CN110748102A - Prefabricated staircase support stop device that slides - Google Patents
Prefabricated staircase support stop device that slides Download PDFInfo
- Publication number
- CN110748102A CN110748102A CN201911080233.6A CN201911080233A CN110748102A CN 110748102 A CN110748102 A CN 110748102A CN 201911080233 A CN201911080233 A CN 201911080233A CN 110748102 A CN110748102 A CN 110748102A
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- China
- Prior art keywords
- steel pipe
- embedded steel
- tie rod
- stair
- limiting
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/022—Stairways; Layouts thereof characterised by the supporting structure
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F2011/0203—Miscellaneous features of stairways not otherwise provided for
- E04F2011/0205—Stairways characterised by the use of specific materials for the supporting structure of the treads
- E04F2011/021—Stairways characterised by the use of specific materials for the supporting structure of the treads mainly of stone or stone like materials, e.g. concrete; mainly of glass
- E04F2011/0212—Stairways characterised by the use of specific materials for the supporting structure of the treads mainly of stone or stone like materials, e.g. concrete; mainly of glass mainly of concrete
Abstract
The invention discloses a prefabricated staircase sliding support limiting device which is used for limiting the relative sliding of a prefabricated concrete staircase and a staircase beam and comprises a tie rod (1) and an embedded steel pipe (2); the embedded steel pipe (2) is embedded at the lower part of the precast concrete stair platform, one end of the tie rod (1) is anchored in the stair beam, and the other end of the tie rod is sleeved in the embedded steel pipe (2); the inner wall of the embedded steel pipe (2) is provided with a shrinkage limiting mechanism (21) for limiting the longitudinal shrinkage of the tie rod (1). The prefabricated staircase sliding support limiting device has the advantages that the stress design of the components is consistent with the deformation direction, the stress is reasonable, and the strength is high; the main components are arranged in the building, so that the building appearance is not influenced, the durability is good, and the occupied space is small; easy construction and installation and reliable structural connection.
Description
Technical Field
The invention belongs to the technical field of building structure shock insulation, and particularly relates to a prefabricated staircase sliding support limiting device which is good in overall stress performance, good in durability, small in occupied space, high in strength and easy to maintain.
Background
With the development of housing industrialization, the assembly type building in China is greatly popularized. Research shows that the structure of the sliding support between the ladder beam and the ladder section of the precast concrete stair reduces the 'diagonal bracing' effect on the building frame structure relative to the cast-in-place concrete stair, and greatly reduces the possibility of damage when the earthquake happens to the ladder plate.
However, the separated construction form at the precast concrete stair sliding support can generate the risk of the ladder section sliding and separating from the ladder beam under the action of earthquake force, especially in rare earthquake situations. The stair is used as an important building component and is a vertical traffic channel and the only escape channel in earthquake, so that the problem of structural damage of large displacement in earthquake at the position of the prefabricated stair sliding support is solved.
At present, most of the existing construction methods are vertical steel bar anchor insertion connection or shock insulation rubber support connection. For example, the Chinese patent with the publication number of CN206752892U invents a limit lap joint device on the basis of a stair sliding support, a shock insulation support and a vertical anchor bolt are arranged at the joint of a ladder section and a low-end ladder beam, the corrosion problem of a shear bolt steel bar exists, the function of limiting the ladder section to be detached is influenced, and the shock insulation support used by the limit device structure has the problems of rubber durability, high manufacturing cost and inconvenience for maintenance and replacement.
The Chinese utility model patent application "sliding support stair limiting device" (application number 201921528288.4, application date 2019.9.16) describes a sliding support stair limiting device, which comprises a spring inhaul cable, a limiting box and an anchor rod; one end of the spring inhaul cable is hinged with one end of the anchor rod, and the other end of the anchor rod is used for anchoring in the stair section; the other end of the spring inhaul cable penetrates through an opening in the upper end of the limiting box and is fixedly connected with the inner side of the limiting box, and the limiting box is used for being fixedly connected with the side face of the ladder beam. The outside of the lap joint of the ladder beam and the ladder section is provided with the tie rod and the spring limit box, and the main stress of the device caused by the dislocation of the stressed pull rod component and the stair sliding support is inconsistent, so that the performance advantage of the pull rod component cannot be fully exerted; the installation position of the external component has the hidden danger of collision damage of the tie rod and the ladder beam when an earthquake occurs and the problem of durability easily occurring in exposed air, and the exposed component influences the visual attractiveness of the building, is not suitable for indoor use and has a restricted application range.
In summary, the prior art has the following problems: the traditional sliding support is connected by inserting and anchoring reinforcing steel bars, and the main stress component is easy to corrode the reinforcing steel bars, so that the limiting effect is influenced; the rubber shock insulation support has high manufacturing cost and is difficult to detect and maintain in the later period, the structural size of a component at the position of the stair sliding support is required to be changed during installation and design, the node connection is complex, and the application range is restricted; some limiting devices installed outside the stair sliding support are complex in stress form, low in limiting efficiency and damaging the indoor attractiveness of the building.
Disclosure of Invention
The invention aims to provide a prefabricated staircase sliding support limiting device which is consistent in stress and sliding support deformation, good in integrity, good in durability, small in occupied space, high in strength and easy to maintain.
The technical solution for realizing the purpose of the invention is as follows:
a prefabricated staircase sliding support limiting device is used for limiting the relative sliding of a prefabricated concrete staircase and a staircase beam and comprises a tie rod 1 and an embedded steel pipe 2; the embedded steel pipe 2 is embedded at the lower part of the precast concrete stair platform, one end of the tie rod 1 is anchored in the stair beam, and the other end of the tie rod is sleeved in the embedded steel pipe 2; and the inner wall of the embedded steel pipe 2 is provided with a shrinkage limiting mechanism 21 for limiting the longitudinal shrinkage of the drawknot rod 1.
Compared with the prior art, the invention has the following remarkable advantages:
1. the whole stress performance of the device is good. The characteristic that the self sliding support of the precast concrete stair is isolated from vibration is utilized, safe relative sliding between the stair beam and the stair section is ensured, and the damage of the stair under earthquake force is effectively avoided; one end of the basalt fiber tie rod part is fixed in the ladder beam, the other end of the basalt fiber tie rod part can slide in the embedded steel tube along the axial direction, and when the relative displacement of the ladder beam and the ladder section reaches a limit value, anchorage devices at two ends of the basalt fiber tie rod part are clamped in the embedded steel tubes of the ladder beam and the ladder section to play a role in tie limiting, so that a sliding support of the stair is prevented from being disengaged; the stress direction of the tie rod is designed to be consistent with the dislocation direction of the stair sliding support, so that the device is good in integrity, the stress model is clear and reasonable, the tie effect of basalt fiber reinforcement materials is fully exerted, the material utilization rate is improved, the installation is convenient, and the component connection is more firm.
2. The device has good durability and low cost. The main stressed pull rod part is made of basalt fibers, and the basalt fibers have better durability and tensile strength than reinforcing steel bars, do not need special protection, and cannot generate the durability problems of corrosion, corrosion and the like in the actual use process; the device is pre-embedded to reduce the exposure of components, thereby avoiding the corrosion damage and the collision damage with other building components and reducing the manufacturing cost and the maintenance cost.
3. The occupied space is reduced, and the effect exertion of the sliding support is not influenced. Embedding the embedded steel pipe of the limiting device in concrete and reserving a reserved hole in the concrete in the early construction stage of precast concrete, so that the space occupation of the stairs is reduced; under the condition of earthquake, the stress direction of the tie rod device is consistent with the deformation of the stairs, so that the separation of the stairs is effectively limited and the shock insulation effect of the sliding support is not influenced; the built-in components are adopted, so that the device can be widely applied to buildings with high requirements on indoor visual effect.
4. The limiting box device transmits the pulling force through the steel pipe, plays a limiting and pulling role in the bench section, plugs the embedded steel pipe to reduce the exposure of the embedded steel pipe, prevents foreign matters from blocking a sliding channel in the steel pipe, is convenient to detach, and is convenient for daily maintenance and inspection.
The invention is described in further detail below with reference to the figures and the detailed description.
Drawings
FIG. 1 is a schematic view of the structure and installation of the prefabricated staircase slip support limiting device of the present invention;
FIG. 2 is a schematic view of the basalt fiber reinforcement and anchor of FIG. 1;
FIG. 3 is a cross-sectional view of the anchor of FIG. 2;
FIG. 4 is a schematic cross-sectional view of the embedded steel pipe shown in FIG. 1;
fig. 5 is a schematic view of the limiting box in fig. 1.
The device comprises a tie rod 1, basalt fiber reinforcement 11, a first anchor 12, a second anchor 13, an embedded steel pipe 2, a limiting box 3 and a rivet 31.
Detailed Description
As shown in figure 1, the prefabricated staircase sliding support limiting device is used for limiting the relative sliding of a prefabricated concrete staircase and a staircase beam and comprises a tie rod 1 and an embedded steel pipe 2;
the embedded steel pipe 2 is embedded at the lower part of the precast concrete stair platform, one end of the tie rod 1 is anchored in the stair beam, and the other end of the tie rod is sleeved in the embedded steel pipe 2;
and the inner wall of the embedded steel pipe 2 is provided with a shrinkage limiting mechanism 21 for limiting the longitudinal shrinkage of the drawknot rod 1.
Preferably, as shown in fig. 2, the tie bar 1 includes a first anchor 12 for anchoring in the ladder beam, a second anchor 13 for being sleeved in the embedded steel pipe 2 and matching with the shrinkage limiting mechanism 21, and a basalt fiber reinforcement 11 with two ends fixedly connected with the first anchor 12 and the second anchor 13 respectively.
The end of the first anchor 12 is provided with a radial protrusion 121.
The radial protrusions 121 are evenly distributed along the circumference of the end of the first anchor 12.
The end part of the second anchorage device 13 is provided with a radial protrusion 131, the inner wall of the embedded steel pipe 2 is inwards recessed by the shrinkage limiting mechanism 21, and the shrinkage limiting mechanism 21 is positioned on one side of the radial protrusion 131 close to the first anchorage device 12 and limits the drawknot rod 1 to shrink towards the first anchorage device 12.
As shown in fig. 1, the combined type stair is characterized by further comprising a limiting box 3, wherein the limiting box 3 is detachably fixed on the side surface of the lower portion of the stair step and is fixedly connected with the end portion of the embedded steel pipe 2 in a sealing mode.
The embedded steel pipe 2 is embedded at the lower part of the precast concrete stair section, one end of the embedded steel pipe 2 is flush with the lower part of the precast concrete stair section close to the side surface of the stair beam, and the other end of the embedded steel pipe 2 extends out of the side surface of the lower part of the stair section and is welded with the limiting box 3;
the limiting box 3 is used for plugging the embedded steel pipe 2, and the limiting box 3 is fixed on the side face of the lower part of the stair step.
By way of example, the basalt fiber rib material 11 has a length of 340mm and a diameter of 8mm, and is anchored at two ends in the first anchorage device 12 and the second anchorage device 13, wherein the anchoring length is 50 mm.
The external diameter of the anchoring opening of the first anchorage device 12 is 28mm, the internal diameter is 8mm, the depth is 55mm, the internal slope is 5 degrees, the external top end of the first anchorage device 12 is provided with an external diameter of 38mm and a width of 9mm, and the external part of the first anchorage device 12 is provided with a thread which can increase the anchoring force.
The external diameter of the anchoring opening of the second anchor device 13 is 28mm, the internal diameter is 8mm, the depth is 55mm, the internal slope is 5 degrees, the external top end of the second anchor device 13 is provided with an external diameter of 38mm and a width of 20mm, and the external diameter and the width of the external diameter are expanded to play a role in clamping and limiting the bench to slide and disengage with the embedded steel pipe 2.
As shown in FIG. 4, the inner diameter 1 of the embedded steel pipe 2 was 28mm, and the outer diameter 2 was 38 mm.
And the second anchorage device 13 of the tie rod 1 is sleeved in the embedded steel pipe 2.
As shown in fig. 5, the limiting box 3 is in a triangular prism shape, the length of the bottom right-angle side is 130mm, the length of the side right-angle side is 88mm, the width of the side right-angle side is 110mm, and the limiting box 3 is provided with holes with the same diameter as the embedded steel pipe 2.
The 50mm width of rib is added to 3 both sides of spacing box, and spacing box 3 wholly adopts high strength steel, and thickness is 10 mm.
The limiting box 3 is sleeved at one end of the embedded steel pipe 2 extending out of the lower portion of the bench, and ribbed plates on two sides of the limiting box 3 are connected to the lower portion of the bench in an anchoring mode through rivets 31.
The embedded steel pipe 2 and the limiting box 3 are welded, and the holes of the embedded steel pipe 2 are sealed by welding steel plates with the caliber size of the embedded steel pipe 2, so that foreign matters are prevented from entering and blocking a sliding channel, and meanwhile, the inside of the embedded steel pipe 2 is prevented from being rusted.
The working principle of the invention is briefly described as follows:
as shown in figures 1-5, the sliding support of the precast concrete stair releases earthquake force mainly by horizontal unidirectional dislocation of the ladder sections and the ladder beams under the condition of earthquake. The position of the drawknot rod 1 which plays a drawknot restriction role is designed to be consistent with the deformation direction of the stair sliding support, under a normal use state, the drawknot rod 1 is in a tension-compression stress-free state, one anchorage device at two ends is fixed in the ladder beam, and one anchorage device can slide in the embedded steel pipe 2. Under the action of earthquake force, slippage and dislocation are generated between the slippage support stair and the stair boards, if the stair section at the moment has the outward tendency of disengaging from the stair beam and exceeds the slippage limit by 50mm, the outer expanding end of the second anchorage device 13 is clamped with the embedded steel pipe 2 due to the fact that the inner diameter of the steel pipe is reduced, the basalt fiber rib material 11 is pulled, and the other end of the drawknot rod 1 is anchored in the stair beam, so that the disengagement danger of the stair section is limited. When the ladder section has dislocation and has a tendency of collision with the ladder beam, the second anchorage device 13 in the embedded steel pipe 2 has reverse sliding without obstacles and does not generate pressure on the basalt fiber reinforcement 1 because the distance between the ladder section and the ladder beam is 50mm and the flexible polystyrene board is filled.
The limiting devices are embedded in the ladder sections and the ladder beams, so that a series of corrosion problems caused by air exposure are avoided, and the ladder is more attractive in building installation angle; by analyzing the stress condition of the sliding support of the stair in rare earthquakes and designing the installation position of the tie rod 1 on the relative sliding line of the stair beam ladder section, the stress model is more reasonable, the advantage of high tensile strength of the basalt fiber reinforcement material 11 is fully exerted, and the material utilization rate is improved; the tie rod 1 slides and is tied in the embedded steel pipe 2, so that the device is prevented from colliding with other building components in the working process; the embedded steel pipe of 3 shutoff of spacing box 2 can prevent on the one hand that the foreign matter from getting into sliding channel, prevents embedded steel pipe 2 and air contact corrosion to the later maintenance of being convenient for overhauls, spacing box 3 of on the other hand plays fixed embedded steel pipe 2 and is not pulled out the effect of concrete.
The construction method of the prefabricated staircase sliding support limiting device comprises the following steps:
a, positioning a reserved hole in a ladder beam before pouring concrete on the ladder beam and the ladder section of the prefabricated staircase, wherein the center of the reserved hole is 110mm away from the top surface of the ladder beam, the depth is 145mm, the opening groove aperture is 46mm, positioning and embedding an embedded steel pipe 2 below the ladder section, the embedded distance from the center of the embedded steel pipe 2 to the top surface of a ladder section platform is 110mm, and the reserved hole of the ladder beam corresponds to the embedded steel pipe 2 in positioning to form a linear sliding channel;
b, anchoring the two ends of the basalt fiber reinforcement material 11 with a first anchorage device 12 and a second anchorage device 13 by using epoxy resin, and performing subsequent installation after the anchoring adhesive is solidified;
c, before the prefabricated staircase is hoisted, the basalt fiber reinforcement 11 penetrates through the embedded steel pipe 2 pre-embedded in the ladder section, and the first anchorage 12 penetrates out from one end, close to the ladder beam, of the ladder section;
d, fixing a 5 mm-thick polytetrafluoroethylene plate with the same size as the platform surface of the ladder beam by flat-headed rivets to manufacture a sliding support;
e, keeping the center of the embedded steel pipe 2 and the center of the reserved hole of the ladder beam in a straight line consistent when the prefabricated staircase is hoisted, and removing sundries and dust in the embedded steel pipe 2 and the reserved hole;
f, anchoring the first anchorage devices 12 of the basalt fiber reinforcement materials 11 in the reserved holes of the ladder beams through cementing agents, and in the anchoring process, the anchoring depth of the first anchorage devices 12 and the distance between the ladder beams of the ladder sections are accurately installed according to a pre-calculated value so as to ensure that slippage displacement is reserved;
g, sleeving the limiting box 3 at the end of the embedded steel pipe 2 extending out of the lower part of the bench, and anchoring the ribbed plates on the two sides of the limiting box 3 to the lower part of the bench through rivets 31;
h, after removing impurities in the embedded steel pipe 2, welding the embedded steel pipe 2 and the limiting box 3, and welding and plugging the hole of the embedded steel pipe 2 by using a steel plate with the same caliber size as the embedded steel pipe 2;
i, sealing and filling 50mm intervals between the stair beam and the stair sections by adopting a polystyrene board flexible material.
Claims (6)
1. The utility model provides a prefabricated staircase support stop device that slides for the relative of restriction precast concrete stair and ladder beam slides, its characterized in that:
comprises a tie rod (1) and an embedded steel pipe (2);
the embedded steel pipe (2) is embedded at the lower part of the precast concrete stair platform, one end of the tie rod (1) is anchored in the stair beam, and the other end of the tie rod is sleeved in the embedded steel pipe (2);
the inner wall of the embedded steel pipe (2) is provided with a shrinkage limiting mechanism (21) for limiting the longitudinal shrinkage of the tie rod (1).
2. The spacing device of claim 1, wherein:
the tie rod (1) comprises a first anchorage device (12) for anchoring in the ladder beam, a second anchorage device (13) for being sleeved in the embedded steel pipe (2) and matched with the shrinkage limiting mechanism (21), and basalt fiber reinforcement materials (11) of which two ends are fixedly connected with the first anchorage device (12) and the second anchorage device (13) respectively.
3. The spacing device of claim 2, wherein:
the end part of the first anchorage device (12) is provided with a radial protrusion (121).
4. A spacing device according to claim 3, characterized in that:
the radial protrusions (121) are uniformly distributed along the circumferential direction of the end part of the first anchor (12).
5. The spacing device of claim 2, wherein:
the end part of the second anchor (13) is provided with a radial protrusion (131), the inner wall of the embedded steel pipe (2) is inwards recessed as the shrinkage limiting mechanism (21), the shrinkage limiting mechanism (21) is positioned on one side, close to the first anchor (12), of the radial protrusion (131), and the drawknot rod (1) is limited to shrink towards the direction of the first anchor (12).
6. A spacing device according to any one of claims 1 to 5, wherein:
the limiting box (3) is detachably fixed on the side face of the lower part of the stair step section and is fixedly connected with the end part of the embedded steel pipe (2) in a sealing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080233.6A CN110748102A (en) | 2019-11-07 | 2019-11-07 | Prefabricated staircase support stop device that slides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080233.6A CN110748102A (en) | 2019-11-07 | 2019-11-07 | Prefabricated staircase support stop device that slides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110748102A true CN110748102A (en) | 2020-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911080233.6A Pending CN110748102A (en) | 2019-11-07 | 2019-11-07 | Prefabricated staircase support stop device that slides |
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| CN (1) | CN110748102A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738037A (en) * | 2021-08-27 | 2021-12-03 | 无锡地铁建设有限责任公司 | Vertical limit structure of slip end of assembled stair |
-
2019
- 2019-11-07 CN CN201911080233.6A patent/CN110748102A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738037A (en) * | 2021-08-27 | 2021-12-03 | 无锡地铁建设有限责任公司 | Vertical limit structure of slip end of assembled stair |
| CN113738037B (en) * | 2021-08-27 | 2023-09-01 | 中铁四局集团有限公司 | Vertical limit structure of sliding end of assembled stair |
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