CN111236720B - Construction method for pouring silo decompression cone without construction joint - Google Patents
Construction method for pouring silo decompression cone without construction joint Download PDFInfo
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- CN111236720B CN111236720B CN202010064747.9A CN202010064747A CN111236720B CN 111236720 B CN111236720 B CN 111236720B CN 202010064747 A CN202010064747 A CN 202010064747A CN 111236720 B CN111236720 B CN 111236720B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
- E04H7/22—Containers for fluent solids, e.g. silos, bunkers; Supports therefor
- E04H7/24—Constructions, with or without perforated walls, depending on the use of specified materials
- E04H7/26—Constructions, with or without perforated walls, depending on the use of specified materials mainly of concrete, e.g. reinforced concrete or other stone-like materials
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
Abstract
The invention provides a construction method of a construction-joint-free silo decompression cone, which comprises the following steps: erecting a scaffold and an operation platform; constructing a support system of the bottom template of the decompression cone; binding the cone steel bars of the pressure reducing cone, wherein the outer side of the steel bar framework of the pressure reducing cone is fixed with a fine steel wire mesh through a turn wire; continuously pouring concrete layer by layer from the cone bottom to the cone tip of the pressure reducing cone, fully paving scaffold boards on the U-shaped overhanging reinforcing steel bars within the height range of the concrete to be poured, and fixing safety ropes to set up a construction platform; and removing the bottom template after the curing strength of the bottom ring beam of the pressure reducing cone and the cone concrete reaches 100%, then removing the construction platform and the support keel and performing anti-rust treatment. According to the construction method of the pressure reducing cone, the surface of the steel bar of the pressure reducing cone is covered with the fine steel wire mesh to replace the traditional top template, so that cold joints generated by concrete pouring can be effectively avoided, the construction period and the construction cost are reduced, and the construction method can be widely applied to the cast-in-place concrete construction of the pressure reducing cone in a cement factory.
Description
Technical Field
The invention relates to the field of construction of constructional engineering, in particular to a construction method for pouring a silo pressure reduction cone without a construction joint.
Background
Silo structures are common structures in plants for the cement industry. The silo is large in size and gradient and is constructed high above the ground, so that the construction process is complex and the construction period is long. In the construction of the conventional silo pressure reducing cone, a method of pouring concrete 2-3m at a time or a method of on-site vertical prefabrication is generally adopted, and both pouring methods need to keep a construction joint. Since the particle size of the raw material in a cement plant is 90 μm as a minimum, the construction joints are not prevented and need to be treated. Therefore, cold joints are easily generated in concrete casting, and a construction period is prolonged and construction costs are increased.
Disclosure of Invention
The invention aims to provide a construction method for pouring a pressure reducing cone without a construction joint, which can solve the problem of cold joint pouring of the existing silo structure pressure reducing cone and can reduce the pouring time.
In order to achieve the above object, a construction method for casting a pressure reducing cone without a construction joint according to the present invention includes the steps of:
building a scaffold and an operation platform, wherein the backfill soil is tamped and plain concrete is poured;
constructing a support system of a bottom template of the silo pressure reducing cone, wherein the bottom template is assembled on the ground in advance, then the bottom template and a channel steel keel for supporting the bottom template are assembled in a split mode on the ground and fixed with each other, then the bottom template and the channel steel keel are hoisted in a split mode to be installed, and a longitudinal light steel keel and a transverse light steel keel are fixed with each other and fixed with the bottom template;
binding the cone steel bars of the pressure reducing cone, reserving pre-embedded U-shaped overhanging steel bars serving as a support framework of the construction platform, welding and fixing, fixing a fine steel wire mesh on the outer side of the steel bar framework of the pressure reducing cone through a coil wire, laying a bottom formwork scaffold on a bottom formwork, fully laying scaffold boards on the U-shaped overhanging steel bars within the height range to be poured by concrete, and fixing safety ropes so as to erect the construction platform;
continuously pouring concrete layer by layer from the cone bottom to the cone tip of the pressure reducing cone, performing surface light-collecting treatment on the concrete before initial setting, and locally stirring the concrete by cement ash, wherein the step of pouring layer by layer is that a bottom ring beam of the pressure reducing cone is poured to a reserved hole, and then the upper cone wall of the reserved hole is poured; and
and (3) removing the bottom template after the curing strength of the bottom ring beam of the pressure reducing cone and the cone concrete reaches 100%, then removing the construction platform and the support keel, and performing rust prevention treatment.
Further, the step of erecting the scaffold and the operation platform may include: adopt the channel-section steel lumber skid to come the bottom of foreshadowing scaffold, operation platform full berth scaffold board, the major structure of fixed scaffold to is passed through the iron wire ligature at the both ends of scaffold board to on being connected to the horizon bar of scaffold with the safety net fixedly.
According to one embodiment of the invention, in the step of building the scaffold and the operation platform, the plain concrete with the thickness of 200-300mm can be poured, and the plain concrete can have the strength grade of C20.
In addition, in the step of constructing the support system for the bottom formwork of the silo pressure relief cone, the channel runners may preferably be pre-bent prior to installation.
Furthermore, when the cone steel bars of the pressure reducing cone are bound, a cross tie bar which is the same as the original tie bar in size can be added, and the interval between the cross tie bar and the original tie bar is the same, so that the cross tie bar and the original tie bar can be welded together.
Alternatively, the fine wire mesh may have a diameter of 0.6mm, an aperture of about 15mm and a width of 1.5m, and the turns may be 0.4mm wires.
Additionally, the U-shaped outrigger bars may alternatively have a diameter of 25mm and may be outriggered 800 mm.
According to an exemplary embodiment, the U-shaped cantilever reinforcement may be fixed to the coned reinforcement by welding.
Furthermore, in the step of pouring the concrete in layers, a ground pump can be adopted to pump the concrete to the upper part of the cone wall, and then the concrete is lifted by a tower crane to be poured.
Optionally, in the step of layered casting of the concrete, the height of each casting is 300 mm.
According to one embodiment of the invention, the concrete adopted for the layered casting can be fine-grained concrete with low fluidity, and the fine-grained concrete can have the following performance indexes:
the slump is 80 +/-20 mm;
the particle size of the coarse aggregate is about 6-12 mm; and
the initial setting time is more than or equal to 5 h.
Drawings
The above and other aspects and features of the present invention will become apparent from the following description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is a schematic illustration of a pressure reducing cone poured into a silo;
FIG. 2 is a schematic illustration of a fine wire mesh of a pressure reduction cone according to an embodiment of the present invention; and
FIG. 3 is a schematic view of a construction platform showing the top of a decompression cone.
Detailed Description
The construction method of the present invention for casting a decompression cone without a construction joint will be further described with reference to the accompanying drawings, which illustrate illustrative, non-limiting embodiments of the present invention.
Silo structures are common structures in cement industry plants, and it is usually necessary to cast a pressure reducing cone into a cast silo structure during construction. Referring to fig. 1, a schematic diagram of a construction for casting a pressure reducing cone in a silo is shown. The pressure reducing cone comprises a plain concrete cone top 1, a central cone 2 and a bottom template 3. The pressure reducing cone is placed on a reserved bracket of the poured silo 6, the reinforced concrete ring beam 7 is poured firstly, then the reinforced concrete pressure reducing cone is poured, and finally the plain concrete pressure reducing cone top is poured. And after curing, removing the bottom template to complete construction of the concrete decompression cone without the construction joint.
Specifically, a construction method for casting a silo decompression cone without a construction joint according to the present invention is described with reference to fig. 1 to 3, the construction method comprising the steps of:
building a scaffold and an operation platform, wherein the backfill soil is tamped and plain concrete is poured;
constructing a supporting system of a bottom template 3 of the silo pressure reducing cone, wherein the bottom template 3 is assembled on the ground in advance, then the bottom template 3 and a channel steel keel for supporting the bottom template are grouped and fixed with each other in a split mode on the ground, then the bottom template is installed in a split hoisting mode, and a longitudinal light steel keel 5 and a transverse light steel keel 4 are fixed with each other and the longitudinal light steel keel 5 and the transverse light steel keel 4 are fixed with the bottom template 3, for example, the bottom template can be fixed through a fastening piece such as a bolt;
binding the cone steel bars 12 of the pressure reducing cone, reserving pre-buried U-shaped overhanging steel bars 13 as a support framework of a construction platform, welding and fixing, fixing a fine steel wire mesh 10 outside the steel bar framework of the pressure reducing cone through a coil wire 11, laying a bottom formwork scaffold 8 on a bottom formwork, fully laying scaffold boards 14 on the U-shaped overhanging steel bars 13 in the height range of concrete to be poured and fixing safety ropes so as to conveniently build the construction platform, thereby ensuring the construction safety, ensuring the cohesiveness of the concrete between the bottom formwork and the steel bars in the pouring and vibrating process and the gradual follow-up of the laying of the fine steel wire mesh 10 along with the pouring;
continuously pouring concrete layer by layer from the cone bottom to the cone tip of the pressure reducing cone, performing surface light-collecting treatment on the concrete before initial setting, and locally stirring the concrete by cement ash, wherein the step of pouring layer by layer is that a bottom ring beam 7 of the pressure reducing cone is poured to a reserved hole 9, then the upper cone wall of the reserved hole 9 is poured, and the cone concrete is obliquely paved layer by layer and continuously poured; and
and (3) removing the bottom template 3 after the curing strength of the bottom ring beam 7 of the pressure reducing cone and the cone concrete reaches 100%, then removing the construction platform and the support keel and performing anti-rust treatment.
According to the construction method for pouring the silo pressure reducing cone without the construction joint, compared with the traditional construction method for the silo concrete pressure reducing cone, the thin steel wire mesh is covered on the surface of the main structural steel bar of the pressure reducing cone to replace a traditional top template, so that the construction quality and the construction safety are guaranteed, meanwhile, the cold joint generated by concrete pouring can be effectively avoided, the construction period and the construction cost are reduced, and the construction method can be widely applied to the construction of the pressure reducing cone cast-in-place concrete in a cement factory building.
According to an embodiment of the present invention, the step of erecting the scaffold and the operation platform may further include: adopt the channel-section steel lumber skid to mat the bottom of scaffold frame 8, operation platform full berth scaffold board 14, the main part structure of fixed scaffold frame 8 of iron wire ligature is passed through at the both ends of scaffold board 14 to on being connected to the horizontal pole of scaffold frame fixedly with the safety net. In addition, for example, a 200-300mm thick plain concrete may be cast, which may have a C20 strength rating.
Further, according to an example of the present invention, in the step of constructing the support system for the bottom formwork of the silo pressure reduction cone, the channel steel keels may be bent in advance before installation.
According to an embodiment of the present invention, when the cone-shaped steel bars 12 of the pressure reducing cone are bound, the cross tie bar 16 with the same size as the original tie bar 15 can be added, and the interval between the cross tie bar 16 and the original tie bar 15 is the same, so that the cross tie bar and the original tie bar can be welded together, thereby preventing the concrete from sliding down during vibration. Further, optionally, the U-shaped outrigger bars may have a diameter of 25mm and may be outriggered 800 mm. According to another example, the U-shaped cantilever reinforcement may be fixed to the cone reinforcement by welding. However, those skilled in the art will appreciate that the above dimensions and fastening means are merely exemplary, the dimensions of the U-shaped cantilever reinforcement are not limited thereto and other fastening means may be employed. Further alternatively, the fine wire mesh covered by the surface of the pressure reducing cone may have a diameter of 0.6mm, an aperture of about 15mm and a width of 1.5m, and the turns may be 0.4mm wires.
According to one embodiment of the invention, in the step of pouring the concrete in layers, the concrete can be pumped to the upper part of the cone wall by using a ground pump, then the concrete is lifted by using a tower crane for pouring, and a low-power, small-diameter and plug-in concrete vibrator can be adopted. In addition, in the step of layered casting of the concrete, the height of each casting is, for example, 300 mm.
According to an exemplary embodiment, the concrete adopted by the layered casting is fine-grained concrete with low fluidity, and the fine-grained concrete has the following performance indexes: (1) the slump is 80 +/-20 mm; (2) the particle size of the coarse aggregate is about 6-12 mm; and (3) the initial setting time is more than or equal to 5 hours. This results in good tamper resistance and cohesiveness as well as good compaction and uniformity.
Although exemplary embodiments of the present invention have been described, it will be apparent to those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (11)
1. A construction method for pouring a silo decompression cone without a construction joint comprises the following steps:
building a scaffold and an operation platform, wherein the backfill soil is tamped and plain concrete is poured;
constructing a support system of a bottom template of a silo pressure reducing cone, wherein the bottom template is assembled on the ground in advance, then the bottom template and a channel steel keel for supporting the bottom template are assembled in a split mode on the ground and fixed with each other, then the bottom template and the channel steel keel are installed in a split hoisting mode, a longitudinal light steel keel and a transverse light steel keel are fixed with each other, and the longitudinal light steel keel and the transverse light steel keel are fixed with the bottom template;
binding the cone steel bars of the pressure reducing cone, reserving pre-embedded U-shaped overhanging steel bars serving as a support framework of a construction platform, welding and fixing the pre-embedded U-shaped overhanging steel bars, fixing a fine steel wire mesh outside the steel bar framework of the pressure reducing cone through a coil wire, laying a bottom formwork scaffold on the bottom formwork, fully laying scaffold boards on the U-shaped overhanging steel bars within the height range to be poured by concrete, and fixing safety ropes so as to erect the construction platform;
continuously pouring concrete layer by layer from the cone bottom to the cone tip of the pressure reducing cone, wherein the concrete is subjected to surface light-collecting treatment before initial setting, and is locally stirred by cement ash and the concrete, wherein the step of pouring layer by layer is that a bottom ring beam of the pressure reducing cone is poured to a reserved hole, and then the upper cone wall of the reserved hole is poured; and
and after the maintenance strength of the bottom ring beam of the pressure reduction cone and the cone concrete reaches 100%, removing the bottom template, then removing the construction platform and the support keel, and performing antirust treatment.
2. The construction method according to claim 1, wherein the step of erecting a scaffold and an operation platform comprises:
adopt the channel-section steel lumber skid to foreshadow the bottom of scaffold, operation platform full berth scaffold board, the both ends of scaffold board are fixed to through the iron wire ligature on the major structure of scaffold to fixedly be connected to the safety net on the horizontal pole of scaffold.
3. The construction method as claimed in claim 1, wherein in the step of erecting scaffolds and operating platforms, plain concrete with a thickness of 200-300mm is poured, and the plain concrete has a strength grade of C20.
4. The construction method according to claim 1, wherein in the step of constructing the support system for the bottom formwork of the silo pressure reduction cone, the channel steel keel is bent in advance before installation.
5. The construction method according to claim 1, wherein a cross tie bar having the same size as an original tie bar is added when the cone-shaped reinforcing bars of the pressure reducing cone are bound, and the cross tie bar is spaced from the original tie bar at the same interval so as to weld the cross tie bar and the original tie bar together.
6. The construction method according to claim 1, wherein the fine steel wire mesh has a diameter of 0.6mm, a pore size of about 15mm and a width of 1.5m, and the spiral wires are 0.4mm steel wires.
7. The construction method according to claim 1, wherein the U-shaped outrigger bars have a diameter of 25mm and an outrigger of 800 mm.
8. The construction method according to claim 1, wherein the U-shaped overhanging reinforcing bars are fixed to the tapered reinforcing bars by welding.
9. The construction method according to claim 1, wherein in the step of pouring the concrete in layers, the concrete is pumped to the position above the cone wall by using a ground pump, and then the concrete is lifted by using a tower crane for pouring.
10. The construction method according to claim 1, wherein in the step of layered casting of the concrete, the height of each casting is 300 mm.
11. The construction method according to claim 1, wherein the concrete adopted by the layered casting is fine-grained concrete with low fluidity, and the fine-grained concrete has the following performance indexes:
the slump is 80 +/-20 mm;
the particle size of the coarse aggregate is about 6-12 mm; and
the initial setting time is more than or equal to 5 h.
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| CN112942829B (en) * | 2021-02-04 | 2022-04-29 | 中材建设有限公司 | Cement decompression awl template is from ann dismouting equipment |
| CN112942567B (en) * | 2021-02-04 | 2022-04-29 | 中材建设有限公司 | Construction method of self-mounting and dismounting equipment of cement pressure reducing cone template |
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