Component for punching-resistant reinforcement
By using the steel tic-tie system as a component for impinge-cut reinforcement, the problems of long construction cycles of traditional foundation reinforcement and major damage to the original components are solved, and the construction is fast and the shear bearing capacity is improved.
Patent Information
- Application Number
- CN202422134856.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The traditional foundation reinforcement practice has a long construction cycle and a large formwork project volume. The original foundation is exposed for a long time after excavation of the foundation pit, which has high requirements for the construction of the tendons and has great damage to the original components during the tendons.
A steel tic-tread system is used as a component for impinge-cut reinforcement. By strengthening the combination of steel plates, fixed angle steel, connecting bolts, bolts and concrete column piers, a system with good integrity is formed, which simplifies the construction process and reduces the damage to the original component.
It shortens the construction cycle, reduces the amount of formwork, reduces the damage to the original foundation, improves the shear bearing capacity, and is suitable for scenarios such as independent foundations and rafts.
Smart Images
Figure CN223034090U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of foundation reinforcement, and particularly relates to a component for punching shear reinforcement. Background Technique
[0002] In industrial buildings and civil buildings, with the change of building use functions, such as adding floors, replacing or adding equipment, changing floor use conditions, etc., it may cause an increase in the axial force at the bottom of the column, resulting in an increase in the shear force received by the column bottom foundation. The strength of the original foundation section cannot meet the bearing requirements, and at this time, the foundation needs to be reinforced.
[0003] Traditional foundation reinforcement methods include methods such as increasing the cross-sectional area method, rib beam reinforcement method, changing independent foundation to strip foundation, raft foundation, etc. The above reinforcement methods all require implanting steel bars in the original foundation and columns. Taking the bottom steel bars as an example, their stress form is mainly tensile, and higher requirements are imposed on the implanting depth of the steel bars. Therefore, the disadvantages of traditional foundation reinforcement methods are long construction period, large formwork engineering quantity, long-term exposure of the original foundation after foundation pit excavation, high requirements for steel bar implanting construction, and large damage to the original components during the drilling construction of steel bar implanting.
[0004] For this reason, this application proposes a cross-shaped frame system method for punching shear reinforcement of independent foundation or raft foundation, using a steel cross-shaped frame as the skeleton to build a column pier system to improve the shear bearing capacity of structural components. This cross-shaped frame system method has a high degree of modularization and fast construction, and can meet the design requirements of safety, economy and rationality.
[0005] The information disclosed in this background technical part is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Content of the Utility Model
[0006] The purpose of the utility model is to provide a component for punching shear reinforcement to solve the problems of long construction period, large formwork engineering quantity, long-term exposure of the original foundation after foundation pit excavation, high requirements for steel bar implanting construction, and large damage to the original components during the drilling construction of steel bar implanting in traditional foundation reinforcement methods.
[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0008] A component for punching shear reinforcement, comprising:
[0009] Reinforcing steel plates, on which 2 symmetric butt slits are opened, and are butt-jointed through the butt slits to be arranged in a "cross" shape; a plurality of stud connection holes are opened in the middle of the reinforcing steel plates, and a plurality of bolt connection holes are opened on both sides of the butt slits;
[0010] Fixed angle steel, four pieces are arranged at the intersection of two intersecting reinforcing steel plates, and a plurality of bolt connection holes are opened thereon;
[0011] Connecting bolts pass through the bolt connection holes on both sides of the docking slot and the corresponding fixed angle steel, and are fixed by nuts so that the fixed angle steel clamps the reinforcing steel plate;
[0012] Studs are inserted into the stud connection holes, and one end thereof is implanted into the original structural column;
[0013] The concrete pier is in a rectangular structure and wraps each of the reinforcing steel plates arranged in a "well" shape.
[0014] Preferably, the interior of the concrete pier is provided with concealed beam longitudinal reinforcement bars, concealed beam stirrups and concealed beam structural reinforcement bars, all of which are made of HRB400 steel bars.
[0015] Preferably, both the reinforcing steel plate and the fixed angle steel are made of Q355B steel; the height of the fixed angle steel is the same as the height of the reinforcing steel plate.
[0016] Preferably, the design shear strength value of the stud is not less than 310 .
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] (1) For the component for punching shear reinforcement of the utility model, the reinforcing steel plates are butt-jointed to form a "well" - shaped frame system, which is convenient and fast to construct, and the time for underground engineering is short; the reinforcing steel plates are connected by upper and lower grooved buckles and bolt connections with fixed angle steel, and are matched with shear - torsion bolts, so the on - site installation speed is fast and the construction quality is easy to control.
[0019] (2) For the component for punching shear reinforcement of the utility model, the concealed beam stirrups can be sleeved on the reinforcing steel plate and then installed as a whole, and then the concealed beam longitudinal reinforcement bars and concealed beam structural reinforcement bars are inserted. The construction is convenient; at the same time, the reinforcing steel plate can be used to weld and fix the lateral formwork and the positioning and fixing devices for binding stirrups, which is beneficial to reducing the workload of the steel bar project and the formwork project, and makes the work process more modular and standardized, and is easy to operate on site.
[0020] (3) For the component for punching shear reinforcement of the utility model, when implanting studs on the column side in the rebar implanting project, it is not necessary to excavate the entire foundation, which can reduce the exposure time of the foundation pit to a certain extent, and is beneficial to reducing the damage to structural components caused by factors such as foundation pit flooding.
[0021] (4) The component for punching shear reinforcement of the present utility model does not require drilling and implanting rebars on the foundation surface and the column side surface simultaneously. Only the stud on the column side needs to be implanted, which causes less damage to the original foundation component. At the same time, since the main function of the stud is to transfer shear force and not to be in tension, the implantation depth requirement of the stud is also smaller than that of the tension reinforcement. It only needs to meet the local compression and shear of the stud and the concrete, which can greatly reduce the damage to the original structural concrete.
[0022] (5) The component for punching shear reinforcement of the present utility model has good integrity of the system. It can not only be used for improving the shear bearing capacity of the column punching the foundation / raft on the independent foundation and raft, and the upper step foundation punching the lower step foundation, but also be used for increasing the bottom area of the foundation and cooperating with the steel beam strip foundation system to improve the bearing capacity of the foundation for the bending moment and axial force of the upper structure, with a wide application range. Brief Description of the Drawings
[0023] Figure 1 is the axonometric view of the relationship between the cross-shaped frame and the foundation of the present utility model;
[0024] Figure 2 is the sectional view of the relationship between the cross-shaped frame and the foundation of the present utility model;
[0025] Figure 3 is the top view of the cross-shaped frame of the present utility model;
[0026] Figure 4 is the axonometric view of the cross-shaped frame of the present utility model;
[0027] Figure 5 is the installation schematic diagram of the steel structure of the cross-shaped frame of the present utility model;
[0028] Figure 6 is the schematic diagram of the reinforcing steel plate of the present utility model;
[0029] Figure 7 is the schematic diagram of the fixed angle steel of the present utility model;
[0030] Main Reference Numeral Description:
[0031] 1. Reinforcing steel plate; 2. Fixed angle steel; 3. Connecting bolt; 4. Stud; 5. Concrete pier; 6. Longitudinal bar of the concealed beam; 7. Stirrup of the concealed beam; 8. Structural bar of the concealed beam; 9. Docking slot; 10. Stud connection hole; 11. Bolt connection hole. Detailed Embodiment
[0032] The technical solution of the utility model patent will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the utility model without creative work belong to the scope of protection of the utility model.
[0033] In the description of the present utility model, it should be noted that terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the utility model.
[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the connection inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0035] Referring to the attached Figure 1-7 , a member for punching shear reinforcement includes: a reinforcing steel plate 1, a fixed angle steel 2, connecting bolts 3, stud bolts 4, and a concrete pier 5. Among them, the concrete pier 5 includes longitudinal bars 6 of the hidden beam, stirrups 7 of the hidden beam, and structural bars 8 of the hidden beam. A plurality of stud bolt connection holes 10 are formed in the middle of the reinforcing steel plate 1, and a plurality of bolt connection holes 11 are formed on both sides of the butt joint grooving 9. A plurality of bolt connection holes 11 are also formed on the fixed angle steel 2.
[0036] In this embodiment, the reinforcing steel plates 1 are arranged in a "well" shape and are disposed around the members generating shear forces, such as columns and the upper foundation of a multi-step independent foundation. As the main load-bearing member, the reinforcing steel plate 1 bears the shear force transmitted by the stud bolts 4 and can also be used to fix the stirrups 7 of the concrete hidden beam and the formwork of the concrete pier 5. The reinforcing steel plates 1 in two directions are buckled into a whole through the upper and lower butt joint groovings 9. The size of the steel plate is determined by bearing capacity calculation according to the load of the upper structure and the dimensions of the original structural members.
[0037] Before the casting of the concrete pier 5, mortar pads are used to elevate the strengthening steel plate 1 above the top surface of the underlying foundation to ensure that there is at least 50 mm thick concrete protective layer between the bottom of the steel plate and the top surface of the foundation. The designed spacing of the concealed beam stirrups 7 of the concrete pier 5 is not greater than 100 mm. Before the fastening of the strengthening steel plate 1, a sufficient number of concealed beam stirrups 7 can be pre-sleeved onto the strengthening steel plate 1, so that after fastening, the concealed beam stirrups 7 can be positioned and tied and fixed by the fixing parts welded on the strengthening steel plate 1.
[0038] The fixing angle steel 2 is used to fix the strengthening steel plate 1 and is an important connecting component. Four pieces of fixing angle steel 2 are arranged at the intersection of the strengthening steel plates 1 in two directions of the "well" - shaped layout, and the strengthening steel plates 1 are clamped by high - strength bearing - type connecting bolts 3, so that the four strengthening steel plates 1 form a system with very good integrity. The height of the fixing angle steel 2 is the same as that of the strengthening steel plate 1 and can be cut from equal - angle steel. Within the contact area between the fixing angle steel 2 and the strengthening steel plate 1, both the fixing angle steel 2 and the strengthening steel plate 1 are required to be shot - blasted and sand - blasted, and the anti - slip coefficient μ after treatment is required to be not less than 0.40. The model size of the fixing angle steel 2 is calculated and selected according to the bearing capacity requirements and structural requirements of the friction - type high - strength bolts at this joint.
[0039] The strengthening steel plate 1 and the fixing angle steel 2 can be made of Q355B steel, and the position and size of the strengthening steel plate 1 can be flexibly adjusted according to the magnitude of the upper - structure load and the size of the original structural members. The height of the fixing angle steel 2 is the same as the height of the strengthening steel plate 1.
[0040] The connecting bolt 3 is required to be a high - strength bolt of grade 10.9s, and the stud 4 is also required to have a shear strength design value not less than 310 . The above components are mainly used for anti - shear, and the number of bolts can be arranged through the bolt shear - force calculation formula (Formula 7.2.2 - 1 of the "Standard for Design of Steel Structures"). At least one row of two - row bolt connection holes 11 need to be set on the fixing angle steel 2.
[0041] The stud 4, as an important force - transfer component, is responsible for converting part of the vertical force of the upper component into the "well" - shaped truss system. The number of studs 4 is determined through calculation according to the magnitude of the upper load, and the arrangement position of the studs 4 also needs to fully consider the reinforcement arrangement position of the original structural column to avoid the situation where the studs 4 collide with the reinforcement of the original structural column.
[0042] The concrete column pier 5, as a reinforced concrete member, is used to jointly bear the shear force of the upper structure with the reinforcing steel plate 1. The longitudinal bars 6 of the concealed beam and the stirrups 7 of the concealed beam are both stress-bearing bars, while the structural bars 8 of the concealed beam play a role in preventing local cracking of the member. The concrete strength grade of the concrete column pier 5 is one grade higher than that of the original foundation concrete, and the steel bars of the column pier adopt steel bars with the grade of HRB400. Among them, the longitudinal bars 6 of the concrete concealed beam and the stirrups 7 of the concealed beam are both determined according to calculations. The selected diameter of the longitudinal bars 6 of the concealed beam is not less than 16 mm, the selected diameter of the stirrups 7 of the concealed beam and the structural bars 8 of the concealed beam is not less than 12 mm, the spacing of the stirrups 7 of the concealed beam is 100 mm, and the spacing of the structural bars 8 of the concealed beam is 200 mm.
[0043] The member for punching shear reinforcement of the present utility model can effectively solve the problems of long construction period, high difficulty, high risk, etc. in the traditional foundation reinforcement method, avoid the long-term exposure of the original foundation after the foundation pit excavation, and the damage to the original member during the drilling construction for implanting steel bars is relatively small. It is very practical and has a good market application prospect.
[0044] The foregoing description of the specific exemplary embodiments of the present utility model is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present utility model to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present utility model and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present utility model, as well as various different selections and changes. The scope of the present utility model is intended to be defined by the claims and their equivalents.
Claims
1. A component for punching shear reinforcement, characterized in that: include: The reinforcing steel plate is provided with two symmetrical butt joint grooves, and the butt joint grooves are connected to each other in a "well" shape; a plurality of bolt connection holes are provided in the middle of the reinforcing steel plate, and a plurality of bolt connection holes are provided on both sides of the butt joint grooves; Fixed angle steels, 4 of which are arranged at the intersection of the two intersecting reinforcing steel plates, and on which a plurality of bolt connection holes are provided; The connecting bolts pass through the bolt connection holes on both sides of the butt slot and the corresponding fixing angle steels, and are fixed by nuts; A bolt inserted into the bolt connection hole; The concrete column pier wraps each of the reinforcing steel plates arranged in a "well" shape.
2. The member for punching shear reinforcement according to claim 1, characterized in that: The concrete pier is provided with hidden beam longitudinal reinforcement, hidden beam stirrups and hidden beam structural reinforcement, all of which are made of HRB400 reinforcement.
3. The member for punching shear reinforcement according to claim 1, characterized in that: The reinforcing steel plate and the fixed angle steel are both made of Q355B steel; the height of the fixed angle steel is the same as that of the reinforcing steel plate.
4. The member for punching shear reinforcement according to claim 1, characterized in that: The design value of the stud shear strength Not less than 310 .