Construction method for post-pouring connection joint of PEC beam and PEC column

Abstract

The invention relates to a construction method of a PEC beam and PEC column post-pouring connection joint, a steel corbel is welded on a PEC column in advance, grouting holes are respectively formed in two sides, corresponding to a web plate, of an upper flange of the steel corbel, a steel sleeve is welded at each grouting hole, and the length of each steel sleeve is greater than the thickness of a floor; sealing plates are welded to the two sides of a web at the connecting end of the PEC beam, angle steel is welded to an upper flange and a lower flange on the two sides of a steel corbel web and an upper flange and a lower flange on each side of a web on the outer side of each sealing plate, the steel corbel and the connecting end of the PEC beam are fixed through a connecting steel plate and high-strength bolts on a construction site, and then the flanges of the steel corbel and the flanges of the PEC beam are welded. And then connecting rod steel bars are welded to the two sides of the web of the joint area, second formworks are fixed to the angle steel on the two sides of the web of the joint area, and finally grouting is conducted on the joint area through the steel sleeve. The number of on-site formworks is small, the grouting compactness of the node area from the top is good, and the construction speed can be increased.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings, and in particular to a construction method for post-casting connection nodes between PEC beams and PEC columns. Background Art

[0002] When partially encased steel-concrete composite beams (PEC beams) and partially encased steel-concrete composite columns (PEC columns) are connected by post-casting, the following is usually done: Figures 1 to 3 As shown, a steel corbel 13 is welded to the PEC column 1, and the end of the PEC beam 2 is fixed to the steel corbel 13 through the connecting steel plate 3 with high-strength bolts 9. Then, steel bars are welded on site in the connection area, and finally, concrete is poured on site in the connection area. The on-site pouring of concrete requires on-site formwork on both sides of the PEC beam 2, such as Figure 3 As shown, first templates 6 are provided on both sides of the web in the connection area, and wedge-shaped pouring ports 7 are left on the upper portion of the first templates 6 to facilitate grouting from the sides of the web.

[0003] The construction method in the above-mentioned prior art, because the first template 6 is provided with a wedge-shaped pouring opening 7, forms a wedge-shaped groove at the wedge-shaped pouring opening 7 after the concrete is poured. This groove needs to be removed later, which is very cumbersome. Furthermore, the number of on-site formwork is large, the pouring cost is high, and the construction steps are numerous. Moreover, pouring concrete from the side of the web is not easy to compact and is difficult to fill completely, thus posing certain safety hazards. In addition, since the PEC beam 2 needs to be connected to the floor slab 5, if a cast-in-place floor slab is used, the PEC beam-column joint can be cast simultaneously with the floor slab 5. However, if a prefabricated floor slab or floor deck is used, it is necessary to reserve a pouring opening at the PEC beam-column connection node in advance and then cast it simultaneously with the floor slab 5. If the floor slab 5 is poured on site first, it is difficult to complete the pouring of the PEC beam-column joint area. Therefore, the construction method in the above-mentioned prior art is cumbersome, and the pouring of the floor slab 5 and the pouring of the connection joint area may have a certain order, which in turn affects the construction progress. Summary of the Invention

[0004] The invention discloses a construction method for post-casting connection nodes between PEC beams and PEC columns. The number of on-site formwork is small, and the node area is grouted from the top, which can ensure good density of the node area. The pouring of the node area and the pouring of the floor slab do not affect each other, which can improve the construction speed.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A construction method for a post-cast connection node between a PEC beam and a PEC column comprises the following steps:

[0007] Step 1): Prefabricate PEC columns and PEC beams in the factory;

[0008] Step 2): Weld a steel corbel to the flange of the PEC column. Open a hole on the web of the steel corbel. Set grouting holes on both sides of the upper flange of the steel corbel corresponding to the web. Weld a steel sleeve perpendicular to the upper flange at each grouting hole. Weld an angle steel to the bottom surface of the upper flange and the top surface of the lower flange on each side of the steel corbel web. One side of the angle steel is flush with the side surface of the steel corbel flange.

[0009] At both ends of the PEC beam, sealing plates are welded between the two sides of the web. The sealing plates are fixed vertically to the web and flange. Holes are opened on the web outside the sealing plates. Angle steels are welded to the bottom surface of the upper flange and the top surface of the lower flange on each side of the web outside the sealing plates. One side of the angle steel is flush with the side surface of the flange of the PEC beam.

[0010] Step 3): Complete the installation of PEC columns at the construction site;

[0011] Step 4): Hoist the PEC beam so that the connection end of the PEC beam is butted against the steel bracket. Connecting steel plates are respectively provided on both sides of the web of the node area where the steel bracket and the PEC beam are connected. The connecting steel plates are then fixed to the web connection of the node area with high-strength bolts.

[0012] Step 5): Weld the flange of the steel corbel to the flange of the PEC beam on site;

[0013] Step 6): Connecting rod reinforcement is set on both sides of the web in the node area, and the two ends of the connecting rod reinforcement are welded to the upper and lower flanges;

[0014] Step 7): Set up second templates on both sides of the web in the node area, and fix the second template on each side to the angle steel on the same side;

[0015] Step 8): Grouting the node area through the steel sleeve;

[0016] Step 9): After curing, remove the second template.

[0017] Furthermore, the grouting holes on the upper flanges of the steel corbels on both sides of the web are staggered with each other.

[0018] Furthermore, the inner diameter of the steel sleeve is larger than the inner diameter of the grouting hole.

[0019] Furthermore, the length of the steel sleeve is not less than the thickness of the floor slab.

[0020] The present invention presets a steel sleeve on the upper flange of the steel corbel connected to the PEC column. When the node area is cast on site, grouting can be performed from the top through the steel sleeve, so the node area can be filled and solid. In addition, the reserved steel sleeve length is greater than the thickness of the floor slab. The grouting holes of the steel sleeve will not be blocked when the floor slab is cast. The casting of the floor slab and the casting of the node area can be carried out alternately without affecting each other. The present invention pre-welds the angle steel for fixing the template on the flange of the node area. When supporting the template on site, the template can be directly fitted to the side of the flange and fixed on the angle steel. Compared with the supporting template structure in the prior art, there is no wedge-shaped pouring port, the number of templates used is small, and the construction speed on site can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the connection node between PEC beam and PEC column in the prior art;

[0022] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0023] Figure 3 for Figure 2 Cross-sectional view at point aa;

[0024] Figure 4 Schematic diagram of the connection node between the PEC beam and the PEC column in an embodiment of the present invention;

[0025] Figure 5 for Figure 4 Cross-sectional view at the middle BB;

[0026] Figure 6 for Figure 5 Cross-sectional view at point bb in the middle.

[0027] Reference numerals:

[0028] 1. PEC column; 2. PEC beam; 3. Connecting steel plate; 4. Connecting rod reinforcement; 5. Floor slab; 6. First formwork; 7. Wedge-shaped pouring gate; 8. Closing plate; 9. High-strength bolts; 10. Angle steel; 11. Steel sleeve; 12. Grouting hole; 13. Steel corbel; 14. Second formwork. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] This embodiment discloses a construction method for a post-cast connection node between a PEC beam and a PEC column, wherein the structure of the connection node is as follows: Figures 4 to 6 As shown, the entire connection node is constructed according to the following steps:

[0031] Step 1): The factory completes the prefabrication of the PEC column 1 and the PEC beam 2. The structures of the PEC column 1 and the PEC beam 2 can be prefabricated according to existing technology.

[0032] Step 2): Weld a steel corbel 13 on the flange of the PEC column 1, wherein the steel corbel 13 is an H-shaped steel, and a hole is opened on the web of the steel corbel 13. A grouting hole 12 is opened on each side of the upper flange of the steel corbel 13 corresponding to the web. A steel sleeve 11 is welded perpendicular to the upper flange at each grouting hole 12. The inner diameter of the steel sleeve 11 is 2 mm larger than the inner diameter of the grouting hole 12 to facilitate grouting. The length of the steel sleeve 11 must not be less than the thickness of the floor slab 5 to avoid blocking the grouting hole of the steel sleeve 11 when the floor slab 5 is cast first. The two grouting holes 12 opened on the upper flange of the steel corbel 13 need to be staggered to avoid stress concentration and large deformation caused by cutting and welding the same section. The steel sleeve 11 is used for top grouting during post-casting of the node area to avoid blocking the opening when pouring the floor slab 5. The thickness and length of the steel sleeve 11 should be sufficient to reduce the weakening of the component strength caused by the opening of the grouting opening 12 at the flange end, ensuring that the bearing capacity of the connection position is not less than the bearing capacity of the main steel component before the grouting opening 12 is opened. Angle steel 10 is welded to the bottom surface of the upper flange and the top surface of the lower flange on each side of the web of the steel corbel 13, so that one side of the angle steel 10 is flush with the side surface of the flange of the steel corbel 13.

[0033] At the same time, sealing plates 8 are welded to both ends of the PEC beam 2 between the two sides of the web. The sealing plates 8 are fixed vertically to the web and flanges. The top of the sealing plate 8 is welded to the upper flange of the PEC beam 2, the bottom of the sealing plate 8 is welded to the lower flange of the PEC beam 2, and the inner side of the sealing plate 8 is welded to the web of the PEC beam 2. A hole is opened in the web of the sealing plate 8 facing the steel corbel 13, and angle steels 10 are welded to the bottom surface of the upper flange and the top surface of the lower flange on each side of the web of the sealing plate 8 facing the steel corbel 13, so that one side of the angle steel 10 is flush with the side of the flange of the PEC beam 2. The angle steels 10 on both sides of the web of the steel corbel 13 and the angle steels 10 on the outside of the sealing plate 8 of the PEC beam 2 are used to fix the formwork during the casting of the node area. The preset angle steels 10 can simplify the on-site formwork steps.

[0034] Step 3): Complete the installation of PEC column 1 at the construction site first.

[0035] Step 4): After installing the PEC column 1, hoist the PEC beam 2 so that the connection end of the PEC beam 2 is docked with the steel corbel 13. The steel corbel 13 and the outer side of the cover plate 8 form a node area. Connecting steel plates 3 are respectively set on both sides of the web of the node area. Use high-strength bolts 9 to fix the connecting steel plates 3 at the web connection of the node area, thereby connecting and fixing the steel corbel 13 to the PEC beam 2.

[0036] Step 5): After the connection between the steel corbel 13 and the PEC beam 2 is completed, the upper and lower flanges of the steel corbel 13 and the upper and lower flanges of the PEC beam 2 are welded on site.

[0037] Step 6): After completing step 5), connecting rod reinforcement 4 is arranged parallel to the web on both sides of the web in the node area, and the two ends of the connecting rod reinforcement 4 are welded to the upper and lower flanges respectively.

[0038] Step 7): After completing step 6), set up the second template 14 on both sides of the web in the node area, and fix the second template 14 on each side to the angle steel 10 on the same side. To facilitate the removal of the second template 14, the second template 14 can be made of wood and fixed by nailing.

[0039] Step 8): After the installation of the second formwork 14 is completed, grouting is respectively performed on both sides of the web of the node area through the two steel sleeves 11. Since grouting is performed from the top, it can be ensured that the node area is filled and solid.

[0040] Step 9): After the concrete in the node area is cured, the second formwork 14 can be removed.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for post-casting connection nodes between PEC beams and PEC columns, characterized in that: The steps include: Step 1): Prefabricate PEC columns and PEC beams in the factory; Step 2): Weld a steel corbel to the flange of the PEC column. Open a hole on the web of the steel corbel. Set grouting holes on both sides of the upper flange of the steel corbel corresponding to the web. Weld a steel sleeve perpendicular to the upper flange at each grouting hole. Weld an angle steel to the bottom surface of the upper flange and the top surface of the lower flange on each side of the steel corbel web. One side of the angle steel is flush with the side surface of the steel corbel flange. At both ends of the PEC beam, sealing plates are welded between the two sides of the web. The sealing plates are fixed vertically to the web and flange. Holes are opened on the web outside the sealing plates. Angle steels are welded to the bottom surface of the upper flange and the top surface of the lower flange on each side of the web outside the sealing plates. One side of the angle steel is flush with the side surface of the flange of the PEC beam. Step 3): Complete the installation of PEC columns at the construction site; Step 4): Hoist the PEC beam so that the connection end of the PEC beam is butted against the steel bracket. Connecting steel plates are respectively provided on both sides of the web of the node area where the steel bracket and the PEC beam are connected. The connecting steel plates are then fixed to the web connection of the node area with high-strength bolts. Step 5): Weld the flange of the steel corbel to the flange of the PEC beam on site; Step 6): Connecting rod reinforcement is set on both sides of the web in the node area, and the two ends of the connecting rod reinforcement are welded to the upper and lower flanges; Step 7): Set up second templates on both sides of the web in the node area, and fix the second template on each side to the angle steel on the same side; Step 8): Grouting the node area through the steel sleeve; Step 9): After curing, remove the second template.

2. The construction method of a post-cast connection node between a PEC beam and a PEC column according to claim 1, characterized in that: The upper flanges of the steel corbels are located at the grouting holes on both sides of the web and are staggered with each other.

3. The construction method of a post-cast connection node between a PEC beam and a PEC column according to claim 1, characterized in that: The inner diameter of the steel sleeve is larger than the inner diameter of the grouting hole.

4. The construction method of a post-cast connection node between a PEC beam and a PEC column according to claim 1, characterized in that: The length of the steel sleeve is not less than the thickness of the floor slab.

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