CN114704030B - Prefabricated steel pipe column applied to roof system, pouring method of prefabricated steel pipe column and concrete - Google Patents
Prefabricated steel pipe column applied to roof system, pouring method of prefabricated steel pipe column and concrete Download PDFInfo
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- CN114704030B CN114704030B CN202210177009.4A CN202210177009A CN114704030B CN 114704030 B CN114704030 B CN 114704030B CN 202210177009 A CN202210177009 A CN 202210177009A CN 114704030 B CN114704030 B CN 114704030B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 149
- 239000010959 steel Substances 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000004567 concrete Substances 0.000 title abstract description 74
- 239000011376 self-consolidating concrete Substances 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 8
- 239000008397 galvanized steel Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000011863 silicon-based powder Substances 0.000 claims description 4
- 230000008961 swelling Effects 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 2
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000005204 segregation Methods 0.000 description 9
- 238000005056 compaction Methods 0.000 description 6
- 230000008602 contraction Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011381 foam concrete Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a prefabricated steel pipe column applied to a roof system, a pouring method thereof and concrete, and the technical field of building construction, comprising a steel pipe column body, a plurality of ring plates and a string pipe, wherein the ring plates are sequentially arranged along the length direction of the inner side of the steel pipe column body; the lower end of the string pipe extends into the steel pipe column body and is fixedly connected with the steel pipe column body; the lower end part of the string pipe is positioned between the ring plate at the lowest part of the steel pipe column body and the bottom of the steel pipe column body; the upper end of the string pipe extends out of the upper end of the steel pipe column body. By adopting the scheme, when the depth of the steel pipe column body is too large, concrete is poured into the steel pipe column body through the string pipe, so that backflow is formed, the poured concrete can be prevented from being isolated, and the concrete in the column is full and compact.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a prefabricated steel pipe column applied to a roof system, a pouring method of the prefabricated steel pipe column and concrete.
Background
The steel pipe concrete column is a supporting structure of a roof system, 164 steel pipe concrete columns are arranged on a certain T2 station building and comprise two forms of vertical columns and inclined columns, wherein the outdoor steel pipe concrete column on the outer side of the structure is an inclined column, and the inclined angle is in three forms of 8 degrees, 10 degrees and 14 degrees; and C50 self-compacting concrete or foam concrete is poured into the steel pipe column at the top elevation of the steel pipe concrete column of the T2 terminal building roof of 14.206-39.177 m. But to the pouring of vertical post and inclined post, because steel-pipe column degree of depth is too big, and inside is equipped with a plurality of steel construction annular plates, in concrete placement process, can appear following several problems: 1. the concrete is very difficult to vibrate and compact; 2. the concrete pouring mode of the pipe column has close relation with the hoisting mode of the steel structure, the steel pipe column is hoisted in sections, the concrete is hoisted in sections, the hoisting height of part of the steel pipe column is larger at one time, the concrete is easily separated due to the fact that the height limit of the self-compacting concrete pouring is exceeded; 3. the concrete is easy to separate from the steel pipe column wall due to thermal expansion and cold contraction of the concrete.
Disclosure of Invention
The invention aims to provide a prefabricated steel pipe column applied to a roof system, a pouring method thereof and concrete.
The invention is realized by the following technical scheme:
the prefabricated steel pipe column comprises a steel pipe column body, wherein a plurality of annular plates are sequentially arranged along the length direction of the inner side of the steel pipe column body, and the prefabricated steel pipe column further comprises a string pipe;
the lower end of the string pipe extends into the steel pipe column body and is fixedly connected with the steel pipe column body; the lower end part of the string pipe is positioned between the ring plate at the lowest part of the steel pipe column body and the bottom of the steel pipe column body; the upper end of the string pipe extends out of the upper end of the steel pipe column body.
Compared with the prior art, because the steel pipe column is too large in depth and is internally provided with a plurality of steel structure annular plates, in the concrete pouring process, concrete is very difficult to vibrate and compact, and the problem that concrete segregation is easy to cause is solved by exceeding the self-compact concrete pouring height limit; specifically, a plurality of annular plates are sequentially arranged on the inner side length direction of the steel pipe column body, and the steel pipe column is in a conventional structural form of the existing steel pipe column, in the invention, a string pipe is arranged in the steel pipe column body, wherein the length of the string pipe is matched with that of the steel pipe column body, the lower end part of the string pipe is close to the bottom of the steel pipe column body and is preferably positioned 5m above the last concrete finishing surface elevation, but the lower end of the string pipe is required to be positioned below the annular plate at the lowest end in the steel pipe column body, so that pouring is finished in a backflow mode, and concrete segregation is avoided from being formed below the annular plate at the lowest end; the upper end of the string pipe is required to exceed the upper end of the steel pipe column body, and is preferably beyond the position 0.5m above the elevation of the upper end of the steel pipe column body; the diameter of the string pipe is far smaller than the inner diameter of the annular plate, so that the string pipe does not influence the pouring compactness of self-compacting concrete, and the string pipe is parallel to the steel pipe column body, so that the pouring stability of the string pipe to the concrete is higher; after the steel pipe column is installed, pouring self-compacting concrete at the upper end of the string pipe through a pump pipe, flowing out from the lower end of the string pipe to form backward flow until the upper end of the string pipe cannot continue to discharge, then directly pouring the pump pipe into the steel pipe column body by 2 to 3 meters, continuously pouring the concrete to a designed elevation, and vibrating a vibrating rod into the steel pipe if the condition exists after the self-compacting concrete is poured to the designed elevation, so that the pouring quality of the self-compacting concrete is further ensured; the pouring of self-compaction concrete is completed, the concrete is poured into the steel pipe column body through the string pipe, the reverse pouring is formed, the poured concrete can be prevented from segregation, and the concrete in the column is full and compact.
Further optimizing, the string pipe is fixedly connected with the steel pipe column body through a fixing device; the fixing device comprises a connecting rod and clamping blocks, a through hole is formed in the side wall of the string pipe, one end of the connecting rod is fixedly connected with the steel pipe column body, the other end of the connecting rod stretches into the through hole, the other end of the connecting rod is provided with two clamping blocks, and the two clamping blocks are respectively arranged on the inner side and the outer side of the side wall of the string pipe and clamp the side wall of the string pipe; the connecting structure is used for improving the connecting strength between the string pipe and the steel pipe column body and improving the pouring stability.
Further preferably, the fixing device further comprises bolts, and screw holes matched with the bolts are formed in the two clamping blocks and the serial pipe; for providing a stable clamping force.
Further preferably, a fixing device is arranged between two adjacent annular plates; because the lengths of the string pipe and the steel pipe column body are large, the string pipe and the steel pipe column body are used for forming stable connection.
Further optimizing, wherein the serial pipes are hot dip galvanized steel pipes; for preventing separation between the self-compacting concrete and the string pipe.
Further preferably, the through hole is a strip hole, the strip hole can be penetrated by the fixing device, and the length of the strip hole is larger than the height of the fixing device; the device is used for facilitating the installation of the string pipe and connecting the concrete inside and outside the string pipe into a whole.
Further optimizing, the string pipe is formed by connecting a plurality of sub-pipes in series, and two adjacent sub-pipes are connected in a socket connection manner; the plurality of sub-pipes are connected in series, and are used for adjusting the length of the string pipe according to the length of the steel pipe column.
Further optimizing, wherein the upper end of the string pipe is provided with a funnel; because the caliber of the string pipe can be smaller than that of the pump pipe, in order to smoothly pour concrete into the string pipe, the funnel needs to be temporarily installed at the upper end of the string pipe, and the funnel can be taken out after the concrete pouring is completed.
Further optimizing, a pouring method of the prefabricated steel pipe column applied to a roof system comprises the following steps:
s1: preparing a steel pipe column body and self-compacting concrete according to the poured threshold height; if the height of the steel pipe column body is larger than the threshold height, installing the string pipe in the steel pipe column body, and performing step S2;
s2: pouring self-compacting concrete into the string pipe from the top of the string pipe to form backward flow until the top of the string pipe cannot be fed;
s3: after the top of the string pipe cannot be fed, extending the pump pipe into the steel pipe column body to directly cast self-compacting concrete until the self-compacting concrete is cast to the designed elevation;
s4: when the self-compacting concrete is poured to the designed elevation, the vibrating rod is adopted to extend into the steel pipe column body for vibrating, and pouring is completed at the moment.
Further toOptimizing, a self-compacting concrete, wherein the raw material ratio of the self-compacting concrete per cubic unit comprises: 395kg/m of cement 3 824kg/m of sand 3 12.5kg/m water reducing agent 3 30kg/m of swelling agent 3 50kg/m of fly ash 3 Mineral powder 25kg/m 3 30kg/m of micro silicon powder 3 And the balance water.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention provides a prefabricated steel pipe column applied to a roof system, a pouring method thereof and concrete.
2. The invention provides a prefabricated steel pipe column applied to a roof system, a pouring method thereof and concrete.
3. The invention provides a prefabricated steel pipe column applied to a roof system, a pouring method thereof and concrete.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a structure provided by the present invention;
FIG. 2 is a schematic view A of a portion of the present invention;
FIG. 3 is a schematic structural view of a fixing device according to the present invention;
fig. 4 is a partial schematic view of a string tube according to the present invention.
In the drawings, the reference numerals and corresponding part names:
the steel pipe column comprises a 1-steel pipe column body, a 2-string pipe, a 21-through hole, a 22-sub pipe, a 3-annular plate, a 4-fixing device, a 41-connecting rod, a 42-clamping block, a 43-bolt, a 44-screw hole and a 5-funnel.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
The embodiment 1 provides a prefabricated steel pipe column applied to a roof system, which comprises a steel pipe column body 1, a plurality of annular plates 3 and a string pipe 2, wherein the annular plates 3 are sequentially arranged along the length direction of the inner side of the steel pipe column body 1, as shown in fig. 1 to 4;
the lower end of the string pipe 2 extends into the steel pipe column body 1 and is fixedly connected with the steel pipe column body 1; the lower end part of the string pipe 2 is positioned between a ring plate 3 at the lowest part of the steel pipe column body 1 and the bottom of the steel pipe column body 1; the upper end of the string pipe 2 extends out of the upper end of the steel pipe column body 1.
Compared with the prior art, because the depth of the steel pipe column is overlarge and the plurality of steel structure annular plates 3 are arranged in the steel pipe column, in the concrete pouring process, the concrete is very difficult to vibrate and compact, and the problem of concrete segregation is easy to cause because of exceeding the self-compact concrete pouring height limit; specifically, a plurality of annular plates 3 are sequentially arranged on the inner side of the steel pipe column body 1 in the length direction, which is a conventional structural form of the existing steel pipe column, in the invention, a string pipe 2 is arranged inside the steel pipe column body 1, wherein the length of the string pipe 2 is matched with the length of the steel pipe column body 1, the lower end part of the string pipe 2 is close to the bottom of the steel pipe column body 1 and is preferably positioned 5m above the elevation of the last concrete finishing surface, but the lower end of the string pipe 2 is necessarily positioned below the annular plate 3 at the lowest end in the steel pipe column body 1, so that pouring is completed in a backward flow mode, and concrete segregation is avoided from being formed below the annular plate 3 at the lowest end; the upper end of the string pipe 2 is required to exceed the upper end of the steel pipe column body 1, and preferably exceeds the upper end elevation of the steel pipe column body 1 by 0.5 m; the diameter of the string pipe 2 is far smaller than the inner diameter of the annular plate 3, so that the string pipe 2 does not influence the pouring compactness of the self-compacting concrete, the string pipe 2 is parallel to the steel pipe column body 1, and the pouring stability of the string pipe 2 to the concrete is higher; after the steel pipe column is installed, pouring self-compacting concrete at the upper end of the string pipe 2 through a pump pipe, flowing out of the lower end of the string pipe 2 to form backward flow until the upper end of the string pipe 2 cannot continue to discharge, then directly pouring the pump pipe into the steel pipe column body 12 to 3 meters, continuously pouring the concrete to a designed elevation, and vibrating a vibrating rod into the steel pipe if the condition exists after the self-compacting concrete is poured to the designed elevation, so as to further ensure the pouring quality of the self-compacting concrete; the pouring of self-compaction concrete is completed, the concrete is poured in the steel pipe column body 1 through the string pipe 2, the reverse pouring is formed, the poured concrete can be prevented from segregation, and the concrete in the column is full and compact.
In this embodiment, the string pipe 2 is fixedly connected with the steel pipe column body 1 through the fixing device 4; the fixing device 4 comprises a connecting rod 41 and clamping blocks 42, a through hole 21 is formed in the side wall of the string pipe 2, one end of the connecting rod 41 is fixedly connected with the steel pipe column body 1, the other end of the connecting rod 41 stretches into the through hole 21, two clamping blocks 42 are arranged at the other end of the connecting rod 41, and the two clamping blocks 42 are respectively arranged on the inner side and the outer side of the side wall of the string pipe 2 and clamp the side wall of the string pipe 2; in order to improve the connection strength between the string pipe 2 and the steel pipe column body 1 and improve the pouring stability, in the scheme, a fixing device 4 is further arranged on the inner side wall of the steel pipe column body 1, wherein the fixing device 4 comprises a connecting rod 41 and a clamping block 42, one end of the connecting rod 41 is preferably welded on the inner side of the steel pipe column body 1, a reinforcing block is welded between one end of the connecting rod 41 and the inner side of the steel pipe column body 1, the size of the reinforcing block is larger than the cross section size of the connecting rod 41, and the reinforcing block is used for increasing the connection strength between the connecting rod 41 and the steel pipe column body 1; the other end of the connecting rod 41 is provided with two clamping blocks 42, the two clamping blocks 42 are upwards arranged, at the moment, the two clamping blocks 42 can clamp the side wall of the through hole 21 of the string pipe 2, bear the dead weight of the string pipe 2 and simultaneously fix the string pipe 2 through clamping force, so that stable pouring of self-compacting concrete is formed; the side wall of the clamping block 42 contacted with the string pipe 2 is preferably an arc-shaped side wall matched with the side wall of the string pipe 2, so that the contact surface is conveniently improved, and the clamping is stable.
In this embodiment, the fixing device 4 further includes a bolt 43, and both the clamping blocks 42 and the string pipe 2 are provided with screw holes 44 matched with the bolt 43; in order to provide stable clamping force, in the scheme, screw holes 44 are formed in two clamping blocks 42 and the side wall of the string pipe 2, bolts 43 sequentially penetrate through the clamping blocks 42, the side wall of the string pipe 2 and the other clamping block 42 in a threaded manner, and then fixation is realized through nuts, and at the moment, integral rigid connection is formed through the bolts 43, so that self-compacting concrete is stably poured; the fixing device 4 is required to be integrally manufactured when the steel pipe column body 1 is manufactured; through the fixing device 4, the string pipe 2 is quickly installed, and in the installation process, the length of the string pipe 2 can be adjusted according to the length of the steel pipe column body 1, so that the adaptability is wide; the connecting rod 41 can be fixed without penetrating through the string pipe 2 in a clamping block 42 mode, so that the phenomenon that the self-compaction concrete falls due to overlong length of the connecting rod 41 is influenced and segregation is avoided; the screw hole on the serial pipe 2 can be a straight through hole and can be realized without being a screw hole.
In this embodiment, a fixing device 4 is disposed between two adjacent ring plates 3; because the length of cluster pipe 2 and steel-pipe column body 1 is great, for forming stable connection, in this scheme, be equipped with a plurality of fixing device 4 in proper order on the inboard length direction of steel-pipe column body 1 to when preparing steel-pipe column body 1, for the adjustment of adaptation self and cluster pipe 2 length, all set up a fixing device 4 between two adjacent annular plates 3, when adapting to the length, can avoid the concrete of pouring between certain two annular plates 3 to cause cluster pipe 2 to drop.
In this embodiment, the serial pipe 2 is a hot dip galvanized steel pipe; because the string pipe 2 cannot be taken out after the self-compacting concrete is poured, in order to prevent the self-compacting concrete from being separated from the string pipe 2, in the scheme, the string pipe 2 needs to adopt a hot dip galvanized steel pipe, the coefficient of thermal expansion and contraction of the hot dip galvanized steel pipe is not greatly different from that of the self-compacting concrete, and when the self-compacting concrete expands and contracts, the hot dip galvanized steel pipe can deform synchronously to prevent the self-compacting concrete from being separated from the string pipe 2; wherein the serial pipe 2 adopts DN100 hot dip galvanized steel pipe.
In this embodiment, the through hole 21 is a long hole, the long hole can be penetrated by the fixing device 4, and the length of the long hole is greater than the height of the fixing device 4; in order to facilitate the installation of the string pipe 2 and enable the concrete inside and outside the string pipe 2 to be connected into a whole, in the scheme, the through hole 21 is a strip hole, wherein the width dimension and the length dimension of the strip hole are both larger than those of the fixing device 4, so that when the string pipe 2 is installed, the fixing device 4 can smoothly pass through the through hole 21 and move upwards, and the clamping block 42 can clamp the side wall above the through hole 21 of the string pipe 2; at this time, the lower part of the through hole 21 is reserved, so that the self-compaction concrete inside and outside the string pipe 2 is communicated, and the conditions of local segregation and the like are avoided.
In this embodiment, the serial pipe 2 is formed by connecting a plurality of sub-pipes 22 in series, and two adjacent sub-pipes 22 are connected in a socket connection manner; the lengths of the string pipes 2 can be adjusted according to the lengths of the steel pipe columns by connecting the plurality of sub-pipes 22 in series, and the adjacent sub-pipes 22 are connected in a socket manner, preferably in a rigid socket manner, and inserted into the socket of the end part of the other sub-pipe 22 through the socket of the end part of the sub-pipe 22.
In this embodiment, the upper end of the string pipe 2 is provided with a funnel 5; because the caliber of the string pipe 2 can be smaller than that of the pump pipe, in order to smoothly pour concrete into the string pipe 2, the funnel 5 needs to be temporarily installed at the upper end of the string pipe 2, and after the concrete pouring is completed, the funnel 5 can be taken out.
Example 2
The embodiment 2 is further optimized on the basis of the embodiment 1, and provides a pouring method of a prefabricated steel pipe column applied to a roof system, which comprises the following steps:
s1: preparing a steel pipe column body 1 and self-compacting concrete according to the poured threshold height; if the height of the steel pipe column body 1 is greater than the threshold height, installing the string pipe 2 in the steel pipe column body 1, and performing step S2;
s2: pouring self-compacting concrete into the string pipe 2 from the top of the string pipe 2 to form backward flow until the top of the string pipe 2 cannot be fed;
s3: after the top of the string pipe 2 cannot be fed, extending a pump pipe into the steel pipe column body 1 to directly cast self-compacting concrete until the self-compacting concrete is cast to a designed elevation;
s4: when the self-compacting concrete is poured to the designed elevation, the vibrating rod is adopted to extend into the steel pipe column body 1 for vibrating, and pouring is completed at the moment.
The specific working principle of the scheme is as follows: the engineering steel pipe concrete column is a supporting structure of a roof system, firstly, the threshold height of the steel pipe column body 1 to be poured is calculated through experiments and calculation, if the height of the steel pipe column body 1 is smaller than the calculated threshold height, a pump pipe is directly extended into the steel pipe column body 1 to perform self-compaction concrete pouring, and if the height of the steel pipe column body 1 is larger than the calculated threshold height, a string pipe 2 is required to be prepared and installed in the steel pipe column body 1 at the same time to be used for pouring, and the pouring effect of concrete can be affected when the height fall of the self-compaction concrete in the steel pipe column body 1 is larger than 9 meters through practical experiments and calculation. After the height of the steel pipe column body 1 is determined to be larger than a threshold value, preparing a steel pipe column body 1, a string pipe 2 and self-compacting concrete with corresponding lengths, then installing the steel pipe column body 1, installing a funnel 5 at the upper end of the string pipe 2, pouring self-compacting concrete into the string pipe 2 through the funnel 5 by a pump pipe, wherein the length of the string pipe 2 is 5m above the top elevation of the steel pipe column body 1 and 5m above the top elevation of the concrete finishing surface of the last time, but the steel pipe column body is required to exceed the lowest steel structure annular plate 3 so as to form a pouring backward mode, until the funnel 5 cannot continue to feed, then taking out the funnel 5, directly pouring the pump pipe into a steel pipe, continuing pouring the concrete to the designed elevation, and if the condition exists after the self-compacting concrete is poured to the designed elevation, extending a vibrating rod into the steel pipe for vibrating, and further ensuring the pouring quality of the concrete; through the technical measures, the concrete is ensured not to be isolated, and the concrete in the column is full and compact.
Example 3
This example 3 is further optimized on the basis of example 2, and provides a self-compacting concrete, wherein the raw material ratio of each cubic self-compacting concrete comprises: 395kg/m of cement 3 824kg/m of sand 3 12.5kg/m water reducing agent 3 30kg/m of swelling agent 3 50kg/m of fly ash 3 Mineral powder 25kg/m 3 30kg/m of micro silicon powder 3 And the balance water.
When the self-compacting concrete is prepared, the following requirements are met in order to ensure that the concrete is full and compact and reduce expansion with heat and contraction with cold:
1. the compressive strength of the concrete is not lower than 50MPA, and meets the design requirement.
2. The limiting expansion rate of 14d in water of the deformation performance of the concrete is tested to be more than 3.0 multiplied by 10 -4 The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, the total shrinkage rate of the concrete under the same curing condition is less than 2.8X10 -4 ；
The concrete mixing proportion per cube is as follows:
| cement and its preparation method | Sand and sand | Water and its preparation method | High-efficiency water reducing agent | Swelling agent (6%) | Fly ash | Mineral powder | Micro silicon powder |
| 395 | 824 | 180 | 12.5 | 30 | 50 | 25 | 30 |
The concrete with the novel mixing proportion is not separated from the steel pipe column wall after solidification, the self-compacting concrete ensures that the concrete poured in the steel pipe column is compact and full, the DN100 hot dip galvanized steel pipe is installed and fixed in the steel pipe column to serve as the serial pipe 2, the fall height of the concrete is ensured to meet the requirement, the concrete is protected from segregation, and the concrete in the steel pipe column is ensured to be full and compact.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The prefabricated steel pipe column applied to the roof system comprises a steel pipe column body (1), and a plurality of annular plates (3) are sequentially arranged along the length direction of the inner side of the steel pipe column body (1), and is characterized by further comprising a string pipe (2);
the lower end of the string pipe (2) extends into the steel pipe column body (1) and is fixedly connected with the steel pipe column body (1); the lower end part of the string pipe (2) is positioned between a ring plate (3) at the lowest part of the steel pipe column body (1) and the bottom of the steel pipe column body (1); the upper end of the string pipe (2) extends out of the upper end of the steel pipe column body (1);
the string pipe (2) is fixedly connected with the steel pipe column body (1) through a fixing device (4); the fixing device (4) comprises a connecting rod (41) and clamping blocks (42), a through hole (21) is formed in the side wall of the string pipe (2), one end of the connecting rod (41) is fixedly connected with the steel pipe column body (1), the other end of the connecting rod (41) stretches into the through hole (21), two clamping blocks (42) are arranged at the other end of the connecting rod (41), and the two clamping blocks (42) are respectively arranged on the inner side and the outer side of the side wall of the string pipe (2) and clamp the side wall of the string pipe (2) inside;
a fixing device (4) is arranged between two adjacent annular plates (3);
the through hole (21) is a strip hole, the strip hole can be penetrated by the fixing device (4), and the length of the strip hole is larger than the height of the fixing device (4).
2. The prefabricated steel pipe column applied to the roof system according to claim 1, wherein the fixing device (4) further comprises a bolt (43), and screw holes (44) matched with the bolt (43) are formed in the two clamping blocks (42) and the string pipe (2).
3. The prefabricated steel pipe column applied to a roof system according to claim 1, wherein the string pipe (2) is a hot dip galvanized steel pipe.
4. The prefabricated steel pipe column applied to a roof system according to claim 1, wherein the string pipe (2) is formed by connecting a plurality of sub pipes (22) in series, and two adjacent sub pipes (22) are connected in a socket connection mode.
5. A prefabricated steel pipe column for roof systems according to claim 1, characterized in that the upper end of the string pipe (2) is provided with a funnel (5).
6. The casting method of the prefabricated steel pipe column applied to the roof system according to any one of claims 1 to 5, comprising the following steps:
s1: preparing a steel pipe column body (1) and self-compacting concrete according to the poured threshold height; if the height of the steel pipe column body (1) is larger than the threshold height, installing the string pipe (2) in the steel pipe column body (1), and performing step S2;
s2: pouring self-compacting concrete into the string pipe (2) from the top of the string pipe (2) to form backward flow until the top of the string pipe (2) cannot be fed;
s3: after the top of the string pipe (2) cannot be fed, extending the pump pipe into the steel pipe column body (1) to directly pour the self-compacting concrete until the self-compacting concrete is poured to the designed elevation;
s4: when the self-compacting concrete is poured to the designed elevation, a vibrating rod is adopted to extend into the steel pipe column body (1) for vibrating, and pouring is completed at the moment.
7. A self-compacting concrete involved in the casting method of prefabricated steel pipe columns applied to roof systems as set forth in claim 6, characterized in that the raw material ratio per cubic unit of the self-compacting concrete comprises: 395kg/m of cement 3 824kg/m of sand 3 12.5kg/m water reducing agent 3 30kg/m of swelling agent 3 50kg/m of fly ash 3 Mineral powder 25kg/m 3 30kg/m of micro silicon powder 3 And the balance water.
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