CN107586068B - Upright column concrete and construction method of concrete upright column - Google Patents
Upright column concrete and construction method of concrete upright column Download PDFInfo
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- CN107586068B CN107586068B CN201710753721.3A CN201710753721A CN107586068B CN 107586068 B CN107586068 B CN 107586068B CN 201710753721 A CN201710753721 A CN 201710753721A CN 107586068 B CN107586068 B CN 107586068B
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Abstract
The invention discloses upright concrete and a construction method of a concrete upright in the field of building construction, wherein the raw materials of the upright concrete comprise water, cement, sand, stone, admixture and admixture, and the water-to-cement ratio in the raw materials is 0.34; the construction method specifically comprises the steps of early-stage preparation, scaffold erection, column body reinforcing steel bar manufacturing and binding, fixed template manufacturing and installation, concrete stirring and transportation, concrete pouring, scaffold and template dismounting, finished product maintenance and the like. The upright column concrete has stronger tensile and impact resistance, longer service life, uniform mirror surface effect, compact construction process, shortened construction period of the upright column, reduced construction strength in peak period and laid foundation and preparation for subsequent construction.
Description
Technical Field
The invention relates to the field of buildings, in particular to upright column concrete and a construction method of a concrete upright column.
Background
Along with the acceleration of the urbanization process and the increase of extreme weather, urban rainstorm flood disasters are more and more frequent, and meanwhile, the urban underground water level is reduced year after year, and the urban water shortage is very serious. Therefore, the development and utilization of water resources become the focus of attention of people, and the application of the storage tank enables people to collect and utilize rainwater, so that great contribution is made to energy conservation. Most of existing regulation and storage tanks are formed by pouring reinforced concrete, specifically comprising the construction of a bottom plate, a side wall, a stand column and a beam plate, wherein the stand column construction process occupies an important part.
The existing upright post concrete has low tensile strength, large brittleness, easy cracking, poor toughness and poor impact resistance, and is easy to brittle fracture and fall off under the action of impact load, so that the bearing capacity of the concrete upright post structure is reduced, the service life is shortened, and the hidden danger of various disasters accidents is caused. Moreover, the construction process of the existing concrete upright post has long period, complex construction and high cost, and is not beneficial to the implementation of other construction procedures in the later period.
The above-mentioned drawbacks are worth solving.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides upright column concrete and a construction method of a concrete upright column.
The technical scheme of the invention is as follows:
on one hand, the upright column concrete is characterized in that the raw materials comprise water, cement, sand, stone, admixture and admixture, and the mass ratio of the raw materials is (0.36-0.44): 1: (1.57-1.93): (2.50-3.07): (0.12-0.37): (0.02-0.03), and the water-to-glue ratio in the raw materials is 0.34.
The invention according to the scheme is characterized in that the additive is a high-efficiency water reducing agent.
The invention according to the scheme is characterized in that the consumption of each raw material in per cubic meter of concrete is as follows: 155kg of water, 430 kg of cement, 675kg of sand, 1075kg of stone, 50kg of admixture and 9.6 kg of additive.
Further, the admixture is fly ash.
The invention according to the scheme is characterized in that the consumption of each raw material in per cubic meter of concrete is as follows: 155kg of water, 350kg of cement, 675kg of sand, 1075kg of stone, 130kg of admixture and 10.1kg of additive.
Further, the admixture is fly ash and mineral powder, and the mass of the fly ash and the mass of the mineral powder are respectively 50kg and 80 kg.
On the other hand, the construction method of the concrete upright is characterized by comprising the following steps:
s1: early preparation, which comprises the steps of scabbling and cleaning the stubble surface, measuring, paying off and positioning and retesting;
s2: erecting a stand column construction combined scaffold;
s3: manufacturing and binding column body reinforcing steel bars, and constructing embedded parts;
s4: manufacturing and installing a fixed template;
s5: completing the stirring and transportation of concrete, and pouring the concrete;
s6: dismantling the scaffold and the template;
s7: and (5) checking and accepting the finished product and maintaining.
The invention according to the above scheme is characterized in that in step S1, measurement control point encryption is performed in the field before construction lofting, and then the column position axis is measured and marked.
According to the invention of the scheme, in the step S2, the combined scaffold is erected by using a fastener-type steel pipe scaffold, a coil ladder is erected in the scaffold, and channel steel is welded at the top and the bottom of the vertical rod; when the stand column is constructed, two sections of combined scaffolds are hoisted and aligned, and then the lower section of top channel steel and the upper section of lower section of channel steel are connected by bolts to serve as an outer frame and an operation platform for stand column construction.
According to the invention of the scheme, the column body steel bars with the diameter being more than or equal to 16mm are connected by adopting straight thread sleeve machinery or binding welding, and the column body steel bars with the diameter being less than or equal to 16mm are connected by lap welding.
The present invention according to the above aspect is characterized in that, in step S3, all structural steel bars in the columns in the building are used as lightning protection shunts and downleads, and the lower ends of the structural steel bars are communicated with the electrical steel bars in the foundation.
The invention according to the scheme is characterized in that in the four-side structure of the template, the short-side template clamps the long-side template, the long side is connected with the short-side template flange plate through the bolt, the section of the column body is reinforced in the form of Eurya exterior hoop, the Eurya exterior hoop is welded with the template reinforced rib plate, and the column exterior tension rod is fastened.
The invention according to the scheme is characterized in that in the installation process of the template, the bottom of the template is fixed in a mode of arranging the reinforcing steel bar heads at the bottoms of the main reinforcing steel bars of the upright posts; when one section of the template is installed, correcting the verticality of the template by adopting a vertical line; and after the template is installed, fixing the steel template by using a cable, and correcting the verticality of the steel template by using a total station.
The invention according to the scheme is characterized in that in the step S5, a layer of cement mortar with the thickness of 2-3 cm and the same design label is paved before pouring, and the concrete is poured in layers with the thickness of 25-30 cm.
Furthermore, when concrete is poured, an insertion vibrator is adopted for vibrating, and the vibration depth of the vibrator is not more than 2/3-3/4 times of the length of the bar.
Further, after concrete pouring is finished, the upper surface is immediately covered with a plastic film, after final setting, the upper surface is covered with geotextile, and water is sprayed to keep moist.
According to the scheme, the upright column concrete has the advantages that the upright column concrete has stronger tensile and impact resistance, can effectively bear pressure, and has longer service life and high safety; the concrete has the characteristics of flatness, smoothness and high color and luster, and can form a uniform mirror surface effect. The construction process of the invention is compact, not only shortens the construction period of the upright column, but also ensures the timely turnover of the template, reduces the construction strength in the peak period, and lays a foundation and prepares for the subsequent construction.
Drawings
FIG. 1 is a construction flow chart of the present invention.
Detailed Description
The invention is further described with reference to the following figures and embodiments:
the upright column concrete comprises the following raw materials in percentage by mass (0.36-0.44): 1: (1.57-1.93): (2.50-3.07): (0.12-0.37): (0.02-0.03), and the water-to-glue ratio in the raw materials is 0.34.
Wherein the additive is a high-efficiency water reducing agent.
In one embodiment, the dosage of each raw material is respectively as follows: 155kg of water, 430 kg of cement, 675kg of sand, 1075kg of stone, 50kg of admixture and 9.6 kg of additive, wherein the admixture is fly ash. The specific use ratio is 0.36: 1.00: 1.57: 2.50: 0.12: 0.02.
formally realizing the slump of 120-160mm and the apparent density of 2395kg/m 3.
In another embodiment, the dosage of each raw material is respectively as follows: 155kg of water, 350kg of cement, 675kg of sand, 1075kg of stone, 130kg of admixture and 10.1kg of additive.
The specific use ratio is as follows: 0.44: 1: 1.93: 3.07: 0.37: 0.03. wherein the admixture is fly ash and mineral powder, and the mass of the fly ash and the mineral powder is 50kg and 80kg respectively.
As shown in fig. 1, a construction method of a concrete column includes the following steps:
first, early preparation, including chiseling and cleaning the stubble surface, measuring, paying off and positioning and retesting.
And (3) encrypting the measurement control points in the field before construction lofting, then guiding and measuring the column axis, and marking. During the construction of the upright post, a post body control line is measured on the surface of the bearing platform, and after rechecking, an ink line is popped up to be used as an upright post construction reference control line. And simultaneously, rechecking whether the reference control point measured and set during the construction of the bearing platform is accurate or not so as to control the elevation and the central line of the stand column.
And secondly, erecting a stand column to construct a combined scaffold.
The stand construction adopts combination scaffold, and combination scaffold adopts fastener formula steel pipe scaffold to set up, and high 6.0m sets up the coil ladder in the frame, and the channel-section steel is welded to pole setting top and bottom, and the channel-section steel is kept flat, and the bolt hole is opened to the waist, and interval and specification are unified to the bolt hole. When the stand column is constructed, two sections of combined scaffolds are hoisted and aligned, and then the lower section of top channel steel and the upper section of lower section of channel steel are connected by bolts to serve as an outer frame and an operation platform for stand column construction.
The row pitch between the upright rods of the combined scaffold is 1.5m, and the step pitch is 1.5 m. In order to provide a construction position for the construction of the steel bars and the templates, the combined scaffold is erected at a position 50cm away from the edge of the upright post.
The construction procedure of the steel pipe scaffold comprises the following steps: inside pole → outside pole → small cross bar → big cross bar → safety net → guard rail → diagonal bar → wall connecting bar → bamboo basketry → dense mesh net. Specifically, the method comprises the following steps:
(1) vertical rod
The bottom of each upright stanchion is provided with a base or a backing plate, the backing plate adopts a 5cm thick wood plate, and the lower part of the scaffold is provided with a longitudinal and a transverse floor sweeping rod. The procedure of erecting the starting upright rod first to the inner upright rod and erecting the starting upright rod then to the outer upright rod is set, and the inner upright rod keeps a clearance distance of 500mm with the building. The outer upright stanchion is taken out at the position which is parallel to the inner upright stanchion and extends outwards with the clear distance of 1200 mm-1500 mm.
(2) Longitudinal horizontal rod
The longitudinal horizontal rod is arranged on the inner side of the vertical rod; the longitudinal horizontal rods are lengthened by adopting butt fasteners or can be lapped.
(3) Horizontal rod
A transverse horizontal rod is arranged at the main node and is fastened by a right-angle fastener, and the center distance between the two right-angle fasteners at the main node is not larger than 150 mm.
(4) Scissor support
When the construction scaffold is erected, the vertical surfaces of the outer sides of the periphery of the scaffold are provided with the cross braces. The number of the cross vertical rods of each cross brace is 5-7, the width of each cross brace is not less than 4 spans and not less than 6m, and the inclination angle between each inclined rod and the ground is 45-60 degrees.
The extension of the diagonal rod of the cross brace adopts lap joint, and the lap joint requirement is the same as that of the vertical rod. The cross bracing diagonal rods are fixed on the extending ends or the vertical rods of the transverse horizontal rods intersected with the cross bracing diagonal rods by adopting a rotary fastener, and the distance from the central line of the rotary fastener to the main node is not more than 15 cm.
(5) Scaffold board
The scaffold boards are laid by butt-joint tiling or lap-joint laying. When the scaffold boards are butted and tiled, two transverse horizontal rods are required to be arranged at the joint, the extending length of the scaffold boards is 13-15 cm, and the sum of the extending lengths of the two scaffold boards is not more than 30 cm; when the scaffold boards are lapped and laid, the joints are supported on the transverse horizontal rods, the lapping length is more than 20cm, and the length of the joints extending out of the transverse horizontal rods is not less than 10 cm.
(6) Safety net
The safety net is divided into a vertical net and a flat net, the flat net is provided with one layer in two steps, and the vertical net is arranged outside the scaffold in a totally-closed mode. The safety net is firmly connected with the large cross rod and the small cross rod. And laying a working platform bamboo fence in the erecting process, and respectively binding the bamboo fence on the small cross bar by using a single 10# lead wire and double rings.
And thirdly, manufacturing and binding column body reinforcing steel bars, and constructing the embedded part.
1. Fabrication and connection of steel bars
The shape and length of the stressed steel bar bending, the tail end hook and the hoop tail end hook meet the requirements of design drawings, the column hoop is generally a composite hoop, except for the tie steel bar, a closed form is adopted, and the tail end is provided with a 135-degree hook. The bending diameter of the stirrup hook is larger than the diameter of the main reinforced steel bar to be hooped and is not smaller than 4 times of the diameter of the stirrup; the length of the straight section of the hook is not less than 10 times of the diameter of the stirrup. The column and the cast-in-place lintel are provided with a steel bar in the column, and the length of the steel bar extending out of the column outer skin is 1.2La of the length of the steel bar in the column. The adjacent longitudinal steel bar connecting joints of the columns are staggered, and the area percentage of the steel bar connecting joints in the same cross section is not larger than 50%. When the height of the foundation is less than 1.2m, the foundation steel bars of the columns are inserted to the steel bars on the bottom surface of the foundation, and then 200 long horizontal hooks are added. When the height of the foundation is more than or equal to 1.2m, the inserted bars at four corners can only extend to the bottom plate reinforcing steel bar net, and the insertion depths of the rest inserted bars meet the anchoring length LaE.
The steel bars with the diameter of more than or equal to 16mm can be connected by straight thread sleeve machinery or binding welding when being processed, and the steel bars with the diameter of less than or equal to 16mm are connected by lap welding. The length of the double-sided welding seam of the reinforced arc welding is not less than 5d, and the length of the single-sided welding seam is not less than 10 d. The welding thickness is more than or equal to 0.3d, and the welding width is more than or equal to 0.8 d.
2. Installation of reinforcing bars
After the combined scaffold is assembled and is qualified in inspection, the embedded steel bars of the bearing platform are corrected and repaired, the slurry and the iron rust floating on the steel bars are removed by a steel wire brush, and the steel bars can be bound according to design drawings after the combined scaffold meets the requirements.
(1) The thickness of the main reinforcement net protective layer of the upright post steel bar is not less than 35mm, and the thickness of the stirrup net protective layer is not less than 25 mm.
(2) When the reinforcing steel bars are mechanically connected, the mounting joints can be screwed by using a pipe wrench, and the screw heads of the reinforcing steel bars are pressed against each other at the central position of the sleeve. The exposed thread of the standard type joint after installation is not more than 2 p.
(3) When the bars are welded, the axes of the two connecting bars are consistent, and the welding length is not less than 5d (double-sided welding) or 10d (single-sided welding).
(4) Resistance spot welding is preferably adopted for welding the intersection points of the steel reinforcement framework and the steel reinforcement meshes.
(5) Less joints are required to be arranged on the same steel bar; the reinforcing steel bar joint is arranged at a section with small stress and is not suitable to be arranged at the maximum bending moment of the member; in any welded joint length section, there must not be two joints for the same bar, and the percentage of the joint cross-sectional area of the stressed bar in that section to the total cross-sectional area is no more than 50%. The weld joint length section means within the length of 35d, but not less than 500 mm.
(6) The distance from the end of the joint to the bending point of the steel bar is not less than 10 times of the diameter of the steel bar.
(7) The main reinforcement of the column body extends into the bottom of the bearing platform and is connected with the reinforcement at the bottom of the bearing platform.
(8) The stirrups adopt a closed type, the tail ends of the stirrups are made into 135-degree hooks, and the hook joints of the adjacent stirrups are arranged in a staggered mode along the height direction of the stand column.
(9) Set up the scaffold frame around according to stand structural dimension during stand reinforcing bar installation to set up construction dish ladder. The manual work carries out reinforcement on the scaffold frame, and the reinforcing bar is once installed and is accomplished, and the structure owner muscle connects mainly to adopt mechanical mantle fiber connected mode, adopts the bundle silk to tie up the jail between main muscle and the stirrup.
In order to ensure that the steel bar framework has enough rigidity and stability, welding is carried out on partial cross points of the steel bars or auxiliary steel bars are used for reinforcing. The thickness of the steel bar protective layer is ensured by adopting the concrete cushion block, the cushion block and the steel bar are bound firmly and are arranged in a staggered way, and not less than 4 cushion blocks are arranged per square meter.
(10) After the installation and construction of the steel bars of the upright post are finished, the cable wind ropes are symmetrically arranged at four corners of the upright post (5 mm steel wire ropes are adopted, each 6m of the post body is provided with one rope, 2 ropes are arranged at 9-12 m of the height, each rope is pulled in 4 directions), phi 25mm steel bars with the length of 80cm are buried at corresponding positions on the ground to serve as ground anchors, the included angle between the ground anchors and the equal cross section of the post body is not less than 20 degrees, the buried depth is not less than 50cm, the steel wire ropes are hung on the ground anchors through flange hooks, so that the angle between the steel wire ropes and the post body is approximately 40-60 degrees, after preliminary tensioning is carried out, four steel wire ropes are simultaneously and symmetrically rotated to hook.
3. Ground pre-buried installation
The lightning protection grounding uses the foundation and the steel bars in the foundation beam as a natural grounding device, uses all the structural steel bars in the columns in the building as lightning protection shunting and downlead, and the lower end of the lightning protection shunting and downlead is reliably communicated with the electrical steel bars in the foundation.
And fourthly, manufacturing and installing a fixed template.
1. Template fabrication
The standard festival height of column body steel form divide into 3m, 4.5m two kinds, and steel form panel face thickness is 5mm, adds the rib thickness 80mm, encloses and Eurya adopts 2, in the four sides template of column body steel form, the long limit template of minor face butt clamp, and long limit passes through bolted connection with the minor face template flange board.
The section of the column body is reinforced in the form of Eurya japonica external hoops, the Eurya japonica is welded with the reinforced rib plate of the template, and the external pull rod of the column is fastened.
2. Formwork installation
And (3) erecting the formwork by using an automobile crane or a tower crane to assist manual work, connecting the formworks by using bolts to form the formworks into a whole, and then reinforcing the formworks by adopting the pull rods arranged outside the formworks in a counter-pulling manner.
The bottom of the template is fixed by arranging the reinforcing steel bar heads at the bottoms of the main ribs of the upright posts, so that the bottom of the template is prevented from shifting when the template is erected. In the template installation process, when one section of template is installed, the perpendicularity of the template is corrected in time by adopting a perpendicular line for the template. And after the template is installed, fixing the steel template by using a cable, and correcting the verticality of the steel template by using a total station.
Before the template is installed, the axis and the edge line of the column body are released from the top surface of the bearing platform. When the template is installed, the plane position and the verticality of the first section template installation are strictly controlled. The template passes through the plumb bob and constantly inspects in the installation, guarantees the straightness that hangs down of shaft. When the formwork is installed, an operator needs to stand on the inner side of the scaffold for operation, and the operation surface is fully paved with scaffold boards.
In order to ensure the vertical stability of the template and prevent the template from inclining when concrete is poured, the template is fixed by adopting a method of erecting supports and cable-pulling wind ropes at the periphery: when the height of the pier is less than 12m, four guy cables are arranged at the top of the template and fixed in four directions; when the height of the column is more than 12m, four guy cables are respectively arranged at the top and 2/3 of the template and fixed on the surrounding ground in four directions, and the bottom angle of the template is fixed on the bearing platform by using anchor bolts.
Set up cement mortar cushion between reinforcing bar and template, the cushion should be fastened with the reinforcing bar, staggers each other.
And for steel templates with more turnover times, pasting double-sided super glue grout stop at the joints of the templates.
And fifthly, completing the stirring and the transportation of the concrete, and pouring the concrete.
1. Concrete production
The water-cement ratio of the concrete of the upright column is 0.34, the cement dosage is 350kg/m3, and the fly ash dosage is 50kg/m for carrying out heavy harvest. When the pumping concrete is adopted, the slump of the concrete is generally controlled to be 120-160mm, and the initial setting time is 6-8 h.
2. Pouring of concrete
Before pouring, a layer of cement mortar with the same design grade and the same thickness of 2-3 cm is paved to ensure good joint of the new concrete surface and the old concrete surface.
The concrete is transported by a concrete mixer truck, the concrete is pumped into a mould by an automobile pump and is poured in layers, the thickness of each layer is controlled to be about 25 cm-30 cm, the upper layer concrete is poured and tamped before the initial setting of the lower layer concrete, the pouring is continuously carried out, and the inserting type vibrator vibrates. After the upright columns are all poured to the transverse tie beam parts, the tie beams and the upright columns are synchronously, integrally and integrally poured in a layered mode until pouring is completed.
And during pouring, the free falling height of the concrete is not more than 1 m.
When concrete is poured, an insertion type vibrator (the diameter of the vibrator is 70 mm) is adopted for vibrating, the vibration depth of the vibrator is generally not more than 2/3-3/4 times of the length of the vibrator, the vibrator is inserted into the concrete on the lower layer by 5-10 cm during layered pouring, the moving distance is not more than 1.5 times of the action radius of the vibrator, the distance between the vibrator and a side mold is kept by 5-10 cm, the vibration duration time is 20-30 s for each vibration part, and the concrete is accurate to the conditions that the concrete does not sink, bubbles do not appear and laitance appears on the surface.
After concrete pouring is finished, the upper surface is immediately covered with a plastic film, and after final setting, materials such as geotextile and the like are covered, and water is sprayed to keep moist.
And sixthly, dismantling the scaffold and the template.
After the side surface of the upright post is demoulded, the upright post is immediately wrapped by two layers of plastic films (one layer is thin and the other layer is thick), and the joint part is bonded and sealed by an adhesive tape.
And seventhly, checking and accepting the finished product and maintaining the finished product.
After the two layers of plastic films are wrapped after the concrete of the upright post is demolded, the wood-rubber plate corner protectors are installed at four corners of the upright post, and then the dense mesh net is bound.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
The invention is described above with reference to the accompanying drawings, which are illustrative, and it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and technical solution, or to apply the inventive concept and technical solution to other fields without modification.
Claims (8)
1. The upright column concrete is characterized in that raw materials of the upright column concrete comprise water, cement, sand, stone, admixture and additive, and the mass ratio of the raw materials is 0.44: 1: 1.93: 3.07: 0.37: 0.03, the water-to-glue ratio of the raw materials is 0.34, and the dosage of each raw material in per cubic meter of concrete is as follows: 155kg of water, 350kg of cement, 675kg of sand, 1075kg of stone, 130kg of admixture and 10.1kg of additive, wherein the admixture is fly ash and mineral powder, and the mass of the fly ash and the mass of the mineral powder are respectively 50kg and 80 kg.
2. The column concrete of claim 1, wherein the admixture is a high efficiency water reducing agent.
3. The construction method of the concrete upright is characterized by comprising the following steps:
s1: early preparation, which comprises the steps of scabbling and cleaning the stubble surface, measuring, paying off and positioning and retesting;
s2: erecting a stand column construction combined scaffold;
s3: manufacturing and binding column body reinforcing steel bars, and constructing embedded parts;
s4: manufacturing and installing a fixed template;
s5: completing the stirring and transportation of the column concrete of claim 1 and pouring the concrete;
s6: dismantling the scaffold and the template;
s7: and (5) checking and accepting the finished product and maintaining.
4. The method of claim 3, wherein the measurement control point is encrypted in the field before the construction layout, and then the column position axis is measured and marked in step S1.
5. The method for constructing a concrete column according to claim 3, wherein in the step S2, the combined scaffold is erected by using a clip-type steel pipe scaffold, a coil ladder is erected in the combined scaffold, and channel steel is welded at the top and bottom of the vertical pole; when the stand column is constructed, two sections of combined scaffolds are hoisted and aligned, and then the lower section of top channel steel and the upper section of lower section of channel steel are connected by bolts to serve as an outer frame and an operation platform for stand column construction.
6. The construction method of the concrete column according to claim 3, wherein in the step S5, a layer of cement mortar with the same design mark number and the thickness of 2-3 cm is paved before pouring, and the concrete is poured in layers with the thickness of 25-30 cm.
7. The method for constructing the concrete column according to claim 6, wherein the concrete is cast by using an insertion vibrator, and the vibration depth of the vibrator is not more than 2/3-3/4 times of the length of the bar.
8. The method of constructing a concrete column according to claim 6, wherein the upper surface is covered with a plastic film immediately after the concrete is poured, covered with a geotextile after the concrete is finally set, and kept wet by sprinkling water.
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| CN113338537A (en) * | 2021-05-26 | 2021-09-03 | 中国五冶集团有限公司 | Construction method of ultrahigh large-section concrete frame column |
| CN116494676A (en) * | 2023-01-07 | 2023-07-28 | 重庆建工渝远建筑装饰有限公司 | Construction method of large relief hollow stone column |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05272198A (en) * | 1992-03-24 | 1993-10-19 | Penta Ocean Constr Co Ltd | Core column |
| JPH10194813A (en) * | 1996-12-26 | 1998-07-28 | Nippon Cement Co Ltd | Lightweight concrete |
| CN102373804A (en) * | 2011-11-15 | 2012-03-14 | 天津大学 | Novel precast concrete pipe column structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103936360B (en) * | 2014-03-17 | 2016-06-22 | 乌海市公路工程有限公司 | A kind of preparation of high efficient concrete and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05272198A (en) * | 1992-03-24 | 1993-10-19 | Penta Ocean Constr Co Ltd | Core column |
| JPH10194813A (en) * | 1996-12-26 | 1998-07-28 | Nippon Cement Co Ltd | Lightweight concrete |
| CN102373804A (en) * | 2011-11-15 | 2012-03-14 | 天津大学 | Novel precast concrete pipe column structure and construction method thereof |
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