CN113447370B - Integral tensile and shear test system and method for precast concrete sandwich heat-insulating wallboard - Google Patents
Integral tensile and shear test system and method for precast concrete sandwich heat-insulating wallboard Download PDFInfo
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- CN113447370B CN113447370B CN202110702569.2A CN202110702569A CN113447370B CN 113447370 B CN113447370 B CN 113447370B CN 202110702569 A CN202110702569 A CN 202110702569A CN 113447370 B CN113447370 B CN 113447370B
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a system and a method for testing the whole tensile shear of a precast concrete sandwich heat-insulating wallboard. The test system comprises a horizontal shearing device, an axial tension device and a pier support; the axial tension device comprises a vertical actuator, a sliding rail fixture cover plate and a slidable fixture, and two ends of the slidable fixture clamp an outer leaf wallboard; the horizontal shearing device comprises a horizontal actuator and a side end clamp, and one side of the side end clamp clamps the side edge of the outer leaf wallboard. According to the invention, the sliding clamp and the side end clamp are respectively arranged in the axial tension and horizontal shearing directions, when the upper part of the outer leaf wallboard is tensioned, the sliding clamp can drive the sliding rail clamp cover plate to move, so that the tension of the upper vertical actuator is always upward; when the outer leaf wallboard is displaced upwards, the horizontal actuators on the side edges can be ensured to be always horizontal; the test system of the invention is adopted to carry out the tensile-shear test on the whole wallboard, thereby eliminating the serious quality potential safety hazard of building components and having better social effect.
Description
Technical Field
The invention relates to the field of buildings, in particular to a system and a method for testing the whole tensile shear of a precast concrete sandwich heat-insulating wallboard.
Background
The prefabricated concrete sandwich heat-insulating external wall panel consists of an inner concrete plate, an outer concrete plate She Yuzhi, a heat-insulating layer and a connecting piece penetrating through the heat-insulating layer to connect the inner leaf plate and the outer leaf plate, and is a novel heat-insulating external wall system integrating bearing, heat insulation and decoration. In the wall, the heat preservation layer is arranged between two layers of precast concrete boards, so that the durability and fire resistance of the heat preservation system are obviously improved, the same service life of the heat preservation system and a main structure is realized, and the total life cycle cost of a building is reduced.
In engineering practice, the precast concrete sandwich heat-insulating wall is often used as an outer wall of a building to bear dead weight, wind load, earthquake load and the like. Under complex stress conditions, if the sandwich insulation wall body has defects in the design or construction process, the failure of the connecting piece occurs in the use process, and the integrity of the wallboard is reduced. When serious, the outer leaf wallboard can also fall off, immeasurable serious consequences can be caused, and huge engineering hidden trouble is generated.
Research shows that the pulling-out and shearing bearing capacity of the connecting piece is a key property affecting the mechanical property of the wall body. At present, related test methods for the pulling-out bearing capacity, shearing bearing capacity and the like of the drawknot piece exist. For example, JC/T2504-2019 of prefabricated concrete sandwich heat-insulating wallboard of prefabricated building adopts a double-side shearing test method and a single-side shearing test method to measure the shearing bearing capacity of the FRP connecting piece in concrete; and measuring the pulling-resistant bearing capacity of the FRP connecting piece in concrete by adopting a double-side anchoring pulling-out test and a single-side anchoring pulling-out test.
However, in the above test method, a single or two drawknot members and a local wallboard simulation member are used as test objects, and the reduction of the actual bearing capacity of the wallboard in the composite stress state is not considered. The wallboard applied in practical engineering contains 10-20 or more drawknot members, the wallboard production process is different, the anchoring effect on the drawknot members is different, and the simulated small test piece cannot represent or test the tensile, shearing or tensile-shearing bearing capacity of the whole wallboard at all.
In practical engineering application, the construction process of the whole wallboard is greatly different from that of a local wallboard simulation part, the quality control difficulty is more difficult, some quality hidden dangers often exist, and the whole quality cannot reach the ideal state of the simulation part or design. In the past test research center, more serious quality hidden dangers are found, and once the test research center is applied to engineering, the results are not considered. In engineering application, the wallboard is more complicated in internal stress under the action of dead weight, wind load or earthquake. Therefore, in order to verify the structural safety of the wallboard in engineering practical application, safety accidents and social adverse effects are avoided, and the whole performance test of the precast concrete sandwich heat-insulating external wallboard is very necessary to be carried out.
The patent CN109187229a provides a stud pull shear test device, which mainly performs a shear test study on a stud in concrete under a tensile stress state. The device has compact structure, convenient operation, high accuracy, reasonable stress, strong accuracy and the like. The patent is only a pull-shear test of a small peg, and cannot carry out the pull-shear test on the precast concrete sandwich heat preservation strong book.
The frozen soil tensile shear tester disclosed in the patent CN112525723A provides a low-temperature environment through a low-temperature test cover, can complete tensile and shear tests in a smaller operation space, can accurately simulate the mechanical behavior of the contact surface of frozen soil and a structure, and mainly aims to measure the shear test of the shear strength of the interface area of the frozen soil and the structure.
In conclusion, the prior art lacks a device for the whole tensile shear test of the wallboard, which is not beneficial to quality control, inspection and production research and development; and the existing structural performance loading counterforce device can not meet the requirements of wallboard tensile shear tests.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a prefabricated concrete sandwich heat-insulating wallboard integral tensile shear test system, which designs a special stress tool by means of the existing structural performance loading counterforce device so as to meet test requirements.
The invention provides a prefabricated concrete sandwich heat-insulating wallboard integral tensile shear test system which comprises a horizontal shearing device, an axial tension device and a pier support;
the prefabricated concrete sandwich heat-insulating wallboard comprises a concrete outer-leaf wallboard, a concrete inner-leaf wallboard, a sandwich heat-insulating material between the two, and a drawknot piece which passes through the heat-insulating material and is connected with the inner-leaf wallboard and the outer-leaf wallboard;
the axial tension device comprises a vertical actuator, a sliding rail clamp cover plate and two sliding clamps, wherein the upper part of the sliding rail clamp cover plate is provided with an end plate, the end plate is connected with the vertical actuator, the sliding rail clamp cover plate is mainly connected with the vertical actuator through the end plate by adopting a screw rod, the lower part of the sliding rail clamp cover plate is matched with the two sliding clamps in a symmetrical state to form sliding connection, and the sliding clamps are arranged on a concrete outer leaf wallboard, and the two ends of the sliding clamps clamp the concrete outer leaf wallboard; the upper part of the concrete outer leaf wallboard is pulled, the sliding clamp is used for clamping the outer leaf wallboard, the position of the actuator is fixed, when the outer leaf wallboard horizontally moves sideways, the sliding clamp can drive the sliding rail clamp cover plate to move, so that the tension of the upper vertical actuator is always upward, no oblique additional tension is generated, and if no sliding rail exists, the upward tension can be inclined;
the horizontal shearing device comprises a horizontal actuator and a side end clamp, one side of the side end clamp, which is provided with a clamping groove, is arranged between the two sliding clamps and clamps the side edge of the concrete outer leaf wallboard, and the other side of the side end clamp is connected with the horizontal actuator; the side edge of the concrete outer leaf wallboard is clamped by a side end clamp, and when the outer leaf wallboard is displaced upwards, the horizontal actuator of the side edge can be ensured to be always horizontal and along the center of the outer leaf wallboard;
the pier support is provided with 4 pier supports, the tops of the pier supports are L-shaped, and the four corners of the concrete inner leaf wallboard are respectively clamped, so that the concrete inner leaf wallboard is fixed, and the bottoms of the pier supports are anchored on a channel of the channel terrace through anchor bolts.
The pier support top L-shaped notch department is equipped with fixed connection and forms horizontal fixed plate and the perpendicular fixed plate of type of falling L, and perpendicular fixed plate and pier support upper portion grooved perpendicular department fixed connection, and the horizontal fixed plate is arranged in on the concrete inner leaf wallboard, adopts horizontal fixed plate and perpendicular fixed plate to clip the concrete inner leaf wallboard simultaneously, and 4 supports of horizontal, perpendicular dead inner leaf wallboard of fixed lock are anchored on the channel terrace with the crab-bolt.
The L-shaped notch at the top of the pier support is horizontally provided with a cushion block, a concrete inner leaf wallboard can be placed on the cushion block, and when the thickness of the precast concrete sandwich heat-insulating wallboard is smaller, the cushion block is adopted to clamp the concrete inner leaf wallboard, so that the side displacement of the concrete inner leaf wallboard is avoided; the cushion block is a cushion block steel plate or a rubber cushion block.
The invention also provides a test method adopting the whole tensile shear test system for the precast concrete sandwich heat-insulating wallboard, which comprises the following specific steps:
(1) According to the plane size of the prefabricated concrete sandwich heat-insulating wallboard to be tested and the height of the pier support, the positions of the vertical actuator and the horizontal actuator are adjusted and fixed;
(2) Placing the sandwich heat-insulating wallboard in the step (1) horizontally, placing a concrete inner leaf wallboard downwards and a concrete outer leaf wallboard upwards, placing the inner leaf wallboard at the tops of the four buttress seats, and enabling the end parts of the inner leaf wallboard to extend into L-shaped bayonets at the tops of the buttress seats; the plane positions of the pier seats are adjusted one by one, and meanwhile, cushion block steel plates or rubber gaskets are plugged into the positions of the bayonets of the pier seats, so that the pier seats completely clamp the inner leaf parts of the wallboards;
(3) After the positions of the four abutment seats are regulated, the anchor bolts at the bottoms of the abutment seats are screwed down to be fully anchored on the channel terrace, so that the abutment seats and the inner leaf parts of the wallboard are fully fixed horizontally and vertically;
(4) The upper part of the concrete outer leaf wallboard is provided with a slidable clamp and a slide rail clamp cover plate, and the slide rail clamp cover plate is connected with an upper vertical actuator through an end plate by adopting a screw;
(5) A side end clamp is arranged at the side end of the concrete outer leaf wallboard and is connected with a horizontal actuator;
(6) Initializing displacement and force values of a horizontal actuator and a vertical actuator in an electrohydraulic servo system; preloading is carried out, so that the test loading system and the measurement system are ensured to be installed correctly;
(7) In the formal test, a constant horizontal pushing force is applied to the concrete outer-leaf wallboard through the horizontal actuator, and then the upper pulling force is applied step by step through the vertical actuator, so that the pulling force can be ensured to be always vertically upwards due to the action of the chute clamp; the constant vertical tension is applied to the concrete outer leaf wallboard through the vertical actuator, then the horizontal thrust is gradually applied through the horizontal actuator, and as the side end clamps are in spherical contact, the horizontal thrust can be ensured to be always along the outer leaf of the wallboard, and the horizontal in-plane is kept, so that the pull-shear bearing capacity of the wallboard is verified; and during exploratory tests, horizontal pushing force and vertical pulling force are applied step by step and synchronously, and the pulling and shearing performance of the wallboard is researched.
When the sandwich heat-insulating wallboard is in a flat-laying test, the horizontal force is loaded on the outer leaf wallboard to cause lateral displacement, and the tensile force is inclined and cannot always vertically upwards; also, the upward displacement of the outer leaf wall plate can be caused when the outer leaf wall plate is pulled upwards, and the lateral horizontal thrust cannot be kept horizontal at the moment, so that coordination is difficult. The tensile shear test system has the following beneficial effects:
(1) According to the invention, the sliding clamp and the sliding rail clamp cover plate are arranged in the axial tension direction and are connected with the vertical actuator, when the upper part of the concrete outer leaf wallboard is tensioned and horizontally moved, the sliding rail clamp cover plate can be driven to move by the sliding clamp, so that the tension of the vertical actuator at the upper part is always upward, and no oblique additional tension is generated;
(2) According to the invention, the side end clamps are arranged in the horizontal shearing direction, the side end clamps are used for clamping the side edges of the concrete outer leaf wallboard, and when the outer leaf wallboard is displaced upwards, the horizontal actuators on the side edges can be ensured to be always horizontal and along the center of the outer leaf wallboard;
(3) The anchor bolts are adopted to anchor the bottom of the pier support to the channel of the channel terrace, so that the wallboard is indirectly fixed and prevented from moving;
(4) The pull shear test system can realize the whole pull shear test of the precast concrete sandwich heat-insulating wallboard, solve the technical bottleneck at the present stage, realize the whole pull shear test and fill the blank of the industry;
(5) Through technical innovation, the invention is beneficial to the development of wallboard products and promotes the technical development of green buildings and assembled buildings;
(6) The whole wallboard is subjected to a tensile shear test by adopting the test system, so that important quality safety hidden trouble of building components is eliminated, and a better social effect is achieved;
(7) And a certain economic benefit is realized for the inspection and detection unit.
Drawings
Fig. 1 is a schematic diagram of the whole tensile-shear test system and the whole structure of a sandwich heat-insulating wallboard of the precast concrete sandwich heat-insulating wallboard.
Fig. 2 is a front view of the prefabricated concrete sandwich heat-insulating wallboard.
Fig. 3 is a side view of the prefabricated concrete sandwich insulation wallboard of the present invention.
Fig. 4 is an overall top view of the slidable clamp, side end clamp and concrete outer leaf wall panel of the present invention.
Fig. 5 is a schematic structural diagram of the side end clamp and the prefabricated concrete sandwich heat-insulating wallboard.
Fig. 6 is a schematic diagram of the connection of the cover plate, the end plate and the screw of the slide rail clamp.
Fig. 7 is a schematic connection diagram of the slide rail clamp cover plate, the end plate, the screw and the slidable clamp according to the present invention.
Fig. 8 is a side view of the connection of the slidable clamp and the concrete outer leaf wall panel of the present invention.
Fig. 9 is a schematic view of a part of the prefabricated concrete sandwich insulation wallboard, the pier support and the channel terrace.
Each labeled in fig. 1-9: the concrete-filled heat-insulating wall plate comprises a vertical actuator, a horizontal actuator, a 3 precast concrete filled heat-insulating wall plate, a 3-1 concrete outer leaf wall plate, a 3-2 filled heat-insulating material, a 3-3 concrete inner leaf wall plate, a 3-4 drawknot piece, a 4 sliding rail clamp cover plate, a 5 end plate, a 6 slidable clamp, a 7-side end clamp, an 8 pier support, a 9 horizontal fixing plate, a 10 vertical fixing plate, an 11 cushion block, a 12 anchor bolt, a 13 channel terrace and 14 screws.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The invention provides a prefabricated concrete sandwich heat-insulating wallboard integral tensile shear test system which comprises a horizontal shearing device, an axial tension device and a pier support 8;
the prefabricated concrete sandwich heat-insulating wallboard 3 comprises a concrete outer-leaf wallboard 3-1, a concrete inner-leaf wallboard 3-3, a sandwich heat-insulating material 3-2 between the two, and a drawknot piece 3-4 which passes through the heat-insulating material and is connected with the inner-leaf wallboard and the outer-leaf wallboard;
the axial tension device comprises a vertical actuator 1, a sliding rail clamp cover plate 4 and two sliding clamps 6, wherein an end plate 5 is arranged at the upper part of the sliding rail clamp cover plate 4, the sliding rail clamp cover plate 4 is connected with the vertical actuator 1 through the end plate 5 by adopting a screw 14, the lower part of the sliding rail clamp cover plate is matched with the two sliding clamps 6 in a symmetrical state to form sliding connection, the sliding clamps 6 are arranged on a concrete outer leaf wallboard 3-1, and the two ends of the sliding clamps clamp the concrete outer leaf wallboard 3-1; the upper part of the concrete outer leaf wallboard 3-1 is pulled, the slidable clamp 6 is used for clamping the outer leaf wallboard, the position of the actuator is fixed, when the outer leaf wallboard horizontally moves sideways, the sliding rail clamp cover plate 4 can be driven to move by the slidable clamp 6, so that the tensile force of the upper vertical actuator 1 is always upward, no oblique additional tensile force is generated, and if no sliding rail exists, the upward tensile force can be inclined;
the horizontal shearing device comprises a horizontal actuator 2 and a side end clamp 7, wherein one side of the side end clamp 7 provided with a clamping groove is arranged between two slidable clamps 6 and clamps the side edge of the concrete outer leaf wallboard 3-1, and the other side of the side end clamp is connected with the horizontal actuator 2; the side edge of the concrete outer leaf wallboard 3-1 is clamped by a side end clamp 7, and when the outer leaf wallboard is displaced upwards, the horizontal actuator 2 on the side edge can be ensured to be always horizontal and along the center of the outer leaf wallboard;
the pier supports 8 are provided with 4 pier supports, the tops of the pier supports are L-shaped, and the four corners of the concrete inner leaf wallboard 3-3 are respectively clamped, so that the concrete inner leaf wallboard 3-3 is fixed, and the bottoms of the pier supports 8 are anchored on a channel of the channel terrace 13 through anchor bolts 12.
The L-shaped notch at the top of the pier support 8 is provided with a horizontal fixing plate 9 and a vertical fixing plate 10 which are fixedly connected to form an inverted L shape, the vertical fixing plate 10 is fixedly connected with the vertical position of the upper portion of the pier support 8, the horizontal fixing plate 9 is arranged on the concrete inner leaf wallboard 3-3, meanwhile, the horizontal fixing plate 9 and the vertical fixing plate 10 are adopted to clamp the concrete inner leaf wallboard 3-3, 4 supports for locking the inner leaf wallboard are fixed horizontally and vertically, and the supports are anchored on the channel terrace 13 by anchor bolts 12.
The L-shaped notch at the top of the pier support 8 is horizontally provided with a cushion block 11, the concrete inner-leaf wallboard 3-3 is arranged on the cushion block 11, and when the thickness of the precast concrete sandwich heat-insulating wallboard 3 is smaller, the cushion block 11 is adopted to clamp the concrete inner-leaf wallboard 3-3 so as to avoid lateral movement; the cushion block 11 is a cushion block steel plate or a rubber cushion block.
The tensile and shearing test is carried out on the whole precast concrete sandwich heat-insulating wallboard by adopting the test system, and the concrete test steps are as follows:
(1) According to the plane size of the prefabricated concrete sandwich heat-insulating wallboard to be tested and the height of the pier support, the positions of the vertical actuator and the horizontal actuator are adjusted and fixed;
(2) Placing the sandwich heat-insulating wallboard in the step (1) horizontally, placing a concrete inner leaf wallboard downwards and a concrete outer leaf wallboard upwards, placing the inner leaf wallboard at the tops of the four buttress seats, and enabling the end parts of the inner leaf wallboard to extend into L-shaped bayonets at the tops of the buttress seats; the plane positions of the pier seats are adjusted one by one, and meanwhile, cushion block steel plates or rubber gaskets are plugged into the positions of the bayonets of the pier seats, so that the pier seats completely clamp the inner leaf parts of the wallboards;
(3) After the positions of the four abutment seats are regulated, the anchor bolts at the bottoms of the abutment seats are screwed down to be fully anchored on the channel terrace, so that the abutment seats and the inner leaf parts of the wallboard are fully fixed horizontally and vertically;
(4) The upper part of the concrete outer leaf wallboard is provided with a slidable clamp and a slide rail clamp cover plate, and the slide rail clamp cover plate is connected with an upper vertical actuator through an end plate by adopting a screw;
(5) A side end clamp is arranged at the side end of the concrete outer leaf wallboard and is connected with a horizontal actuator;
(6) Initializing displacement and force values of a horizontal actuator and a vertical actuator in an electrohydraulic servo system; preloading is carried out, so that the test loading system and the measurement system are ensured to be installed correctly;
(7) In the formal test, a constant horizontal pushing force is applied to the concrete outer-leaf wallboard through the horizontal actuator, and then the upper pulling force is applied step by step through the vertical actuator, so that the pulling force can be ensured to be always vertically upwards due to the action of the chute clamp; the constant vertical tension is applied to the concrete outer leaf wallboard through the vertical actuator, then the horizontal thrust is gradually applied through the horizontal actuator, and as the side end clamps are in spherical contact, the horizontal thrust can be ensured to be always along the outer leaf of the wallboard, and the horizontal in-plane is kept, so that the pull-shear bearing capacity of the wallboard is verified; and during exploratory tests, horizontal pushing force and vertical pulling force are applied step by step and synchronously, and the pulling and shearing performance of the wallboard is researched.
When the sandwich heat-insulating wallboard is in a flat-laying test, the horizontal force is loaded on the outer leaf wallboard to cause lateral displacement, and the tensile force is inclined and cannot always vertically upwards; also, the upward displacement of the outer leaf wall plate can be caused when the outer leaf wall plate is pulled upwards, and the lateral horizontal thrust cannot be kept horizontal at the moment, so that coordination is difficult. The invention can realize the whole tensile-shear test of the precast concrete sandwich heat-insulating wallboard by adopting the tensile-shear test system, fills the blank of the industry, and can eliminate important quality and safety hidden trouble of building components.
Claims (7)
1. A whole tensile shear test system of precast concrete sandwich heat preservation wallboard, its characterized in that: comprises a horizontal shearing device, an axial tension device and a pier support (8);
the prefabricated concrete sandwich heat-insulating wallboard (3) comprises a concrete outer-leaf wallboard (3-1), a concrete inner-leaf wallboard (3-3), a sandwich heat-insulating material (3-2) between the two, and a drawknot piece (3-4) which penetrates through the heat-insulating material and is connected with the inner-leaf wallboard and the outer-leaf wallboard;
the axial tension device comprises a vertical actuator (1), a sliding rail clamp cover plate (4) and two sliding clamps (6); an end plate (5) is arranged at the upper part of the slide rail clamp cover plate (4), and the end plate (5) is connected with the vertical actuator (1); the lower part of the sliding rail clamp cover plate (4) is matched with two sliding clamps (6) in a symmetrical state to form sliding connection, the sliding clamps (6) are arranged on the concrete outer leaf wallboard (3-1) and the two ends of the sliding clamps clamp the concrete outer leaf wallboard (3-1);
the horizontal shearing device comprises a horizontal actuator (2) and a side end clamp (7), wherein one side of the side end clamp (7) provided with a clamping groove is arranged between two slidable clamps (6) and clamps the side edge of the concrete outer leaf wallboard (3-1), and the other side of the side end clamp is connected with the horizontal actuator (2);
the pier supports (8) are provided with 4 pier supports, the tops of the pier supports are L-shaped, and the pier supports are used for clamping four corners of the concrete inner leaf wallboard (3-3) respectively.
2. The system for testing the whole tensile shear of the precast concrete sandwich heat-insulating wallboard according to claim 1, wherein the end plate (5) on the slide rail clamp cover plate (4) is connected with the vertical actuator (1) by adopting a screw (14).
3. The system for integrally pulling and shearing the prefabricated concrete sandwich heat-insulating wallboard according to claim 1, wherein an inverted L-shaped horizontal fixing plate (9) and a vertical fixing plate (10) are fixedly connected at an L-shaped notch at the top of the pier support (8), the vertical fixing plate (10) is fixedly connected with a vertical position of a notch at the upper part of the pier support (8), the horizontal fixing plate (9) is arranged on the concrete inner leaf wallboard (3-3), and the concrete inner leaf wallboard (3-3) is clamped by adopting the horizontal fixing plate (9) and the vertical fixing plate (10).
4. The system for testing the integral tensile and shear of the precast concrete sandwich heat-insulating wallboard according to claim 1, wherein the bottom of the pier support (8) is anchored on a channel of the channel terrace (13) through an anchor bolt (12).
5. The system for testing the whole tensile shear of the precast concrete sandwich heat-insulating wallboard according to claim 1, wherein a cushion block (11) is horizontally arranged at the L-shaped notch at the top of the pier support (8).
6. The system for testing the whole tensile shear of the precast concrete sandwich heat-insulating wallboard according to claim 5, wherein the cushion block (11) is a cushion block steel plate or a rubber cushion block.
7. A test method adopting the prefabricated concrete sandwich heat-insulating wallboard integral tensile-shear test system as claimed in any one of claims 1 to 6, which is characterized by comprising the following specific steps:
(1) According to the plane size of the prefabricated concrete sandwich heat-insulating wallboard to be tested and the height of the pier support, the positions of the vertical actuator and the horizontal actuator are adjusted and fixed;
(2) Placing the sandwich heat-insulating wallboard in the step (1) horizontally, placing a concrete inner leaf wallboard downwards and a concrete outer leaf wallboard upwards, placing the inner leaf wallboard at the tops of the four buttress seats, and enabling the end parts of the inner leaf wallboard to extend into L-shaped bayonets at the tops of the buttress seats; the plane positions of the pier seats are adjusted one by one, and meanwhile, cushion block steel plates or rubber gaskets are plugged into the positions of the bayonets of the pier seats, so that the pier seats completely clamp the inner leaf parts of the wallboards;
(3) After the positions of the four abutment seats are regulated, the anchor bolts at the bottoms of the abutment seats are screwed down to be fully anchored on the channel terrace, so that the abutment seats and the inner leaf parts of the wallboard are fully fixed horizontally and vertically;
(4) The upper part of the concrete outer leaf wallboard is provided with a slidable clamp and a sliding rail clamp cover plate, and the sliding rail clamp cover plate can be connected with an upper vertical actuator through an end plate by adopting a screw;
(5) A side end clamp is arranged at the side end of the concrete outer leaf wallboard and is connected with a horizontal actuator;
(6) Initializing displacement and force values of a horizontal actuator and a vertical actuator in an electrohydraulic servo system; preloading is carried out, so that the test loading system and the measurement system are ensured to be installed correctly;
(7) In the formal test, a constant horizontal pushing force is applied to the concrete outer-leaf wallboard through the horizontal actuator, and then the upper pulling force is applied step by step through the vertical actuator, so that the pulling force can be ensured to be always vertically upwards due to the action of the chute clamp; the constant vertical tension is applied to the concrete outer leaf wallboard through the vertical actuator, then the horizontal thrust is gradually applied through the horizontal actuator, and as the side end clamps are in spherical contact, the horizontal thrust can be ensured to be always along the outer leaf of the wallboard, and the horizontal in-plane is kept, so that the pull-shear bearing capacity of the wallboard is verified; and during exploratory tests, horizontal pushing force and vertical pulling force are applied step by step and synchronously, and the pulling and shearing performance of the wallboard is researched.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110702569.2A CN113447370B (en) | 2021-06-24 | 2021-06-24 | Integral tensile and shear test system and method for precast concrete sandwich heat-insulating wallboard |
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| CN202110702569.2A CN113447370B (en) | 2021-06-24 | 2021-06-24 | Integral tensile and shear test system and method for precast concrete sandwich heat-insulating wallboard |
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| CN113447370A CN113447370A (en) | 2021-09-28 |
| CN113447370B true CN113447370B (en) | 2023-05-30 |
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