Fabricated efficient thermal insulation wallboard and shear test system thereof

Abstract

The invention discloses a fabricated efficient thermal insulation wallboard and a shear test system thereof.The fabricated efficient thermal insulation wallboard comprises a thermal insulation wallboard body; the thermal insulation wallboard body comprises two layers of concrete slabs and a thermal insulation layer arranged between the two layers of concrete slabs, and the two layers of concrete slabs are fixedly connected through a connecting piece; the two layers of concrete slabs respectively comprise an anti-crack mortar surface layer and a light aggregate fireproof layer which are sequentially arranged from the outer layer to the inner layer; the heat preservation wallboard has the advantages of being efficient in heat preservation, fireproof, light in weight and good in anti-seismic property, is suitable for ultra-low energy consumption buildings, and further has the advantage of being fast in construction due to the fact that the heat preservation wallboard is a full-prefabricated wallboard.

Description

Technical Field

[0001] The invention relates to the technical field of shear test platforms, and more particularly to an assembled high-efficiency thermal insulation wallboard and a shear test system thereof. Background Art

[0002] Precast concrete composite wall panels are structures composed of two layers of inner and outer concrete wall panels and a thermal insulation layer in between. This type of wall panel not only has the functions of bearing and enclosure, but also has a good thermal insulation effect. It is an indispensable part of prefabricated buildings. In this wall panel structure, multiple connectors are usually set to form a crossarm system. This system is responsible for tightly connecting the inner and outer concrete wall panels with the insulation layer to form a unified force-bearing unit. The mechanical properties of the crossarm system play a key role in the overall performance of the composite wall panel. When using precast concrete composite wall panels, the crossarm system composed of multiple connectors needs to withstand shear forces, including the deadweight of the exterior wall panels, the load caused by temperature changes, and the vertical seismic effect. Under the action of these forces, the crossarm system may suffer shear failure.

[0003] Therefore, in order to ensure the safety and stability of the wall panels during use and prevent the exterior wall panels from falling off, it is crucial to study the shear strength of the connectors in the wall panel specimens. Summary of the invention

[0004] The purpose of the present invention is to provide an assembled high-efficiency thermal insulation wall panel and a shear test system thereof, by connecting two layers of concrete slabs with different connectors, thereby improving the stress-bearing performance and impact resistance of the thermal insulation wall panel.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An assembled high-efficiency thermal insulation wall panel comprises: a thermal insulation wall panel body; the thermal insulation wall panel body comprises: two layers of concrete panels and a thermal insulation layer arranged between the two layers of concrete panels. The two layers of concrete panels are fixedly connected by a connecting piece;

[0007] The two layers of concrete slabs respectively include: from the outer layer to the inner layer, an anti-cracking mortar surface layer and a lightweight aggregate fireproof layer;

[0008] A galvanized steel wire mesh is also provided in the light aggregate fireproof layer.

[0009] Furthermore, the connecting piece includes: a plurality of I-shaped connecting pieces, and both ends of each of the I-shaped connecting pieces are respectively fixed on the lightweight aggregate fireproof layer of the two layers of concrete wall panels.

[0010] Furthermore, the plurality of I-shaped connectors are provided with five, wherein every two of the I-shaped connectors are respectively provided at two sides of the thermal insulation wall panel, and one of the I-shaped connectors is provided in the middle of the thermal insulation wall panel;

[0011] The lateral spacing between the I-shaped connectors on both sides of the insulation wall panel is 400mm; the longitudinal spacing between the I-shaped connectors on both sides of the insulation wall panel is 550mm; the spacing between the I-shaped connectors on both sides of the insulation wall panel and the wall edge of the insulation wall panel is 200mm; the anchoring depth at both ends of the several I-shaped connectors is 40mm.

[0012] Furthermore, the material of the light aggregate fireproof layer is: SG ultra-light polymer aggregate concrete;

[0013] The connecting piece is specifically: a resin fiber tie piece;

[0014] The lightweight aggregate fireproof layer is specifically lightweight aggregate concrete.

[0015] Furthermore, the height of the insulation wall panel is 3000mm, the width of the insulation wall panel is 600mm, and the thickness of the insulation wall panel is 300mm; wherein, the thickness of the two layers of concrete slabs are 50mm respectively, the thickness of the insulation layer is 200mm, the thickness of the lightweight aggregate fireproof layer is 40mm, and the thickness of the anti-cracking mortar surface layer is 10mm.

[0016] Furthermore, 5 connectors are arranged per square meter on the insulation wall body, and the connectors are rod-shaped connectors, which are connected to two layers of concrete wall panels via sleeves, and the sleeves are provided with spiral patterns, and the end diameter of the sleeve is twice the diameter of the sleeve body.

[0017] Furthermore, the connecting piece further comprises: a plurality of grooves are provided on both sides of the thermal insulation layer, the light aggregate fireproof layer is provided with a plurality of protrusions corresponding to the plurality of grooves, and the plurality of grooves and the plurality of protrusions are matched and assembled one by one;

[0018] The depth of the groove is 40 mm, and the groove is provided with an inclination angle of 60°.

[0019] Furthermore, the thermal insulation layer is specifically: a modified polyurethane thermal insulation layer;

[0020] The thermal conductivity of the modified polyurethane thermal insulation layer is not greater than 0.020 W / m·K.

[0021] The present invention also provides a shear test system for assembled high-efficiency thermal insulation wall panels, comprising a thermal insulation wall panel body, a platform base, and a load applying device and a sensor arranged on the platform base;

[0022] The insulation wall panel body is placed horizontally on the platform base, one end of the insulation wall panel body is loaded by the load applying device, and the other end of the insulation wall panel body is provided with a displacement resistance member, which is used to prevent the insulation wall panel body from being displaced; the concrete slab on the side of the insulation wall panel body close to the platform base is against the displacement resistance member.

[0023] Furthermore, a displacement meter is provided on the side of the thermal insulation wall panel, and the displacement meter is used to measure the relative displacement between the two layers of concrete slabs;

[0024] The end of the thermal insulation wall panel body close to the load applying device has the thermal insulation layer removed and a steel pipe inserted therethrough. The steel pipe is used to prevent one end of the thermal insulation wall panel body from tilting up during the load application process.

[0025] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0026] The present invention connects two layers of concrete wall panels and an insulation layer together through different connectors, so that the insulation wall panel can absorb impact energy and reduce damage when subjected to an accidental impact; it can maintain structural integrity and stability for a certain period of time in the event of a fire; and utilizes a jack to apply a force response to one side of the concrete wall panel, including key parameters such as displacement and stress, to effectively simulate and apply shear force, thereby evaluating the performance of the insulation wall panel under a shear state; directly applying a load applying device to the side where the insulation layer is removed is conducive to uniform distribution of force, thereby reducing measurement errors caused by uneven force distribution; the force applied by the load applying device, combined with data collection by a sensor, can effectively evaluate the safety performance of the connectors in the insulation wall panel specimen under the action of shear force. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] The following is a further description of the present invention using an assembled high-efficiency thermal insulation wallboard and a shear test system thereof in conjunction with the accompanying drawings;

[0029] Figure 1 It is a schematic diagram of a thermal insulation wall panel test piece of an I-shaped connector in an assembled high-efficiency thermal insulation wall panel provided by the present invention;

[0030] Figure 2 It is a schematic diagram of a wall panel test piece in which the connection members of the assembled high-efficiency thermal insulation wall panel provided by the present invention are correspondingly connected with the grooves and the protrusions;

[0031] Figure 3 It is a schematic diagram of the overall structure of the assembled high-efficiency thermal insulation wall panel provided by the present invention;

[0032] Figure 4 It is a schematic diagram of a load-displacement curve of a thermal insulation wall panel specimen in which the connection members in the assembled high-efficiency thermal insulation wall panel provided by the present invention are correspondingly connected grooves and protrusions;

[0033] Figure 5 It is a schematic diagram of the load-displacement curve of the wall panel specimen of the I-shaped connector in the assembled high-efficiency thermal insulation wall panel provided by the present invention.

[0034] In the figure, 1. load applying device; 2. sensor; 3. steel pipe; 4. groove; 5. anti-cracking mortar surface layer; 6. thermal insulation layer; 7. lightweight aggregate fireproof layer; 8. I-shaped connector. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0037] like Figure 1 As shown, the present invention provides an assembled high-efficiency thermal insulation wall panel and a shear test system thereof, the assembled high-efficiency thermal insulation wall panel comprising: a thermal insulation wall panel body; the thermal insulation wall panel body comprising: two layers of concrete slabs and a thermal insulation layer 6 arranged between the two layers of concrete slabs, the two layers of concrete slabs being fixedly connected by a connecting piece;

[0038] The two layers of concrete slabs respectively include: from the outer layer to the inner layer, an anti-cracking mortar surface layer 5 and a lightweight aggregate fireproof layer 7;

[0039] The light aggregate fireproof layer 7 is also provided with a galvanized steel wire mesh.

[0040] The connecting member comprises: a plurality of I-shaped connecting members 8, both ends of each of the I-shaped connecting members 8 are respectively fixed on the light aggregate fireproof layer 7 of the two layers of concrete wall panels;

[0041] The material of the lightweight aggregate fireproof layer is: SG ultra-lightweight polymer aggregate concrete;

[0042] The I-shaped connecting piece 8 is specifically: a resin fiber tie piece;

[0043] The lightweight aggregate fireproof layer 7 is specifically lightweight aggregate concrete.

[0044] The height of the insulation wall panel is 3000mm, the width of the insulation wall panel is 600mm, and the thickness of the insulation wall panel is 300mm; wherein, the thickness of the two layers of concrete slabs is 50mm respectively, the thickness of the insulation layer is 200mm, the thickness of the lightweight aggregate fireproof layer 7 is 40mm, and the thickness of the anti-cracking mortar surface layer 5 is 10mm.

[0045] It should be noted that the thermal insulation wall panels in this application are not limited to the above-mentioned fixed sizes and can be adjusted according to actual conditions.

[0046] There are five I-shaped connectors 8, wherein two of the I-shaped connectors are respectively arranged on both sides of the insulation wall panel, and one I-shaped connector is arranged in the middle of the insulation wall panel;

[0047] The lateral spacing between the I-shaped connectors 8 on both sides of the insulation wall panel is 400mm; the longitudinal spacing between the I-shaped connectors 8 on both sides of the insulation wall panel is 550mm; the spacing between the I-shaped connectors 8 on both sides of the insulation wall panel and the wall edge of the insulation wall panel is 200mm; the anchoring depth at both ends of the several I-shaped connectors is 40mm.

[0048] The connecting pieces are arranged 5 per square meter on the insulation wall body. The connecting pieces are rod-shaped connecting pieces. The connecting pieces are connected to two layers of concrete wall panels via sleeves. The sleeves are spiral-shaped. The diameter of the ends of the sleeves is twice the diameter of the sleeve body.

[0049] The connecting piece also includes: a plurality of grooves 4 are provided on both sides of the thermal insulation layer, and a plurality of protrusions corresponding to the plurality of grooves 4 are provided on the light aggregate fireproof layer 7, and the plurality of grooves 4 and the plurality of protrusions are matched and assembled one by one;

[0050] The depth of the groove is 40 mm, and the groove is provided with an inclination angle of 60°.

[0051] The thermal insulation layer 6 is specifically: a modified polyurethane thermal insulation layer;

[0052] The thermal conductivity of the modified polyurethane thermal insulation layer is not greater than 0.020 W / (m·K).

[0053] The present invention also provides a shear test system for assembled high-efficiency thermal insulation wall panels, comprising a thermal insulation wall panel, a platform base, and a load applying device 1 and a sensor 2 arranged on the platform base;

[0054] The insulation wall panel is placed horizontally on the platform base, one end of the insulation wall panel is loaded by the load applying device 1, and the other end of the insulation wall panel is provided with a displacement resistance member, which is used to prevent the insulation wall panel from displacement; the concrete slab on the side of the insulation wall panel close to the platform base is against the displacement resistance member.

[0055] A displacement meter is provided on the side of the wall panel, and the displacement meter is used to measure the relative displacement between the two layers of concrete slabs;

[0056] The end of the thermal insulation wall panel close to the load applying device 1 has the thermal insulation layer 6 removed and a steel pipe inserted therethrough. The steel pipe is used to prevent one end of the thermal insulation wall panel from tilting during the load application process.

[0057] The following is an example of a shear test on a prefabricated high-efficiency thermal insulation wall panel using a shear test system:

[0058] Example 1

[0059] The present invention provides a test process of connecting the inner leaf concrete wall panel, the outer leaf concrete wall panel and the insulation layer 6 by different connecting members, and testing the shear resistance of different connecting members:

[0060] For the convenience of expression, in this embodiment, the two layers of concrete slabs are represented by an inner leaf concrete slab and an outer leaf concrete slab respectively.

[0061] 1. In the present invention, the inner leaf concrete slab and the outer leaf concrete slab are connected one-to-one with the grooves provided in the insulation layer through protrusions. The overall size of the wall panel specimen is 960mm×600mm×300mm (height×width×length), the thickness of the inner leaf concrete wall panel and the outer leaf concrete wall panel is 50mm, and the thickness of the insulation layer is 200mm.

[0062] 2. In the manner in which the inner leaf concrete slab and the outer leaf concrete slab are connected to the insulation layer 6 by a plurality of I-shaped connectors 8, the overall size of the wall panel specimen is 950mm×260mm×600mm (height×width×length); the thickness of the inner leaf concrete slab and the outer leaf concrete slab is 50mm, and the thickness of the insulation layer 6 is 160mm; there are 5 I-shaped connectors 8, 4 of which are symmetrically arranged at the 4 ends of the insulation wall panel, and the other is arranged in the middle of the insulation wall panel, each I-shaped connector 8 is 240mm long, 35mm high, 20mm long at the bottom, and 4mm thick at the waist; the lateral spacing between every two I-shaped connectors 8 is 400mm, and the longitudinal spacing is 550mm, the spacing between each I-shaped connector 8 and the wall edge of the insulation wall panel is 200mm, and the anchoring depth at both ends of the I-shaped connector 8 is 40mm.

[0063] Test process:

[0064] A loading beam is provided on the top of the jack to ensure uniform force on the loading end during the loading process of the wall panel specimen by the jack. The cross section of the loading beam is 100mm×68mm×4.5mm and the length is 800mm. Loading is carried out in a displacement loading mode. During the loading process, the loading displacement is controlled by pressing the jack by hand three times each time. During the test, the displacement of the inner and outer leaf wall panels is obtained by a dial indicator. The force applied by the jack at the loading end is read by the force sensor through a digital display. Specifically:

[0065] (1) The experimental component is composed of inner and outer concrete panels, which are connected to the insulation layer 6 in different ways. The left end of the outer concrete panel is against the wall panel (meaning that it cannot move to the left). Then part of the insulation 6 is removed, and two steel pipes are placed in the removed insulation layer 6. The two ends of the steel pipes are fixed to prevent the sandwich wall panel from lifting upward during loading. The test applies a horizontal left load to the inner concrete panel through a jack, and the connector will bear a horizontal left shear load until the specimen is damaged (the connector is sheared or the connector is pulled out of the concrete) or the horizontal relative displacement between the inner and outer concrete reaches the specified value allowed by the relevant specifications, and the test is declared over. The concrete displacement is observed when the bottom of the single-side wall panel protrudes 50mm high concrete.

[0066] (2) The loading instrument is a hydraulic jack, the center line of the jack coincides with the midpoint of the wall panel. To ensure uniform load transfer, a Q235 I-beam distribution beam is placed under the jack, and a tension and pressure sensor is placed horizontally above the jack to record the applied load size and the relative displacement of the inner and outer wall panels in real time. The cross-section of the I-beam distribution beam is 100mm×68mm×4.5mm and the length is 800mm, which can ensure that the loading end is evenly stressed during the loading process.

[0067] (3) Install two displacement meters on the side of the wall panel to measure the relative displacement of the inner wall panel and the outer wall panel. The groove form is connected to the middle surface of each outer leaf concrete panel with a strain gauge; the FRP connector form is connected to the middle of the connector with a strain gauge. Check whether the steel bars and strain gauge resistance values ​​arranged in the wall panel specimen meet the requirements. Use the DH3818Y static strain tester to collect the strain of the outer leaf concrete panel during the test.

[0068] (4) During the formal loading, the load is loaded in multiple stages, with each stage increasing by about 5% of the ultimate load, and the load holding time is 5 minutes. Until cracks appear in the wall panel or the anchoring of the connector fails, observe and record the wall panel failure form and failure process, as well as stress and strain. When the specimen is judged to be damaged, stop loading, remove the instruments and equipment, and prepare for the next test.

[0069] Realization phenomenon:

[0070] For the sake of convenience, the method in which the inner leaf concrete slab and the outer leaf concrete slab are connected one-to-one with the protrusions and the grooves provided in the insulation layer 6 is named "SW-1"; the method in which the inner leaf concrete wall panel and the outer leaf concrete slab are connected to the insulation layer through a number of I-shaped connectors 8 is named "SW-2".

[0071] During the test loading process, as the load increased, both SW-1 and SW-2 made a "hissing" sound. The final failure form of SW-1 was a through crack from the lower loading end to the tail of the wall panel specimen, and the final failure form of SW-2 was the failure of the I-shaped connector 8. When SW-1 was loaded to 1.11kN, it began to make a sound, and a slight crack appeared at the lower loading end. When loaded to 1.545kN, the crack changed from slight to obvious. When loaded to 2.059kN, the crack increased and slowly extended to the tail, and the loading end slightly tilted upward. When loaded to 2.82kN, the crack extended to the tail. When loaded to 3.55kN, a unilateral through crack appeared. After that, the load value began to decrease. When loaded to 2.965 When the load was increased to 14.95 kN, a through crack appeared at the tail. When it was loaded to 17.85 kN, both sides were penetrated and the insulation layer was completely sheared off. When SW-2 was loaded to 29.34 kN, a slight crack appeared and the loading end showed an obvious upward trend. When it was loaded to 33 kN, a "bang" was heard and the connector was damaged. If loading was continued at this time, the load value would decrease instead.

[0072] Analysis of test results:

[0073] (1) SW-1 specimen

[0074] like Figure 4 As shown, there is no I-shaped connector 8 inside the SW-1 specimen, and grooves are used to connect the inner and outer blades, and the shear force is completely provided by the middle insulation layer 6. Figure 4 This is the load-displacement curve of the SW-1 specimen. In the early stage of loading, the specimen is in the elastic stage, and the load and displacement are approximately linear (OA segment). When the load exceeds 1.11 kN, the insulation wall panel begins to make a sound, and the load and displacement increase non-proportionally (AC segment). When the load exceeds 1.545 kN, the load and displacement show a nonlinear relationship until the insulation wall panel is destroyed. The load peak is 3.55 kN.

[0075] The deadweight of the SW-1 single-sided concrete wall panel is 0.172 kN. At this time, the relative displacement of the inner and outer leaf panels is 0.135 mm. This relative displacement meets the deformation limit of 2.54 mm required by AC320 of the Acceptance Standard for Fiber-Reinforced Composite Connectors Anchored in Concrete.

[0076] (2) SW-2 specimen

[0077] The SW-2 specimen uses an I-shaped connector 8 to connect the inner and outer blades. The shear force is mainly provided by the I-shaped connector 8. Figure 4 It can be seen that the insulation layer 6 provides a shear resistance of 3.62 kN for the specimen without connectors, and an average of 6.28 kN per square meter. Figure 5 It can be seen that the shear resistance of the connector specimen is 33kN provided by the insulation layer 6 and the connector. After deducting the shear force provided by the insulation layer, the five connectors jointly bear a shear force of 29.38kN, and each connector can provide an average shear force of 5.876kN. The deadweight of the SW-2 single-sided concrete wall panel is 0.16kN. At this time, the relative displacement of the inner and outer leaf wall panels is 0.176mm, which meets the deformation limit of 2.54mm in the AC320 standard of the Acceptance Standard for Fiber-Reinforced Composite Connectors Anchored in Concrete.

[0078] Embodiment 2:

[0079] Solution 1: The connector adopts an I-shaped connector 8. To increase the anchoring depth and improve the anchoring force, the connector is set as follows: the anchoring depth of the I-shaped connector is 20 mm, and the I-shaped connector is 25 mm away from the outer surface of the wall;

[0080] Option 2: Dig a cylindrical groove in the insulation layer, fill it with lightweight aggregate concrete, and use I-shaped connectors to fix the two layers of concrete slabs. The anchoring depth of the I-shaped connector is 40mm, and the end of the I-shaped connector is 25mm away from the outer surface of the wall.

[0081] The two layers of concrete slabs respectively include: from the outer layer to the inner layer, they are an anti-cracking mortar surface layer and a light aggregate fireproof layer. A galvanized steel wire mesh is also provided in the light aggregate fireproof layer. The anti-cracking mortar surface layer has the functions of waterproofing the surface layer and resisting cracking of the surface layer.

[0082] Light aggregate fireproof layer: The main function is to increase the bearing capacity of the wallboard and prevent fire together with the anti-cracking mortar. SG ultra-light polymer aggregate fireproof and thermal insulation concrete is selected.

[0083] Modified polyurethane insulation layer: the main function is thermal insulation; the modified polyurethane insulation layer has the effects of low thermal conductivity, good fire resistance, and low water absorption.

[0084] I-shaped connector 8: Its main function is to connect the inner and outer leaves of the wall panel to avoid thermal bridges.

[0085] The thermal insulation wall panels of the present invention are respectively subjected to impact resistance test, bending bearing capacity test, compressive strength test, softening coefficient test, surface density test, hanging force test, water absorption test, freeze-thaw resistance test and weather resistance test.

[0086] (1) Impact resistance test:

[0087] The length of the test strip should not be less than 2.4m.

[0088] Take 3 strips as a group of samples, and the center distance between the upper and lower steel pipes is the length of the board minus 100mm, that is, (L-100)mm. The board joints are bonded with special mortar compatible with the board material, the boards are squeezed tightly, the joints are overlapped with glass fiber cloth, and compacted and smoothed with mortar.

[0089] After 24 hours, a standard sandbag filled with 30kg of fine sand with a particle size of less than 2mm is fixed to a steel ring with its center 100mm away from the insulation wall panel surface using a rope with a diameter of about 10mm, so that the center of gravity of the sandbag in a suspended state is at a height of L / 2.

[0090] (2) Compressive strength test:

[0091] Insulation wall panels with a thickness equal to the thickness of the strip board, a width of 100 mm, and a length of 100 mm are cut in sequence along the width direction of the strip board (for hollow strip boards, the length includes a unit specimen with a complete hole and two complete ribs between the holes), and 3 pieces form a group of samples.

[0092] Treat the upper and lower surfaces of the insulation wallboard to make them parallel to each other and perpendicular to the cylindrical axis of the test specimen hole. Cement mortar can be prepared to treat the upper and lower surfaces, and adjusted to a level with a level ruler.

[0093] Place the insulation wall panel on the pressure plate of the testing machine, so that the axis of the insulation wall panel coincides with the pressure center of the pressure plate of the testing machine, and apply load at a speed of 0.05MPa / s to 0.10MPa / s until the insulation wall panel is destroyed. Record the maximum destruction load P.

[0094] The compressive strength of each insulation wall panel is calculated according to the following formula, accurate to 0.1MPa.

[0095]

[0096] In the above formula, R is the compressive strength of the insulation wall panel specimen, in megapascals (MPa); P is the failure load, in Newtons (N); l is the length of the compression surface of the insulation wall panel, in millimeters (mm); b is the width of the compression surface of the specimen, in millimeters (mm).

[0097] (3) Softening coefficient test:

[0098] Take a test strip and cut specimens along the length of the strip, that is, specimens with a width of 100 mm and a length of 100 mm, a total of 6 pieces, divided into two groups of samples, 3 pieces in each group (for hollow strips, the length includes a unit specimen with a complete hole and two complete ribs between the holes).

[0099] The upper and lower surfaces of the specimen are processed to form planes parallel to each other and perpendicular to the cylindrical axis of the specimen hole. If necessary, cement mortar can be prepared to process the upper and lower surfaces, and adjusted to a horizontal level with a level ruler.

[0100] After the specimens are processed, they are baked in an oven to constant weight, and then a group of three specimens are immersed in water at 20℃±2℃, taken out after 72 hours, and the surface is wiped dry with warm wool. Then, they are subjected to compressive strength test on a press together with another group of specimens that have not been immersed in water.

[0101] The softening coefficient of each specimen is calculated as follows:

[0102]

[0103] In the above formula, I is the softening coefficient, R 1 is the average compressive strength of the specimen under saturated water-containing state, in MPa; R 0 It is the average compressive strength of the specimen under absolute conditions, in MPa.

[0104] (4) Surface density test:

[0105] Take 3 test strips as a group of samples for testing, and weigh the weight G of the test strips with a precision of not less than 0.5kg.

[0106] The surface density of each test strip is calculated according to the following formula, accurate to 0.5kg / m.

[0107]

[0108] In the above formula, ρ is the surface density of the test strip, in kg / m 2 ; G is the weight of the test strip, in kg; L is the length of the test strip, in m; B is the width of the test strip, in m.

[0109] (5) Bending bearing capacity test:

[0110] The length of the insulation wall panel should not be less than 2.4m.

[0111] The strip board that has completed the surface density test is simply supported on two parallel supports whose support length is greater than the board width. One is a fixed hinge support and the other is a rolling hinge support. The middle distance between the supports is adjusted to (L-100) mm, and the protruding lengths at both ends are equal.

[0112] (6) Test the hanging force:

[0113] Take a test strip board, cut a hole with the size of 50mm×40mm×90mm in depth multiplied by height multiplied by width at 2000mm in the middle of the board, clean the residual ash, and bond with cement water glass slurry (or other adhesives). The distance between the hanging hole and the board surface is 100mm; after 24 hours, check whether the hanging is firmly installed, otherwise reinstall it.

[0114] Through the circular hole of the steel plate hanging piece, load is applied in two stages. The first stage is 500N, and it is left to stand for 2 minutes. The second stage is 500N, and it is left to stand for 24 hours. Observe whether there are cracks with a width of more than 0.5mm on the plate surface around the hanging area, and record the test results.

[0115] (7) Test the water absorption of the specimen:

[0116] 1. The insulation wall panel specimen consists of insulation layer, leveling layer, anti-cracking layer and finishing layer. The specimen size, quantity and state adjustment shall meet the following requirements;

[0117] a) The size is 200mmX200mmm, the quantity is 3;

[0118] b) After the sample is prepared, it is cured under standard curing conditions for 7 days, and then the four sides of the insulation wall panel specimen (including the insulation material) are sealed and waterproofed, and the specimen is pretreated as follows:

[0119] ① Cycle the specimen three times according to the following steps:

[0120] Immerse the insulation wall panel facing layer downward in a water tank in the test environment for 24 hours, with the immersion depth being 3mm to 10mm; and dry at (50+5)℃ for 24 hours.

[0121] ② After completing the cycle, the specimen shall be placed in the test environment for no less than 24 hours.

[0122] 2. Test steps

[0123] Weigh the mass of the specimen before immersion in water m 0 After that, immerse the specimen with the surface layer facing downward into room temperature water to make the surface completely wet. The immersion depth is 3mm to 10mm (the thickness of the anti-cracking layer and the surface layer). Take it out after soaking for 1 hour, quickly wipe off the water on the surface of the specimen within 1 minute, and weigh the mass of the specimen after immersion. 1 .

[0124] 3. Test results

[0125] The water absorption is calculated according to the following formula, and the arithmetic mean of the three test data is taken;

[0126]

[0127] In the above formula, M is the water absorption, m 1is the mass of the specimen after immersion, m 0 is the mass of the specimen before immersion, and A is the area of ​​the specimen surface immersed in water.

[0128] (8) Freeze-thaw resistance and weather resistance

[0129] 1. Freeze-thaw resistance

[0130] The test is carried out in the following steps:

[0131] (a) The insulation wall panel specimens are subjected to 30 freeze-thaw cycles, each cycle lasting 24 hours. The specimens are immersed in water at (23±2)℃ for 8 hours, with the facing layer facing downwards, and the depth of immersion in water is 3mm to 10mm. Then, they are frozen at (-20±2)℃ for 16 hours as one cycle. When the test needs to be interrupted, the specimens should be stored at (-20±2)℃;

[0132] (b) After each immersion, take out the specimen, wipe off the surface water, observe whether the specimen has cracks, powdering, hollowing, peeling, etc. and make a record. If there are cracks, powdering, hollowing, peeling, etc., record their number, size and location, and indicate the number of cycles when they occur;

[0133] (c) After the freeze-thaw cycle, condition the product under standard curing conditions for 7 days.

[0134] (9) Pull-out test

[0135] (a) Continuous loading

[0136] The load is applied to the anchor bolt at a uniform rate until the load reading of the tester stops increasing (i.e. failure). Or the load is loaded to the load test value or the displacement value at the load test value, and the load is maintained for 2 minutes. The loading rate is 25% to 400% of the anchor bolt failure load or load test value per minute. In addition to the test equipment being able to provide an accurate and continuous load-displacement curve, the total test time is a minimum of 1 minute and a maximum of 4 minutes. Before reaching the failure load or load test value, the reading should not be less than 5 times and recorded.

[0137] (b) Step loading

[0138] The load is added in constant increments to the failure load, or to the load test value or the displacement value at the load test value. Each incremental load should not exceed 10% of the expected failure load or load test value, and it should be maintained at this load for 1 minute. During the initial loading and the entire test process, records of the load and dial gauge or displacement sensor readings should be kept, including records after each load increase. The displacement readings when reaching the failure load or loading to the load test value or load test value should not be less than 10 times, and it should be maintained at the load test value or the displacement value at the load test value for 2 minutes. Draw a load-displacement test curve based on the test records, such as Figure 4 and Figure 5 shown.

[0139] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An assembled high-efficiency thermal insulation wall panel, characterized in that: include: Insulation wall panel body; The thermal insulation wall panel body comprises: two layers of concrete panels and a thermal insulation layer (6) arranged between the two layers of concrete panels, wherein the two layers of concrete panels are fixedly connected via a connecting piece; The two layers of concrete slabs respectively comprise: from the outer layer to the inner layer, an anti-cracking mortar surface layer (5) and a lightweight aggregate fireproof layer (7); A galvanized steel wire mesh is also provided in the light aggregate fireproof layer (7).

2. The assembled high-efficiency thermal insulation wall panel according to claim 1, characterized in that: The connecting piece comprises: a plurality of I-shaped connecting pieces (8), and two ends of each of the I-shaped connecting pieces (8) are respectively fixed to the lightweight aggregate fireproof layers (7) of the two layers of concrete wall panels.

3. The assembled high-efficiency thermal insulation wall panel according to claim 2 is characterized in that: The plurality of I-shaped connectors (8) are provided in five pieces; wherein two of the I-shaped connectors (8) are respectively provided on two sides of the thermal insulation wall panel, and one of the I-shaped connectors (8) is provided in the middle of the thermal insulation wall panel; The lateral spacing between the I-shaped connecting pieces (8) provided on both sides of the thermal insulation wall panel is 400 mm; the longitudinal spacing between the I-shaped connecting pieces (8) provided on both sides of the thermal insulation wall panel is 550 mm; the spacing between the I-shaped connecting pieces (8) provided on both sides of the thermal insulation wall panel and the wall edge of the thermal insulation wall panel is 200 mm; and the anchoring depth at both ends of the plurality of I-shaped connecting pieces (8) is 40 mm.

4. The assembled high-efficiency thermal insulation wall panel according to claim 2, characterized in that: The material of the light aggregate fireproof layer (7) is: SG ultra-light polymer aggregate concrete; The connecting piece is specifically: a resin fiber tie piece; The lightweight aggregate fireproof layer (7) is specifically lightweight aggregate concrete.

5. The assembled high-efficiency thermal insulation wall panel according to claim 4 is characterized in that: The height of the thermal insulation wall panel is 3000 mm, the width of the thermal insulation wall panel is 600 mm, and the thickness of the thermal insulation wall panel is 300 mm; wherein the thickness of the two layers of concrete slabs is 50 mm respectively, the thickness of the thermal insulation layer is 200 mm, the thickness of the lightweight aggregate fireproof layer (7) is 40 mm, and the thickness of the anti-cracking mortar surface layer (5) is 10 mm.

6. The assembled high-efficiency thermal insulation wall panel according to claim 1, characterized in that: The connecting pieces are arranged 5 per square meter on the insulation wall body. The connecting pieces are rod-shaped connecting pieces, which are connected to two layers of concrete wall panels via sleeves. The sleeves are provided with spiral patterns, and the diameter of the end of the sleeve is twice the diameter of the sleeve body.

7. The assembled high-efficiency thermal insulation wall panel according to claim 1, characterized in that: The connecting piece further comprises: a plurality of grooves (4) are provided on both sides of the thermal insulation layer, the light aggregate fireproof layer (7) is provided with a plurality of protrusions corresponding to the plurality of grooves (4), and the plurality of grooves (4) and the plurality of protrusions are matched and assembled one by one; The depth of the groove is 40 mm, and the groove is provided with an inclination angle of 60°.

8. The assembled high-efficiency thermal insulation wall panel according to claim 1, characterized in that: The thermal insulation layer (6) is specifically: a modified polyurethane thermal insulation layer; The thermal conductivity of the modified polyurethane thermal insulation layer is not greater than 0.020 W / m·K.

9. A shear test system for assembled high-efficiency thermal insulation wall panels, applied to the assembled high-efficiency thermal insulation wall panels according to any one of claims 1 to 8, characterized in that: It comprises a thermal insulation wall panel body, a platform base, and a load applying device (1) and a sensor (2) arranged on the platform base; The insulation wall panel body is placed horizontally on the platform base, one end of the insulation wall panel body is loaded by the load applying device (1), and the other end of the insulation wall panel body is provided with a displacement resistance member, which is used to prevent the insulation wall panel body from being displaced; the concrete slab on the side of the insulation wall panel body close to the platform base abuts against the displacement resistance member.

10. The shear test system for assembled high-efficiency thermal insulation wall panels according to claim 9, characterized in that: A displacement meter is also provided on the side of the thermal insulation wall panel, and the displacement meter is used to measure the relative displacement between the two layers of concrete slabs; At one end of the thermal insulation wall panel body close to the load applying device (1), the thermal insulation layer (6) is removed and a steel pipe is passed through, wherein the steel pipe is used to prevent one end of the thermal insulation wall panel body from tilting during the load application process.

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