Pressure grouting pre-filled aggregate steel pipe concrete column with built-in grouting pipe and preparation method thereof

Abstract

The application discloses a pressure grouting pre-filled aggregate steel pipe concrete column with a built-in grouting pipe and a preparation method thereof. Coarse aggregate is mixed uniformly and then placed in the gap between an outer steel pipe and the grouting pipe, and the coarse aggregate is vibrated by a vibrating rod to achieve compaction, so that the coarse aggregate is in sharp-to-sharp contact and interlocked, then the coarse aggregate is filled to the height of the outer steel pipe, and then an upper end plate is welded to fix the outer steel pipe, and the upper end plate naturally seals the built-in grouting pipe. Then, a grouting machine injects slurry material through the input pipe, and the slurry material penetrates into the coarse aggregate gap through the round hole of the built-in grouting pipe. Until the slurry material fills the coarse aggregate gap through the round hole of the grouting pipe and overflows the output pipe. The application has the advantages of simple preparation operation, changed traditional steel pipe concrete preparation mode, and the like. In addition, due to the interlocking and sharp-to-sharp contact of the coarse aggregate, the technical problem of easy emptying and debonding caused by internal concrete shrinkage of traditional steel pipe concrete is effectively avoided, and the steel pipe concrete column has the advantages of light self-weight, good seismic performance and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel pipe concrete column, and particularly relates to a pressure grouting pre-filled aggregate steel pipe concrete column with an embedded grouting pipe and a preparation method. BACKGROUND

[0002] The steel pipe concrete composite structure has the advantages of high bearing capacity, good seismic performance, simple construction, remarkable economic benefits and the like, and has a broad application prospect in complex mountainous bridge construction. The key to good mechanical properties of the steel pipe concrete lies in the close combination of the steel pipe and the concrete in the pipe. Due to the shrinkage characteristics of the concrete in the pipe and the existing grouting process, there is often a debonding and emptying problem between the concrete in the pipe and the steel pipe.

[0003] On the other hand, the double-wall hollow column is a hollow steel pipe concrete column composed of an outer steel pipe, an inner steel pipe and concrete filled between the two, and has the advantages of light weight, large bending stiffness, high strength, good durability, good ductility and seismic performance, and convenient construction. The smaller the hollow rate (hollow area / outer steel pipe inner diameter cross-sectional area) of the double-wall hollow column, the greater the ductility and bearing capacity. Existing documents show that when the hollow rate of the double-wall hollow column is not more than 0.2, the hollow part has no effect on the bearing capacity of the column, that is, at this time, whether the inner steel pipe is filled with filling material has a negligible effect on the bearing capacity of the double-wall hollow column. Therefore, the inner steel pipe with a hole having a hollow rate not more than 0.2 can be used as a grouting pipe for pre-filled aggregate to form a pressure grouting pre-filled aggregate steel pipe concrete column with an embedded grouting pipe.

[0004] As known, the pre-filled aggregate concrete is formed by pre-filling coarse aggregate and then pouring high-fluidity paste. The pre-filled aggregate concrete has high coarse aggregate volume content, sharp-to-sharp contact of aggregate, and mutual interlocking, which can fully play the skeleton role of coarse aggregate and significantly improve the volume stability compared with conventional concrete. In addition, the amount of adhesive material is small, and the shrinkage is small, which reduces and avoids the debonding problem between the steel pipe and the concrete existing in the traditional steel pipe concrete column. The pre-filled aggregate concrete replaces the concrete in the steel pipe, greatly improves the volume stability of the concrete, ensures the joint work of the steel pipe and the concrete in the pipe, fully utilizes the advantages of the steel pipe concrete and the pre-filled aggregate concrete, and promotes the development and application of the steel pipe concrete composite structure. SUMMARY

[0005] Based on the above technical problems, the present application provides a pressure grouting pre-filled aggregate steel pipe concrete column with an embedded grouting pipe and a preparation method.

[0006] The pressure grouting pre-filled aggregate steel pipe concrete column with an embedded grouting pipe is mainly composed of an outer steel pipe, an embedded grouting pipe, coarse aggregate and paste material.

[0007] The preferred built-in grouting pipe is provided with holes around the pipe body and is arranged at the center of the outer steel pipe, which is beneficial to the seepage of the slurry material through the holes of the built-in grouting pipe and the uniform filling of the aggregate voids under the pressure of the grouting machine; the upper and lower ends of the built-in grouting pipe are respectively provided with output pipes and input pipes, the output pipes and the input pipes are respectively provided with valves, and the output pipes and the input pipes are both penetrated to the outside of the outer steel pipe; the input pipes are connected with the grouting machine;

[0008] The preferred built-in grouting pipe is provided with holes around the pipe body and is arranged at the center of the outer steel pipe, which is beneficial to the seepage of the slurry material through the holes of the built-in grouting pipe and the uniform filling of the aggregate voids under the pressure of the grouting machine; the upper and lower ends of the built-in grouting pipe are respectively provided with output pipes and input pipes, the output pipes and the input pipes are respectively provided with valves, and the output pipes and the input pipes are both penetrated to the outside of the outer steel pipe; the input pipes are connected with the grouting machine;

[0009] The preferred built-in grouting pipe is provided with holes around the pipe body and is arranged at the center of the outer steel pipe, which is beneficial to the seepage of the slurry material through the holes of the built-in grouting pipe and the uniform filling of the aggregate voids under the pressure of the grouting machine; the upper and lower ends of the built-in grouting pipe are respectively provided with output pipes and input pipes, the output pipes and the input pipes are respectively provided with valves, and the output pipes and the input pipes are both penetrated to the outside of the outer steel pipe; the input pipes are connected with the grouting machine;

[0010] The preferred built-in grouting pipe is provided with holes around the pipe body and is arranged at the center of the outer steel pipe, which is beneficial to the seepage of the slurry material through the holes of the built-in grouting pipe and the uniform filling of the aggregate voids under the pressure of the grouting machine; the upper and lower ends of the built-in grouting pipe are respectively provided with output pipes and input pipes, the output pipes and the input pipes are respectively provided with valves, and the output pipes and the input pipes are both penetrated to the outside of the outer steel pipe; the input pipes are connected with the grouting machine;

[0011] The preparation method of the built-in grouting pipe for the pressure grouting pre-filled aggregate steel pipe concrete column comprises the following steps:

[0012] The preparation method of the built-in grouting pipe for the pressure grouting pre-filled aggregate steel pipe concrete column comprises the following steps:

[0013] The preparation method of the built-in grouting pipe for the pressure grouting pre-filled aggregate steel pipe concrete column comprises the following steps:

[0014] 1、The present application adopts the pumping mode and carries out grouting through the built-in grouting pipe provided with holes around the pipe body.

[0015] 2、When the hollow rate of the double-wall hollow pipe is not more than 0.2, the hollow part has little influence on the bearing capacity of the column, that is, whether the inner steel pipe is filled with the filling material has little influence on the bearing capacity of the double-wall hollow column. The present application utilizes the technical point and controls the ratio of the sectional area of the built-in grouting pipe to the sectional area of the outer steel pipe to be not more than 0.2, so that the slurry material in the built-in grouting pipe has little influence on the bearing capacity of the column. The built-in grouting pipe, the outer steel pipe, the aggregate and the slurry material form the double-wall steel pipe concrete column, which has the advantages of light self-weight, large bending stiffness, high strength, good durability, good ductility and seismic performance and convenient construction.

[0016] 3. This invention uses high-performance slurry materials, which enable the coarse aggregate and slurry materials to form a better whole and jointly bear the external load, thereby better exerting the mechanical interlocking effect and dense skeleton effect of the coarse aggregate, and significantly improving the compressive strength of the pre-filled aggregate concrete. Attached Figure Description

[0017] Figure 1 The example is a steel-concrete composite column with an inner circle and an outer square shape;

[0018] Figure 2 The example is an inner and outer circular steel tube concrete column. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] A pressure-grouted pre-filled aggregate steel pipe concrete column with an internal grouting pipe includes an outer steel pipe 1, an internal grouting pipe 2, a bottom end plate 6, a top end plate 7, coarse aggregate 3, and grout material 4. The internal grouting pipe 2 has holes all around its body and is vertically installed at the center of the outer steel pipe 1. It is fixed together with the outer steel pipe 1 by welding through the bottom end plate 6. The upper and lower ends of the internal grouting pipe 2 are respectively provided with an output pipe 21 and an input pipe 22. The output pipe 21 and the input pipe 22 are respectively equipped with valves. Both the output pipe 21 and the input pipe 22 extend to the outside of the outer steel pipe 1. The input pipe 22 is connected to a grouting machine 5. The outer steel pipe 1 is filled with coarse aggregate 3. The grout material 4 is injected by the grouting machine 5 and seeps into the voids of the coarse aggregate 3 through the holes of the internal grouting pipe 2.

[0021] The diameter of the opening in the built-in grouting pipe 2 is smaller than the minimum particle size of the coarse aggregate 3.

[0022] The top end plate 7 is welded after coarse aggregate is filled between the inner grouting pipe 2 and the outer steel pipe 1, sealing the top of the inner grouting pipe 2 and the outer steel pipe 1.

[0023] The method for preparing a pressure-grouted pre-filled aggregate steel-concrete column with an internal grouting pipe includes the following steps:

[0024] The built-in grouting pipe 2 is vertically installed inside the outer steel pipe 1, and the bottom end plate 6 is welded.

[0025] After the coarse aggregate 3 is mixed evenly, it is placed in the gap between the outer steel pipe 1 and the inner grouting pipe 2. The coarse aggregate 3 is vibrated with a vibrator to achieve compaction. The coarse aggregate 3 is then added to fill the outer steel pipe 1, and the top end plate 7 is welded.

[0026] The input pipe 22 is connected to the grouting machine 5. The valves on the input pipe 22 and the output pipe 21 are opened to pump the grout material 4 into the built-in grouting pipe 2 until the grout material 4 permeates through the holes of the built-in grouting pipe 2 into the aggregate voids and flows out from the output pipe 21. Then, the grouting is stopped and the two valves are closed.

[0027] The coarse aggregate 3 is a discontinuously graded coarse aggregate 3, and the slurry material 4 is a high-performance clean slurry.

[0028] like Figure 1 The outer steel pipe 1 is square, and the inner grouting pipe 2 is circular, forming an inner circular and outer square steel pipe concrete column; for example Figure 2 As shown, both the outer steel pipe 1 and the inner grouting pipe 2 are circular, forming an inner and outer circular steel pipe concrete column.

Claims

1. A pressure-grouted pre-filled aggregate steel pipe concrete column with built-in grouting pipe, characterized in that: The system includes an outer steel pipe (1), an inner grouting pipe (2), coarse aggregate (3), grout material (4), a bottom end plate (6), and a top end plate (7). The inner grouting pipe (2) has holes all around its body and is vertically positioned at the center of the outer steel pipe (1). The ratio of the inner diameter cross-sectional area of ​​the inner grouting pipe (2) to that of the outer steel pipe (1) does not exceed 0.

2. The inner grouting pipe (2) has an output pipe (21) and an input pipe (22) at its upper and lower ends, respectively. The output pipe (21) and the input pipe (22) are equipped with valves, and both the output pipe (21) and the input pipe (22) extend to the outside of the outer steel pipe (1). The input pipe (22) is connected to a grouting machine (5). The outer steel pipe (1) is filled with coarse aggregate (3). The grout material (4) is injected by the grouting machine (5) and penetrates into the gaps of the coarse aggregate (3) through the holes of the inner grouting pipe (2).

2. The pressure grouting pre-filled aggregate steel pipe concrete column with built-in grouting pipe according to claim 1, characterized in that: The aperture of the built-in grouting pipe (2) is smaller than the minimum particle size of the coarse aggregate (3).

3. The pressure grouting pre-filled aggregate steel pipe concrete column with built-in grouting pipe according to claim 1, characterized in that: After the coarse aggregate is filled, the top end plate (7) is welded to seal the internal grouting pipe (2) and the external steel pipe (1).

4. The method for preparing a pressure-grouted pre-filled aggregate steel-concrete column with an internal grouting pipe as described in any one of claims 1 to 3, characterized in that, Includes the following steps: The built-in grouting pipe (2) is vertically installed inside the outer steel pipe (1) and fixed by welding through the bottom end plate (6); After the coarse aggregate (3) is mixed evenly, it is placed in the gap between the outer steel pipe (1) and the inner grouting pipe (2). The coarse aggregate (3) is vibrated with a vibrator to achieve compaction. The coarse aggregate (3) is replenished to fill the outer steel pipe (1), and the top end plate (7) is welded. Connect the input pipe (22) to the grouting machine (5), open the valves on the output pipe (21) and the input pipe (22), pump the grout material (4) into the built-in grouting pipe (2) until the grout material (4) permeates into the aggregate voids through the holes of the built-in grouting pipe (2) and flows out from the output pipe (21), stop grouting and close both valves.

5. The method for preparing a pressure-grouted pre-filled aggregate steel-concrete column with an internal grouting pipe according to claim 4, characterized in that: The coarse aggregate (3) is a discontinuously graded coarse aggregate, and the slurry material (4) is a high-performance clean slurry.

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