Construction method of steel roof lower column top reinforced shear-resistant structure

Abstract

The application discloses a construction method of a reinforced shear-resistant structure of a column top under a steel roof, and the reinforced shear-resistant structure comprises a reinforced concrete column under a roof truss, a reinforced concrete beam connected to a lateral side of an upper portion of the reinforced concrete column, a shear-resistant embedded part connected between the roof truss and the reinforced concrete column, and pre-connected middle slab pre-connected anchor bars and side slab pre-connected anchor bars connected to the shear-resistant embedded part. The column top and the reinforced concrete beam to be poured are connected through the setting of the shear-resistant embedded part, and are fixedly connected with the support to form an integrated connection. The setting of the embedded side clamping plate and the embedded vertical plate is beneficial to guarantee the insertion of the shear-resistant embedded part, guarantee the shear-resistant stress at the column top to meet the design requirements and facilitate the construction. The setting of the anchor bars, the pre-reserved single bar hole and the pre-reserved bar adjusting hole is beneficial to guarantee the anchoring of the shear-resistant part by using the original binding steel bars in the reinforced concrete column, and is beneficial to more effective anchoring when the steel bars at the column top sealing head are densely bound.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structures, and in particular relates to a construction method of a column top reinforced shear-resistant structure under a steel roof. Background Art

[0002] Shear keys are installed when shear forces exceed the friction between the column base and the concrete. Typically, thicker steel plates or I-beams are welded vertically to the horizontal steel plate at the base of the column base and embedded in a pre-reserved shear groove within the concrete foundation. This resists shear forces at the base of the column and prevents slippage between the column base plate and the concrete top surface. In actual construction, shear failure of column base bolts occurs within the concrete foundation, making it difficult to detect and, often, to implement reinforcement measures. Therefore, the design of shear keys in steel structures is crucial to the overall design of the steel structure.

[0003] In existing buildings, the connections between prefabricated components, particularly prefabricated beam-column connections, often play a decisive role in structural performance, such as load-bearing capacity, structural stiffness, and seismic resistance. These connections profoundly impact the feasibility and construction methods of precast concrete frame structures. However, overcrowding rebar at beam-column joints can leave insufficient space for shear key installation. This is especially true when shear key connections are located beneath the roof, necessitating a targeted design to ensure shear strength while maintaining a secure connection to the upper structure. Summary of the Invention

[0004] The present invention provides a construction method for a column top reinforced shear resistant structure under a steel roof, which is used to solve technical problems such as anchoring, installation and connection of shear resistant members at column top beam-column nodes with the top structure.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A construction method for a reinforced shear-resistant structure at the top of a steel roof column, the reinforced shear-resistant structure comprising a reinforced concrete column under a roof truss, a reinforced concrete beam connected to the upper side of the reinforced concrete column, shear-resistant embedded parts connected between the roof truss and the reinforced concrete column, and pre-connected middle plate anchor bars and side plate anchor bars pre-connected to the shear-resistant embedded parts.

[0007] The anti-shear embedded part includes an anti-embedded horizontal plate, anti-embedded side clamping plates connected to both sides of the anti-embedded horizontal plate, anti-embedded vertical plates respectively connected to the side edges of the anti-embedded clamping plates, anchor bar horizontal plate holes and anchor bar side plate holes are provided on the anti-embedded horizontal plate, and reserved single bar holes and reserved bar adjustment holes are also provided on the anti-embedded horizontal plate;

[0008] The construction method of the reinforced shear-resistant structure at the top of the column under the steel roof is applied. The specific steps are as follows:

[0009] Step 1: Based on the support points installed under the roof trusses, determine the location of the shear embedment at the top of the reinforced concrete columns;

[0010] Step 2: The binding steel bars inside the reinforced concrete column are densely arranged at the top of the column, and the head steel bars are bent. Among the steel bars to be bent, there are steel bars corresponding to the steel bars that pass through the shear embedded parts;

[0011] Step 3: Prefabricate the shear-resistant embedded parts, wherein the embedded horizontal plate is welded or integrally formed by two embedded horizontal side plates and an embedded horizontal middle plate, and reserved single reinforcement holes and reserved reinforcement adjustment holes are set on the embedded horizontal middle plate; wherein the reserved single reinforcement holes and reserved reinforcement adjustment holes correspond to the steel bars to be passed through in the head reinforcement;

[0012] Step 4: Weld the anti-embedding side plates and the anti-embedding vertical plates below the two anti-embedding horizontal side plates, respectively. The spacing between the inner walls of the two anti-embedding vertical plates corresponds to the outer wall of the reinforced concrete column and is inserted into the first reinforced concrete beam or the second reinforced concrete beam.

[0013] Step 5: Anchor bars are pre-welded on the anti-buried horizontal side plates and the anti-buried horizontal middle plates, and the anchor bars are symmetrically arranged about the center of the reinforced concrete column;

[0014] Step 6: During the installation process, the anchor bars are inserted into the reinforced concrete columns and reinforced concrete beams, and the bent column steel bars to be connected are inserted into the reserved single bar holes and reserved adjustment bar holes;

[0015] Step 7: The anti-embedded horizontal side plates are overlapped on the reinforced concrete beams, and the anti-embedded horizontal middle plates are pre-connected to the top of the reinforced concrete columns and connected to the roof trusses through supports.

[0016] Furthermore, the reinforced concrete beam includes at least a first reinforced concrete beam and a second reinforced concrete beam, and the steel bars of the first reinforced concrete beam and the second reinforced concrete beam are tied at the reinforced concrete columns to adapt to the insertion of anti-embedded side splints and anti-embedded vertical plates.

[0017] Furthermore, the anchor bars include middle plate pre-connected anchor bars and side plate pre-connected anchor bars, and the middle plate pre-connected anchor bars are arranged at least in the center of the anti-buried horizontal middle plate and are arranged in a plum blossom shape.

[0018] Furthermore, the horizontal plate holes and side plate holes of the anchor bars are pre-drilled, and the anchor bars corresponding to the horizontal plate holes and side plate holes of the anchor bars are welded and connected; the height of the anchor bars is combined with the steel bars to be passed through in the head steel bars, and the anchoring strength of the two adapts to the designed anchoring strength of the shear-resistant embedded parts.

[0019] Furthermore, the reserved single reinforcement holes are circular holes and are symmetrically arranged around the anchor reinforcement horizontal plate holes; the reserved reinforcement adjustment holes are elliptical holes and are arranged at the four corners of the anti-embedding horizontal middle plate; two steel bars are passed through the reserved reinforcement adjustment holes.

[0020] Furthermore, the support is a spherical support, the top of the support is connected to the lower chord of the roof truss through a partition, and the bottom of the support is flat and fixed to the top of the anti-buried horizontal middle plate.

[0021] Furthermore, the anti-embedded side splints are arranged in groups, each group comprising two parallel straight plates, and the two straight plates are connected below the anti-embedded horizontal side plate at one end; the spacing between the two straight plates is smaller than the width of the reinforced concrete beam and is suitable for being inserted into the formwork of the reinforced concrete beam to be cast.

[0022] Furthermore, the anti-embedding vertical plates are vertically connected to each linear plate, and the distance between the anti-embedding vertical plates of the corresponding anti-embedding horizontal side plates is correspondingly connected to the outer wall of the reinforced concrete column.

[0023] Furthermore, the anti-embedded side plywood on one side is horizontally spaced with anti-embedded stiffening plates, which are connected to the middle and upper part of the anti-embedded side plywood and the distance between the bottom surface and the bottom surface of the anti-embedded side plywood is adapted to the depth of the anti-embedded horizontal side plate inserted into the reinforced concrete beam.

[0024] The beneficial effects of the present invention are embodied in:

[0025] 1) The present invention connects the column top and the reinforced concrete beam to be cast by providing an anti-shear embedded part, and the top of the anti-shear embedded part is fixedly connected to the support, further forming an integral connection with the roof truss;

[0026] 2) The present invention facilitates the connection of the anti-shear embedded components with the reinforced concrete columns and reinforced concrete beams by providing the anti-embedded side plates and anti-embedded vertical plates, ensuring that the shear force at the column top meets the design requirements and facilitating construction.

[0027] 3) The present invention facilitates the anchoring of the shear member by utilizing the existing reinforced concrete column binding steel bars through the provision of anchor bars, reserved single bar holes, and reserved bar adjustment holes, thereby facilitating more effective anchoring when densely tying steel bars at the column top cap.

[0028] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention; the main purpose and other advantages of the present invention can be realized and obtained through the solutions particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the reinforced shear-resistant structure at the top of the column under the steel roof;

[0030] Figure 2 It is the side view of the shear embedment;

[0031] Figure 3 It is the top view of the shear embedment;

[0032] Figure 4 This is a three-dimensional diagram of shear-resistant embedded parts Figure 1 ;

[0033] Figure 5 This is a three-dimensional diagram of shear-resistant embedded parts Figure 2 .

[0034] Figure markings: 1-reinforced concrete column, 2-reinforced concrete beam, 21-first reinforced concrete beam, 22-second reinforced concrete beam, 3-support, 4-roof truss, 5-shear embedded parts, 51-anti-embedded horizontal plate, 511-anti-embedded horizontal side plate, 512-anti-embedded horizontal middle plate, 52-anti-embedded side splint, 53-anti-embedded vertical plate, 54-anti-embedded stiffening plate, 55-anchor bar horizontal plate hole, 56-anchor bar side plate hole, 57-reserved single bar hole, 58-reserved adjustment bar hole, 6-middle plate pre-connected anchor bar, 7-side plate pre-connected anchor bar. DETAILED DESCRIPTION

[0035] Taking a steel structure roof as an example, the truss and the column are connected by supports. In order to ensure the shear resistance requirements at the column top, the reinforced shear resistance structure at the column top under the steel roof is constructed. Figures 1 to 5 As shown, the reinforced shear-resistant structure of the column top under the steel roof includes a reinforced concrete column 1 under the roof truss 4, a reinforced concrete beam 2 connected to the upper side of the reinforced concrete column 1, a shear-resistant embedded part 5 connected between the roof truss 4 and the reinforced concrete column 1, and a pre-connected middle plate anchor bar 6 and a pre-connected side plate anchor bar 7 connected to the pre-connected shear-resistant embedded part 5;

[0036] In this embodiment, the anti-shear embedded part 5 includes an anti-embedded horizontal plate 51, anti-embedded side splints 52 connected to both sides of the anti-embedded horizontal plate 51, anti-embedded vertical plates 53 respectively connected to the side edges of the anti-embedded splints, anchor bar horizontal plate holes 55 and anchor bar side plate holes 56 are provided on the anti-embedded horizontal plate 51, and reserved single bar holes 57 and reserved adjustment bar holes 58 are also provided on the anti-embedded horizontal plate 51.

[0037] Combine Figures 1 to 5 As shown in the figure, the construction method of the column top reinforced shear structure under the steel roof is further explained. The specific steps are as follows:

[0038] Step 1: Based on the 3-point position of the support installed under the roof truss 4, determine the position of the shear embedment 5 on the top of the reinforced concrete column 1.

[0039] Step 2: The binding steel bars inside the reinforced concrete column 1 are densely arranged at the top of the column, and the head steel bars are bent. Among the steel bars to be bent, there are steel bars corresponding to those that pass through the shear-resistant embedded parts 5.

[0040] Step three: pre-fabricate the shear-resistant embedded parts 5, wherein the anti-embedded horizontal plate 51 is welded or integrally formed by two anti-embedded horizontal side plates 511 and an anti-embedded horizontal middle plate 512, and reserved single-rebar holes 57 and reserved reinforcement adjustment holes 58 are set on the anti-embedded horizontal middle plate 512; wherein, the reserved single-rebar holes 57 and the reserved reinforcement adjustment holes 58 correspond to the steel bars to be passed through in the head reinforcement.

[0041] Step 4: Weld the anti-embedding side plates 52 and anti-embedding vertical plates 53 below the two anti-embedding horizontal side plates 511 respectively. The spacing between the inner walls of the two anti-embedding vertical plates 53 corresponds to the outer wall of the reinforced concrete column 1 and is inserted into the first reinforced concrete beam 21 or the second reinforced concrete beam 22.

[0042] Among them, the reinforced concrete beam 2 includes at least a first reinforced concrete beam 21 and a second reinforced concrete beam 22. The first reinforced concrete beam 21 and the second reinforced concrete beam 22 are reinforced at the reinforced concrete column 1 to adapt to the insertion of the anti-embedded side splint 52 and the anti-embedded vertical plate 53.

[0043] The anti-embedding side splints 52 are arranged in groups, each group comprising two parallel straight plates, the two straight plates being connected below the anti-embedding horizontal side plate 511 at one end; the spacing between the two straight plates is less than the width of the reinforced concrete beam 2 and adapted to be inserted into the formwork of the reinforced concrete beam 2 to be cast. The anti-embedding vertical plates 53 are vertically connected to each straight plate, and the distance between the anti-embedding vertical plates 53 of the corresponding anti-embedding horizontal side plates 511 corresponds to the outer wall of the reinforced concrete column 1. The anti-embedding side splints 52 on one side are horizontally spaced apart with anti-embedding stiffening plates 54, which are connected to the middle and upper part of the anti-embedding side splints 52 and the distance between the bottom surface and the bottom surface of the anti-embedding side splints 52 is adapted to the depth of insertion of the anti-embedding horizontal side plates 511 into the reinforced concrete beam 2.

[0044] Step 5: Anchor bars are pre-welded to the anti-buried horizontal side plates 511 and the anti-buried horizontal middle plate 512. The anchor bars are symmetrically arranged about the center of the reinforced concrete column 1. The anchor bars include the middle plate pre-connected anchor bar 6 and the side plate pre-connected anchor bar 7. The middle plate pre-connected anchor bar 6 is set at least in the center of the anti-buried horizontal middle plate 512 and is arranged in a plum blossom pattern.

[0045] Step 6: During the installation process, the anchor bars are inserted into the reinforced concrete column 1 and the reinforced concrete beam 2 , and the bent column reinforcement bars to be connected are inserted into the reserved single reinforcement holes 57 and the reserved reinforcement adjustment holes 58 .

[0046] Among them, the horizontal plate holes 55 of the anchor bars and the side plate holes 56 of the anchor bars are pre-drilled, and the anchor bars corresponding to the horizontal plate holes 55 of the anchor bars and the side plate holes 56 are welded and connected; the height of the anchor bars is combined with the steel bars to be passed through in the head steel bars, and the anchoring strength of the two is adapted to the designed anchoring strength of the shear-resistant embedded parts 5.

[0047] In this embodiment, the reserved single reinforcement hole 57 is a circular hole and is symmetrically arranged around the anchor reinforcement horizontal plate hole 55; the reserved reinforcement adjustment hole 58 is an elliptical hole and is arranged at the four corners of the anti-buried horizontal middle plate 512; two steel bars are passed through the reserved reinforcement adjustment hole 58.

[0048] Step 7: The anti-buried horizontal side plates 511 are overlapped on the reinforced concrete beam 2 , and the anti-buried horizontal middle plates 512 are pre-connected to the top of the reinforced concrete column 1 and connected to the roof truss 4 through the support 3 .

[0049] Among them, the support 3 is a spherical support 3, the top of the support 3 is connected to the lower chord of the roof truss 4 through a partition, and the bottom of the support 3 is a flat setting and is fixed to the top of the anti-buried horizontal middle plate 512.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a steel roof column top reinforced shear resistance structure, characterized in that: The reinforced shear-resistant structure of the column top under the steel roof comprises a reinforced concrete column (1) under the roof truss (4), a reinforced concrete beam (2) connected to the upper side of the reinforced concrete column (1), a shear-resistant embedded part (5) connected between the roof truss (4) and the reinforced concrete column (1), and a pre-connected middle plate anchor bar (6) and a pre-connected side plate anchor bar (7) connected to the pre-connected shear-resistant embedded part (5); The anti-shear embedded member (5) comprises an anti-embedded horizontal plate (51), anti-embedded side splints (52) connected to both sides of the anti-embedded horizontal plate (51), anti-embedded vertical plates (53) respectively connected to the side edges of the anti-embedded splints, anchor bar horizontal plate holes (55) and anchor bar side plate holes (56) are provided on the anti-embedded horizontal plate (51), and reserved single bar holes (57) and reserved bar adjustment holes (58) are also provided on the anti-embedded horizontal plate (51); The anti-embedding side splints (52) are arranged in groups, each group comprising two parallel straight plates, the two straight plates being connected below the anti-embedding horizontal side plate (511) at one end; the spacing between the two straight plates is smaller than the width of the reinforced concrete beam (2) and is adapted to be inserted into the formwork of the reinforced concrete beam (2) to be cast; The construction method of the reinforced shear-resistant structure at the top of the column under the steel roof is applied. The specific steps are as follows: Step 1: Based on the position of the support (3) installed under the roof truss (4), determine the position of the shear-resistant embedded part (5) installed on the top of the reinforced concrete column (1); Step 2: The internal binding steel bars of the reinforced concrete column (1) are densely arranged at the top of the column, and the head steel bars are bent, and the steel bars to be bent include steel bars corresponding to the shear-resistant embedded parts (5); Step 3: prefabricate the shear-resistant embedded part (5), wherein the embedded horizontal plate (51) is welded or integrally formed by two embedded horizontal side plates (511) and an embedded horizontal middle plate (512), and a reserved single reinforcement hole (57) and a reserved reinforcement adjustment hole (58) are provided on the embedded horizontal middle plate (512); wherein the reserved single reinforcement hole (57) and the reserved reinforcement adjustment hole (58) correspond to the reinforcement to be passed through the head reinforcement; Step 4: Welding the anti-embedding side plates (52) and the anti-embedding vertical plates (53) below the two anti-embedding horizontal side plates (511) respectively, wherein the spacing between the inner walls of the two anti-embedding vertical plates (53) corresponds to the outer wall of the reinforced concrete column (1) and is inserted into the first reinforced concrete beam (21) or the second reinforced concrete beam (22); Step 5: Anchor bars are pre-welded on the anti-buried horizontal side plates (511) and the anti-buried horizontal middle plates (512), and the anchor bars are symmetrically arranged about the center of the reinforced concrete column (1); Step 6: During the installation process, the anchor bars are inserted into the reinforced concrete column (1) and the reinforced concrete beam (2), and the columns to be connected are bent. The steel bars are correspondingly inserted into the reserved single reinforcement holes (57) and the reserved reinforcement adjustment holes (58); Step 7: The anti-buried horizontal side plate (511) is overlapped on the reinforced concrete beam (2), and the anti-buried horizontal middle plate (512) is pre-connected to the top of the reinforced concrete column (1) and connected to the roof truss (4) through the support (3).

2. The construction method of the column top reinforced shear resistance structure under the steel roof according to claim 1, characterized in that: The reinforced concrete beam (2) comprises at least a first reinforced concrete beam (21) and a second reinforced concrete beam (22); the first reinforced concrete beam (21) and the second reinforced concrete beam (22) are reinforced at the reinforced concrete column (1) and are adapted to be plugged into the anti-embedding side splint (52) and the anti-embedding vertical plate (53).

3. The construction method of the column top reinforced shear resistance structure under the steel roof according to claim 1, characterized in that: The anchor bars include middle plate pre-connected anchor bars (6) and side plate pre-connected anchor bars (7); the middle plate pre-connected anchor bars (6) are arranged at least at the center of the anti-buried horizontal middle plate (512) and are arranged in a plum blossom shape.

4. The construction method of the column top reinforced shear resistance structure under the steel roof according to claim 1, characterized in that: The anchor bar horizontal plate hole (55) and the anchor bar side plate hole (56) are pre-drilled, and the anchor bars corresponding to the anchor bar horizontal plate hole (55) and the anchor bar side plate hole (56) are welded. The height of the anchor bar is combined with the steel bar to be passed through the head steel bar, and the anchoring strength of the two is adapted to the designed anchoring strength of the shear embedment (5).

5. The construction method of the column top reinforced shear resistance structure under the steel roof according to claim 1, characterized in that: The reserved single reinforcement holes (57) are circular holes and are arranged symmetrically around the anchor reinforcement horizontal plate holes (55); the reserved reinforcement adjustment holes (58) are elliptical holes and are arranged at the four corners of the anti-buried horizontal middle plate (512); two steel bars are inserted into the reserved reinforcement adjustment holes (58).

6. The construction method of the reinforced shear-resistant structure of the column top under the steel roof according to claim 1, characterized in that: The support (3) is a spherical support (3), the top of the support (3) is connected to the lower chord of the roof truss (4) via a partition plate, and the bottom of the support (3) is flat and fixed to the top of the anti-buried horizontal middle plate (512).

7. The construction method of the reinforced shear-resistant structure of the column top under the steel roof according to claim 1, characterized in that: The anti-embedding vertical plates (53) are vertically connected to each linear plate, and the distance between the anti-embedding vertical plates (53) of the corresponding anti-embedding horizontal side plates (511) is correspondingly connected to the outer wall of the reinforced concrete column (1).

8. The construction method of the column top reinforced shear resistance structure under the steel roof according to claim 1, characterized in that: The anti-embedding side splint (52) on one side is connected to an anti-embedding stiffening plate (54) at intervals in the horizontal direction. The anti-embedding stiffening plate (54) is connected to the middle and upper part of the anti-embedding side splint (52) and the distance between the bottom surface and the bottom surface of the anti-embedding side splint (52) is adapted to the depth of the anti-embedding horizontal side plate (511) inserted into the reinforced concrete beam (2).

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