阅读说明：本技术 一种预制楼板-预制剪力墙连接节点及其施工方法 (Prefabricated floor slab-prefabricated shear wall connecting node and construction method thereof ) 是由 段留省 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种预制楼板-预制剪力墙连接节点及其施工方法,包括下剪力墙、预制楼板、上剪力墙、第一螺栓和第二螺栓；下剪力墙和上剪力墙竖直设置,下剪力墙上端面和上剪力墙下端面分别设置有第一钢板和第二钢板,上剪力墙靠近下端面的两侧,设置有螺栓安装槽；预制楼板数量为两块,两块预制楼板水平设置且端部位于下剪力墙和上剪力墙之间,两块预制楼板通过连接件将端部连接,预制楼板下侧设置有第三钢板,第三钢板水平伸出预制楼板的被连接的一端；采用第一螺栓将第一钢板和第三钢板贯穿连接；采用第二螺栓依次将第二钢板、预制楼板和第一钢板贯穿连接。(The invention discloses a prefabricated floor slab-prefabricated shear wall connecting node and a construction method thereof, wherein the prefabricated floor slab-prefabricated shear wall connecting node comprises a lower shear wall, a prefabricated floor slab, 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 mounting grooves close to two sides of the lower end surface; the number of the prefabricated floor slabs is two, the two prefabricated floor slabs are horizontally arranged, the end parts of the two prefabricated floor slabs are located between the lower shear wall and the upper shear wall, the end parts of the two prefabricated floor slabs are connected through connecting pieces, a third steel plate is arranged on the lower side of each prefabricated floor slab, and the third steel plate horizontally extends out of one connected end of each prefabricated floor slab; connecting the first steel plate and the third steel plate in a penetrating manner by adopting a first bolt; and sequentially connecting the second steel plate, the prefabricated floor slab and the first steel plate through a second bolt.)

1. A prefabricated floor slab-prefabricated shear wall connecting node is characterized by comprising 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 vertically arranged, 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 mounting grooves (24) are formed in the two sides, close to the lower end surface, of the upper shear wall (2);

the number of the prefabricated floor slabs (3) is two, the two prefabricated floor slabs (3) are horizontally arranged, the end parts of the two prefabricated floor slabs are located between the lower shear wall (1) and the upper shear wall (2), the end parts of the two prefabricated floor slabs (3) are connected through the connecting piece (5), the lower side of each prefabricated floor slab (3) is provided with a third steel plate (32), and the third steel plate (32) horizontally extends out of the connected end of each prefabricated floor slab (3);

the first steel plate (13) and the third steel plate (32) are connected in a penetrating way by adopting a first bolt (4); and a second steel plate (23), the prefabricated floor slab (3) and the first steel plate (13) are sequentially connected in a penetrating way by adopting a second bolt (6).

2. The precast floor slab-precast shear wall connection node according to claim 1, wherein 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 arranged at the corresponding position of the bottom of the third steel plate (32).

3. The precast floor slab-precast shear wall connection node according to claim 1, wherein the precast floor slab (3) is a hollow slab or a composite slab.

4. The precast floor slab-precast shear wall connection node according to claim 1, wherein the bolt installation groove (24) is filled with ductile concrete or epoxy mortar.

5. The precast floor slab-precast shear wall connection node according to claim 1, wherein the lower shear wall (1) and the upper shear wall (2) are provided therein with vertical first and second stress bars (11, 21), respectively, and the first and second stress bars (11, 21) are connected to the first and second steel plates (13, 23), respectively.

6. The precast floor slab-precast shear wall connection node according to claim 5, wherein the top of the lower shear wall (1) and the bottom of the upper shear wall (2) are provided with first web member reinforcements (12) and second web member reinforcements (22), respectively, the first web member reinforcements (12) connect the first force-receiving reinforcements (11) and the first steel plates (13), and the second web member reinforcements (22) connect the second force-receiving reinforcements (21) and the second steel plates (23).

7. A precast floor slab-precast shear wall connection node according to claim 1, wherein two precast floor slabs (3) are connected with end anchors by means of the connection member (5).

8. The precast floor slab-precast shear wall connection node according to claim 1, wherein the upper and lower sides of the precast floor slab (3) are horizontally provided with third stressed steel bars (31), and the third stressed steel bars (31) positioned below are welded with third steel plates (32).

9. A construction method of the precast floor slab-precast shear wall connection node according to any one of claims 1 to 8, comprising the steps of:

the lower shear wall (1) is vertically fixed to a set position, the two prefabricated floor slabs (3) are horizontally placed at the top of the lower shear wall (1), and the two prefabricated floor slabs (3) are temporarily fixed through bolts; the first steel plate (13) and the third steel plate (32) are connected in a penetrating way by adopting a first bolt (4); the end parts of the two precast floor slabs (3) are connected by adopting a connecting piece (5), the temporarily fixed bolt is taken out, and the gap at the end part connected with the precast floor slabs (3) is filled with a high-strength and high-ductility material; vertically placing the upper shear wall (2) on the tops of the two precast floor slabs (3), and sequentially connecting the second steel plate (23), the precast floor slabs (3), the third steel plate (32) and the first steel plate (13) in a penetrating manner by adopting second bolts (6); after the bolt connection is finished, the bolt installation groove (24) is sealed by ductile concrete or epoxy resin mortar, and the node assembly is finished.

10. The construction method of a precast floor slab-precast shear wall connection node according to claim 9, wherein the shear key installation groove (34) of the precast floor slab (3) is spliced with the horizontal shear key (14) of the first steel plate (13) while horizontally placing two precast floor slabs (3) on the top of the lower shear wall (1).

Technical Field

The invention belongs to the field of civil and architectural engineering and assembled structures, and relates to a prefabricated floor slab-prefabricated shear wall connecting node and a construction method thereof.

Background

The connection node of the prefabricated member and the construction method are key problems of an assembled concrete structure, and particularly the connection node of the prefabricated plate and the prefabricated shear wall has great influence on low-carbon green assembly and the integral stress performance of the structure.

The existing precast slabs or laminated slabs adopt post-cast concrete to anchor the overhanging reinforcing steel bars of the floor slab, so as to realize continuous force transmission of the reinforcing steel bars, and have the defects that the concrete needs to be completely cured and reach the designed strength, and the concrete generally needs 28d to reach the designed strength. When the precast slabs are connected with the precast shear wall, the shear wall steel bars are connected through the mechanical connecting piece or the grouting sleeve connecting piece, the closed ring beam is required to be arranged at the joint of the precast slabs and the shear wall, the field wet operation is more, the process is complex, the labor cost is higher, the construction progress is seriously influenced, the laying length of the floor slabs on the precast shear wall is shorter, the joint work of secondary pouring concrete and original member concrete is difficult to guarantee, the collapse resistance under severe earthquake is not clear, and the characteristics of assembly type, rapidness and high efficiency are not favorably exerted.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a prefabricated floor slab-prefabricated shear wall connecting node and a construction method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a prefabricated floor slab-prefabricated shear wall connecting node comprises a lower shear wall, a prefabricated floor slab, 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 mounting grooves close to two sides of the lower end surface;

the number of the prefabricated floor slabs is two, the two prefabricated floor slabs are horizontally arranged, the end parts of the two prefabricated floor slabs are located between the lower shear wall and the upper shear wall, the end parts of the two prefabricated floor slabs are connected through connecting pieces, a third steel plate is arranged on the lower side of each prefabricated floor slab, and the third steel plate horizontally extends out of one connected end of each prefabricated floor slab;

connecting the first steel plate and the third steel plate in a penetrating manner by adopting a first bolt; and sequentially connecting the second steel plate, the prefabricated floor slab and the first steel plate through a second bolt.

Preferably, a horizontal shear key is arranged above the first steel plate of the lower shear wall; and a shear key mounting groove is formed in the bottom of the third steel plate at a corresponding position.

Preferably, the precast floor slab adopts a hollow slab or a composite slab.

Preferably, the bolt installation groove is filled with ductile concrete or epoxy mortar.

Preferably, vertical first stress reinforcing steel bars and vertical second stress reinforcing steel bars are arranged in the lower shear wall and the upper shear wall respectively, and the first stress reinforcing steel bars and the second stress reinforcing steel bars are connected with the first steel plate and the second steel plate respectively.

Furthermore, the top of the lower shear wall and the bottom of the upper shear wall are respectively provided with a first web member reinforcing steel bar and a second web member reinforcing steel bar, the first web member reinforcing steel bar is connected with a first stressed reinforcing steel bar and a first steel plate, and the second web member reinforcing steel bar is connected with a second stressed reinforcing steel bar and a second steel plate.

Preferably, the two prefabricated floor slabs are connected with the end anchors through the connecting pieces.

Preferably, the upper side and the lower side of the precast floor slab are horizontally provided with third stressed steel bars, and the third stressed steel bars positioned below are welded with the third steel plates.

A construction method for the precast floor slab-precast shear wall connection node based on any one of the above comprises the following steps:

the lower shear wall is vertically fixed to a set position, the two prefabricated floor slabs are horizontally placed at the top of the lower shear wall, and the two prefabricated floor slabs are temporarily fixed through bolts; connecting the first steel plate and the third steel plate in a penetrating manner by adopting a first bolt; the end parts of the two precast floor slabs are connected by adopting a connecting piece, the temporarily fixed bolt is taken out, and the gap at the end part connected with the precast floor slabs is filled with a high-strength and high-ductility material; vertically placing the upper shear wall on the tops of the two prefabricated floor slabs, and sequentially connecting the second steel plate, the prefabricated floor slabs, the third steel plate and the first steel plate in a penetrating manner by adopting second bolts; and after the bolt connection is finished, sealing the bolt mounting groove by using ductile concrete or epoxy resin mortar to finish the node assembly.

Preferably, when the two precast floor slabs are horizontally placed at the top of the lower shear wall, the shear key installation grooves of the precast floor slabs are spliced with the horizontal shear keys on the first steel plate.

Compared with the prior art, the invention has the following beneficial effects:

the lower shear wall, the prefabricated floor slab and the upper shear wall are connected into a whole through the steel plate combined bolts, the steel plates reliably transmit the tension of steel bars in the plates, the shear walls resist the tension through the bolts, the concrete bears the pressure, the steel plate combined bolts and the bolts bear the horizontal shear together, the material performance advantages are fully exerted, a common working mechanism is formed, the bending moment of a node is resisted, the integrity of the node is improved, and the bolt tensioning is equivalent to applying prestress and improving the early rigidity of the node. The field does not have welding operation or wet operation, and the connection can be completed only by screwing the bolt, so that the technical requirement is reduced, the labor cost is reduced, and the assembly efficiency and the connection quality are greatly improved.

Furthermore, the shear key mounting 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 horizontal shear force, so that the problem of sliding and falling off under heavy shock is avoided, and the structural integrity and safety are ensured.

Further, although the upper shear wall is provided with the bolt mounting grooves to weaken the concrete section, the horizontal projection area and the vertical projection area are reinforced by the second web member reinforcing steel bars, and the yield strength of the reinforcing steel bars is far higher than that of the concrete, so that the weakening caused by the bolt mounting grooves is sufficiently compensated.

Furthermore, the two prefabricated floor slabs are connected with each other by anchoring the end parts through the connecting pieces, so that the field operation is simple, the anchoring effect is good, and both tension and compression can be transmitted; the concrete does not bear tensile force directly, and the concrete is prevented from cracking under tension.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged side view of the connection node of the present invention.

Wherein: 1-lower shear wall; 11-a first stressed steel bar; 12-first web member rebar; 13-a first steel plate; 14-horizontal shear key; 2-upper shear wall; 21-a second stressed steel bar; 22-second web member rebar; 23-a second steel plate; 24-bolt mounting slots; 3, prefabricating a floor slab; 31-a third stressed steel bar; 32-a third steel plate; 33-floor slab through holes; 34-a shear key mounting groove; 4-a first bolt; 5-a connector; 6-second bolt.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1, the prefabricated floor slab-prefabricated shear wall connection node according to the present invention includes a lower shear wall 1, a prefabricated floor slab 3, and an upper shear wall 2.

The lower shear wall 1 is vertically arranged, the upper end surface of the lower shear wall 1 is provided with a first steel plate 13, and two sides above the first steel plate 13 of the lower shear wall 1 are respectively provided with a horizontal shear key 14; a plurality of first bolt hole holes for the first bolts 4 to pass through are formed in the first steel plate 13 close to the center, a plurality of second bolt hole holes for the second bolts 6 to pass through are formed in the first steel plate 13 close to the two sides, and the plurality of bolt hole holes are arranged in two rows as shown in fig. 2; be provided with a plurality of vertical first atress reinforcing bars 11 in the lower shear wall 1, first atress reinforcing bar 11 is connected with first steel sheet 13, and 1 top in the lower shear wall is provided with a plurality of first web member reinforcing bars 12, and first atress reinforcing bar 11 and first steel sheet 13 are connected to first web member reinforcing bar 12, and the three is the triangle-shaped structure.

The upper shear wall 2 is vertically arranged, a second steel plate 23 is arranged on the lower end face of the upper shear wall 2, a plurality of bolt installation grooves 24 are respectively formed in the two sides, close to the lower end face, of the upper shear wall 2, the bolt installation grooves 24 are vertically arranged in parallel on each side of the upper shear wall 2, and first bolt round holes are formed in the bolt installation grooves 24 of the second steel plate 23; as shown in fig. 2, a plurality of vertical second stressed steel bars 21 are arranged in the upper shear wall 2, and the second stressed steel bars 21 are connected with a second steel plate 23; the bottom of the upper shear wall 2 is provided with a plurality of second web member reinforcing steel bars 22, the second web member reinforcing steel bars 22 are connected with second stress reinforcing steel bars 21 and second steel plates 23, and the three are triangular structures.

The prefabricated floor slab 3 is hollow slab or composite slab, the number of the prefabricated floor slab 3 is two, the two prefabricated floor slabs 3 are horizontally arranged, the end parts of the two prefabricated floor slabs 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 steel bars 31 are horizontally arranged on the upper side and the lower side of the prefabricated floor slab 3, the third stress steel bars 31 located below the prefabricated floor slab are welded with the third steel plate 32, and the third stress steel bars 31, the third steel plate 32 and the third stress steel bars 31 horizontally extend out of the connected end of the prefabricated floor slab 3.

A horizontal shear key 14 is arranged above the first steel plate 13 of the lower shear wall 1; the shear key mounting groove 34 is formed in the bottom of the third steel plate 32 at the corresponding position, and the horizontal shear key 14 and the shear key mounting groove 34 are matched to effectively resist horizontal shear force, so that the problem of sliding and falling off under the condition of a large earthquake is avoided, and the structural integrity and safety are ensured.

The end parts of the two precast floor slabs 3 are anchored and connected through the connecting piece 5, the length of the third stressed steel bar 31 at the top of each precast floor slab 3, extending out of the precast floor slab 3, is not less than the anchoring length of the connecting piece 5, and the connecting piece 5 is connected with the third stressed steel bar 31 at the top of each precast floor slab 3 and is screwed and fixed through bolts.

The third steel plate 32 of the prefabricated floor slab 3 is provided with a plurality of second bolt round holes for the first bolts 4 to pass through, the second bolt round holes correspond to the first bolt thread holes, the prefabricated floor slab 3 is provided with a plurality of floor slab through holes 33 for the second bolts 6 to pass through, and the floor slab through holes 33, the second bolt thread holes and the first bolt round holes correspond to each other in position.

The first bolt 4 penetrates through the first steel plate 13 and the third steel plate 32 through the second bolt round hole and the first bolt threaded hole; the second bolt 6 sequentially connects the second steel plate 23, the prefabricated floor slab 3 and the first steel plate 13 through the first bolt round hole, the floor slab through hole 33 and the second bolt threaded hole.

The inner diameter of the floor slab through hole 33 is more than 5mm larger than the diameter of the bolt, so that hole connection is convenient, and high-strength materials can be filled in the hole after the bolt penetrates through the hole.

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

Prefabricating a lower shear wall 1: the method comprises the steps of pre-burying a first steel plate 13 provided with a first bolt threaded hole at the top end of a lower shear wall 1, welding a first stressed steel bar 11 and a first web member steel bar 12 to the pre-buried first steel plate 13, binding the steel bars, pouring concrete and curing to the age.

Prefabricating an upper shear wall 2: and a second steel plate 23 with a first bolt circular hole is pre-embedded at the bottom end of the upper shear wall 2, a second stress steel bar 21 and a second web member steel bar 22 are welded to the pre-embedded second steel plate 23, and the steel bars are bound and concrete is poured for curing to the age.

And (3) prefabricating a floor slab: arranging upper and lower layers of third stressed steel bars 31 of the prefabricated floor slab 3, welding the third stressed steel bars 31 at the lower part of the prefabricated floor slab 3 on a third steel plate 32, forming a second bolt circular hole on the third steel plate 32, reserving a vertical floor slab through hole 33 at the end part of the prefabricated floor slab 3, wherein the position of the floor slab through hole 33 corresponds to the positions of the second bolt threaded hole and the first bolt circular hole, and adopting local reinforcement measures on the wall of the floor slab through hole 33; a shear key installation groove 34 is reserved at the bottom of the third steel plate 32; the length of the third stressed steel bars 31 extending out of the prefabricated floor slab 3 at the top of the prefabricated floor slab 3 is not less than the anchoring length of the connecting piece 5, and the prefabricated floor slab is formed by formwork erection, steel bar binding and concrete pouring maintenance.

The process of carrying out on-site assembly and connection on the prefabricated floor slab-prefabricated shear wall connection node comprises the following steps:

the lower shear wall 1 is hoisted to a design position, the two precast floor slabs 3 are hoisted to a design height after temporary fixation, the horizontal shear keys 14 are aligned to the grooves, second bolt round holes of a third steel plate 32 at the bottom of each precast floor slab 3 are aligned to first bolt threaded holes of the lower shear wall 1, and the floor slab through holes 33 and the second bolt threaded holes are temporarily fixed through bolts.

And (3) penetrating the first bolt 4 through a second bolt round hole of a third steel plate 32 at the bottom of the precast floor slab 3, screwing the first bolt round hole into a first bolt screw hole of a first steel plate 13 pre-embedded at the top of the lower shear wall 1, and screwing the first bolt 4 after the situation that no error exists is confirmed.

Connecting the third stressed steel bars 31 on the tops of the two precast floor slabs 3 by using the connecting piece 5, screwing and fixing, and taking out the floor slab through holes 33 of the precast floor slabs 3 to temporarily fix bolts; and filling the gap between the connecting end surfaces of the two precast floor slabs 3 with a high-strength and high-ductility material.

The upper shear wall 2 is lifted to a designed position, hole positions of a first bolt round hole of a second steel plate 23 at the bottom of the upper shear wall 2, a floor slab through hole 33 and a second bolt threaded hole of a first steel plate 13 of the lower shear wall 1 are adjusted and aligned, after the error is confirmed, a second bolt 6 sequentially penetrates through the first bolt round hole of the second steel plate 23 at the bottom of the upper shear wall 2, the floor slab through hole 33 and the second bolt threaded hole of the first steel plate 13 of the lower shear wall 1 from a bolt mounting groove 24 at the bottom of the upper shear wall 2, the vertical deviation of the shear wall is adjusted, and all the second bolts 6 are screwed down after the error is confirmed.

After the bolt connection is completed, the bolt mounting groove 24 is sealed by ductile concrete or epoxy resin mortar to prevent loosening and corrosion, and the node assembly is completed.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.