A groutable steel column for highway ancillary facilities

Abstract

The present invention relates to a groutable steel column for ancillary facilities on a highway, comprising a central grouting pipe and a straight pipe section and a tapered pipe section with spiral blades disposed on the outer periphery. The straight pipe section has a steel column grouting hole formed on the pipe wall, and the central grouting pipe has a grouting pipe outlet hole formed on the pipe wall. A grouting branch pipe is disposed on the outer side of each grouting pipe outlet hole. The inner end bottom of the grouting branch pipe is hingedly connected to the central grouting pipe, and the inner end of the grouting branch pipe is connected to the corresponding grouting pipe outlet hole via a corrugated pipe. The lower side limiting pipe segment of the groutable steel column is a breakable plastic pipe segment. The grouting branch pipe has a grouting station in which the outer end is horizontally inserted between the upper and lower limiting pipe segments when the central grouting pipe moves downward, and a lifting station in which the outer end is flipped downward toward the steel column body when the central grouting pipe moves downward. The present invention solves the technical problem of long construction period in the prior art of using underground concrete piers as the foundation of ancillary facilities.

Description

Technical Field

[0001] The present invention relates to the field of infrastructure construction on highways, and in particular to a grouting type steel column for highway ancillary facilities. Background Art

[0002] During highway construction, many of its ancillary facilities require foundations, such as those for highway guardrails, gantries, signage, sound barriers, and solar photovoltaic mounting systems. These traditional foundations all utilize a cast-in-place concrete structure, which involves first digging a hole, placing a steel cage inside, and finally pouring concrete into the hole to form a large cubic underground concrete pier. During use, the highway's ancillary facilities are then installed on the corresponding underground concrete pier.

[0003] The existing problems with this traditional foundation are that it requires multiple processes such as digging holes, preparing steel cages, laying steel cages, pouring concrete, etc., which leads to a long construction period, strong destructiveness to the ground environment of the construction site, high manpower and material costs, and difficulty in construction in special environmental areas. Summary of the Invention

[0004] The purpose of the present invention is to provide a groutable steel column for highway ancillary facilities to solve the technical problem of long construction period in the prior art of using underground concrete piers as the foundation of ancillary facilities.

[0005] To solve the above technical problems, the present invention provides a technical solution for a groutable steel column for ancillary facilities of a highway as follows:

[0006] A groutable steel column for ancillary facilities of a highway comprises a steel column body with a hollow structure, the steel column body comprising a straight pipe section and a tapered pipe section with a larger upper portion and a smaller lower portion arranged at the lower end of the straight pipe section, the upper end of the straight pipe section being provided with a torque input structure, the outer peripheries of the straight pipe section and the tapered pipe section being provided with spiral blades, a steel column grouting hole being provided on the pipe wall of the straight pipe section, the groutable steel column further comprising a central grouting pipe, a grouting pipe outlet hole being provided on the pipe wall of the central grouting pipe corresponding to the grouting holes of each steel column, a grouting branch pipe being provided on the outer side of each grouting pipe outlet hole, the inner end bottom of the grouting branch pipe being hingedly connected to the central grouting pipe, the inner end of the grouting branch pipe being connected to the corresponding grouting pipe through a corrugated pipe The slurry outlet holes are connected, and an upper limiting pipe segment and a lower limiting pipe segment with opposite notches are fixed on the inner pipe wall of the steel column body at the upper and lower sides of the corresponding steel column grouting holes. The axes of the upper limiting pipe segment and the lower limiting pipe segment are set horizontally, and the length of the upper limiting pipe segment is shorter than that of the lower limiting pipe segment. The inner concave curvature of the upper limiting pipe segment and the lower limiting pipe segment is consistent with the outer circumferential curvature of the grouting branch pipe. The lower limiting pipe segment is a breakable plastic pipe segment. The grouting branch pipe has a grouting station in which the outer end is horizontally inserted between the upper limiting pipe segment and the lower limiting pipe segment when the central grouting pipe moves downward, and a lifting station in which the outer end is flipped downward toward the steel column body when the central grouting pipe moves downward.

[0007] Furthermore, the outer end of the grouting branch pipe is provided with a rubber gasket for sealing contact with the inner wall of the steel column body, and the thickness of the rubber gasket is 0.5cm~1.5cm.

[0008] Furthermore, the steel column has a plurality of grouting holes, each of which has a different height, and each of which is evenly spaced along the circumference of the steel column body.

[0009] Furthermore, the grouting branches are evenly spaced along the circumference of the central grouting pipe.

[0010] Furthermore, the upper end of the central grouting pipe is connected to a grouting hose via a rotary joint.

[0011] Furthermore, a detachable fixing structure is provided at the upper end of the central grouting pipe for achieving detachable fixation between the central grouting pipe and the inner wall of the steel column body.

[0012] Furthermore, the detachable fixing structure includes an adjusting sleeve connected to the upper end of the central grouting pipe, and the upper and lower sides of the adjusting sleeve on the central grouting pipe are threadedly connected with an upper nut and a lower nut. The detachable fixing structure also includes at least three friction plates arranged at intervals along the circumference of the adjusting sleeve for frictional contact with the inner wall of the steel column body. Each friction plate is connected to the adjusting sleeve through a connecting rod mechanism. The connecting rod mechanism includes an upper connecting rod and a lower connecting rod arranged in parallel at intervals above and below. The outer ends of the upper connecting rod and the lower connecting rod are hingedly connected to the friction plates, and the inner ends of the upper connecting rod and the lower connecting rod are hingedly connected to the adjusting sleeve.

[0013] The beneficial effects of the present invention are as follows: in use, the torque input structure is connected to the rotary drill, and the rotary drill rotates with the steel column body. Under the action of the spiral blades, the steel column body is drilled into the ground. A steel column grouting hole is opened on the pipe wall of the steel column body. When it is necessary to inject concrete slurry between the spiral blades through the steel column grouting hole, the central grouting pipe is lowered. When the grouting branch pipe does not hit the corresponding lower limit pipe segment, the bottom of the inner end of the grouting branch pipe is hingedly connected to the central grouting pipe, and a corrugated pipe is provided between the grouting branch pipe and the central grouting pipe, the grouting branch pipe will be in an inclined posture where the outer end is lower than the inner end. When the outer end of the grouting branch pipe is supported on the lower limit pipe segment, the central grouting pipe is continued to be lowered, the height of the inner end of the grouting branch pipe is reduced, and the grouting branch pipe will slowly flip towards the horizontal posture until the outer end is stably stuck between the upper limit pipe segment and the lower limit pipe segment. After the grouting is completed, the central grouting pipe is lifted up, and the upper end of the grouting branch pipe is limited by the upper limit pipe segment, so that the lower end of the grouting branch pipe will flip downward toward the central grouting pipe, and the lower limit pipe segment will be broken by the grouting branch pipe, and the central grouting pipe is smoothly lifted up. The central grouting pipe can be used for the grouting operation of the next groutable steel column, and the steel column body serves as a disposable foundation structure to facilitate the installation of ancillary facilities on the highway. The present invention breaks the traditional process of weaving a steel cage and then grouting after the steel cage is laid, which can effectively shorten the construction period and reduce the use of concrete materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0015] Figure 1 This is a schematic diagram of the structure of the grouting steel column after it is drilled into the soil layer in the present invention;

[0016] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle mud-blocking structure;

[0017] Figure 3 yes Figure 1AA section view in the figure;

[0018] Figure 4 yes Figure 2 Schematic diagram of the coordination between the upper and lower baffles;

[0019] Figure 5 This is a schematic diagram of the state of the grouting branch pipe in the present invention when it is at the grouting station;

[0020] Figure 6 yes Figure 5 Schematic diagram of the coordination between the detachable fixed structure and the straight pipe section;

[0021] Figure 7 This is a schematic diagram of the state of the central grouting pipe when it is lowered in the present invention;

[0022] Figure 8 This is a schematic diagram of the coordination between the grouting port of the steel column and the upper and lower limiting segments in the present invention;

[0023] Figure 9 yes Figure 5 Enlarged view of point B in FIG.

[0024] Explanation of reference numerals: 1. Soil layer; 2. Groutable steel column; 3. Spiral blade; 4. Mud blocking structure; 5. Straight pipe section; 6. Conical pipe section; 7. Left baffle; 8. Upper baffle; 9. Lower baffle; 10. Guide pin; 11. Grouting port of steel column; 12. Right baffle; 13. Lower limiting pipe segment; 14. Support return spring; 15. Arc-shaped guide long hole; 16. Breaking portion; 17. Pin connecting rod; 18. Grouting branch pipe ; 19. Grouting center pipe; 20. Removable fixed structure; 21. Rotary drilling rig; 22. Driving motor; 23. Motor shaft gear; 24. Ring gear; 25. Rotating joint; 26. Grouting hose; 27. Connecting rod mechanism; 28. Upper nut; 29. ​​Adjusting sleeve; 30. Lower nut; 31. Friction plate; 32. Upper connecting rod; 33. Lower connecting rod; 34. Bellows; 35. Grouting pipe outlet hole; 36. Upper limiting pipe segment. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0026] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] The embodiment of the grouting steel column for highway ancillary facilities of the present invention is as follows: Figures 1 to 9 As shown:

[0028] The grouting type steel column 2 comprises a hollow steel column body, a straight pipe section 5 of the steel column body and a tapered pipe section 6 which is larger at the top and smaller at the bottom.

[0029] The upper end of the conical pipe section 6 is welded and fixed to the lower end of the straight pipe section 5. The outer periphery of the straight pipe section and the conical pipe section is welded and fixed with a spiral blade 3. The spiral blade 3 can be composed of a metal plate or a metal rib. A steel column grouting port 11 is opened on the pipe wall of the straight pipe section. There are multiple steel column grouting ports. The height of each steel column grouting port 11 is different, and each steel column grouting port is evenly spaced along the circumference of the groutable steel column, so as to avoid affecting the downward movement of the grouting branch pipe 18.

[0030] A corresponding mud-blocking structure 4 is provided on the outside of each steel column grouting port 11. The mud-blocking structure includes an upper baffle 8 and a lower baffle 9 fixedly arranged on the upper side of the corresponding pipe wall. The upper baffle 8 and the lower baffle 9 are arranged horizontally. The mud-blocking structure also includes a left baffle 7 and a right baffle 12 arranged in circumferential order between the upper baffle and the lower baffle. The left end of the left baffle 7 is hingedly connected to the corresponding pipe wall through the upper baffle 8 and the lower baffle 9, and the right end of the right baffle is hingedly connected to the corresponding pipe wall through the upper baffle and the lower baffle. The hinge axes of the left baffle and the right baffle are extended in the up-down direction. The left baffle 7 and the right baffle 12 are both arc-shaped plates whose axes extend in the up-down direction.

[0031] In this embodiment, the clockwise rotation direction is defined as the screw-in direction of the groutable steel column. In the clockwise direction, the left baffle 7 is located downstream of the right baffle 12, and the left end of the right baffle 12 is located on the inner side of the left baffle. The left end of the right baffle 12 is provided with an arc-shaped guide slot 15 whose axis extends in the vertical direction. The right end of the left baffle is provided with a breakable guide pin 10 that cooperates with the arc-shaped guide slot for guiding movement. In this embodiment, the guide pin 10 is made of plastic material and can therefore be broken. In other embodiments of the present invention, the guide pin can also be made of a relatively brittle metal material, such as manganese steel. The two ends of the guide pin are provided with a breakable breaking portion 16.

[0032] The width of the arcuate guide slot 15 extends vertically. Its length, or the guiding direction, extends along the circumference of the right sidewall. The width of the arcuate guide slot 15 extends vertically through the right sidewall. The upper and lower ends of the guide pin extend through the upper and lower ends of the arcuate guide slot, respectively, and are connected to the left sidewall. Pin connecting rods 17 are fixed to the upper and lower ends of the guide pin. The end of the pin connecting rod 17, distal from the guide pin, is hingedly connected (or fixedly connected) to the left sidewall.

[0033] The upper and lower ends of the left baffle 7 are hingedly connected to the upper and lower baffles via the left baffle pins. The upper and lower ends of the right baffle 12 are hingedly connected to the upper and lower baffles via the right baffle pins. The left, right, upper, and lower baffles form an impact cavity connected to the grouting port of the steel column.

[0034] A support return spring 14 is provided between the left baffle and the outer periphery of the corresponding tube wall.

[0035] The groutable steel column further comprises a central grouting pipe 19 , wherein the straight pipe section and the tapered pipe section are disposable devices, and the central grouting pipe 19 is recyclable and can be used for grouting of the next groutable steel column, thereby reducing construction costs.

[0036] A grouting pipe outlet 35 is provided on the wall of the central grouting pipe 19, which is arranged one-to-one with the grouting port 11 of each steel column. A grouting branch pipe 18 is provided on the outside of each grouting pipe outlet. Each grouting branch pipe 18 is evenly spaced along the circumference of the central grouting pipe. The bottom of the inner end of the grouting branch pipe is hingedly connected to the central grouting pipe 19. The inner end in this embodiment refers to the end close to the axis of the central grouting pipe. The inner end of the grouting branch pipe 18 is connected to the corresponding grouting pipe outlet through a corrugated pipe 34.

[0037] An upper limiting pipe segment 36 and a lower limiting pipe segment 13 with opposite notches are fixed on the internal pipe wall of the steel column body at the upper and lower sides of the corresponding steel column grouting port. The upper limiting pipe segment 36 and the lower limiting pipe segment 13 are coaxially arranged, and the axes of the upper limiting pipe segment and the lower limiting pipe segment are horizontally arranged, that is, the axes of the upper limiting pipe segment and the lower lower pipe segment are perpendicular to the axes of the straight pipe section and the central grouting pipe. The length of the upper limiting pipe segment is shorter than that of the lower limiting pipe segment. The lower limiting pipe segment 13 is a breakable plastic pipe segment. The grouting branch pipe is a round tube. The inner concave curvature of the upper limiting pipe segment and the lower limiting pipe segment is consistent with the outer circumferential curvature of the grouting branch pipe 18.

[0038] The grouting branch pipe 18 has a grouting station where the outer end is horizontally inserted between the upper limiting pipe segment 36 and the lower limiting pipe segment 13 when the central grouting pipe moves downward, and a lifting station where the outer end is flipped downward toward the steel column body when the central grouting pipe moves downward.

[0039] The outer end of the grouting branch pipe is provided with a rubber gasket 37 for sealing contact with the outer periphery of the grouting port of the corresponding steel column. The thickness of the rubber gasket is 1 cm (0.5 cm or 1.5 cm).

[0040] The upper end of the central grouting pipe is connected to a grouting hose 26 via a rotary joint 25. The upper end of the central grouting pipe is provided with a detachable fixing structure 20 for achieving detachable fixation between the central grouting pipe and the inner wall of the straight pipe section.

[0041] The detachable fixing structure includes an adjusting sleeve 29 which is sleeved on the upper end of the central grouting pipe. The upper nut 28 and the lower nut 30 are threadedly connected to the upper and lower sides of the adjusting sleeve on the central grouting pipe. The detachable fixing structure also includes three friction plates 31 which are arranged at intervals along the circumference of the adjusting sleeve for frictional contact with the inner wall of the steel column body. Each friction plate is connected to the adjusting sleeve through a connecting rod mechanism 27. The connecting rod mechanism 27 includes an upper connecting rod 32 and a lower connecting rod 33 which are arranged in parallel at intervals up and down. The outer ends of the upper connecting rod 32 and the lower connecting rod 33 are hingedly connected to the friction plate 31, and the inner ends of the upper connecting rod 32 and the lower connecting rod 33 are hingedly connected to the adjusting sleeve.

[0042] The upper end of the straight pipe section is provided with a connecting flange, which forms the torque input structure. During use, the connecting flange is bolted to the torque output terminal of a rotary drill rig 21. The rotary drill rig includes a ring gear 24 and multiple drive motors 22 spaced circumferentially along the ring gear 24. The motor shafts of the drive motors are connected to motor shaft gears 23 that mesh with the ring gear. The ring gear 24 forms the torque output terminal of the rotary drill rig. The rotary drill rotates the straight pipe section, and under the action of the spiral blades, the straight and tapered pipe sections are drilled down to the specified depth. During the drilling process, the left baffle will press down the right baffle, and the guide pin will guide the movement in the arc-shaped guide long hole. Under the joint protection of the left baffle, right baffle, upper baffle and lower baffle, soil is prevented from clogging the grouting port of the steel column. Because the clockwise direction is the drilling direction, the left baffle is located on the outside of the right baffle, which can minimize the drilling resistance. If a difficult drilling position is encountered, the rotary drill may need to rotate counterclockwise several times. The pin connecting rod ensures the spacing between the left baffle and the right baffle. The right baffle can still prevent soil from clogging the grouting port of the steel column. The upper and lower baffles are used to prevent soil from entering the grouting port of the steel column from the upper and lower sides. In addition, the upper and lower baffles also provide a basis for the installation of the left and right baffles.

[0043] When grouting is required, the concrete slurry flows into the impact cavity through the grouting port of the steel column. The upper baffle and the lower baffle flip over each other under the grouting pressure of the concrete slurry. After an acceleration process, the guide pin moves to the leftmost end of the arc-shaped guide long hole. Then the two ends of the guide pin break under the pulling action of the pin connecting rod, and the impact cavity is opened. The concrete slurry can smoothly enter between the spiral blades, thereby forming a concrete body to ensure the friction between the soil layer.

[0044] There are two ways to grout the grouting port of the steel column. One is to fix the central grouting pipe on the straight pipe section in advance and then drill in. The other is to fix the central grouting pipe on the straight pipe section after the straight pipe section and the tapered pipe section are drilled to the specified depth. Regardless of which form, the fixing process of the central grouting pipe is the same, that is: adjust the grouting branch pipe to correspond to the position of each lower side limit pipe segment, lower the height of the central grouting pipe, and in the initial state, under the influence of the corrugated pipe and its own gravity, the grouting branch pipe is in an inclined posture with the outer end height lower than the inner end height. As the central grouting pipe moves downward, the lower side of the outer end of the grouting branch pipe first passes over the upper side limit pipe segment, and then the upper side of the outer end of the grouting branch pipe is limited by the upper side limit The pipe segment is pushed up, and the outer end of the grouting branch pipe is turned upward, so that the lower side of the outer end of the grouting branch pipe moves toward the pipe wall of the straight pipe section. In this way, as the central grouting pipe descends, the bottom of the outer end of the grouting branch pipe can fall on the lower side limiting pipe segment. After the bottom of the outer end of the grouting branch pipe falls on the lower side limiting pipe segment, the height of the outer end of the grouting branch pipe no longer decreases, and the outer end of the grouting branch pipe gradually moves away from the central grouting pipe until the grouting branch pipe is horizontal. The rubber gasket at the outer end of the grouting branch pipe is against the inner edge of the grouting port of the steel column. The rubber gasket ensures the sealing of the grouting branch pipe and the inner edge of the grouting port of the steel column. At the same time, the axial compression of the rubber gasket is used to reduce the overall length requirement of the grouting branch pipe. When the grouting branch pipe is horizontal, it is stably stuck between the central grouting pipe and the straight pipe section. At this point, the height of the lower nut is adjusted, the upper nut is tightened downward, and the connecting rod mechanism is used to press the friction plate against the wall of the straight pipe section to secure the central grouting pipe. Concrete slurry can then be introduced into the central grouting pipe through the grouting hose. The concrete slurry is injected between the spiral blades through the grouting branch pipe and the steel column grouting port, ensuring friction with the soil layer 1. After grouting is completed, the upper nut is loosened, the height of the upper nut is raised, and the central grouting pipe is lifted. The upper end of the outer end of the grouting branch pipe is restrained by the upper limit pipe segment, which is a steel pipe segment. The outer end of the grouting branch pipe will flip downward toward the central grouting pipe, and the grouting branch pipe will crush the lower limit pipe segment, allowing the central grouting pipe to be smoothly lifted and recovered for the next use. When in use, the bottom of the highway guardrail, highway gantry or highway signboard or highway ancillary facilities can be directly fixed on the connecting flange at the upper end of the straight pipe section.

[0045] The groutable steel column of the present invention is applied to ancillary facilities of highways, and the required bearing capacity is not particularly large. The length of the straight pipe section is between 0.5m and 2m, and the outer diameter of the straight pipe section is between 30cm and 60cm.

[0046] In the foregoing description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0048] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A groutable steel column for highway ancillary facilities, characterized by: The steel column body comprises a hollow structure, the steel column body comprises a straight pipe section and a tapered pipe section with a larger upper portion and a smaller lower portion arranged at the lower end of the straight pipe section, the upper end of the straight pipe section is provided with a torque input structure, the outer periphery of the straight pipe section and the tapered pipe section is provided with spiral blades, a steel column grouting hole is opened on the pipe wall of the straight pipe section, the grouting type steel column further comprises a central grouting pipe, a grouting pipe outlet hole which is arranged one by one corresponding to the grouting holes of each steel column is opened on the pipe wall of the central grouting pipe, a grouting branch pipe is arranged on the outside of each grouting pipe outlet hole, the inner end bottom of the grouting branch pipe is hingedly connected to the central grouting pipe, the inner end of the grouting branch pipe is connected to the corresponding grouting pipe outlet hole through a corrugated pipe, and the steel column An upper limiting pipe segment and a lower limiting pipe segment with opposite notches are fixed on the inner pipe wall of the main body at the upper and lower sides of the corresponding steel column grouting holes. The axes of the upper limiting pipe segment and the lower limiting pipe segment are set horizontally. The length of the upper limiting pipe segment is shorter than that of the lower limiting pipe segment. The inner concave curvature of the upper limiting pipe segment and the lower limiting pipe segment is consistent with the outer circumferential curvature of the grouting branch pipe. The lower limiting pipe segment is a breakable plastic pipe segment. The grouting branch pipe has a grouting station in which the outer end is horizontally inserted between the upper limiting pipe segment and the lower limiting pipe segment when the central grouting pipe moves downward, and a lifting station in which the outer end is flipped downward toward the steel column body when the central grouting pipe moves upward.

2. The groutable steel column according to claim 1, characterized in that: The outer end of the grouting branch pipe is provided with a rubber gasket for sealing contact with the inner wall of the steel column body, and the thickness of the rubber gasket is 0.5cm~1.5cm.

3. The groutable steel column according to claim 1, characterized in that: There are multiple grouting holes in the steel column, and the heights of the grouting holes of each steel column are different. The grouting holes of each steel column are evenly spaced along the circumference of the steel column body.

4. The groutable steel column according to claim 1, characterized in that: The grouting branches are evenly spaced along the circumference of the central grouting pipe.

5. The groutable steel column according to claim 1, characterized in that: The upper end of the central grouting pipe is connected with a grouting hose through a rotary joint.

6. The groutable steel column according to any one of claims 1 to 5, characterized in that: The upper end of the central grouting pipe is provided with a detachable fixing structure for realizing detachable fixation between the central grouting pipe and the inner wall of the steel column body.

7. The groutable steel column according to claim 6, characterized in that: The detachable fixing structure includes an adjusting sleeve connected to the upper end of the central grouting pipe, and the upper and lower sides of the adjusting sleeve on the central grouting pipe are threadedly connected with an upper nut and a lower nut. The detachable fixing structure also includes at least three friction plates arranged at intervals along the circumference of the adjusting sleeve for frictional contact with the inner wall of the steel column body. Each friction plate is connected to the adjusting sleeve through a connecting rod mechanism. The connecting rod mechanism includes an upper connecting rod and a lower connecting rod arranged in parallel at intervals above and below. The outer ends of the upper connecting rod and the lower connecting rod are hingedly connected to the friction plates, and the inner ends of the upper connecting rod and the lower connecting rod are hingedly connected to the adjusting sleeve.

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