High-clearance lower diagonal bracing type joist column replacement construction method

Abstract

The invention discloses a high-clearance lower diagonal bracing type joist column replacement construction method, which is characterized in that a diagonal bracing structure is arranged to connect a beam and a column, prestress is provided through an electric jack, the beam is fastened, the purpose of gradually dismantling the structural column is achieved, and the method is convenient to construct, simple in measure and high in construction efficiency. The operation difficulty of high-clearance lower joist column replacement construction can be well controlled, the construction efficiency is high, and the construction cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of reinforcement and reconstruction construction, and in particular to a high-clearance lower diagonal bracing type beam-supporting column replacement construction method. Background Art

[0002] With the rapid development of society, early buildings are also aging, and people's requirements for the experience of buildings are getting higher and higher, and the problems of old buildings are becoming increasingly prominent. Due to the cumbersome procedures for demolition and reconstruction, many old buildings are renovated by reinforcement and transformation. Among them, because people have increasingly broad requirements for the space used by people in many public buildings, axis network transformation is also a common transformation method in reinforcement and transformation projects, and the construction of beam replacement is also the most complex transformation content. Especially under high clearance construction conditions, the technical measures for beam replacement will increase sharply. Summary of the invention

[0003] In view of the above problems, the present invention provides a construction method for replacing columns with beams under high clearance and with inclined support plates, in which inclined support plates are arranged to connect beams and columns, and prestress is provided by electric jacks to remove columns and tighten beams. This method is convenient to construct and has simple measures. It can better control the operational difficulty of replacing columns with beams under high clearance and has high construction efficiency and greatly reduced construction costs.

[0004] A high clearance lower diagonal bracing type beam-replacing column construction method, the steps comprising:

[0005] S1. Anchor the column connecting plate around the upper part of the structural column, anchor the beam connecting plate on the web of the beam connected to the upper end of the structural column and symmetrically relative to the structural column, and set an oblique support structure between the beam connecting plate and the column connecting plate;

[0006] S2. Make the web ribs of the diagonal support structure support beam provide the same support force as the original structural column, and then remove the pre-removal area of ​​the structural column;

[0007] S3. Install a staggered space frame system of vertical and horizontal poles under the structural beam as the bottom support formwork;

[0008] S4. Roughen the structural beam, set through-screw eyes, reserve holes for embedding steel bars, and apply embedding glue. Arrange reinforcing steel bars around the upper chord side, the rib side, and the lower chord side of the structural beam. Then, insert the through-screw rods through the through-screw eyes to fasten the formwork on the rib side of the structural beam. Install the bottom formwork on the lower chord side of the structural beam. Finally, pour concrete in the space formed by the formwork.

[0009] S5. According to the strength and design requirements, gradually remove the fastening structures and reinforcing braces at the bottom and both sides of the beam, and finally remove the remaining structural columns.

[0010] The oblique support structure comprises: an upper column connecting a beam connecting plate, a lower column connecting a column connecting plate, and an electric jack connecting the lower end of the upper column and the lower end of the lower column through fasteners.

[0011] The steps include operating the electric jack to extend the electric jack.

[0012] The present invention provides a high-clearance oblique support type beam-column replacement construction method, sets an oblique support structure and uses electric jacks instead of structural columns to provide support force for the beam, and performs structural tightening and strength improvement on the original structural beam, thereby achieving the purpose of gradually removing the structural columns. The operational difficulty of high-clearance beam-column replacement construction can be better controlled, and the influence of reinforced support on subsequent renovation construction is avoided, so the construction efficiency is high and the construction cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the inclined support structure;

[0014] Figure 2 This is a schematic diagram of the column connecting plate connection;

[0015] Figure 3 This is the overall schematic diagram of the beam structure reinforcement connection;

[0016] Figure 4 Schematic diagram of the beam structure reinforcement connection section. DETAILED DESCRIPTION

[0017] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0018] A high clearance lower diagonal bracing type beam-replacing column construction method, the steps comprising:

[0019] S1. Anchor the column connecting plate 1 around the upper part of the structural column, anchor the beam connecting plate 10 at the belly rib of the beam connected to the upper end of the structural column and symmetrically relative to the structural column, and set an oblique support structure between the beam connecting plate 10 and the column connecting plate 1, the oblique support structure includes: an upper column 8 connected to the beam connecting plate 10, a lower column 9 connected to the column connecting plate 1, and an electric jack 7 connected to the lower end of the upper column 8 and the lower end of the lower column 9 by fasteners;

[0020] S2. The oblique support structure supports the web ribs of the structural beam through the electric jack 7, providing the same support force as the original structural column 2, and then removing the pre-removal area of ​​the structural column;

[0021] S3. Install the vertical poles 18 and horizontal poles 20 below the structural beam in a staggered space frame system as the bottom support formwork;

[0022] S4. The structural beam 11 is roughened, a through-screw eye is set, and a rebar embedding glue is applied after a pre-reserved rebar embedding hole is used. The reinforcing steel bars 15 are arranged around the upper chord side, the rib side, and the lower chord side of the structural beam. Then, the drawing rods 21 are inserted through the through-holes to fasten the formwork on the rib side of the structural beam, and the bottom formwork is installed on the lower chord side of the structural beam. Finally, concrete is poured in the space formed by the formwork.

[0023] S5. According to the strength and design requirements, gradually remove the fastening structure and inclined support structure on the lower chord side and the two rib sides of the structural beam, and finally remove the remaining structural columns.

[0024] Further, if Figure 1 As shown, in step S1, column connecting plates 1 are anchored on four sides of the upper part of the structural column 2, and beam connecting plates 10 are symmetrically anchored on the belly rib part of the structural beam 11 with the structural column 2 as the center line. An inclined support structure is arranged between the beam connecting plate 10 and the column connecting plate 1, and the inclined support structure includes an upper column 8, a lower column 9 and an electric jack 7. The electric jack 7 is arranged in the middle of the inclined support structure, and both ends of the electric jack 7 are welded to the embedded plate 5. One end of the upper column 8 is welded to the beam connecting plate 10, and the other end is welded to the embedded plate 5. One end of the lower column 9 is welded to the column connecting plate 1, and the other end is welded to the embedded plate 5. The embedded plate 5 connected to the upper column 8 and the embedded plate 5 connected to the upper end of the electric jack 7 are connected by bolts 6, and the embedded plate 5 connected to the lower column 9 and the embedded plate 5 connected to the upper end of the electric jack 7 are connected by bolts 6.

[0025] The column connecting plate 1 and the beam connecting plate 10 are anchored on the structural column and the structural beam in the following manner: Figure 2 As shown, before installing the column connecting plate 1 and the beam connecting plate 10, first use an electric pick to chisel off the structural protective layer to the main reinforcement 13 at the position where the column connecting plate 1 is installed on the structural column 2 and the position where the beam connecting plate 10 is installed on the structural beam 11, and then use an electric drill to drill through the screw holes on the structural column 2 and the structural beam 11, and insert the connecting screw 4 through the through screw holes. The column connecting plate 1 and the beam connecting plate 10 are installed on both sides of the connecting screw 4 through double fastening nuts. Finally, the structural glue 14 is injected into the grouting area in the gap between the column connecting plate 1 and the beam connecting plate 10 and the structural joint. In this embodiment, the through screw hole diameter is 27mm, and the connecting screw 4 diameter is 25mm. The connecting screw 4 diameter is not larger than the screw hole diameter, and the connecting screw 4 length is larger than the thickness of the column connecting plate 1 and the beam connecting plate 10.

[0026] After the installation of the oblique support structure is completed, the oblique support structure is extended by an electric jack so that the oblique support structure applies the same prestress to the structural beam as the supporting force of the original structural column 2. Then, the pre-removed area 12 of the structural column above the column connecting plate 1 is removed to the required construction height, and the remaining part of the structural column 2 and the oblique support structure are used to continue to provide the beam supporting force.

[0027] Specifically, in this embodiment, the column connecting plate 1 is a steel plate with a height of 800 mm, a width equal to the column width, and a thickness of 20 mm. A row of holes with a diameter of 27 mm is provided on the upper and lower sides of the column connecting plate 1. The beam connecting plate 10 is a steel plate with a height of 300 mm, a width of 400 mm, and a thickness of 20 mm. The beam connecting plate 10 has a row of holes with a diameter of 27 mm. The upper column 8 and the lower column 9 are both made of 12# square steel pipes.

[0028] Further, step S3 includes: Figure 3 As shown, a bottom supporting formwork consisting of a space frame system of vertical and horizontal bars 18 and vertically staggered vertical bars is provided below the structural beam. The vertical bars 18 and the horizontal bars 20 are connected by steel pipes and fasteners. The uppermost horizontal bar of the supporting formwork is used as a beam bottom bracket 17. A secondary keel 19 is connected to the upper portion of the bracket 17. A formwork 16 is connected to the upper portion of the secondary keel 19. The bracket 17 is fastened to the secondary keel 19 and the formwork 16.

[0029] Further, step S4 includes, after removing the column pre-removal area 12, using an electric pick to roughen the upper chord side, lower chord side, and rib side of the original structural beam as a whole, and then using an electric drill to set through screw eyes along the ribs on both sides of the beam, and reserving holes for embedding steel bars, and then applying embedding glue to the reinforcing steel bars 15 and surrounding them around the upper chord side, lower chord side, and rib side of the structural beam, and fastening and binding the reinforcing steel bars 15 to the structural beam. The structural strength of the structural beam is improved by adding the reinforcing steel bars 15. In this embodiment, the diameter of the through screw eyes is 16 mm.

[0030] Then, the formwork 16 and the main keel 18 are installed on the two rib sides and one lower chord side of the structural beam, and the plastic sleeve 22 is inserted into the reserved tension screw eye to make the tension rod 21 pass through the formwork 16, the main keel and the plastic sleeve 22 on the rib side of the structural beam. Butterfly buckles 24 are connected to both ends of the tension rod 21. The tension rod 21 and the butterfly buckle 24 are used to fasten the main keel 18 and the formwork 16 on the two rib sides of the structural beam to the structural beam, and finally concrete is poured in the space surrounded by the formwork 16.

[0031] Specifically, after the structural beam is tightened as a whole, the overall structural strength of the reinforced beam is measured and calculated. When the strength meets the requirements, the reinforcement formwork on the front and rear sides of the beam is removed first, and the wire drawing rods can be removed and recycled. After the structural beam meets the design requirements, the support formwork on the lower chord side of the structural beam and the inclined support structure on the rib side are removed, and finally the remaining two parts of the structural column are completely removed.

[0032] The above description describes a preferred embodiment of the present invention and should not be regarded as limiting the scope of protection of the claims of the present invention. Any modification, equivalent substitution and improvement without departing from the principle and spirit of the present invention should be regarded as within the scope of protection of the claims of the present invention.

Claims

1. A high clearance lower diagonal bracing type beam-replacing column construction method, characterized in that: The steps include: S1. Anchor the column connecting plate around the upper part of the structural column, anchor the beam connecting plate on the web of the beam connected to the upper end of the structural column and symmetrically relative to the structural column, and set an oblique support structure between the beam connecting plate and the column connecting plate; S2. Make the web ribs of the diagonal support structure support beam provide the same support force as the original structural column, and then remove the pre-removal area of ​​the structural column; S3. Install a staggered space frame system of vertical and horizontal poles under the structural beam as the bottom support formwork; S4. Roughen the structural beam, set through-screw eyes, reserve holes for embedding steel bars, and apply embedding glue. Arrange reinforcing steel bars around the upper chord side, the rib side, and the lower chord side of the structural beam. Then, insert the through-screw rods through the through-screw eyes to fasten the formwork on the rib side of the structural beam. Install the bottom formwork on the lower chord side of the structural beam. Finally, pour concrete in the space formed by the formwork. S5. According to the strength and design requirements, gradually remove the fastening structures and reinforcing braces at the bottom and both sides of the beam, and finally remove the remaining structural columns.

2. A high clearance lower diagonal bracing type beam-replacing column construction method according to claim 1, characterized in that: The oblique support structure comprises: an upper column connecting a beam connecting plate, a lower column connecting a column connecting plate, and an electric jack connecting the lower end of the upper column and the lower end of the lower column through fasteners.

3. A high clearance lower diagonal bracing type beam-replacing column construction method according to claim 1, characterized in that: The steps include operating the electric jack to extend the electric jack.

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