CN108343173A - High-strength foam concrete self-heat conserving shear wall and high-strength foam concrete self-heat conserving shear wall structure system - Google Patents

Abstract

The invention discloses a foamed concrete self-insulating shear wall, which comprises foamed concrete and distributed steel bars. The preparation method of the foamed concrete includes: 1) preparing polymer fiber, cement, water, vitrified microbeads, silica fume, water reducing agent and silane coupling agent; add foam and mix evenly, so that the density of the obtained wet foam concrete is 720-1150kg/m ³ . The invention also discloses a foam concrete self-insulation shear wall structure system including the above-mentioned foam concrete self-insulation shear wall. The prefabricated foam concrete self-insulation shear wall is used to replace the existing ordinary masonry load-bearing wall, and the post-cast The ring beam, structural column and floor cover connect all parts of this structure into a whole. The foam concrete self-insulation shear wall structure system of the present invention has the characteristics of energy saving, self-insulation, fire prevention and waterproof, good integrity, and excellent mechanical performance. Widely used in village and town building construction.

Description

High-strength foam concrete self-insulation shear wall and high-strength foam concrete self-insulation shear force Wall Structural System

technical field

The invention belongs to the field of construction, and in particular relates to a high-strength foam concrete self-insulating shear wall and a high-strength foam concrete self-insulating shear wall structure system comprising the high-strength foam concrete self-insulating shear wall.

Background technique

Building industrialization is an emerging technology. Prefabricating all or part of the building components through industrialization, and then transporting them to the site for assembly and installation can greatly reduce the amount of on-site operations, reduce various on-site pollution, speed up the construction progress, and save the construction period. It is currently being promoted. form of architectural production.

Foamed concrete has been used as thermal insulation filling materials or non-stressed thermal insulation components because of its low strength, and the smaller the thermal conductivity, the lower the strength; in recent years, with the realization of high-strength and low thermal conductivity foam concrete technology, it has been developed A new type of foamed concrete with a compressive strength of more than 3 MPa, comparable in strength to ordinary sintered brick masonry, and low thermal conductivity.

At present, most village and town buildings in our country adopt masonry structure or mixed structure. For the mixed structure, ring beams and structural columns form a weak frame, which can enhance the integrity of the building and improve the earthquake resistance; but the block masonry construction is too dependent on the level of workers, and the quality is discrete. The construction speed of masonry is slow, and the density of sintered bricks is high, resulting in excessive self-weight of the structure, which is unfavorable for earthquake resistance.

At present, building insulation mainly uses pasted insulation materials or insulation boards, which cannot achieve self-insulation of the structure, and the construction process is cumbersome, energy waste, fireproof, waterproof, and sound insulation are poor, and the life cycle of the structure cannot be the same.

Contents of the invention

The object of the present invention is to provide a foam concrete self-insulating shear wall with high strength and low thermal conductivity.

Another object of the present invention is to provide a high-strength foamed concrete self-insulating shear wall structure system that can be efficiently prepared comprising the above-mentioned foamed concrete self-insulating shear wall. It has the characteristics of waterproof, good integrity and excellent mechanical performance, and can be widely used in the construction of villages and towns.

Technical solution: The present invention provides a foam concrete self-insulating shear wall, including foam concrete and distributed steel bars. The dry density of the foam concrete is 600-1000kg/m ³ , the strength is 5-10Mpa, and the thermal conductivity is less than 0.20W/(m K); The preparation method of foam concrete comprises the following steps:

1) Prepare slurry, which includes the following components by weight: 0.5-1.5 parts of polymer fibers, 250-350 parts of cement, 80-120 parts of water, 10-20 parts of vitrified microbeads, 6-15 parts of silica fume 1.5 to 3.5 parts of water reducing agent, 1.5 to 3.0 parts of silane coupling agent; the polymer fiber is polypropylene fiber, polyacrylonitrile fiber or polyvinyl alcohol fiber;

2) Add foam to the slurry prepared in step 1) and mix evenly, so that the density of the obtained wet foam concrete is 720-1150kg/m ³ .

When preparing the slurry in the above step 1), it is only necessary to mix the components contained in the slurry evenly.

Preferably, the thermal conductivity of the foamed concrete is 0.14～0.20W/(m K); the above-mentioned foam can use any known foam, preferably, the above-mentioned foam is made of animal protein or vegetable protein foaming agent, and the density of the foam It is 70-90g/L. The double-layer configuration of the steel bars in the foam concrete self-insulating shear wall. The above foam concrete self-insulating shear wall can be prefabricated by methods known in the art for preparing shear walls. Preferably, the above-mentioned foam concrete self-insulating shear wall is formed by horizontal pouring, and its preparation steps include formwork processing, installing bottom formwork, side formwork, coating release agent, binding distributed steel bars on the wall, hoisting embedded parts, pouring foam concrete , Conservation and demoulding lifting.

Another aspect of the present invention provides a foam concrete self-insulating shear wall structure system, including the above-mentioned prefabricated foam concrete self-insulating shear wall, floor, ring beams and structural columns, and the distribution of steel bars in the foam concrete self-insulating shear wall Into the ring beam reinforcement cage and structural column reinforcement cage around the foam concrete self-insulating shear wall, the floor is a laminated reinforcement truss floor or a cast-in-place floor, and the distributed reinforcement of the floor extends into the ring beam reinforcement cage; the foam Concrete self-insulating shear walls, ring beams, structural columns and floors form a stressed whole.

Specifically, in the above-mentioned foam concrete self-insulating shear wall structure system, the longitudinally distributed steel bars in the foamed concrete self-insulating shear wall extend into the ring beam reinforcement cage, and the transversely distributed reinforcement extend into the structural column reinforcement cage; Pre-embedded steel bars can be installed in the reinforcement cage, and the spacing or size of the pre-embedded bars can meet the relevant requirements of the concrete structure design code or be designed separately; Lap the longitudinally distributed steel bars at the bottom of the shear wall at the reserved plastering groove, and seal the groove with cement mortar or foamed concrete. Ordinary concrete or high-strength foam concrete can be used for post-cast ring beam construction columns.

The size of the above-mentioned distributed steel bars extending into the structural column meets the structural requirements of the tie bars in the "Code for Design of Masonry Structures" or is designed separately; prefabricated foam concrete self-insulating shear walls reserve connection grooves or post-cast strips. The thickness of the above-mentioned foam concrete self-insulating shear wall can be determined according to the load-bearing capacity requirements of the load-bearing wall, and in consideration of "Design Standards for Energy Conservation of Civil Buildings", "Design Standards for Energy Conservation of Public Buildings", "Standards for Energy Conservation of Residential Buildings in Hot Summer and Cold Winter Areas", "Summer Relevant thermal insulation and energy-saving building codes such as the Standard for Energy Conservation of Residential Buildings in Hot Winter Areas determine the requirements for heat transfer coefficients of maintenance walls with different thicknesses; the distribution reinforcement of foam concrete self-insulation shear walls can adopt different reinforcement spacing, and the distribution reinforcement can be welded or tied. , can be single-layer or double-layer configuration; the horizontal distribution of the wall extends into the reinforcement cage of the structural column, and the size of the horizontal distribution of the reinforcement extending into the structural column reinforcement cage can refer to the design of the structural requirements of the tie bars in the "Code for Design of Masonry Structures" or another design.

When the foam concrete self-insulating shear wall is installed, the bottom of the foam concrete self-insulating shear wall is connected with the bottom ring beam by sitting grout, and the pre-embedded reinforcement and the longitudinally distributed steel bars at the bottom of the foam concrete self-insulating shear wall are overlapped at the reserved connection groove. And plaster cement mortar or foamed concrete in the reserved connection groove for lap joint connection; it is also possible to reserve a certain shape at the bottom of the wall for post-casting strips, and the distribution of steel bars at the post-casting strips overlaps with the pre-embedded steel bars of the bottom ring beam. The connection between the foam concrete self-insulating shear wall and the ring beam at the bottom is realized through the post-casting belt; the reinforcement of the ring beam and the structural column meets the structural requirements of the "Code for Design of Masonry Structures". The post-pouring ring beams and structural columns make the shear walls, ring beams, structural columns and floors a stressed whole.

The longitudinally distributed reinforcement at the top of the shear wall all extends into the ring beam reinforcement cage at the top of the wall, and all or part of the longitudinal distribution reinforcement passes through and extends out of the reinforcement cage for a certain length, and part of the longitudinal distribution reinforcement extending out of the ring beam reinforcement cage can be used as the upper wall The pre-embedded reinforcement connected between the body and the reinforcement cage.

Beneficial effects: the foam concrete self-insulating shear wall structure system of the present invention can greatly reduce the on-site workload through prefabricated wall assembly construction, reduce various on-site pollution, speed up the construction progress, and save construction period; the foam concrete self-insulating shear wall The material uses foamed concrete with high strength and low thermal conductivity, which not only meets the vertical bearing capacity and lateral resistance requirements of the village and town buildings for the load-bearing walls, but also achieves the structural self-insulation of the wall enclosure structure, avoiding the cumbersome process of making another insulation layer, And the shortcoming that the insulation material cannot have the same life cycle as the building structure, and at the same time improve the waterproof, fireproof and sound insulation performance of the building; the wall, ring beam, structural column and floor form a stressed whole through post-casting ring beams and structural columns, It has the characteristics of being superior to ordinary masonry mixed structure village and town buildings. At the same time, lightweight foam concrete can effectively reduce the weight of building structures, reduce earthquake response, improve the earthquake resistance of village and town buildings, save energy, improve construction efficiency, and strengthen the production of village and town buildings. The level of industrialization, simplifying the thermal insulation process of village and town buildings, achieving self-insulation of the load-bearing components of the enclosure structure, and at the same time improving the fire resistance and waterproof ability of the building, has a wide range of engineering application prospects.

Description of drawings

Figure 1 is a prefabricated foam concrete self-insulating shear wall (connecting grooves are reserved at the bottom of the wall);

Fig. 2 is a prefabricated foam concrete self-insulating shear wall (reserved post-pouring belt at the bottom of the wall);

Fig. 3A is a schematic diagram of binding the bottom ring beam reinforcement cage, pre-embedded reinforcement and structural column longitudinal reinforcement at the L-shaped corner, and Fig. 3B is a schematic diagram of binding the bottom ring beam reinforcement cage, pre-embedded reinforcement and structural column longitudinal reinforcement at the T-shaped corner;

Fig. 4 is a schematic diagram of smearing and connecting mortar on the bottom ring beam;

Figure 5 is a schematic diagram of installing a prefabricated foam concrete self-insulating shear wall on the bottom ring beam;

Figure 6 is a schematic diagram of the binding of structural column stirrups after the installation of high-strength foam concrete self-insulating shear walls;

Fig. 7 is a schematic diagram of pouring structural columns;

Fig. 8 is a schematic diagram of pouring foam concrete from the bottom of the thermal insulation shear wall;

Figure 9 is a schematic diagram of installing a two-story reinforced truss laminated floor and binding a second-story ring beam reinforcement cage;

Fig. 10 is a schematic diagram of pouring strips after pouring a two-story reinforced truss laminated floor;

Figure 11 is a schematic diagram of a two-story complete house.

The reference numerals in Figures 1 to 11 indicate respectively: 1 indicates foam concrete self-insulating shear wall, 2 indicates longitudinal distribution of steel bars, 3 indicates horizontal distribution of steel bars, 4 indicates hoisting embedded parts, 5 indicates ring beam reinforcement cage, and 6 indicates structure Column reinforcement cage, 7 means floor, 8 means ring beam, 9 means structural column, 10 means pre-embedded reinforcement, 11 means sitting grout, 12 means connecting groove, 13 means post-pouring belt, 14 means longitudinal reinforcement of structural column, 15 means Temporary support, 16 indicates structural column stirrups, and 17 indicates distribution reinforcement of floor slabs.

Detailed ways

The foamed concrete self-insulating shear wall structure system of the present invention is composed of a prefabricated foamed concrete self-insulating shear wall 1, a floor 7, a ring beam 8 and a structural column 9, and the prefabricated foamed concrete self-insulating shear wall 1 is internally arranged in a longitudinal direction. The distributed steel bars 2 and the horizontally distributed steel bars 3 extend into the surrounding ring beam steel cage 5 and the structural column steel cage 6 respectively. The floor 7 adopts a steel truss laminated floor or a cast-in-place floor, a steel truss slab or a cast-in-place floor The slab distribution steel bar 17 extends into the ring beam reinforcement cage 5, and through the post-casting ring beam 8 and structural column 9, the foam concrete self-insulating shear wall 1, ring beam 8, structural column 9 and floor 7 form a stressed whole.

Accompanying drawings 1 to 11 of the description show the preparation method of the high-strength foam concrete self-insulating shear wall structure system of the present invention in accordance with the serial numbers of the drawings.

As shown in Figures 1 and 2, in the high-strength foam concrete self-insulating shear wall structure system, the prefabricated foam concrete self-insulating shear wall 1 is poured with high-strength and low thermal conductivity foam concrete, and the interior of the wall is equipped with distributed steel bars and hoisting Embedded parts 4, connection grooves 12 or post-casting strips 13 are reserved at the bottom of the wall, and reserved steel bars protrude around the wall. The foam concrete self-insulating shear wall 1 distributes reinforcement double-layer or single-layer configuration. Foam concrete self-insulating shear wall 1 is formed by horizontal pouring, that is, formwork processing, installation of bottom formwork, side formwork, application of release agent, binding of distributed steel bars on the wall and hoisting of embedded parts, pouring of foam concrete, curing and demoulding. Die lifting. Among them, the strength of foam concrete is 5-10Mpa, and the thermal conductivity is less than 0.20W/(m·K).

As shown in Figure 3 and Figure 4, during the construction of the bottom ring beam, the bottom ring beam reinforcement cage 5, the pre-embedded reinforcement 10 and the structural column longitudinal reinforcement 14 are bound first according to the relevant "Code for Design of Masonry Structures", and then the bottom ring beam is poured. ring beam.

As shown in Figure 4 and Figure 5, when installing the prefabricated foam concrete self-insulating shear wall 1, first coat the cement mortar sitting grout layer 11 on the bottom ring beam 8, and make the bottom of the prefabricated wall extend into the reserved connection groove during installation In 12, the longitudinally distributed steel bars 2 and the pre-embedded bars 10 on the bottom ring beam are overlapped and connected in the reserved connection groove 12, and then the temporary lateral support 15 of the shear wall is installed, and then the reserved connection groove 12 is sealed with cement slurry.

As shown in Figures 6 and 7, after the foam concrete self-insulating shear wall 1 is installed, the structural column stirrups 16 are bound, and then the structural column 9 is poured so that the foamed concrete self-insulating shear wall 1 passes through the post-casting structural column 9 connected into a whole.

As shown in FIG. 8 , the bottom of the high-strength foam concrete self-insulating shear wall 1 is connected to the ring beam 8 at the bottom through the pouring belt 13 after pouring.

As shown in Figure 9, after the installation of the first-floor high-strength foam concrete self-insulating shear wall 1 and the pouring of the structural columns 9, the prefabricated composite floor 7 is hoisted, and the second-floor ring beam reinforcement cage 5 and the composite floor slab are bound Distribute steel bars 17 so that the distributed steel bars 17 of the superimposed floor slab extend into the ring beam reinforcement cage 5, or directly bind the cast-in-place floor reinforcement cage according to the design.

As shown in Figure 10, after the 7 steel bars of the superimposed floor are bound, or all the steel bars of the cast-in-place floor are bound, ordinary concrete is poured to form a complete floor, so that all foam concrete self-insulating shear walls 1 and ring beams on the bottom layer 8. The structural column 9 and the floor 7 are connected as a whole.

As shown in Figure 11, after the construction of the first floor is completed, the upper layer is constructed in the same way to obtain a complete foam concrete self-insulating shear wall structure system.

The construction process of the high-strength foam concrete self-insulating shear wall structure system of the present invention is: prefabrication of the foam concrete self-insulation shear wall 1-binding bottom ring beam reinforcement cage 5, pre-embedded reinforcement 10 and structural column longitudinal reinforcement 14-pouring bottom Ring beam 8-foam concrete self-insulation shear wall 1 installation-foam concrete self-insulation shear wall connection groove 12 plastering or pouring strip after pouring 13-binding structural column stirrup 16-pouring structural column 9-installation of laminated floor 7. Binding the reinforcement cage of the cast-in-place floor, and binding the reinforcement cage of the ring beam on the second floor. 5- After pouring the laminated floor, pouring the floor or integrally pouring the floor, carry out the upper layer construction in the same way.

In a word, a high-strength foam concrete self-insulation shear wall structure system of the present invention uses a high-strength self-insulation foam concrete prefabricated shear wall to replace the existing ordinary masonry load-bearing wall, and through the post-cast ring beam or The structural column connects the prefabricated shear walls into a whole. Through the construction of prefabricated assembled walls, the construction efficiency is improved. It can not only bear the upper load and provide lateral strength as a force-bearing member, but also use the thermal insulation performance of foam concrete to achieve architectural The structure is self-insulating. This kind of high-strength foam concrete self-insulating shear wall structure system can simplify construction regulations and construction procedures, has the functions of heat preservation, energy saving, sound insulation, fire prevention, and waterproof, and is suitable for building green and energy-saving village and town buildings with less than 6 floors.

Example 1

The preparation method of the foam concrete used in the shear wall comprises the following steps:

1) Mix the following components by weight evenly to form a slurry: 1 part of polyacrylonitrile fiber, 300 parts of cement, 100 parts of water, 15 parts of vitrified microbeads, 10 parts of silica fume, 2.5 parts of water reducer, silane 2 parts of coupling agent;

2) In the slurry prepared in step 1), add the foam with a density of 80g/L prepared by the animal protein foaming agent and mix evenly so that the density (wet density) of the obtained wet foam concrete is 1000kg/m3.

The dry density of the above-mentioned wet foam concrete after casting is 875kg/m3, the thermal conductivity is 0.18W, and the strength is 8Mpa.

Example 2

The preparation method of the foam concrete used in the shear wall comprises the following steps:

1) Mix the following components by weight evenly to form a slurry: 0.5 parts of polyvinyl alcohol fiber, 350 parts of cement, 120 parts of water, 20 parts of vitrified microbeads, 6 parts of silica fume, 3.5 parts of water reducer, silane 1.5 parts of coupling agent;

2) Add vegetable protein foaming agent to the slurry prepared in step 1) to prepare foam with a density of 70g/L and mix evenly, so that the density (wet density) of the obtained wet foam concrete is 720kg/m ³ .

The dry density of the above-mentioned wet foam concrete after casting is 600kg/m ³ , the thermal conductivity is 0.14W, and the strength is 5Mpa.

Example 3

The preparation method of the foam concrete used in the shear wall comprises the following steps:

1) Mix the following components by weight evenly to form a slurry: 1.5 parts of polypropylene fiber, 250 parts of cement, 80 parts of water, 10 parts of vitrified microbeads, 15 parts of silica fume, 1.5 parts of water reducer, silane coupling Joint agent 3.0 parts;

2) In the slurry prepared in step 1), add the foam with a density of 80g/L prepared by the vegetable protein foaming agent and mix evenly, so that the density (wet density) of the obtained wet foam concrete is 1150kg/m3.

The dry density of the above-mentioned wet foam concrete after casting is 1000kg/m ³ , the thermal conductivity is 0.20W, and the strength is 10Mpa.

Claims (9)

1. a kind of foam concrete self-heat conserving shear wall, including foam concrete and distribution bar, which is characterized in that the bubble The dry density of foam concrete is 600~1000kg/m³, intensity is 5~10Mpa, and thermal coefficient is less than 0.20W/ (mK)；It is described The preparation method of foam concrete includes the following steps：

1) slurry is prepared, the slurry includes the ingredient of following weight：0.5~1.5 part of polymer fiber, cement 250~350 Part, 80~120 parts of water, 10~20 parts of glass bead, 6~15 parts of silicon ash, 1.5~3.5 parts of water-reducing agent, silane coupling agent 1.5~ 3.0 part；The polymer fiber is polypropylene fibre, polyacrylonitrile fibre or vinal；

2) be added and foam and be uniformly mixed in the slurry prepared to step 1), so as to get the density of hygrometric state foam concrete be 720~1150kg/m³。

2. foam concrete self-heat conserving shear wall according to claim 1, which is characterized in that the foam concrete is led Hot 0.14~0.20W/ of coefficient (mK).

3. foam concrete self-heat conserving shear wall according to claim 2, which is characterized in that the foam is by animal protein Or vegetable protein foaming agent is made, the density of the foam is 70~90g/L.

4. foam concrete self-heat conserving shear wall according to claim 1, which is characterized in that the foam concrete self-insurance Distribution bar single layer described in warm shear wall or the double-deck configuration.

5. foam concrete self-heat conserving shear wall according to claim 1, which is characterized in that the foam concrete self-insurance Warm shear wall by level pour it is prefabricated form, prefabrication step include template processing, installation end template, installation side template, apply Releasing agent, binding wall distribution bar and lifting built-in fitting pour foam concrete, maintenance and demoulding lifting.

6. a kind of foam concrete self-heat conserving shear wall structure system, which is characterized in that the foam concrete self-heat conserving shearing Wall construction system include foam concrete self-heat conserving shear wall (1) described in any one of Claims 1 to 5, superstructure (7), Collar tie beam (8) and constructional column (9), distribution bar stretches into the circle around shear wall in the foam concrete self-heat conserving shear wall (1) In beam steel cage (5) and constructional column steel reinforcement cage (6), the superstructure (7) is steel bar girder superposed floor or cast-in-situ floor, the building The distribution bar of lid (7) stretches into ring beam reinforcing steel bar cage (5)；Collar tie beam (8), constructional column (9) and superstructure (7) are poured after so that foam Concrete self-insulating shear wall (1), collar tie beam (8), constructional column (9) and superstructure (7) form a stress entirety.

7. foam concrete self-heat conserving shear wall structure system according to claim 6, which is characterized in that the foam is mixed Genesis analysis reinforcing bar (2) stretches into ring beam reinforcing steel bar cage (5) in solidifying soil self-heat conserving shear wall (1), and transversely distributed steelbar (3) stretches into structure It makes in column steel reinforcement cage (6)；The foam concrete self-heat conserving shear wall (1) bottom is sat slurry (11) with bottom ring beam (8) and is connect；In advance Muscle (10) and foam concrete self-heat conserving shear wall (1) bottom genesis analysis reinforcing bar (2) is buried to overlap at reserved link slot (12), It is used in combination cement mortar or foamed concrete sealing groove to carry out overlap joint connection.

8. foam concrete self-heat conserving shear wall structure system according to claim 6, which is characterized in that wall is installed When, post-cast strip (13) are reserved in foam concrete self-heat conserving shear wall (1) bottom, the distribution bar of wall and bottom at post-cast strip (13) Portion's collar tie beam embedded ribs (10) overlap joint connection, and by pour post-cast strip (13) realize foam concrete self-heat conserving shear wall (1) with The connection of bottom ring beam (8)；In the high-strength foam concrete self-heat conserving shear wall structure system, after pour collar tie beam (8), constructional column (9) and superstructure (7) so that foam concrete self-heat conserving shear wall (1), collar tie beam (8), constructional column (9) and superstructure (7) become One stress entirety.

9. foam concrete self-heat conserving shear wall structure system according to claim 6, which is characterized in that foam concrete Genesis analysis reinforcing bar (2) stretches into wall top ring beam steel reinforcement cage (5) at the top of self-heat conserving shear wall (1), and all or part of longitudinal Distribution bar (2) stretches out top ring beam steel reinforcement cage (5), stretches out in genesis analysis reinforcing bar (2) conduct of top ring beam steel reinforcement cage (5) The embedded bar that layer wall is connect with the top ring beam steel reinforcement cage (5).