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CN-122013892-A - Box-type connecting system suitable for ceramsite concrete wall-plate-wall nodes

CN122013892ACN 122013892 ACN122013892 ACN 122013892ACN-122013892-A

Abstract

The invention discloses a wall-plate-wall node box type connecting system suitable for a ceramsite concrete close rib plate assembly structure. The system is characterized in that a three-way integrated steel joint core piece is embedded in a floor slab, the vertical steel pipe or steel box body penetrating through the thickness of the floor slab is provided with a long screw rod, and two ends in the horizontal direction extend into upper and lower wall body core areas to form an integrated force transmission unit. The wall sleeve, the floor through holes and the steel node points are arranged according to a uniform modulus, and the node moment arm and the rigidity are cooperatively designed by the section of the steel node point and the thickness of the floor. The steel tie points are preferably disposed at the multi-ribbed plate rib post locations. The invention integrates wall-box type connection, floor slab through holes and upper and lower wall butt joint into the prefabricated steel node system, can obviously simplify the assembly process, define the shear force and tensile pressure transmission path, is convenient for realizing the preset bending shear control and rotation capacity, and improves the assembly integrity and the anti-seismic performance.

Inventors

  • HUANG YUAN
  • HUANG XIANGYU

Assignees

  • 湖南大学

Dates

Publication Date
20260512
Application Date
20260309

Claims (8)

  1. 1. A wall-plate-wall node box type connecting system suitable for a ceramsite concrete close rib plate assembly structure is characterized by comprising a lower wall plate (1) and an upper wall plate (2), wherein a wall box type connecting steel box (11) and a sleeve (10) communicated with the wall box type connecting steel box are respectively embedded in an end core region of the lower wall plate (1) and an end core region of the upper wall plate (2), a ceramsite concrete close rib floor (3) is clamped between the lower wall plate (1) and the upper wall plate (2), the close rib floor (3) comprises a rib column region (4) and a light filling layer region (5), a three-way integrated steel node core member (6) which is arranged in the close rib floor (3) and spans the plate thickness direction, the three-way integrated steel node core member (6) comprises a hollow steel tube or stiffening steel box body (61) which vertically penetrates through the thickness of the floor, upper end and lower ends of the long screw (7) respectively extend out of the upper surface and the lower surface of the floor and extend out of the hollow steel tube or the hollow steel box (61) respectively through nut assemblies (8) and the upper wall plate (2) and the upper wall box type connecting steel box (62) respectively, and the hollow steel box (61) extend into the hollow steel box (1) or the hollow steel box (61) respectively along the direction of the upper wall box (2), the wall body sleeve (10), the hollow steel pipe or stiffening steel box (61) of the floor slab and the plane position of the three-way integrated steel node core piece (6) are arranged according to a uniform modulus to form an integrated prefabricated wall-plate-wall node connecting system, so that shearing force and pulling pressure between an upper wallboard and a lower wallboard and the floor slab are transmitted in a concentrated mode through the three-way integrated steel node core piece (6).
  2. 2. The wall-slab-wall node box connection system according to claim 1, wherein the three-way integral steel node core (6) is arranged in a T-shape or a cross-shape in a plane, wherein when being arranged at the middle inner wall position of a floor slab, a cross-shaped arrangement is adopted, four-direction steel connecting arms (62) of the three-way integral steel node core are respectively connected with wall box connection steel boxes (11) of four adjacent wall boards, and when being arranged near an end wall or an edge beam, a T-shaped arrangement is adopted, and three-way steel connecting arms (62) of the three-way integral steel node core are respectively connected with wall box connection steel boxes (11) of corresponding wall boards or edge members.
  3. 3. The wall-slab-wall node box type connecting system according to claim 1 or 2, wherein the three-way integrated steel node core (6) is preferentially arranged in a rib column region (4) of the ribbed floor slab (3), and the requirements that U-shaped anchor ribs (12) welded or bound with longitudinal stress steel bars of the floor slab are arranged on the periphery of the hollow steel tube or stiffening steel box body (61), part of the ribs are wrapped by the U-shaped anchor ribs (12) and form closed anchor rings with the longitudinal ribs (13) in the ribs are met, and pegs, shear keys or perforations are arranged on the steel connecting arms (62) so as to enhance the mechanical engagement effect with ceramsite concrete and improve the shearing bearing capacity and the anti-sliding performance of the node.
  4. 4. A wall-slab-wall node box connection system according to any one of claims 1 to3, wherein the vertical elevation of the wall sleeve (10) is consistent with the central elevation of the hollow steel pipe or stiffening steel box (61) in the floor slab, and the plane positions of each sleeve (10), hollow steel pipe or stiffening steel box (61) and steel connecting arm (62) are according to the structural modulus Or (b) Standardized arrangements are made so that each wall-panel-wall node in the same floor can be assembled at one time by means of a long screw (7) and bolt assembly of uniform dimensions.
  5. 5. The wall-plate-wall node box type connecting system according to any one of claims 1 to 4, wherein the node bending shear ratio and the rotation capacity are controlled in a coordinated manner by adjusting the ratio of the section height of the hollow steel pipe or stiffening steel box body (61) to the effective height of a floor slab, controlling the node bending transmission arm, and controlling the combination of the node bending stiffness and the slippage stiffness by selecting the stiffness and the pretension of a long screw (7) and a steel connecting arm (62), so that the node working state can be adjusted to a failure mode of shear control, bending control or bending shear cooperative control according to the anti-seismic performance requirement in design.
  6. 6. The wall-plate-wall node box type connecting system according to any one of claims 1-5, wherein floor areas outside a rib column area (4) where the three-way integrated steel node core piece (6) is located are ceramsite concrete or other light filling layers (5), heat preservation materials (14) are arranged to reduce cold bridge effect of the node areas, heat preservation mortar or heat preservation battens are arranged outside the wall box type connecting steel box (11), and the overall thermal performance of the assembled node is guaranteed.
  7. 7. A construction assembly method based on the wall-plate-wall node box type connection system as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps of 1) prefabricating a lower wall plate (1) in a factory, and embedding a wall box type connection steel box (11) and a sleeve (10) connected with the wall box type connection steel box in a core area at the end part of the lower wall plate; 2) prefabricating a ceramsite concrete dense rib floor slab (3) in a factory, pre-burying a three-way integrated steel junction core piece (6) in a rib column region (4), welding or binding and fixing the three-way integrated steel junction core piece with a longitudinal rib (13) and a U-shaped anchor rib (12) in the rib, pre-penetrating a vertical long screw rod (7) into a hollow steel pipe or a stiffening steel box body (61) before pouring the floor slab, 3) prefabricating an upper wallboard (2) in the factory, pre-burying a wall box type connecting steel box (11) and a sleeve (10) which are the same as those in the step 1) in the end core region, 4) hoisting and positioning a lower wallboard (1) on site, hoisting the dense rib floor slab (3) to align the three-way integrated steel junction core piece (6) with the wall box type connecting steel box (11) in the lower wallboard (1), screwing down the lower end of the long screw rod (7) and related bolts, 5) hoisting the upper wallboard (2) again to enable the upper end of the wall box type connecting steel box (11) to be matched with the upper connecting position of the three-way integrated steel junction core piece (6), screwing down the upper end nuts of the long screw rod (7) and the bolts with high strength, and 6) finally grouting or filling fine stone concrete into the gaps around the joints, and carrying out corrosion prevention, heat preservation and facing treatment.
  8. 8. The construction assembly method according to claim 7, wherein in step 4) and step 5), pretension is applied to the long screw (7) and the horizontal high-strength bolt by means of staged tightening and symmetrical tightening, and the pretension is controlled within a design range by means of a torque wrench or a tensioning device, so that consistency of rigidity and deformation coordination of each wall-panel-wall node is ensured.

Description

Box-type connecting system suitable for ceramsite concrete wall-plate-wall nodes Technical Field The invention relates to the technical field of assembled concrete structures, in particular to a wall-plate-wall node box type connecting system suitable for a ceramsite concrete dense rib plate and composite wall plate system and a construction assembly method thereof, and belongs to the improvement technology of building industrialization and prefabricated assembled structure node structures. Background Along with the development of assembled concrete buildings, prefabricated wall board-floor slab-wall board superposition systems are widely applied to residential and public buildings. Node connection is a key link of such systems, and its stress performance directly affects structural integrity and seismic safety. The prior researches aim at the prefabricated wall boards in various forms such as bolt connection, sleeve grouting connection, steel frame-concrete combined joint and the like, and explore the mechanical properties and the joint earthquake resistance of the light or ceramsite concrete wall boards and floor slabs. In the prior engineering practice, ceramsite concrete dense rib plates and light composite wall plates are often in the following wall-plate-wall node forms: 1. Wall-ground beam sleeve + box type connection node The sleeve and box type steel parts are embedded at the end part of the lower wall or the foundation beam, the wallboard is connected with the foundation through vertical steel bars, grouting or short bolts, and the integrity is realized by the multi-reliance floor slab support and cast-in-situ construction ring beam for the upper wall-board-wall connection. 2. Floor through hole long screw rod connection node Through holes are reserved in the prefabricated floor slab ribs or solid areas, long screws penetrating through the upper wall and the lower wall are anchored with wall embedded steel plates or connecting pieces during construction, a vertical tie path is formed, and shearing force is transmitted mainly through friction of a concrete contact surface, shearing force pins or local steel bars. 3. Wall-only wall box type connection node The box type steel parts or steel beams are pre-buried at the end parts of the upper wall plate and the lower wall plate, the floor slab is simply supported on the walls only as vertical bearing members, and the integral constraint between the upper wall and the lower wall is mainly connected with bolts by the insertion of the box type steel parts. The method can meet the basic stress and construction requirements under respective working conditions, but has the following common problems: 1. Node stress paths are scattered, and failure modes are difficult to uniformly design When the combination of wall-ground beam sleeve and box type connection and floor through hole long screw is adopted, the vertical tension is transmitted by the long screw or the vertical steel bar, the shearing force is transmitted by the friction of a concrete pressing area at the end part of the floor, the steel bar in the plane or the wall-plate contact surface, the stress paths in the nodes are mutually staggered and separated, and the bending moment, the shearing force and the axial force are difficult to regulate and control by a unified core component, so that the bending shear ratio and the rotation capacity of the nodes are difficult to be accurately controlled by a designer. 2. The connecting components are relatively independent, the assembly process is dispersed, and the error accumulation is large In the traditional scheme, wall-wall box type connection, floor through holes, upper wall butt joint and lower wall butt joint are often arranged and operated independently in factories and sites respectively, the sites need to be positioned, drilled or aligned for many times, the processes of long screw penetrating, sleeve grouting, high-strength bolt fastening and the like are performed in a crossed manner, the accumulation of installation deviation is easy to cause, and the geometric accuracy and the mechanical property stability of the nodes are affected. 3. Difficulty in considering assembly efficiency, heat preservation performance and node rigidity For ceramsite concrete dense rib plates and composite wall boards, light filling materials are generally adopted in unstressed areas in order to lighten dead weight and improve heat preservation performance. When the node steel parts and the long screw rods are arranged in the light filling layer in a dispersing way, a heat bridge is easy to form, the energy-saving requirement of the building is not facilitated, meanwhile, various connecting parts are arranged in the limited section at the same time, the construction is crowded, the steel bar is connected in a winding way in a complex manner, and the hidden quality trouble is increased. 4. Special comprehensive node for ceramsite concrete dense rib plates The existing