Frame structure unloading and column extraction structure and its construction method

Abstract

The present application relates to a frame structure unloading and column extraction structure and its construction method, belonging to the field of building construction. The frame structure unloading and column extraction structure includes a plurality of support seats and jacks installed on the support seats, and the output end of the jacks abuts against the load-bearing beam; through holes orthogonal to each other are provided in the load-bearing column, the length direction of the through holes is the same as the length direction of the corresponding original load-bearing beam, a concrete layer is poured in the load-bearing column within the through holes, the load-bearing beam is connected with a steel mesh, and a fixing component for facilitating the removal of the jacks is arranged within the steel mesh. The present application has the effect of facilitating the unloading of the load-bearing beam by the load-bearing column, improving the safety and convenience of the column extraction operation, greatly shortening the construction period of the column extraction construction, and the use of trace-free cutting during the construction process has environmental protection performance.

Description

Technical Field

[0001] This application relates to the field of building construction, and in particular, to a frame structure unloading and column extraction structure and its construction method. Background Art

[0002] Beam supporting and column extraction is a comprehensive technology for removing part (or all) of a column without demolishing the upper structure of a building, mainly suitable for increasing the usable space or changing the floor plan due to functional changes. Beam supporting and column extraction is a general term for supporting a roof truss and extracting a column, supporting a beam and demolishing a wall, and supporting a beam and extracting a column. It is a comprehensive technology for demolishing a middle column or wall without demolishing or with minimal demolition of the upper structure. Currently, many units often hope to remove the columns or walls of certain buildings to expand their usable space in order to adapt to future further development, and during the renovation process, the normal use function of the structure can be unaffected.

[0003] A Chinese patent with the application number CN201410277963.6 is retrieved and discloses a beam supporting and column extraction construction method. Columns are respectively installed below column A and column C; a hand-pulled hoist installed on the crane beam is used to hoist and install a cross beam, so that the cross beam penetrates through column B and both ends are fixedly connected to the upper ends of the columns. Both ends of the cross beam are firmly fixed to the outer periphery of column A and column C; a column bracket is arranged above the connection between the cross beam and column B, and the column bracket is fixedly connected to column B; the demolition section below column B is removed. The present invention uses the columns adjacent to both sides of the pre-extracted column as support columns, fixes two steel girders to the column to be extracted, transfers the load through the setting of conversion members, does not demolish the upper part of the column, demolishes the lower part of the column, and realizes the renovation of the existing building. And it does not reduce the bearing capacity and overall stiffness of the factory building structure; saves construction space, has a short construction period, does not affect the production of the workshop, and is safe and reliable.

[0004] Regarding the above related technology, the inventor believes that the column extraction process also requires prefabricating a cross beam and hoisting it with an electric hoist. The whole operation is cumbersome and difficult, and there are defects that affect the construction efficiency of column extraction. Summary of the Invention

[0005] In order to improve the problem of convenient column extraction operation, this application provides a frame structure unloading and column extraction structure and its construction method.

[0006] A frame structure unloading and column extraction structure provided by this application adopts the following technical solution:

[0007] A frame structure unloading and column-removing structure includes multiple support seats and jacks installed on the support seats, and the output end of the jack is abutted against the original load-bearing beam; through holes orthogonal to each other are provided in the original load-bearing column, the length direction of the through holes is the same as the length direction of the corresponding support beam, a concrete layer is poured in the through holes of the original load-bearing column, a steel mesh is connected to the original load-bearing beam, and a fixing component for facilitating the removal of the jack is arranged in the steel mesh.

[0008] By adopting the above technical solution, the support seats support the jacks, and the unloading operation of the original load-bearing beam is completed by the jacks on the four sides of the original load-bearing column, which is convenient for drilling and unloading the original load-bearing column. After drilling, the jacks are re-placed at the positions supporting the original load-bearing beam. Through the interaction of the fixing component and the steel mesh, the support of the jacks and the reinforcement of the new load-bearing beam are completed. Concrete is poured into the load-bearing column, greatly improving the load strength of the new load-bearing beam. After the new load-bearing beam is cured, the original load-bearing column is cut by using seamless cutting.

[0009] Optionally, the fixing component includes an outer mold and an enclosure. The enclosure includes multiple connecting plates connected end to end. The connecting plates are connected to the steel mesh. The outer mold includes multiple templates connected end to end. The jack is located in the space enclosed by the enclosure, and the gap between the outer mold and the enclosure is filled with a commercial concrete layer.

[0010] By adopting the above technical solution, a new load-bearing beam is formed by pouring commercial concrete. After the commercial concrete layer is cured and the jacks are enclosed at the same time, it is used to protect and support the jacks.

[0011] Optionally, the connecting plates are gradually inclined towards the jack in the vertical direction, and the opening size of the enclosure near the original load-bearing beam is larger than that of the other end.

[0012] By adopting the above technical solution, the inclined connecting plates are used to support the jacks, reducing the possibility of the jacks falling.

[0013] Optionally, a grouting material layer is poured in the inner cavity of the enclosure.

[0014] By adopting the above technical solution, the grouting material has good fluidity and micro-expansion performance, further ensuring the load-bearing strength in the enclosure and the closer fit between the connecting plates and the grouting material.

[0015] Optionally, the support seats are steel supports placed on the ground.

[0016] By adopting the above technical solution, installing the steel supports on the ground to form the support seats is beneficial to both the removal of the support seats and the installation of the jacks.

[0017] The present application also provides a construction method for the frame structure unloading and column extraction structure, which adopts the following technical solutions:

[0018] A construction method for the frame structure unloading and column extraction structure includes the following steps:

[0019] S1. Jack unloading: Erect steel supports and support three points on two original load-bearing beams around the original load-bearing column.

[0020] S2. Drilling: Core drill the original load-bearing column at the position below the original load-bearing beam to form a through hole, and immediately support it with a jack; Remove the jack in another direction and core drill along this direction until it is completely drilled through in four directions.

[0021] S3. Jack perimeter enclosure: After drilling and reinforcing the original load-bearing beam, four enclosing plates are used to enclose the jack, and the space enclosed by the four enclosing plates gradually decreases from top to bottom.

[0022] S4. Steel bar binding: After steel bar binding, a steel bar mesh is formed.

[0023] S5. External formwork support: Connect multiple formworks outside the steel bar mesh to form an external formwork.

[0024] S6. Pour commercial concrete: Pour commercial concrete into the through hole and the gap between the external formwork and the enclosure to form a commercial concrete layer.

[0025] S7. External formwork removal: Remove the external formwork after the concrete is cured to the designed strength.

[0026] S8. Jack removal: After removing the enclosure, control the jack to eject from the enclosure.

[0027] S9. Pour grouting material: Pour grouting material into the enclosure.

[0028] S10. Column extraction: Cut the column body of the original load-bearing column below the steel bar mesh without damage to form a new load-bearing beam.

[0029] By adopting the above technical solutions, select three sides of the original load-bearing column, install steel supports, complete the construction of the support base, install the jack at the top of the steel support, and make the output end of the jack abut against the original load-bearing beam; After core drilling the original load-bearing column, immediately support it with a jack, remove the jack and steel support in another direction, and core drill along this direction until it is completely drilled through in four directions; The original load-bearing beam is connected with a steel bar mesh. At the same time, after enclosing the jack, support the external formwork, pour a concrete layer between the external formwork and the enclosure and into the through hole, then remove the external formwork and the enclosure plate at the bottom of the jack. After the jack interacts with the original load-bearing beam, remove the jack, re-reinforce the enclosure and pour a grouting material layer into the enclosure. Finally, cut off the part of the original load-bearing column below the new load-bearing beam to achieve the purpose of column extraction.

[0030] Optionally, in S1, the jack adopts a specification with a cross-sectional dimension less than or equal to 10 cm. At the same time, the fulcrum of the jack and the crossbeam is close to the position of the column body.

[0031] By adopting the above technical solution, using a jack with a small cross-section can not only reduce the space occupied by the jack enclosure, but also facilitate the removal of the jack. At the same time, the fit between the jack and the original load-bearing beam is closer, further ensuring the safety of the unloading operation of the original load-bearing column on the original load-bearing beam.

[0032] Optionally, in S5, according to the design strength of the new load-bearing beam, the cross-sectional dimension of the outer mold is the same as that of the original load-bearing beam. In S6, a concrete pouring port is opened at the interface between the outer mold and the original load-bearing beam.

[0033] By adopting the above technical solution, if, according to the design strength, there is no need to increase the load on the original load-bearing beam, it is only necessary to extend the outer mold along the cross-section of the original load-bearing beam. After the commercial concrete is poured, the commercial concrete exposed outside the pouring port is knocked off.

[0034] Optionally, in S5, according to the design strength of the new load-bearing beam, the cross-sectional dimension of the outer mold is larger than that of the original load-bearing beam, and the original load-bearing beam is wrapped, and a concrete pouring port is opened on the floor slab.

[0035] By adopting the above technical solution, according to the design strength, the outer mold wraps both the original load-bearing beam and the jack, increasing the cross-section of the original load-bearing beam, thereby enhancing the load-bearing strength of the original load-bearing beam. Commercial concrete is poured into the outer mold from the floor slab to enhance the load-bearing strength of the new load-bearing beam.

[0036] Optionally, in S6, the strength grade of the poured concrete is higher than that of the original load-bearing column and the original load-bearing beam.

[0037] By adopting the above technical solution, the load-bearing strength of the new load-bearing beam is further enhanced.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. By using a jack to support and unload the original load-bearing column, the safety performance of the core drilling operation on the original load-bearing column is ensured. The jack is protected and supported by the outer mold and the enclosure. After pouring commercial concrete into the range between the outer mold and the enclosure and the through hole, after removing the jack, grout is poured into the enclosure space to further ensure the load-bearing strength of the new load-bearing beam and facilitate the subsequent column extraction operation;

[0040] 2. The inclined setting of the enclosure plate facilitates the support of the jack and the removal of the jack. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1It is a schematic diagram of the overall structure of the first embodiment of the present application;

[0042] Figure 2 It is a partial sectional view of the first embodiment of the present application;

[0043] Figure 3 It is a construction step diagram of the second embodiment of the present application.

[0044] Reference numerals: 1, support base; 2, jack; 3, through hole; 4, concrete layer; 5, steel mesh; 6, outer mold; 7, enclosure; 8, steel support; 9, original load-bearing column; 10, original load-bearing beam. Detailed implementation manners

[0045] The following further describes the present application in detail with reference to the attached Figures 1-3 drawings.

[0046] Embodiment 1

[0047] The first embodiment of the present application discloses a frame structure unloading and column extraction structure. Referring to Figure 1 , the frame structure unloading and column extraction structure includes three support bases 1 and jacks 2 installed on the support bases 1. The support bases 1 are composed of steel supports 8. The steel supports 8 are placed on the ground, and the jacks 2 are placed on the tops of the steel supports 8. The output ends of the jacks 2 are abutted against the original load-bearing beam 10. The position where the jacks 2 are abutted against the original load-bearing beam 10 is close to the original load-bearing column 9. Under the supporting action of the jacks 2, the three original load-bearing beams 10 around the original load-bearing column 9 unload the load-bearing effect of the original load-bearing column 9 on the original load-bearing beam 10.

[0048] Referring to Figure 1 and Figure 2 , core drilling is performed on the original load-bearing column 9 on the side without the jack 2 to form through holes 3. The original load-bearing column 9 is provided with two orthogonal through holes 3. Immediately, steel supports 8 and jacks 2 are used for support, and the steel supports 8 and jacks 2 in the other direction are disassembled, and core drilling is performed along its direction. The through holes 3 are arranged in a penetrating manner, and the length direction of the through holes 3 is the same as the length direction of the original load-bearing beam 10. A concrete layer 4 is poured into the original load-bearing column 9 in the through holes 3, and the strength grade of this concrete layer 4 is one grade higher than the concrete strength grade of the original load-bearing column 9; after the concrete layers 4 are poured into the two through holes 3 to form a new load-bearing beam, at this time, all four jacks 2 are supported against the original load-bearing beam 10.

[0049] Meanwhile, in order to further ensure the load-bearing strength of the new load-bearing beam, the original load-bearing beam 10 is connected with a steel mesh 5. After the original load-bearing beam 10 is penetrated and provided with fixing holes, pull bolts are inserted into the fixing holes. Through the welding fixation between the pull bolts and the steel mesh 5, a fixing component for facilitating the disassembly of the jack 2 is arranged in the steel mesh 5. The fixing component includes an outer mold 6 and an enclosure 7, which includes a plurality of enclosing plates connected end to end. The enclosing plates are connected with the steel mesh 5. The outer mold 6 includes a plurality of templates connected end to end. The templates are connected with the steel mesh 5. The jack 2 is located in the space enclosed by the plurality of enclosing plates. The outer mold 6 is wrapped outside the enclosure 7. The vertically arranged enclosing plates are inclined gradually downward along the vertical direction towards the jack 2, that is, the opening size of one end of the enclosure 7 close to the original load-bearing beam 10 is larger than that of the other end, so as to achieve the purpose of supporting the jack 2.

[0050] Refer to Figure 1 and Figure 2 , the space between the template and the enclosing plate is filled with a commercial concrete layer. The strength grade of the commercial concrete layer is one grade higher than that of the concrete of the original load-bearing column 9. After the commercial concrete layer is cured and maintained, the outer mold 6 is removed, and the enclosing plate at the bottom of the jack 2 is removed. The jack 2 and the original load-bearing beam 10 are made to exert mutual force, and the jack 2 is extruded from the enclosure 7 and drops from the lower part of the enclosure 7, completing the operation of disassembling the jack 2.

[0051] In order to further enhance the bearing strength of the new load-bearing beam, grouting material is poured into the inner cavity of the enclosure 7 to form a grouting material layer. The grouting material adopts high-strength non-shrinking grouting material, which is composed of high-strength materials as aggregates, cement as a binder, and is supplemented with high fluidity, micro-expansion and other substances. Due to the micro-expansion and high fluidity properties of the grouting material, it is ensured that the grouting material layer is tightly filled in the enclosure 7 and the connection with the enclosing plate is more stable, enhancing the load-bearing strength of the new load-bearing beam.

[0052] The implementation principle of the unloading and column extraction structure of a frame structure in an embodiment of the present application is as follows: Select three sides of the original load-bearing column 9, install steel supports 8, complete the construction of the support base 1, install the jack 2 at the top of the steel support 8, and the output end of the jack 2 abuts against the original load-bearing beam 10; After core drilling the original load-bearing column 9, immediately support it with the jack 2, remove the jack 2 and the steel support 8 in the other direction, and perform core drilling along this direction until the four directions of the original load-bearing column 9 are completely drilled through. The original load-bearing beam 10 is connected with the steel mesh 5. At the same time, after enclosing the jack 2 with the enclosure 7 and supporting the outer mold 6, pour the concrete layer 4 between the outer mold 6 and the enclosure 7 and into the through hole 3, then remove the outer mold 6 and the enclosing plate at the bottom of the jack 2. After the jack 2 and the original load-bearing beam 10 interact with each other, the jack 2 is removed. After re-reinforcing the enclosure 7, pour the grouting material layer into the enclosure 7. Finally, cut off the part of the original load-bearing column 9 below the new load-bearing beam to achieve the purpose of column extraction.

[0053] Example Two

[0054] This application example discloses a construction method for a frame structure unloading and column extraction structure. Referring to Figure 3 , the construction method for the frame structure unloading and column extraction structure includes the following steps,

[0055] S1. Unload the jack 2, build a steel support 8 platform to form a support seat 1, support three points of two original load-bearing beams 10 around the original load-bearing column 9. The jack 2 has a cross-sectional dimension less than or equal to 10 cm and a load capacity of 1 - 2 t. The position where the jack 2 abuts against the original load-bearing beam 10 is close to the original load-bearing column 9 to further ensure the safe progress of the unloading work of the original load-bearing column 9 on the original load-bearing beam 10 after drilling;

[0056] S2. Drill holes. Core drilling is carried out on the original load-bearing column 9 at the position below the cross beam to form a through hole 3. The through hole 3 is set to penetrate, and the length direction of the through hole 3 is along the length direction of one original load-bearing beam 10. After drilling, repeat the operation of building the steel support 8 in S1, and use the jack 2 to support the original load-bearing beam 10; Remove the jack 2 and the steel support 8 in the other direction, and carry out core drilling along this direction until the four directions of the original load-bearing column 9 are completely drilled through;

[0057] S3. Surround the jack 2 with a guard 7. After drilling and reinforcing the support beam, four enclosing plates surround the jack 2 for guarding 7. The space enclosed by the four enclosing plates gradually decreases from top to bottom; Here, according to the design strength, after drilling holes in the original load-bearing beam 10 and passing through tension bolts, the tension bolts are connected to the steel bars;

[0058] S4. Reinforcement binding. After reinforcement binding, a reinforcement mesh 5 is formed, and two layers of steel bars are arranged at the bottom of the reinforcement mesh 5 to increase the support strength of the reinforcement mesh 5;

[0059] S5. Install the external formwork 6. The external formwork 6 is formed by connecting multiple formworks outside the reinforcement mesh 5. According to the design strength, if it is necessary to expand the width dimension of the original load-bearing beam 10 after column extraction, the external formwork 6 will wrap the original load-bearing beam 10, and concrete is poured through an opening on the floor; If it is not necessary to expand the width dimension of the original load-bearing beam 10 after column extraction, the external formwork 6 is supported downward along the cross section of the original load-bearing beam 10. The cross-sectional dimension of the external formwork 6 is the same as that of the original load-bearing beam 10, and a concrete pouring port is provided at the interface between the external formwork 6 and the original load-bearing beam 10;

[0060] S6. Pour commercial concrete. Commercial concrete is poured into the through hole 3 and the gap between the external formwork 6 and the guard 7 to form a commercial concrete layer. The strength grade of this concrete is higher than that of the original load-bearing beam 10 and the original load-bearing column 9;

[0061] S7. Remove the external formwork 6. After the concrete is cured to the design strength, remove the external formwork 6;

[0062] S8. Jack out the jack 2. After removing the enclosure 7, control the jack 2 to jack out from within the enclosure 7. After the jack 2 has jacked out, reinforce the enclosure 7 and then pour grout into the enclosure 7 to form a grout layer;

[0063] S9. Pour grout. Pour grout into the enclosure 7. The grout has good fluidity and expansion performance and awaits curing;

[0064] S10. Remove the column. Non-destructively cut the column body of the original load-bearing column 9 located below the steel mesh 5 to form a new load-bearing beam.

[0065] The above are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. Construction method of a frame structure unloading and column extracting structure, Characterized in that: It includes a frame structure unloading and column extracting structure. The frame structure unloading and column extracting structure includes a plurality of support seats (1) and jacks (2) installed on the support seats (1). The output end of the jack (2) abuts against the original load-bearing beam (10); through holes (3) are provided orthogonally in the original load-bearing column (9). The length direction of the through holes (3) is the same as the length direction of the corresponding original load-bearing beam (10). A concrete layer (4) is poured in the original load-bearing column (9) within the through holes (3). The original load-bearing beam (10) is connected with a steel bar mesh (5). A fixing component for facilitating the removal of the jack (2) is arranged within the steel bar mesh (5); The fixing component includes an outer mold (6) and an enclosure (7). The enclosure (7) includes a plurality of enclosing plates connected end to end. The enclosing plates are connected with the steel bar mesh (5). The outer mold (6) includes a plurality of templates connected end to end. The jack (2) is located within the space enclosed by the enclosure (7). The gap between the outer mold (6) and the enclosure (7) is filled with a commercial concrete layer; the enclosing plates are gradually inclined towards the direction of the jack (2) in the vertical direction. The opening size of one end of the enclosure (7) close to the original load-bearing beam (10) is larger than that of the other end; It further includes the following steps, S1. Unload the jack (2), build steel supports (8), and support three points of two original load-bearing beams (10) around the original load-bearing column (9); S2. Drill holes. Core drilling is performed on the original load-bearing column (9) at the position below the original load-bearing beam (10) to form through holes (3), and immediately supported by the jack (2); Remove the jack (2) in the other direction, and perform core drilling along this direction until it is completely drilled through in four directions; S3. Enclose the jack (2) with the enclosure (7) around it. After drilling and reinforcing the original load-bearing beam (10), the four enclosing plates enclose the jack (2). The space enclosed by the four enclosing plates gradually decreases from top to bottom; S4. Bind steel bars. After binding the steel bars, a steel bar mesh (5) is formed; S5. Support the outer mold (6). The outer mold (6) is formed by connecting a plurality of templates outside the steel bar mesh (5); S6. Pour commercial concrete. Pour commercial concrete into the through holes (3) and the gap between the outer mold (6) and the enclosure (7) to form a commercial concrete layer; S7. Remove the outer mold (6). After the concrete is cured to the designed strength, remove the outer mold (6); S8. Remove the jack (2). After removing the enclosure (7), control the jack (2) to be jacked out from within the enclosure (7); S9. Pour grouting material. Pour grouting material into the enclosure (7); S10. Extract the column. Cut the column body of the original load-bearing column (9) below the steel bar mesh (5) without damage to form a new load-bearing beam.

2. The construction method of the frame structure unloading and column extracting structure according to claim 1, Characterized in that: A grouting material layer is poured in the inner cavity of the enclosure (7).

3. The construction method of the frame structure unloading and column extracting structure according to claim 1, Characterized in that: The support seat (1) is set as a steel support (8) placed on the ground.

4. The construction method of the frame structure unloading and column pulling structure according to claim 1, characterized in that: In S1, the jack (2) adopts a specification with a cross-sectional dimension less than or equal to 10 cm. At the same time, the fulcrum of the jack (2) and the original load-bearing beam (10) is close to the position of the original load-bearing column (9).

5. The construction method of the frame structure unloading and column pulling structure according to claim 1, characterized in that: In S5, according to the design strength of the new load-bearing beam, the cross-sectional dimension of the outer formwork (6) is the same as that of the original load-bearing beam (10). In S6, a concrete pouring port is opened at the interface between the outer formwork (6) and the original load-bearing beam (10).

6. The construction method of the frame structure unloading and column pulling structure according to claim 1, characterized in that: In S5, according to the design strength of the new load-bearing beam, the cross-sectional dimension of the outer formwork (6) is larger than that of the original load-bearing beam (10), and the original load-bearing beam (10) is wrapped, and a concrete pouring port is opened on the floor slab.

7. The construction method of the frame structure unloading and column pulling structure according to claim 1, characterized in that: In S6, the concrete strength grade of the poured concrete is higher than the concrete strength grades of the original load-bearing column (9) and the original load-bearing beam (10).

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