CN103993741B - The method of construction of brick formwork aseismatic structural column - Google Patents

Abstract

The invention relates to a method for building a brick formwork anti-seismic structural column, which belongs to the technical field of seismic design and construction of a masonry house, and includes the following steps: building a brick formwork and a brick wall, placing a steel bar skeleton, placing tie-bonded steel mesh sheets, and pouring concrete. The present invention adopts small-sized clay bricks to build the formwork, and can form the integrated formwork of the wall column and pour the reinforced concrete column at the joints of the cross-shaped, T-shaped, and L-shaped brick walls. The reinforced mesh sheet connects the reinforced concrete column and the ordinary size brick wall into a whole, which can effectively improve the seismic performance of the masonry structure. Compared with the structural columns in the current seismic code, the three types of structural columns developed have the characteristics of reduced cross-sectional area, larger boundary with the wall, and enhanced restraint on the wall. The use of new brick formwork instead of conventional steel-wood formwork can effectively reduce the cost of formwork and the construction period, and is conducive to the overall integration of structural columns and brick walls and the consistency of architectural appearance.

Description

Construction Method of Brick Formwork Shell Seismic Constructive Column

technical field

The invention relates to a method for constructing an anti-seismic structural column of brick formwork, and belongs to the technical field of anti-seismic design, reinforcement and construction of multi-storey masonry buildings.

Background technique

At present, most of my country's population lives in rural areas and towns, and most of the masonry houses they live in are not designed and constructed in accordance with earthquake resistance requirements. In the 2008 Wenchuan Earthquake, the masonry houses located in the intensity area of 6 degrees and above suffered severe damage, resulting in significant loss of life and property; one of the main reasons is that the current construction technology of seismic structural columns is complicated and cost High and difficult have been fully promoted and implemented. Optimizing the design and construction scheme of the current seismic structural columns and proposing simple and practical technological measures are important tasks for improving the seismic performance of masonry houses in villages and towns in my country and ensuring the safety of life and property.

According to my country's current "Code for Seismic Design of Buildings" GB50011-2010, multi-storey masonry buildings must be equipped with reinforced concrete seismic structural columns. The construction plan of the structural column is to reserve a chasm at the junction of the brick wall, use steel (wooden) formwork to erect the formwork along the chasm, bind the longitudinal steel skeleton of the structural column, and pour and maintain concrete in the formwork. The formwork process of this scheme is relatively complicated, and the quality is difficult to control. The construction on the second floor and the upper floor is more inconvenient, and it is easy to cause quality problems such as mold expansion, grout leakage, and concrete vibration. It is also inconsistent with the brick wall in appearance; in addition, the demand for formwork is large and the turnaround period is long, which increases the project cost. At present, there are many researches and patent applications on the improvement of seismic structural columns in China, but limited by various conditions, there are few practical applications.

Contents of the invention

The purpose of the present invention is to provide a construction method of brick formwork anti-seismic structural columns, which has the characteristics of good overall performance, low cost, simple construction, and easy promotion. Using new brick formwork instead of conventional steel-wood formwork can effectively Reduce the cost of vertical formwork and the construction period, which is conducive to the overall integration of structural columns and brick walls and the consistency of architectural appearance.

The purpose of the present invention is achieved through the following technical proposals: build the structural column brick formwork at the intersection of the wall and wall corners, set the structural column reinforcement skeleton in the brick formwork, and lay tie-bonded steel mesh between the structural column and the wall , pour concrete in the brick formwork to form a structural column, and the horse teeth of the structural column extend into the corresponding wall. The steps are:

(1) According to the requirements of the code and the layout of the structural columns, the longitudinal reinforcement of the structural column is welded or bound to the inserted reinforcement reserved in the foundation beam, and the stirrup is inserted into the longitudinal reinforcement of the structural column and fixed and bound according to the specified interval to form a structure Column steel skeleton;

(2) According to the structural characteristics of ordinary brick masonry houses at the intersection of cross-shaped, T-shaped or L-shaped corners, the method of building brick formwork first and then building brick walls, skin by skin, and two small sizes Clay bricks are used to build cross-shaped, T-shaped or L-shaped structural column formwork shells, and openings are reserved on the brick membrane shells. The openings are correspondingly arranged at the ends of the steel skeleton of the structural columns and located in the corresponding walls, and then built with clay bricks Build a brick wall, and the outside of the wall is aligned with the outside of the membrane shell;

(3) Lay the tied steel mesh on the brick wall, and align the center line of the tied steel mesh with the center line of the brick wall;

(4) Concrete is poured in the brick formwork. When pouring concrete, the material should be cut and vibrated in layers. The cast-in-place reinforced concrete columns are connected with ordinary brick walls to form a whole.

Further, the size of the small-sized clay bricks is 240mm×57mm×53mm and 120mm×57mm×53mm.

Further, the cross-shaped, T-shaped and L-shaped structural columns have a cross-section extending into the walls on both sides with a length of not less than 120mm.

Further, each time the cutting height is less than or equal to 500mm.

Further, the distance between the left and right sides of the tie-tie reinforcement mesh is 30mm from the outer wall of the brick wall, and the tie-tie reinforcement mesh is arranged every 500mm along the height of the wall.

Compared with the prior art, the present invention has the following beneficial effects:

First, according to the structural features of ordinary brick masonry houses at the intersection of cross-shaped, T-shaped, and L-shaped corners, the present invention adopts small-sized clay bricks to build the formwork, and uses the structure of the horse-toothed frame of the shell and the tie reinforcement provided The mesh, which connects the cast-in-place reinforced concrete column and the brick wall of ordinary size into a whole, can effectively improve the seismic performance of the masonry structure. Using clay bricks as the formwork for the seismic structural column scheme, it is possible to form the wall-column integration at the joints of cross-shaped, T-shaped, and L-shaped brick walls, and to pour reinforced concrete columns in the formwork.

Second, the developed brick formwork has good sealing and overall rigidity, which is beneficial to the pouring, vibration and maintenance of concrete in the shell; the brick formwork is also an effective part of the structural column, which can increase the The thickness of the protective layer of steel bars can reduce the corrosion of steel bars.

Third, compared with the structural columns in the current "Code for Seismic Design of Buildings", the cross-shaped, T-shaped, and L-shaped structural columns designed by the present invention increase the distance between the wall and the wall when the cross-sectional area is appropriately reduced. Combined with the length, the constraint effect of the structural column on the deformation of the wall is increased.

Fourth, the main construction process of the brick formwork seismic structural column includes: brick formwork and brick wall masonry, tie reinforcement mesh placement, longitudinal reinforcement skeleton placement, concrete pouring, vibration and maintenance. This process uses a new type of brick formwork to replace the conventional steel-wood formwork, which can effectively reduce the cost of the formwork and the construction period, and is conducive to the overall integration of the structural column and the brick wall and the consistency of the building appearance.

Fifth, according to the basic requirements of the "Code for Seismic Design of Buildings", aiming at the deficiencies in the design and construction of existing seismic structural columns, the present invention has developed a new type of brick formwork seismic structural column scheme, the purpose of which is to obtain materials on the spot and simplify process, reduce cost, improve seismic performance, and facilitate popularization and application in the construction and seismic reinforcement of multi-storey masonry houses in villages and towns. The scheme uses small-sized clay bricks to build the formwork of the structural columns to form an organic combination between the cast-in-place reinforced concrete columns and the brick walls to improve the seismic performance of the masonry structure. The feature of the scheme is to replace the conventional steel-wood formwork with brick formwork, which is beneficial to reduce the cost of erecting formwork and the construction period, improve the quality of concrete pouring, realize the integral combination of seismic structural columns and brick walls, and facilitate multi-layer construction in villages and towns. Promotion and application in solid house construction.

Sixth, the brick formwork anti-seismic structural column technology developed by the present invention has the advantages of low resource consumption and novel technology, and is easy to be popularized and applied in the construction and anti-seismic reinforcement of multi-storey masonry houses in villages and towns. There are a large number of masonry houses built in my country's villages and towns, if this patent is adopted, significant economic and social benefits will be obtained.

Description of drawings

Figure 1a is a geometric detail of a clay brick of small size.

Figure 1b is a geometric detail of a clay brick half-brick of a small size.

Figure 2 is a plan view of the structure column of the cross-shaped brick formwork (the shaded part indicates the horse teeth).

Figure 2.1 is a three-dimensional schematic diagram of the internal reinforced concrete column of the cross-shaped brick formwork construction column.

Figure 2.2 is a three-dimensional schematic diagram of brickwork for a cross-shaped brick wall (large column core).

Figure 2.3 is a three-dimensional schematic diagram of brickwork for a cross-shaped brick wall (small column core).

Figure 2.4 is a plan layout of the tie reinforcement mesh of the cross-shaped brick formwork column.

Figure 3 is a plan view of the construction column of the T-shaped brick formwork (the shaded part represents the horse teeth).

Figure 3.1 is a three-dimensional schematic diagram of the internal reinforced concrete column of the T-shaped brick formwork construction column.

Figure 3.2 is a three-dimensional schematic diagram of bricklaying a T-shaped brick wall (large column core).

Figure 3.3 is a three-dimensional schematic diagram of bricklaying a T-shaped brick wall (small column core).

Figure 3.4 is the plan layout of T-shaped brick formwork tie-knotted steel mesh.

Figure 4 is a plan view of the construction column of the L-shaped brick formwork (the shaded part represents the horse teeth).

Figure 4.1 is a three-dimensional schematic diagram of the internal reinforced concrete column of the L-shaped brick formwork construction column.

Figure 4.2 is a three-dimensional schematic diagram of bricklaying an L-shaped brick wall (large column core).

Figure 4.3 is a three-dimensional schematic diagram of bricklaying an L-shaped brick wall (small column core).

Figure 4.4 is the planar layout of the L-shaped brick formwork to tie the steel mesh.

In the figure: ① Brick formwork (gray filled part) ② Longitudinal bars of structural columns, ③ Stirrups of structural columns, ④ Laminated steel mesh (gray lines).

detailed description

The construction method of brick formwork anti-seismic construction column comprises the following steps:

(1) According to the requirements of the code and the layout of the structural columns, weld (or bind) the longitudinal reinforcement 2 of the structural column with the inserted reinforcement reserved in the foundation beam, and insert the stirrup 3 of the structural column into the longitudinal reinforcement of the structural column and follow the specified spacing Fixed to form the steel skeleton of the structural column;

(2) According to the structural features of ordinary brick masonry houses at the cross-shaped, T-shaped or L-shaped corner intersections, small-sized clay bricks are used to build the structural column brick formwork 1, and the brick membrane shell is reserved for openings. Correspondingly set at the end of the steel skeleton of the structural column, and then use ordinary size clay bricks to build the brick wall, adopt the method of building the brick formwork first and then build the brick wall, skin by skin; the size of the small size clay brick is 240mm Two specifications of ×57mm×53mm and 120mm×57mm×53mm;

(3) On the brick wall along the height of the wall, spread tie-tie reinforcement mesh 4 at intervals of 500mm, align the center line of the tie-tie mesh with the center line of the brick wall; The distance between the walls is 30mm;

(4) Concrete is poured in the brick membrane shell. When pouring concrete, it should be cut in layers and vibrated in layers. The height of each cut should be less than or equal to 500mm. The tie-bonded steel mesh is set to connect the cast-in-place reinforced concrete column and the ordinary brick wall into a whole.

For cross-shaped, T-shaped and L-shaped structural columns, the length of the cross-section extending into the walls on both sides is not less than 120mm.

Implementation method of brick formwork anti-seismic structural columns:

This scheme is based on a normal brick building with a wall thickness of 240mm. The specific dimensions of the small clay bricks used are shown in Figure 1. The types are shown in Figure 2, Figure 3, and Figure 4 respectively; unless otherwise specified, the strength grades of the steel bars, concrete, and brick masonry used are consistent with the current "Code for Seismic Design of Buildings". The basic principles, design methods and construction techniques of this scheme are also applicable to ordinary brick houses with a wall thickness of 370mm.

1. Structural column steel frame binding

1) According to the code requirements and the layout of the main reinforcement of the structural column, the longitudinal reinforcement of the structural column is reserved in the foundation beam.

2) Insert the stirrups into the reserved longitudinal bars, bind (or weld) the main reinforcement of the structural column, fix the stirrups of the structural column according to the specified spacing, and form the steel skeleton of the structural column.

2. Brick formwork and brick masonry

1) According to the position of the main reinforcement of the structural column, check the center line of the brick wall and the brick formwork, and carry out the construction in the order of building the brick formwork first, and then building the skin brick wall. On the day before masonry, the bricks should be watered and moistened, and the rods should be counted.

2) Build brick formwork and brick walls according to the specific requirements of various structural columns. See Figure 2.2, Figure 3.2, and Figure 4.2 for the bricklaying construction drawings of the three types of structural columns with horse-toothed parts (large column cores), respectively, and see Figure 2.3 for the brick-laying construction drawings without horse-toothed parts (small column cores) , Figure 3.3, Figure 4.3.

3) The masonry of brick formwork shall meet the following requirements:

a. Brick formwork should be built with sintered small-size bricks and ordinary-size bricks with neat edges and corners, no bending cracks, and consistent specifications, so as to ensure that the brick formwork is regular in size and tightly closed.

b. Brick formwork masonry should be laid up and down, the mortar should be dense, and the appearance should be flat, and it should be built with the surrounding brick walls to form a whole.

4) Lay a tie reinforcement mesh every 500mm (eight skin bricks) along the height of the wall, the centerline of the mesh is aligned with the centerline of the wall, and the sides are 30mm away from the outer skin of the wall. The tie reinforcement mesh should be laid flat in the brick wall, and the surrounding mortar should be dense and full to form an effective tie with the brick wall. The layout of the tie-bonded steel mesh for the three types of structural columns is shown in Figure 2.4, Figure 3.4, and Figure 4.4, respectively.

3. Concrete pouring and maintenance of structural columns

1) The pouring of structural column concrete should be carried out after the brick formwork reaches the masonry strength.

2) Concrete pouring for structural columns should be cut and vibrated in layers, and the height of each cut should not be greater than 500mm; when pouring concrete, it should be vibrated while cutting to ensure that the concrete at the horse teeth is dense.

3) During the whole process of concrete pouring, attention should be paid to ensure the position of the steel bars, so as to prevent the vibrator from damaging the stirrups and tie steel mesh.

4) During the whole process of concrete pouring, it is necessary to prevent the vibrator from damaging the brick formwork, and it is strictly forbidden to make the concrete sink and compact by beating the outside of the brick formwork.

5) After the concrete pouring is completed, appropriate amount of watering and maintenance shall be carried out. After the concrete reaches the design strength and is fully bonded with the brick formwork, the follow-up construction such as ring beams shall be carried out.

Claims (4)

1. the method for construction of brick formwork aseismatic structural column, is characterized in that, the structure according to brick masonry housing in corner intersectionFeature, selected cross, T font or L glyph construction column section shape and framework of steel reinforcement form; Adopt size to be respectively 240mmThe constructional column stock mould shell of two kinds of specification brick masonry band horse tooth troughs of × 57mm × 53mm and 120mm × 57mm × 53mm, Yi JiConstructional column framework of steel reinforcement is set in stock mould shell, between constructional column and body of wall, lays steel tie net sheet, in stock mould shell, buildConcrete forms constructional column, and the horse tooth trough of constructional column stretches in corresponding body of wall, the steps include:

(1), according to code requirement and constructional column arrangement, joint bar reserved in vertical constructional column muscle and foundation beam is welded or tied upPrick and connect, stirrup is inserted in to the vertical muscle of constructional column the fixing colligation of spacing in accordance with regulations, form consistent with constructional column cross sectional shapeFramework of steel reinforcement;

(2), according to the structural feature of cross, T font or L font corner intersection, after first building stock mould shell by laying bricks or stones, employing builds brick by laying bricks or stonesWall, the mode of building by laying bricks or stones by skin, adopt size to be respectively two kinds of 240mm × 57mm × 53mm and 120mm × 57mm × 53mmSpecification clay brick is built cross, T font or L glyph construction post formwork by laying bricks or stones, reserved Cha Kou on brick formwork, and raft mouth correspondence is arranged onConstructional column framework of steel reinforcement end is also positioned at corresponding body of wall, then uses unselected clay brick masonry brick wall, wall outer side and formwork outsideAlignment; (3) the tension rib net sheet that tiles on brick wall, tension rib net sheet center line aligns with brick wall center line;

(4) casting concrete in brick formwork, answers layering blanking, layering to vibrate when casting concrete, by brick formwork shellThe steel tie net sheet arranging on body horse tooth trough structure and brick wall, connects into cast-in-situ reinforced concrete column and common brick wall bodyEntirety.

2. the method for construction of brick formwork aseismatic structural column according to claim 1, is characterized in that, the cross section of concrete columnThe length stretching in the body of wall of both sides is all not less than 120mm.

3. the method for construction of brick formwork aseismatic structural column according to claim 1, is characterized in that, each described concreteBlanking is highly less than or equal to 500mm.

4. the method for construction of brick formwork aseismatic structural column according to claim 1, is characterized in that, described tension rib net sheetThe horizontal bar dowel that is 250mm by three longitudinal long reinforcing bars and spacing is welded, and the tension rib net sheet left and right sides is apart from brick wallThe distance of exterior wall is 30mm, and described tension rib net sheet is arranged once every 500mm along wall is high.