CN217711170U - A kind of precast concrete slab splicing joint based on tenon and tenon joint - Google Patents

Abstract

The utility model belongs to the technical field of the prefabricated building, a precast concrete slab splicing node based on mortise-tenon joint is disclosed, which comprises precast concrete slabs spliced in the same plane, wherein the splicing side plate end of each precast concrete slab is provided with a plate end tenon and a plate end mortise which are opposite in position, the splicing side plate end of each precast concrete slab is provided with in-plate longitudinally distributed reinforcing steel bars, and in-plate transversely distributed reinforcing steel bars extend outwards at the plate end mortise and are arranged into U-shaped end hoops; every two crisscross a plurality of hoops that form of U type end hoop are provided with node vertical distribution muscle in a plurality of hoops, and the precast concrete board who has arranged node vertical distribution muscle passes through post-cast concrete fixed connection. The utility model discloses compare the ordinary prefabricated plate of reserving long straight section reinforcing bar, it is more convenient, safe in transportation, hoist and mount process, not only construct convenient and fast more, the node is new, old concrete interlock ability is stronger, is showing anti crack resistance, the anti shearing bearing capacity of level and the component wholeness that has improved the node.

Description

A splicing joint of precast concrete slabs based on mortise and tenon joints

technical field

The utility model belongs to the technical field of prefabricated buildings, and in particular relates to a prefabricated concrete panel splicing node based on mortise and tenon joints.

Background technique

The prefabricated concrete building adopts factory prefabricated concrete components, and is designed and constructed through mechanized hoisting and reliable connection on site. Prefabricated concrete buildings have the advantages of standardized design, industrialized production, and prefabricated construction. They have less wet work on site and a short construction period. At the same time, they can improve the construction environment, reduce pollution, and have good sustainable development. The node connection of precast concrete components is a weak link in the construction of prefabricated buildings, which will directly affect the integrity and safety of the structure. By improving the node connection structure and structural form, the purpose of improving the structural bearing capacity and seismic performance can be achieved. In addition, making prefabricated concrete components easy to construct and transport is also one of the research focuses of prefabricated concrete buildings.

Prefabricated concrete slabs in prefabricated concrete buildings mainly include floor slabs and wall slabs. The connection methods of slabs can be divided into dry connection and wet connection according to the construction process. Dry connection refers to the use of dry joints such as bolts and anchor bolts to connect prefabricated components without pouring in the later stage. The construction method of the wet connection is to reserve the outstretched steel bars at the end of the slab. During construction, the reserved steel bars are connected first, and then concrete or grouting materials are poured at the joints for anchoring. Because the bearing capacity, seismic performance and in-plane stiffness of wet joints are close to those of monolithic concrete members, and the integrity, crack resistance and durability are better, wet joints are more widely used in projects at this stage.

At present, in the existing wet connection construction method of precast concrete slabs, the core part of the joint is to bind steel bars on site and then pour concrete. Lattice steel bars are used to ensure the reliable connection of the structure, which makes the joint form complicated and the construction is cumbersome; the anchored steel bars protruding from the side of the slab need to be grooved in the factory, which reduces the production efficiency; Installation and other links will also cause inconvenience, affecting construction progress and safety; in order to facilitate on-site lapping and anchoring of reserved steel bars, the size and position of the reserved concrete holes must be very accurate, which requires high production accuracy. In addition, in the process of use, it is difficult to ensure the structural integrity of the post-cast concrete at the junction of the joints, and cracks are prone to occur at the junction of the new and old concrete joints when the joints are under load. Therefore, it is an urgent problem to be solved to improve the joint connection technology to ensure the connection effectiveness of precast concrete slabs, ensure the construction quality, and improve the industrialization level of prefabricated buildings.

Utility model content

The utility model aims to solve the technical problems related to the joint connection of precast concrete slabs. On the basis of the wet connection method of precast concrete slab joints, it provides a precast concrete slab splicing joint based on mortise and tenon joints, which can be used for floor or wall panels. Component connection has advantages in production, construction and stress.

In order to solve the above technical problems, the utility model is realized through the following technical solutions:

The utility model provides a splicing joint of prefabricated concrete slabs based on mortise and tenon joints, which includes prefabricated concrete slabs spliced in the same plane, and there is a distance between the prefabricated concrete slabs;

The spliced side plate ends of the precast concrete slabs are provided with evenly distributed and alternately arranged slab end tenons and slab end mortises, the slab end tenons between the precast concrete slabs are opposite to each other and the slab end tenons are located relatively;

The spliced side plate ends of the prefabricated concrete slab retain longitudinally distributed steel bars in the plate, and the longitudinally distributed steel bars are exposed in the tongue and groove of the plate end; the transversely distributed steel bars in the plate of the precast concrete slab are tenoned The grooves extend outward and are set as U-shaped end hoops; the U-shaped end hoops between the precast concrete panels are staggered in pairs to form a plurality of hoops; two node vertical hoops are arranged in the plurality of hoops Distributing reinforcement, two vertical distribution reinforcements of the nodes are respectively arranged close to the intersection of the U-shaped end hoops; the prefabricated concrete slabs arranged with the vertical distribution reinforcements of the nodes are fixedly connected by post-cast concrete.

Further, the height of the board-end tenon and the depth of the board-end tenon groove are not less than 100mm, and the angle between two opposite sides of each board-end tenon and the horizontal plane is not greater than the friction angle.

Further, the U-shaped end hoop includes two straight sections protruding from the precast concrete slab and an arc top integrally connected to the two straight sections.

Furthermore, the arc top of the U-shaped end hoop is at least 250 mm beyond the end face of the tenon of the plate end, and the length of the straight section of the U-shaped end hoop protruding from the end face of the tenon groove of the plate end is not less than 0.6l _ab ; where, l _ab is the basic anchorage length of the tensile reinforcement.

Further, the node vertically distributed reinforcement passes through all the hoops and is parallel to the longitudinally distributed reinforcement in the plate.

The beneficial effects of the utility model are:

The prefabricated concrete slab splicing joint based on the mortise and tenon connection of the utility model is provided with a slab end mortise and a slab end tenon groove on the splicing side of the precast concrete slab, and combined with longitudinal distribution of steel bars in the slab, U-shaped end hoops, and vertical distribution of joints. , Post-cast concrete to form node connections, compared with ordinary prefabricated slabs with long straight steel bars reserved, it is more convenient and safe in the process of transportation and hoisting.

The U-shaped end hoops of adjacent precast concrete slabs are buckled together to form an effective hoop, combined with the vertical distribution of bars at the nodes, not only the construction is more convenient and fast, but also the requirement for the hole accuracy of the precast concrete slabs is lower during production. When pouring joint concrete on site, the slab end tenon and slab end tenon groove of the precast concrete slab can also be used as a formwork to improve construction efficiency.

The prefabricated concrete slab splicing joint based on mortise and tenon connection of the utility model can ensure the reliable transmission of bending moment and shear force in the joint area, not only connects adjacent prefabricated concrete slabs into a unified whole, but also strengthens the relationship between post-cast concrete and precast concrete. The occlusal strength between the old and new concrete effectively improves the mechanical performance of the joint surface of the old and new concrete, ensures the in-plane strength and stiffness of the floor, and significantly improves the crack resistance of the joints, the horizontal shear bearing capacity and the integrity of the components. For precast concrete structures system is important.

Description of drawings

Fig. 1 is the elevation schematic diagram of the splicing node of the prefabricated concrete slab provided by the utility model;

Fig. 2 is the schematic front view of the splicing joint of the prefabricated concrete slab provided by the utility model;

Fig. 3 is the top view schematic diagram of the splicing node of the prefabricated concrete slab provided by the utility model;

Fig. 4 is a schematic diagram of the completion of pouring of the splicing joint of the precast concrete slab provided by the present invention.

In the above figure: 1: prefabricated concrete slab; 2: slab end tenon; 3: slab end tenon and groove; 4: longitudinal distribution of reinforcement in the slab; 5: U-shaped end hoop; 6: vertical distribution of reinforcement at nodes; 7: post-casting concrete.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

As shown in Figures 1 to 3, this embodiment discloses a precast concrete slab splicing joint based on mortise and tenon joints, including precast concrete slabs 1 spliced in the same plane, and there is a gap between the precast concrete slabs 1 . When used as a wall panel, the distance between the precast concrete slabs 1 is not greater than 200mm; when used as a floor slab, the distance between the precast concrete slabs 1 is not greater than the smaller value of the beam width at the joint joint and 300mm.

The spliced side plate ends of the precast concrete slab 1 are provided with a plurality of slab-end tenons 2 and a plurality of slab-end tenon grooves 3, and the slab-end tenons 2 and the slab-end tenon grooves 3 are evenly distributed and arranged alternately. Between the precast concrete slabs 1 , the mortise 2 at the end of the slab is opposite and the mortise 3 at the end of the slab is opposite. The height of the mortise 2 of the plate end and the depth of the mortise 3 of the plate end are not less than 100mm, and the angle between the two opposite sides of the mortise 3 of each plate end and the horizontal plane is not greater than the friction angle to ensure the shear strength of the joint.

The vertically distributed steel bars 4 in each precast concrete slab 1 are left uncut at the ends of the spliced side plates, that is, the longitudinally distributed steel bars 4 run through between multiple plate end tenons 2 and multiple plate end tenon grooves 3 of the precast concrete slab 1 , and exposed in the mortise 3 of the plate end, to ensure the integrity and common stress performance of the cast-in-place part and the prefabricated part at the node connection.

The laterally distributed steel bars in each precast concrete slab 1 extend outward at the mortise 3 at each slab end and are set as U-shaped end hoops 5, and each U-shaped end hoop 5 includes two protruding precast concrete slabs 1 A straight section and an arc top integrally connected to the two straight sections. The arc top of the U-shaped end hoop 5 is at least 250mm beyond the end surface of the tenon 2 of the plate end, and the length of its straight section protruding from the end surface of the tenon groove 3 of the plate end is not less than 0.6l _ab ( _lab is the basic anchorage length of the tensile steel bar). The two U-shaped end hoops 5 arranged in the opposite slab end mortises 3 between the precast concrete slabs 1 are not on the same plane, so that the U-shaped end hoops 5 between the precast concrete slabs 1 are staggered in pairs to form multiple hoops .

Two node vertical distribution bars 6 are arranged in a plurality of hoops formed between two precast concrete slabs 1 , and the nodal vertical distribution bars 6 pass through all hoops and are parallel to the longitudinal distribution reinforcement bars 4 in the slab. The two node vertical distribution ribs 6 are respectively arranged close to the intersection of the U-shaped end hoops 5 .

Between the precast concrete slabs 1 after the nodes are vertically distributed ribs 6 are arranged, post-cast concrete 7 is poured using the slab end tenons 2 and slab end tenon grooves 3 as templates, so that the spliced precast concrete slabs 1 form a unified whole, as shown in the figure 4.

The construction method of the above-mentioned prefabricated concrete slab splicing joint based on the mortise and tenon connection includes the following steps:

(1) Prefabricated concrete slab 1 is prefabricated in a factory according to the aforementioned design structure;

(2) Hoist the precast concrete slab 1 to the installation position, so that the slab end tenon 2 between the precast concrete slabs 1 is opposite to the slab end tenon 2, and the slab end tenon 3 is opposite to the slab end tenon 3;

(3) After the U-shaped end hoops 5 between the precast concrete slabs 1 are staggered in pairs to form a plurality of hoops, the U-shaped end hoops 5 are bound;

(4) Two node vertical distribution bars 6 are bound in multiple hoops formed between precast concrete slabs 1, and the two nodal vertical distribution bars 6 pass through all hoops and are respectively close to the staggered U-shaped end hoops 5 layout;

(5) Using the tenon 2 and tenon groove 3 of the precast concrete slab 1 as a template, the post-cast concrete 7 is poured, so that the two spliced precast concrete slabs 1 are connected to form a unified whole.

Although the preferred embodiment of the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative and not restrictive. Under the enlightenment of the utility model, those of ordinary skill can also make many specific transformations without departing from the spirit of the invention and the protection scope of the claims, and these all belong to the protection scope of the utility model.

Claims (5)

1. A prefabricated concrete slab splicing node based on mortise and tenon connection, characterized in that, comprising prefabricated concrete slabs spliced in the same plane, there is a spacing between the prefabricated concrete slabs; The spliced side plate ends of the precast concrete slabs are provided with evenly distributed and alternately arranged slab end tenons and slab end mortises, the slab end tenons between the precast concrete slabs are opposite to each other and the slab end tenons are located relatively; The spliced side plate ends of the prefabricated concrete slab retain longitudinally distributed steel bars in the plate, and the longitudinally distributed steel bars are exposed in the tongue and groove of the plate end; the transversely distributed steel bars in the plate of the precast concrete slab are tenoned The grooves extend outward and are set as U-shaped end hoops; the U-shaped end hoops between the precast concrete panels are staggered in pairs to form a plurality of hoops; two node vertical hoops are arranged in the plurality of hoops Distributing reinforcement, two vertical distribution reinforcements of the nodes are respectively arranged close to the intersection of the U-shaped end hoops; the prefabricated concrete slabs arranged with the vertical distribution reinforcements of the nodes are fixedly connected by post-cast concrete. 2. A precast concrete slab splicing joint based on mortise and tenon connection according to claim 1, characterized in that the height of the mortise at the slab end and the depth of the mortise at the slab end are not less than 100mm, and each The included angles between the two opposite sides of the tongue and groove of the board end and the horizontal plane are not greater than the friction angle. 3. A precast concrete slab splicing joint based on mortise and tenon joints according to claim 1, wherein the U-shaped end hoop includes two straight sections extending from the precast concrete slab and integrally connected to the The top of the arc of the two straight segments. 4. A prefabricated concrete slab splicing joint based on mortise and tenon joint according to claim 3, characterized in that, the arc top of the U-shaped end hoop exceeds the end surface of the mortise at the plate end by at least 250mm, and the U-shaped The length of the end surface of the straight section of the end hoop protruding from the tongue and groove of the plate end is not less than _0.6lab ; where, _lab is the basic anchorage length of the tensile steel bar. 5. A prefabricated concrete slab splicing node based on mortise and tenon connection according to claim 1, characterized in that, the vertically distributed reinforcement of the node passes through all the hoops and is connected with the vertically distributed reinforcement in the slab parallel.

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