CN109898669B - Construction method for underground first-layer beam column joint by reverse construction method - Google Patents
Construction method for underground first-layer beam column joint by reverse construction method Download PDFInfo
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- CN109898669B CN109898669B CN201910185241.0A CN201910185241A CN109898669B CN 109898669 B CN109898669 B CN 109898669B CN 201910185241 A CN201910185241 A CN 201910185241A CN 109898669 B CN109898669 B CN 109898669B
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Abstract
The invention discloses a top-down construction method for an underground first-layer beam column joint, which comprises the following steps: the upper part of the steel column is welded with a guide column; excavating earth; dismantling the guide post; cutting a plain pile head at the top of the steel column, and chiseling the plain pile head into the steel column; inserting a main reinforcement of a steel reinforcement cage of a column core at the top of a steel column into the steel column and welding the main reinforcement with the inner wall of the steel column, and binding a spiral stirrup outside an exposed reinforcement at the top of a non-steel column section to serve as a node column core of the steel reinforcement cage and a superposed column; excavating earth to a designed elevation, then erecting a bottom template of a node, and binding frame beam steel bars and superposed column steel bars; and pouring concrete to complete the construction of the first-layer superposed column and the frame beam joint. The invention has the beneficial effects that: the guide post and the steel column are of a split structure, the main reinforcement of the steel reinforcement cage of the column top core column is not pre-buried in advance, the cutting difficulty of the guide post is low, the problem that the guide post is difficult to cut in the traditional method is solved, the risk of pipe clamping of the concrete pipe poured on the steel pipe column is reduced, and the construction quality is guaranteed.
Description
Technical Field
The invention relates to the field of constructional engineering construction, in particular to a top-down construction method for an underground first-layer beam column joint.
Background
With the increasing maturity of construction technology, the reverse construction method is already widely used. The super high-rise topdown method usually adopts one column and one pile as a vertical supporting structure, and the construction of the first-layer superposed column and the frame beam joint is one of important difficulties. The elevation of the top of the steel column is located below the bottom of the beam, the steel column completes construction along with the pile foundation synchronously, and the guide column needs to be welded on the upper portion of the steel column during early-stage steel column construction and used for hoisting and adjusting the steel column to hang down, and the steel column needs to be cut off during later-stage node construction. If according to traditional construction order, need before the steel column hoist and mount with stem steel reinforcement cage owner muscle and steel column inside weld, but break out and expose the major reinforcement rear and construct the node after the construction is accomplished. According to the method, the main reinforcement needs to enter the steel column to be embedded in advance, embedding and welding are difficult to carry out, and meanwhile, due to the fact that the high-strength concrete and the core column reinforcement cage main reinforcement exist in the guide column after construction is completed, the main reinforcement is very easy to damage when the guide column is cut, and construction difficulty is high. According to the invention, through post construction of the core column, the construction efficiency and the breaking difficulty of the guide column and the high-strength concrete are effectively improved by adopting a cutting torch and stack saw method, and the construction quality of the node is greatly improved.
Disclosure of Invention
The invention aims to provide a top-down construction method for an underground first-layer beam column joint, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a top-down construction method of underground first-layer beam column joints comprises the following steps:
the method comprises the following steps that firstly, a steel column and a pile foundation are constructed synchronously, and a guide column is welded to the upper portion of the steel column;
excavating earthwork to a position 0.8-1.2 m below the top of the steel column;
step three, after the guide post at the top of the steel post is excavated, the guide post is dismantled;
cutting a plain pile head at the top of the steel column, and chiseling the steel column;
inserting a column core steel reinforcement cage main reinforcement at the top of the steel column into the steel column and welding the steel column main reinforcement with the inner wall of the steel column, and binding a spiral stirrup outside an exposed reinforcement at the top of a non-steel tube column section to serve as a node column core of the steel reinforcement cage and the superposed column;
step six, earth excavation is carried out along with reverse operation, after the earth excavation reaches the designed elevation, a bottom template of a node is erected, and frame beam reinforcing steel bars and superposed column reinforcing steel bars are bound;
and seventhly, pouring concrete to finish the construction of the first-layer superposed column and the frame beam joint, as shown in fig. 3.
According to the scheme, in the second step, a steel plate cutting torch is adopted to cut the steel plate on the surface layer of the guide column, a folding saw is adopted to cut the plain concrete column in the guide column, and then the cut guide column is lifted away by a crane.
According to the scheme, in the third step, the chiseling depth H in the steel column meets the welding length of the main reinforcement of the steel core reinforcement cage and the inner wall of the steel column.
According to the scheme, in the fifth step, the column core steel reinforcement cage main reinforcement at the top of the steel column is connected with the inner wall of the steel column in a double-sided welding mode.
According to the scheme, in the fifth step, the main reinforcement of the column core reinforcement cage extending out of the upper section of the steel column is bound into the reinforcement cage by utilizing the spiral stirrups to form the beam-column node reinforcement cage.
According to the scheme, in the sixth step, the main reinforcement of the frame beam penetrates through the steel reinforcement cage column core formed by the inserted steel bars and the spiral stirrups.
The invention has the beneficial effects that: the guide column and the steel column are of a split structure, main reinforcements of a column top core column steel reinforcement cage are not pre-embedded in advance, the cutting difficulty of the guide column is low, the problem that when a reverse-construction superposed column and a first-layer frame beam node are constructed, a column core steel reinforcement is synchronously cut off when the guide column is pre-embedded and removed in advance is solved, the risk of pipe clamping of a concrete pipe poured by the steel pipe column is reduced, and the construction quality is ensured; meanwhile, the main reinforcement of the column core steel reinforcement cage is welded with the inner wall of the steel column, so that the construction difficulty is reduced, and the construction efficiency is improved.
Drawings
FIG. 1 is a schematic view showing the connection between a steel column and a guide column in the reverse construction of the present invention.
FIG. 2 is a schematic view of the steel column of the present invention after the upper portion of the steel column is completed.
Fig. 3 is a schematic diagram of a node between an inverted superposed column and a first-layer frame beam in the invention.
FIG. 4 is a sectional view of the node A-A between the reverse superposed column and the first-layer frame beam in the present invention.
Fig. 5 is a B-B cut-away view of the node of the reverse laminated column and the first-layer frame beam of the present invention.
Wherein: 1-steel column; 2-a guide post; 3-high-strength concrete; 4-column core steel reinforcement cage main reinforcement; 5-spiral stirrup; 6-frame beam; 7-a superposed column.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
A top-down construction method of underground first-layer beam column joints comprises the following steps:
step one, synchronously constructing a steel column 1 and a pile foundation, welding a guide column 2 at the upper part of the steel column 1 for hoisting and adjusting the verticality of the steel column 1, as shown in figure 1; in this embodiment, plain concrete is poured into the guide post 2;
excavating the earthwork of the underground first floor slab to a position 0.8-1.2 m below the top of the steel column 1, and providing an operation surface for cutting operation;
step three, after the guide column 2 at the top of the steel column 1 is excavated, removing the guide column 2: cutting a steel plate on the surface layer of the guide column 2 by using a steel plate cutting torch, cutting a plain concrete column in the guide column 2 by using a stack saw, and then hoisting the cut guide column 2 away by using a crane;
cutting a plain pile head at the top of the steel column 1, and chiseling a depth H into the steel column 1 by using a percussion drill, wherein the chiseling depth H is required to meet the welding length of the column core steel reinforcement cage main reinforcement 4 and the inner wall of the steel column 1; in this embodiment, the welding length is 10d1Wherein d is1Is the diameter of the main reinforcement 4 of the column core reinforcement cage;
step five, inserting the main reinforcement 4 of the steel column core reinforcement cage at the top of the steel column 1 into the steel column 1, welding the main reinforcement with the inner wall of the steel column 1 after chiseling (adopting double-sided welding), and binding the exposed reinforcement at the top of the non-steel column section
The spiral stirrup 5 is used as a node column core of the reinforcement cage and the superposed column 7, and the process is completed as shown in fig. 2;
sixth, earth excavation is carried out along with reverse operation, after excavation is carried out to the designed elevation, a bottom template of a node is erected, reinforcing steel bars of the frame beam 6 and reinforcing steel bars of the superposed column 7 are bound, as shown in fig. 4 and 5, the main reinforcing steel bars of the frame beam 6 penetrate through a steel bar cage column core formed by the inserted steel bars and the spiral stirrups 5, and reinforcing steel bars on the upper portion of the superposed column 7 are arranged for 12d2Anchoring length, d2Then, the upper steel bar of the superposed column 7 is made;
and seventhly, pouring concrete to finish the node construction of the first-layer superposed column 7 and the frame beam 6, as shown in fig. 3 (the concrete in the steel column is the high-strength concrete 3).
In the invention, a steel column 1 is a main structural member of a reverse construction method, and is constructed synchronously with a pile foundation in advance, and the top elevation of the steel column is positioned at the lower part of a frame beam 6; the upper part of the steel column 1 is welded with a verticality adjusting guide column 2 for hoisting and verticality adjusting of the steel column 1; before the construction of the top-down underground first-layer beam column joint, the excavation of the earth around the upper part of the steel column 1 and the guide column 2 needs to be finished, the excavation depth is controlled to be about 1m below a cutting surface, and the cutting construction is convenient; the method comprises the following steps of finishing earth excavation on the top of a steel column 1 and around a guide column 2, respectively cutting a surface steel plate of the guide column 2 by using a steel plate cutting torch (the principle of the steel plate cutting torch is that the surface steel plate is melted through at high temperature, but the cutting effect on concrete in the steel tube is not obvious), cutting a plain concrete column in the guide column 2 by using a folding saw, and then hanging away the cut guide column 2 (comprising the steel tube and the plain culvert concrete inside the steel tube); the whole steel bar of the frame beam 6 penetrates through the column core steel bar cage main bar 4, namely the dowel steel and the spiral stirrup 5 to form a steel bar cage, and is synchronously bound with the steel bar of the superposed column 7, concrete is poured, and the node strength is further improved.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (6)
1. A top-down construction method of an underground first-layer beam column joint is characterized by comprising the following steps:
the method comprises the following steps that firstly, a steel column and a pile foundation are constructed synchronously, and a guide column is welded to the upper portion of the steel column;
excavating earthwork to a position 0.8-1.2 m below the top of the steel column;
step three, after the guide post at the top of the steel post is excavated, the guide post is dismantled;
cutting a plain pile head at the top of the steel column, and chiseling the steel column;
inserting a column core steel reinforcement cage main reinforcement at the top of the steel column into the steel column and welding the steel column main reinforcement with the inner wall of the steel column, and binding a spiral stirrup outside an exposed reinforcement at the top of a non-steel column section to serve as a node column core of the steel reinforcement cage and the superposed column;
step six, earth excavation is carried out along with reverse operation, after the earth excavation reaches the designed elevation, a bottom template of a node is erected, and frame beam reinforcing steel bars and superposed column reinforcing steel bars are bound;
and seventhly, pouring concrete to finish the construction of the first-layer superposed column and the frame beam joint.
2. The top-down construction method of underground first-layer beam-column joints according to claim 1, wherein in the second step, a steel plate cutting torch is used for cutting a steel plate on the surface layer of the guide column, a folding saw is used for cutting a plain concrete column in the guide column, and a crane is used for lifting off the cut guide column.
3. The top-down construction method of underground first-floor beam-column joints according to claim 1, wherein in the third step, a depth H is chiseled into the steel column to satisfy the welding length of the main reinforcement of the steel reinforcement cage of the column core and the inner wall of the steel column.
4. The top-down construction method of an underground first-layer beam-column joint according to claim 1, wherein in the fifth step, the steel core reinforcement cage main reinforcement at the top of the steel column is connected with the inner wall of the steel column by double-sided welding.
5. The top-down construction method of an underground first-layer beam-column joint according to claim 1, wherein in the fifth step, the column core reinforcement cage main reinforcements extending from the upper section of the steel column are bound into a reinforcement cage by using spiral stirrups to form a beam-column joint reinforcement cage.
6. The top-down construction method of an underground first-floor beam-column joint according to claim 1, wherein in step six, the main frame beam reinforcement is extended through a reinforcement cage column core composed of a dowel and a spiral stirrup.
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| CN201910185241.0A CN109898669B (en) | 2019-03-12 | 2019-03-12 | Construction method for underground first-layer beam column joint by reverse construction method |
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| CN113047435B (en) * | 2021-03-18 | 2022-04-19 | 广州地铁设计研究院股份有限公司 | Cover-excavation top-down subway station beam column node structure and construction method |
| CN114351854A (en) * | 2021-12-02 | 2022-04-15 | 中石化宁波工程有限公司 | Reinforced concrete column and steel column connecting node structure |
| CN114775810A (en) * | 2022-05-31 | 2022-07-22 | 中冶赛迪工程技术股份有限公司 | Steel structure column-concrete column building joint structure and construction method |
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| JP2567990B2 (en) * | 1990-11-30 | 1996-12-25 | 三谷セキサン株式会社 | Reverse construction method for underground construction |
| CN100371545C (en) * | 2005-12-16 | 2008-02-27 | 张国梁 | Reversed construction method for building |
| US8875469B1 (en) * | 2012-10-16 | 2014-11-04 | William R. Keller, Sr. | Easily installable protective sleeve for an embedded wooden post requiring uplift capability |
| CN203546728U (en) * | 2013-10-28 | 2014-04-16 | 中国建筑第四工程局有限公司 | Improved installation fixing device of top-down steel pipe column |
| CN103628571B (en) * | 2013-12-09 | 2017-01-18 | 广州市第一建筑工程有限公司 | Beam-column joint for reverse construction method and construction method |
| CN103669866B (en) * | 2013-12-20 | 2015-08-26 | 广东省第四建筑工程公司 | The construction method of basement reinforced concrete post node connecting structure |
| CN204753628U (en) * | 2015-05-26 | 2015-11-11 | 中建三局集团有限公司 | Guider that hangs down is transferred to contrary way of doing things steel -pipe column that can have enough to meet need |
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Effective date of registration: 20221012 Address after: 430040, No. 1, Soochow Road, Dongxihu District, Hubei, Wuhan Patentee after: CHINA CONSTRUCTION THIRD BUREAU FIRST ENGINEERING Co.,Ltd. Patentee after: CHINA CONSTRUCTION THIRD ENGINEERING BUREAU GREEN INDUSTRY INVESTMENT Co.,Ltd. Address before: 430040, No. 1, Soochow Road, Dongxihu District, Hubei, Wuhan Patentee before: CHINA CONSTRUCTION THIRD BUREAU FIRST ENGINEERING Co.,Ltd. |
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