A plate column joint support structure and a construction method thereof

Abstract

The present application relates to a kind of plate column node support structure and its construction method, effectively solve the problem that the seismic resistance, stability and decorative of beamless floor structure are difficult to consider;The technical solution includes elastic support unit and rigid support unit, elastic support unit is located in the center of column top, rigid support unit is enclosed in the periphery of elastic support unit in closed ring, rigid support unit is flush with the outer wall of column cement cylinder, within the normal load range, by elastic support unit, main load bearing effect is played, rigid support unit plays auxiliary load bearing effect, rigid support unit keeps the stability of floor, in the state of supercharge impact, rigid support unit is damaged, the rigid state of floor is released, completely by elastic support unit, impact is effectively buffered, the stability under normal state and the buffering performance under supercharge state are considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of prefabricated buildings, in particular to a slab-column joint support structure and a construction method thereof. BACKGROUND

[0002] A beamless floor refers to a structure in which a beam is not provided between a floor and a support column, and the column directly supports the floor. It is commonly used in exhibition halls, stores, warehouses and other buildings with large floor loads. The beamless floor has the advantages of flat floor bottom, large indoor net height, good lighting and ventilation conditions, and convenient industrialized construction methods. However, it has the disadvantage of poor seismic resistance.

[0003] A buffer support is a column top support with seismic buffering performance, commonly seen between bridge piers and box girders, between steel structure beams and columns, etc. It generally uses multiple horizontal and vertical elastic elements to buffer impact on three coordinate axes. For example, the invention patent with application number CN202110367372.8 buffers impact load in all directions through vertical and horizontal buffer springs. Each elastic element is independent and only buffers displacement in its deformation direction. That is, for a single impact, most elastic elements are in a non-working state except for the elastic element whose deformation direction is consistent with the impact direction. This cannot fully utilize the performance of the elastic element.

[0004] In addition, we hope that under alternating loads within the safe bearing capacity of the structure, the floor can maintain sufficient rigidity and stability to withstand the impact of excessive loads that may damage the building body. However, the current buffer support structure is always in a non-rigid shock-absorbing state. Even under alternating loads within the normal bearing capacity, the floor will still produce corresponding displacement changes.

[0005] Furthermore, exhibition halls, stores and other building bodies with beamless floor structures are different from bridges and steel structure buildings. They have certain decoration requirements. Traditional buffer supports are exposed, there is a gap between the column and the floor, the appearance of the column is not complete, and it conflicts with most decoration styles. If we want to achieve uniform decoration style, we need to decorate all the columns. SUMMARY

[0006] The present application provides a slab-column joint support structure and a construction method thereof to solve the problem of poor seismic resistance, stability and decoration of beamless floor structures.

[0007] The technical scheme is solved by a kind of plate column node support structure, including elastic support unit and rigid support unit, elastic support unit is located at the center of column top, rigid support unit is enclosed in the periphery of elastic support unit in closed ring, elastic support unit includes a circular ring base, the inner circumference of base is evenly distributed with multiple elastic sheets, elastic sheet is arc-shaped and convex to the center of base, between every two adjacent elastic sheets, a connecting block is connected, the both ends of connecting block are provided with slot, the end of elastic sheet is inserted into slot, the outer wall of connecting block is attached to the inner wall of base and can slide along the inner wall of base, connecting block is composed of rigid block at both ends and elastic block clamped between two rigid blocks, a core column is installed in base, the middle section of core column is tapered with upper large and lower small, a transition block is arranged between each elastic sheet and tapered section of core column, the outer side of transition block is attached to elastic sheet, the inner side of transition block is completely attached to the outer wall of tapered section of core column, the bottom of core column is provided with an elastic support seat;

[0008] Rigid support unit includes cast-in-place cement cylinder, the lower end of cement cylinder is against column top, the upper end is against floor slab, cement cylinder is divided into upper cylinder and lower cylinder, the lower end of upper cylinder is sharp taper, the upper end of lower cylinder is conical pit, the lower end of upper cylinder is matched with the upper end of lower cylinder through taper face.

[0009] The top of column is provided with first limiting slot, base is placed in first limiting slot, the upper end of core column is provided with second limiting slot, the lower side of floor slab is provided with limiting block integrally cast and formed, limiting block is positioned in second limiting slot.

[0010] The position where the lower surface of column top and floor slab is connected with cement cylinder is pre-buried with connecting steel bars.

[0011] The outer side of each connecting block and the inner wall of base are provided with tetrafluoroethylene plate.

[0012] A construction method of plate column node support structure, comprising the following steps:

[0013] Step one, install elastic support unit, after assembling elastic support unit, hoist the whole to column top, place base in first limiting slot for positioning;

[0014] Step two, hoist floor slab, hoist floor slab to the upper side of each support column and adjust the orientation of floor slab, so that each limiting block on floor slab is aligned with second limiting slot on elastic support unit of each column top and slowly lowered, until floor slab seat is on each elastic support unit;

[0015] Step three, set formwork and pour lower cylinder of rigid support unit, formwork includes inner formwork and lower outer formwork, lower outer formwork, inner formwork and column top enclose a cavity consistent with lower cylinder, connecting steel bars of column top are located in the cavity, after pressure grouting, wait for concrete to completely solidify, remove lower outer formwork;

[0016] Step four, setting up a template and pouring the upper cylinder of the rigid support unit, the template includes the inner template not removed in step three and an upper outer template, the upper outer template and the inner template, the upper end surface of the lower cylinder and the floor form a cavity consistent with the upper cylinder, the connecting steel bars under the floor are located in the cavity, after pressure grouting, after the concrete is completely solidified, the upper outer template is removed.

[0017] In step three and step four, the inner template, the lower outer template and the upper outer template all adopt a two-half split structure.

[0018] The application can fully exert the performance of the buffer, achieve better buffering effect, take into account the stability under normal state and the buffering performance under overloading state, and achieve better decoration effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a top view of the support structure.

[0020] Figure 2 It is a front view of the support structure.

[0021] Figure 3 It is Figure 1 It is an enlarged view of the A position.

[0022] Figure 4 It is a schematic view of the construction process.

[0023] Figure 5 It is Figure 4 It is an enlarged view of the B position. DETAILED DESCRIPTION

[0024] A kind of plate column node support structure, including elastic support unit and rigid support unit, elastic support unit is located in the center of column top, rigid support unit is enclosed in the periphery of elastic support unit in closed ring, elastic support unit includes a circular base 1, the inner circumference of base 1 is uniformly distributed with multiple elastic sheets 2, elastic sheet 2 is arc-shaped and convex to the center of base 1, elastic sheet 2 in natural state, it has fixed camber, every two adjacent elastic sheet 2 is connected by a connecting block 3, the both ends of connecting block 3 are provided with slot 4, the end of elastic sheet 2 is inserted into slot 4, the outer wall of connecting block 3 is attached with the inner wall of base 1 and can slide along the inner wall of base 1, connecting block 3 is composed of rigid block at both ends and elastic block 6 clamped between two rigid blocks, base 1 is internally provided with a core column 7, the upper end of core column 7 supports floor, the middle section of core column 7 is tapered from big to small, the tapered end of core column 7 corresponds with elastic sheet 2 in vertical direction, and a transition block 8 is arranged between each elastic sheet 2 and the tapered section of core column 7, the outside of transition block 8 is attached with elastic sheet 2, and the inside is the same tapered surface as the outer wall of the tapered section of core column 7, so that the inside of transition block 8 is completely attached with the outer wall of the tapered section of core column 7, the bottom of core column 7 is provided with an elastic support seat 9;When core column 7 horizontally shakes, it will radially extrude one or more elastic sheets 2, the radius of curvature of the extruded elastic sheet 2 increases, i.e. the two ends stretch outward, which will push the connecting block 3 at both ends to slide outward and extrude the end of the remaining elastic sheet 2, so that the radius of curvature of the remaining elastic sheet 2 decreases, i.e. the two ends move towards the middle, so that all elastic sheets 2 are deformed, and the elastic block 6 also deforms slightly, which participates in the buffering of horizontal shaking together, and fully plays the buffering effect of all elastic sheets 2 and elastic blocks 6;When core shaft is subjected to vertical impact, elastic support seat 9 buffers the impact, and at the same time, core column 7 moves downward under the action of tapered surface and pushes transition block 8 outward to extrude all elastic sheets 2, the two ends of all elastic sheets 2 stretch outward, so that the elastic block 6 on connecting block 3 is compressed and deformed, and all elastic sheets 2 and all elastic blocks 6 are deformed to participate in buffering.

[0025] The rigid support unit comprises a cast-in-situ cement cylinder 10, which is wrapped around the elastic support unit, and is cast in-situ after the floor is hoisted into position, and the lower end of the cement cylinder 10 abuts against the column top and the upper end abuts against the floor, and the cement cylinder 10 is divided into an upper cylinder 11 and a lower cylinder 12, the lower end of the upper cylinder 11 is in a pointed cone shape, the upper end of the lower cylinder 12 is in a conical pit shape, the lower end of the upper cylinder 11 cooperates with the upper end of the lower cylinder 12 through a conical surface, the upper cylinder 11 and the lower cylinder 12 are cast in two times, the conical combined surface is a new and old concrete combined surface, and the combined force is less than that of the once-cast concrete; when the floor bears an alternating load within a normal range that does not affect the safety of the structure, the elastic support unit serves as a main bearing part, the rigid support unit serves as an auxiliary bearing part, and the two jointly bear the floor, since the cement cylinder 10 is rigid and cannot be deformed, the floor remains stationary under the alternating load within the safety range, thereby maintaining good stability under the safety load, when the floor is subjected to an excessive load or impact, horizontal impact will directly cause the upper cylinder 11 and the lower cylinder 12 to be misaligned, and then the upper cylinder 11 or the lower cylinder 12 is broken to lose bearing capacity, vertical impact will crush the upper cylinder 11 or expand and break the lower cylinder 12 under the action of the conical surface, and the cement cylinder 10 will also lose bearing capacity, after the cement cylinder 10 loses bearing capacity, the elastic support unit completely bears the floor, and the elastic support unit can effectively buffer the shaking and impact of the floor; after the impact ends, the cement cylinder 10 can be cast again to repair.

[0026] In addition, the outer wall of the cement cylinder 10 and the outer wall of the column body form an integral whole, and after being painted, the column body and the cement cylinder 10 are integrated, the elastic support unit is not exposed, and better decoration effect can be achieved.

[0027] The column top is provided with a first limiting groove 13, and the base 1 is positioned in the first limiting groove 13, the upper end of the core column 7 is provided with a second limiting groove 14, and the lower side of the floor is provided with a limiting block 15 integrally cast and formed, and the limiting block 15 is positioned in the second limiting groove 14.

[0028] The positions, where the column top and the lower surface of the floor are connected with the cement cylinder 10, are pre-buried with connecting steel bars 16.

[0029] The outer side of each connecting block 3 and the inner wall of the base 1 are provided with tetrafluoroethylene plates 17, which have the characteristics of wear resistance and small friction coefficient.

[0030] The construction method of the node support structure comprises the following steps:

[0031] Step one, installing the elastic support unit, after the elastic support unit is assembled, the whole is hoisted to the column top, and the base 1 is positioned in the first limiting groove 13;

[0032] Step two, hoisting the floor slab, hoist the floor slab to the top of each support column and adjust the floor slab position, so that each limit block 15 on the floor slab is aligned with the second limit slot 14 on the elastic support unit at the top of each column and slowly down, until the floor seat is actually on each elastic support unit;

[0033] Step three, set the formwork and pour the lower cylinder 12 of the rigid support unit, the formwork includes inner formwork 18 and lower outer formwork 19, the inner formwork 18 is cylindrical, coaxially installed between the column top and the floor slab, the lower outer formwork 19 is composed of a cylinder and a funnel-shaped top plate, the lower outer formwork 19 is located outside the inner formwork 18, the lower end of the lower outer formwork 19 is fixed on the side wall of the column top by bolts, the lower outer formwork 19, the inner formwork 18 and the column top form a cavity consistent with the lower cylinder 12, the connecting steel bars 16 of the column top are located in the cavity, the lower outer formwork 19 is provided with a grouting hole at the bottom and a discharge hole at the top, pressure grouting is carried out through the grouting hole until the grout overflows from the discharge hole to stop grouting; after the concrete is completely solidified, the lower outer formwork 19 is removed;

[0034] Step four, set the formwork and pour the upper cylinder 11 of the rigid support unit, the formwork includes the inner formwork 18 not removed in step three and an upper outer formwork 20, the upper outer formwork 20 is located outside the inner formwork 18 and the upper end abuts against the floor slab, the lower end of the upper outer formwork 20 is fixed on the side wall of the column top by bolts, the bolts are used through the bolt holes in step three when the lower outer formwork 19 is fixed, the upper outer formwork 20, the inner formwork 18 and the upper end surface of the lower cylinder 12 and the floor slab form a cavity consistent with the upper cylinder 11, the connecting steel bars 16 of the lower side of the floor slab are located in the cavity, the side wall of the upper outer formwork 20 is provided with a grouting hole and a discharge hole, pressure grouting is carried out through the grouting hole until the grout overflows from the discharge hole, after the concrete is completely solidified, the upper outer formwork 20 is removed, and the bolt holes on the side wall of the column top are filled; after the rigid support unit is formed, the inner formwork 18 is retained inside the rigid support unit, the inner formwork 18 is made of wood board, plastic board, PVC board, thin steel plate, etc., and does not have axial bearing capacity after the rigid support unit is damaged.

[0035] In step three and step four, the inner formwork 18, the lower outer formwork 19 and the upper outer formwork 20 all adopt a two-half split structure, so that they can be normally installed.

[0036] After the rigid support unit is damaged due to large overload or impact, the rigid support unit can be re-poured according to step three and step four, and then painted and decorated.

[0037] The elastic support unit of the present application, through the connection arrangement of the elastic sheets 2, all the elastic sheets 2 will deform whether it is horizontal impact or vertical impact, that is, all the buffers will participate in buffering for any direction impact, so that the performance of the buffers can be fully utilized to achieve better buffering effect.

[0038] The present application plays a main bearing role by the elastic support unit and an auxiliary bearing role by the rigid support unit. In a safe alternating load range, the rigid support unit keeps the stability of the floor, and in an overloading impact state, the rigid support unit is destroyed, the rigid state of the floor is released, and the impact is effectively buffered by the elastic support unit, which takes into account the stability in the normal state and the buffering performance in the overloading state.

[0039] Moreover, the outer wall of the rigid support unit is consistent with the outer wall of the column body, and the elastic support unit is not exposed, so that the column body has a complete appearance after painting, which is conducive to the unity of the decoration style and achieves a better decoration effect.

Claims

1. A plate column node support structure, characterized by, The application relates to a plate-column joint support structure, which comprises an elastic support unit and a rigid support unit, the elastic support unit is located at the center of a column top, the rigid support unit is in a closed ring shape and surrounds the elastic support unit peripherally, the elastic support unit comprises a circular ring-shaped base (1), a plurality of elastic sheets (2) are uniformly distributed on the inner periphery of the base (1), the elastic sheets (2) are in an arc shape and the convex surfaces thereof face the center of the base (1), every two adjacent elastic sheets (2) are connected through a connecting block (3), the two ends of the connecting block (3) are provided with insertion grooves (4), the end portions of the elastic sheets (2) are inserted into the insertion grooves (4), the outer wall of the connecting block (3) is attached to the inner wall of the base (1) and can slide along the inner wall of the base (1), the connecting block (3) is composed of rigid blocks at the two ends and elastic blocks (6) clamped between the two rigid blocks, a core column (7) is arranged in the base (1), the middle section of the core column (7) is in a taper shape with the upper part being larger than the lower part, a transition block (8) is arranged between every elastic sheet (2) and the taper section of the core column (7), the outer side of the transition block (8) is attached to the elastic sheet (2), the inner side of the transition block (8) is completely attached to the outer wall of the taper section of the core column (7), and the bottom of the core column (7) is provided with an elastic support base (9). The rigid support unit comprises a cast-in-situ cement cylinder (10), the lower end of the cement cylinder (10) abuts against the column top, the upper end of the cement cylinder (10) abuts against a floor slab, the cement cylinder (10) is divided into an upper cylinder (11) and a lower cylinder (12), the lower end of the upper cylinder (11) is in a sharp taper shape, the upper end of the lower cylinder (12) is in a conical pit shape, and the lower end of the upper cylinder (11) is matched with the upper end of the lower cylinder (12) through a taper surface.

2. The plate column node support structure according to claim 1, wherein The column top is provided with a first limiting groove (13), the base (1) is arranged in the first limiting groove (13), the upper end of the core column (7) is provided with a second limiting groove (14), the lower side of the floor slab is provided with an integrally cast limiting block (15), and the limiting block (15) is positioned in the second limiting groove (14).

3. The plate column node support structure according to claim 1, wherein The positions, where the column top and the lower surface of the floor slab are connected with the cement cylinder (10), are pre-buried with connecting steel bars (16).

4. The plate column node support structure according to claim 1, wherein The outer side of every connecting block (3) and the inner wall of the base (1) are provided with tetrafluoroethylene plates (17).

5. A construction method of a plate column node support structure, characterized by, The plate-column joint support structure is the support structure as claimed in any one of claims 1 to 4, and comprises the following steps: Step one, installing the elastic support unit, after the elastic support unit is assembled, the elastic support unit is hoisted to the column top as a whole, and the base (1) is arranged in the first limiting groove (13) to be positioned; Step two, hoisting the floor slab, the floor slab is hoisted to the right above the support columns and the position of the floor slab is adjusted, the limiting blocks (15) on the floor slab are aligned with the second limiting grooves (14) on the elastic support units of the column tops, and the floor slab is slowly lowered until the floor slab is arranged on the elastic support units; Step three, supporting the formwork and pouring the lower cylinder (12) of the rigid support unit, the formwork comprises an inner formwork (18) and a lower outer formwork (19), the lower outer formwork (19), the inner formwork (18) and the column top surround a cavity which is consistent with the lower cylinder (12), the connecting steel bars (16) of the column top are located in the cavity, after pressure grouting, the lower outer formwork (19) is removed after the concrete is completely solidified; Step four, set up the formwork and pour the upper cylinder (11) of the rigid support unit, the formwork includes the inner formwork (18) not removed in step three and an upper outer formwork (20) in the shape of a cylinder, the upper outer formwork (20) encloses a cavity consistent with the upper cylinder (11) with the inner formwork (18), the upper end surface of the lower cylinder (12) and the floor, the connecting steel bars (16) on the lower side of the floor are located in the cavity, after pressure grouting, after the concrete completely solidifies, the upper outer formwork (20) is removed.

6. The construction method of a plate column node support structure according to claim 5, wherein In step three and step four, the inner formwork (18), the lower outer formwork (19) and the upper outer formwork (20) all adopt a two-half split structure.

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