Combined hoop suitable for square pier column

Abstract

The utility model discloses a combined hoop suitable for a square pier column, which comprises two groups of symmetrically arranged semi-square hoops, a flange arranged at the butt joint of the semi-square hoops, a high-strength bolt penetrating through the flange to connect the two groups of symmetrically arranged semi-square hoops into a whole, and a rubber cushion block sleeved on the square pier column, the square pier column is separated from the two sets of semi-square hoops through the rubber cushion blocks. The semi-square hoop comprises an inner base plate attached to the rubber pad, a face plate arranged on the outer side of the inner base plate and a force transmission structure arranged between the inner base plate and the face plate, and the force transmission structure transmits pre-tightening force applied to the face plate to the inner base plate and then transmits the pre-tightening force to the concrete main stress face of the square pier column. The combined hoop is suitable for the square high pier column, holes do not need to be reserved in the pier column, steel plates do not need to be embedded in the pier column, high supports do not need to be erected, foundation treatment does not need to be conducted, and the problem that a common square hoop cannot provide enough friction force due to the fact that the positive pressure of the main stress face between the common square hoop and the pier column is insufficient can be solved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model belongs to the technical field of hoop, more particularly relates to a kind of square pier column combination hoop suitable for. BACKGROUND

[0002] Due to the need of high-quality and high-quality construction, many projects do not allow pre-burying steel plate and reserving hole on pier column during bent cap construction, and do not allow welding bracket for support, only construction method without influence on appearance of pier column can be used.If steel rod support method is used to reserve round hole for inserting steel rod, some projects also stipulate that the diameter of reserved hole should not be greater than 10cm, and the steel rod that can be inserted is too small to meet the requirement of stress;If traditional full-support support construction method is used, but some bridges are located in soft soil foundation, and the pier column is high, up to 20m, full-support support needs to be set up, and foundation treatment also needs to be done, which is time-consuming and laborious.

[0003] Cylindrical pier often uses hoop construction method, engineering construction personnel designs square pier column hoop support method for bent cap construction by referring to circular pier column, and through investigation, current square pier column hoop intellectual property rights include but are not limited to: a hoop for lifting square prefabricated pier column (application number CN202023249295.6), a hoop device and support for polygonal pier column (application number CN202220434047.9) and the like, as shown in the previous square pier column hoop Figure 1 The above hoop form is not ideal in actual use effect, and unlike circular hoop form, traditional square hoop cannot effectively convert pre-tightening load into normal stress between hoop and concrete, so as to provide sufficient friction.

[0004] Therefore, at present, a square pier column combination hoop suitable for is needed, which can effectively convert hoop pre-tightening force into normal stress between hoop and concrete by optimizing square hoop form, so as to greatly improve friction. SUMMARY

[0005] In view of the problems that the square hoop of prior art cannot effectively convert pre-tightening load into normal stress between hoop and concrete, so as to provide sufficient friction, the utility model provides a square pier column combination hoop suitable for to solve such problems.

[0006] In order to achieve the above purpose, the utility model provides a square pier column combination hoop suitable for, which comprises symmetrically arranged half-square hoops, and a certain gap is left between two groups of half-square hoops;The half-square hoop comprises a panel, an inner gusset plate and a force transmission structure;A flange is arranged at the butt joint of the half-square hoop;High-strength bolts are used to connect two groups of symmetrically arranged half-square hoops into one body through the flange;And a rubber pad is sleeved on the square pier column, which separates the square pier column from the two groups of half-square hoops.

[0007] Further, the force transmission structure comprises an I-beam and a channel steel.

[0008] Further, the I-beam is provided with a plurality of groups, and the two ends thereof are fixedly connected with the panel and the inner gusset plate respectively by welding; the channel steel is located at the bending position of the panel, and the channel thereof faces inward, and the two ends thereof are fixedly connected with the panel and the inner gusset plate respectively by welding.

[0009] Further, the structure further comprises a reinforcing structure, and the reinforcing structure comprises a trapezoidal rib plate and a ring rib plate.

[0010] Further, the trapezoidal rib plate is arranged at the bending position of the panel, and the top and bottom thereof are fixedly connected with the panel and the inner gusset plate respectively, the right-angle waist is fixedly connected with the channel steel, and the oblique waist is fixedly connected with the bending edge of the panel; the ring rib plate is provided with a plurality of groups, and the plurality of groups of the ring rib plate are fixedly arranged on the outer side of the panel in parallel and in a ring shape.

[0011] Further, the flange is a plate structure, is fixedly arranged at the bottom of the half-square hoop by welding, a plurality of connecting holes are formed in the flange, and the high-strength bolts are locked with the nuts after penetrating through the connecting holes to lock the two groups of half-square hoops.

[0012] Further, a plurality of reinforcing rib plates are further fixedly arranged between the flange and the half-square hoop.

[0013] Overall, compared with the prior art, the above technical scheme conceived by the utility model can achieve the following beneficial effects:

[0014] (1) The combined hoop of the utility model is composed of an I-beam and a channel steel to form a force transmission structure, the panel and the inner gusset plate are connected through the force transmission structure, the pre-tightening force applied to the panel is transmitted to the inner gusset plate through the force transmission structure, and then is transmitted to the main stress surface of the square pier concrete, so that the pre-tightening force of the hoop can be effectively converted into the normal stress between the hoop and the concrete, thereby greatly improving the friction.

[0015] (2) The combined hoop of the utility model is suitable for the pier cap beam construction of a square high pier (because the cost of erecting a support is high, and the safety risk is great), a low bearing capacity of a foundation (because if a support is erected, the foundation needs to be treated, and the construction cost is increased), and a high quality appearance requirement (a through bar and a pre-buried bracket are not allowed), and does not need to reserve a hole in the pier, does not need to pre-bury a steel plate in the pier, does not need to erect a high support and treat a foundation, and can also avoid the problem that the ordinary square hoop cannot provide sufficient friction due to insufficient normal pressure of the main stress surface between the ordinary square hoop and the pier. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the square pier hoop in the prior art;

[0017] Figure 2The utility model discloses a structure schematic view of square pier column combined hoop in the embodiment of the utility model;

[0018] Figure 3 It is a side view of square pier column combined hoop in the embodiment of the utility model;

[0019] Figure 4 It is a structure schematic view of half square hoop and flange in the embodiment of the utility model;

[0020] Figure 5 It is a hoop load force schematic view in the embodiment of the utility model;

[0021] Figure 6 It is a multilayer hoop layout schematic view in the embodiment of the utility model.

[0022] In all drawings, same reference signs represent same technical features, specifically: 1-half square hoop, 101-panel, 102-inner batten, 103-I beam, 104-channel steel, 105-trapezoidal rib plate, 106-ring rib plate, 2-flange, 3-high strength bolt, 4-rubber pad, 5-reinforcing rib plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with the drawings and embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] For example, Figures 2-6As shown in the utility model provides a kind of suitable for square pier column combination hoop, it includes two groups of symmetrically arranged half-square hoop 1, flange 2 being arranged at the butt joint of half-square hoop 1, high-strength bolt 3 passing through flange 2 and being connected as a whole with two groups of symmetrically arranged half-square hoop 1, and rubber pad 4 being sleeved on square pier column, which separates square pier column and two groups of half-square hoop 1.The half-square hoop 1 includes inner pad 102 that is attached to rubber pad 4, panel 101 being arranged on the outer side of inner pad 102, and force transmission structure being arranged between inner pad 102 and panel 101, which transmits the pre-tightening force applied to panel 101 to inner pad 102, and then to the main stress surface of square pier column concrete.The combination hoop of the utility model is suitable for square high pier column (because high pier column has high cost and great safety risk for setting support), low bearing capacity of foundation (because if support is set, foundation treatment is needed, which increases construction cost), high quality appearance requirement (not allowed to make through bar and pre-buried bracket) of pier beam construction, which does not need to reserve hole in pier, does not need to pre-bury steel plate in pier, does not need to set high support and foundation treatment, and can also avoid the problem that ordinary square hoop cannot provide sufficient friction due to insufficient normal stress between main stress surface and pier.

[0025] As Figure 2 shown in the embodiment of the utility model, two groups of symmetrically arranged half-square hoop 1 are tightened around square pier, and a certain gap is left between them to ensure that, after being connected by flange 2 and high-strength bolt 3, steel hoop can be tightly pressed against pier.

[0026] The half-square hoop 1 includes panel 101, inner pad 102 and force transmission structure.

[0027] Among them, panel 101 arranged on the outer side should have sufficient rigidity to avoid creep effect under the action of long-term pre-tightening force, which leads to pre-tightening force loss and reduces the carrying capacity of hoop.

[0028] Inner pad 102 arranged on the inner side plays the role of load transmission, and is flat and has large bending stiffness, so as to ensure that the main stress surface of square pier is uniformly stressed.

[0029] The force transmission structure is used for transmitting the pre-tightening force applied to the face plate 101 to the inner backing plate 102, and then to the square pier concrete main stress surface, which comprises I-beams 103 and channel steels 104, the I-beams 103 are provided with multiple groups, and the two ends are fixedly connected with the face plate 101 and the inner backing plate 102 respectively by welding. The channel steel 104 is located at the bending position of the face plate 101, the slot of the channel steel 104 is inward, and the two ends are fixedly connected with the face plate 101 and the inner backing plate 102 respectively by welding; by arranging the channel steel 104 at the bending position of the half-square hoop 1, more pre-tightening force can be transmitted to the pier main stress surface, and the problem that the pre-tightening force increases, the pressure stress between the hoop and the pier stress surface does not increase synchronously, more stress is transmitted to the pier chamfer, effective friction cannot be formed, and thus the formwork is prone to slip is avoided.

[0030] Preferably, the force transmission structure further comprises a steel rib plate, which is matched with the I-beam 103 or the channel steel 104 to form a force transmission structure of a combined hoop, so that the invalid load sharing of the pier chamfer and the secondary stress surface is avoided, and the pre-tightening force is fully converted into normal stress of the pier main stress surface.

[0031] Further, in order to enhance the structural strength of the half-square hoop 1 to resist the creep effect under the action of long-time pre-tightening force, the half-square hoop 1 further comprises a reinforcing structure, the reinforcing structure comprises a trapezoidal rib plate 105 and a ring rib plate 106; the trapezoidal rib plate 105 is arranged at the bending position of the face plate 101, the top and bottom parts are fixedly connected with the face plate 101 and the inner backing plate 102 respectively, the right-angle waist is fixedly connected with the channel steel 104, and the inclined waist is fixedly connected with the bending edge of the face plate 101; the ring rib plate 106 is provided with multiple groups and is fixedly arranged on the outer side of the face plate 101 in parallel and in a ring shape.

[0032] As shown in the utility model embodiment, Figures 3-4 the flange 2 is fixedly arranged at the bottom of the half-square hoop 1 in a plate-shaped structure by welding, a plurality of connecting holes are formed in the flange 2, and the high-strength bolt 3 is locked with the nut after penetrating through the connecting holes to lock the two groups of half-square hoops 1.

[0033] Further, in order to enhance the connection strength of the flange 2 and the half-square hoop 1 and avoid stress deformation during locking, a plurality of reinforcing rib plates 5 are fixedly arranged between the flange 2 and the half-square hoop 1.

[0034] As shown in the utility model embodiment, Figure 5 the pre-tightening force tension calculation formula of the hoop load stress is as follows:

[0035] Supposing that all external loads such as the upper cap beam reinforcement, concrete, formwork, I-beam, pedestrian and the like are all borne by the two main stress surfaces, and the secondary stress surface in the direction perpendicular to the main stress surface does not share the load, the pre-tightening force P calculation formula of the hoop is as follows: according to the force balance condition, it can be known that:

[0036]

[0037] Then:

[0038]

[0039] The high-strength bolt torque calculation formula is:

[0040]

[0041] That is:

[0042]

[0043] In the formula: K--safety factor, preferably 1.2~1.3;

[0044] G--the weight of the half-square hoop;

[0045] F--all external loads such as upper cap beam reinforcement, concrete, formwork, I-beam, pedestrians, etc.;

[0046] μ--the friction coefficient between the arc-shaped clamping plate and the concrete interface;

[0047] n--the number of high-strength bolts;

[0048] N--the weight of the same pier column under the cap beam;

[0049] M--the torque applied by the high-strength bolt;

[0050] k M --the torque coefficient of the high-strength bolt;

[0051] d--the diameter of the high-strength bolt.

[0052] In the embodiment of the utility model, the construction process of the combined hoop comprises:

[0053] S100: after the concrete strength of the pier column reaches the design requirement, the hoop is installed; the installation elevation and position of the hoop are measured in advance on the surface of the pier column, the contact surface between the hoop and the concrete is ensured to be clean and flat, and oil or curing film should not be applied.

[0054] S200: the pair of hoops are installed on the pier column, 2-3mm rubber pads 4 are added between the main stress surface of the hoop and the pier column to increase the friction between the hoop and the pier column; rubber pads 4 are added between the panel 101 and the secondary stress surface to avoid damaging the appearance quality of the concrete when the high-strength bolt 3 is tightened;

[0055] S300: the tightening should be divided into initial tightening and final tightening. To prevent omission, different colors should be used to mark the nuts after the initial tightening or re-tightening of the high-strength bolt 3. The initial tightening should reach about 50% of the standard value of the bolt pre-tension; after the final tightening, the actual measured pre-tension value of each bolt of the test specimen should be between 0.95P and 1.05P (P is the designed pre-tension value of the high-strength bolt);

[0056] S400: the high-strength bolt 3 should be tightened strictly according to the sequence to avoid problems such as bolt loosening and structure deformation caused by incorrect tightening sequence; the flanges 2 on both sides should be tightened synchronously, and the tightening sequence should be consistent. The tightening sequence starts from the center of the structure and is symmetrically tightened from the inside to the outside and from the center to the two sides. After the final tightening, the torque values of all the bolts should be detected one by one to ensure that they are not lower than the designed torque requirement;

[0057] S500: before formal use, the bearing capacity test of the hoop should be carried out. The applied load should be not less than the designed bearing capacity, and a certain safety factor should be considered. The bearing capacity test of the hoop should be carried out on the test pier column. Two hydraulic jacks should be used to synchronously lift and load. During the process, the relative sliding between the hoop and the pier column and the deformation of the hoop should be observed. If neither of the above two conditions occurs or the sliding and deformation of the hoop are very small, the bearing capacity of the hoop meets the construction requirements. Otherwise, the hoop should be redesigned to increase the bearing capacity to ensure construction safety.

[0058] S600: if the bearing capacity of the hoop on one layer is insufficient, two or more layers of hoop support systems can be set according to the external load conditions. The adjacent two layers of hoops are arranged orthogonally. When the multi-layer hoop system is installed, the lower hoop should be installed first, and then the upper hoop is installed one by one to ensure that the adjacent hoops are in close contact without gaps, and each hoop plays a bearing role. The multi-layer hoop support system is shown in Figure 6 .

[0059] The combined hoop of the utility model, through the force transmission structure composed of I-beams 103 and channel steels 104, the face plate 101 and the inner gusset plate 102 are connected through the force transmission structure, the pre-tightening force applied on the face plate 101 is transmitted to the inner gusset plate through the force transmission structure, and then is transmitted to the square pier column concrete main stress surface, so that the hoop pre-tightening force can be effectively converted into the normal stress between the hoop and the concrete, thereby greatly improving the friction force.

[0060] The combined hoop of the utility model is suitable for the pier cap beam construction of square high pier columns (because the cost of erecting a support is high and the safety risk is great), low ground bearing capacity (because if the support is erected, the ground needs to be treated, which increases the construction cost), and high quality appearance requirements (without allowing to make a through bar and pre-bury a bracket). The combined hoop does not need to reserve holes in the pier column, does not need to pre-bury steel plates in the pier column, does not need to erect high supports and treat the ground, and can also avoid the problem that the ordinary square hoop cannot provide sufficient friction force due to insufficient normal stress of the main stress surface between the hoop and the pier column.

[0061] It is easy for those skilled in the art to understand that the above description is only the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A square pier assembly hugger characterized in that, The utility model relates to a kind of square pier clamping devices, including: Symmetrically arranged half-square hoop (1), a certain gap is left between two groups of half-square hoop (1);The half-square hoop (1) includes panel (101), inner gusset (102) and force transmission structure; Flange (2) is arranged at the butt joint of half-square hoop (1); High-strength bolt (3) is passed through flange (2) and is connected into one body two groups of symmetrically arranged half-square hoop (1); And rubber pad (4) is sleeved on square pier, which separates square pier from two groups of half-square hoop (1).

2. A square pier assembly clamp according to claim 1, wherein, The force transmission structure includes I-beam (103) and channel steel (104).

3. A square pier assembly clamp according to claim 2, wherein, The I-beam (103) is provided with multiple groups, and its two ends are fixedly connected with panel (101) and inner gusset (102) by welding respectively;The channel steel (104) is located at the bending portion of panel (101), and its slot is inward, and its two ends are fixedly connected with panel (101) and inner gusset (102) by welding respectively.

4. A square pier assembly hugger according to any one of claims 1 to 3, wherein, It also includes a reinforced structure, which includes trapezoidal rib plate (105) and annular rib plate (106).

5. A square pier assembly hugger as defined in claim 4 wherein, The trapezoidal rib plate (105) is arranged at the bending portion of panel (101), and its top and bottom are fixedly connected with panel (101) and inner gusset (102) respectively, its right-angle waist is fixedly connected with channel steel (104), and its oblique waist is fixedly connected with the bending edge of panel (101). The annular rib plate (106) is provided with multiple groups, and multiple groups of annular rib plate (106) are fixedly arranged in parallel and annularly on the outer side of panel (101).

6. A square pier assembly hugger as claimed in any one of claims 1 to 3, wherein, The flange (2) is a plate structure, which is fixedly arranged at the bottom of half-square hoop (1) by welding, and multiple connecting holes are formed in it, and high-strength bolt (3) is locked two groups of half-square hoop (1) after passing through the connecting hole and cooperating with nut.

7. A square pier assembly hugger as claimed in any one of claims 1 to 3, wherein, Multiple groups of reinforcing rib plates (5) are also fixedly arranged between the flange (2) and the half-square hoop (1).

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