CN111255163A - A restraint steel pipe overlap joint structure for prefabricating vertical member - Google Patents
A restraint steel pipe overlap joint structure for prefabricating vertical member Download PDFInfo
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- CN111255163A CN111255163A CN202010183025.5A CN202010183025A CN111255163A CN 111255163 A CN111255163 A CN 111255163A CN 202010183025 A CN202010183025 A CN 202010183025A CN 111255163 A CN111255163 A CN 111255163A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 273
- 239000010959 steel Substances 0.000 title claims abstract description 273
- 230000000452 restraining effect Effects 0.000 claims abstract description 40
- 238000010276 construction Methods 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 15
- 239000011440 grout Substances 0.000 claims abstract description 15
- 239000011178 precast concrete Substances 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 26
- 238000005192 partition Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000011374 ultra-high-performance concrete Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 20
- 238000009434 installation Methods 0.000 abstract description 10
- 238000012546 transfer Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a restraining steel pipe lap joint structure for vertical prefabricated parts, which is mainly used for connecting longitudinal steel bars of vertical parts such as precast concrete shear walls or columns. The method specifically comprises the following steps: the bottom of the upper prefabricated component is provided with a constraint steel pipe, the longitudinal ribs in the upper prefabricated component are exposed in the constraint steel pipe, the lower connecting steel bars are inserted into the constraint steel pipe and are in lap joint with the longitudinal ribs in the upper prefabricated component, then the filler is poured into the constraint steel pipe through the reserved vertical through long holes in the upper prefabricated component or the filler is poured into the constraint steel pipe through the reserved grouting holes and the grout outlet holes in the bottom of the upper prefabricated component, and after the strength of the filler meets the requirement, lap joint of the component steel bars can be achieved, so that the force transmission requirement is met. The connecting structure has reasonable stress, convenient production and installation of the components, easy control of construction quality and good anti-seismic performance of the components, and can solve the problems of difficult installation and construction, difficult lap joint force transfer performance and the like of the traditional connecting structure.
Description
Technical Field
The invention relates to the field of prefabricated parts, in particular to a connecting structure of prefabricated parts, and particularly relates to a connecting structure which can realize reliable lap joint force transmission of longitudinal ribs in prefabricated vertical components of upper and lower layers in a constraint steel pipe by arranging the constraint steel pipe and pouring or pouring filler into the steel pipe.
Background
At present, in an assembly type concrete structure system in China, the longitudinal bar connecting method of the prefabricated vertical component mainly comprises sleeve grouting connection, slurry anchor lap joint, post-cast concrete lap joint and the like.
The grouting connection method of the sleeve is mature and reliable, and the connection and member stress performance is good, but because the longitudinal ribs in each member need to be provided with the sleeve and the lower layer of connection longitudinal ribs need to be inserted into the sleeve one by one, the problems of large difficulty in field installation, difficult guarantee of grouting quality, high sleeve cost and the like are caused;
the slurry anchor lap joint method realizes lap joint of the longitudinal ribs in the component and the lower-layer connecting longitudinal ribs through preformed hole grouting, has the problem of difficult one-to-one insertion and installation as the sleeve grouting connection method, and has limited constraint effect of a connection area and incapability of fully exerting lap joint force transfer performance;
the post-cast concrete lap joint method generally realizes lap joint force transfer of the longitudinal bars and the lower layer connecting longitudinal bars in the member by reserving through-long holes and pouring concrete into the holes, and the method is convenient to construct, but has limited restraint effect in a connecting area and can not give full play to lap joint force transfer performance.
In summary, in order to solve the problems of difficult installation, difficult guarantee of construction quality, incapability of fully exerting the force transmission performance of lap joint and the like existing in the traditional connection method, a novel connection method is needed to be provided, the aims of quick installation, easy construction and reliable connection of the prefabricated vertical components are achieved, and technical support is further provided for the development of the prefabricated building in China.
Disclosure of Invention
The invention aims to provide a novel steel bar lap joint method for prefabricated vertical components, which realizes reliable lap joint force transfer of longitudinal bars in prefabricated vertical components of upper and lower layers in a restrained steel pipe by arranging a restrained steel pipe and pouring or pouring filler into the steel pipe, and solves the problems of difficult installation, difficult guarantee of construction quality, incapability of fully exerting lap joint force transfer performance and the like of the traditional connection method.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a restraining steel pipe lap joint structure for prefabricated vertical components, which is used for connecting edge components of a prefabricated concrete shear wall or longitudinal steel bars in a prefabricated concrete column, and is characterized by comprising a restraining steel pipe positioned at the bottom in an upper-layer prefabricated component, wherein a steel plate net or a steel wire net is fixed at the top of the restraining steel pipe, and a construction stirrup is arranged on the outer side of the restraining steel pipe; the longitudinal ribs at the bottom of the upper-layer prefabricated part and the connecting longitudinal ribs exposed out of the top surface of the lower floor are inserted into the restrained steel pipes and are in lap joint with each other; a seam is arranged between the upper-layer prefabricated part and the top surface of the lower floor; the constraint steel pipe is filled with filler; and the joint is pre-paved with base slurry before the upper prefabricated part is installed or filler is filled when the restraint steel pipe is filled.
Furthermore, a vertical through long hole is reserved in the upper-layer prefabricated part in the range of the upper part of the constraint steel pipe, the top and the bottom of the constraint steel pipe are respectively communicated with the vertical through long hole and the joint, and the constraint steel pipe and the vertical through long hole are filled with a filler poured through the vertical through long hole, wherein the filler is common concrete; or, a grouting hole and a grout outlet are reserved at the bottom of the upper prefabricated component, the bottom and the top of the restraint steel pipe are respectively communicated with the grouting hole and the grout outlet, the restraint steel pipe, the grouting hole and the grout outlet are filled with a filling material poured through the grouting hole, and the filling material is ultrahigh-performance concrete or high-strength cement-based grouting material.
Furthermore, when the restraining steel pipe lap joint structure is used for prefabricating edge members of the concrete shear wall, the restraining steel pipe is a rectangular steel pipe or a special-shaped steel pipe with two open ends when a vertical through long hole is reserved in the upper range of the restraining steel pipe by the upper-layer prefabricated member, the outer contour of the special-shaped steel pipe is convex and concave, and pull ribs which are vertically arranged along the thickness direction of the precast concrete shear wall are welded on the inner side wall of the restraining steel pipe; when the grouting holes and the grout outlet holes are reserved at the bottom of the upper-layer prefabricated part, the rectangular steel pipe, the special-shaped steel pipe or the welded combined steel pipe is adopted as the constrained steel pipe, the welded combined steel pipe is a multi-cavity constrained steel pipe formed by welding and combining the rectangular steel pipe and the C-shaped steel pipe, tie bars or partition plates vertically arranged along the thickness direction of the precast concrete shear wall are welded on the inner side wall of the rectangular steel pipe or the special-shaped steel pipe, and holes are formed in the partition plates and the steel plate wall in the welded combined steel pipe.
The steel pipe restraining and connecting structure is used for connecting longitudinal steel bars in a precast concrete column and is characterized in that when a vertical through long hole is reserved in the upper range of the steel pipe restraining and connecting structure for the upper precast component, the steel pipe restraining is a rectangular steel pipe or a special-shaped steel pipe with two open ends, the outer contour of the special-shaped steel pipe is convex and concave, and two-way arranged tie bars are welded on the inner side wall of the steel pipe restraining; when the grouting holes and the grout outlet holes are reserved at the bottom of the upper prefabricated part, the constraint steel pipes are rectangular steel pipes, special-shaped steel pipes or welded combination steel pipes, the welded combination steel pipes are multi-cavity constraint steel pipes formed by welding and combining the rectangular steel pipes, C-shaped steel and L-shaped steel, tie bars or partition plates arranged in two directions are welded on the inner side walls of the constraint steel pipes, and holes are formed in the partition plates and the steel plate walls in the welded combination steel pipes.
The invention has the following advantages:
1) the prefabricated vertical component adopting the connecting structure is convenient in hole forming mode, and processes such as core pulling and demoulding are not needed;
2) the prefabricated part adopting the connecting structure avoids the problem of one-to-one connection of the reinforcing steel bars, the lower-layer connecting longitudinal bars are easy to insert into the restrained steel pipe during installation, the overall installation difficulty is low, and the installation speed of the part can be improved;
3) the construction is convenient by adopting a through long hole pouring or grouting hole grouting mode, the filling material in the restraint steel pipe can be guaranteed to be compact, and the construction quality is easy to guarantee;
4) when the prefabricated member steel bar is pulled, the lateral restraint provided by the restraint steel pipe is beneficial to improving the lap joint strength; when the prefabricated part reinforcing steel bar is pressed, the lateral restraint provided by the restraint steel pipe is beneficial to improving the strength and the ductility of the filling material, and further the bearing capacity and the deformability of the member are improved.
Drawings
Fig. 1 is a schematic view of a restraining steel pipe lap joint structure for prefabricated vertical members according to embodiment 1 of the present invention.
FIG. 2 is a sectional view of FIG. 1, wherein (a) and (B) are both A-A sectional views, which are schematic views of different structures in the constraining steel pipe, respectively, and (c) is a B-B sectional view.
Fig. 3 is a schematic view of a restraining steel pipe lap joint structure for prefabricated vertical members according to embodiment 2 of the invention.
Fig. 4 is a sectional view taken along line a-a in fig. 3.
Fig. 5 is sectional views of a restraining steel pipe lap joint structure for prefabricated vertical members according to embodiment 3 of the present invention, wherein (a) and (B) are sectional views a-a, which are schematic views of different structures in a restraining steel pipe, respectively, and (c) is a sectional view B-B.
Fig. 6 is a sectional view a-a of a restraining steel pipe lap joint structure for prefabricated vertical members according to embodiment 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
For better understanding of the present invention, an application example of a restraining steel pipe lap joint construction for prefabricated vertical members proposed by the present invention will be described in detail below.
Example 1
Referring to fig. 1, the restraining steel pipe lap joint structure for prefabricated vertical members, which is provided by the embodiment 1 of the invention, is used for connecting longitudinal steel bars in edge members of a prefabricated concrete shear wall, and comprises a restraining steel pipe 1 positioned at the bottom in an upper prefabricated member 2, a steel plate net or a steel wire net 3 is fixed at the top of the restraining steel pipe 1, a construction stirrup 10 is arranged at the outer side of the restraining steel pipe 1, and a longitudinal bar 4 at the bottom of the upper prefabricated member 2 and a connecting longitudinal bar 6 exposed out of a top surface 5 of a lower floor are inserted into the restraining steel pipe 1 and are lapped with each other; a seam 9 is arranged between the upper-layer prefabricated part 2 and the lower floor top surface 5, and the height of the seam 9 is 20-50 mm; the restraint steel pipe 1 is filled with concrete 8 poured through a vertical through long hole 7 reserved in the upper-layer prefabricated part 2, the vertical through long hole 7 is also filled with the concrete 8, and a joint 9 is paved with a high-strength seat mortar material in advance before the upper-layer prefabricated part 2 is installed or filled with the concrete 8 after a gap is reserved; after the strength of the concrete 8 meets the requirement, the lap joint of the longitudinal bars of the upper and lower layers of prefabricated components can be realized, and the force transmission requirement is further met.
Referring to fig. 2, in the present embodiment, the restraining steel pipe may be a rectangular steel pipe 1a (as shown in fig. 2 (a)), the distance from the outer edge of the rectangular steel pipe 1a to the edge of the prefabricated part is 25-40 mm, and the wall thickness of the steel pipe is 1-4 mm; the inside of the rectangular steel pipe 1a is provided with a lacing wire along the thickness direction of the shear wall so as to improve the rigidity and the restraint effect of the rectangular steel pipe 1 a; wherein, the lacing wire is along vertical setting and with restraint steel pipe 1a inner wall welding, the lacing wire diameter is not less than 8mm, the interval is not more than 100mm, and is no less than 3.
The restraint steel pipe can also be a special-shaped steel pipe 1b (as shown in (b) in fig. 2), the outer contour of the special-shaped steel pipe 1b is concave-convex, the concave-convex size is 30-60 mm, so that the special-shaped steel pipe can be reliably combined with surrounding concrete, a lacing wire is arranged in the special-shaped steel pipe 1b, and the arrangement method is the same as that of the rectangular steel pipe 1 a.
The steel plate mesh or the steel wire mesh 3 arranged at the top of the restraint steel pipe 1 meets the rigidity requirement, the size of the mesh is not larger than 4mm, the steel plate mesh or the steel wire mesh 3 is used for preventing concrete from entering the restraint steel pipe 1 when a prefabricated part is produced, so that a cavity is formed in the restraint steel pipe 1 when the prefabricated part is formed, and the steel plate mesh or the steel wire mesh 3 is reliably connected with the top of the restraint steel pipe 1 in a welding mode and the like.
The structure stirrup 10 that the restraint steel pipe 1 outside set up for the concrete layer in drawknot and the restraint steel pipe 1 outside, the diameter of structure stirrup 10 is not less than 8mm, and the interval is not more than 50 mm.
The longitudinal ribs 4 in the upper-layer prefabricated part 2 are bent to enter the constraint steel pipe 1 and are in a completely exposed state (can be better wrapped with concrete in the steel pipe when being exposed), and the bending slope is not more than 1:6 (the embodiment is 1: 6). The connecting longitudinal ribs 6 exposed out of the top surface 5 of the lower floor are vertically inserted into the constraint steel pipe 1 and are in a staggered lap joint state with the longitudinal ribs 4 exposed out of the upper-layer prefabricated part 2.
Referring to fig. 2 (c), in the range above the restraint steel pipe 1, the hoop 12 is arranged on the periphery of the longitudinal rib 4 in the upper-layer prefabricated part 2, the tie 13 is arranged at the same time, the hoop 12 and the longitudinal rib 4 need to be hooked by the tie 13 at the same time, the diameters of the hoop 12 and the tie 13 are not less than 8mm, and the distance between the hoop 12 and the tie 13 is not more than 200 mm. The prefabricated part 2 on the upper portion of the restraint steel pipe 1 forms a vertical through long hole 7 through a pre-embedded corrugated pipe 14 in the range, and the corrugated pipe 14 is arranged close to the center and avoids a tie bar 13 in the range of the upper portion of the restraint steel pipe 1.
Example 2
Referring to fig. 3, a restraining steel pipe lap joint structure for prefabricated vertical members according to embodiment 2 of the present invention is used for connecting longitudinal steel bars in edge members of a prefabricated concrete shear wall. The difference from example 1 is that: in this embodiment, an Ultra-High Performance Concrete (UHPC) or a High-strength cement-based grouting material 17 is poured into the restraint steel pipe 1 through a grouting hole 15 and a grout outlet 16 reserved at the bottom of the upper prefabricated member 2, so as to replace the manner of pouring Concrete in embodiment 1; the restraining steel pipe 1 can adopt a welding combination steel pipe 1c (shown in figure 4) besides the rectangular steel pipe 1a and the special-shaped steel pipe 1b shown in the embodiment 1; when the constraint steel pipe 1 adopts a rectangular steel pipe 1a or a special-shaped steel pipe 1b, the lacing wires 11 in the constraint steel pipe can be replaced by partition plates which have the same height as the constraint steel pipe, the wall thickness of each partition plate is generally the same as that of the constraint steel pipe, the partition plates are welded with the inner wall of the constraint steel pipe, holes can be formed in the partition plates as required so as to facilitate the circulation of filling materials in the steel pipe, and the size of the holes is not less than 50 mm; when the constraint steel pipe 1 adopts the welded combination steel pipe 1C, according to the section size and the reinforcement structure of the upper prefabricated part 2, the rectangular steel pipe and the C-shaped steel are welded and combined to form a multi-cavity constraint steel pipe, holes can be formed in the wall of the inner steel pipe as required so as to facilitate the circulation of filling materials in the steel pipe, and the size of the holes is not less than 50 mm. Referring to fig. 4, in the present embodiment, the welded steel tube assembly 1C is formed by welding a rectangular steel tube 18 in the middle and C-shaped steel 19 on both sides, wherein the side wall of the rectangular steel tube 18 in the middle serves as a partition.
Example 3
The invention discloses a restraining steel pipe lap joint structure for prefabricated vertical members, which is used for connecting longitudinal steel bars in a prefabricated concrete column, is the same as the connecting structure of the embodiment 1 (shown in figure 1), and is different in that: referring to fig. 5, the tie 011 disposed in the constraining steel pipe of this embodiment (as shown in fig. 5 (a) and (b), 1a and 1b are respectively a rectangular steel pipe and a special-shaped steel pipe), and the tie 013 (as shown in fig. 5 (c)) disposed in the upper prefabricated column of the constraining steel pipe are both arranged in two directions. The distance from the outer edge of the rectangular steel pipe 1a or the special-shaped steel pipe 1b to the edge of the prefabricated part is 25-40 mm, and the wall thickness of the steel pipe is 1-4 mm.
Example 4
The invention provides a restraining steel pipe lap joint structure for prefabricated vertical members, which is used for connecting longitudinal steel bars in a prefabricated concrete column, and is the same as the connecting structure of the embodiment 2 (as shown in figure 3), except that: when the constraint steel pipe of the embodiment adopts a rectangular steel pipe or a special-shaped steel pipe, the tie bars or the partition plates 011 arranged in the constraint steel pipe and the tie bars 013 in the prefabricated column range at the upper part of the constraint steel pipe are arranged in two directions, and the arrangement of the tie bars or the partition plates 011 and the tie bars 013 are the same as those in (a), (b) and (c) in fig. 5; referring to fig. 6, when the constraint steel pipe of this embodiment is a welded combination steel pipe 1C, according to the cross-sectional dimension and the reinforcement structure of the upper prefabricated component 2, a multi-cavity constraint steel pipe can be formed by welding and combining a rectangular steel pipe, C-shaped steel, and L-shaped steel, and a hole can be formed in the wall of the inner steel pipe as required to facilitate the circulation of a filling material in the steel pipe, wherein the hole has a dimension not less than 50 mm. The distance from the outer edge of the restraint steel pipe to the edge of the prefabricated part is 25-40 mm, and the wall thickness of the steel pipe is 1-4 mm.
In summary, the filling method of the filler in the constrained steel pipe is subdivided into the following two methods:
the first method comprises the following steps: the corrugated pipe is arranged in the range of the prefabricated part on the restraint steel pipe, and the filler is generally common concrete and is poured into the restraint steel pipe through the through long hole. At the moment, the constraint steel pipe is generally a rectangular steel pipe or a special-shaped steel pipe, the inside of the constraint steel pipe is generally provided with a lacing wire, and the corrugated pipe is arranged close to the center and avoids the lacing wire in the upper range of the constraint steel pipe. When the steel tube is used for prefabricating the edge member of the shear wall, the tie bars in the constraint steel tubes are arranged along the thickness direction of the shear wall; when the steel tube inner tie bar is used for prefabricating the column, the tie bar in the steel tube is restrained to be arranged in two directions.
And the second method comprises the following steps: the bottom of the restraint steel pipe is provided with a grouting hole, the top of the restraint steel pipe is provided with a grout outlet, and the filling material is generally UHPC or high-strength cement-based grouting material and is subjected to pressure grouting from the grouting hole. At the moment, rectangular or special-shaped steel pipes provided with tie bars or partition plates can be adopted in the constraint steel pipes, and welding combination steel pipes can also be adopted. When the prefabricated steel tube is used for prefabricating edge members of the shear wall, the tie bars or the partition plates are arranged along the thickness direction of the shear wall, and the welded combined steel tube is generally formed by welding a rectangular steel tube in the middle and C-shaped steel tubes on two sides; when the combined steel pipe is used for prefabricating columns, the tie bars or the partition plates are arranged in two directions, and the welded combined steel pipe is generally formed by welding a rectangular steel pipe in the middle, C-shaped steel on two sides and L-shaped steel on corners.
In the description herein and in the drawings, the products and methods of the present invention are described in terms of particular shapes, materials, or process sequences, and specific parameters are provided for illustrative purposes with respect to specific embodiments. It should be understood, however, that the detailed description is not intended to limit the invention; that is, variations and modifications in the form, material, or process sequence may be made while remaining within the spirit and scope of the invention.
Claims (10)
1. A restraining steel pipe lap joint structure for prefabricated vertical components is used for connecting edge components of a prefabricated concrete shear wall or longitudinal steel bars in a prefabricated concrete column and is characterized by comprising a restraining steel pipe (1) positioned at the bottom in an upper prefabricated component (2), a steel plate net or a steel wire net (3) is fixed at the top of the restraining steel pipe (1), and a construction stirrup (10) is arranged on the outer side of the restraining steel pipe (1); the longitudinal ribs (4) at the bottom of the upper-layer prefabricated part (2) and the connecting longitudinal ribs (6) exposed out of the top surface (5) of the lower floor are inserted into the constraint steel pipe (1) and are in lap joint with each other; a seam (9) is arranged between the upper-layer prefabricated part (2) and the lower floor top surface (5); the restraint steel pipe (1) is filled with filler; the seam (9) is pre-paved with base slurry before the upper-layer prefabricated part (2) is installed or filler is filled when the constraint steel pipe (1) is filled.
2. The steel pipe restraining overlap joint construction of claim 1, wherein a vertical through long hole (7) is reserved in the upper range of the steel pipe restraining (1) by the upper prefabricated component (2), the top and the bottom of the steel pipe restraining (1) are respectively communicated with the vertical through long hole (7) and the seam (9), the steel pipe restraining (1) and the vertical through long hole (7) are filled with a filler poured through the vertical through long hole (7), and the filler is common concrete (8); or a grouting hole (15) and a grout outlet (16) are reserved at the bottom of the upper prefabricated component (2), the bottom and the top of the restraint steel pipe (1) are respectively communicated with the grouting hole (15) and the grout outlet (16), the restraint steel pipe (1), the grouting hole (15) and the grout outlet (16) are filled with a filling material poured through the grouting hole (15), and the filling material is ultrahigh-performance concrete or high-strength cement-based grouting material (17).
3. The overlap joint construction of the restraint steel pipes according to claim 1, which is used for edge members of a precast concrete shear wall, and is characterized in that when the upper precast member (2) reserves a vertical through long hole (7) in the upper range of the restraint steel pipe (1), the restraint steel pipe (1) is a rectangular steel pipe (1a) or a special-shaped steel pipe (1b) with two open ends, the outer contour of the special-shaped steel pipe (1b) is convex and concave, and the inner side wall of the restraint steel pipe (1) is welded with a tie bar (11) which is vertically arranged along the thickness direction of the precast concrete shear wall; when grout hole (15) and grout outlet (16) are reserved at the bottom of upper prefabricated part (2), rectangular steel pipe (1a), special-shaped steel pipe (1b) or welding combination steel pipe (1C) are adopted for constraint steel pipe (1) in a multi-cavity mode, the constraint steel pipe is formed by welding combination of rectangular steel pipe and C-shaped steel, tie bars or partition plates (011) which are vertically arranged along the thickness direction of the prefabricated concrete shear wall are welded on the inner side wall of rectangular steel pipe (1a) or special-shaped steel pipe (1C), and holes are formed in the partition plates and the steel plate wall in welding combination steel pipe (1C).
4. The overlap joint construction of the restraint steel pipes according to claim 1, used for connecting longitudinal steel bars in precast concrete columns, characterized in that when the upper precast element (2) reserves a vertical through long hole (7) in the upper range of the restraint steel pipe (1), the restraint steel pipe (1) is a rectangular steel pipe (1a) or a special-shaped steel pipe (1b) with two open ends, the outer contour of the special-shaped steel pipe (1b) is convex and concave, and the inner side wall of the restraint steel pipe (1) is welded with a tie bar (11) arranged in two directions; when grout hole (15) and grout outlet (16) are reserved at the bottom of upper prefabricated component (2), rectangular steel pipe (1a), special-shaped steel pipe (1b) or welding combination steel pipe (1C) are adopted in restraint steel pipe (1), multi-cavity restraint steel pipe formed by welding combination of rectangular steel pipe, C-shaped steel and L-shaped steel is adopted in welding combination steel pipe (1C), two-way arranged lacing wires or partition boards (011) are welded on the inner side wall of restraint steel pipe (1), and holes are formed in the partition boards and the steel plate wall in welding combination steel pipe (1C).
5. The restraining steel pipe lap joint construction of claim 3 or 4, wherein the tie bars have a diameter of not less than 8mm, a pitch of not more than 100mm, and not less than 3; the convex-concave size of the special-shaped steel pipe (1b) is 30-60 mm.
6. The restraining steel pipe lap joint construction of claim 3 or 4, wherein the thickness of the spacer is the same as the wall thickness of the restraining steel pipe (1), and the opening size is not less than 50 mm.
7. The overlap joint construction of the restraint steel pipes according to claim 1, wherein the distance from the outer edge of the restraint steel pipe (1) to the edge of the prefabricated member is 25-40 mm, and the wall thickness of the restraint steel pipe (1) is 1-4 mm; the mesh size of the steel plate mesh or the steel wire mesh (3) at the top of the restraint steel pipe (1) is not larger than 4 mm.
8. The overlap joint construction of the restraint steel pipe according to claim 1, wherein the height of the seam (9) is 20-50 mm.
9. The overlap joint construction of the restraint steel pipe according to claim 1, wherein the construction stirrup (10) arranged outside the restraint steel pipe (1) has a diameter of not less than 8mm and a spacing of not more than 50 mm.
10. The steel pipe lap joint structure of claim 1, wherein the longitudinal ribs (4) in the upper prefabricated component (2) enter the steel pipe (1) through bending and are in a completely exposed state, and the bending slope is not more than 1: 6; the steel pipe is characterized in that stirrups (12) are arranged on the periphery of longitudinal bars (4) in the range above a constraint steel pipe (1) in the upper prefabricated part (2), tie bars (13) are arranged, the stirrups (12) and the longitudinal bars (4) need to be hooked by the tie bars (13) at the same time, the diameters of the stirrups (12) and the tie bars (13) are not smaller than 8mm, and the distance between the stirrups (12) and the tie bars (13) is not larger than 200 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010183025.5A CN111255163A (en) | 2020-03-16 | 2020-03-16 | A restraint steel pipe overlap joint structure for prefabricating vertical member |
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| CN202010183025.5A CN111255163A (en) | 2020-03-16 | 2020-03-16 | A restraint steel pipe overlap joint structure for prefabricating vertical member |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112431305A (en) * | 2020-10-30 | 2021-03-02 | 中民筑友房屋科技(石首)有限公司 | Assembly type building frame and quick connection method thereof |
| CN113338539A (en) * | 2021-06-23 | 2021-09-03 | 福建九鼎建设集团有限公司 | Assembled reinforced concrete combination column |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0960194A (en) * | 1995-08-25 | 1997-03-04 | Nkk Corp | Precast concrete structure |
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| CN212453344U (en) * | 2020-03-16 | 2021-02-02 | 建研科技股份有限公司 | A restraint steel pipe overlap joint structure for prefabricating vertical member |
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| CN202627249U (en) * | 2012-05-31 | 2012-12-26 | 东南大学 | Connecting structure for edge members of prefabricated concrete shear wall |
| CN103850363A (en) * | 2014-03-11 | 2014-06-11 | 朱彤 | Prefabricated through hole assembly type reinforced concrete shear wall and construction method of prefabricated through hole assembly type reinforced concrete shear wall |
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| CN112431305A (en) * | 2020-10-30 | 2021-03-02 | 中民筑友房屋科技(石首)有限公司 | Assembly type building frame and quick connection method thereof |
| CN113338539A (en) * | 2021-06-23 | 2021-09-03 | 福建九鼎建设集团有限公司 | Assembled reinforced concrete combination column |
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