Prefabricated floor-prefabricated shear wall connection node and construction method thereof

Abstract

The present invention discloses a prefabricated floor-prefabricated shear wall connection node and a construction method thereof, comprising a lower shear wall, a prefabricated floor, an upper shear wall, a first bolt and a second bolt; the lower shear wall and the upper shear wall are vertically arranged, the upper end surface of the lower shear wall and the lower end surface of the upper shear wall are respectively provided with a first steel plate and a second steel plate, and the upper shear wall is provided with bolt installation grooves on both sides close to the lower end surface; there are two prefabricated floor slabs, the two prefabricated floor slabs are horizontally arranged and the ends are located between the lower shear wall and the upper shear wall, the two prefabricated floor slabs are connected at the ends by a connecting piece, a third steel plate is provided on the lower side of the prefabricated floor slab, and the third steel plate extends horizontally out of the connected end of the prefabricated floor slab; the first steel plate and the third steel plate are connected through the first bolt; the second steel plate, the prefabricated floor slab and the first steel plate are sequentially connected through the second bolt.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering and prefabricated structures, and relates to a prefabricated floor slab-prefabricated shear wall connection node and a construction method thereof. Background Art

[0002] The connection nodes and construction methods of prefabricated components are key issues in prefabricated concrete structures, especially the connection nodes of prefabricated panels and prefabricated shear walls, which have a great impact on low-carbon green assembly and the overall stress performance of the structure.

[0003] Existing precast panels or composite panels use post-cast concrete to anchor the protruding steel bars of the floor slab to achieve continuous force transmission of the steel bars. The disadvantage is that it is necessary to wait until the concrete is completely solidified and reaches the design strength, and the concrete generally takes 28 days to reach the design strength. When the precast panel is connected to the precast shear wall, the shear wall steel bars are connected by mechanical connectors or grouting sleeve connectors, and a closed ring beam needs to be set at the connection between the precast panel and the shear wall. There are many wet operations on site, the process is complicated, and the labor cost is high, which seriously affects the construction progress. In addition, the shelf length of the floor slab on the precast shear wall is short, and it is difficult to ensure that the secondary cast concrete works together with the original component concrete. The anti-collapse performance under a major earthquake is still unclear, which is not conducive to the rapid and efficient characteristics of assembly. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a prefabricated floor-prefabricated shear wall connection node and a construction method thereof, which has no wet operation and welding work on site, high assembly efficiency and reliable force transmission performance.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A prefabricated floor-prefabricated shear wall connection node, comprising a lower shear wall, a prefabricated floor, an upper shear wall, a first bolt and a second bolt;

[0007] The lower shear wall and the upper shear wall are arranged vertically, the upper end surface of the lower shear wall and the lower end surface of the upper shear wall are respectively provided with a first steel plate and a second steel plate, and both sides of the upper shear wall close to the lower end surface are provided with bolt installation grooves;

[0008] There are two prefabricated floor slabs, the two prefabricated floor slabs are arranged horizontally and the ends are located between the lower shear wall and the upper shear wall, the two prefabricated floor slabs are connected at the ends by a connecting piece, a third steel plate is arranged at the lower side of the prefabricated floor slab, and the third steel plate extends horizontally out of the connected end of the prefabricated floor slab;

[0009] The first steel plate and the third steel plate are connected through the first bolt; the second steel plate, the prefabricated floor slab and the first steel plate are connected through the second bolt in sequence.

[0010] Preferably, a horizontal shear key is provided above the first steel plate of the lower shear wall; and a shear key installation groove is provided at a corresponding position at the bottom of the third steel plate.

[0011] Preferably, the prefabricated floor slab is a hollow slab or a composite slab.

[0012] Preferably, the bolt installation groove is filled with ductile concrete or epoxy resin mortar.

[0013] Preferably, vertical first stress-bearing steel bars and second stress-bearing steel bars are respectively arranged in the lower shear wall and the upper shear wall, and the first stress-bearing steel bars and the second stress-bearing steel bars are respectively connected to the first steel plate and the second steel plate.

[0014] Furthermore, the top of the lower shear wall and the bottom of the upper shear wall are respectively provided with a first web bar and a second web bar. The first web bar connects the first stress-bearing steel bar and the first steel plate, and the second web bar connects the second stress-bearing steel bar and the second steel plate.

[0015] Preferably, the two prefabricated floor slabs are connected by anchoring the ends via a connecting piece.

[0016] Preferably, third stress-bearing steel bars are horizontally arranged on the upper and lower sides of the prefabricated floor slab, and the third stress-bearing steel bars located at the bottom are welded to the third steel plate.

[0017] A construction method for a prefabricated floor slab-prefabricated shear wall connection node based on any one of the above items comprises the following steps:

[0018] The lower shear wall is fixed vertically to the set position, and the two prefabricated floor slabs are placed horizontally on the top of the lower shear wall. The two prefabricated floor slabs are temporarily fixed with bolts; the first steel plate and the third steel plate are connected through the first bolt; the ends of the two prefabricated floor slabs are connected with connecting parts, and the temporarily fixed bolts are taken out, and the end gaps of the prefabricated floor slabs are filled with high-strength ductile materials; the upper shear wall is placed vertically on the top of the two prefabricated floor slabs, and the second steel plate, the prefabricated floor slab, the third steel plate and the first steel plate are connected through the second bolt in turn; after the bolt connection is completed, the bolt installation groove is sealed with ductile concrete or epoxy resin mortar to complete the node assembly.

[0019] Preferably, when two prefabricated floor slabs are placed horizontally on top of the lower shear wall, the shear key installation grooves of the prefabricated floor slabs are spliced ​​with the horizontal shear keys on the first steel plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The lower shear wall, prefabricated floor slab and upper shear wall described in the present invention are connected to form a whole through steel plate combined bolts. The steel plate reliably transmits the tension of the steel bars in the plate. The shear walls resist the tension through bolts. The concrete bears the pressure. The steel plate combined bolts and the bolts jointly bear the horizontal shear force, giving full play to the advantages of material performance, forming a common working mechanism, resisting the node bending moment, and improving the integrity of the node. Bolt tensioning is equivalent to applying prestress to improve the early stiffness of the node. There is no welding operation or wet operation on site. The connection is completed by tightening the bolts, which reduces technical requirements, reduces labor costs, and greatly improves assembly efficiency and connection quality.

[0022] Furthermore, the shear key installation groove at the bottom of the third steel plate and the horizontal shear key at the top of the lower shear wall can effectively resist the horizontal shear force, avoid sliding and falling off during a large earthquake, and ensure the integrity and safety of the structure.

[0023] Furthermore, although the reserved bolt installation groove in the upper shear wall weakens the concrete cross-section, the horizontal and vertical projection areas are reinforced by setting the second web reinforcement, and the yield strength of the reinforcement is much higher than that of the concrete, which is sufficient to compensate for the weakening caused by the bolt installation groove.

[0024] Furthermore, the two prefabricated floor slabs are connected by anchoring at the ends through connectors, which makes on-site operation simple, has a good anchoring effect, and can transmit both tension and compression; the concrete does not directly bear the tension, thus avoiding cracking of the concrete due to tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is an enlarged side view of the connection node of the present invention.

[0027] Among them: 1-lower shear wall; 11-first stress-bearing steel bar; 12-first web bar; 13-first steel plate; 14-horizontal shear key; 2-upper shear wall; 21-second stress-bearing steel bar; 22-second web bar; 23-second steel plate; 24-bolt installation slot; 3-prefabricated floor; 31-third stress-bearing steel bar; 32-third steel plate; 33-floor through hole; 34-shear key installation slot; 4-first bolt; 5-connector; 6-second bolt. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0029] like Figure 1 As shown, the prefabricated floor slab-prefabricated shear wall connection node described in the present invention includes a lower shear wall 1, a prefabricated floor slab 3 and an upper shear wall 2.

[0030] The lower shear wall 1 is vertically arranged, and a first steel plate 13 is arranged on the upper end surface of the lower shear wall 1. Horizontal shear keys 14 are arranged on both sides above the first steel plate 13 of the lower shear wall 1; a plurality of first bolt holes for the first bolts 4 to pass through are arranged at the center position of the first steel plate 13, and a plurality of second bolt holes for the second bolts 6 to pass through are arranged at both sides of the first steel plate 13, such as Figure 2 As shown, a plurality of bolt holes are arranged in two rows; a plurality of vertical first stress-bearing steel bars 11 are arranged in the lower shear wall 1, and the first stress-bearing steel bars 11 are connected to the first steel plate 13; a plurality of first web bars 12 are arranged on the top of the lower shear wall 1, and the first web bars 12 connect the first stress-bearing steel bars 11 and the first steel plate 13, and the three form a triangular structure.

[0031] The upper shear wall 2 is vertically arranged, and a second steel plate 23 is arranged on the lower end surface of the upper shear wall 2. A plurality of bolt installation grooves 24 are respectively arranged on both sides of the upper shear wall 2 close to the lower end surface. The plurality of bolt installation grooves 24 are vertically arranged side by side on each side of the upper shear wall 2, and the second steel plate 23 is provided with a first bolt circular hole at the bolt installation groove 24; Figure 2 As shown, a plurality of vertical second stress-bearing steel bars 21 are arranged in the upper shear wall 2, and the second stress-bearing steel bars 21 are connected to the second steel plate 23; a plurality of second web bars 22 are arranged at the bottom of the upper shear wall 2, and the second web bars 22 are connected to the second stress-bearing steel bars 21 and the second steel plate 23, and the three form a triangular structure.

[0032] The prefabricated floor 3 adopts a hollow slab or a composite slab. There are two prefabricated floor slabs 3. The two prefabricated floor slabs 3 are horizontally arranged and the ends are located between the lower shear wall 1 and the upper shear wall 2. A third steel plate 32 is arranged on the lower side of the prefabricated floor slab 3. Third stress-bearing steel bars 31 are horizontally arranged on the upper and lower sides of the prefabricated floor slab 3. The third stress-bearing steel bars 31 located at the bottom are welded to the third steel plate 32, and the third steel plate 32 and the third stress-bearing steel bars 31 extend horizontally out of the connected end of the prefabricated floor slab 3.

[0033] A horizontal shear key 14 is arranged above the first steel plate 13 of the lower shear wall 1; a shear key mounting groove 34 is arranged at a corresponding position at the bottom of the third steel plate 32. The cooperation between the horizontal shear key 14 and the shear key mounting groove 34 can effectively resist the horizontal shear force, avoid the problem of sliding and falling off during a large earthquake, and ensure the integrity and safety of the structure.

[0034] The two prefabricated floor slabs 3 are connected by anchoring at their ends through a connector 5. The length of the third stress-bearing steel bar 31 on the top of the prefabricated floor slab 3 extending out of the prefabricated floor slab 3 is not less than the anchoring length of the connector 5. The connector 5 is connected to the third stress-bearing steel bar 31 on the top of the prefabricated floor slab 3 and is tightened and fixed by bolts.

[0035] The third steel plate 32 of the prefabricated floor 3 is provided with a plurality of second bolt circular holes for the first bolts 4 to pass through, and the positions of the second bolt circular holes correspond to the positions of the first bolt threads. The prefabricated floor 3 is provided with a plurality of floor through holes 33 for the second bolts 6 to pass through, and the positions of the floor through holes 33, the second bolt threads and the first bolt circular holes correspond to each other.

[0036] The first bolt 4 penetrates and connects the first steel plate 13 and the third steel plate 32 through the second bolt circular hole and the first bolt thread hole; the second bolt 6 penetrates and connects the second steel plate 23, the prefabricated floor 3 and the first steel plate 13 in sequence through the first bolt circular hole, the floor through hole 33 and the second bolt thread hole.

[0037] The inner diameter of the floor through hole 33 is greater than the bolt diameter by more than 5 mm, which is convenient for hole connection and can be filled with high-strength materials after the bolt passes through.

[0038] The first steel plate 13 , the second steel plate 23 and the third steel plate 32 are all made of high-strength steel plates; the first bolt 4 and the second bolt 6 are made of high-strength bolts.

[0039] Prefabricated lower shear wall 1: A first steel plate 13 with a first bolt thread hole is embedded in the top of the lower shear wall 1, the first force-bearing steel bars 11 and the first web steel bars 12 are welded to the embedded first steel plate 13, the steel bars are tied and concrete is poured and cured to the age.

[0040] Prefabricated upper shear wall 2: A second steel plate 23 with a first bolt circular hole is embedded in the bottom end of the upper shear wall 2, the second force-bearing steel bars 21 and the second web steel bars 22 are welded to the embedded second steel plate 23, the steel bars are tied and concrete is poured and cured to the age.

[0041] Precast slab 3: arrange the third stress-bearing steel bars 31 of the upper and lower layers of the precast slab 3, and weld the third stress-bearing steel bars 31 at the lower part of the precast slab 3 to the third steel plate 32, open the second bolt circular hole on the third steel plate 32, reserve a vertical slab through hole 33 at the end of the precast slab 3, the position of the slab through hole 33 corresponds to the position of the second bolt thread hole and the first bolt circular hole, and local reinforcement measures are taken for the hole wall of the slab through hole 33; reserve a shear key installation groove 34 at the bottom of the third steel plate 32; the length of the third stress-bearing steel bar 31 on the top of the precast slab 3 extending out of the precast slab 3 is not less than the anchoring length of the connecting piece 5, support the formwork, tie the steel bars, pour the concrete and maintain the shape.

[0042] The process of on-site assembly and connection of the prefabricated floor slab-prefabricated shear wall connection node of the present invention is as follows:

[0043] Hoist the lower shear wall 1 to the designed position, and after temporary fixation, hoist the two prefabricated floor slabs 3 to the designed height, align the horizontal shear key 14 into the groove, align the second bolt circular hole of the third steel plate 32 at the bottom of the prefabricated floor slab 3 with the first bolt thread hole of the lower shear wall 1, and temporarily fix the floor slab through hole 33 and the second bolt thread hole with bolts.

[0044] The first bolt 4 is passed through the second round bolt hole of the third steel plate 32 at the bottom of the prefabricated floor slab 3, and then screwed into the first bolt thread hole of the first steel plate 13 embedded at the top of the lower shear wall 1. After confirmation, tighten the first bolt 4.

[0045] Connect the third stress-bearing steel bars 31 on the tops of the two prefabricated floor slabs 3 with the connecting piece 5, tighten and fix, remove the temporary fixing bolts of the floor slab through holes 33 of the prefabricated floor slab 3; fill the gap between the connecting end faces of the two prefabricated floor slabs 3 with high-strength ductility material.

[0046] Lift the upper shear wall 2 to the designed position, adjust and align the first bolt hole of the second steel plate 23 at the bottom of the upper shear wall 2, the floor through hole 33 and the second bolt thread hole of the first steel plate 13 of the lower shear wall 1. After confirming that they are correct, pass the second bolt 6 through the bolt installation groove 24 at the bottom of the upper shear wall 2 through the first bolt hole of the second steel plate 23 at the bottom of the upper shear wall 2, the floor through hole 33 and the second bolt thread hole of the first steel plate 13 of the lower shear wall 1 in sequence, adjust the vertical deviation of the shear wall, and tighten all the second bolts 6 after confirming that they are correct.

[0047] After the bolt connection is completed, the bolt installation groove 24 is sealed with ductile concrete or epoxy resin mortar to prevent loosening and rusting, and the node assembly is completed.

[0048] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A prefabricated floor-prefabricated shear wall connection node, characterized in that: It comprises a lower shear wall (1), a prefabricated floor slab (3), an upper shear wall (2), a first bolt (4) and a second bolt (6); The lower shear wall (1) and the upper shear wall (2) are arranged vertically, the upper end surface of the lower shear wall (1) and the lower end surface of the upper shear wall (2) are respectively provided with a first steel plate (13) and a second steel plate (23), and bolt installation grooves (24) are provided on both sides of the upper shear wall (2) close to the lower end surface; There are two prefabricated floor slabs (3), the two prefabricated floor slabs (3) are arranged horizontally and their ends are located between the lower shear wall (1) and the upper shear wall (2), the two prefabricated floor slabs (3) are connected at their ends by a connecting piece (5), a third steel plate (32) is arranged on the lower side of the prefabricated floor slab (3), and the third steel plate (32) extends horizontally out of the connected end of the prefabricated floor slab (3); The first steel plate (13) and the third steel plate (32) are connected through a first bolt (4); the second steel plate (23), the prefabricated floor slab (3) and the first steel plate (13) are connected through a second bolt (6) in sequence; A horizontal shear key (14) is provided above the first steel plate (13) of the lower shear wall (1); a shear key installation groove (34) is provided at a corresponding position at the bottom of the third steel plate (32); The prefabricated floor slab (3) is a hollow slab or a composite slab.

2. The prefabricated floor-prefabricated shear wall connection node according to claim 1, characterized in that: The bolt installation groove (24) is filled with ductile concrete or epoxy resin mortar.

3. The prefabricated floor-prefabricated shear wall connection node according to claim 1, characterized in that: A first vertical stress-bearing steel bar (11) and a second vertical stress-bearing steel bar (21) are respectively arranged in the lower shear wall (1) and the upper shear wall (2); the first vertical stress-bearing steel bar (11) and the second vertical stress-bearing steel bar (21) are respectively connected to the first steel plate (13) and the second steel plate (23).

4. The prefabricated floor-prefabricated shear wall connection node according to claim 3, characterized in that: A first web steel bar (12) and a second web steel bar (22) are respectively arranged at the top of the lower shear wall (1) and the bottom of the upper shear wall (2); the first web steel bar (12) connects the first force-bearing steel bar (11) and the first steel plate (13); and the second web steel bar (22) connects the second force-bearing steel bar (21) and the second steel plate (23).

5. The prefabricated floor-prefabricated shear wall connection node according to claim 1, characterized in that: The two prefabricated floor slabs (3) are connected by anchoring at their ends via a connecting piece (5).

6. The prefabricated floor-prefabricated shear wall connection node according to claim 1, characterized in that: Third stress-bearing steel bars (31) are horizontally arranged on the upper and lower sides of the prefabricated floor slab (3), and the third stress-bearing steel bars (31) located at the bottom are welded to the third steel plate (32).

7. A construction method for a prefabricated floor-prefabricated shear wall connection node according to any one of claims 1 to 6, characterized in that: The process includes: The lower shear wall (1) is fixed vertically to a set position, and two prefabricated floor slabs (3) are placed horizontally on the top of the lower shear wall (1), and the two prefabricated floor slabs (3) are temporarily fixed by bolts; the first steel plate (13) and the third steel plate (32) are connected by first bolts (4); the ends of the two prefabricated floor slabs (3) are connected by connecting members (5), the temporarily fixed bolts are removed, and the end gaps of the prefabricated floor slabs (3) are filled with high-strength ductile materials; the upper shear wall (2) is placed vertically on the top of the two prefabricated floor slabs (3), and the second steel plate (23), the prefabricated floor slab (3), the third steel plate (32) and the first steel plate (13) are connected by second bolts (6) in sequence; after the bolt connection is completed, the bolt installation groove (24) is sealed with ductile concrete or epoxy resin mortar to complete the node assembly.

8. The construction method of the prefabricated floor-prefabricated shear wall connection node according to claim 7, characterized in that: When two prefabricated floor slabs (3) are placed horizontally on top of the lower shear wall (1), the shear key installation grooves (34) of the prefabricated floor slabs (3) are spliced ​​with the horizontal shear keys (14) on the first steel plate (13).

Images