Use rebound tester to detect auxiliary equipment of existing external wall insulation system

Abstract

The present invention relates to an auxiliary device for detecting an existing external wall external insulation system using a rebound tester, comprising a base plate; a plurality of holders are fixed on the front of the base plate, and a connecting component for fixed connection with an external device is fixedly arranged on the back; the holder is provided with a group of movable buckles which are limited in the holder and can move relative to the holder, and the movable buckles are used to directly clamp the rebound tester; the inner side of the fixed clamp is fixed to the outer side of the movable buckle, and the rebound tester is fixed to the holder by the radial clamping force of the clamp. The present invention provides an auxiliary device for detecting an existing external wall external insulation system using a rebound tester, which can quickly and quantitatively determine the damage status of the external wall external insulation system, improve the detection efficiency and accuracy, and provide a basis for the subsequent maintenance of the external wall external insulation system.

Description

Technical Field

[0001] The invention relates to an auxiliary device for nondestructive testing of existing buildings, and in particular to an auxiliary device for testing an existing external wall external insulation system by using a rebound tester. Background Art

[0002] There are many kinds of external insulation materials and systems, such as insulation boards, insulation mortars, on-site spraying, etc. At present, the quality of external insulation products and construction quality is not well controlled, the product durability is poor, the construction quality control management is difficult, and there are many maintenance problems after the warranty period of the insulation layer. In addition, due to other reasons such as the building structure, climatic conditions, and system materials, accidents such as hollowing, cracking, and falling off of the external wall insulation system often occur. The falling off accident of the external wall insulation system has caused casualties, economic losses, and adverse social impacts. Therefore, it is of great practical significance to test and evaluate the bonding quality and safety of the external wall insulation system, conduct safety rectification, and prevent falling off.

[0003] At present, the overall detection and evaluation technology of external wall insulation system is relatively lacking and has not formed a system. On-site detection mainly uses the "Technical Code for On-site Testing of Energy Saving of Building Envelope Structures" (DG / TJ08-2038-2008) to detect the performance of external wall insulation system, including infrared thermal imaging method to measure thermal defects, core sampling method to test the thickness of insulation layer, etc.

[0004] For the internal damage of the external wall insulation system, infrared thermal imaging and tapping methods are mostly used on site. Among them, infrared thermal imaging is only suitable for the detection of large-scale defects; there is no quantitative standard for the impact strength and judgment criteria of the tapping method, which depends entirely on the experience of the inspectors. In addition, since this method can only detect one point at a time, the detection efficiency is low for large-area external wall insulation systems. Therefore, there is currently no quantitative detection technology for the safety of external wall insulation systems.

[0005] With the continuous occurrence of accidents in external wall insulation systems, there is an urgent need for a rapid and quantitative standard detection method to guide the safety assessment of external wall insulation systems and the subsequent remediation work. This auxiliary device can solve the technical obstacles of multi-point simultaneous detection and significantly improve the detection efficiency. Summary of the invention

[0006] The present invention aims to provide a non-destructive detection auxiliary equipment and detection method for common defects inside existing exterior wall external thermal insulation systems, thereby providing technical support for rapid detection and evaluation of the bonding quality and safety of exterior wall external thermal insulation systems and timely safety rectification.

[0007] The present invention adopts the following technical solutions:

[0008] A method for using a rebound tester to detect auxiliary equipment of an existing external wall external insulation system includes a base plate 1; a plurality of holders 3 are fixed on the front side of the base plate 1, and a connecting component for fixed connection with external equipment is fixedly arranged on the back side; the holder 3 is provided with a group of movable buckles 9 which are limited in the holder 3 and can move relative to the holder 3, and the movable buckle 9 is used to directly clamp the rebound tester; the inner side of a fixed clamp 10 is fixed to the outer side of the movable buckle 9, and the rebound tester is fixed to the holder 3 by the radial clamping force of the clamp.

[0009] Preferably, the holder 3 is in the shape of a plate, and a guide groove is provided inside the holder for the movable buckle 9 to slide.

[0010] Preferably, the opening side of the fixing clamp 10 is clamped and fixed by a rebound tester fixing bolt 11.

[0011] Preferably, a group of parallel slide grooves 4 are fixedly arranged on the base plate 1 along the X direction; a group of slide rails 2 parallel to the Y direction slide along the slide grooves 4; the base 3 slides with the slide rail 2 through the slot 12 at its bottom; a slot fixing screw 13 is passed through the side wall of the slot, and a groove 8 is arranged on the side of the slide rail 2 along the length direction, and the slot fixing screw 13 corresponds to the position of the groove 8.

[0012] Furthermore, a group of screws 5 are provided on the top of the slide rail 2 for fixing the slide rail 2 and the slide groove 4 .

[0013] Preferably, the connecting component comprises a pair of fixed connecting plates 6, and the fixed connecting plates 6 are provided with a plurality of bolt holes 7 for fixed connection with external equipment.

[0014] Furthermore, the external device is a manipulator or a robot.

[0015] Preferably, the inner side of the clamp 10 is fixed to the outer side of the movable buckle 9 by welding.

[0016] The beneficial effects of the present invention are: providing an auxiliary device for detecting an existing external wall thermal insulation system using a rebound tester, which can quickly and quantitatively determine the damage status of the external wall thermal insulation system, improve the detection efficiency and accuracy, and provide a basis for subsequent maintenance of the external wall thermal insulation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the auxiliary equipment structure for using a rebound tester to detect the existing external wall external insulation system.

[0018] Figure 2 This is a schematic diagram of the bottom structure of the auxiliary equipment base plate.

[0019] Figure 3 Schematic diagram of the slide rail structure.

[0020] Figure 4This is a schematic diagram of the upper structure of the card holder.

[0021] Figure 5 This is a schematic diagram of the bottom structure of the card holder.

[0022] Figure 6 To produce a cross-sectional view of a defective EPS board thin-plastered exterior wall insulation system specimen.

[0023] Figure numerals: 1, base plate; 2, slide rail; 3, holder; 4, slide groove on base plate; 5, fixing screws on slide rail; 6, fixing connecting plate on the back of base plate; 7, fixing bolt hole; 8, groove on the side of slide rail; 9, movable buckle; 10, fixing hoop; 11, rebound tester fixing bolt; 12, slot at the bottom of holder; 13, holder fixing screw; A1, base layer, A2, adhesive, A3, EPS board, A4, fiberglass mesh, A5, thin plaster layer, A6, finishing coating. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] See also Figure 1-Figure 6 , a rebound tester is used to detect auxiliary equipment of an existing external wall external insulation system, including a base plate 1; a plurality of holders 3 are fixed on the front side of the base plate 1, and a connecting component for fixed connection with external equipment is fixedly arranged on the back side; the holder 3 is provided with a group of movable buckles 9 which are limited in the holder 3 and can move relative to the holder 3, and the movable buckle 9 is used to directly clamp the rebound tester; the inner side of a fixed clamp 10 is fixed to the outer side of the movable buckle 9, and the rebound tester is fixed on the holder 3 by the radial clamping force of the clamp.

[0026] See also Figure 4-5 The card seat 3 is in the shape of a plate, and a guide groove is provided inside the card seat for the movable card buckle 9 to slide.

[0027] Continue to see Figure 4-5 The opening side of the fixing clamp 10 is clamped and fixed by a rebound tester fixing bolt 11.

[0028] See also Figure 1-5 A group of parallel slide grooves 4 are fixedly arranged on the bottom plate 1 along the X direction; a group of slide rails 2 parallel to the Y direction slide along the slide grooves 4; the card seat 3 slides with the slide rail 2 through the card slot 12 at the bottom thereof; a card slot fixing screw 13 is passed through the side wall of the card slot, and a groove 8 is arranged on the side surface of the slide rail 2 along the length direction, and the card slot fixing screw 13 corresponds to the position of the groove 8.

[0029] See also Figure 1 and Figure 3 A group of screws 5 are provided on the top of the slide rail 2 for fixing the slide rail 2 and the slide groove 4.

[0030] See also Figure 2 The connecting component includes a pair of fixed connecting plates 6, and the fixed connecting plates 6 are provided with a plurality of bolt holes 7 for fixed connection with external equipment.

[0031] In this embodiment, the external device is a manipulator or a robot.

[0032] In this embodiment, see Figure 4 The inner side of the clamp 10 is welded and fixed to the outer side of the movable buckle 9.

[0033] The above-mentioned method for detecting auxiliary equipment of an existing external wall thermal insulation system using a rebound tester comprises the following steps:

[0034] Step S1: Select the area with intact external insulation system as the calibration area. The surface of this area is flat without cracks or repair marks, and the temperature field is evenly distributed in the infrared thermal imaging photo. The area is not less than 100cm 2 And no more than 1m 2 .

[0035] Step S2, collect rebound values ​​at no less than ten different positions in the calibration area, calculate the average value and standard deviation, take the average value minus the standard deviation as the benchmark lower limit, and take the average value plus the standard deviation as the benchmark upper limit; the rebound average value in the calibration area should be 35% to 65% of the rate value of the rebound hammer, otherwise the rebound hammer should be replaced.

[0036] Step S3, arrange the measuring points in the detection area in the horizontal and vertical directions, and the distance between the two measuring points is not less than 5cm and not more than 25cm; move the slide rail 2 along the slide groove 4 on the bottom plate 1, and rotate the screw 5 to fix the slide rail 2 when the distance between the slide rails is equal to the preset vertical distance between the measuring points; clamp the slot 12 of the holder 3 on the groove 8 of the slide rail 2, move the holder 3 until the distance between the holders 3 in the same row is equal to the horizontal distance between the preset points, and rotate the screw 13 to tightly clamp the slot 12 at the bottom of the holder 3 in the groove 8 on the slide rail 2; after all the holders 3 are fixed in the predetermined position, the bottom of the rebound tester can be placed on the holder 3, and the buckle 9 can be moved to make it close to the surrounding of the rebound tester, and finally, the hoop 10 is put around the rebound tester, and the hoop 10 is fixed around the rebound tester with bolts 11, so that the rebound tester is fixed on the holder 3; if there is a loading mechanical equipment such as a wall-climbing robot, the connecting plate 6 and the bolt hole 7 on the back of the bottom plate 1 can be used to connect with other equipment.

[0037] Step S4, using a rebound tester and auxiliary equipment to collect measured rebound values ​​at each measuring point, avoiding the surface damaged area during collection. If the measured value is between the lower limit and the upper limit of the benchmark, it is determined that the external wall insulation system at the measuring point is intact, otherwise it is determined that the external wall insulation system at the measuring point has defects.

[0038] It should be noted that in order to ensure that no secondary damage is caused to the external wall insulation system during the detection process, the nominal kinetic energy and measurement range of the rebound tester are determined according to the material of the external wall insulation system, and the nominal kinetic energy is not greater than 1J.

[0039] The following is a specific test example for illustration:

[0040] Step 1: Make a test piece of EPS board thin plastering exterior wall insulation system with defects:

[0041] See also Figure 6 , test piece conditions: ① The base wall adopts C30 concrete shear wall A1, with a thickness of 200mm, a width and a height of 2150mm and 1800mm respectively; ② The adhesive A2 adopts polymer mortar, and the thickness specification is not specified, and it is implemented according to the conventional process requirements); ③ 50mm thick EPS board A3; ④ Glass fiber mesh A4 (unit area mass ≥130g / m2); ⑤ Thin plastering layer A5, 3mm-7mm thick polymer mortar (glass fiber mesh 4 is located in the thin plastering layer 5); ⑥ The finishing coating A6 adopts commonly used M5 or M10 plastering mortar, and the thickness is implemented according to the conventional process requirements; ⑦ The preset defect is between the outermost insulation layer and the finishing coating A6, and the method is to lay floating soil, arrange plastic paper or preset voids.

[0042] Step 2: Collect the rebound value of the intact area of ​​the EPS board thin plaster specimen to determine the reference range:

[0043] The rebound value was collected by a brick rebound tester with a calibrated kinetic energy of 0.7 J and a measuring range of 6 to 30 MPa. The calibration value of the rebound tester was 74. A 350×500 mm area was selected as the calibration area in the intact area of ​​the specimen surface. Rebound values ​​were collected at any 30 locations in the calibration area. The average value was 32.5, which was 43.9% of the calibration value, and the standard deviation was 2.7.

[0044] Step 3: Set the distance between the test points in the test area, arrange the holder on the auxiliary equipment and install the rebound tester, collect the rebound value and judge the integrity of the test points:

[0045] According to the mean and standard deviation of the rebound measured in the intact area, the lower limit of the benchmark is determined to be 29.8 and the upper limit of the benchmark is 35.2. When the test rebound value is between the upper and lower limits, the point is judged to be intact; otherwise, it is judged that there are defects in the external wall insulation system.

[0046] The above are preferred embodiments of the present invention. A person skilled in the art may make various changes or improvements on this basis. Without departing from the general concept of the present invention, these changes or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A method for detecting auxiliary equipment of an existing external wall external insulation system using a rebound tester, characterized in that: It comprises a base plate (1); a plurality of card holders (3) are fixed on the front side of the base plate (1), and a connecting component for fixedly connecting with an external device is fixedly arranged on the back side; The holder (3) is provided with a group of movable buckles (9) which are limited in the holder (3) and can move relative to the holder (3), and the movable buckles (9) are used to directly clamp the rebound tester; The inner side of the fixed clamp (10) is fixed to the outer side of the movable buckle (9), and the rebound tester is fixed on the clamping seat (3) through the radial clamping force of the clamp; The card seat (3) is in the shape of a plate, and is provided with a guide groove inside for the movable card buckle (9) to slide; The open side of the fixing clamp (10) is clamped and fixed by a rebound hammer fixing bolt (11); A group of parallel sliding grooves (4) are fixedly arranged on the bottom plate (1) along the X direction; A set of slide rails (2) parallel to the Y direction slide along the slide groove (4); The holder (3) is slidably matched with the slide rail (2) via a slot (12) at the bottom thereof; a slot fixing screw (13) is provided on the side wall of the slot, and a groove (8) is provided on the side of the slide rail (2) along the length direction, and the slot fixing screw (13) corresponds to the position of the groove (8); A set of screws (5) is provided on the top of the slide rail (2) for fixing the slide rail (2) and the slide groove (4); The connecting component comprises a pair of fixed connecting plates (6), and the fixed connecting plates (6) are provided with a plurality of bolt holes (7) for fixed connection with external equipment; The detection method includes the following steps: Step S1: Select the area with intact external insulation system as the calibration area. The surface of this area is flat without cracks or repair marks, and the temperature field is evenly distributed in the infrared thermal imaging photo. The area is not less than 100cm 2 And no more than 1m 2 ; Step S2, collect rebound values ​​at no less than ten different positions in the calibration area, calculate the average value and standard deviation, take the average value minus the standard deviation as the lower limit of the benchmark, and take the average value plus the standard deviation as the upper limit of the benchmark; the rebound average value in the calibration area should be 35% to 65% of the rate value of the rebound hammer, otherwise the rebound hammer should be replaced; Step S3, arrange the measuring points in the detection area in both horizontal and vertical directions, and the distance between the two measuring points is not less than 5cm and not more than 25cm; move the slide rail along the slide groove on the bottom plate, and when the distance between the slide rails is equal to the preset vertical distance between the measuring points, rotate the screw to fix the slide rail; clamp the slot of the holder on the groove of the slide rail, move the holder until the distance between the holders in the same row is equal to the horizontal distance between the preset points, and rotate the screw to tightly clamp the slot at the bottom of the holder in the groove on the slide rail; after all the holders are fixed in the predetermined position, the bottom of the rebound tester can be placed on the holder, and the buckle can be moved to make it close to the surrounding of the rebound tester, and finally, a hoop can be put around the rebound tester, and the hoop can be fixed around the rebound tester with bolts, so that the rebound tester is fixed on the holder; if there is a loading mechanical equipment such as a wall-climbing robot, the connecting plate and bolt holes on the back of the bottom plate can be used to connect with other equipment; Step S4, using a rebound tester and auxiliary equipment to collect measured rebound values ​​at each measuring point, avoiding the surface damaged area during collection. If the measured value is between the lower limit and the upper limit of the benchmark, it is determined that the external wall insulation system at the measuring point is intact, otherwise it is determined that the external wall insulation system at the measuring point has defects.

2. The detection method for detecting auxiliary equipment of an existing external wall external insulation system using a rebound tester as claimed in claim 1, characterized in that: The external device is a manipulator or a robot.

3. The method for detecting auxiliary equipment of an existing external wall external insulation system using a rebound tester as claimed in claim 1, characterized in that: The inner side of the clamp (10) is welded and fixed to the outer side of the movable buckle (9).

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