CN210141019U - Embedded profile steel type underpinning node - Google Patents
Embedded profile steel type underpinning node Download PDFInfo
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- CN210141019U CN210141019U CN201920626276.9U CN201920626276U CN210141019U CN 210141019 U CN210141019 U CN 210141019U CN 201920626276 U CN201920626276 U CN 201920626276U CN 210141019 U CN210141019 U CN 210141019U
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Abstract
The utility model relates to an embedded shaped steel formula underpins node, a serial communication port, including underpinning post (1), set up underpinning roof beam (2) in underpinning post (1) both sides, set up in underpinning other both sides of post (1) and connecting tie beam (3) of underpinning roof beam (2), underpinning inside connecting steel plate (4) that is provided with of roof beam (2), the both ends of connecting steel plate (4) are fixed with L shaped steel (5), still be provided with between connecting steel plate (4) and to drawing screw rod (6). Compared with the prior art, the utility model provides the rigidity and the overall stability that improve the underpinning node bearing capacity, increase underpinning node, save the reinforcing bar quantity.
Description
Technical Field
The utility model relates to a ask to trade the node, especially relate to an embedded shaped steel formula asks to trade node.
Background
The underpinning of the structure is an important link in the displacement and jacking engineering of the building (structure), and directly influences whether the displacement and jacking engineering of the building (structure) is successful or not. The underpinning technology is that the load of the original building is effectively transmitted to an underpinning structure, and the upper building is supported by the underpinning structure so as to be reformed or displaced. Common column underpinning node forms include column beam column underpinning, profile steel split bolt underpinning and the like. The beam type column underpinning method of the reinforced concrete column-embracing is widely applied due to small construction difficulty, simple structure and wide application range, but the underpinning node has limited bearing capacity and usually needs to chisel the surface of the column or penetrate reinforcing steel bars in the column to cause certain damage to the column. The sectional steel split bolt underpinning node has the advantages of complex structure and difficult construction, and can damage the original column, so that the application in the actual engineering is less.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an embedded shaped steel formula underpins node in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides an embedded shaped steel formula underpins node, includes the underpinning post, sets up the underpinning roof beam in underpinning post both sides, sets up in the other both sides of underpinning post and connect the tie beam of underpinning roof beam, the inside connecting steel plate that is provided with of underpinning roof beam, the both ends of connecting steel plate are fixed with L shaped steel, still be provided with between the connecting steel plate and to drawing the screw rod.
Further, the thickness of the connecting steel plate is not less than 10mm, so that the rigidity of the connecting steel plate is ensured.
Furthermore, the underpinning beam comprises primary concrete and secondary concrete which are poured twice, and the connecting steel plate is arranged on a contact interface of the primary concrete and the secondary concrete.
Furthermore, the width of the first-stage concrete and the second-stage concrete is 100-300mm, and the width of the underpinning beam is not more than 500 mm.
Furthermore, embedded steel bars are welded on one side of the contact surface of the connecting steel plate and the first-stage concrete, so that the effective connection between the connecting steel plate and the first-stage concrete is guaranteed.
Furthermore, the diameter of each embedded steel bar is not less than 8mm and not more than 25mm, and the distance between every two adjacent embedded steel bars is not less than three times of the diameter of each embedded steel bar, not less than 45mm and not more than 300 mm.
Furthermore, one limb of the L-shaped steel is welded with the connecting steel plate, and the outer side of the other limb is welded with the shear-resistant stud, so that the effective connection between the L-shaped steel and the second-stage concrete is ensured.
Furthermore, the distance between the shear pins is not more than 250mm, the distance between the shear pins in the direction parallel to the axial line of the underpinning beam is not less than six times of the diameter of the shear pins, and the distance between the shear pins in the direction perpendicular to the axial line of the underpinning beam is not less than four times of the diameter of the shear pins.
Furthermore, the L-shaped steel and the connecting steel plate are welded through full penetration of a groove, so that the reliability of welding connection is ensured.
Furthermore, a PVC sleeve is reserved outside the counter-pulling screw rod, the counter-pulling screw rod penetrates through the PVC sleeve to be fixedly connected to the L-shaped steel and the connecting steel plate through bolts, and when the PVC sleeve prevents concrete from being poured, the counter-pulling screw rod is bonded with the concrete, so that the counter-pulling screw rod cannot be used.
Furthermore, the inner diameter of the PVC sleeve is 2-5mm larger than the diameter of the counter screw.
Furthermore, the diameter of the counter-pulling screw rod is 12-25mm, so that the counter-pulling screw rod can effectively apply pre-pressure on a contact interface of the underpinning beam and the underpinning column.
Furthermore, a bolt hole is formed in the penetrating position of the opposite-pulling screw rod of one limb of the L-shaped steel welded with the connecting steel plate, the diameter of the bolt hole is 2-5mm larger than that of the opposite-pulling screw rod, and the bolt hole of the L-shaped steel is aligned with the bolt hole of the connecting steel plate, so that smooth opposite pulling of the bolt is guaranteed.
A manufacturing and using method of an embedded steel type underpinning node comprises the following steps:
the method comprises the following steps: arranging bolt holes in the positions of the abdomen of the connecting steel plate according to design requirements, then performing pre-buried steel bar perforation plug welding on the connecting steel plate, and fixing the pre-buried steel bar perforation plug welding on the preset design positions on two sides of the underpinning column;
step two: binding longitudinal steel bars and stirrups of the connecting beam on the other two sides of the underpinning column, and embedding PVC sleeves in the design positions of the counter-pulling screws;
step three: pouring first-stage concrete of the underpinned beam and concrete of the connecting beam;
step four: arranging bolt holes in corresponding positions of the L-shaped steel according to design requirements, welding one limb of the L-shaped steel provided with the bolt holes on the connecting steel plate, and welding a shear-resistant stud on the other limb of the L-shaped steel;
step five: after the initial setting and before the final setting of the first-stage concrete of the underpinning beam and after the strength of the concrete reaches 75% of the designed strength, penetrating screw rods in the L-shaped steel, the orifice position of the connecting steel plate and a PVC sleeve, and screwing nuts, so as to apply prestress on a contact interface of the underpinning beam and the underpinning column;
step six: and pouring the second-stage concrete of the underpinning beam, after the second-stage concrete reaches the designed strength, installing a shifting roller below the underpinning beam, cutting the underpinning column, and underpinning and shifting the building.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the underpinning node is internally provided with the counter-pulling screw rod, when the underpinning node is manufactured, the counter-pulling screw rod is tensioned, so that pre-pressure is applied to a contact interface of the underpinning beam and the underpinning column, the shearing resistance bearing capacity of the underpinning interface is improved, and the bearing capacity of the underpinning node is improved.
(2) One limb of the L-shaped steel welding shear-resistant stud can be used as a longitudinal steel bar of the underpinning beam, and the other limb of the connecting steel plate and the L-shaped steel can be used as a shear-resistant hoop of the underpinning beam, so that the using amount of the steel bar can be saved; in addition, the steel content of the L-shaped steel and the connecting steel plate is greater than the reinforcement ratio and the hoop ratio of the common underpinning beam, so that the bearing capacity of the underpinning beam can be improved.
(3) Concrete is poured outside the L-shaped steel and the connecting steel plate, so that a steel reinforced concrete beam is formed, and the rigidity and the overall stability of the underpinning node can be improved.
Drawings
Fig. 1 is a cross-sectional view of the present invention;
FIG. 2 is a cross-sectional view of section A-A of FIG. 1;
FIG. 3 is a cross-sectional view of section B-B of FIG. 2;
FIG. 4 is a front view of the connecting steel plate;
FIG. 5 is a side view of the connecting steel plate;
FIG. 6 is a front view of the L-shaped steel;
FIG. 7 is a side view of the L-shaped steel.
The reference numbers in the figures indicate:
1-underpinning a column; 2, underpinning the beam; 21-first stage concrete; 22-second stage concrete; 3-connecting the beam; 4-connecting steel plates; 5-L section steel; 6-oppositely pulling the screw rod; 7-embedding reinforcing steel bars; 8-shear resistant studs; 9-PVC sleeves; 10-bolt hole.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
As shown in fig. 1 to 3, an embedded type steel type underpinning node comprises: underpinning columns 1, underpinning beams 2, connecting beams 3, connecting steel plates 4 (figures 4-5) and L-shaped steel 5 (figures 6-7). The underpinning beams 2 are symmetrically arranged at two sides of the underpinning column 1 and are poured twice to form first-stage concrete 21 and second-stage concrete 22. The connecting steel plate 4 is arranged on a contact interface of the first-stage concrete 21 and the second-stage concrete 22, the L-shaped steel 5 is oppositely arranged at the top and the bottom of the second-stage concrete 22, and one limb of the L-shaped steel 5 is connected with the connecting steel plate 4 in a welding mode. The connecting beams 3 are symmetrically arranged on the other two sides of the underpinning column 1 and are poured together with the first-stage concrete 21 to form an integral structure.
The underpinning beam 2 is poured for two times to form first-stage concrete 21 and second-stage concrete 22. The width of the first-stage concrete 21 and the second-stage concrete 22 is 100-300mm, and the total width of the underpinning beam 2 is not more than 500 mm.
The connecting steel plate 4 is arranged at the contact position of the first-stage concrete 21 and the second-stage concrete 22, a bolt hole 10 is formed in the passing position of the split bolt, and in order to ensure that the split screw 6 can pass through the bolt hole 10, the diameter of the bolt hole 10 is 2-5mm larger than that of the split screw 6. In order to ensure the rigidity of the connecting steel plate 4, the thickness of the connecting steel plate 4 should not be less than 10 mm. In order to ensure the effective connection between the connecting steel plate 4 and the first-stage concrete 21, the embedded steel bars 7 are welded on one side of the contact surface between the connecting steel plate 4 and the first-stage concrete 21. The diameter of the embedded steel bars 7 is not less than 8mm and not more than 25mm, the distance between the embedded steel bars 7 is not less than 3d and not less than 45mm and not more than 300mm, and d is the diameter of the embedded steel bars 7.
One limb of the L-shaped steel 5 is welded with the connecting steel plate 4, and in order to ensure the reliability of the welding connection, the welding mode is the full penetration welding with a split. A bolt hole 10 is arranged at the position where the opposite-pulling screw 6 penetrates through one limb of the L-shaped steel 5 and the connecting steel plate 4 in a welded mode, the diameter of the bolt hole 10 is 2-5mm larger than that of the opposite-pulling screw 6 for ensuring smooth opposite pulling of the bolt, and the bolt hole 10 in the L-shaped steel 5 is aligned with the bolt hole 10 in the connecting steel plate 4.
In order to ensure the effective connection between the L-shaped steel 5 and the second-stage concrete 22, the outer side of the other limb of the L-shaped steel 5 is welded with the shear-resistant studs 8, the distance between the shear-resistant studs 8 is not more than 250mm, the distance between the shear-resistant studs and the underpinning beam 2 in the axial direction is not more than 6d, the distance between the shear-resistant studs and the underpinning beam 2 in the axial direction is not more than 4d, wherein d is the diameter of the shear-resistant studs 8.
The connecting beam 3 and the first-stage concrete 21 are poured at the same time, and the PVC sleeve 9 is embedded in the first-stage concrete 21 and the connecting beam 3 before the concrete is poured.
The opposite-pulling screw rod 6 penetrates through the L-shaped steel 5, the bolt hole 10 of the connecting steel plate 4 and the PVC sleeve 9 and is fixed on the L-shaped steel 5 and the connecting steel plate 4 through nuts. In order to ensure that the counter-pulling screw 6 can effectively apply pre-pressure on the contact interface of the underpinning beam 2 and the underpinning column 1, the diameter of the counter-pulling screw 6 is not less than 12mm and not more than 25 mm.
The first stage concrete 21 should be prestressed by tensioning the split bolts after initial setting and before final setting to reach 75% of the design strength.
The manufacturing and using steps of the embedded steel type underpinning node are as follows:
the method comprises the following steps: according to the design requirement, a bolt hole 10 is arranged at the belly position of the connecting steel plate 4, then the embedded steel bar 7 is subjected to plug welding on the connecting steel plate 4 through a hole, and the embedded steel bar 7 is fixed at the preset design positions at two sides of the underpinning column 1.
Step two: binding longitudinal steel bars and stirrups of the connecting beam 3 on the other two sides of the underpinning column 1, and embedding PVC sleeves 9 at the design positions of the opposite-pulling screw rods 6.
Step three: and pouring primary concrete 21 and connecting beam 3 concrete.
Step four: according to design requirements, bolt holes 10 are formed in corresponding positions of the L-shaped steel 5, then one limb of the L-shaped steel 5 provided with the bolt holes 10 is welded on the connecting steel plate 4, and the shear resistant stud 8 is welded on the other limb of the L-shaped steel 5.
Step five: after the initial setting and before the final setting of the first-stage concrete 21 and after the strength of the concrete reaches 75% of the designed strength, the screw rods are penetrated through the L-shaped steel 5, the orifice positions of the connecting steel plates 4 and the PVC sleeve 9, and the nuts are screwed, so that the prestress is applied to the contact interface of the underpinning beam 2 and the underpinning column 1.
Step six: and pouring second-stage concrete 22, after the second-stage concrete reaches the designed strength, installing a shifting roller below the underpinning beam 2, cutting the underpinning column 1, and underpinning and shifting the building.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the disclosure of the present invention.
Claims (10)
1. The utility model provides an embedded shaped steel formula underpins node, its characterized in that, includes underpinning post (1), sets up underpinning roof beam (2) in underpinning post (1) both sides, sets up in underpinning other both sides of post (1) and connect connection roof beam (3) of underpinning roof beam (2), underpinning roof beam (2) inside is provided with connecting plate (4), the both ends of connecting plate (4) are fixed with L shaped steel (5), still be provided with between connecting plate (4) to drawing screw rod (6).
2. An in-line profiled bar underpinning node as claimed in claim 1, characterized in that said underpinning beam (2) comprises primary concrete (21) and secondary concrete (22) poured in two portions, said connecting steel plate (4) being provided at the contact interface of the primary concrete (21) and the secondary concrete (22).
3. The embedded steel type underpinning node as claimed in claim 2, wherein the width of the first stage concrete (21) and the second stage concrete (22) is 100-300mm, and the width of the underpinning beam (2) is not more than 500 mm.
4. The embedded steel type underpinning node as claimed in claim 2, wherein the embedded steel bars (7) are welded on one side of the contact surface of the connecting steel plate (4) and the first-stage concrete (21) of the underpinning beam (2).
5. The embedded steel type underpinning node as claimed in claim 4, wherein the diameter of the embedded steel bars (7) is not less than 8mm and not more than 25mm, and the distance between two adjacent embedded steel bars (7) is not less than three times of the diameter of the embedded steel bars (7) and not less than 45mm and not more than 300 mm.
6. An in-line profiled bar underpinning node as claimed in claim 1 wherein the L-section steel (5) is welded to the connecting steel plate (4) on one leg and the shear studs (8) on the outside of the other leg.
7. An in-line profiled bar type underpinning node as claimed in claim 6 wherein the pitch of said shear pins (8) is not more than 250mm, the pitch in the direction parallel to the axis of the underpinning beam (2) is not less than six times the diameter of the shear pins (8) and the pitch in the direction perpendicular to the axis of the underpinning beam (2) is not less than four times the diameter of the shear pins (8).
8. The built-in type steel underpinning node as claimed in claim 1, wherein a PVC sleeve (9) is reserved outside the counter-pulling screw rod (6), and the counter-pulling screw rod (6) is fixedly connected to the L-shaped steel (5) and the connecting steel plate (4) through the PVC sleeve (9) by bolts.
9. An in-line profiled bar underpinning node as claimed in claim 8 characterised in that the inner diameter of the PVC casing (9) is 2-5mm larger than the diameter of the counter-pulling screw (6).
10. An in-line profiled bar underpinning node as claimed in claim 1 wherein said counter-pulling screw (6) has a diameter of 12-25 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920626276.9U CN210141019U (en) | 2019-04-30 | 2019-04-30 | Embedded profile steel type underpinning node |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920626276.9U CN210141019U (en) | 2019-04-30 | 2019-04-30 | Embedded profile steel type underpinning node |
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| Publication Number | Publication Date |
|---|---|
| CN210141019U true CN210141019U (en) | 2020-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920626276.9U Active CN210141019U (en) | 2019-04-30 | 2019-04-30 | Embedded profile steel type underpinning node |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972857A (en) * | 2019-04-30 | 2019-07-05 | 同济大学建筑设计研究院(集团)有限公司 | A kind of embedded fashioned iron formula underpins node |
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2019
- 2019-04-30 CN CN201920626276.9U patent/CN210141019U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972857A (en) * | 2019-04-30 | 2019-07-05 | 同济大学建筑设计研究院(集团)有限公司 | A kind of embedded fashioned iron formula underpins node |
| CN109972857B (en) * | 2019-04-30 | 2024-03-19 | 同济大学建筑设计研究院(集团)有限公司 | Embedded steel type underpinning node |
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