CN110700488A

CN110700488A - Steel pipe rockfill concrete structure and construction method thereof

Info

Publication number: CN110700488A
Application number: CN201910920122.5A
Authority: CN
Inventors: 邱流潮; 田雷; 李敬军; 杨永森
Original assignee: China Agricultural University
Current assignee: China Agricultural University
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-01-17

Abstract

The invention relates to the technical field of constructional engineering, and provides a steel tube rockfill concrete structure and a construction method thereof, wherein the steel tube rockfill concrete structure comprises steel tubes, stones and self-compacting concrete; the stone is filled in the steel pipe, and the self-compacting concrete is filled between gaps formed by the stone. According to the steel pipe rockfill concrete structure, natural stones are used as main fillers, self-compacting concrete with high fluidity and strong segregation resistance is used for filling gaps among the stones in an auxiliary mode, and on the premise that the overall structural strength is guaranteed, the consumption of the concrete is effectively reduced, and the construction cost is reduced; meanwhile, when the self-compacting concrete is filled, vibration is not needed, so that the construction process is simplified, and the construction progress is accelerated.

Description

Steel pipe rockfill concrete structure and construction method thereof

Technical Field

The invention relates to the technical field of constructional engineering, in particular to a steel pipe rockfill concrete structure and a construction method thereof.

Background

The concrete-filled steel tube is a novel concrete-filled steel tube material formed by pouring concrete into a cavity of a steel tube. Concrete-filled steel tubes can be divided into round steel tube concrete, square steel tube concrete and polygonal steel tube concrete according to the difference of the cross-sectional shapes of the steel tubes, wherein the round steel tube concrete and the square steel tube concrete are most commonly used. Concrete-filled steel tubes have unique advantages over traditional concrete and reinforced concrete. The steel pipe concrete combines the good bending resistance and elastic plasticity of the steel pipe with the good compression resistance of the concrete, and the compression resistance and the deformation resistance of the concrete core are further enhanced under the action of the hoop of the steel pipe, so that the steel pipe concrete structure has excellent mechanical properties. In addition, the steel pipe can be directly used as a template in the construction process, so that the material is saved, the construction procedure is simplified, and the construction progress is accelerated.

But to the great steel pipe concrete structure of volume, the concrete volume that needs is great, has increased construction cost, and simultaneously, the increase of cement demand volume inevitably leads to cement supply volume to increase, and the production of cement belongs to the high pollution trade, consumes cement in a large number, is unfavorable for green.

Disclosure of Invention

Technical problem to be solved

The invention provides a steel pipe rockfill concrete structure and a construction method thereof, which aim to solve the technical problem that the steel pipe concrete structure in the prior art consumes large concrete.

(II) technical scheme

In order to solve the technical problem, an embodiment of the present invention provides a steel tube rockfill concrete structure, which includes a steel tube, and further includes stones and self-compacting concrete; the stone is filled in the steel pipe, and the self-compacting concrete is filled between gaps formed by the stone.

Wherein the minimum grain size of the stone blocks is more than or equal to five times of the maximum grain size of coarse aggregate in the self-compacting concrete.

Wherein the particle size of the stone is 15-200 cm; the maximum grain size of the coarse aggregate in the self-compacting concrete is not more than 25 mm.

Wherein the slump of the concrete is not less than 255mm, the slump expansion is 550-750mm, and the outflow time of the V-shaped funnel is 7-30 s.

Wherein, the cross-sectional shape of steel pipe includes circular, rectangle and polygon.

The embodiment of the invention also provides a construction method of the steel pipe rockfill concrete structure, which comprises the following steps: s10, fixing the steel tube at the target position; s20, filling stones with preset height into the steel pipe; and S30, pouring self-compacting concrete into the steel pipe, and filling gaps among the stones.

Wherein, in step S20, the height of the single filling stone block is not more than 2 m.

Wherein, in step S30, the height of the single-time pouring of the self-compacting concrete is 300mm from the top surface of the block.

Wherein, when a plurality of steel pipes are needed to be spliced, the height of the stone filled for the last time is 300-500mm away from the top of the steel pipe.

(III) advantageous effects

According to the steel pipe rockfill concrete structure, natural stones are used as main fillers, self-compacting concrete with high fluidity and strong segregation resistance is used for filling gaps among the stones in an auxiliary mode, and on the premise that the overall structural strength is guaranteed, the consumption of the concrete is effectively reduced, and the construction cost is reduced; meanwhile, when the self-compacting concrete is filled, vibration is not needed, so that the construction process is simplified, and the construction progress is accelerated.

Drawings

FIG. 1 is a schematic structural view of a single steel pipe in an embodiment of the steel pipe rockfill concrete structure provided by the present invention;

FIG. 2 is a schematic structural view of a plurality of steel pipes in one embodiment of the steel pipe rockfill concrete structure provided by the present invention;

FIG. 3 is a cross-sectional view of one embodiment of a steel pipe rockfill concrete structure provided by the present invention;

FIG. 4 is a top view of one embodiment of a steel pipe rockfill concrete structure provided by the present invention;

in the figure, 1-steel pipe; 2-stone blocks; 3-self-compacting concrete.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, 3 and 4, the embodiment of the present invention provides a steel pipe rockfill concrete structure, which includes a steel pipe 1, a stone block 2 and self-compacting concrete 3; the stone blocks 2 are filled in the steel pipes 1, and the self-compacting concrete 3 is filled between gaps formed by the stone blocks 2.

Specifically, for example, the steel pipe 1 may be a steel pipe 1 having a circular cross section, in which case the diameter of the steel pipe 1 is larger than 1m, the side length of the steel pipe 1 is larger than 1m for a steel pipe 1 having a square cross section, and the distance between opposite sides of the steel pipe 1 is larger than 1m for a steel pipe 1 having a polygonal cross section; the particle size of stone 2 can be selected according to the actual size of steel pipe 1, prepares the self-compaction concrete 3 of suitable aggregate particle size according to the particle size of selected stone 2 again simultaneously to ensure to pack the gap between stone 2 and between stone 2 and steel pipe 1.

According to the steel pipe rockfill concrete structure, the natural stones 2 are used as main fillers, and the self-compacting concrete 3 with high fluidity and strong segregation resistance is used for filling gaps among the stones in an auxiliary mode, so that the consumption of the self-compacting concrete 3 is effectively reduced and the construction cost is reduced on the premise of ensuring the strength of the whole structure; meanwhile, when the self-compacting concrete 3 is filled, vibration is not needed, so that the construction process is simplified, and the construction progress is accelerated.

Further, the minimum grain size of the stone blocks 2 is greater than or equal to five times the maximum grain size of the coarse aggregates in the self-compacting concrete 3.

Further, the particle size of the stone block 2 is 15-200 cm; the maximum grain size of the coarse aggregate in the self-compacting concrete 3 is not more than 25 mm. Specifically, for example, the stone blocks 2 may have a grain size of 20cm, 50cm, 100cm, etc., and the corresponding coarse aggregate in the self-compacting concrete 3 may have a maximum grain size of 5mm, 10mm, and 20mm, for obtaining an optimal caulking effect.

Further, the slump of the self-compacting concrete 3 is not less than 255mm, the slump expansion is 550-750mm, and the outflow time of the V-shaped funnel is 7-30 s. Specifically, for example, the slump of the self-compacting concrete 3 may be 300mm, the slump expansion may be 600mm, and the outflow time of the V-shaped funnel may be 15s, which is beneficial to naturally filling up the gap of the self-compacting concrete 3 by gravity after the self-compacting concrete 3 is poured, and does not need to be vibrated, thereby facilitating the simplification of the construction process and the acceleration of the construction progress; meanwhile, the self-compacting concrete 3 can be ensured to have certain viscosity, so that the strength requirement can be met after the mixed stone 2 and the self-compacting concrete 3 are solidified.

Further, the sectional shape of the steel pipe 1 includes a circle, a rectangle, and a polygon.

The embodiment of the invention also provides a construction method of the steel pipe rockfill concrete structure, which comprises the following steps: s10, fixing the steel pipe 1 at the target position; s20, filling the stone blocks 2 with preset height into the steel pipe 1; and S30, pouring the self-compacting concrete 3 into the steel pipe 1, and filling gaps among the stones 2.

Specifically, for example, a steel pipe 1 with a proper pipe diameter and a proper pipe length is selected according to a construction environment and a construction requirement, the steel pipe 1 is vertically placed, the steel pipe 1 can be fixed in a pre-buried or welding mode, then stones 2 with a preset height, for example, stones 2 with a height of 1m, are added into the steel pipe 1, then self-compacting concrete 3 is prepared and added into the steel pipe 1 after being inspected to be qualified, for example, the addition can be stopped when the self-compacting concrete 3 is 200mm away from the top surface of the stones 2, the steps are repeated until the whole steel pipe 1 is filled, and if the steel pipe 1 needs to be lengthened, the stones 2 or the self-compacting concrete 3 can be continuously added after splicing; if the self-compacting concrete 3 is not required to be lengthened, the self-compacting concrete 3 and the stone block 2 are completely solidified; thereafter, the orientation of the steel pipe 1 can be adjusted according to the application and the application.

Further, in step S20, the height of the single fill stone block 2 does not exceed 2 m. For example, the height of the single filling can be 0.5m, 1m, 1.5m, etc., which is beneficial to completely fill the gap when filling the self-compacting concrete 3, so as to improve the strength of the whole structure.

Further, in step S30, the height of the single pour of the self-compacting concrete 3 is 300mm from the top surface 100 of the block 2. Specifically, for example, the height of the single-pouring self-compacting concrete 3 may be 150mm, 200mm, 250mm, etc. from the top surface of the block 2, so as to facilitate the close combination between the self-compacting concrete 3 poured next time and the self-compacting concrete 3 poured last time, thereby preventing the occurrence of through cold gaps.

As shown in fig. 2, further, when a plurality of steel pipes 1 are required to be spliced, the height of the stone block 2 filled for the last time is 300-500mm from the top of the steel pipe 1. In particular, for example, the height of the last filled stone block 2 can be 350mm, 400mm and 450mm from the top of the steel tube 1, so arranged that, on the one hand, the steel tube 1 is extended to run out of the space for splicing, while also facilitating a better interface of the stone block 2 and the self-compacting concrete 3 in the next section of steel tube 1 with the stone block 2 and the self-compacting concrete 3 in the previous section of steel tube 1.

The embodiment shows that the steel pipe rockfill concrete structure and the construction method thereof provided by the invention have the following beneficial effects:

the invention uses natural stone blocks to replace partial concrete, and the volume of the stone blocks can reach half of the volume of the steel tube cavity, thereby greatly reducing the consumption of concrete, reducing the economic cost and meeting the requirement of green sustainable development.

2, the invention fills the gap between the stone block and the steel pipe with the concrete which has high fluidity, strong segregation resistance and vibration-free self-compaction, greatly simplifies the construction process and accelerates the construction progress.

3, the mixed structure composed of the stones and the concrete has excellent mechanical property and integrity, and the mixed structure and the steel pipe jointly form the steel pipe rock-fill concrete.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A steel tube rockfill concrete structure comprises a steel tube, and is characterized by also comprising stones and self-compacting concrete;

the stone is filled in the steel pipe, and the self-compacting concrete is filled between gaps formed by the stone.

2. The steel pipe rockfill concrete structure according to claim 1, wherein the minimum particle size of the stone blocks is greater than or equal to five times the maximum particle size of coarse aggregates in the self-compacting concrete.

3. The steel pipe rockfill concrete structure according to claim 1, wherein the stone blocks have a particle size of 15 to 200 cm;

the maximum grain size of the coarse aggregate in the self-compacting concrete is not more than 25 mm.

4. The steel pipe rockfill concrete structure according to claim 1, wherein the slump of the self-compacting concrete is not less than 255mm, the slump expansion is 550-750mm, and the outflow time of the V-shaped funnel is 7-30 s.

5. The steel pipe rockfill concrete structure according to claim 1, wherein the cross-sectional shape of the steel pipe includes a circle, a rectangle, and a polygon.

6. A construction method of a steel pipe rockfill concrete structure according to any one of claims 1 to 5, comprising:

s10, fixing the steel tube at the target position;

s20, filling stones with preset height into the steel pipe;

and S30, pouring self-compacting concrete into the steel pipe, and filling gaps among the stones.

7. The construction method of a steel pipe rockfill concrete structure according to claim 6, wherein in step S20, the height of the block of stone is filled at a single time not more than 2 m.

8. The method for constructing a steel pipe rockfill concrete structure according to claim 6, wherein in step S30, the height of the single pour of the self-compacting concrete is 100-300mm from the top surface of the block.

9. The construction method of the steel pipe rockfill concrete structure according to claim 6, wherein when a plurality of steel pipes are required to be spliced, the height of the stone block filled for the last time is 300-500mm from the top of the steel pipe.