CN101538903B - Prefabricated heat preservation wall body - Google Patents

Abstract

The invention belongs to the technical field of civil engineering, and concretely relates to prefabricated heat preservation wall body. The prefabricated heat preservation wall body consists of a heat preservation layer, a concrete internal wall panel, a concrete external wall panel and an FRP connecting piece, the concrete internal wall panel is internally provided with longitudinally arranged steel bars and transversely arranged steel bars, the concrete external wall panel is internally provided with longitudinal arranged steel bars and transversely arranged steel bars, the FRP connecting piece is of a recumbent H structure and consists of a ventral shield and flange girths, two flange girths are provided in the invention and are respectively arranged at the two ends of the ventral shield; the heat preservation layer is arranged between the concrete internal wall panel and the concrete external wall panel and is internally provided with hole slots which are arranged in a crisscross way, and the FRP connecting piece is inserted in the hole slots; the end of the heat preservation wall body is provided with a splice bar which is of a U-shape structure, the two ends of the splice bar are respectively inserted into the concrete external wall panel and the concrete internal wall panel. The invention realizes a novel prefabricated heat preservation wall body with an integral structural function, has the advantages of low heat conductivity coefficient, good corrosive nature, simple and convenient construction and the like, and has relatively extensive application prospect in the field of constructional engineering.

Description

A prefabricated insulating wall

technical field

The invention belongs to the technical field of civil engineering, and in particular relates to a prefabricated thermal insulation wall.

Background technique

The total building area in my country is increasing at a rate of 15% to 20% per year, and the energy directly consumed by buildings in the process of construction and use accounts for more than 30% of the total energy consumption of the whole society, and continues to rise. The national and local "ten In the first five-year construction plan, building energy conservation is regarded as one of the main energy-saving construction goals. In the complex system engineering of building energy saving, maintaining structure energy saving is the most important part of the system engineering.

As the main building maintenance structure, although the existing prefabricated thermal insulation wall has better thermal performance than the traditional single material wall, it also has shortcomings. The thermal insulation wall connectors developed in China usually use metal lattice bars, which are prone to hot and cold bridges at the joints and reduce the wall insulation effect; the metal connecting bars have poor corrosion resistance and durability, causing potential damage to the wall during use. Security risks. Although there are some prefabricated thermal insulation walls developed abroad, the connectors are made of fiber-reinforced plastics instead of metal materials to reduce the thermal bridge effect and improve the corrosion resistance and durability of the connectors, but the connectors are in the same direction in the wall. Arrangement, so that the connectors cannot fully exert their mechanical performance in the two directions of the wall plane, and there are no other structural measures at the ends of the two concrete wall panels inside and outside the wall, which will easily cause the two walls to be misaligned at the ends during use. Move the gap, so that moisture can penetrate into the EPS insulation layer in the middle of the wall to reduce its insulation effect.

Contents of the invention

The purpose of the present invention is to provide a prefabricated thermal insulation wall with low heat transfer coefficient, good thermal insulation and corrosion resistance, and fast construction speed.

The prefabricated thermal insulation wall body proposed by the present invention is composed of thermal insulation layer 2, concrete inner wall panel 3, concrete outer wall panel 4 and FRP connectors. Steel bars 6 are horizontally arranged in the panel, and the concrete outer wall panel 4 is provided with longitudinally arranged steel bars 7 inside the outer wall panel and horizontally arranged steel bars 8 inside the outer wall panel. There are two flanges 10, which are respectively located at both ends of the web 9; the insulation layer 2 is located between the concrete inner wall panel 3 and the concrete outer wall panel 4, and the insulation layer 2 is provided with holes, and the holes adopt vertical and horizontal Arranged in a staggered manner, the FRP connectors are inserted into the holes; the end of the thermal insulation wall is provided with a connecting rib 12, which is in a U-shaped structure, and the two ends of the connecting rib 12 are respectively inserted into the concrete outer wall panel 4 and the concrete interior Inside the wall panel 3.

In the present invention, an XPS foam layer 11 is provided at the ends of the concrete inner wall panel 3 and the concrete outer wall panel.

In the present invention, two adjacent thermal insulation walls are correspondingly provided with semicircular grooves, and rods 14 are arranged in the semicircular grooves, and the rest of the ends of the thermal insulation walls are connected by a waterproof sealing material layer 13 .

In the present invention, the two flanges 10 are respectively anchored in the concrete inner wall panel 3 and the concrete outer wall panel 4 .

In the present invention, the insulation layer 2 adopts EPS insulation layer.

In the present invention, the rod 14 is made of polystyrene material.

During the construction of the present invention, the inner concrete wall template is first laid, and the longitudinal and transverse reinforcement bars of the outer wall are laid, and the outer concrete outer wall board is poured to the thickness of the outer wall; Layer 2 should be provided with pre-positioned staggered slots for the connectors, and the area of the slots should be slightly larger than the flange area of the "I"-shaped connectors; fill the gaps between the webs and flanges on both sides of the connectors with insulation Block, insert the FRP connector into the preset hole slot of the insulation layer; lay the inner concrete wall reinforcement on the insulation layer 2 and pour concrete to the position.

In order to enable the wall connectors to fully exert their mechanical performance in both directions, the connectors are arranged in a criss-cross pattern in the wall insulation layer, and the insulation layer reserves pre-positioned criss-cross connector hole slots. The opening should be slightly larger than the outer dimension of the connecting piece, so as to arrange the "I" shaped connecting piece. The criss-cross spacing is determined by the anchor strength of the connectors and the concrete wall panels on both sides and the stress of the prefabricated thermal insulation wall.

In order to avoid the relative displacement caused by the out-of-plane load of the inner and outer walls and the "thermal bending" effect at the end of the wall due to the temperature difference between indoor and outdoor, and strengthen the overall effect of the inner and outer concrete wall panels on the edge of the wall, U-shaped fiber reinforced plastic connecting bars are connected between the inner and outer concrete slabs at the edge of the wall.

When the two walls are connected, a semicircular groove is reserved at the end of the external concrete wall panel of each wall, and a waterproof rod is placed in it, and the gap between the two walls is sealed with a waterproof sealing material on the outside of the rod. blocked. Prevent external rainwater from seeping into the interior of the wall.

The beneficial effects of the present invention are:

(1) The present invention uses "I"-shaped FRP connectors to connect, the web bears the horizontal shear force in the plane of the wall and the bending moment outside the plane, and the flange is anchored in the concrete slab to prevent the two walls from peeling off. Improve the integrity of the wall. In order to prevent the flange from breaking at the root of the web connection, the flange adopts a variable cross-section to increase the area of the flange root.

(2) The FRP connectors of the present invention are arranged in a criss-cross arrangement in the wall. When the wall is subjected to out-of-plane loads (wind loads and earthquake loads), the connectors are subject to combined bending and shearing. Since the moments of inertia of the connectors are different in the direction of the two axes of the centroid, the force on the connectors in the plane setting direction of the connectors is There is a big impact on performance. The test shows that the criss-cross arrangement of connectors can give full play to its mechanical performance, and the upper and lower concrete wall panels have little slippage with the connectors in two directions. This arrangement can improve the overall mechanical performance of the wall.

(3) U-shaped fiber-reinforced plastic connecting ribs are used at the end of the wall to strengthen the overall effect of the inner and outer concrete wall panels on the edge of the wall, and to avoid the "out-of-plane load" at the end of the wall and the "indoor and outdoor temperature difference" The "hot bow" effect produces misalignment.

(4) The "I"-shaped FRP connector and the U-shaped fiber reinforced plastic connecting bar of the present invention reduce the heat transfer coefficient of the wall, and realize a new type of prefabricated maintenance structure integrating the wall bearing and heat preservation functions. The wall has the characteristics of good overall thermal insulation effect, good durability and fast construction speed. At the same time, due to the use of fiber-reinforced plastics instead of traditional metal connection materials, its own weight is reduced and the basic construction cost of the building is reduced.

Description of drawings

Fig. 1 is a schematic diagram of the prefabricated thermal insulation wall structure of the present invention ((a) is a wall elevation, (b) is an A-A sectional view, and (c) is a B-B sectional view).

Figure 2 is a structural diagram of the "I"-shaped FRP connector.

Fig. 3 is a structural diagram of the arrangement of FRP connectors in the prefabricated thermal insulation wall.

Figure 4 is a structural diagram of the end of the wall and the connection of the wall.

Numbers in the figure: 1 is the FRP connector, 2 is the insulation layer, 3 is the concrete inner wall panel, 4 is the concrete outer wall panel, 5 is the longitudinal arrangement of steel bars in the inner wall panel, 6 is the horizontal arrangement of steel bars in the inner wall panel, 7 8 is the horizontal arrangement of steel bars in the exterior wall panel, 9 is the web, 10 is the flange, 11 is the XPS foam layer, 12 is the connecting bar, 13 is the waterproof sealing material layer, and 14 is the rod strip.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1: The prefabricated thermal insulation wall is mainly composed of thermal insulation layer 2, concrete inner wall panels 3, concrete outer wall panels 4, longitudinally arranged steel bars 5 in inner wall panels, horizontally arranged steel bars 6 in inner wall panels, and longitudinally arranged inner wall panels. Reinforcing bar 7, horizontally arranged reinforcing bar 8 is formed in the exterior wall panel. The longitudinally arranged steel bars 5 in the inner wall panels and the horizontally arranged steel bars 6 in the inner wall panels are distributed in the concrete inner wall panels 3, and the longitudinally arranged steel bars 7 in the outer wall panels and the horizontally arranged steel bars 8 in the outer wall panels are distributed in the concrete outer wall panels 4 Inside. The FRP connector has an "I"-shaped structure, consisting of a web 9 and a flange 10. There are two flanges 10, located at both ends of the web 9, and the two flanges 10 are respectively anchored to the concrete inner wall 3 and Concrete exterior siding 4 inside. The insulation layer 2 adopts EPS insulation board, which is located between the concrete inner wall panel 3 and the concrete outer wall panel 4. There are holes in the insulation layer 2. The holes are arranged in a criss-cross pattern, and the FRP connectors are inserted into the holes; the insulation wall The end of the body is provided with a connecting rib 12, the connecting rib 12 is a U-shaped structure, and the two ends of the connecting rib 12 are inserted into the concrete outer wall panel 4 and the concrete inner wall panel 3 respectively. An XPS foam layer 11 is provided at the ends of the concrete inner wall panel 3 and the concrete outer wall panel 4 . Two adjacent thermal insulation walls are correspondingly provided with semicircular grooves, and rods 14 are arranged in the semicircular grooves. The rods 14 are made of polystyrene material, and the rest of the thermal insulation walls are connected by a waterproof sealing material layer seal.

When the wall is made, the concrete outer wall panel formwork is laid first, the longitudinally arranged steel bars 7 in the outer wall panel and the horizontally arranged steel bars 8 in the outer wall panel are installed, the connecting bars 12 made of U-shaped fiber reinforced plastic are installed, and the outer layer of concrete wall is poured to The thickness of the outer wall; then lay the EPS insulation layer 2 on top of it. The insulation layer 2 should reserve the pre-positioned staggered FRP connectors 1 slots. The slot spacing is generally 400-600cm, and the slot area is slightly smaller than that of FRP. The cross-sectional area of the connector 1; insert the FRP connector 1 into the holes arranged vertically and horizontally in the insulation layer 2; lay the longitudinal reinforcement 5 in the concrete and the horizontal reinforcement 6 in the concrete on the insulation layer 2, and pour concrete to the position. Connect the U-shaped fiber-reinforced plastic connecting bars 12 between the inner and outer concrete slabs at the edge of the wall. The length of the connecting bars 12 deep into the concrete layer may be 300mm, and the spacing may be 500mm. An XPS foam layer 11 is provided at the ends of the concrete inner wall panel 3 and the concrete outer wall panel 4 . When the two walls are connected, a semicircular groove is reserved at the end of the external concrete wall panel of each wall, and a waterproof rod 14 is placed in it, and a waterproof sealing material layer 13 is used to seal the rod 14 outside. The gap between the two walls was blocked. Prevent external rainwater from seeping into the interior of the wall.

Claims (6)

1. A prefabricated thermal insulation wall, composed of thermal insulation layer (2), concrete inner wall panel (3), concrete outer wall panel (4) and FRP connector, is characterized in that the concrete inner wall panel (3) is provided with Longitudinal steel bars (5) and horizontal steel bars (6) are arranged in the inner wall panels, and longitudinal steel bars (7) in the outer wall panels and horizontal steel bars in the outer wall panels are arranged in the concrete outer wall panels (4). (8), the FRP connector has an "I"-shaped structure, consisting of a web (9) and a flange (10), and there are two flanges (10), which are located at both ends of the web (9); the insulation layer (2) Located between the concrete inner wall panel (3) and the concrete outer wall panel (4), the insulation layer (2) is provided with hole slots, the hole slots are arranged in a criss-cross pattern, and the FRP connectors are inserted into the hole slots; The end of the wall is provided with a connecting bar (12), the connecting bar (12) has a U-shaped structure, and the two ends of the connecting bar (12) are respectively inserted into the concrete outer wall panel (4) and the concrete inner wall panel (3) Inside. 2. The prefabricated thermal insulation wall according to claim 1, characterized in that the ends of the concrete inner wall panels (3) and the concrete outer wall panels are provided with XPS foam layers (11). 3. The prefabricated thermal insulation wall according to claim 1, wherein two adjacent thermal insulation walls are correspondingly provided with semicircular grooves, rods (14) are arranged in the semicircular grooves, and the thermal insulation walls The rest of the ends are connected by a layer of waterproof sealing material (13). 4. The prefabricated thermal insulation wall according to claim 1, characterized in that the two flanges (10) are respectively anchored in the concrete inner wall panel (3) and the concrete outer wall panel (4). 5. The prefabricated thermal insulation wall according to claim 1, characterized in that the thermal insulation layer (2) adopts EPS thermal insulation layer. 6. The prefabricated thermal insulation wall according to claim 3, characterized in that the rod (14) is made of polystyrene material.

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