Building thermal insulation layer anchoring structure adopting composite material

Abstract

The utility model belongs to the technical field of building thermal insulation layers, and discloses a building thermal insulation layer anchoring structure adopting composite materials, which is characterized in that a fiber reinforced resin composite (FRP) rib anchor bolt is manufactured by taking thermosetting resin as a base body and low-heat-conductivity-coefficient reinforced fibers as a reinforced phase, and is used as an anchor bolt main body structure penetrating through a thermal insulation layer and penetrating into a foundation wall; the FRP rib anchor bolts and the tray body are connected to form an anchor bolt assembly, the anchor bolt assembly with the total length being L penetrates through the heat preservation layer with the thickness being A in the direction with the perpendicularity error ranging from 90 degrees + / -15 degrees, and anchoring is achieved; on the basis of ensuring firm and durable combination with a wall body, metal materials with high heat conduction coefficients are not adopted in the anchor bolt, and the heat conduction sectional area of the anchor bolt is reduced as far as possible, so that the heat dissipation loss caused by the anchor bolt is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of building thermal insulation layers, in particular to a building thermal insulation layer anchoring structure using composite materials. Background Art

[0002] In 1986, my country promulgated and began to implement the first industry standard aimed at promoting building energy conservation, "Civil Building Energy Conservation Design Standard (Heating Residential Building Part)" (JGJ26-86), marking the official launch of my country's building energy conservation work. At present, the country builds nearly 1 to 2 billion square meters of new urban and rural buildings each year, of which public buildings are about 300 to 400 million square meters. Existing buildings exceed 60 billion square meters, and more than 50% are high-energy-consuming buildings.

[0003] The insulation layer installation technology used in the past is: drill a hole in the wall, insert a plastic expansion tube with a tray into the hole, and then drive a steel nail into the reserved hole in the center of the plastic expansion tube to expand the plastic expansion tube and squeeze the hole wall on the wall to achieve anchoring by friction, mainly relying on the steel nail to bear the tensile and shear loads.

[0004] As the weight of the composite functional layer increases significantly, the structure of plastic expansion tube + steel nails has several problems:

[0005] First, the steel nails must extend from the outermost layer close to the composite insulation layer to the inside of the wall, otherwise they cannot effectively bear the tensile and shear loads. However, the thermal conductivity of the steel nails is ksteel = 40-50W / (m·K), with a diameter of 6mm. Ten steel nails are required for every square meter of composite insulation layer, and the cross-sectional area of ​​the steel nails on the outer wall per square meter reaches Ssteel = 0.0002826m2. The heat transfer of the steel nails per square meter of composite insulation layer is: Qsteel = ksteel × Ssteel = 0.0113-0.01413 (W·m) / K; the thermal conductivity of the thermal insulation polystyrene board is kbenzene = 0.03W / (m·K), heat transfer rate of composite insulation layer benzene board per square meter: Qbenzene = kbenzene × 1 = 0.03(W·m) / K, additional heat loss caused by steel nails Qsteel / Qbenzene = 37.67~47.1%, that is: the existence of steel nails increases the energy loss of modern building exterior wall insulation layer by 37.67~47.1%. One of my country's dual carbon goals is to achieve 75%~95% energy saving in new and existing buildings. The insulation layer installation technology of plastic expansion tube + steel nails seriously hinders the achievement of this goal.

[0006] Secondly, the anchoring force of the plastic expansion tube + steel nail structure is difficult to meet the requirements, and the tensile pull-out force is small. The current standard in my country stipulates that the tensile pull-out force of a single anchor bolt F ≥ 0.6KN. According to the existing technology, to achieve 75% to 95% energy saving in buildings, the total thickness of the composite insulation layer must reach about 250mm, and the total anchoring force of 10 anchor bolts per square meter is 6KN, which is difficult to maintain long-term stability. The weak point is that the full plastic pallet integrally molded with the plastic expansion tube is not strong enough.

[0007] Thirdly, the plastic expansion tube and the plastic pallet integrally formed with it are both made of thermoplastic polymer materials. They will creep (a phenomenon in which strain continues to increase with time) when subjected to force. Creep causes the plastic structure to deform continuously and its bearing capacity decreases. Aging will occur after long-term service. Aging causes its strength to decrease. After a certain number of years, the strength declines severely, the anchoring will fail, and the composite functional layer will easily fall off, causing economic losses and endangering environmental safety, making the composite functional layer unable to have the same lifespan as the building.

[0008] Modern energy-saving requirements in northern my country are getting higher and higher. The indicators are generally based on 490mm thick brick-concrete solid walls. If the heat loss of energy-saving building walls is reduced by 75%, it is called 75 energy saving, and so on.

[0009] FRP reinforcement is a composite material with thermosetting resin as the matrix and fiber as the reinforcement phase, including: GFRP reinforcement is a composite material with thermosetting resin as the matrix and glass fiber as the reinforcement phase; AFRP reinforcement is a composite material with thermosetting resin as the matrix and aramid fiber as the reinforcement phase; BFRP reinforcement is a composite material with thermosetting resin as the matrix and basalt fiber as the reinforcement phase.

[0010] GFRP reinforcement is the most commonly used and has the highest cost-effectiveness. Its thermal conductivity is kG = 0.712 ~ 1.34W / (m·K). If the diameter of the reinforcement anchor is 10mm, 10 FRP reinforcement anchors are required for each square meter of insulation layer. The cross-sectional area of ​​GFRP reinforcement per square meter of the exterior wall is SG = 0.000785m2. The heat transfer caused by GFRP reinforcement anchors for 1m2 of wall is: QG = kG × SG = 0.0006 ~ 0.001 1(W·m) / K; the thermal conductivity of the insulation polystyrene board is kbenzene = 0.03W / (m·K), the heat transfer of 1m2 wall insulation polystyrene board is: Qbenzene = kbenzene × Sbenzene = 0.03(W·m) / K, the additional heat loss caused by GFRP reinforcement is QG / Qbenzene = 2~3.7%. Obviously, the use of GFRP reinforcement anchor bolts to replace the insulation layer anchoring method of plastic expansion tube + steel nails is of decisive significance to whether 75%~95% energy saving can be achieved in modern buildings.

[0011] Chinese patent CN201921912117.1 discloses "External insulation device for exterior wall of building energy-saving renovation". The diameters of the mounting hole 11 and the through hole 15 are both ten millimeters, and the fixing bolt 8 is threadedly connected to the insulation board 2, the mesh cloth board 3 and the moisture-absorbing sound insulation board 4. The fixing bolt 8 is inserted from the mounting hole 11 toward the inside, and passes through the moisture-absorbing sound insulation board 4, the polystyrene board 12, the polyurethane board 13, the mesh cloth board 3 and the extruded board 14 in a spiral manner in turn and extends to the inside of the wall 1, and then fixes it with a thread.

[0012] Chinese patent CN01103568.4 discloses "External insulation and energy-saving technology for building exterior wall panels". One of the technical features is the use of non-metallic expansion bolts (FP bolts for short), SBS (engineering plastics) for bolt rods, caps, and pads, and another polyethylene material for expansion tubes.

[0013] This design uses SBS (engineering plastic) as the bolt rod, which can solve the "cold bridge effect" problem. However, the low strength, low stiffness and easy aging of SBS itself determine that it cannot meet the needs of modern composite insulation layer anchoring. Therefore, in order to solve the above problems, a building insulation layer anchoring structure using composite materials is proposed. Utility Model Content

[0014] The key to anchoring the composite insulation layer is to avoid using metal materials with high thermal conductivity in the anchor bolts while ensuring a firm and durable bond with the wall, and to minimize the thermal conductivity cross-sectional area of ​​the anchor bolts, thereby reducing the heat dissipation loss caused by the anchor bolts.

[0015] To this end, this case designed a thermal insulation layer anchoring method using composite materials.

[0016] The specific method is: a fiber reinforced resin composite material (FRP) anchor bolt is manufactured with a thermosetting resin as a matrix and a low thermal conductivity reinforcing fiber as a reinforcing phase, and the anchor bolt is used as the main structure of the anchor bolt that penetrates the insulation layer and penetrates into the foundation wall; the volume ratio of the reinforcing fiber in the FRP anchor bolt is not less than 25%, at least 30% of the reinforcing fibers have an angle of less than 5° with the length direction of the anchor bolt, the thermal conductivity of the anchor bolt rod body is k≤2W / (m·K), the tensile strength is ≥300MPa, the shear strength is ≥60MPa, the binding force between the anchor bolt rod body and the foundation wall under the pulling action is F1≥0.6KN, and the binding force between the anchor bolt rod body and the tray body is F2≥0.6KN. Under normal use conditions, after 70 years, the attenuation rate of the above indicators is not more than 30%;

[0017] The optimized design is that the reinforcing fibers of the fiber reinforced resin composite material (FRP) are inorganic non-metallic fiber materials or organic polymer materials with no electronic thermal conductivity; the matrix resin is a thermosetting organic resin, which is in a solidified state after manufacturing, and its microscopic changes are: the thermosetting organic resin polymer is cross-linked from a linear structure to a spatial body structure, the curing process is irreversible, and the aging speed in the natural environment is slow; the tray body is made of stainless steel material, and the anchor bolt assembly with the tray body is applied to the integrated formwork-free structure, which penetrates the insulation layer and extends into the concrete casting foundation wall, and plays the role of firmly combining the insulation layer with the concrete casting foundation wall; the integrated formwork-free structure has a removable formwork on one side and a non-removal formwork on the other side; the length L of the anchor bolt assembly is not less than 110% of the thickness A of the insulation layer; the length B of the tray body does not exceed 90% of the thickness A of the insulation layer;

[0018] The optimized design is that the reinforcing fibers of the FRP reinforcement anchor bolts are made of glass fiber material, namely: glass fiber reinforced resin composite material GFRP;

[0019] The optimized design is that the reinforcing fiber of the FRP reinforcement anchor bolt is made of basalt fiber material, namely: basalt fiber reinforced resin composite material BFRP;

[0020] The optimized design is that the reinforcing fibers of the FRP reinforcement anchor bolts are made of organic fiber materials with no electronic thermal conductivity, including aramid fibers, namely: aramid fiber reinforced resin composite material AFRP;

[0021] The optimized design is that the outer cylindrical surface of the FRP reinforcement anchor bolt has an external thread, and the external thread can cooperate with the internal thread of the external thread tray body to form an external thread anchor bolt assembly with an external thread tray body;

[0022] The optimized design is that the tray body is made of thermosetting resin material, which has excellent durability;

[0023] The optimized design is that the pallet body is made of FRP material, which has excellent durability;

[0024] The optimized design is that the pallet body is an integral body consisting of the fixed tube and the pallet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0026] Figure 1 The utility model anchor bolt assembly is an anchor bolt assembly formed by connecting the FRP reinforcement anchor bolt and the pallet body, and the pallet body is an integrated figure consisting of the pallet and the fixing pipe;

[0027] Figure 2 The utility model is a diagram showing an anchor assembly with a total length of L penetrating a thermal insulation layer with a thickness of A, and B is a length diagram of a tray body;

[0028] Figure 3 The utility model has a removable formwork on one side and a non-removable formwork on the other side and a pouring base wall diagram;

[0029] Figure 4 The external thread anchor assembly in the utility model is formed by connecting the external thread anchor assembly with a tray body, and the tray body is formed by the tray and the internal thread pipe as an integral figure;

[0030] Figure 5 It is a length diagram of the external threaded anchor bolt assembly with a total length of M penetrating the insulation layer with a thickness of A and the pallet body in the utility model;

[0031] Figure 6 The utility model discloses a detachable formwork and a non-detachable formwork on the other side and a pouring base wall diagram, which are anchored by an external threaded anchor bolt assembly.

[0032] Legend:

[0033] 1. Removable formwork; 2. Foundation wall; 3. Insulation layer; 4. FRP reinforcement anchor bolts; 5. Non-removable formwork; 6. Pallet; 7. Pallet body; 8. Fixing pipe; 9. Anchor bolt assembly; 10. Externally threaded pallet body; 11. Internally threaded fixing pipe; 12. Externally threaded anchor bolt assembly. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Example 1

[0036] See also Figure 1-3 The FRP reinforcement anchor bolt 4 is made of organic fiber material with no electronic thermal conductivity, wherein the volume ratio of the reinforcing fiber is 25%, 30% of the reinforcing fiber has an angle of less than 5° with the length direction of the anchor bolt, the thermal conductivity of the anchor bolt rod body is k≤2W / (m·K), the tensile strength is ≥300MPa, the shear strength is ≥60MPa, the binding force F1 between the anchor bolt rod body and the foundation wall under the pulling action is ≥0.6KN, and the binding force F2 between the anchor bolt rod body and the tray body (7) is ≥0.6KN; the tray body 7 is made of thermosetting resin material;

[0037] The first step is to connect the FRP reinforcement anchor bolt 4 and the pallet body 7 to form an anchor bolt assembly 9;

[0038] The second step is to penetrate the insulation layer 3 with a thickness of A with a vertical error of 90°±15° through the anchor assembly 9 with a total length of L. The length L of the anchor assembly 9 is 110% of the thickness A of the insulation layer 3, and the length B of the tray body 7 is 30% of the thickness A of the insulation layer 3.

[0039] The third step is to support the removable formwork 1 on one side and the non-removal formwork 5 on the other side, cast the base wall 2, form a wall with an insulation layer 3 and the non-removal formwork 5, and remove the removable formwork 1 after the base wall 2 reaches the solidification condition.

[0040] Example 2

[0041] See also Figure 4-6, the FRP reinforcement anchor bolt 4 is made of organic fiber material with no electronic thermal conductivity, and the tray body 7 is made of thermosetting resin material;

[0042] In the first step, the FRP reinforcement anchor bolt 4 is screwed into the externally threaded tray body 10 to form an externally threaded anchor bolt assembly 12 .

[0043] The second step is to penetrate the insulation layer 3 with a thickness of A with a direction within a vertical error range of 90°±15° through the external threaded anchor assembly 12 with a total length of L. The length L of the anchor assembly 9 is 120% of the thickness A of the insulation layer 3, and the length B of the external threaded tray body 10 is 30% of the thickness A of the insulation layer 3;

[0044] The third step is to support the removable formwork 1 on one side and the non-removal formwork 5 on the other side, cast the base wall 2, form a wall with an insulation layer 3 and the non-removal formwork 5, and remove the removable formwork 1 after the base wall 2 reaches the solidification condition.

[0045] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A building insulation layer anchoring structure using composite materials, characterized by: The invention comprises a reinforcement anchor bolt (4) and a tray body (7); the reinforcement anchor bolt (4) and the tray body (7) are integrated to form an anchor bolt assembly (9); the reinforcement anchor bolt (4) is a fiber reinforced resin composite material FRP, which serves as an anchor bolt main body structure that penetrates the thermal insulation layer (3) and penetrates into the foundation wall (2); the thermal conductivity k of the anchor bolt main body is ≤2W / (m·K), the tensile strength is ≥300MPa, the shear strength is ≥60MPa, the binding force F1 between the anchor bolt main body and the foundation wall under pulling action is ≥0.6KN, and the binding force F2 between the anchor bolt rod body and the tray body (7) is ≥0.6KN.

2. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The reinforcement anchor bolt (4) and the tray body (7) are integrated by hot-melt bonding to form an anchor bolt assembly (9).

3. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The reinforcing fibers of the fiber reinforced resin composite material FRP are inorganic non-metallic fiber materials or organic polymer materials with no electronic thermal conductivity; the matrix resin is a thermosetting organic resin; the tray body (7) is made of stainless steel; the anchor bolt assembly (9) with the tray body (7) penetrates the insulation layer (3) and extends into the concrete cast foundation wall (2) to form an integrated formwork-free structure; the integrated formwork-free structure has a detachable formwork (1) on one side and a non-detachable formwork (5) on the other side; the length L of the anchor bolt assembly (9) is not less than 110% of the thickness A of the insulation layer (3); and the length B of the tray body (7) is not more than 90% of the thickness A of the insulation layer (3).

4. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The reinforcing fibers of the reinforcement anchor bolt (4) are made of glass fiber material, namely, glass fiber reinforced resin composite material GFRP.

5. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The reinforcing fibers of the reinforcement anchor bolt (4) are made of basalt fiber material, namely basalt fiber reinforced resin composite material BFRP.

6. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The reinforcing fibers of the reinforcement anchor bolt (4) are made of organic fiber materials with no electronic thermal conductivity, including aramid fibers, namely aramid fiber reinforced resin composite material AFRP.

7. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The outer cylindrical surface of the reinforcement anchor bolt (4) is provided with an external thread, and the tray body (7) is also provided with an external thread.

8. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The tray body (7) is made of thermosetting resin material.

9. The anchoring structure of a building insulation layer using a composite material as claimed in claim 1, characterized in that: The tray body (7) is made of FRP material.

10. The anchoring structure of a building thermal insulation layer using a composite material as claimed in claim 1, characterized in that: The tray body (7) is an integral body consisting of a fixing tube (8) and a tray (6).

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