CN103510530A - Embedded foundation of composite wallboard and implementation method thereof - Google Patents

Abstract

The invention discloses a composite wall panel embedded foundation, which comprises a semi-assembled composite reinforced concrete wall panel and an embedded foundation of cast-in-place reinforced concrete with grooves, the semi-assembled composite reinforced concrete wall panel After the hoisting and positioning of the prefabricated part is completed, the composite wall panel and the embedded foundation are poured into a whole by pouring concrete in the core area of the semi-assembled composite reinforced concrete wall panel and the foundation groove, forming a well-stressed embedded node. The present invention adopts an embedded foundation form, and the groove foundation and the laminated wallboard form a whole through the post-cast concrete, and its mechanical performance is closer to that of the cast-in-place concrete structure, and can form a good embedded solid end, effectively avoiding the The deformation of the force wall under the horizontal earthquake is concentrated near the horizontal joints, resulting in poor ductility, and the composite basement exterior wall panels have low flexural bearing capacity at the top section of the foundation and are prone to water seepage.

Description

A composite wall panel embedded foundation and its implementation method

technical field

The invention belongs to the technical field of structural engineering, and in particular relates to an embedded foundation of a laminated wall panel and an implementation method thereof.

Background technique

Semi-assembled laminated wall panels are generally used as the main lateral force-resisting member of reinforced concrete structures to form laminated slab shear wall structures. The prefabricated part of the laminated wall panel consists of two layers of prefabricated panels and lattice steel bars for connection. After the prefabricated components are installed on site, the necessary stress reinforcement and structural reinforcement are set, and concrete is poured in the core parts and edge components of the prefabricated wall panels to form a composite stress structure. The common foundation connection of laminated wall panels adopts the form of horizontal patchwork, and the foundation inserts are used to extend into the cast-in-place concrete of the core part of the laminated wall panels, so as to transfer the load borne by the structure to the foundation. The elastic-plastic response of the laminated slab shear wall adopting this basic structure form is dominated by "swing" deformation under the action of horizontal earthquakes. Near the joints, the deformation capacity of concrete and steel bars is high, resulting in poorer structural ductility than cast-in-place concrete shear walls.

Laminate wall panels can also be used as exterior wall panels (retaining walls) in basements. At this time, under the lateral pressure of the soil, the wallboard mainly bears the out-of-plane bending moment. However, for the horizontal joint section of the laminated wall panels at the top of the foundation, the stressed longitudinal reinforcement is the foundation inserted in the cast-in-place concrete at the core of the wall panel, so under the action of out-of-plane bending moment, the effective height of the bottom section is greatly reduced Small, the cross-sectional bearing capacity is reduced, and it becomes a weak link under force. When the waterproof measures are not handled properly, this part is prone to quality problems such as water seepage.

In order to improve the mechanical performance of the laminated wall panel under the action of horizontal earthquake and lateral earth pressure, so that it can achieve the same force as the cast-in-place concrete shear wall, the embedded foundation can be used.

Contents of the invention

The object of the present invention is to make up for the deficiencies of the prior art, and to provide a laminated wallboard embedded foundation and its implementation method.

The present invention is achieved through the following technical solutions:

A composite wall panel embedded foundation is characterized in that it consists of a semi-assembled composite reinforced concrete wall panel and an embedded foundation with grooved cast-in-place reinforced concrete, the semi-assembled composite reinforced concrete wall panel After the hoisting and positioning of the prefabricated part in the center is completed, the composite wall panel and the embedded foundation are poured into a whole by pouring concrete in the core area of the semi-assembled composite reinforced concrete wall panel and the foundation groove, forming a well-stressed embedded node.

The embedded foundation can be used for flat raft foundations, beam raft foundations, strip foundations or pile foundation strip caps under shear walls, and can also be used for superimposed basement outdoor wall panel foundations.

When the semi-assembled composite reinforced concrete wall panel is used as a shear wall bearing a relatively large horizontal load, foundation inserts should be provided in the embedded foundation to extend into the core cast-in-place concrete of the semi-assembled composite reinforced concrete wall panel; When the above-mentioned laminated wall panels are used as basement exterior wall panels, the foundation inserts may not be provided.

The outer surface of the prefabricated wallboard embedded in the foundation and the inner surface of the side wall of the foundation groove should be roughened by measures such as scraping.

Stressed steel bars should be arranged in the side wall of the reinforced concrete embedded foundation groove.

The bottom row of horizontal steel bars of the laminated wall panels should be welded with vertical stressed steel bars.

The post-cast concrete should adopt fine stone micro-expansion concrete.

The construction method of the semi-assembled laminated wallboard embedded foundation is characterized in that it specifically includes the following steps:

(1) First, bind the foundation reinforcement and pour concrete to form a groove. The cross section of the groove is trapezoidal, the width of the bottom is (h+100) mm, the width of the top is (h+150) mm, and h is the thickness of the laminated wall panel;

(2) The inner surface of the side wall of the groove and the outer surface of the part of the prefabricated wallboard embedded in the groove are roughened by measures such as scraping;

(3) Place a square positioning block on the top of the foundation groove, insert the prefabricated wall panel into the groove, and place it on the positioning block. The purpose of placing the positioning block is to use it to level the prefabricated wall panel. A gap is reserved between the bottom of the wall panel and the top of the foundation groove, so that the core area of the prefabricated wall panel and the concrete in the groove can be connected as a whole. The height of the block is about 40mm;

(4) After correcting the verticality and position of the prefabricated wall panels, fix them with positioning supports;

(5) Bundle part of the steel bars on the site and set up the formwork;

(6) Pour fine stone micro-expansion concrete in the core area of the laminated slab and the concave foundation, vibrate and maintain, so that the laminated wall slab and the foundation form a whole.

In order to meet the embedded requirements of the shear wall, the embedded depth should not be too small. Generally, h~1.5h is desirable, where h is the thickness of the shear wall. At this time, if the anchorage length of the longitudinal stressed steel bars in the wall panel does not meet the requirements, the bottom row of horizontal steel bars and vertical stressed steel bars can be welded to improve its anchoring effect;

When the laminated wall panel is used as a shear wall bearing a large horizontal load, in order to prevent the shear wall from being pulled out and damaged along the foundation groove under the action of bending moment, the foundation inserting reinforcement should be set in the foundation, extending into the laminated wall. Composite wall panel core in cast-in-place concrete. There can be two rows of inserted bars, or only one row of larger-diameter steel bars is arranged in the middle for the convenience of construction; When the depth is sufficient, there will be no pull-out damage along the groove, so the basic ribs may not be provided.

In order to enhance the friction between the wallboard and the foundation groove, the outer surface of the prefabricated wallboard embedded in the foundation and the inner surface of the side wall of the foundation groove should be roughened by measures such as scraping.

In the side wall of the embedded foundation groove, stress reinforcement should be set according to the situation to prevent bending and shearing damage.

In order to improve the mechanical performance of joints, facilitate construction, and reduce the difficulty of vibration, the post-cast concrete should use fine stone micro-expansion concrete.

The advantages of the present invention are:

Compared with the basic connection form of horizontal joints commonly used in laminated wall panels, the present invention adopts an embedded foundation form, and the concave foundation and laminated wall panels form a whole through post-cast concrete, and its mechanical performance is closer to that of cast-in-place The concrete structure can form a good embedded end, which effectively avoids the situation that the deformation of the composite slab shear wall is concentrated near the horizontal joints under the horizontal earthquake, resulting in poor ductility. Low flexural bearing capacity, prone to water seepage.

Description of drawings

Fig. 1 is a schematic structural view of the present invention applied to a flat raft foundation under a shear wall.

Fig. 2 is a structural schematic diagram of the present invention applied to a beam-raft foundation under a shear wall.

Fig. 3 is a structural schematic diagram of the present invention applied to a strip foundation under a shear wall.

Fig. 4 is a schematic structural view of the present invention applied to strip caps of pile foundations under shear force.

Fig. 5 is a structural schematic view of the present invention applied to basement outdoor wall panels.

Detailed ways

Referring to the accompanying drawings, a composite wall panel embedded foundation includes a semi-assembled composite reinforced concrete wall panel and an embedded foundation of cast-in-place reinforced concrete with a foundation groove 4, and the semi-assembled composite reinforced concrete wall panel After the hoisting and positioning of the prefabricated part 1 is completed, the composite wall panel and the embedded foundation are poured into a whole by pouring concrete in the core area 3 of the semi-assembled composite reinforced concrete wall panel and the foundation groove 4, forming a well-stressed embedded nodes. The prefabricated part of the laminated wall panel consists of two layers of prefabricated panels and lattice steel bars 2 for connection.

If the embedded foundation is a flat raft foundation 8 , a beam raft foundation 9 , a strip foundation 11 or a pile foundation strip platform 10 , it can also be a superimposed basement outdoor wall panel foundation 12 . When the semi-assembled composite reinforced concrete wall panel is used as a shear wall bearing a relatively large horizontal load, the foundation insert 7 should be set in the embedded foundation and extend into the core cast-in-place concrete 3 of the semi-assembled composite reinforced concrete wall panel; When the wallboard is used as the outdoor wallboard of the basement, the foundation inserts may not be provided. The outer surface of the prefabricated wallboard embedded in the foundation and the inner surface of the side wall of the foundation groove 4 should be roughened by measures such as scraping. The reinforced concrete embedded foundation groove 4 side walls should be provided with stress reinforcement. A row of horizontal steel bars 6 at the bottom of the laminated wallboard should be welded with vertical stressed steel bars. Post-cast concrete shall be fine stone micro-expansion concrete.

This foundation form can be used in the four different shear wall foundations shown in Figures 1-4, and can also be used in the basement exterior wall panel foundation connected to the basement floor 12 shown in Figure 5 . The specific construction process is as follows: (1) first bind the foundation steel bars and pour concrete to form the foundation groove 4, the cross section of the foundation groove 4 is trapezoidal, the width of the bottom is (h+100) mm, and the width of the top is (h+150) mm, h is the thickness of the superimposed wallboard; (2) Insert the inner surface of the side wall of the foundation groove 4 and the prefabricated wallboard into the inner part of the foundation groove 4 to make it rough by scraping and other measures; (3) In the foundation groove 4 Place a square positioning pad 5 on the top, insert the prefabricated wallboard into the foundation groove 4, and place it on the positioning pad 5. The purpose of placing the positioning block 5 is to use it to level the prefabricated wall panel, and the second is to reserve a gap between the bottom of the wall panel and the top of the foundation groove 4, so that the concrete in the core area 3 of the prefabricated wall panel and the foundation groove 4 can be connected into a whole. The height of the block is about 40mm; (4) After correcting the verticality and position of the prefabricated wall panels, fix them with positioning supports; (5) Bind some steel bars on site and support the formwork; (6) In the core area of the laminated slab and the concave foundation Pouring fine stone micro-expansion concrete, vibrating and curing, so that the laminated wall panels and the foundation form a whole.

Claims (8)

1. A laminated wallboard embedded foundation is characterized in that: it comprises a semi-assembled laminated reinforced concrete wallboard and an embedded foundation with grooved cast-in-place reinforced concrete to form, the semi-assembled laminated reinforced concrete After the hoisting and positioning of the prefabricated part of the wall panel is completed, the composite wall panel and the embedded foundation are poured into a whole by pouring concrete in the core area of the semi-assembled composite reinforced concrete wall panel and the foundation groove, forming a well-stressed embedded nodes. 2. The embedded foundation of laminated wall panels according to claim 1, characterized in that: the embedded foundation can be used for flat raft foundations, beam raft foundations, strip foundations or pile foundation strips under reinforced concrete shear walls Caps can also be used for composite basement exterior wall panel foundations. 3. The embedded foundation of laminated wallboard according to claim 1, characterized in that: when the semi-assembled laminated reinforced concrete wallboard is used as a shear wall bearing a relatively large horizontal load, the embedded foundation should be provided with The foundation inserts extend into the core cast-in-place concrete of the semi-assembled laminated reinforced concrete wall panels; when the laminated wall panels are used as basement exterior wall panels, the foundation inserts may not be provided. 4. The semi-assembled laminated wallboard embedded foundation according to claim 1, characterized in that: the outer surface of the prefabricated wallboard embedded in the foundation and the inner surface of the side wall of the foundation groove should be shaved and other measures make it rough. 5. The semi-assembled laminated wall panel embedded foundation according to claim 1, characterized in that: the reinforced concrete embedded foundation groove side wall should be provided with stressed steel bars. 6. The semi-assembled laminated wallboard embedded foundation according to claim 1, characterized in that: the bottom row of horizontal steel bars of the laminated wallboard should be welded with vertical stressed steel bars. 7. The semi-assembled laminated wall panel embedded foundation according to claim 1, characterized in that: the post-cast concrete should be fine stone micro-expansion concrete. 8. The construction method based on the semi-assembled laminated wallboard embedded foundation described in any one of the above claims, characterized in that: it specifically includes the following steps: (1) First, bind the foundation reinforcement and pour concrete to form a groove. The cross section of the groove is trapezoidal, the width of the bottom is (h+100) mm, the width of the top is (h+150) mm, and h is the thickness of the laminated wall panel; (2) The inner surface of the side wall of the groove and the outer surface of the part of the prefabricated wallboard embedded in the groove are roughened by measures such as scraping; (3) Place a square positioning block on the top of the foundation groove, insert the prefabricated wall panel into the groove, and place it on the positioning block. The purpose of placing the positioning block is to use it to level the prefabricated wall panel. Reserve a gap between the bottom of the wall panel and the top of the foundation groove, so that the core area of the prefabricated wall panel and the concrete in the groove can be connected as a whole; the height of the pad is about 40mm; (4) After correcting the verticality and position of the prefabricated wall panels, fix them with positioning supports; (5) Bundle part of the steel bars on the site and set up the formwork; (6) Pour fine stone micro-expansion concrete in the core area of the laminated slab and the concave foundation, vibrate and maintain, so that the laminated wall slab and the foundation form a whole.

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