adjust the fall chain to slowly and safely place the supporting steel on the floor surface; Step e4: After the supporting steel is placed on the ground, the fall chain is removed, and the first lifting lug and the second lifting lug protruding from the concrete surface are cut off; Step e5: transport the supporting steel out of the site.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention ensures the overall safety and operability of the structural construction by separately setting support columns and flexibly utilizing the structural characteristics of the reinforced concrete rigid structure, planning and pre-embedding in advance, and does not generate excess load on the original support frame, thereby ensuring the safety of the original support frame. There is no waiting time for civil construction, which saves construction period.

[0016] 2. By setting horizontal support plates and vertical stiffeners on the supporting columns, it is ensured that the concrete pouring does not leak and the smooth binding of the bottom reinforcement of the beam is not affected while ensuring the safety of structural force transmission.

[0017] 3. The structure is simple and easy to process and manufacture. The force is transmitted through rigid connection, which ensures the reliability and safety of the structure. It can meet the needs of asynchronous construction and the requirements of the structure, safety and construction cost-effectiveness of rigid steel beams. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a plan view of the asynchronous construction zones of the large-span rigid structure of the present invention.

[0019] Figure 2 This is a cross-sectional view of the asynchronous construction zones of the large-span rigid structure of the present invention.

[0020] Figures 3 to 11 The following are schematic diagrams of the asynchronous construction steps of the large-span rigid structure of the present invention.

[0021] Among them, the markings in the figure are: 1.1—embedded parts; 1.2—support columns; 1.2.1—vertical stiffeners; 1.2.2—horizontal support plates; 1.2.3—supporting steel; 2.1—lower reinforced concrete beams; 2.2—lower support frames; 3.1—lower reinforced concrete rigid columns; 3.2—rigid columns; 3.3—steel corbels; 3.4—upper reinforced concrete rigid columns; 4.1—first section of rigid steel beams; 4.2—bottom formwork; 4.3—upper support frames; 4.4—first reinforced concrete rigid beams; 4.5—second rigid steel beams; 4.6—second reinforced concrete rigid beams; 5.1—post-cast strips; 6.1—first lifting lugs; 6.2—second lifting lugs; 6.3—falling chains. DETAILED DESCRIPTION

[0022] The structure and working process of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] A method for asynchronous construction of a large-span rigid steel beam comprises the following steps: Step 1: Before pouring the lower beam, first set the embedded parts for fixing the upper beam pouring support column, and then pour the lower reinforced concrete beam column; Step 2: Set up the upper support frame, and lay the bottom formwork and the bottom reinforcement of the reinforced concrete rigid beam on the support frame; Step 3: Install the rigid steel beam segment, connect one end to the steel bracket on the rigid column, and fix the other end through the upper support column; Step 4: Tie the remaining steel bars and seal the side formwork, and pour the upper reinforced concrete rigid columns, reinforced concrete rigid beams and floor slabs; Step 5: construct the adjacent sections of reinforced concrete beams, leaving a post-casting strip in the middle; Step 6: After the construction of two adjacent sections of reinforced concrete rigid beams is completed, the pouring construction of the post-casting strip is carried out; Step 7: Set up a support frame removal auxiliary device at the location of the post-cast strip. After the construction requirements are met, remove the upper support frame and support columns.

[0024] Specific embodiments, such as Figures 1 to 11 As shown, A method for asynchronous construction of a large-span rigid steel beam comprises the following steps: Step 1: Before pouring the lower beam, first set the embedded parts 1.1 for fixing the upper beam pouring support column, and then pour the lower reinforced concrete beam column; Step 2, erect an upper support frame 4.3, and lay a bottom formwork 4.2 and bottom reinforcement of a reinforced concrete beam on the upper support frame 4.3; the bottom formwork 4.2 opens a through hole of the same size as the horizontal support plate 1.2.2 at the position corresponding to the support column 1.2, and after the support column passes through the through hole, the surrounding area is sealed tightly with a plugging material.

[0025] Step 3, install the first rigid steel beam segment 4.1, one end of which is connected to the steel corbel 3.3 on the rigid column 3.2, and the other end is fixed by the upper support column 1.2; the support column 1.2 includes a supporting steel body, the lower end of the supporting steel 1.2.3 is fixedly connected to the embedded part 1.1, a horizontal support plate 1.2.2 is arranged at the upper end, and a vertical rigid plate 1.2.1 is arranged on the upper part of the horizontal support plate 1.2.2, one end of the first rigid steel beam segment 4.1 is welded to the steel corbel 3.3, and the lower flange of the other end is positioned and welded to the vertical rigid plate 1.2.1.

[0026] Step 4: Tie the remaining steel bars and seal the side formwork, and pour the upper reinforced concrete rigid columns 3.4, the first reinforced concrete rigid beams 4.4, and the floor slab; Step 5, construct the second reinforced concrete rigid beam 4.6 of the adjacent section, leaving a post-casting strip 5.1 in the middle; Step 6: After the construction of two adjacent sections of reinforced concrete rigid beams is completed, the pouring construction of the post-casting strip 5.1 is carried out; Step 7: Set a support frame removal auxiliary device at the location of the post-casting strip 5.1, and remove the upper support frame 4.3 and the support column 1.2 after the construction requirements are met. The support frame removal auxiliary device includes a first lifting lug 6.1 welded on the lower flange of the rigid steel beam segment near the post-casting strip area, a second lifting lug 6.2 welded on the lower side of the horizontal support plate 1.2.2 and the side of the supporting steel 1.2.3, and a fall chain 6.3 is connected below the two lifting lugs. When the supporting steel is removed, the fall chain 6.3 is used to lower it to the floor surface.

[0027] The lifting lugs are welded at corresponding positions after the post-casting strips meet the construction conditions and before the casting construction.

[0028] After lowering the supporting steel to the floor surface, remove the fall chain and cut off the lifting lugs protruding from the concrete surface.

[0029] The segmented construction method of a large-span rigid concrete beam comprises the following steps: Step a: According to the design scheme of the long-span rigid concrete beam, the beam is divided into two construction areas for separate construction; Step b, using the support column and the support frame to construct the first section of the construction area from bottom to top; Step c, construct the second construction area, leaving a post-casting strip in the middle; Step d: before the post-casting strip is constructed, the disassembly auxiliary device is arranged; Step e: Carry out post-casting strip construction, and after reaching the required strength, remove the support frame and support column.

[0030] Example The method for segmentally constructing a large-span rigid concrete beam by using an asynchronous construction method for a large-span rigid steel beam comprises the following steps: The first step is to divide the long-span rigid concrete beam into two construction areas according to the design scheme and to carry out construction separately. Before pouring the lower beam, the embedded parts 1.1 are set, and then the lower reinforced concrete beam column 2.1 is poured. Step 2: Make support column 1.2 (including vertical stiffener 1.2.1, horizontal support plate 1.2.2, support steel 1.2.3), weld support steel 1.2.3 and embedded part 1.1, weld vertical stiffener 1.2.1 to the upper end of support steel 1.2.3. When making vertical stiffener 1.2.1, the arch value of the long-span beam needs to be considered; Step 3: Set up the upper support frame 4.3 and lay the bottom formwork 4.2. Open a hole in the bottom formwork corresponding to the position of the support column 1.2 that is the same size as the horizontal support plate 1.2.2, and seal the chamber with a plugging material to ensure that the poured concrete does not leak out. Lay the bottom reinforcement of the first reinforced concrete beam 4.4; Step 4: Install the first rigid steel beam segment 4.1, and promptly butt weld one end of the segment 4.1 to the steel bracket 3.3, and position weld the lower flange of the first rigid steel beam segment 4.1 to the vertical rigid plate 1.2.1; Step 5: Tie up the other steel bars of the first reinforced concrete beam 4.4 and seal the side formwork according to the conventional operation, and then cast the upper reinforced concrete column 3.4, the first reinforced concrete beam 4.4 and the floor slab. At this point, the construction of the first casting area is completed; Step 6: Carry out the construction of the second section post-casting area from bottom to top according to the conventional operation, and after the conditions for closing the post-casting strip 5.1 are met, weld the first lifting lug 6.1 in advance at the lower flange of the first rigid steel beam segment 4.1 near the post-casting strip 5.1, and then carry out the conventional procedures such as casting of the post-casting strip and subsequent removal of the support frame; Step 7: Weld the second lifting lug 6.2 on the lower side of the horizontal support plate 1.2.2 and the side of the supporting steel 1.2.3, use the fall chain 6.3 and the first lifting lug 6.1, cut the supporting steel 1.2.3, and adjust the fall chain 6.3 to slowly and safely place the supporting steel 1.2.3 on the floor surface; Step 8. After placing the support steel 1.2.3 on the ground, remove the fall chain 6.3, cut off the lifting lugs protruding from the concrete surface, and transport the support steel 1.2.3 out using a ladder or material hoist; Step 9: Finally complete the asynchronous construction of large-span rigid steel beams.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0033] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0034] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] This solution is not limited to the above-mentioned specific implementation methods, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solution of this solution without departing from the scope of the technical solution of this solution, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essential content of this solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of this solution without departing from the content of the technical solution of this solution still falls within the scope of protection of the technical solution of this solution.

Claims

1. A method for asynchronous construction of a large-span rigid steel beam, characterized in that: The steps include: Step 1: Before pouring the lower beam, first set the embedded parts for fixing the upper beam pouring support column, and then pour the lower reinforced concrete beam column; Step 2: Set up the upper support frame, and lay the bottom formwork and the bottom reinforcement of the reinforced concrete rigid beam on the support frame; Step 3: Install the rigid steel beam segment, connect one end to the steel bracket on the rigid column, and fix the other end through the upper support column; Step 4: Tie the remaining steel bars and seal the side formwork, and pour the upper reinforced concrete rigid columns, reinforced concrete rigid beams and floor slabs; Step 5: construct the adjacent sections of reinforced concrete rigid beams, leaving a post-casting strip in the middle; Step 6: After the construction of two adjacent sections of reinforced concrete rigid beams is completed, the pouring construction of the post-casting strip is carried out; Step 7: Set up a support frame removal auxiliary device at the location of the post-casting strip. After the construction requirements are met, remove the upper support frame and support columns.

2. The asynchronous construction method of a large-span rigid steel beam according to claim 1 is characterized in that: The support column comprises a support steel body, the lower end of the support steel is fixedly connected to the embedded part, the upper end is provided with a horizontal support plate, and the upper part of the horizontal support plate is provided with a vertical stiffening plate.

3. The asynchronous construction method of a large-span rigid steel beam according to claim 2 is characterized in that: The bottom mold is provided with a through hole having the same size as the horizontal support plate at the position corresponding to the support column. After the support column passes through the through hole, the surrounding area is sealed tightly with a sealing material.

4. The asynchronous construction method of a large-span rigid steel beam according to claim 2 is characterized in that: In step 3, one end of the rigid reinforcement beam segment is connected to the steel bracket by welding, and the lower flange of the other end is connected to the positioning welding of the vertical rigid plate.

5. The asynchronous construction method of a large-span rigid steel beam according to claim 2, characterized in that: The support frame dismantling auxiliary device includes a first lifting lug welded on the lower flange of the rigid steel beam segment near the post-casting zone, a second lifting lug welded on the lower side of the horizontal support plate and the side of the supporting steel, and a fall chain is connected below the two lifting lugs. When the supporting steel is dismantled, the fall chain is used to lower it to the floor surface.

6. The asynchronous construction method of a large-span rigid steel beam according to claim 5, characterized in that: The lifting lugs are welded at corresponding positions after the post-casting strip reaches the construction conditions and before the casting construction.

7. The asynchronous construction method of a large-span rigid steel beam according to claim 6, characterized in that: After lowering the supporting steel to the floor surface, remove the fall chain and cut off the lifting lugs protruding from the concrete surface.

8. The segmented construction method of a large-span rigid concrete beam is characterized by: The steps include: Step a: According to the design scheme of the large-span rigid concrete beam, the beam is divided into two construction areas for separate construction; Step b, using the support column and support frame described in any one of claims 1 to 7 to construct the first construction area from bottom to top in sequence; Step c, construct the second construction area, leaving a post-casting strip in the middle; Step d: before the post-casting strip is constructed, the disassembly auxiliary device according to claim 5 is installed; Step e: Carry out post-casting strip construction, and after reaching the required strength, remove the support frame and support column.

9. The segmented construction method of a large-span rigid concrete beam according to claim 8, characterized in that: In step c, the second construction area is constructed using conventional methods.

10. The segmented construction method of a large-span rigid concrete beam according to claim 9, characterized in that: In step e, the specific process of removing the support frame and the support column is as follows: Step e1, installing fall chains under the first lifting eye and the second lifting eye respectively; Step e2, connecting one end of the fall chain to the supporting steel; Step e3: After cutting the supporting steel, adjust the fall chain to slowly and safely place the supporting steel on the floor surface; Step e4: After the supporting steel is placed on the ground, the fall chain is removed, and the first lifting lug and the second lifting lug protruding from the concrete surface are cut off; Step e5: transport the supporting steel out of the site.

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