Seawater-sea sand concrete composite column and construction method thereof

Abstract

The application relates to the technical field of building materials for marine construction engineering, in particular to a buckle type connected high-performance anticorrosion sleeve-seawater sea sand concrete composite column and a construction method thereof. The composite column comprises a high-performance reinforced concrete sleeve located at the outside, and a seawater sea sand concrete filling layer is arranged in the high-performance reinforced concrete sleeve. The high-performance reinforced concrete sleeve is spliced by a plurality of high-performance reinforced concrete sleeve unit segments, and comprises a bottom sleeve unit segment, N middle sleeve unit segments and a top sleeve unit segment, and N is greater than or equal to 0. Concave-convex splicing structures matched with each other are arranged between the upper end of the bottom sleeve unit segment and the lower end of the middle sleeve unit segment and between the upper end of the middle sleeve unit segment and the lower end of the top sleeve unit segment. The seawater sea sand concrete used in the composite column can better utilize marine resources, and the high-performance concrete can better resist seawater erosion, protect the internal steel bars from rusting, and improve the mechanical properties and durability of the structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials for marine construction engineering, and particularly relates to a buckle type connected high-performance anticorrosion sleeve-seawater sea sand concrete composite column and a construction method thereof. BACKGROUND

[0002] The use of seawater and sea sand for concrete preparation can better solve the problem of large demand for concrete in infrastructure construction and the shortage of fresh water and river sand, and is conducive to the development and construction of the marine industry. However, there are a large number of chloride ions in seawater and sea sand, which can accelerate the corrosion of steel bars in the building structure, reduce the bearing capacity of the structure, and affect the durability of the structure, which is not conducive to the engineering application of seawater and sea sand concrete and the development of the marine industry. Therefore, it is necessary to optimize the construction method of seawater and sea sand concrete structure to improve the durability of the structure.

[0003] Currently, there are mainly two types of measures to improve the durability of reinforced concrete structures. One type of measure is taken for the concrete itself, mainly including the use of high-performance concrete, the addition of steel rust inhibitor, the increase of the thickness of the concrete protective layer, and the concrete surface coating. Another type of measure is taken for the easily corroded steel bars, mainly including the use of steel rust inhibitor, epoxy coated steel bars, the use of corrosion-resistant composite steel bars (such as galvanized steel bars and stainless steel bars), and the use of cathodic protection. However, these two types of methods mainly have the disadvantages of inflexible construction process, large amount of material and complex composition, and have a large optimization space. In order to solve the above problems, a buckle type connected high-performance anticorrosion sleeve-seawater sea sand concrete composite column structure and a construction method thereof are proposed. SUMMARY

[0004] The purpose of the present application is to provide a seawater and sea sand concrete composite column and a construction method thereof. The use of seawater and sea sand concrete can better utilize marine resources, and high-performance concrete can better resist seawater erosion, protect the internal steel bars from corrosion, and improve the mechanical properties and durability of the structure.

[0005] The technical solution of the present application is as follows: a seawater and sea sand concrete composite column, comprising an outer high-performance reinforced concrete sleeve, and a seawater and sea sand concrete filling layer arranged in the high-performance reinforced concrete sleeve; the high-performance reinforced concrete sleeve is composed of a plurality of high-performance reinforced concrete sleeve unit segments, including a bottom sleeve unit segment, N middle sleeve unit segments, and a top sleeve unit segment, and N is greater than or equal to 0; a concave-convex splicing structure is arranged between the upper end of the bottom sleeve unit segment and the lower end of the middle sleeve unit segment, and between the upper end of the middle sleeve unit segment and the lower end of the top sleeve unit segment.

[0006] Further, each sleeve unit segment is composed of high-performance concrete and a steel skeleton.

[0007] Further, the concave-convex splicing structure between the bottom sleeve unit segment and the middle sleeve unit segment is composed of a convex structure arranged at the lower end of the middle sleeve unit segment and a concave structure arranged at the upper end of the bottom sleeve unit segment; the concave-convex splicing structure between the middle sleeve unit segment and the top sleeve unit segment is composed of a convex structure arranged at the lower end of the top sleeve unit segment and a concave structure arranged at the upper end of the middle sleeve unit segment.

[0008] Further, the convex structure is a toothed steel ring, and the lower end of the top sleeve unit segment and the lower end of the middle sleeve unit segment are respectively pre-buried with the toothed steel ring; the concave structure is an annular steel groove, and the upper end of the middle sleeve unit segment and the upper end of the bottom sleeve unit segment are both pre-buried with the annular steel groove.

[0009] Further, the toothed steel ring is provided with a plurality of convex teeth in the circumferential direction, and the annular steel groove is provided with a plurality of concave grooves in the circumferential direction, and the bottom of the concave groove is provided with an opening.

[0010] Further, the width of the concave groove is greater than the thickness of the convex tooth, and the depth of the concave groove is greater than the height of the convex tooth.

[0011] Further, the steel framework of the bottom sleeve unit segment is composed of an annular channel steel and a steel reinforcement cage; the steel framework of the middle sleeve unit segment is composed of an annular channel steel, a steel reinforcement cage and a toothed steel ring; and the steel framework of the top sleeve unit segment is composed of a steel reinforcement cage and a toothed steel ring.

[0012] Further, the steel reinforcement cage of the bottom sleeve unit segment and the middle sleeve unit segment is provided with a thread at the upper end of the steel reinforcement cage, and a nut is fixedly sleeved on each longitudinal reinforcement of the steel reinforcement cage at the same distance from the top end of the steel reinforcement cage; the upper part of the steel reinforcement cage of the bottom sleeve unit segment and the middle sleeve unit segment and the bottom of the annular steel groove are bolted through the nut on the longitudinal reinforcement and the nut arranged in the annular steel groove; and the lower part of the steel reinforcement cage of the middle sleeve unit segment and the top sleeve unit segment is welded with the toothed steel ring.

[0013] Further, the annular steel groove and the toothed steel ring are made of stainless steel.

[0014] A construction method applied to a seawater-sea sand concrete combined column, comprising the following steps:

[0015] 1) Preparing each sleeve unit segment in a factory:

[0016] ① Middle sleeve unit segment: placing a toothed steel ring at the bottom of the mold of the middle sleeve unit segment, welding a steel reinforcement cage on the toothed steel ring, passing an annular steel groove through the upper threaded steel reinforcement of the steel reinforcement cage and anchoring with a nut; after the formwork is erected, pouring high-performance concrete into the mold through the gap between the annular steel groove and the mold;

[0017] 2) the bottom sleeve unit segment is placed at the pre-installation site by hoisting equipment and fixed, the upper end plane of the bottom sleeve unit segment is checked to be horizontal, the high-performance concrete grouting material is filled in the annular steel groove at the upper end of the bottom sleeve unit segment after the confirmation, the middle sleeve unit segment is hoisted to above the bottom sleeve unit segment and placed downward, the protruding parts of the toothed steel ring of the middle sleeve unit segment are accurately connected into the annular groove steel slotting part of the bottom sleeve unit segment, the high-performance concrete grouting material in the groove of the annular groove steel is extruded and overflowed to the outside, the connection part is compacted, the middle sleeve unit segment is spliced, and several middle sleeve unit segments are spliced; finally, the top sleeve unit segment is spliced, and the fabricated construction of the high-performance steel reinforced concrete sleeve of the column is completed;

[0018] 3) when the high-performance concrete sleeve is assembled, seawater and sand concrete is poured in the high-performance concrete sleeve until the column body is filled, and the seawater and sand concrete filling layer is formed after the seawater and sand concrete is solidified, and finally the construction of the seawater and sand concrete composite column is completed.

[0019] 2) the bottom sleeve unit segment is placed at the pre-installation site by hoisting equipment and fixed, the upper end plane of the bottom sleeve unit segment is checked to be horizontal, the high-performance concrete grouting material is filled in the annular steel groove at the upper end of the bottom sleeve unit segment after the confirmation, the middle sleeve unit segment is hoisted to above the bottom sleeve unit segment and placed downward, the protruding parts of the toothed steel ring of the middle sleeve unit segment are accurately connected into the annular groove steel slotting part of the bottom sleeve unit segment, the high-performance concrete grouting material in the groove of the annular groove steel is extruded and overflowed to the outside, the connection part is compacted, the middle sleeve unit segment is spliced, and several middle sleeve unit segments are spliced; finally, the top sleeve unit segment is spliced, and the fabricated construction of the high-performance steel reinforced concrete sleeve of the column is completed;

[0020] 3) when the high-performance concrete sleeve is assembled, seawater and sand concrete is poured in the high-performance concrete sleeve until the column body is filled, and the seawater and sand concrete filling layer is formed after the seawater and sand concrete is solidified, and finally the construction of the seawater and sand concrete composite column is completed.

[0021] Compared with the prior art, the present application has the following advantages:

[0022] 1) the column body is divided into an external high-performance steel reinforced concrete sleeve and an internal seawater and sand concrete filling layer, the external sleeve is divided into unit segments and processed in a factory in advance, and then transported to the site for assembly, the process is convenient, the size selection is flexible, the assembly process is simple, the high-performance concrete sleeve can effectively prevent the corrosion of chloride ions existing in the external marine environment and the internal seawater and sand concrete on the steel material in the sleeve, improve the durability and service life of the structure, and the internal seawater and sand concrete can better utilize marine resources to reduce the material cost of traditional building materials.

[0023] 2) In this invention, the connecting areas of the unit segments are interconnected using stainless steel toothed steel rings and stainless steel annular steel channels, and are compacted using high-performance concrete grout. The upper toothed steel ring and lower annular steel channel within the unit segment are connected by a reinforcing cage and bolts. There are multiple paths for chloride ions present in the external ocean and seawater sand concrete to corrode the steel inside the casing. The two most representative forms are: ① The first is the corrosion path of "high-performance reinforced concrete → reinforcing steel," which is the shortest path, but chloride ions have great difficulty corroding high-performance concrete; therefore, the casing provides good protection in this path. ② The second is "joint → stainless steel → high-performance concrete grout → toothed steel ring," which bypasses the protective function of the casing, but the path is longer, effectively reducing the chloride ion corrosion efficiency. In summary, this unit segment splicing method can effectively mitigate the corrosion effect of chloride ions and improve the corrosion resistance of the component connection area.

[0024] 3) The present invention effectively transmits the load of the bridge deck at the top of the column downward through the force transmission path of "reinforcing cage → toothed steel ring → annular steel channel → reinforcing cage". When the concrete at the connection is under pressure, it is supported by the reinforcing cage. When under tension, the grouting material anchors the toothed steel ring and the annular steel channel to prevent the connection from separating. This force mechanism can effectively ensure the load-bearing stability of the bridge structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the seawater and sea sand concrete composite column structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of each sleeve unit segment of the present invention;

[0027] Figure 3 The internal steel skeleton of each sleeve unit segment of the present invention;

[0028] Figure 4 This is a schematic diagram of the toothed steel ring structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the annular steel groove structure of the present invention;

[0030] Figure 6 This is a top view of the sleeve structure of the present invention;

[0031] Figure 7 For the present invention Figure 6 AA section view;

[0032] Figure 8 For the present invention Figure 7 A schematic diagram of the structure of area B before splicing;

[0033] Figure 9 For the present invention Figure 7The structure schematic diagram of B area before and after splicing of the application;

[0034] Figure 10 The schematic diagram of main path of chloride ion erosion of the application;

[0035] In the figure: 1~high-performance reinforced concrete sleeve; 11~steel cage; 2~seawater sea sand concrete filling layer; 3~sleeve unit segment; 31~bottom sleeve unit segment; 31~middle sleeve unit segment; 33~top sleeve unit segment; 4~toothed steel ring; 41~tooth; 5~annular steel groove; 51~groove; 6~nut; 7~high-performance concrete grouting material. DETAILED DESCRIPTION

[0036] In order to make the above features and advantages of the application more apparent, the following specific examples are given, and the detailed description is made below with reference to the accompanying drawings, but the application is not limited thereto.

[0037] REFERENCE Figures 1 to 10

[0038] A seawater sea sand concrete composite column comprises a high-performance reinforced concrete sleeve 1 located at the outside, and a seawater sea sand concrete filling layer 2 is arranged in the high-performance reinforced concrete sleeve; the high-performance reinforced concrete sleeve is spliced by a plurality of high-performance reinforced concrete sleeve unit segments 3, and comprises a bottom sleeve unit segment 31, N middle sleeve unit segments 32 and a top sleeve unit segment 33, N≥0, and N is a natural number; each sleeve unit segment is prefabricated in a factory, assembled on site, used as a concrete pouring formwork, and then the internal seawater sea sand concrete is poured to form the seawater sea sand concrete composite column. The upper end of the bottom sleeve unit segment and the lower end of the middle sleeve unit segment and the upper end of the middle sleeve unit segment and the lower end of the top sleeve unit segment are all provided with matched concave-convex splicing structures, so as to form the high-performance reinforced concrete sleeve. Or when N is equal to 0, the lower end of the top sleeve unit segment and the upper end of the bottom sleeve unit segment can also form the matched concave-convex splicing structure.

[0039] In the embodiment, each sleeve unit segment is composed of high-performance concrete and a steel framework.

[0040] In the embodiment, the concave-convex splicing structure between the bottom sleeve unit segment and the middle sleeve unit segment is composed of a convex structure arranged at the lower end of the middle sleeve unit segment and a concave structure arranged at the upper end of the bottom sleeve unit segment; the concave-convex splicing structure between the middle sleeve unit segment and the top sleeve unit segment is composed of a convex structure arranged at the lower end of the top sleeve unit segment and a concave structure arranged at the upper end of the middle sleeve unit segment. When N is equal to 0, the concave-convex splicing structure is composed of a convex structure arranged at the lower end of the top sleeve unit segment and a concave structure arranged at the upper end of the bottom sleeve unit segment.

[0041] In this embodiment, the convex structure is a toothed steel ring 4, which has a plurality of convex teeth 41 spaced apart along the circumferential direction. The lower end of the top sleeve unit section and the lower end of the middle sleeve unit section are respectively embedded with toothed steel rings. The concave structure is an annular steel groove 5, which has a plurality of grooves 51 correspondingly arranged along the circumferential direction. The grooves are of equal size, and the bottom of the grooves is provided with an opening with a diameter slightly larger than the diameter of the longitudinal reinforcement of the steel cage. The upper end of the middle sleeve unit section and the upper end of the bottom sleeve unit section are both embedded with annular steel grooves.

[0042] In this embodiment, the width of the groove is slightly greater than the thickness of the protruding tooth, and the depth of the groove is slightly greater than the height of the protruding tooth. During splicing, high-performance concrete grout 7 is injected into the groove and fills the surface of the annular steel groove. The protruding tooth of the toothed steel ring is inserted into the annular steel groove. The high-performance concrete grout overflows from the groove and fills the gap at the connection part.

[0043] In this embodiment, the steel frame of the bottom sleeve unit section is composed of annular channel steel 5 and reinforcing cage 11; the steel frame of the middle sleeve unit section is composed of annular channel steel 5, reinforcing cage 11 and toothed steel ring 4; and the steel frame of the top sleeve unit section is composed of reinforcing cage 11 and toothed steel ring 4.

[0044] In this embodiment, the ends of the reinforcing bars above the reinforcing cage of the bottom sleeve unit section and the middle sleeve unit section are threaded, and each longitudinal bar of the reinforcing cage is fixedly fitted with a nut at the same distance from the top of the reinforcing cage (the upper part of the longitudinal bar is threaded with a nut); the upper part of the reinforcing cage of the bottom sleeve unit section and the middle sleeve unit section and the bottom of the annular steel trough are bolted together with the nuts 6 set in the groove of the annular steel trough through the nuts on the longitudinal bars (that is, the threaded part of the longitudinal bar passes through the opening and is screwed to the nut in the groove); the lower part of the reinforcing cage of the middle sleeve unit section and the top sleeve unit section is welded to the toothed steel ring.

[0045] In this embodiment, the annular steel groove and the toothed steel ring are made of stainless steel.

[0046] A construction method for seawater-sand-concrete composite columns includes the following steps:

[0047] 1) Prefabricate each casing unit segment in the factory:

[0048] ① Middle sleeve unit segment 32: Place the toothed steel ring 4 at the bottom of the mold of the middle sleeve unit segment, weld the steel cage 11 on the toothed steel ring, pass the annular steel groove 5 through the threaded steel bar at the top of the steel cage, and anchor it with the nut 6; after the formwork is erected, pour high-performance concrete into the mold through the gap between the annular steel groove 5 and the mold.

[0049] ② Bottom sleeve unit section 31: Change the style of the lower template of the bottom sleeve unit section 31, place the steel cage 11 in the mold of the bottom sleeve unit section 31, pour high-performance concrete, pass the annular steel channel 5 through the threaded steel bar at the top of the steel cage 11, and anchor it with nut 6.

[0050] ③ Top sleeve unit segment 33: The lower part of the top sleeve unit segment 33 is the same as the lower part of the middle sleeve unit segment 32. The toothed steel ring 4 is placed at the bottom of the mold of the top sleeve unit segment 33. After welding the steel cage 11 on the upper part of the toothed steel ring 4, high-performance concrete is poured.

[0051] After the high-performance concrete has been cured, the steel frame construction of each casing unit section is completed.

[0052] 2) First, place and fix the bottom sleeve unit segment 31 at the pre-installation location using hoisting equipment. Check whether the upper plane of the bottom sleeve unit segment 31 is level. After confirming that it is level, fill the annular steel groove 5 at the upper end of the bottom sleeve unit segment 31 with high-performance concrete grouting material 7. Hoist the middle sleeve unit segment 32 above the bottom sleeve unit segment 31 and place it downwards, ensuring that the protrusions of the toothed steel ring 4 of the middle sleeve unit segment 32 are accurately engaged in the grooves of the annular channel steel 5 of the bottom sleeve unit segment 31. The high-performance concrete grout 7 is squeezed and overflows to the outside, achieving compaction at the joint, completing the splicing of the middle sleeve unit segment 32 and the bottom sleeve unit segment, and splicing several middle sleeve unit segments 32. The splicing method of two adjacent middle sleeve unit segments 32 is the same as the splicing method between the bottom sleeve unit segment 31 and the middle sleeve unit segment 32. Finally, the top sleeve unit segment 33 is spliced ​​at the upper end of the uppermost middle sleeve unit segment 32, completing the prefabricated construction of the column high-performance reinforced concrete sleeve 1.

[0053] 3) After the high-performance concrete sleeve is assembled, seawater sand concrete is poured into the inside of the high-performance concrete sleeve until the column is filled. After the seawater sand concrete solidifies, the seawater sand concrete filling layer 2 is formed, and the construction of the seawater sand concrete composite column is finally completed.

[0054] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of seawater and sea sand concrete composite columns and their construction methods according to the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A seawater sea sand concrete composite column, characterized by, The application relates to a high-performance reinforced concrete sleeve located outside and filled with seawater-sea sand concrete, which is composed of a plurality of high-performance reinforced concrete sleeve unit segments, including a bottom sleeve unit segment, N middle sleeve unit segments and a top sleeve unit segment, wherein N>=0; a concave-convex splicing structure is arranged between the upper end of the bottom sleeve unit segment and the lower end of the middle sleeve unit segment and between the upper end of the middle sleeve unit segment and the lower end of the top sleeve unit segment; the concave-convex splicing structure between the bottom sleeve unit segment and the middle sleeve unit segment is composed of a convex structure arranged at the lower end of the middle sleeve unit segment and a concave structure arranged at the upper end of the bottom sleeve unit segment; the concave-convex splicing structure between the middle sleeve unit segment and the top sleeve unit segment is composed of a convex structure arranged at the lower end of the top sleeve unit segment and a concave structure arranged at the upper end of the middle sleeve unit segment; the convex structure is a toothed steel ring, the lower end of the top sleeve unit segment and the lower end of the middle sleeve unit segment are respectively pre-buried with toothed steel rings, a plurality of convex teeth are arranged in the circumferential direction of the toothed steel ring, the concave structure is an annular steel groove, the upper end of the middle sleeve unit segment and the upper end of the bottom sleeve unit segment are respectively pre-buried with annular steel grooves, a plurality of concave grooves are arranged in the circumferential direction of the annular steel groove, and the bottom of the concave groove is provided with an opening; the steel framework of the bottom sleeve unit segment is composed of an annular channel steel and a steel reinforcement cage; the steel framework of the middle sleeve unit segment is composed of an annular channel steel, a steel reinforcement cage and a toothed steel ring; the steel framework of the top sleeve unit segment is composed of a steel reinforcement cage and a toothed steel ring; the upper end of the steel reinforcement cage of the bottom sleeve unit segment and the middle sleeve unit segment is provided with a thread, and a screw cap is fixedly sleeved on the upper end of each longitudinal reinforcement of the steel reinforcement cage at the same distance; the upper part of the steel reinforcement cage of the bottom sleeve unit segment and the middle sleeve unit segment and the bottom of the annular steel groove are bolt-connected through the screw cap on the longitudinal reinforcement and the screw cap arranged in the annular steel groove; and the lower part of the steel reinforcement cage of the middle sleeve unit segment and the top sleeve unit segment is welded with the toothed steel ring.

2. A seawater-sea sand concrete composite column according to claim 1, characterized in that, Each sleeve unit segment is composed of high-performance concrete and a steel framework.

3. A seawater-sea sand concrete composite column according to claim 1, characterized in that, The width of the concave groove is greater than the thickness of the convex tooth, and the depth of the concave groove is greater than the height of the convex tooth.

4. The seawater-sea sand concrete composite column according to claim 1 or 3, characterized in that, The annular steel groove and the toothed steel ring are made of stainless steel.

5. A method for constructing a seawater-sea sand concrete composite column according to claim 1, characterized in that, The application comprises the following steps: 1) prefabricating each sleeve unit segment in a factory: ① middle sleeve unit segment: placing a toothed steel ring at the bottom of a mold of the middle sleeve unit segment, welding a steel reinforcement cage on the toothed steel ring, passing an annular steel groove through the upper threaded steel reinforcement of the steel reinforcement cage and anchoring the annular steel groove with a screw cap, pouring high-performance concrete into the mold through the gap between the annular steel groove and the mold after supporting the mold; ② bottom sleeve unit segment: placing a steel reinforcement cage in a mold of the bottom sleeve unit segment and pouring high-performance concrete, passing an annular steel groove through the upper threaded steel reinforcement of the steel reinforcement cage and anchoring the annular steel groove with a screw cap; ③Top sleeve unit segment: the lower part of the top sleeve unit segment is the same as the lower part of the middle sleeve unit segment. A toothed steel ring is placed at the bottom of the mold of the top sleeve unit segment. After the steel reinforcement cage is welded on the upper part of the toothed steel ring, high-performance concrete is poured; 2) First, place the bottom sleeve unit segment at the pre-installation site by hoisting equipment and fix it. Check whether the upper end plane of the bottom sleeve unit segment is horizontal. After confirming that there is no error, fill the annular steel groove at the upper end of the bottom sleeve unit segment with high-performance concrete grouting material. Hoist the middle sleeve unit segment above the bottom sleeve unit segment and place it downward, ensuring that the protruding parts of the toothed steel ring of the middle sleeve unit segment accurately enter the slotted part of the annular groove steel of the bottom sleeve unit segment. The high-performance concrete grouting material in the groove of the annular groove steel is extruded outward, realizing the compaction of the connection part, completing the splicing of the middle sleeve unit segment, and splicing several middle sleeve unit segments. Finally, splice the top sleeve unit segment to complete the fabricated construction of the high-performance reinforced concrete sleeve of the column; 3) After the high-performance concrete sleeve is assembled, pour seawater and sea sand concrete in the interior of the high-performance concrete sleeve until the column body is filled. After the seawater and sea sand concrete solidifies, a seawater and sea sand concrete filling layer is formed, and the construction of the seawater and sea sand concrete composite column is finally completed.

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