CN116380440B - Movable reaction frame for performance test of prefabricated staircase structure - Google Patents
Movable reaction frame for performance test of prefabricated staircase structure Download PDFInfo
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- CN116380440B CN116380440B CN202310421770.2A CN202310421770A CN116380440B CN 116380440 B CN116380440 B CN 116380440B CN 202310421770 A CN202310421770 A CN 202310421770A CN 116380440 B CN116380440 B CN 116380440B
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- 238000011056 performance test Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000008093 supporting effect Effects 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 239000003351 stiffener Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
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- 238000009434 installation Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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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
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
Abstract
The invention discloses a movable counterforce frame for a prefabricated staircase structural performance test, which comprises a base frame and counterforce frames, wherein sliding grooves are formed in the tops of two base longitudinal beams opposite to the base frame, conversion plates are arranged at the two bottoms of the counterforce frames, conversion screws are arranged on the conversion plates, the conversion screws penetrate through the sliding grooves and are used for locking the conversion plates on the corresponding base longitudinal beams, the conversion plates can move along the length direction of the sliding grooves, the number of the sliding grooves on each base longitudinal beam is 2, the base longitudinal beams are prepared by adopting I-steel or H-shaped steel, and a plurality of stiffening plates are arranged between an upper flange plate and a lower flange plate of the base longitudinal beams and on one side, far away from a web, of the sliding grooves; the upper flange plate surface is also provided with two stiffening strips, the two stiffening strips are symmetrically arranged along the web plate, the stiffening strips and the upper flange are matched to form an L-shaped or T-shaped section, and the conversion plate is erected on the two stiffening strips. The counterforce portal can move on line, has a light structure, is convenient to operate, and is simple and reliable to adjust.
Description
Technical Field
The invention relates to the technical field of assembly type building detection, in particular to a movable reaction frame for a prefabricated staircase structure performance test.
Background
The assembled building has the advantages of high industrialization level, quick installation and construction, reduced labor cost, energy conservation, environmental protection and the like, and becomes the main stream direction of the development of the building industry at home and abroad. The prefabricated stairway is convenient and quick to construct, and can be used for constructors to pass and transport materials in real time after being installed in place, so that an important effect is exerted on site construction efficiency improvement. In addition, the prefabricated staircase has the characteristics of saving templates, improving the operation environment of a construction site, having excellent appearance quality and the like. Thus, prefabricated stairways are often one of the necessary options in prefabricated building prefabrication schemes.
The stairs are different in form and can be mainly divided into single-track stairs and double-track stairs, wherein the single-track stairs are characterized in that rest platforms are not arranged between stair sections connecting upper and lower floors, the direction of the single-track stairs is not changed, the height of the single-track stairs is close to the floor height of a building, and for residential projects, the height of the single-track stairs is between 2.8m and 3.2 m. The double-track stair is characterized in that a rest platform is arranged in the middle of a stair bench connecting an upper layer and a lower layer, the direction is changed once, the height of the single-piece prefabricated stair is about half of the height of a building layer, and for residential projects, the height of the single-piece prefabricated stair is between 1.4m and 1.6 m.
In order to ensure the safe and reliable quality of the prefabricated staircase, the specification of GB50204-2015 'inspection and acceptance Specification of construction quality of concrete structural engineering' specifies that structural performance inspection should be performed when a beam and plate type flexural member enters the field, and specifies inspection indexes of the structural performance of the prefabricated member. It can be seen that structural performance inspection is an important measure for assessing the approach quality of prefabricated stairways. However, since the prefabricated stairway in the single running form and the prefabricated stairway in the double running form have large difference in height and span, and the prefabricated stairway in the single running form has high height, the convenience and safety of load application in the performance test process of the prefabricated stairway structure and the applicability of the single test device to the prefabricated stairway in different sizes are greatly challenged.
At present, the performance test of the prefabricated staircase structure mainly adopts the following three modes: (1) inclined placement of stairs, uniformly distributing and loading by adopting load weights; (2) The stairway is put obliquely, a 'fixed' counter-force portal is adopted, and a distribution beam system is matched for carrying out multipoint concentrated force loading; and (3) flatly placing the stairs, and uniformly distributing and loading by adopting load blocks.
In the first mode, the stairs are in an inclined state, load blocks are adopted for uniformly distributing and loading, and manual carrying of the load blocks is usually required to be carried on the stairs in the loading process. For a double-track stair, the height of the double-track stair is half of the height of a floor, namely 1.4 m-1.6 m, and a detector can stand on the ground and then carry the load blocks to each step of the stair from two sides of the stair. However, for single running stairs, the height is the height of the storey, namely 2.8 m-3.2 m, and the inspector can only place the load block on the higher-level steps through going up and down stairs, so that the action is very complicated, and safety accidents caused by the damage of the stairs can occur when the prefabricated stairs are loaded to the adjacent bearing capacity for inspecting loads.
In the second mode, the stairs are in an inclined state, a 'fixed' counter-force portal is adopted and matched with a distribution beam system to carry out multipoint concentrated force loading, the counter-force portal is usually a portal frame, the lower end of the counter-force portal is anchored in the ground through anchor bolts and is fixed, concentrated force is applied to a midspan position during loading, and then distribution is carried out through the distribution beam. The difference in height is very large between the single running stairs and the double running stairs, the difference in span is also very large, the span of the double running stairs is generally 3m or less, the span of the single running stairs can reach 5m, the loading requirements of the different-span stairs are met, the counterforce portal is ensured to be always positioned at the middle position of the stairs to provide counterforce, the high support and the short support at the two ends are required to be moved simultaneously, and the counterforce portal is ensured to be always positioned at the middle position of the high support and the short support by relatively keeping away from or closing up the high support and the short support. The prefabricated stairway is obliquely placed on the supports at the two ends, the high support is usually a portal frame consisting of two upright posts and one middle cross beam, the heights of the two upright posts are larger than the maximum height of the single-track stairway, namely, larger than 3.2m, and the portal frame with the height cannot be stably kept with the ground in a temporary fixing mode. However, if the high support is firmly connected with the ground, the problem of inconvenient movement and even no movement can be caused, and the loading of stairs with different spans cannot be realized only by moving the low support.
In the third mode, the stairs are in a horizontal placing state, and the loading blocks are adopted for uniformly distributing and loading, so that the height of the stair test piece in a test state is reduced, and the detection personnel can conveniently carry the loading blocks to place the loading blocks on the stair steps, so that the stairs have a certain difference from the actual working state of the stairs, and a certain dispute still exists in the industry.
In conclusion, the existing test device for the performance of the prefabricated staircase structure and the corresponding test method thereof have limitations when dealing with prefabricated stairways with different heights and spans, and cannot completely meet test requirements. Therefore, it is necessary to design and develop the reaction force portal part of the performance test apparatus for the prefabricated staircase structure according to the second aspect.
Disclosure of Invention
The invention aims to solve the technical problem of providing a movable counterforce frame for a prefabricated staircase structure performance test, which can move on line, has a light structure, is convenient to operate and is simple and reliable to adjust.
In order to solve the technical problems, the invention provides a movable counterforce frame for a prefabricated staircase structural performance test, which comprises a base frame and a counterforce portal, wherein sliding grooves are formed in the tops of two base longitudinal beams opposite to the base frame, conversion plates are arranged on the two bottoms of the counterforce portal, conversion screws are arranged on the conversion plates, the conversion screws penetrate through the sliding grooves and are used for locking the conversion plates on the corresponding base longitudinal beams, the conversion plates can move along the length direction of the sliding grooves, the counterforce portal comprises counterforce beams, two ends of each counterforce beam are clamped through a lower supporting plate and an upper top plate, the lower supporting plate and the upper top plate on the same side are arranged on the two force transmission screws and are fixed through height adjusting nuts, the end parts of each counterforce beam are arranged between the two force transmission screws, and the bottoms of the two force transmission screws are connected with the corresponding conversion plate;
the number of the sliding grooves on each base longitudinal beam is 2, the base longitudinal beams are prepared from I-steel or H-steel, the two sliding grooves are symmetrically arranged on the upper flange plate of the base longitudinal beam along the web plate, and a plurality of stiffening plates are arranged between the upper flange plate and the lower flange plate of the base longitudinal beam and on one side of the sliding grooves far away from the web plate; the upper flange plate surface is also provided with two stiffening strips, the two stiffening strips are symmetrically arranged along the web plate, the stiffening strips are consistent with the chute in length, the stiffening strips and the upper flange plate are matched to form an L-shaped or T-shaped section, and the conversion plate is erected on the two stiffening strips.
Furthermore, the force transmission screw is formed by connecting a plurality of short screws through connecting sleeves, the force transmission screw is connected with the conversion plate through threaded sleeves, and the threaded sleeves are fixed on the conversion plate.
Further, the bottoms of the conversion plates corresponding to the stiffening strips are also provided with sliding grooves, and the conversion plates are erected on the stiffening strips through the sliding grooves.
Further, the number of the conversion screw rods on each conversion plate is 4, four conversion screw rods are arranged in two sliding grooves in pairs, and the distance between each conversion screw rod and the center of the conversion plate is consistent.
Further, the length l= (L) max -L min ) 2+2c, wherein L max Refers to the maximum span of the prefabricated staircase, L min The minimum span of the prefabricated staircase is indicated, c is the vertical distance from the outer edge of the conversion screw to the center of the conversion plate along the length direction of the chute, and the horizontal distance from the starting point of the chute section to the high-position support for placing the prefabricated staircase is (L) min And (2) -c), wherein the horizontal distance between the end point of the chute section and the high support for placing the prefabricated staircase is (L) max /2)+c。
Further, the thickness of the upper top plate is not smaller than 30mm, and the thickness of the lower supporting plate is not smaller than 10mm.
Further, the diameter of the force transmission screw is not smaller than 20mm, and the diameter of the conversion screw is not smaller than 14mm.
Further, the stiffening plates are vertical to the web plate, the distance between every two adjacent stiffening plates is not more than 200mm, and the width of each stiffening plate is smaller than the distance between the outer edge of the upper flange plate and the outer edge of one side of the chute far away from the web plate.
Further, the width of the chute is between 16mm and 20 mm.
The invention has the beneficial effects that:
1. the base frame is introduced to replace an underground anchoring part to bear the self-reaction force of the counter-force portal, and the through long sliding chute arranged on the base longitudinal beam can meet the sliding requirement of the counter-force portal, so that the structure is simple and the operation is convenient;
2. in order to further enable the bearing capacity and rigidity of the sliding groove to meet the use requirements, the spaced reinforcing structure is skillfully combined with the continuous reinforcing structure, wherein the spaced reinforcing structure is formed by arranging a plurality of stiffening plates between the upper flange plate and the lower flange plate of the base longitudinal beam and on one side of the sliding groove far away from the web plate, the stiffening plates are spaced by the same distance, and the upper flange plate and the lower flange plate of the base longitudinal beam are connected from the outer side of the sliding groove, so that the stress span of the sliding groove section is shortened from the original whole sliding groove to the spacing distance of the stiffening plates, and the continuity of the sliding groove is not affected; the continuous reinforcing structure is characterized in that through-length stiffening strips are additionally arranged at the edges of two sides of the upper flange plate of the base longitudinal beam corresponding to the chute section and are welded with the upper flange plate, so that the upper flange plate part outside the chute is stressed and reinforced into L-shaped steel or T-shaped steel by original single thin steel bars, and the chute is still kept to be communicated; finally, the reinforced base longitudinal beam sliding groove section can simultaneously meet the use function requirement of the counterforce door frame when moving left and right and the stress performance requirement of the self-reaction force of the counterforce door frame on the sliding groove section when being loaded in a test, so that the test device with the movable counterforce frame can be suitable for structural performance tests of stairs with different spans and heights.
3. And a counterforce beam of the counterforce portal is connected with the base frame through a force transmission screw rod, so that the counterforce portal is integrally light and convenient to move.
4. Through the setting of conversion board and conversion screw rod, with the average share of the self-reaction force of counter-force portal to four spouts, be favorable to guaranteeing the atress performance of spout section more.
5. The two side edges of the flange plate on the base longitudinal beam are additionally provided with the through-long stiffening strips, so that the sliding rail of the conversion plate and the whole counterforce portal is used for reducing the friction force of the counterforce portal during sliding and reducing the labor intensity of detection personnel while strengthening the sliding groove part.
Drawings
FIG. 1 is a schematic view of the overall structure of a reaction frame of the present invention;
FIG. 2 is a schematic view of the connection at the end of the reaction beam of the present invention;
FIG. 3 is a schematic view of the connection structure of the bottom of the reaction portal to the base frame of the present invention;
FIG. 4 is a schematic view of the connection structure at the lower surface of the upper flange plate of the base stringer of the present invention;
FIG. 5 is a schematic view of the bottom structure of the conversion plate of the present invention;
FIG. 6 is a schematic view of a cross-sectional connection between a base stringer and a conversion plate in accordance with the present invention;
fig. 7 is a schematic view of the overall structure of the present invention in use.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Referring to fig. 1 and 2, an embodiment of a movable reaction frame for a performance test of a prefabricated staircase structure according to the present invention includes a base frame 1 and a reaction portal 2, wherein sliding grooves 3 are respectively provided at the top of two opposite base stringers 20 of the base frame, conversion plates 4 are respectively provided at the two bottoms of the reaction portal, conversion screws 5 are provided on the conversion plates, and pass through the sliding grooves and are used for locking the conversion plates on the corresponding base stringers, and the conversion plates can move along the length direction of the sliding grooves. The base frame is used for bearing the self-reaction force of the counterforce portal, and has a connecting and supporting effect in the moving process of the counterforce portal, the counterforce portal stretches into the sliding groove to be limited and guided in the moving process of the counterforce portal, the conversion plate is used for improving the stability of the bottom of the counterforce portal in moving and is connected with the conversion screw, the diameter of the conversion screw is not less than 14mm, and the connecting strength requirement is met;
the counter-force portal comprises a counter-force beam 6, both ends of the counter-force beam are clamped through a lower supporting plate 7 and an upper top plate 8, the lower supporting plate and the upper top plate on the same side are arranged on two force transmission screws 9 and are fixed through a height adjusting nut 10, the end parts of the counter-force beam are arranged between the two force transmission screws, the bottoms of the two force transmission screws are connected with a corresponding conversion plate, four force transmission screws at both ends of the counter-force beam can effectively support the counter-force beam, meanwhile, the integral mass of the counter-force portal is reduced, the counter-force portal is convenient to move, the diameter of the force transmission screw is not less than 20mm, the acting force on the counter-force beam can be transmitted to a base frame through the upper top plate, the force transmission screws, the conversion plate and the conversion screw, the counter-force beam can be effectively supported by the lower supporting plate, the thickness of the upper top plate is not less than 30mm, the stability of the counter-force transmission is met, and the thickness of the lower supporting plate is not less than 10mm.
In use, referring to fig. 7, in a state that the counter-force beam of the counter-force portal is not installed, according to the size of the prefabricated staircase, the high support 111 and the low support 112 for placing the prefabricated staircase are arranged at two ends of the length direction of the base frame, the prefabricated staircase is hoisted and placed on the high support and the low support, then the conversion plate and the force transmission screw are pushed to move to corresponding detection positions along the sliding groove according to the size of the prefabricated staircase, then the counter-force beam is installed in place, and then the conversion screw is locked, so that the conversion plate is fixed with the base longitudinal beam, the counter-force portal is not movable, and then the loading beam, the rolling support, the fixed support, the distribution beam 113 and the jack are uniformly distributed on the prefabricated staircase in sequence from bottom to top, so that the detection operation can be performed.
After the detection is finished, the upper top plate, the counter-force beam, the jack, the distribution beam, the rolling support, the fixed support and the uniformly distributed loading beam are removed, the prefabricated staircase 114 is lifted away, and then the prefabricated staircase can be adjusted and installed according to the size of the next prefabricated staircase to enter the next detection operation.
In order to facilitate assembly and disassembly, the force transmission screw is designed to be formed by connecting a plurality of short screws 11 through connecting sleeves 12, so that the preparation cost is reduced, the force transmission screw is connected with the conversion plate through threaded sleeves, and the threaded sleeves are fixed on the conversion plate.
Referring to fig. 3 to 6, in order to improve stability during sliding movement, the number of sliding grooves on each base longitudinal beam is 2, the base longitudinal beams are made of i-steel or H-steel, the installation of a high support and a low support is facilitated, the overall strength is high, bending rigidity is high, reliable anchoring force can be provided for a counter-force portal in the process of a prefabricated stair loading test, two sliding grooves are symmetrically formed on an upper flange plate of the base longitudinal beam along a web plate, a plurality of stiffening plates 13 are arranged between the upper flange plate and a lower flange plate of the base longitudinal beam and on one side, far away from the web plate, of the sliding grooves, after the sliding grooves are formed, the parts of the upper flange plate on the outer sides of the sliding grooves form steel bar structures with two ends connected, so that the strength of the positions is reduced, the stiffening plates are effectively reinforced, the stiffening plates do not influence movement of a conversion screw rod, and the distance between two adjacent stiffening plates is not greater than 200mm. The stress span of the flange plate at the outer side part of the chute is reduced by arranging a plurality of stiffening plates.
The upper flange plate surface is also provided with two stiffening strips 14, the two stiffening strips are symmetrically arranged along the web, the stiffening strips are positioned on the upper part of the upper flange plate corresponding to the stiffening plates, the original straight thin plate section is lifted to be an L-shaped or T-shaped section, the moment of inertia of the section is greatly increased, and the bending rigidity of the section is improved, namely the bearing capacity of the upper flange plate is enhanced. The conversion board bottom that foretell two stiffeners correspond still is provided with sliding groove 15, and the conversion board is set up on the stiffener through sliding groove, and at this moment, the conversion board is at the removal in-process, and it no longer contacts with base longeron surface, but contacts with the stiffener through sliding groove, and the area of contact when having significantly reduced the slip of such a mode reduces frictional force to sliding groove still has spacing direction function, further improves the mobility stability.
Through the arrangement of the stiffening plates and the stiffening strips, the bearing capacity and the rigidity of the position of the sliding chute can meet the use requirements, the spaced reinforcing structure is skillfully combined with the coherent reinforcing structure, wherein the spaced reinforcing structure is formed by arranging a plurality of stiffening plates between the upper flange plate and the lower flange plate of the base longitudinal beam and on one side of the sliding chute far away from the web plate, the stiffening plates are spaced at the same distance, and the upper flange plate and the lower flange plate of the base longitudinal beam are connected from the outer side of the sliding chute, so that the stress span of the sliding chute section is shortened to the spacing distance of the stiffening plates from the original whole sliding chute, and the continuity of the sliding chute is not influenced; the continuous reinforcing structure is characterized in that the two side edges of the upper flange plate of the base longitudinal beam corresponding to the chute section are additionally provided with stiffening strips in a through length mode and are welded with the upper flange plate, so that the upper flange plate part outside the chute is stressed and reinforced into L-shaped steel or T-shaped steel by original single thin steel bars, and the chute is still kept to be communicated.
The number of the conversion screw rods on each conversion plate is 4, four conversion screw rods are arranged in two sliding grooves in pairs, the distance between each conversion screw rod and the center of the conversion plate is consistent, the stability during movement is guaranteed, and the fixing effect is excellent.
The reaction frame needs to be suitable for prefabricated stairway with different sizes, so that the size of the sliding groove is limited, and the length L= (L) max -L min ) 2+2c, wherein L max Refers to the maximum span of the prefabricated staircase, L min C is the vertical distance from the outer edge of the conversion screw to the center of the conversion plate along the length direction of the chute, and the horizontal distance from the starting point of the chute section to the high-position support for placing the prefabricated staircase is (L) min And (2) -c, wherein the horizontal distance between the end point of the chute section and the high-position support for placing the prefabricated staircase is (L) max And 2) +c, the height of the high support is not adjustable in the horizontal direction, but the height of the low support is not adjustable, but the position of the low support can be adjusted in the horizontal direction, so that the sliding groove arrangement and the matching of the prefabricated stairs with different sizes can be met.
The above embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. The movable counterforce frame for the performance test of the prefabricated staircase structure is characterized by comprising a base frame and a counterforce portal, wherein sliding grooves are formed in the tops of two base longitudinal beams opposite to the base frame, conversion plates are arranged at the two bottoms of the counterforce portal, conversion screws are arranged on the conversion plates, the conversion screws penetrate through the sliding grooves and are used for locking the conversion plates on the corresponding base longitudinal beams, the conversion plates can move along the length direction of the sliding grooves, the counterforce portal comprises a counterforce beam, two ends of the counterforce beam are clamped through a lower supporting plate and an upper top plate, the lower supporting plate and the upper top plate on the same side are arranged on two force transmission screws and are fixed through height adjusting nuts, the end parts of the counterforce beam are arranged between the two force transmission screws, and the bottoms of the two force transmission screws are connected with the corresponding conversion plate;
the number of the sliding grooves on each base longitudinal beam is 2, the base longitudinal beams are prepared from I-steel or H-steel, the two sliding grooves are symmetrically arranged on the upper flange plate of the base longitudinal beam along the web plate, and a plurality of stiffening plates are arranged between the upper flange plate and the lower flange plate of the base longitudinal beam and on one side of the sliding grooves far away from the web plate; the surface of the upper flange plate is also provided with two stiffening strips, the two stiffening strips are symmetrically arranged along the web plate, the stiffening strips are consistent with the sliding grooves in length, the stiffening strips and the upper flange plate are matched to form an L-shaped or T-shaped section, and the conversion plate is erected on the two stiffening strips;
the length L= (L) max -L min ) 2+2c, wherein L max Refers to the maximum span of the prefabricated staircase, L min The minimum span of the prefabricated staircase is indicated, c is the vertical distance from the outer edge of the conversion screw to the center of the conversion plate along the length direction of the chute, and the horizontal distance from the starting point of the chute section to the high-position support for placing the prefabricated staircase is (L) min And (2) -c), wherein the horizontal distance between the end point of the chute section and the high support for placing the prefabricated staircase is (L) max /2)+c。
2. The movable counterforce frame for the performance test of the prefabricated staircase structure according to claim 1, wherein the force transmission screw is formed by connecting a plurality of short screws through connecting sleeves, the force transmission screw is connected with the conversion plate through threaded sleeves, and the threaded sleeves are fixed on the conversion plate.
3. The movable reaction frame for the performance test of the prefabricated staircase structure according to claim 1, wherein the bottoms of the conversion plates corresponding to the two stiffening strips are also provided with sliding grooves, and the conversion plates are erected on the stiffening strips through the sliding grooves.
4. The movable reaction frame for the performance test of the prefabricated staircase structure according to claim 1, wherein the number of the conversion screws on each conversion plate is 4, four conversion screws are arranged in two sliding grooves in pairs, and the distance between each conversion screw and the center of the conversion plate is consistent.
5. The movable reaction frame for the performance test of the prefabricated staircase structure according to claim 1, wherein the thickness of the upper top plate is not less than 30mm, and the thickness of the lower supporting plate is not less than 10mm.
6. A movable reaction frame for performance test of prefabricated stairway structure according to claim 1, wherein the diameter of the force transmission screw is not smaller than 20mm and the diameter of the conversion screw is not smaller than 14mm.
7. The movable reaction frame for the performance test of the prefabricated staircase structure according to claim 1, wherein the stiffening plates are vertical relative to the web plate, the distance between two adjacent stiffening plates is not more than 200mm, and the width of the stiffening plates is smaller than the distance between the outer edge of the upper flange plate and the outer edge of the side, away from the web plate, of the chute.
8. A movable reaction frame for performance test of prefabricated stairway structure according to claim 1, characterised in that the width of the runner is between 16mm and 20 mm.
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| CN202310421770.2A CN116380440B (en) | 2023-04-19 | 2023-04-19 | Movable reaction frame for performance test of prefabricated staircase structure |
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| CN202310421770.2A CN116380440B (en) | 2023-04-19 | 2023-04-19 | Movable reaction frame for performance test of prefabricated staircase structure |
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| CN116380440B true CN116380440B (en) | 2024-01-26 |
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| CN210603852U (en) * | 2019-09-26 | 2020-05-22 | 长安大学 | Full-assembly type steel structure reaction frame |
| CN111693269A (en) * | 2020-06-30 | 2020-09-22 | 李思锦 | Stair structural performance test device |
| CN216645808U (en) * | 2021-11-18 | 2022-05-31 | 亚泰集团沈阳现代建筑工业有限公司 | Prefabricated reinforced concrete slab stair structure performance test bench |
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2023
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1951778A (en) * | 1933-05-12 | 1934-03-20 | Snead & Company | Metallic partition structure |
| CN206601248U (en) * | 2017-04-12 | 2017-10-31 | 海南大学 | Multi-functional adjustable assembled reaction frame |
| CN210603852U (en) * | 2019-09-26 | 2020-05-22 | 长安大学 | Full-assembly type steel structure reaction frame |
| CN111693269A (en) * | 2020-06-30 | 2020-09-22 | 李思锦 | Stair structural performance test device |
| CN216645808U (en) * | 2021-11-18 | 2022-05-31 | 亚泰集团沈阳现代建筑工业有限公司 | Prefabricated reinforced concrete slab stair structure performance test bench |
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| CN116380440A (en) | 2023-07-04 |
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