CN105064529A - Prefabricated and assembled large-board shear wall structure with concealed bracings - Google Patents

Abstract

A prefabricated large slab shear wall structure with concealed supports, comprising upper and lower prefabricated reinforced concrete slabs with concealed supports and cast-in-place concrete; Notches, distributed steel bars, lattice steel bars, hidden column longitudinal bars and stirrups, square steel pipes, X-shaped steel diagonal braces, and ring-shaped reinforcement bars; The diagonal bracing is welded into a steel skeleton through L angle steel, which is jointly stressed with the steel mesh and concrete; the top of the square steel pipe has a stiffener and extends into the upper square steel pipe for a certain distance; Ring-shaped reinforcing ribs; the four-corner notches are indirectly overlapped by connecting steel bars and notched steel bars, and the central groove-shaped notch area is indirectly overlapped by inserting connecting steel bars into ring-shaped reinforcing bars; the vertical connection of the structure is more reliable, and the integrity is better. The bearing capacity is greatly improved and there are obvious multiple anti-seismic defense lines.

Description

A prefabricated large-slab shear wall structure with concealed support

technical field

The invention belongs to the field of prefabricated building structures, and relates to prefabricated building structures, mainly to a prefabricated large-slab shear wall structure system, and in particular to a prefabricated assembly type large-slab shear wall structure with hidden support and a method for constructing upper and lower connection nodes.

Background technique

The prefabricated structure is assembled and connected by prefabricated concrete components or parts, which meets the needs of the development of construction industrialization and housing industrialization. It has many advantages such as fast construction speed, high manufacturing precision, environmental protection and sustainability. The application is very extensive; domestic research is currently mainly concentrated in the field of prefabricated frame structures, and research on the seismic performance of prefabricated assembly shear wall structures is rare; the key to ensuring the seismic performance of prefabricated assembly structures is mainly reflected in structural measures such as node connections The design and other aspects of the traditional prefabricated shear wall structure mainly include: steel sleeve connection (including shear key), local unbonded steel sleeve connection, angle steel weld connection, steel bar and steel pipe bolt connection and Prestressed connection, etc.; existing experimental studies have shown that the seismic performance of prefabricated walls under these connection methods is relatively good, but they are still indirect connections after all. Compared with the overall cast-in-place shear wall structure, the joint connection is still weak and other shortcomings.

As the height of the traditional prefabricated shear wall increases, its thickness will also increase, resulting in an increase in the self-weight of the prefabricated shear wall, which is not conducive to transportation and hoisting, and has a negative effect on improving the bearing capacity of the structure and earthquake The ductility under the action is also relatively unfavorable; moreover, the traditional prefabricated shear wall structure does not have hidden columns and side columns, and the anti-seismic defense line is single.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention proposes a prefabricated assembly type large-slab shear wall structure with concealed support; It is made of cast-in-place concrete; this kind of prefabricated reinforced concrete slab with concealed support is composed of prefabricated reinforced concrete wall panels, four-corner notches, reserved notches, horizontally distributed steel bars, vertically distributed steel bars, lattice steel bars, and hidden columns in the wall panels. Longitudinal bars, hidden column stirrups, hidden column square steel pipes, X-shaped steel diagonal braces, and ring-shaped reinforcing bars; this kind of prefabricated reinforced concrete slab with hidden supports contains hidden columns, and the core of the hidden columns contains square steel pipes, square steel pipes and The X-shaped steel diagonal bracing in the wall panel is welded and connected, and the square steel pipe and the X-shaped steel diagonal brace form a steel skeleton, which is jointly stressed with the steel mesh and concrete; obviously, this kind of steel skeleton can not only improve the strength of the prefabricated large-slab shear wall. reduce the thickness of this prefabricated component, so that it can be used in high-rise structures to effectively reduce the structure's own weight. In addition, the setting of four-corner notches and reserved notches and the setting of annular reinforcing ribs can effectively ensure the integrity of the connection nodes of the upper and lower prefabricated large-slab shear walls and ensure reliable connection; it can be seen that this prefabricated The large-slab shear wall with hidden support has a large bearing capacity and reliable joint connection, and can achieve ideal ductile failure under earthquake action.

The present invention is realized through the following technical solutions:

A prefabricated large slab shear wall with concealed support, including a large reinforced concrete slab with concealed support and cast-in-place concrete;

The reinforced concrete slab with concealed support has built-in X-shaped steel plate diagonal braces with shear nails;

For the reinforced concrete slab with concealed support, concealed columns are arranged on both sides of the slab, and square steel pipes are arranged at the core of the concealed pillar;

For the reinforced concrete slab with concealed support, the slab is provided with notches at four corners, and horizontally distributed steel bars and vertically distributed steel bars are reserved;

The top of the square steel pipe is internally welded with a stiffener, and the stiffener protrudes from the lower prefabricated slab wall and extends into the upper prefabricated slab wall for a certain distance;

For the reinforced concrete slab with concealed support, groove-shaped gaps are reserved in the middle regions of the upper and lower ends, and lattice steel bars are arranged in the groove-shaped gaps;

The lattice steel bars play the role of tie prefabricated wall pieces on both sides of the groove-shaped notch;

The prefabricated large slab wall body with hidden support is indirectly overlapped at the gap through the gap steel bar and the connecting steel bar, and the middle groove-shaped gap area is indirectly lapped through the connecting steel bar and the pre-embedded annular reinforcing bar;

For the reinforced concrete slab with concealed support, the X-shaped steel diagonal brace and the central steel pipe of the concealed column are welded with L angle steel;

Compared with the cast-in-place reinforced concrete shear wall structure, most of the components of the present invention are prefabricated in the factory, and then a small amount of necessary concrete is poured after assembly on site. The factory has high production efficiency, can ensure the manufacturing accuracy and quality, and is environmentally friendly; and Compared with the existing prefabricated assembled structure, especially compared with the existing prefabricated assembled large slab shear wall structure, the prefabricated assembled large slab shear wall structure with hidden support of the present invention has more reliable connection of upper and lower vertical nodes , the integrity is better, and the formation of the steel skeleton greatly improves the bearing capacity, effectively thins the thickness of the shear wall, and at the same time has obvious multiple anti-seismic defense lines, and can perform well under the action of earthquakes.

Description of drawings

Fig. 1 is a schematic diagram of the axial side of the upper prefabricated wall panel of the present invention after positioning and binding the necessary steel bars and welding the upper and lower steel pipes.

Fig. 2 is a schematic diagram of the front elevation of a prefabricated assembly type large slab shear wall with hidden support according to the present invention.

Fig. 3 is a schematic cross-sectional view of 1-1 and 2-2 in Fig. 2 .

Fig. 4 is a schematic diagram of connection of the upper and lower nodes of the prefabricated large-slab shear wall with concealed support in the middle groove area of the present invention.

Fig. 5 is a schematic axial view of a piece of prefabricated assembled reinforced concrete wall panel with concealed support in the present invention.

Fig. 6 is a schematic diagram of the welding connection between the steel pipe of the present invention and the X-shaped steel diagonal bracing node.

Fig. 7 is a schematic diagram of the axial side of a prefabricated large-slab shear wall with poured connection nodes according to the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

A prefabricated large slab shear wall with concealed support, including setting a reinforced concrete slab with concealed support, and cast-in-place concrete 17;

The reinforced concrete slab with concealed support has built-in X-shaped steel diagonal braces 9 with shear nails 10 steel plates;

For the reinforced concrete slab with hidden support, concealed columns are arranged on both sides of the slab, and square steel pipes 13 are arranged at the core of the concealed column;

For the reinforced concrete slab with hidden support, the slab is provided with four-corner gaps 16, reserving horizontally distributed reinforcing bars 2 and vertically distributed reinforcing bars 1;

The top of the square steel pipe 13 is internally welded with a stiffener 14, and the stiffener 14 protrudes from the lower prefabricated slab wall and extends into the upper prefabricated slab wall for a certain distance;

For the reinforced concrete slab with concealed support, groove-shaped notches 5 are reserved in the middle regions of the upper and lower ends, and lattice steel bars 6 and 7 are arranged in the groove-shaped notches 5;

The lattice steel bars 6, 7 play the role of tie-in prefabricated wall pieces 4 on both sides of the notch 5;

The prefabricated large slab wall with hidden support is indirectly overlapped at the gap 16 through the gap steel bar 1 and the connecting steel bar 3, and the middle groove-shaped gap 5 area is indirectly overlapped through the connecting steel bar 3 and the pre-embedded annular reinforcing bar 8 ;

For the reinforced concrete slab with hidden support, its X-shaped steel diagonal brace 9 and the hidden column middle steel pipe 13 are welded with L angle steel 15;

Step 1: Prefabricate a prefabricated large slab with concealed support in the factory, with gaps 16 at the four corners of the large slab, and reserve groove-shaped gaps 5 in the middle of the upper and lower ends, and set lattice steel bars 6 and 7 in the groove-shaped gaps 5, First, prefabricate X-shaped steel diagonal braces 9 with shear nails 10 steel plates and square steel pipes 13 welded with stiffeners 14, then bind horizontal steel bars 2 and vertical steel bars 1, lattice steel bars 6, 7 and hidden column longitudinal bars 11 Make reinforcement cage with concealed column stirrup 12, then insert X-shaped steel diagonal brace 9 and square steel pipe 13 and weld the nodes of X-shaped steel diagonal brace 9 and square steel pipe 13 with L angle steel, square steel pipe 13 does not pour concrete during prefabrication, After the steel bars and steel skeleton are manufactured, the formwork is set up, the necessary gaps are reserved, and the concrete is poured to form a prefabricated assembled reinforced concrete wall panel with hidden support.

Step 2: After the prefabricated prefabricated slab with hidden support that has been prefabricated in the factory and reached the design strength is transported to the site for installation, positioning and temporary fixation, insert the lower stiffener 14 into the square steel pipe 13 at the gap 16 at the left and right corners , and welded up and down, the connecting steel bars 3 at the left and right corner notches 16 and the notched steel bars 1 at the left and right corner notches 16 are indirectly overlapped, and the connecting steel bars 3 in the middle groove-shaped notch 5 area are inserted into the pre-embedded annular reinforcing bars 8 Inside.

Step 3: Set up the formwork at the left and right corner gaps 16, and then pour micro-expansion type self-flowing compact concrete 17 into the left and right corner gaps 16 and square steel pipes 13. This kind of concrete can improve the connection performance of the old and new concrete interfaces. 17 After the maintenance is completed, the fabrication of the prefabricated large-slab shear wall unit with hidden support is completed on the lower floor.

Step 4: Hoist the upper prefabricated large-slab shear wall with hidden support into place, and connect the left and right corners of the prefabricated large-slab shear wall with hidden support with 16 notched steel bars 1 and connecting steel bars 3 indirectly , the connecting steel bar 3 in the middle groove notch 5 area passes through the pre-embedded annular reinforcing rib 8 and indirectly overlaps.

Step 5: Insert the lower stiffeners 14 at the notches 16 of the left and right corners into the square steel pipes 13 at the notches 16 of the left and right corners, and weld the joints of the upper and lower steel pipes 13.

Step 6: Set up the formwork at the left and right corner gaps 16, and then pour micro-expansion self-flowing compact concrete into the left and right corner gaps 16 and the square steel pipe 13. After the cast-in-place concrete 17 is cured, a typical prefabricated assembly with darkened concrete is completed. Fabrication of braced slab shear wall units.

Claims (9)

1. the large plate shear wall structure of prefabricated assembled band concealed bracings, comprises the large plate of upper and lower prefabricated band concealed bracings steel concrete and cast-in-situ concrete; The large plate of described band concealed bracings steel concrete comprises prefabricated panel, corner breach, reserved notch, distribution reinforcement, lattice reinforcing bar, sleeper indulge muscle and stirrup, square steel pipe, X-shaped steel diagonal brace, cyclic reinforcing rib; Described band concealed bracings steel concrete large plate sleeper square steel pipe and X-shaped steel diagonal brace are welded into steel frame by L angle steel, and steel mesh reinforcement and concrete jointly stressed; Described square steel pipe top tape stiffening rib and stretch into upper strata square steel pipe certain distance; The jagged reinforcing bar of described corner breach, middle part grooved gap regions has cyclic reinforcing rib; Described corner breach is overlapped indirectly by connecting reinforcement and breach reinforcing bar, and middle part grooved gap regions is then inserted cyclic reinforcing rib by connecting reinforcement and indirectly overlapped.

2. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, is characterized in that prefabricated assembled band concealed bracings steel concrete is prefabricated in the factory production, and band corner breach, breach is reserved with breach reinforcing bar.

3. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, is just arranged on the X-shaped steel plate diagonal brace of band shearing resistance nail in wallboard when it is characterized in that the large plate of prefabricated reinforced concrete.

4. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, it is characterized in that the large strip of prefabricated reinforced concrete has sleeper, and sleeper core is square steel pipe, square steel pipe inserts when prefabricated large plate, and not concreting in square steel pipe time prefabricated.

5. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, is characterized in that the X-shaped steel diagonal brace in the large plate of prefabricated reinforced concrete and the square steel pipe in sleeper form steel frame by the welding of L angle steel.

6. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, it is characterized in that the square steel pipe inside top in the large plate of prefabricated reinforced concrete is welded with stiffening rib, and stiffening rib inserts bottom the square steel pipe of upper strata after stretching out square steel pipe top certain distance.

7. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, it is characterized in that, upper and lower side central region is reserved with grooved breach, and breach both sides prefabricated panel is by lattice reinforcing bar drawknot, and prefabricated panel is embedded with the cyclic reinforcing rib that part leaks outside in grooved breach.

8. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, it is characterized in that, corner gap regions is overlapped indirectly by connecting reinforcement and breach reinforcing bar, and middle part grooved gap regions is then inserted in cyclic reinforcing rib by connecting reinforcement and indirectly overlapped.

9. the large plate shear wall structure of prefabricated assembled band concealed bracings according to claim 1, it is characterized in that, the steel concrete large board wall body of corner breach is prefabricated, corner gap regions and middle part grooved gap regions cast-in-place, X-shaped steel diagonal brace and square steel pipe are all interior when prefabricated to be buried, and forms the large plate shear wall of prefabricated assembled band concealed bracings overall after each parts joint connection in site after support mold pouring necessary microdilatancy type self-flowing dense concrete.