CN112814150A - Rectangular steel sleeve type connection method for basic magnesium sulfate cement concrete assembled frame nodes - Google Patents
Rectangular steel sleeve type connection method for basic magnesium sulfate cement concrete assembled frame nodes Download PDFInfo
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- CN112814150A CN112814150A CN202011621750.2A CN202011621750A CN112814150A CN 112814150 A CN112814150 A CN 112814150A CN 202011621750 A CN202011621750 A CN 202011621750A CN 112814150 A CN112814150 A CN 112814150A
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- rectangular steel
- steel sleeve
- magnesium sulfate
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
- E04B1/215—Connections specially adapted therefor comprising metallic plates or parts
Abstract
The invention discloses a rectangular steel sleeve type connection method of an assembled frame node of basic magnesium sulfate cement concrete, which comprises the following steps: firstly, respectively pouring a precast beam and a precast column; in the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of end part sealing; in the pouring of the prefabricated column, the main reinforcement of the prefabricated column directly and normally extends out of the reinforcement; step two, after the prefabricated column is in place, a temporary supporting system is arranged, and the prefabricated beam is placed on the temporary supporting system; the rectangular steel sleeve is a tubular sleeve with a rectangular section; the side wall of the rectangular steel sleeve is a plane or a corrugated surface; sleeving the main reinforcement of the precast column by using a rectangular steel sleeve, connecting the main reinforcement of the precast beam with the outer side of the rectangular steel sleeve at the moment, and welding the main reinforcement of the precast beam and the rectangular steel sleeve; thirdly, post-pouring basic magnesium sulfate cement concrete pouring materials in a node core area between the precast columns and the precast beams; the basic magnesium sulfate cement concrete pouring material is a pouring material taking basic magnesium sulfate as a matrix. The invention has the advantages of reliable construction, good shock resistance and the like.
Description
Technical Field
The invention belongs to the field of constructional engineering, relates to a connecting method of fabricated concrete frame nodes, and particularly relates to a rectangular steel sleeve type connecting method of basic magnesium sulfate cement concrete fabricated frame nodes.
Background
The fabricated frame is a frame structure building which is formed by processing and manufacturing prefabricated columns, beams, plates and other components and accessories in a factory, transporting the prefabricated columns, beams, plates and other components to a construction site and assembling and installing the prefabricated columns, beams, plates and other components and accessories on the site in a reliable connection mode. Wherein the beam column node is an important factor influencing the seismic performance of the fabricated frame structure.
At present, the connection modes of the nodes are mainly divided into a wet connection mode and a dry connection mode, and an assembled integral node in the wet connection mode is a node form which is most widely applied in China at present. The post-cast concrete in the node area used at the present stage mainly comprises common portland concrete, and the properties such as ductility and the bonding force between new and old concrete are difficult to ensure aiming at the node casting of Basic Magnesium Sulfate Cement Concrete (BMSCC) fabricated buildings and common portland cement concrete fabricated buildings. In addition, the steel bar collision caused by the design or construction error of the prefabricated part mainly refers to the collision of the steel bar of the prefabricated beam and the steel bar of the prefabricated column, so that the problems that the prefabricated beam is difficult to install, the column hooping of the node area is difficult to install and the like are caused, and the more serious problems that the steel bar is cut off without permission and the hooping of the node area is installed are often caused during construction, so that the earthquake-resistant performance of the node is greatly influenced, and the potential safety hazard is caused.
Disclosure of Invention
The invention provides a rectangular steel sleeve type connection method for an assembled frame node of basic magnesium sulfate cement concrete, which overcomes the defects of the prior art.
In order to achieve the purpose, the invention provides a rectangular steel sleeve type connection method of an assembled frame node of basic magnesium sulfate cement concrete, which is characterized in that:
the method comprises the following steps:
firstly, respectively pouring a precast beam and a precast column; in the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of closed end, namely the reinforcement outlet ends of every two precast beam main reinforcements are connected through a steel bar; in the pouring of the prefabricated column, the main reinforcement of the prefabricated column directly and normally extends out of the reinforcement, namely, the reinforcement extending ends of the main reinforcement of the prefabricated column are free ends and are not connected with each other through extra steel bars;
step two, after the prefabricated column is in place, arranging a temporary supporting system, placing the prefabricated beam on the temporary supporting system, and enabling the edge of the prefabricated beam to be flush with the edge of the prefabricated column; the rectangular steel sleeve is an integral tubular sleeve with a rectangular section; the side wall of the rectangular steel sleeve is a plane or a corrugated surface, and the rectangular steel sleeve with the corrugated surface is suitable for casting materials with high bonding requirements; sleeving the main reinforcement of the precast column by using a rectangular steel sleeve, connecting the main reinforcement of the precast beam with the outer side of the rectangular steel sleeve at the moment, namely controlling the length of the output reinforcement of the main reinforcement of the precast beam to enable the output reinforcement to be connected with the rectangular steel sleeve sleeved on the main reinforcement of the precast column, and then welding the main reinforcement of the precast beam and the rectangular steel sleeve;
thirdly, post-pouring basic magnesium sulfate cement concrete pouring materials in a node core area between the precast columns and the precast beams; the basic magnesium sulfate cement concrete casting material is a casting material taking basic magnesium sulfate as a matrix. Wherein, the basic magnesium sulfate matrix is a basic magnesium sulfate matrix containing a basic magnesium sulfate hydration phase formed under the condition that magnesium oxide, magnesium sulfate and an additive coexist.
Further, the invention provides a rectangular steel sleeve type connection method of the basic magnesium sulfate cement concrete fabricated frame node, which can also have the following characteristics: the side wall of the rectangular steel sleeve is hollowed, and the hollowed rectangular steel sleeve is suitable for casting materials with poor workability.
Further, the invention provides a rectangular steel sleeve type connection method of the basic magnesium sulfate cement concrete fabricated frame node, which can also have the following characteristics: wherein, the side wall of the rectangular steel sleeve is non-hollow.
Further, the invention provides a rectangular steel sleeve type connection method of the basic magnesium sulfate cement concrete fabricated frame node, which can also have the following characteristics: the rectangular steel sleeve is formed by cutting a rectangular steel pipe or is formed by bending and welding a steel plate.
Further, the invention provides a rectangular steel sleeve type connection method of the basic magnesium sulfate cement concrete fabricated frame node, which can also have the following characteristics: in the third step, the basic magnesium sulfate cement concrete casting material has the strength 5-10 MPa higher than that of the precast beam and the precast column, the basic magnesium sulfate cement concrete casting material is stirred on site, and rough surfaces are made on the casting surfaces of the precast beam and the precast column before casting, and the rough surfaces are cleaned.
Further, the invention provides a rectangular steel sleeve type connection method of the basic magnesium sulfate cement concrete fabricated frame node, which can also have the following characteristics: and in the second step, the welding of the precast beam main rib and the rectangular steel sleeve adopts single-side welding, and the welding length is not less than 10 times of the diameter of the precast beam main rib.
Further, the invention provides a rectangular steel sleeve type connection method of the basic magnesium sulfate cement concrete fabricated frame node, which can also have the following characteristics: a gap is reserved between the beam end of the precast beam and the rectangular steel sleeve, the gap is not more than 100mm, and welding operation and post-cast concrete construction are facilitated.
Further, the invention provides a rectangular steel sleeve type connection method of the basic magnesium sulfate cement concrete fabricated frame node, which can also have the following characteristics: wherein the width of the cross section of the precast beam is not less than 250 mm.
The invention has the beneficial effects that:
the invention provides a rectangular steel sleeve type connection method for an assembled frame node of basic magnesium sulfate cement concrete, which comprises three main measures: the rectangular steel sleeve is adopted in the node area to replace the traditional stirrup, the main beam reinforcement does not enter the node core area but is welded with the rectangular steel sleeve, the basic magnesium sulfate cement concrete is adopted in the node area instead of the common silicate concrete, the collision of the main beam reinforcement and the column stirrup in the node area is avoided through the measures, and the construction quality is guaranteed; the basic magnesium sulfate cement concrete has the advantages of high ductility, high cohesiveness and the like, and can greatly improve the seismic resistance and energy consumption of the node; the traditional stirrups are replaced by excessive rectangular steel sleeves for the nodes, although the steel consumption is slightly increased, the labor cost is reduced through industrialized standardized prefabrication production, the economy can be improved, and more importantly, the anti-seismic requirements of 'strong node weak members, strong shear weak bending' can be met.
The rectangular steel sleeve is not an auxiliary construction measure, the action principle of the rectangular steel sleeve is 'equal to the stirrup', but the action principle of the rectangular steel sleeve is 'greater than the stirrup' in the bearing capacity effect, and the rectangular steel sleeve is an excess replacement for the stirrup required by the node core area.
The invention improves the seismic performance of the node, and the basic magnesium sulfate cement concrete assembled building node adopting the rectangular steel sleeve meets the requirement of building industrialization development, and has the advantages of reliable construction, good seismic resistance and the like.
Drawings
FIG. 1 is a schematic diagram of a rectangular steel sleeve type connection of an assembled basic magnesium sulfate cement concrete frame joint;
FIG. 2 is a front view of a planar non-hollowed rectangular steel sleeve;
FIG. 3 is a front view of a planar hollowed rectangular steel sleeve;
FIG. 4 is a front view of a corrugated-faced un-pierced rectangular steel sleeve;
FIG. 5 is a front view of a corrugated-faced hollowed rectangular steel sleeve.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The invention provides a rectangular steel sleeve type connection method for an assembled frame node of basic magnesium sulfate cement concrete, which comprises the following steps:
step one, respectively pouring the precast beam and the precast column. In the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of closed end, namely the reinforcement outlet ends of every two precast beam main reinforcements are connected through a steel bar; during pouring of the prefabricated column, the main reinforcement of the prefabricated column directly and normally extends out of the reinforcement, namely, the reinforcement extending end part of the main reinforcement of the prefabricated column is a free end and is not connected with the main reinforcement of the prefabricated column through additional steel bars.
Step two, as shown in fig. 1, after the precast columns 3 are in place, a temporary support system is arranged, the precast beams 1 are placed on the temporary support system, and the edges of the precast beams 1 are flush with the edges of the precast columns 3.
The rectangular steel jacket 5 is an integral tubular sleeve with a rectangular cross section. The side wall of the rectangular steel sleeve is a plane or a corrugated surface, and the rectangular steel sleeve with the corrugated surface is suitable for casting materials with high bonding requirements; the side wall of the rectangular steel sleeve is non-hollowed or hollowed, and the hollowed rectangular steel sleeve is suitable for casting materials with poor workability. The rectangular steel sleeve is cut from a rectangular steel pipe, or is formed by bending and welding a steel plate.
The main reinforcement 4 of the precast column is sleeved with the rectangular steel sleeve 5, the main reinforcement 2 of the precast beam is connected with the outer side of the rectangular steel sleeve 5 at the moment, namely, the reinforcement outlet length of the main reinforcement of the precast beam is controlled to be connected with the rectangular steel sleeve sleeved on the main reinforcement of the precast column, and then the main reinforcement 2 of the precast beam and the rectangular steel sleeve 5 are welded.
The welding of the precast beam main rib 2 and the rectangular steel sleeve 5 adopts single-side welding, and the welding length is not less than 10 times of the diameter of the precast beam main rib.
A gap is reserved between the beam end of the precast beam 1 and the rectangular steel sleeve 5, the gap is not more than 100mm, and welding operation and post-cast concrete construction are facilitated.
And step three, rough surfaces are made on the casting surfaces of the precast beams and the precast columns in advance and are cleaned, basic magnesium sulfate cement concrete casting materials are stirred on site, the basic magnesium sulfate cement concrete casting materials are higher than the concrete strength of the precast beams and the precast columns by 5-10 MPa, and post-casting is carried out on the core area of the node surrounded by the precast columns and the precast beams.
The basic magnesium sulfate cement concrete pouring material is a pouring material taking basic magnesium sulfate as a matrix. The basic magnesium sulfate matrix is formed under the condition that magnesium oxide, magnesium sulfate and an additive coexist, and the basic magnesium sulfate matrix contains a basic magnesium sulfate hydration phase.
In a specific embodiment, the basic magnesium sulfate cement concrete pouring material comprises a dry mixture and water, wherein the dry mixture comprises the following raw materials in parts by mass: 100 parts of magnesium oxide, 0.05-10 parts of admixture, 5-60 parts of magnesium sulfate, 0-300 parts of filler, 200 parts of sand 130-; wherein, the magnesia is one or two of magnesite light-burned powder and dolomite light-burned powder; the additive is 517 crystal nucleus inducer and one of sodium dihydrogen phosphate, sodium hydrogen phosphate and trisodium phosphateOr a mixture of more than one, wherein 517 the crystal nucleus inducer is 5Mg (OH)2·MgSO4·7H2O; the magnesium sulfate is magnesium sulfate heptahydrate; the filler is one or two of fly ash, silica fume, slag, wood dust, gypsum powder, dolomite powder and shale powder; the sand is one or two of river sand, lake sand, mountain sand, desalinized sea sand, machine-made sand and mixed sand; the coarse aggregate is one or two of crushed stone and pebble, and the particle size range of the coarse aggregate is 5-10 mm. The preparation method of the basic magnesium sulfate cement concrete pouring material comprises the following steps: and putting the dry mixture weighed according to the proportion into a stirrer for dry mixing, and putting water into the stirrer for uniform stirring to obtain the magnesium oxide-magnesium sulfate-magnesium mixed material.
The present invention is further illustrated by the following specific examples.
Example 1
The embodiment provides a rectangular steel sleeve type connection method of an alkali magnesium sulfate cement concrete fabricated frame node, which connects 700 × 700 prefabricated columns and 4 400 × 600 prefabricated beams at the node, and comprises the following steps:
step one, respectively pouring the precast beam and the precast column. In the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of end part sealing; and in the pouring of the prefabricated column, the main reinforcement of the prefabricated column directly and normally extends out of the reinforcement. The precast beam main reinforcement is 3 HRB335 steel reinforcements with the diameter of 25 on the upper and lower parts of the section; the concrete of the precast columns and the precast beams is basic magnesium sulfate cement concrete, and the strength grade is C40.
And step two, after the prefabricated columns are hoisted in place, arranging a temporary support system, and placing 4 prefabricated beams on the temporary support system, wherein the edges of the prefabricated beams are flush with the edges of the prefabricated columns. Sleeving the main ribs of the prefabricated columns from top to bottom by using rectangular steel sleeves, and then respectively welding the main ribs of the prefabricated beams of 4 prefabricated beams with the rectangular steel sleeves by adopting single-side welding, wherein the welding length is 250 mm. The rectangular steel sleeve is made of Q345 steel and is directly cut from the rectangular steel pipe, and the side face of the rectangular steel sleeve is not hollowed out, as shown in figure 2.
And step three, rough surfaces are prepared on the pouring surfaces of 4 precast beams and 1 precast column in advance and are cleaned, basic magnesium sulfate cement concrete pouring materials are stirred on site, the strength is C50, and post-pouring is carried out on the node core area.
Example 2
The embodiment provides a rectangular steel sleeve type connection method of an alkali magnesium sulfate cement concrete fabricated frame node, wherein 500 × 500 prefabricated columns are connected with 2 350 × 500 prefabricated beams at the node, and the method comprises the following steps:
step one, respectively pouring the precast beam and the precast column. In the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of end part sealing; and in the pouring of the prefabricated column, the main reinforcement of the prefabricated column directly and normally extends out of the reinforcement. The precast beam main reinforcement is 2 HRB400 steel bars with the diameter of 22 on the upper part and the lower part of the section respectively; the concrete of the precast columns and the precast beams is basic magnesium sulfate cement concrete, and the strength grade is C45.
And step two, after the prefabricated columns are hoisted in place, arranging a temporary support system, and placing 2 prefabricated beams on the temporary support system, wherein the edges of the prefabricated beams are flush with the edges of the prefabricated columns. Sleeving the main ribs of the prefabricated columns from top to bottom by using rectangular steel sleeves, and then respectively welding the main ribs of the prefabricated beams of 2 prefabricated beams with the rectangular steel sleeves by adopting single-side welding, wherein the welding length is 220 mm. The rectangular steel sleeve is made of Q345 steel and is directly cut from the rectangular steel pipe, and the side face of the rectangular steel sleeve is provided with a plurality of transverse strip-shaped hollows, so that the bonding force between the inner concrete and the outer concrete of the rectangular steel sleeve in the node core area is increased conveniently as shown in figure 3.
And step three, preparing rough surfaces on the pouring surfaces of the 2 precast beams and the 1 precast column in advance, cleaning, stirring basic magnesium sulfate cement concrete pouring materials on site, wherein the strength is C50, and post-pouring the node core area.
Example 3
The embodiment provides a rectangular steel sleeve type connection method of an assembly type frame node of basic magnesium sulfate cement concrete, which connects a prefabricated column of 450 × 450 and 4 prefabricated beams of 300 × 450 at the node, and comprises the following steps:
step one, respectively pouring the precast beam and the precast column. In the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of end part sealing; and in the pouring of the prefabricated column, the main reinforcement of the prefabricated column directly and normally extends out of the reinforcement. The precast beam main reinforcement is 3 HRB335 steel reinforcements with the diameter of 25 on the upper and lower parts of the section; the concrete of the precast columns and the precast beams is basic magnesium sulfate cement concrete, and the strength grade is C60.
And step two, after the prefabricated columns are hoisted in place, arranging a temporary support system, and placing 4 prefabricated beams on the temporary support system, wherein the edges of the prefabricated beams are flush with the edges of the prefabricated columns. Sleeving the main ribs of the prefabricated columns from top to bottom by using rectangular steel sleeves, and then respectively welding the main ribs of the prefabricated beams of 4 prefabricated beams with the rectangular steel sleeves by adopting single-side welding, wherein the welding length is 250 mm. The rectangular steel sleeve is made of Q345 steel, the rectangular steel sleeve is made of steel plates through bending and welding, the side faces are non-hollowed corrugated faces, and as shown in figure 4, the bonding force between the inner concrete and the outer concrete of the rectangular steel sleeve in the node core area is increased.
And step three, rough surfaces are prepared on the pouring surfaces of 4 precast beams and 1 precast column in advance and are cleaned, basic magnesium sulfate cement concrete pouring materials are stirred on site, the strength is C65, and post-pouring is carried out on the node core area.
Example 4
The embodiment provides a rectangular steel sleeve type connection method of an alkali magnesium sulfate cement concrete fabricated frame node, which connects 550 × 550 prefabricated columns and 2 350 × 500 prefabricated beams at the node, and comprises the following steps:
step one, respectively pouring the precast beam and the precast column. In the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of end part sealing; and in the pouring of the prefabricated column, the main reinforcement of the prefabricated column directly and normally extends out of the reinforcement. The precast beam main reinforcement is 2 HRB400 steel bars with the diameter of 22 on the upper part and the lower part of the section respectively; the concrete of the precast columns and the precast beams is common portland cement concrete, and the strength grade is C40.
And step two, after the prefabricated columns are hoisted in place, arranging a temporary support system, and placing 2 prefabricated beams on the temporary support system, wherein the edges of the prefabricated beams are flush with the edges of the prefabricated columns. Sleeving the main ribs of the prefabricated columns from top to bottom by using rectangular steel sleeves, and then respectively welding the main ribs of the prefabricated beams of 2 prefabricated beams with the rectangular steel sleeves by adopting single-side welding, wherein the welding length is 220 mm. The rectangular steel sleeve is made of Q345 steel, the rectangular steel sleeve is formed by bending and welding steel plates, the side face of the rectangular steel sleeve is a hollow corrugated face, and as shown in figure 5, the bonding force between the inner concrete and the outer concrete of the rectangular steel sleeve in the node core area is increased.
And step three, preparing rough surfaces on the pouring surfaces of the 2 precast beams and the 1 precast column in advance, cleaning, stirring basic magnesium sulfate cement concrete pouring materials on site, wherein the strength is C50, and post-pouring the node core area.
Claims (8)
1. A rectangular steel sleeve type connection method for an alkali magnesium sulfate cement concrete assembled frame node is characterized in that:
the method comprises the following steps:
firstly, respectively pouring a precast beam and a precast column;
in the pouring of the precast beam, the main reinforcement outlet of the precast beam adopts a form of end part sealing;
in the pouring of the prefabricated column, a main rib of the prefabricated column directly forms a rib;
step two, after the prefabricated column is in place, arranging a temporary supporting system, placing the prefabricated beam on the temporary supporting system, and enabling the edge of the prefabricated beam to be flush with the edge of the prefabricated column;
the rectangular steel sleeve is an integral tubular sleeve with a rectangular section; the side wall of the rectangular steel sleeve is a plane or a corrugated surface;
sleeving the main reinforcement of the precast column by using a rectangular steel sleeve, connecting the main reinforcement of the precast beam with the outer side of the rectangular steel sleeve at the moment, and welding the main reinforcement of the precast beam and the rectangular steel sleeve;
thirdly, post-pouring basic magnesium sulfate cement concrete pouring materials in a node core area between the precast columns and the precast beams;
the basic magnesium sulfate cement concrete casting material is a casting material taking basic magnesium sulfate as a matrix.
2. The rectangular steel sleeve type connection method for the basic magnesium sulfate cement concrete fabricated frame joint according to claim 1, characterized in that:
wherein, the lateral wall of the rectangular steel sleeve is hollowed out.
3. The rectangular steel sleeve type connection method for the basic magnesium sulfate cement concrete fabricated frame joint according to claim 1, characterized in that:
wherein, the side wall of the rectangular steel sleeve is non-hollow.
4. The rectangular steel sleeve type connection method for the basic magnesium sulfate cement concrete fabricated frame joint according to claim 1, characterized in that:
the rectangular steel sleeve is formed by cutting a rectangular steel pipe or is formed by bending and welding a steel plate.
5. The rectangular steel sleeve type connection method for the basic magnesium sulfate cement concrete fabricated frame joint according to claim 1, characterized in that:
in the third step, the basic magnesium sulfate cement concrete casting material has the strength 5-10 MPa higher than that of the precast beam and the precast column, the basic magnesium sulfate cement concrete casting material is stirred on site, and rough surfaces are made on the casting surfaces of the precast beam and the precast column before casting, and the rough surfaces are cleaned.
6. The rectangular steel sleeve type connection method for the basic magnesium sulfate cement concrete fabricated frame joint according to claim 1, characterized in that:
and in the second step, the welding of the precast beam main rib and the rectangular steel sleeve adopts single-side welding, and the welding length is not less than 10 times of the diameter of the precast beam main rib.
7. The rectangular steel sleeve type connection method for the basic magnesium sulfate cement concrete fabricated frame joint according to claim 1, characterized in that:
and a gap is reserved between the beam end of the precast beam and the rectangular steel sleeve, and the gap is not more than 100 mm.
8. The rectangular steel sleeve type connection method for the basic magnesium sulfate cement concrete fabricated frame joint according to claim 1, characterized in that:
wherein the width of the cross section of the precast beam is not less than 250 mm.
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| CN112049241A (en) * | 2020-09-01 | 2020-12-08 | 上海家树建筑工程有限公司 | Connecting structure for precast beam column and construction method thereof |
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| CN114789498A (en) * | 2022-03-09 | 2022-07-26 | 上海城建市政工程（集团）有限公司 | Production method of prefabricated part of UHPC (ultra high performance polycarbonate) external decorative plate with large opening rate |
| CN114789498B (en) * | 2022-03-09 | 2024-04-05 | 上海城建市政工程（集团）有限公司 | Production method of prefabricated part of UHPC (ultra high Performance) external decorative plate with large aperture ratio |
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