CN113447370A - Integral tension-shear test system and method for precast concrete sandwich thermal insulation wallboard - Google Patents
Integral tension-shear test system and method for precast concrete sandwich thermal insulation wallboard Download PDFInfo
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- CN113447370A CN113447370A CN202110702569.2A CN202110702569A CN113447370A CN 113447370 A CN113447370 A CN 113447370A CN 202110702569 A CN202110702569 A CN 202110702569A CN 113447370 A CN113447370 A CN 113447370A
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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
- 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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- G01N3/04—Chucks
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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
- 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
- G01—MEASURING; TESTING
- 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
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention discloses an integral pulling and shearing test system and method for a precast concrete sandwich thermal insulation 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 slide rail clamp cover plate and a slidable clamp, and the two ends of the slidable clamp the outer leaf wallboard; the horizontal shearing device comprises a horizontal actuator and a side end clamp, wherein one side of the side end clamp clamps the side edge of the outer leaf wallboard. The slidable fixture and the side end fixture are respectively arranged in the axial tension direction and the horizontal shearing direction, when the upper part of the outer leaf wallboard is tensioned, the slidable fixture can drive the sliding rail fixture cover plate to move, and the tension of the upper vertical actuator is ensured to be always upward; when the outer leaf wallboard moves upwards, the horizontal actuator on the side edge 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 potential quality safety hazard of the building member and having better social effect.
Description
Technical Field
The invention relates to the field of buildings, in particular to a whole tension-shear test system and method for a precast concrete sandwich thermal insulation wallboard.
Background
The precast concrete sandwich thermal insulation external wall panel consists of an inner leaf precast concrete plate, an outer leaf precast concrete plate, a thermal insulation layer and a connecting piece which penetrates through the thermal insulation layer and is connected with the inner leaf plate and the outer leaf plate, and is a novel thermal insulation external wall system which integrates bearing, thermal insulation and decoration. In the wall body, the heat insulation layer is arranged between two layers of precast concrete plates, so that the durability and the fire resistance of the heat insulation system are obviously improved, the same service life of the heat insulation system and a main structure is realized, and the whole life cycle cost of a building is reduced.
In engineering practice, the precast concrete sandwich thermal insulation wall is often used as an outer wall of a building to bear dead weight, wind load, earthquake load and the like. Under the complex stress condition, if the sandwich thermal insulation wall has defects in the design or construction process, the connecting piece fails in the use process, and the integrity of the wallboard is reduced. In severe cases, the outer leaf wallboard can fall off, inestimable serious consequences can be caused, and huge engineering hidden dangers are produced.
Researches show that the pulling-out and shearing bearing capacity of the connecting piece is the key performance influencing the mechanical property of the wall body. At present, related test methods are available for the pull-out bearing capacity, the shear bearing capacity and the like of a pulling piece. For example, the shear bearing capacity of the FRP connecting piece in concrete is measured by adopting a bilateral shear test method and a unilateral shear test method in JC/T2504-containing 2019 of prefabricated concrete sandwich thermal insulation wallboard for prefabricated buildings; and (3) adopting a double-side anchoring pull-out test and a single-side anchoring pull-out test to measure the pulling-out bearing capacity and the like of the FRP connecting piece in the concrete.
However, in the above test methods, a single or two tie pieces and a local wallboard simulation piece are used as test objects, and the reduction of the actual bearing capacity of the wallboard in a composite stress state is not considered. The wallboard that actual engineering was used contains 10 ~ 20 even more drawknot pieces, and the wallboard production technology is different, and is also inconsistent to the anchor effect of drawknot piece, and the simulation small test piece can not represent at all and also can not inspect tensile, shear or draw and cut the bearing capacity of whole wallboard.
In practical engineering application, the difference between the whole construction process of the wallboard and the local wallboard simulation part construction process is large, the quality control difficulty is difficult, some quality hidden dangers often exist, and the whole quality cannot reach the ideal state of the simulation part or the design. In the past experimental research center, more serious quality hidden dangers are found, and once the method is applied to engineering, the consequences are not imaginable. In engineering application, the wallboard is acted under the action of dead weight, wind load or earthquake, and the internal stress is more complex. Therefore, in order to verify the structural safety of the wallboard in the practical engineering application and avoid causing safety accidents and social adverse effects, it is necessary to develop the overall performance test of the precast concrete sandwich thermal insulation external wallboard.
The stud pulling and shearing test device provided by the patent CN109187229A is mainly used for carrying out shearing test research on studs in concrete in a tensile stress state. The device has the characteristics of compact structure, convenient operation, high precision, reasonable stress, strong accuracy and the like. The patent is only a pull-shear test of a small stud, and cannot carry out the pull-shear test on the strength of the precast concrete sandwich insulation.
The frozen soil tensile shear tester disclosed in patent CN112525723A provides a low temperature environment through a low temperature test cover, can complete tensile and shear tests in a small operation space, can accurately simulate the mechanical behavior of the contact surface of frozen soil and a structure, and mainly aims at measuring the shear test of the shear strength of the frozen soil-structure interface region.
In conclusion, the existing device for the integral pulling and shearing test of the wallboard is not available, and quality control, inspection and production research and development are not facilitated; and the existing structural performance loading counterforce device can not meet the requirements of the wallboard pulling and shearing test.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an integral pulling and shearing test system for a precast concrete sandwich thermal insulation wallboard, which is characterized in that a special stress tool is designed by means of the existing structural performance loading counterforce device so as to meet the test requirements.
The invention provides an integral pulling and shearing test system for a precast concrete sandwich thermal insulation wallboard, which comprises a horizontal shearing device, an axial tension device and a pier support;
the prefabricated concrete sandwich heat-insulation wallboard comprises a concrete outer leaf wallboard, a concrete inner leaf wallboard, a sandwich heat-insulation material between the concrete outer leaf wallboard and the concrete inner leaf wallboard, and a pulling piece which penetrates through the heat-insulation material and is connected with the concrete inner leaf wallboard and the concrete outer leaf wallboard;
the axial tension device comprises a vertical actuator, a slide rail fixture cover plate and two slidable fixtures, wherein the upper part of the slide rail fixture cover plate is provided with an end plate, the end plate is connected with the vertical actuator, the slide rail fixture cover plate is connected with the vertical actuator through the end plate by mainly adopting a screw rod, the lower part of the slide rail fixture cover plate is matched with the two slidable fixtures in a symmetrical state to form sliding connection, the slidable fixtures are arranged on the concrete outer leaf wallboard, and the two ends of the slidable fixtures clamp the concrete outer leaf wallboard; the upper part of the concrete outer leaf wallboard is pulled, the slidable fixture is used for clamping the outer leaf wallboard, the position of the actuator is fixed, and when the outer leaf wallboard horizontally moves, the slidable fixture can drive the sliding rail fixture cover plate to move, so that the tension of the upper vertical actuator is ensured to be always upward, an oblique additional tension cannot be generated, and if no sliding rail exists, the upward tension can incline;
the horizontal shearing device comprises a horizontal actuator and a side end clamp, wherein one side of the side end clamp provided with a clamping slot is arranged between two slidable 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 moves upwards, the horizontal actuator of the side edge can be ensured to be always horizontal and to be along the center of the outer leaf wallboard;
the mound support is equipped with 4 and the top is the L type, blocks four angles of leaf wallboard in the concrete respectively to leaf wallboard in the fixed concrete, its mound support bottom is through the crab-bolt anchor on the channel of channel terrace.
Pier support top L notch department is equipped with horizontal fixed plate and the vertical fixation board that fixed connection formed the type of falling L, and vertical fixation board and the slotted perpendicular department fixed connection in pier support upper portion, and horizontal fixed plate arranges the concrete in on the leaf wallboard in, adopts horizontal fixed plate and vertical fixation board to carry the concrete in the leaf wallboard simultaneously, and the level is to, perpendicularly 4 supports of dead interior leaf wallboard of fixed lock, with the crab-bolt anchor on the channel terrace.
A cushion block is horizontally arranged at the top L-shaped groove of the pier support, the concrete inner leaf wallboard can be placed on the cushion block, and when the thickness of the prefabricated concrete sandwich heat-insulation wallboard is smaller, the cushion block is adopted to clamp the concrete inner leaf wallboard, so that the concrete inner leaf wallboard is prevented from laterally moving; the cushion block is a cushion block steel plate or a rubber gasket.
The invention also provides a test method of the integral pulling and shearing test system for the precast concrete sandwich thermal insulation wallboard, which comprises the following steps:
(1) adjusting and fixing the positions of a vertical actuator and a horizontal actuator according to the plane size of the precast concrete sandwich thermal insulation wallboard to be tested and the height of a pier support;
(2) horizontally placing the sandwich heat-insulation wallboard in the step (1), placing the concrete inner leaf wallboard below and placing the concrete outer leaf wallboard above, placing the inner leaf wallboard at the tops of the four buttress seats, and enabling the end part of the inner leaf wallboard to extend into an L-shaped bayonet at the top of the buttress seat; adjusting the plane positions of the buttress bases one by one, and simultaneously plugging a cushion block steel plate or a rubber gasket into a bayonet of the buttress base to enable the buttress base to completely clamp the inner leaf part of the wallboard;
(3) after the four buttress seats are adjusted, the anchor bolts at the bottoms of the buttress seats are screwed down to be completely anchored on the channel terraces, so that the complete fixation of the buttress seats and the inner leaf parts of the wall plates in the horizontal direction and the vertical direction is realized;
(4) the upper part of the concrete outer leaf wallboard is provided with a slidable fixture and a sliding rail fixture cover plate, and the sliding rail fixture cover plate is connected with an upper part vertical actuator through an end plate by adopting a screw rod;
(5) installing a side end clamp at the side end of the concrete outer leaf wallboard, and connecting the side end clamp with a horizontal actuator;
(6) initializing the displacement and force values of a horizontal actuator and a vertical actuator in the electro-hydraulic servo system; preloading is carried out, and the test loading system and the measurement system are ensured to be installed correctly;
(7) in a formal test, a constant horizontal thrust is applied to the concrete outer leaf wallboard through the horizontal actuator, then the tensile force of the upper part is applied step by step through the vertical actuator, and the tensile force can be ensured to be always vertically upward due to the action of the chute fixture; the vertical actuator applies constant vertical pulling force to the concrete outer blade wallboard, then the horizontal actuator gradually applies horizontal pushing force, and the side end part fixture is in spherical contact with the horizontal end part fixture, so that the horizontal pushing force can be ensured to be kept horizontal along the outer blade of the wallboard all the time and in a plane, and the pulling and shearing bearing capacity of the wallboard is verified; and during the exploration performance test, 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-insulation wallboard is subjected to a flat-placing test, the horizontal force is loaded on the outer leaf wallboard to cause the outer leaf wallboard to generate lateral displacement, and the pulling force is inclined and cannot be always vertically upwards; similarly, when the outer blade wall plate is pulled upwards, the outer blade wall plate can generate upward displacement, and the lateral horizontal thrust cannot be kept horizontal at the moment, so that the coordination is difficult. The tensile shear test system adopted by the invention has the following beneficial effects:
(1) the slidable fixture and the sliding rail fixture 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 moves horizontally, the slidable fixture can drive the sliding rail fixture cover plate to move, so that the tension of the upper vertical actuator is ensured to be always upward, and an oblique additional tension cannot be generated;
(2) according to the invention, the side end part clamp is arranged in the horizontal shearing direction, and is adopted to clamp the side edge of the concrete outer leaf wallboard, so that when the outer leaf wallboard moves upwards, the horizontal actuator of the side edge can be ensured to be always horizontal and to be along the center of the outer leaf wallboard;
(3) the bottom of the pier support is anchored on the channel of the channel terrace by the anchor bolt, so that the wallboard is indirectly fixed and prevented from moving;
(4) the pulling and shearing test system can realize the integral pulling and shearing test of the precast concrete sandwich heat-insulating wall panel, solve the technical bottleneck of the current stage, realize the integral pulling and shearing test and fill the industrial blank;
(5) through technical innovation, the invention is beneficial to the development of wallboard products and promotes the technical development of green buildings and assembly type buildings;
(6) the test system is adopted to carry out the tensile-shear test on the whole wallboard, thereby eliminating the serious potential quality safety hazard of the building member and having better social effect;
(7) certain economic benefit is realized for the inspection and detection unit.
Drawings
FIG. 1 is an overall drawing and shearing test system of the precast concrete sandwich thermal insulation wallboard and an overall structural schematic diagram of the sandwich thermal insulation wallboard.
FIG. 2 is a front view of the precast concrete filled thermal insulation wall panel of the present invention.
FIG. 3 is a side view of the precast concrete filled thermal insulation wall panel of the present invention.
Fig. 4 is an overall top view of the slidable clamp, side end clamps and concrete outer leaf panel of the present invention.
FIG. 5 is a schematic structural view of the side end clamp and the precast concrete sandwich thermal insulation wall panel according to the present invention.
Fig. 6 is a schematic view of the connection of the slide rail clamp cover plate, the end plate and the screw rod.
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.
Figure 8 is a side view of the connection of the slidable clamp and the concrete outer leaf panel of the present invention.
FIG. 9 is a partial schematic view of the precast concrete sandwich thermal insulation wallboard fixed with a pier support and a channel terrace according to the present invention.
Each of fig. 1-9 is labeled as: the concrete sandwich heat-insulation wall plate comprises a vertical actuator 1, a horizontal actuator 2, a precast concrete sandwich heat-insulation wall plate 3, a concrete outer leaf wall plate 3-1, a sandwich heat-insulation material 3-2, a concrete inner leaf wall plate 3-3, a drawknot piece 3-4, a slide rail clamp cover plate 4, an end plate 5, a slidable clamp 6, a side end clamp 7, a support 8, a horizontal fixing plate 9, a vertical fixing plate 10, a cushion block 11, an anchor bolt 12, a terrace channel 13 and a screw rod 14.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides an integral pulling and shearing test system for a precast concrete sandwich thermal insulation wallboard, which comprises a horizontal shearing device, an axial tension device and a pier support 8, wherein the horizontal shearing device is connected with the axial tension device;
the precast concrete sandwich heat-insulation wallboard 3 comprises a concrete outer leaf wallboard 3-1, a concrete inner leaf wallboard 3-3, a sandwich heat-insulation material 3-2 between the two and a tie member 3-4 which penetrates through the heat-insulation material and is connected with the inner leaf wallboard and the outer leaf wallboard;
the axial tension device comprises a vertical actuator 1, a slide rail fixture cover plate 4 and two slidable fixtures 6, wherein the upper part of the slide rail fixture cover plate 4 is provided with an end plate 5, the slide rail fixture 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 slide rail fixture cover plate is matched with the two slidable fixtures 6 in a symmetrical state to form sliding connection, the slidable fixtures 6 are arranged on the concrete outer leaf wallboard 3-1, and the two ends of the slidable fixtures 6 clamp the concrete outer leaf wallboard 3-1; the upper part of the concrete outer leaf wallboard 3-1 is pulled, the slidable fixture 6 is used for clamping the outer leaf wallboard, the position of the actuator is fixed, when the outer leaf wallboard horizontally moves, the slidable fixture 6 can drive the sliding rail fixture cover plate 4 to move, so that the tension of the upper vertical actuator 1 is ensured to be always upward, an oblique additional tension cannot be generated, and if no sliding rail exists, the upward tension 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, which is provided with a clamping slot, 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 the side end clamp 7, and when the outer leaf wallboard moves upwards, the horizontal actuator 2 of the side edge can be ensured to be always horizontal and to be along the center of the outer leaf wallboard;
the pier support 8 is provided with 4 pier supports, the tops of the pier supports are L-shaped, four corners of the concrete inner leaf wall boards 3-3 are clamped respectively, so that the concrete inner leaf wall boards 3-3 are fixed, and the bottoms of the pier supports 8 are anchored on the channel of the channel terrace 13 through anchor bolts 12.
The horizontal fixing plate 9 and the vertical fixing plate 10 which are fixedly connected to form an inverted L shape are arranged at the position of an L-shaped groove in the top of the pier support 8, the vertical fixing plate 10 is fixedly connected with the vertical position of the groove in the upper portion of the pier support 8, the horizontal fixing plate 9 is arranged on the concrete inner leaf wallboard 3-3, the horizontal fixing plate 9 and the vertical fixing plate 10 are adopted to clamp the concrete inner leaf wallboard 3-3, 4 supports of the inner leaf wallboard are horizontally and vertically fixedly locked, and the inner leaf wallboard is anchored on the terrace 13 through anchor bolts 12.
A cushion block 11 is horizontally arranged at an L-shaped groove opening at the top of the pier support 8, the concrete inner leaf wallboard 3-3 is arranged on the cushion block 11, and when the thickness of the precast concrete sandwich heat-insulation wallboard 3 is smaller, the cushion block 11 is adopted to clamp the concrete inner leaf wallboard 3-3, so that the lateral movement of the precast concrete sandwich heat-insulation wallboard is avoided; the cushion block 11 is a cushion block steel plate or a rubber gasket.
The test system is adopted to carry out the tensile shear test on the whole precast concrete sandwich heat-insulating wall plate, and the specific test steps are as follows:
(1) adjusting and fixing the positions of a vertical actuator and a horizontal actuator according to the plane size of the precast concrete sandwich thermal insulation wallboard to be tested and the height of a pier support;
(2) horizontally placing the sandwich heat-insulation wallboard in the step (1), placing the concrete inner leaf wallboard below and placing the concrete outer leaf wallboard above, placing the inner leaf wallboard at the tops of the four buttress seats, and enabling the end part of the inner leaf wallboard to extend into an L-shaped bayonet at the top of the buttress seat; adjusting the plane positions of the buttress bases one by one, and simultaneously plugging a cushion block steel plate or a rubber gasket into a bayonet of the buttress base to enable the buttress base to completely clamp the inner leaf part of the wallboard;
(3) after the four buttress seats are adjusted, the anchor bolts at the bottoms of the buttress seats are screwed down to be completely anchored on the channel terraces, so that the complete fixation of the buttress seats and the inner leaf parts of the wall plates in the horizontal direction and the vertical direction is realized;
(4) the upper part of the concrete outer leaf wallboard is provided with a slidable fixture and a sliding rail fixture cover plate, and the sliding rail fixture cover plate is connected with an upper part vertical actuator through an end plate by adopting a screw rod;
(5) installing a side end clamp at the side end of the concrete outer leaf wallboard, and connecting the side end clamp with a horizontal actuator;
(6) initializing the displacement and force values of a horizontal actuator and a vertical actuator in the electro-hydraulic servo system; preloading is carried out, and the test loading system and the measurement system are ensured to be installed correctly;
(7) in a formal test, a constant horizontal thrust is applied to the concrete outer leaf wallboard through the horizontal actuator, then the tensile force of the upper part is applied step by step through the vertical actuator, and the tensile force can be ensured to be always vertically upward due to the action of the chute fixture; the vertical actuator applies constant vertical pulling force to the concrete outer blade wallboard, then the horizontal actuator gradually applies horizontal pushing force, and the side end part fixture is in spherical contact with the horizontal end part fixture, so that the horizontal pushing force can be ensured to be kept horizontal along the outer blade of the wallboard all the time and in a plane, and the pulling and shearing bearing capacity of the wallboard is verified; and during the exploration performance test, 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-insulation wallboard is subjected to a flat-placing test, the horizontal force is loaded on the outer leaf wallboard to cause the outer leaf wallboard to generate lateral displacement, and the pulling force is inclined and cannot be always vertically upwards; similarly, when the outer blade wall plate is pulled upwards, the outer blade wall plate can generate upward displacement, and the lateral horizontal thrust cannot be kept horizontal at the moment, so that the coordination is difficult. By adopting the pulling and shearing test system, the whole pulling and shearing test of the precast concrete sandwich heat-insulating wall panel can be realized, the blank of the industry is filled, and the serious potential quality safety hazard of building components can be eliminated.
Claims (7)
1. The utility model provides a test system is cut to whole drawing of precast concrete with filling heat preservation wallboard which characterized in that: comprises a horizontal shearing device, an axial tension device and a pier support (8);
the precast concrete sandwich heat-insulation wallboard (3) comprises a concrete outer leaf wallboard (3-1), a concrete inner leaf wallboard (3-3), a sandwich heat-insulation material (3-2) between the concrete outer leaf wallboard and the concrete inner leaf wallboard, and a tie piece (3-4) which penetrates through the heat-insulation material and is connected with the inner leaf wallboard and the outer leaf wallboard;
the axial tension device comprises a vertical actuator (1), a slide rail clamp cover plate (4) and two slidable clamps (6); the upper part of the slide rail clamp cover plate (4) is provided with an end plate (5), and the end plate (5) is connected with the vertical actuator (1); the lower part of the slide rail clamp cover plate (4) is matched with two symmetrical slidable clamps (6) to form sliding connection, the slidable clamps (6) are arranged on the concrete outer leaf wallboard (3-1), and the two ends of the slidable clamps clamp the concrete outer leaf wallboard (3-1);
the horizontal shearing device comprises a horizontal actuator (2) and a side end clamp (7), 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 four corners of the concrete inner leaf wall boards (3-3) are clamped respectively.
2. The precast concrete sandwich thermal insulation wallboard integral pulling and shearing test system as claimed in claim 1, wherein the end plate (5) on the slide rail clamp cover plate (4) is connected with the vertical actuator (1) by a screw (14).
3. The precast concrete sandwich thermal insulation wallboard integral pulling and shearing test system as claimed in claim 1, wherein a horizontal fixing plate (9) and a vertical fixing plate (10) which are fixedly connected to form an inverted L shape are arranged at an L-shaped notch at the top of the pier support (8), the vertical fixing plate (10) is fixedly connected with a vertical part of the upper groove 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 the horizontal fixing plate (9) and the vertical fixing plate (10).
4. The precast concrete sandwich thermal insulation wallboard integral pulling and shearing test system as claimed in claim 1, wherein the bottom of the pier support (8) is anchored on the channel of the channel terrace (13) through an anchor bolt (12).
5. The precast concrete sandwich thermal insulation wallboard integral pulling and shearing test system as claimed in claim 1, wherein a cushion block (11) is horizontally arranged on an L-shaped notch at the top of the pier support (8).
6. The precast concrete sandwich thermal insulation wallboard integral pulling and shearing test system as claimed in claim 5, wherein the cushion block (11) is a cushion block steel plate or a rubber gasket.
7. A test method of the integral pulling and shearing test system of the precast concrete sandwich thermal insulation wallboard according to any one of claims 1 to 6 is characterized by comprising the following specific steps:
(1) adjusting and fixing the positions of a vertical actuator and a horizontal actuator according to the plane size of the precast concrete sandwich thermal insulation wallboard to be tested and the height of a pier support;
(2) horizontally placing the sandwich heat-insulation wallboard in the step (1), placing the concrete inner leaf wallboard below and placing the concrete outer leaf wallboard above, placing the inner leaf wallboard at the tops of the four buttress seats, and enabling the end part of the inner leaf wallboard to extend into an L-shaped bayonet at the top of the buttress seat; adjusting the plane positions of the buttress bases one by one, and simultaneously plugging a cushion block steel plate or a rubber gasket into a bayonet of the buttress base to enable the buttress base to completely clamp the inner leaf part of the wallboard;
(3) after the four buttress seats are adjusted, the anchor bolts at the bottoms of the buttress seats are screwed down to be completely anchored on the channel terraces, so that the complete fixation of the buttress seats and the inner leaf parts of the wall plates in the horizontal direction and the vertical direction is realized;
(4) the upper part of the concrete outer leaf wallboard is provided with a slidable fixture and a sliding rail fixture cover plate, and the sliding rail fixture cover plate can be connected with an upper part vertical actuator through an end plate by adopting a screw rod;
(5) installing a side end clamp at the side end of the concrete outer leaf wallboard, and connecting the side end clamp with a horizontal actuator;
(6) initializing the displacement and force values of a horizontal actuator and a vertical actuator in the electro-hydraulic servo system; preloading is carried out, and the test loading system and the measurement system are ensured to be installed correctly;
(7) in a formal test, a constant horizontal thrust is applied to the concrete outer leaf wallboard through the horizontal actuator, then the tensile force of the upper part is applied step by step through the vertical actuator, and the tensile force can be ensured to be always vertically upward due to the action of the chute fixture; the vertical actuator applies constant vertical pulling force to the concrete outer blade wallboard, then the horizontal actuator gradually applies horizontal pushing force, and the side end part fixture is in spherical contact with the horizontal end part fixture, so that the horizontal pushing force can be ensured to be kept horizontal along the outer blade of the wallboard all the time and in a plane, and the pulling and shearing bearing capacity of the wallboard is verified; and during the exploration performance test, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113447370A true CN113447370A (en) | 2021-09-28 |
| CN113447370B CN113447370B (en) | 2023-05-30 |
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