Latticed column deviation supporting joint and construction method

Abstract

The invention relates to the technical field of construction of subways, tunnels, constructional engineering and the like, in particular to a latticed column deviation supporting node and a construction method.The latticed column deviation supporting node comprises a supporting beam, a bracket beam and a latticed column, one side of the supporting beam is connected with one end of the bracket beam, and the bottom of the other end of the bracket beam is connected with the latticed column; the method is carried out according to the technological process of surveying and setting out, welding the latticed column, reading and measuring the elevation, welding the supporting plate 4, carrying out reinforcement checking calculation, binding reinforcing steel bars and pouring concrete. The problems that horizontal projections of the latticed column and the supporting beam do not coincide, and the supporting beam has few supporting points can be effectively solved, the problem of force transmission is solved by adding components, and it is ensured that stress is definite, and the structure is stable.

Description

Technical Field

[0001] The invention relates to the technical field of construction of subways, tunnels, building projects and the like, and in particular to an offset support node of a lattice column and a construction method thereof. Background Art

[0002] With the development and progress of economy and technology, the construction industry has developed rapidly. Developers have maximized the use of land and the area occupied by permanent structures to the greatest extent possible while meeting the setback requirements within the building red line. In order to ensure the safety of surrounding sites and underground municipal pipelines, government regulatory authorities have also strictly restricted the occupation of infrared land and required the protection of adjacent relationships. In order to reduce excavation and backfilling projects and shorten the construction period, construction units also tend to adopt support structures to ensure construction safety. In this context, the technology of internal support systems has been rapidly developed and applied. When the internal support is constructed over a large span, lattice column support is generally used to solve its own gravity. The cross-sectional size of the concrete support system is optimized through the spacing of lattice columns to reduce construction costs.

[0003] The lattice column is a temporary structure, and its foundation is the cast-in-place piles below the structural bottom plate. Its construction positioning is affected by many factors. During construction, it is necessary to avoid engineering piles, pedestal foundations, etc. At the same time, the positioning accuracy during construction and the influence of underground hidden bay areas will also cause construction deviation. The internal support beams need to remain straight. If the lattice column is not at the node of the main and secondary beams of the internal support, or even at both ends, it will seriously affect the stress of the structure and even cause major safety accidents such as support deformation and support collapse.

[0004] Based on the above reasons, the connection construction technology between the lattice column and the supporting beam is optimized to ensure the rationality and safety of the connection between the lattice column and the supporting beam. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a lattice column offset support node and a construction method to achieve the technical effect of solving the eccentric force of the lattice column and the support beam.

[0006] To achieve this technical purpose, the present invention adopts the following scheme: A lattice column offset support node comprises a support beam, a corbel beam and a lattice column, wherein one side of the support beam is connected to one end of the corbel beam, and the bottom of the other end of the corbel beam is connected to the lattice column.

[0007] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds a corbel beam between the column beam and the lattice column. The corbel beam and the support beam are an integrated structure. The lattice column supports the support beam by supporting the corbel beam, which effectively solves the problem of the force point being offset.

[0008] The preferred embodiment of the present invention is: The main reinforcement of the corbel is tied to the main reinforcement of the supporting beam, and the upper end of the lattice column extends to the main reinforcement of the corbel and is fixedly connected thereto.

[0009] A support plate is circumferentially arranged on the upper part of the lattice column below the connection node with the main reinforcement of the corbel beam, and the support plate is used to support the corbel beam.

[0010] The cross section of the corbel beam is the same as that of the supporting beam.

[0011] The present invention also relates to a lattice column offset support construction method, which is carried out according to the following steps: S1. Measure and lay out the lines. According to the construction drawings, locate and lay out the lines at the construction position of the support beam and count the deviation of the lattice column. S2, welded lattice columns; S3. Measure the bottom elevation of the supporting beam on the lattice column as the basis for positioning the corbel beam and as the bottom elevation of the supporting formwork at the bottom of the supporting beam; S4, welding the lattice column, and welding the support plate on the upper part of the lattice column according to the bottom elevation of the support beam in step 3; S5. Check the reinforcement of the corbel beam; S6. Tie the steel bars of the support beam and the corbel. When tying, tighten the two sides of the corbel on the support beam. S7. After the reinforcement is tied, concrete pouring is carried out. After the concrete reaches a certain strength, the formwork is removed.

[0012] The present invention can effectively solve the problem that the horizontal projections of the lattice column and the supporting beam do not overlap and the supporting beam has few fulcrums, and solves the problem of force transmission by adding components, ensuring clear force and stable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the reinforcement binding of the support beam and the corbel beam; Marked in the figure: 1. Support beam; 2. Corbel beam; 3. Lattice column; 4. Support plate. DETAILED DESCRIPTION

[0014] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figure 1 and 2 , the specific implementation methods of the present application are described in detail. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0015] A lattice column offset support node consists of a support beam 1, a corbel beam 2 and a lattice column 3, wherein one side of the support beam 1 and one end of the corbel beam 2 are cast as one piece, and the cross section of the corbel beam 2 is the same as that of the support beam 1; the bottom of the other end of the corbel beam 2 and the lattice column 3 are cast as an integral structure.

[0016] Before pouring, the main reinforcement of the corbel beam 2 is tied together with the main reinforcement of the support beam 1, and the upper end of the lattice column 3 extends into the main reinforcement of the corbel beam 2 and is welded and fixed to the main reinforcement.

[0017] The lattice column 3 is an angle steel lattice column 3 welded by angle steel and a gusset plate. Below the node where the upper part of the lattice column 3 is connected to the main reinforcement of the corbel beam 2, support plates 4 are welded along the outer periphery of the lattice column 3, and adjacent support plates 4 are welded and fixed. In this embodiment, the support plates 4 are cut from angle steel.

[0018] Based on the above content, the present invention is carried out according to the process flow of measuring and setting out - welding lattice columns - measuring elevation - welding support plates 4 - reinforcement verification - steel bar binding - concrete pouring, and the specific steps are as follows: S1. Measure and lay out. According to the construction drawings, locate and lay out the construction position of the support beam 1, count the deviation of the lattice columns, count the deviation size and number of the lattice columns, and determine the position and length of the corbel beams 2 required to be installed on both sides of the support beam 1.

[0019] S2. Welding lattice columns 3. The lattice columns 3 are angle steel lattice columns 3 welded by angle steels and tie plates.

[0020] S3. Measure the bottom elevation of the support beam 1 at the top of the lattice column 3. This elevation is used as the basis for positioning the corbel beam 2 and as the bottom elevation of the bottom formwork of the support beam 1.

[0021] S4. According to the bottom elevation of the support beam 1 in step S3, a support plate 4 is welded on the upper part of the lattice column 3. There are four support plates 4 on the upper part of each lattice column 3, and the support plates 4 are welded to form a whole. The support plate 4 in this embodiment is L140x12 and has a length of 480 mm.

[0022] S5. Verification of reinforcement of corbel 2. Because corbel 2 is short and the centerline of column-beam is 1.5m away from the center of lattice column 3, the main calculations are eccentric loading of main beam and lattice column 3, shear resistance of corbel 2 and structural safety and stability under adverse torsional shear loads on column-beam.

[0023] S6. After the reinforcement calculation of corbel 2 is completed, the reinforcement of support beam 1 and corbel 2 is tied. During the tying, the main reinforcement of corbel 2 is inserted into the main reinforcement of support beam 1 and tied together with the main reinforcement of support beam 1, and the two sides of the main reinforcement of corbel 2 on support beam 1 are tightened and tied densely, and the steel bar installation is completed according to the calculated reinforcement.

[0024] S7. After the reinforcement is tied, concrete pouring is carried out. After the concrete reaches a certain strength, the formwork is removed.

[0025] The present invention adds a corbel beam 2 between the support beam and the lattice column 3. The cross-sectional size of the corbel beam 2 is the same as that of the support beam 1. The eccentric stress stability of the support beam 1 and the lattice column 3 is verified by calculation software. It is empirically calculated that the reinforcement of the support beam 1 is @100, which can meet the strength requirements of the corbel beam 2 such as bending resistance and shear resistance. The lattice column 3 adds a peripheral support plate 4 at the bottom elevation of the corbel beam 2. The support plate 4 supports the steel bars of the corbel beam 2 and reduces the shearing effect of the lattice column 3 on the corbel beam 2.

[0026] Finally, it should be noted that the above are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.

Claims

1. A lattice column offset support node, characterized in that: It comprises a supporting beam, a corbel beam and a lattice column. One side of the supporting beam is connected to one end of the corbel beam, and the bottom of the other end of the corbel beam is connected to the lattice column.

2. The lattice column offset support node according to claim 1, characterized in that: The main reinforcement of the corbel is tied to the main reinforcement of the supporting beam, and the upper end of the lattice column extends to the main reinforcement of the corbel and is fixedly connected thereto.

3. The lattice column offset support node according to claim 2, characterized in that: A support plate is circumferentially arranged on the upper part of the lattice column below the connection node with the main reinforcement of the corbel beam, and the support plate is used to support the corbel beam.

4. The lattice column offset support node according to claim 1, characterized in that: The cross section of the corbel beam is the same as that of the supporting beam.

5. A construction method for offset support of a lattice column according to any one of claims 1 or 4, characterized in that: Follow these steps: S1. Measure and lay out the lines. According to the construction drawings, locate and lay out the lines at the construction position of the support beam and count the deviation of the lattice column. S2, welded lattice columns; S3. Measure the bottom elevation of the supporting beam on the lattice column as the basis for positioning the corbel beam and as the bottom elevation of the supporting formwork at the bottom of the supporting beam; S4, welding the lattice column, and welding the support plate on the upper part of the lattice column according to the bottom elevation of the support beam in step 3; S5. Check the reinforcement of the corbel beam; S6. Tie the steel bars of the support beam and the corbel. When tying, tighten the two sides of the corbel on the support beam. S7. After the reinforcement is tied, concrete pouring is carried out. After the concrete reaches a certain strength, the formwork is removed.

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