CN102979322B - Method for integrally reinforcing masonry structure by sectional steel combined ring beams and construction columns - Google Patents

Abstract

The invention relates to the field of construction engineering, in particular to the strengthening of building structures, and discloses a method for integrally reinforcing a masonry structure with a steel composite ring beam and a structural column. The technical scheme is to use angle steel, The steel plate and the cross-piercing screw form a combined section with the original wall; a steel ring beam is set at the junction of the wall and the floor, and the steel ring beam is welded to the steel and steel plates in the composite column, and then between the wall and the steel (steel plate) Fill with polymer mortar. The horizontal ultimate bearing capacity of the masonry structure strengthened by this method is more than 25% higher than that of the masonry structure required by the current seismic code, which greatly improves the mechanical performance and seismic performance; at the same time, compared with the external reinforced concrete ring beam and structural column It has outstanding advantages such as short construction period, simple construction process, no need to set up formwork, and no occupied space. It is suitable for improving the overall seismic performance of non-ring beams and structural column masonry structures with large quantities and wide areas in my country.

Description

The Method of Integral Reinforcement of Masonry Structure with Section Steel Combined Ring Beam and Construction Column

technical field

The invention relates to the field of construction engineering, and relates to a method for integrally reinforcing a masonry structure by utilizing section steel, steel plates, screws and polymer mortar.

Background technique

Masonry structure is a structural form widely used in my country, and there are a large number of masonry structures from cities to rural areas. Most of the masonry houses built before the implementation of the 89 edition of "Code for Seismic Design of Buildings" (GBJ11-89) (formally implemented in 1992) were unreinforced masonry structures that did not consider seismic fortification or incomplete seismic measures. Previous earthquake damages (especially the Tangshan Earthquake and Wenchuan Earthquake) have shown that this type of housing has poor earthquake resistance and is severely damaged or completely collapsed in earthquakes, which is the main cause of casualties. Moreover, there is a large stock of such houses, and all demolition and reconstruction are unreasonable in terms of economy, society, and environment. The best way is to improve its overall seismic performance through reasonable overall reinforcement methods so that it can continue to function. The existing reinforcement and transformation methods are mostly aimed at a single component, the overall effect is not good, and more wet construction is used, the construction period is long, the impact on the surrounding environment is large, and the reinforcement construction has a certain impact on the use space and facade of the masonry structure. adverse effects.

Contents of the invention

The invention aims to provide a method for integrally reinforcing a masonry structure with a steel composite ring beam and a construction column.

The method for integrally reinforcing masonry structures with section steel combined ring beams and structural columns has the following technical scheme: according to the requirements of the current building anti-seismic design codes, set section steel composite structural columns at the positions where structural columns and ring beams need to be arranged in masonry structures And shaped steel ring beams, shaped steel composite structural columns The middle shaped steel and vertical steel plate are connected to the original structure foundation through the newly added small cap, and the shaped steel, wall and steel plate are connected by cross-piercing screws, while the shaped steel, steel plate and wall Polymer mortar is used to fill the space, and steel-wall-steel plate and polymer mortar form a steel composite column; a steel ring beam is installed at the junction of the bottom of the floor and the wall, and the steel members on both sides of the wall are also passed through the screw rods. Connection; the ring beam and the steel members in the composite column are connected by welding, and the steel composite column and the steel ring beam form a new structural column-ring beam system, which improves the earthquake resistance of the masonry structure.

The method for integrally reinforcing a masonry structure with a steel composite ring beam and a construction column includes the following steps:

(1) Bind the small platform reinforcement cage and plant the small platform reinforcement cage on the original structure foundation;

The small platform reinforcement cage includes 12 vertical reinforcements and 3 stirrups. The vertical reinforcements are planted in the foundation of the original structure, and the depth is 19 to 22 times the diameter of the vertical reinforcements. The stirrups are bound through the wall to form; the vertical reinforcement diameter 12mm, stirrup diameter 8mm;

(2) Install the vertical steel components of the steel structural columns at each position where the steel structural columns are required, and keep a gap of 8-12mm between the vertical steel components and the wall surface; the vertical steel components run through the floor and are set along the entire height of the house;

The vertical steel members on both sides of the wall are anchored by cross-piercing screws, and the vertical steel members on the same side are connected by plate welding; the lower ends of the vertical steel members are anchored into the steel cage of the small cap;

Preferably, the cross-piercing screw is a 5.8-grade M12 screw with a spacing of 200mm;

Preferably, the vertical steel members include two vertical angle steels of steel structural columns and two vertical steel plates of steel structural columns, the vertical angle steels of steel structural columns are installed at the corners in the wall, and the vertical steel plates of the two steel structural columns are 6 Installed on the opposite side of the vertical angle steel of the steel structural column, and the vertical angle steel of the steel structural column is aligned with the outer side of the vertical steel plate of the steel structural column; the gap between the vertical steel member and the wall surface is 10mm;

(3) Steel ring beam horizontal steel members are installed at the junction of the bottom of the slab and the wall, and the horizontal steel members on both sides are anchored by cross-piercing screws;

Preferably, the cross-piercing screw is a 5.8-grade M12 screw with a spacing of 200 mm;

Preferably, the panel spacing is 200mm, the length is 340mm, the width is 50mm, and the thickness is 5mm.

Preferably, the steel ring beam horizontal steel member includes two steel ring beam horizontal angle steels and two steel ring beam horizontal steel plates; the steel ring beam horizontal angle steel is set at the inner corner of the floor and the wall, and the steel ring is set at the corresponding position on the outside of the outer wall The horizontal steel plate of the beam; and the horizontal angle steel of the steel ring beam is aligned with the outside of the horizontal steel plate of the steel ring beam;

(4) The horizontal steel member of the steel ring beam is welded to the vertical steel member of the steel structural column; when the steel member of the steel ring beam encounters the vertical steel member of the steel structural column, the steel ring beam member is disconnected and welded;

(5) The self-leveling grouting material is poured in the formwork of the small cap, and the gap between the vertical steel member, the panel and the wall is filled with polymer cement mortar. The strength of polymer cement mortar is not lower than C40.

The method for integrally strengthening the masonry structure with a steel composite ring beam and structural columns of the present invention has the following technical effects:

It can greatly improve the seismic bearing capacity and performance of the masonry structure, ensure that the structure meets the requirements of the current seismic code, and make the masonry structure continue to be used. At the same time, the construction process of steel structural column-steel ring beam and polymer mortar is simple and the construction period is short , The impact of construction is small, and there is no impact on the original use space and facade.

Description of drawings

Figure 1 is a cross-sectional view of a masonry structure reinforced by a steel composite ring beam and structural columns.

Fig. 2 is a cross-sectional view in the A-A direction of the overall reinforced masonry structure composed of steel ring beams and structural columns.

Fig. 3 is a cross-sectional view in the B-B direction of the overall reinforced masonry structure composed of section steel ring beams and structural columns.

Fig. 4 is a cross-sectional view in the C-C direction of the overall reinforced masonry structure with steel composite ring beams and structural columns.

Fig. 5 is a cross-sectional view in the D-D direction of the overall reinforced masonry structure with steel composite ring beams and structural columns.

In the figure 1—wall, 2—small cap, 3—reinforcement cage of cap (12□12 vertical reinforcement, 3

8 stirrups), 4 steel structural column vertical angle steel L100×5, 5M12200 piercing screw, 6—steel structural column vertical steel plate-100×5, 7—attached plate 50×340×3200mm, 8—polymer cement mortar Filler, 9—steel ring beam horizontal angle steel L100×5, 10—steel ring beam horizontal steel plate-100×5. (Where the symbol indicates the first grade steel, □ indicates the second grade steel)

Detailed ways

Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the present invention provides a method for integrally reinforcing masonry structures with steel composite ring beams and structural columns, starting from the reinforced wall structural surface, and sequentially designing from inside to outside There are: polymer mortar filling layer 8, steel structural column vertical angle steel 4 and vertical steel plate 6, steel ring beam horizontal angle steel 9 and steel ring beam horizontal steel plate 10, steel structural column decorative plate 7, steel members on both sides of the connecting wall The threaded rod 5 is opposite. The specific embodiment of the present invention is described as follows in conjunction with accompanying drawing:

(1) Carry out the steel reinforcement construction of the small cap, the plane size of the small cap 2 is 440×440mm, and the height is 300mm. Drill holes on the foundation of the original structure with an electric drill, and implant 12 vertical steel bars (secondary steel □) with a diameter of 12mm into the foundation of the original structure with a depth of 240mm (that is, 20 times the diameter of the steel bar), and three stirrups with a diameter of 8mm ( Grade-1 steel) runs through the wall and is bound in place to complete the reinforcement cage 3 for the small cap.

(2) After removing the plaster layer on the surface of the wall where steel structural columns and steel ring beams need to be installed, clean it with a wire brush. The vertical steel members of the steel structure column are two steel structure column vertical angle steel 4 (side length 100mm, thickness 5mm) and 2 steel structure column vertical steel plates 6 (thickness 5mm, width 100mm), respectively anchored into the small cap Inside the steel cage, and run through the floor along the full height of the building, a 10mm gap is reserved between the vertical member and the wall.

The vertical angle steel of the steel structural column is installed at the corner of the wall, and the two vertical steel plates 6 of the steel structural column are installed on the opposite side of the vertical angle steel of the steel structural column, and the vertical angle steel of the steel structural column is connected to the outer side of the vertical steel plate of the steel structural column Alignment; after the vertical angle steel of the steel structural column and the vertical steel plate of the steel structural column are installed in place, the vertical steel members on both sides of the wall are connected through the wall through the 5.8-grade M12 cross-thread screw 5 screw, and the two steel members on the same side of the wall Use patch 7 welding connection; patch length 340mm, width 50mm, thickness 5mm, spacing 200mm.

(3) Steel ring beams are set at the junction of the bottom of the slab and the wall. The steel members of the steel ring beams in the middle wall include two steel ring beam horizontal angle steels 9 (side length 100mm, thickness 5mm), and the side walls use 9 And 10, set the steel ring beam horizontal angle steel at the inner corner of the floor and the wall, and set the steel ring beam horizontal steel plate on the outside of the outer wall, and the steel members on both sides are connected by 5.8 grade M12 cross-penetrating screws 5 through the wall, and the distance between the cross-penetrating screws 200mm.

(4) Connect the horizontal steel member of the steel ring beam to the vertical member of the steel structural column by welding; when the steel member of the steel ring beam meets the vertical steel member of the steel structural column, the steel ring beam member is disconnected and welded.

(5) Make the small cap formwork, and then manually stir the self-leveling grouting material to complete the pouring of the small cap 2. The gap between the steel member (including angle steel, steel plate and panel) and the wall is filled with polymer cement mortar filler 8, and the compressive strength of the polymer mortar is not less than 40MPa. After filling, it is inspected by manual knocking Whether there is a gap, if there is a gap, it needs to be reworked and refilled, and then watered and maintained for three days.

According to the above specific implementation methods, the specimens of the reinforced wall were designed and the low-cycle repeated load test was carried out. The test results show that the horizontal ultimate bearing capacity of the masonry reinforced by the steel composite ring beam and the structural column is more than 25% higher than that of the masonry structure adopting the current seismic code.

Claims (7)

1. a method for shaped steel combination collar tie beam and constructional column integral reinforcing masonry structure, is characterized in that, comprise the following steps:

(1) the little cushion cap reinforcing cage of colligation, and little cushion cap reinforcing cage is planted on original structure basis;

(2) install steel construction post vertical steel component in each position arranging steel construction post that needs, vertical steel component and surface of wall retain 8 ~ 12mm gap; Vertical steel component runs through floor and arranges along house overall height;

Described vertical steel component comprises two vertical angle steel of steel construction post and two vertical steel plates of steel construction post, the vertical angle steel of steel construction post is arranged on the corner in body of wall, two blocks of vertical steel plates of steel construction post are arranged on the vertical angle steel offside of steel construction post, and the vertical angle steel of steel construction post and the vertical steel plate outboard alignment of steel construction post; Vertical steel component and surface of wall gap are 10mm;

The vertical steel component of wall both sides adopts wearing screw rod anchoring, and homonymy vertical steel component adopts batten plate to be welded to connect; Vertical steel component lower end anchors in little cushion cap reinforcing cage;

(3) at the bottom of plate with the horizontal steel beam column of the elongated installation in body of wall junction steel ring beam, the horizontal steel beam column of both sides adopts wearing screw rod anchoring;

(4) the horizontal steel beam column of steel ring beam is connected with steel construction post vertical steel Member Welding;

The horizontal steel beam column of steel ring beam comprises two steel ring beam horizontal corner steels and two steel ring beam horizontal steel plate; Arrange steel ring beam horizontal corner steel at the inner corner trim place of floor and body of wall, outside exterior wall, correspondence position arranges steel ring beam horizontal steel plate; And steel ring beam horizontal corner steel and steel ring beam horizontal steel plate outboard alignment; The horizontal steel beam column of described steel ring beam disconnects at steel construction post vertical member place, and is interconnected by welding;

(5) Self-leveling grouting material is built in little cushion cap molding, vertical steel component, batten plate and body of wall gap-fill polymer cement mortar; Polymer cement mortar intensity is not less than C40.

2. the method for shaped steel combination collar tie beam described in claim 1 and constructional column integral reinforcing masonry structure, it is characterized in that, the described little cushion cap reinforcing cage of step (1) comprises 12 vertical reinforcements and 3 stirrups, vertical reinforcement is planted in original structure basis, the degree of depth is 19 ~ 22 times of vertical reinforcement diameter, and stirrup runs through body of wall colligation and is shaped.

3. the method for shaped steel combination collar tie beam described in claim 1 and constructional column integral reinforcing masonry structure, is characterized in that, described vertical reinforcement diameter 12mm, stirrup diameter 8mm.

4. the method for shaped steel combination collar tie beam described in claim 1 and constructional column integral reinforcing masonry structure, is characterized in that, the vertical angle steel length of side 100mm of steel construction post, thickness 5mm; Steel construction post vertical steel plate thickness 5mm, width 100mm.

5. the method for shaped steel combination collar tie beam described in claim 1 and constructional column integral reinforcing masonry structure, is characterized in that, steel ring beam horizontal corner steel length of side 100mm, thickness 5mm; Steel ring beam horizontal steel plate thickness 5mm, width 100mm.

6. the method for shaped steel combination collar tie beam described in claim 1 and constructional column integral reinforcing masonry structure, is characterized in that, in step (2) and (3), is 5.8 grades of M12 screw rods to wearing screw rod, spacing 200mm.

7. the method for shaped steel combination collar tie beam described in claim 1 and constructional column integral reinforcing masonry structure, is characterized in that, step (2) infix distance between plates 200mm, long 340mm, wide 50mm, thick 5mm.