A hollow sandwiched reinforced concrete column with an assembled hook and a construction method thereof

Abstract

The present application relates to a kind of hollow sandwiched reinforced concrete column of hook type, U-shaped steel plate and the corresponding surface between inner steel tube are connected by reinforcing bar and fixed distance bolt rod, reinforcing bar is composed of hook reinforcing bar and U-shaped reinforcing bar, hook reinforcing bar is fixed to the inner surface of U-shaped steel plate, U-shaped reinforcing bar is fixed to the outer surface of inner steel tube, the hook head of hook reinforcing bar is all inwardly curved with short hook downward, the hook head of short hook is outwardly curved with long hook downward again, the long hook of hook reinforcing bar in hollow sandwiched spacing is gradually increased from top to bottom, and the inner curved part of short hook is hooked on corresponding U-shaped reinforcing bar.The installation and layout are convenient, suitable for prefabricated construction, and the use effect is good.Fixed distance bolt rod ensures the layout position of inner and outer two steel pipes in prefabricated construction, facilitates the alignment of reinforcing bar, hook reinforcing bar design facilitates on-site assembly and ensures that reinforcing bar is locked layer by layer, reinforcing bar is fully tensioned to fully play the role of reinforced steel pipe sleeve hoop constraint, effectively prevent local buckling of steel pipe and separation of steel pipe and concrete.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of hollow sandwiched reinforcing steel pipe concrete column of hook type and construction method. BACKGROUND

[0002] With the development of economic construction, the high bridge pier of steel-concrete composite rigid frame bridge across valley highway and railway and the huge column or core tube of super high-rise building have very high requirements on the bearing capacity, ductility stiffness, seismic performance, cross-sectional size and economic benefit of structure, and large hollow ratio hollow sandwiched reinforcing steel pipe concrete has broad application prospect in these two fields.

[0003] The hollow sandwiched reinforcing steel pipe concrete column is usually composed of inner and outer two layers of steel pipe, core concrete and restraining bar. Compared with the traditional steel pipe concrete column, the hollow sandwiched reinforcing steel pipe concrete column has light weight, good seismic performance, high bending stiffness, good ductility, low cost and high restraint efficiency. The restraining bar is welded on the inner and outer steel pipe walls to strengthen the interaction between the inner and outer steel pipe and the concrete, directly restrain the concrete and strengthen the restraining effect of the steel pipe on the concrete, thereby reducing the interface slip, increasing the stiffness, restraining the concrete and improving the energy dissipation, and strengthening the bending resistance of the steel pipe. However, at the same time, this construction measure also means that the inner and outer steel pipe have small interlayer space in the test piece with large hollow ratio, and it is difficult to weld the restraining bar on the steel pipe wall. There are three common processing methods at present: first, steel mesh form. The longitudinal restraining bar and positioning longitudinal bar in the whole column are welded to form a steel mesh, and the mesh is inserted between the inner and outer steel pipe at a designed interval. In this method, the restraining bar is not welded on the inner and outer steel pipe, and the restraining bar does not fully play the role of restraining the steel pipe and strengthening the concrete. Second, local welding form. The basic processing method is the same as the first method. After the restraining bar mesh is inserted between the steel pipes, part of the horizontal restraining bar is spot-welded on the inner and outer steel pipe walls at both ends of the steel pipe. This method also cannot fully play the role of the restraining bar. Third, perforation welding method. The inner and outer two layers of steel pipe are placed in the center, the design restraining bar position is marked on the outer steel pipe, a hole is drilled at the marked position using a drilling machine, the inner and outer steel pipes are penetrated, and then the horizontal restraining bar is inserted into the hole and welded on the inner side of the inner steel pipe and the outer side of the outer steel pipe to block the hole. However, this method is time-consuming and labor-intensive, and additional labor costs are required. At the same time, the opening of the steel pipe to some extent also weakens the integrity of the steel pipe. The on-site construction effect of the above three methods cannot be suitable for industrial assembly construction. SUMMARY

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present application is to provide a hook type hollow sandwiched reinforcing steel pipe concrete column and construction method.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: an assemblable hook-type hollow sandwich braced steel pipe concrete column, comprising an inner steel pipe and an outer steel pipe, wherein the outer steel pipe is sleeved on the outer periphery of the inner steel pipe, and the gap between the two forms a hollow sandwich spacing; the outer steel pipe is composed of two U-shaped steel plates spliced ​​together to form an annular pipe; the corresponding surfaces of the U-shaped steel plates and the inner steel pipe are connected by bracing and spacer rods; the bracing is composed of hook bracing and U-shaped bracing; the hook bracing is fixed to the inner surface of the U-shaped steel plate, and the U-shaped bracing is fixed to the outer surface of the inner steel pipe; the hook head of the hook bracing has a short oblique hook that bends downward inward, and the hook head of the short oblique hook bends downward outward to form a long oblique hook; the long oblique hook of the hook bracing in the hollow sandwich spacing gradually increases from top to bottom; the inner bend of the short oblique hook hooks onto the corresponding U-shaped bracing.

[0006] Preferably, the inner surface of the U-shaped steel plate and the outer surface of the inner steel pipe are connected by several sets of tie rods.

[0007] Preferably, the plurality of tie rods are distributed in the form of M rows × N columns.

[0008] Preferably, the open end of the U-shaped tie rod is fixed to the outer surface of the inner steel pipe.

[0009] Preferably, the angle α between the short oblique hook and the horizontal plane is less than 90°, and the angle β between the long oblique hook and the horizontal plane is greater than 90°.

[0010] Preferably, there are several spacer rods, which are distributed on the upper and lower ends of the hollow interlayer spacing.

[0011] Preferably, at each end of the hollow interlayer spacing, two spacer rods are welded between the inner surface of the U-shaped steel plate and the inner steel pipe, and one spacer rod is welded between the inner surface of the opening side of the U-shaped steel plate and the inner steel pipe.

[0012] A construction method for a hook-type hollow sandwich reinforced steel pipe concrete column is as follows: 1) Apply lubricating oil to the hook reinforcement on the left U-shaped steel plate and insert the U-shaped steel plate into the inner steel pipe with a staggered upper and lower position until it reaches the spacer rod, so that the hook reinforcement and the U-shaped reinforcement on the inner steel pipe are aligned and the opening of the U-shaped steel plate is aligned with the spacer rod. Then, the hook reinforcement is assembled into the corresponding U-shaped reinforcement with the U-shaped steel plate facing down. Simple spot welding is performed at the spacer rod position to fix the left U-shaped steel plate to ensure that the two U-shaped steel plates can be aligned and welded; 2) Assemble the right U-shaped steel plate using the method in step 1); 3) After the left and right U-shaped steel plates are assembled, weld them at the aligned position, that is, at the spacer rods on the front and back sides, to form an integral outer steel pipe; 4) Weld the spacer rods at the top and bottom of the steel pipe to the outer steel pipe, and then weld the bottom plate at the bottom of the steel pipe; 5) Pour self-compacting concrete at the hollow sandwich spacing position.

[0013] Compared with existing technologies, this invention has the following advantages: the design of the spacer rod, hook tie rod, and U-shaped tie rod is reasonable, and the processing, manufacturing, and installation are convenient. It is suitable for prefabricated construction and has good performance. The spacer rod ensures the arrangement position of the steel pipes on both the inner and outer sides during on-site prefabricated construction, facilitating tie rod alignment. The hook tie rod design facilitates on-site assembly and ensures that the tie rods are locked layer by layer. The tie rods are fully tightened, thereby fully exerting the function of reinforcing the steel pipe sleeve constraint and effectively preventing local buckling of the steel pipe and separation of the steel pipe from the concrete.

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the structure of an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the inner steel pipe structure.

[0017] Figure 3 This is a schematic diagram of the structure of a U-shaped steel plate.

[0018] Figure 4 This is a schematic diagram showing the connection between the U-shaped steel plate and the inner steel pipe.

[0019] Figure 5 This is a schematic diagram of the connection of the tensioner.

[0020] Figure 6 This is a parameter diagram for the tensioner.

[0021] Figure 7 This is a schematic diagram showing the distribution of the reinforcing bars. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] like Figures 1-7As shown, this embodiment provides an assemblable hook-type hollow sandwich reinforced steel tube concrete column, including an inner steel tube 1 and an outer steel tube 2. The outer steel tube is sleeved on the outer periphery of the inner steel tube, and the gap between the two forms a hollow sandwich spacing. The outer steel tube is formed by splicing two U-shaped steel plates 3 to form a ring tube. The corresponding surfaces of the U-shaped steel plates and the inner steel tube are connected by tie rods 4 and spacer rods 5. The tie rods are composed of hook tie rods 6 and U-shaped tie rods 7. The hook tie rods are fixed to the inner surface of the U-shaped steel plates, and the U-shaped tie rods are fixed to the outer surface of the inner steel tube. The hook heads of the hook tie rods all have short oblique hooks 8 that bend downwards and inwards, and the hook heads of the short oblique hooks bend downwards and outwards to form long oblique hooks 9. The long oblique hooks of the hook tie rods in the hollow sandwich spacing gradually increase in length from top to bottom. The inward bend of the short oblique hooks hooks onto the corresponding U-shaped tie rods.

[0026] The inner and outer steel pipes can be prefabricated in the factory. Two types of ties, U-shaped ties and hook ties, are welded to the inner and outer steel pipes respectively. This method is different from the previous direct welding and through-hole welding methods and solves the problem of welding difficulties in the narrow space of the hollow sandwich steel pipe concrete column.

[0027] The hook tie rod adopts a double diagonal rib design, with the length of the long diagonal hook gradually increasing from the top to the bottom of the steel pipe, so as to facilitate the insertion of the hook and ensure a firm lock with the U-shaped tie rod.

[0028] On-site assembly is convenient. The inner and outer layers of steel pipes are interlocked by two types of tie rods, which fully exerts the binding effect and strengthens the steel pipes' constraint on the concrete. After assembly, only the base plate and the outer layer of steel pipes need to be welded. It has the advantages of convenient and quick construction, high strength, and material saving.

[0029] In this embodiment of the invention, the inner surface of the U-shaped steel plate and the outer surface of the inner steel pipe are connected by several sets of tie rods.

[0030] In this embodiment of the invention, the plurality of sets of tie rods are distributed in the form of M rows × N columns (M and N are integers).

[0031] In this embodiment of the invention, the open end of the U-shaped tie rod is fixed to the outer surface of the inner steel pipe.

[0032] In this embodiment of the invention, the angle α between the short oblique hook and the horizontal plane is less than 90°, and the angle β between the long oblique hook and the horizontal plane is greater than 90°, forming a double oblique bar shape. This is because: existing hollow sandwich steel pipe concrete with internal tie bars or built-in transverse connection structure mostly uses straight bars or ordinary steel bar hooks. Due to the rough surface of the spiral steel bar and lack of friction, and the collision volume of the two side bars in the narrow sandwich space, it is inconvenient to assemble such components on site. It is not easy to lock the inner and outer steel pipes together and it is not easy to ensure the assembly quality and accuracy. The reason for the solution of the present invention is: (1) Double oblique hooks with a certain angle. Using double oblique hooks with a certain angle can expand the contact space between the hook and the U-shaped tie bar, which is convenient for the movement of the outer steel pipe and the insertion of the hook into the U-shaped tie bar from top to bottom; (2) At the same time, the upper part of the hook is set at a certain angle to ensure that the U-shaped tie bar is tightly attached, thereby making full use of the tie bar, realizing quick assembly while ensuring the overall assembly quality. (3) The length of the long diagonal hook decreases from bottom to top. This is because: the internal space of the sandwich steel pipe is limited, but in order to ensure the binding effect of the tie rod, the internal tie rod constraint or transverse connection structure needs to be arranged with a certain density in the steel pipe space. Ordinary hook design requires extremely high precision, and whether the hook is inserted downward or connected by rotating the steel pipe, it is not easy to assemble on site and it is difficult to ensure that each level of tie rod is fully tied. The principle of the design of gradually decreasing the length of the long diagonal hook from bottom to top adopted in this invention lies in the on-site assembly steps. First, the inner steel pipe is erected, and then the double diagonal hook is inserted into the outer steel pipe from one side at a position higher than the U-shaped tie rod and inserted downward. Therefore, in order to facilitate the insertion of the hook and ensure that it is firmly locked with the U-shaped tie rod, the length of the diagonal hook tie rod at the bottom of the steel pipe needs to be designed to ensure positioning. At the same time, the length of the long diagonal hook is gradually reduced upward so that the diagonal hook tie rod contacts the U-shaped rib in turn and then locks, thereby ensuring the locking quality of each level of tie rod.

[0033] in α This represents the angle of inclination of the short, slanted hook, used to secure the U-shaped tie rod. α The angle should be designed to be less than 90°. β This represents the tilt angle of the long, slanted hook, designed to facilitate the insertion of the U-shaped tie rod. β The angle should conform to β >90°; a i (i=1~n) represents the length of the long diagonal hooks arranged from top to bottom on the steel pipe, a1 is the length of the first long diagonal hook at the top, a n The length of the bottom long diagonal hook is designed to gradually increase from top to bottom, satisfying a1 < a2 < a 3······ <a n This facilitates insertion and ensures a secure lock with the U-shaped tie.

[0034] In this embodiment of the invention, there are several fixed-distance bolts, which are distributed on the upper and lower ends of the hollow interlayer spacing.

[0035] In this embodiment of the invention, at each end of the hollow interlayer spacing, a spacer rod is welded to the inner steel pipe. The length of the spacer rod is slightly smaller than the width of the hollow interlayer spacing. Two spacer rods are welded between the inner surface of the U-shaped steel plate and the inner steel pipe, and one spacer rod is welded between the inner surface of the open side of the U-shaped steel plate and the inner steel pipe. When one side of the U-shaped steel plate is inserted, the position is maintained by the front spacer rod, and the open side is aligned with the spacer rod and simply spot-welded, thereby fixing one side of the U-shaped steel plate to facilitate the insertion and alignment of the other side of the U-shaped steel plate and ensure the overall welding quality of the steel pipe.

[0036] A construction method for a hook-type hollow sandwich reinforced steel pipe concrete column is as follows: 1) Apply lubricating oil to the hook reinforcement on the left U-shaped steel plate and insert the U-shaped steel plate into the inner steel pipe with a staggered upper and lower position until it reaches the spacer rod, so that the hook reinforcement and the U-shaped reinforcement on the inner steel pipe are aligned and the opening of the U-shaped steel plate is aligned with the spacer rod. Then, the hook reinforcement is assembled into the corresponding U-shaped reinforcement with the U-shaped steel plate facing down. Simple spot welding is performed at the spacer rod position to fix the left U-shaped steel plate to ensure that the two U-shaped steel plates can be aligned and welded; 2) Assemble the right U-shaped steel plate using the method in step 1); 3) After the left and right U-shaped steel plates are assembled, weld them at the aligned position, that is, at the spacer rods on the front and back sides, to form an integral outer steel pipe; 4) Weld the spacer rods at the top and bottom of the steel pipe to the outer steel pipe, and then weld the bottom plate at the bottom of the steel pipe; 5) Pour self-compacting concrete at the hollow sandwich spacing position.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A hollow sandwiched reinforced concrete column with a hook-attachable, comprising an inner steel pipe and an outer steel pipe, the outer steel pipe being sleeved on the outer periphery of the inner steel pipe, a hollow sandwiched space being formed between the two, characterized in that: The outer steel pipe is composed of two U-shaped steel plates which are connected by a plurality of groups of reinforcing bars and distance bolts, the U-shaped steel plates are connected to the corresponding surfaces of the inner steel pipe, the reinforcing bars are composed of hook reinforcing bars and U-shaped reinforcing bars, the hook reinforcing bars are fixed to the inner surfaces of the U-shaped steel plates, the U-shaped reinforcing bars are fixed to the outer surfaces of the inner steel pipe, the hook heads of the hook reinforcing bars are inwardly bent downward to form short hooks, the hook heads of the short hooks are outwardly bent downward to form long hooks, the long hooks of the hook reinforcing bars in the hollow sandwich spacing gradually increase from top to bottom, and the inwardly bent parts of the short hooks are hooked on the corresponding U-shaped reinforcing bars.

2. The assemblable hooked hollow sandwiched-ribbed steel tubular concrete column according to claim 1, characterized in that: The U-shaped steel plates are connected to the corresponding surfaces of the inner steel pipe by a plurality of groups of reinforcing bars.

3. The assemblable hooked hollow sandwiched-ribbed steel tubular concrete column according to claim 2, characterized in that: The plurality of groups of reinforcing bars are distributed in the form of M rows and N columns.

4. The assemblable hooked hollow sandwiched-rib steel pipe concrete column according to claim 1, characterized in that: The open ends of the U-shaped reinforcing bars are fixed to the outer surfaces of the inner steel pipe.

5. The assemblable hooked hollow sandwiched-rib steel pipe concrete column according to claim 1, characterized in that: The included angle between the short hook and the horizontal plane is less than 90 degrees, and the included angle between the long hook and the horizontal plane is greater than 90 degrees.

6. The assemblable hooked hollow sandwiched-rib steel pipe concrete column according to claim 1, characterized in that: The number of distance bolts is several, and the distance bolts are distributed at the upper and lower ends of the hollow sandwich spacing.

7. The assemblable hooked hollow sandwiched-rib steel pipe concrete column according to claim 6, characterized in that: In each end side of the hollow sandwich spacing, two distance bolts are welded between the middle inner surface of the U-shaped steel plate and the inner steel pipe, and one distance bolt is welded between the open side inner surface of the U-shaped steel plate and the inner steel pipe.

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