CN204753957U - Precast concrete board and superstructure are connected to absolutely dry formula - Google Patents

Abstract

The utility model provides a method of absolutely dry formula is connected precast concrete board, superstructure and anti -seismic performance and is promoted. Concrete slab is including prefabricated concrete slab, and top both sides embedded plate push up the built -in fitting, and built -in fitting at the bottom of the board is established to the bottom, and board top built -in fitting includes board top anchor slab, connects exposed board and push up the dowel on the anchor slab of board top, the built -in fitting includes reinforcing bar at the bottom of the horizontal board at the bottom of the board, is connecting pre -buried metal sheet on the reinforcing bar at the bottom of the horizontal board, is equipped with reinforcing bar at the bottom of vertical board between the pre -buried metal sheet, and the metal sheet exposes in the board basal surface of precast concrete board. The superstructure includes and connects the floor that the concatenation of precast concrete board formed by absolutely dry formula, is connected with the roof beam around the floor. The utility model discloses a to the welded connection of built -in fitting at the bottom of the corresponding board in the position in the adjacent absolutely dry formula connection precast concrete board, regulation and control nodal connection's deformability, the deformability of built -in fitting is greater than board top built -in fitting at the bottom of messenger's board.

Description

Fully dry connection of precast concrete slabs and floors

technical field

The utility model relates to the field of prefabricated assembled buildings and construction thereof, in particular to a fully dry connected prefabricated concrete slab and floor.

Background technique

At present, prefabricated floor slabs in the construction field mainly include: prefabricated perforated panels, grooved panels and prefabricated laminated panels, etc. Traditional prefabricated perforated panels and grooved panels have a relatively narrow range of use due to stress and connection. The prefabricated laminated slab floor is the most researched and applied floor form in the past 20 years. Composite floors can be roughly divided into two categories: thin-slab laminated floors and thick-slab laminated floors. Lamination of thin slabs is assembling an integral floor. In this type of floor, the prefabricated slab is a precast concrete thin slab, which is poured into a whole with the concrete above it during construction. The thick slab laminated floor refers to pouring a layer of concrete on top of prefabricated hollow slabs, channel slabs and sandwich slabs. It is difficult to make light-weight treatments such as hollow or interlayer for the laminated thin-slab floor. The floor has a large dead weight, wastes materials, and is not good for the foundation and structure's earthquake resistance. The above two types of prefabricated laminated slab floors belong to the "wet" floor system. Due to the need for post-cast concrete during construction, there are a lot of wet work and on-site work, which requires formwork and support, complex work, long construction period, great influence by seasons and climate, high resource consumption, and great impact on the environment.

Contents of the invention

The utility model aims at the deficiencies of the above-mentioned prior art, and proposes a fully dry-connected prefabricated concrete slab and floor covering with high connection strength between slabs, strong anti-seismic ability, structural integrity and two-way realization.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A full-dry connected precast concrete slab described in the utility model includes precast concrete slabs with tongue-and-groove forms on both sides. The bottom of the slab is provided with a group of slab bottom embedded parts, and slab end connectors are respectively embeded at both ends of the precast concrete slab 1; Anchor bar at the top of the slab, the anchor bar at the top of the slab is pre-embedded in the precast concrete slab, and the anchor slab at the top of the slab is exposed on the tongue-and-groove facade of the precast concrete slab; the embedded parts at the bottom of the slab include The horizontal slab bottom reinforcement on both sides of the slab bottom is connected with a pre-embedded metal plate, and the pre-embedded metal plate on one side of the precast concrete slab bottom is connected to the precast concrete slab bottom on the other side. The buried metal plate is provided with longitudinal slab bottom reinforcement, and one end of the longitudinal slab bottom reinforcement is connected to the pre-embedded metal plate on the bottom side of the precast concrete slab 1, and the other end of the longitudinal slab bottom reinforcement is connected to the precast The pre-embedded metal plate on the other side of the bottom of the concrete slab is connected, and the metal plate is exposed on the bottom surface of the prefabricated concrete slab.

The floor cover constructed by the fully dry-connected precast concrete slabs described in the utility model includes a floor slab formed by splicing the fully dry-connected precast concrete slabs, and beams are connected around the floor slabs, and the beams are respectively connected with the The two ends of the fully dry-connected precast concrete slabs and the outer fully dry-connected precast concrete slabs are connected, and the corresponding slab top embedded parts in the adjacent fully dry-connected precast concrete slabs are connected to each other and the corresponding slab top precast The slab top anchor plate welding connection in the embedded parts, the metal connection plate at the bottom of the slab is provided on the corresponding pre-embedded metal plate in the slab bottom embedded part corresponding to the position in the adjacent fully dry connected precast concrete slab, A through hole is provided in the middle of the bottom metal connection plate, and the bottom metal connection plate is respectively welded and connected to the corresponding pre-embedded metal plate through three-sided surrounding welding.

Compared with the prior art, the utility model has the following characteristics:

1) The new fully dry connected precast concrete sandwich panel of the utility model has a high bearing capacity. The tongue-and-groove connection can transmit the vertical shear force between adjacent slabs, and the slab bottom connector can transmit the bending moment perpendicular to the direction of the slab seam, so as to achieve the effect that the floor load is transmitted from one direction to two orthogonal directions. ; At the same time, the connection between the plate end and the plate side and the beam (wall) can transmit the negative bending moment of the support, and the support form of the plate end and the plate side is transformed from a simply supported support to an elastic support with certain constraints; in the prefabricated sandwich panel The solid part constitutes the hidden rib of the sandwich panel, which has higher lateral stiffness and strength compared with traditional hollow-core panels and sandwich panels. The above-mentioned characteristics of the floor make it have a high vertical bearing capacity.

2) The in-plane mechanical performance of the fully dry-connected precast concrete sandwich panel of the utility model is good. The boards are connected by upper and lower matching metal connectors: the top of the board is connected by a "K"-shaped connector that is convenient to make and uses less steel; the bottom of the board is connected by a pre-embedded metal plate and a metal cover plate with holes , this type of connection has high bending resistance, and through reasonable selection of opening size and weld length, it can have in-plane strength and stiffness similar to that of the "K"-shaped connector on the top of the plate. Under the action of horizontal load, it can be To achieve the effect of cooperating with the "K"-shaped connector on the top of the board, that is, the "K"-shaped connector on the top of the board and the connector at the bottom of the board can provide the maximum resistance at the same time under horizontal load. Adjacent prefabricated slabs near the end of the slab are connected by "π"-shaped connectors with better tensile strength. The modified connectors have better axial force performance and can provide a greater To improve the in-plane bearing capacity and stiffness of the floor. The so-called "K"-shaped connectors on the top of the board are actually embedded parts on the top of the board. The bottom of the glyph is connected to the anchor plate on the top of the board; the so-called "π"-shaped connector is actually a pre-embedded tensile connector, in which the anchor bar and the anchor plate are connected to form a "π" shape. The above-mentioned structural form ensures that the floor has better in-plane mechanical performance under horizontal earthquake action, and provides a better partition function for the entire building structure.

3) The fully dry-connected prefabricated concrete sandwich panel of the utility model has light weight. Suitable for lightweight treatment: replace concrete with lightweight materials at an appropriate position in the center of the thickness of the prefabricated slab; use embedded metal parts at the sides and ends of the prefabricated slab to reliably connect with adjacent components, ensuring sufficient vertical bearing capacity And the mechanical performance in the plane, without the need for post-casting concrete, it can ensure that the floor and the overall building structure have sufficient strength and seismic performance. The material consumption of the floor accounts for about 50% of the total material consumption of the structure. The reduction of the quality of the floor can significantly reduce the self-weight of the structure, thereby reducing the earthquake action and foundation pressure on the structure, and reducing the construction cost.

4) The new fully dry-connected prefabricated concrete sandwich panel of the utility model has a high degree of industrialization (high assembly rate and fast construction speed), easy control of product quality, low labor intensity of workers, good energy saving, material saving and environmental protection effect.

Description of drawings

Fig. 1 is a plan view (plan view) of the top of the fully dry-connected precast concrete sandwich panel of the utility model (top view);

Fig. 2 is a plan view (bottom view) of the bottom of the fully dry-connected prefabricated concrete sandwich panel of the utility model;

Figure 3, Figure 4, Figure 5, and Figure 6 are respectively: B-B section, C-C section, D-D section and light filler section in Figure 1;

Figure 7 and Figure 8 are schematic diagrams of the connection node area on the top of the board and the connection node area on the bottom of the board, respectively;

Figure 9 is a cross-sectional view of the plate seam joint area a-a;

Figure 10 is a detailed diagram of the connection between the bottom metal connection plate and the embedded metal plate. In the figure, Indicates the use of fillet welds on three sides of the construction site (hf indicates the size of the weld foot);

Figure 11 is a schematic diagram of the size of the bottom metal connecting plate, the size of the middle opening and the size of the weld;

Fig. 12, Fig. 13, Fig. 14 and Fig. 15 are respectively: embedded parts at the top of the board side, embedded parts at the bottom of the board side, embedded parts at the end of the board, and tensile embedded parts at the top and bottom of the board side near the end Schematic diagram of the structure.

Detailed ways

Example 1

A fully dry-connected precast concrete slab, comprising a precast concrete slab 1 with tongue-and-groove forms on both sides, a row of precast slab top embedded parts 2 are pre-embedded on both sides of the top of the precast concrete slab 1, and the precast concrete slab 1 The bottom of the slab is provided with a group of slab bottom embedded parts 3, and slab end connectors 5 are respectively embedded at both ends of the precast concrete slab 1; The top anchor bar is connected with the top anchor bar, and the top anchor bar is pre-embedded in the precast concrete slab 1, and the slab top anchor plate is exposed on the side of the precast concrete slab; The longitudinal slab bottom steel bar 36 located on both sides of the bottom of the precast concrete slab 1 is connected with a pre-embedded metal plate on the longitudinal slab bottom steel bar 36, and the pre-embedded metal plate on the bottom side of the precast concrete slab 1 and the precast concrete slab The pre-embedded metal plate on the other side of the bottom of the slab is provided with a transverse slab bottom reinforcement, and one end of the transverse slab bottom reinforcement is connected to the pre-embedded metal plate on the bottom side of the precast concrete slab 1, and the transverse slab The other end of the bottom steel bar is connected to the embedded metal plate located on the other side of the bottom of the precast concrete slab 1, and the bottom surface of the metal plate is exposed on the bottom surface of the precast concrete slab. In this embodiment, tensile connectors 4 are pre-embedded at both ends of the precast concrete slab 1, and the tensile connectors 4 include anchor bars 41, and anchor plates 42 are respectively connected to both ends of the anchor bars 41, and The outer surfaces of the anchor plates 42 at the two ends of the anchor tendons 41 are respectively exposed on the tongue and groove sides of the prefabricated concrete slab. The top anchor bar may be V-shaped, and the bottom of the V shape is connected to the top anchor plate. The plate end connector 5 includes a longitudinal steel bar 51, one end of the longitudinal steel bar 51 is connected with a plate end anchor plate 52 and the upper surface of the plate end anchor plate 52 is exposed on the surface of the precast concrete slab.

Prefabricated concrete slab is a prefabricated concrete sandwich slab. The reinforcement at the bottom of the slab is based on the span and load, and ordinary steel bars or prestressed tendons are selected. The interlayer is made of hydrophobic expanded perlite or other expansive lightweight materials or hollow box materials. The positions of the components and anchor bars are determined to meet the requirements of force and reinforcement anchorage.

Example 2

A floor constructed from the fully dry-connected precast concrete slabs, including a floor slab spliced by fully dry-connected precast concrete slabs, beams are connected around the floor, and the beams are respectively connected to the fully dry-connected precast concrete The two ends of the slab and the outer full-dry connection are connected to the precast concrete slabs, and the corresponding slab top embedded parts 2 in the adjacent fully dry-connected precast concrete slabs are connected to each other and the corresponding slab top embedded parts 2 The top anchor plate is welded and connected, and the corresponding pre-embedded metal plate in the slab bottom embedded part 3 corresponding to the position in the adjacent fully dry-connected precast concrete slab is provided with a slab bottom metal connecting plate 35. The middle part of the bottom metal connection plate 35 is provided with a through hole, and the bottom metal connection plate 35 is respectively welded and connected to the corresponding pre-embedded metal plate through welding on three sides.

Example 3

A method for improving the anti-seismic performance of a floor. First, the floor slab formed by splicing the fully dry-connected precast concrete slabs is connected to the surrounding beams. Secondly, the positions of the adjacent fully dry-connected precast concrete slabs are corresponding The top anchor plate of the slab top embedded part 2 is fully welded and welded, and then the metal plate connected by the node is adjusted by welding the slab bottom embedded part 3 corresponding to the position in the adjacent fully dry-connected precast concrete slab The size of the opening and the length of the weld make the deformation capacity of the embedded part at the bottom of the plate close to that of the embedded part at the top. In this embodiment, the welding connection of the embedded parts 3 at the bottom of the slab adopts the metal connection of the embedded metal plate covering the bottom of the slab among the two embedded parts at the bottom of the slab corresponding to the positions of the adjacent fully dry-connected precast concrete slabs. For the plate, the metal connection plate at the bottom of the plate is connected to the embedded metal plates in the two embedded parts at the bottom of the plate respectively by welding on three sides, and a through hole is opened in the center of the metal connection plate at the bottom of the plate.

Below with reference to accompanying drawing, the embodiment of the utility model is described in more detail:

The utility model fully dry-connected precast concrete sandwich panel is composed of a precast concrete panel 1, a panel top embedded part 2, a panel bottom embedded part 3, a tensile connector 4, and a panel end connector 5. The panel can be filled with light quality filler6.

Figure 7, Figure 8 and Figure 9 respectively show the connection relationship between two adjacent fully dry-connected precast concrete slabs, wherein 101 is one of the two adjacent precast concrete slabs, that is, the first precast concrete slab, and 701 is the corresponding The other of the two adjacent precast concrete slabs is the second precast concrete slab.

Referring to Fig. 7 and Fig. 9, the upper groove 12 of the first precast concrete slab 101 (refer to Fig. 3) and the lower groove 71 of the second precast concrete slab 701 overlap each other, and the first precast concrete slab is pre-embedded The roof embedded part, the first slab roof embedded part includes the first slab roof anchor plate 22, the first V-shaped slab top anchor bar 21 is welded and connected to the first slab roof anchor plate 22, and the second precast concrete slab prefabricated Embed the second top embedded part, the second top embedded part includes the second plate top anchor plate 24, the second V-shaped plate top anchor bar 23 is welded on the second plate top anchor plate 24, and the first plate top anchor plate 24 is welded and connected. A metal strip 25 is arranged between the anchor plate 22 and the anchor plate 24 on the top of the second panel. After the first precast concrete panel 101 and the second precast concrete panel 701 are installed in place, the metal strip 25 is connected to the first panel 22 and the second panel respectively. Two panels 24 are welded and connected;

8 and 9, the upper groove 12 of the first precast concrete slab 101 (refer to FIG. 3 ) and the lower groove 71 of the second precast concrete slab 701 overlap each other, and the first precast concrete slab 101 pre-embeds the first Embedded parts at the bottom of the slab, the second embedded parts at the bottom of the slab are pre-embedded in the second precast concrete slab 701, specifically including the first embedded metal plate 32 connected with the first slab bottom steel bar 31, and the second slab bottom steel bar 33. The second embedded metal plate 34 and the metal connection plate 35 at the bottom of the plate, the metal connection plate 35 at the bottom of the plate is welded and connected with the first embedded metal plate 31 and the second embedded metal plate 33 respectively, and the size of the perforated plate should follow The principle that the rigidity and strength of the upper and lower connectors of the same connection node are similar, such as the third-grade steel bar with a diameter of 10mm for the top connector and the Q235B grade steel plate of -100×50×10 for the anchor plate. Aperture D : opening Plate length L : Open-hole plate width B : Length of the horizontal section of the weld l _w =1:5:1.6:1.5, to ensure that the plate bottom connection node and the plate top connection node at the corresponding position above it can work together under horizontal load , providing maximum strength and stiffness for this node. For other types or sizes of board top connectors, the ratio of the four geometric parameters D, L, B, and _lw of the board bottom connection needs to be re-analyzed and determined.

The calculation method of strength and stiffness of connection joints at the bottom of the slab is as follows:

The two ends of the cover plate are connected to the anchor plate through fillet welds. It is assumed that the welds are equivalent to a fixed boundary, but compared with the test results, this assumption is not true, and the stiffness measured by the test is lower than the stiffness value obtained based on this assumption. Therefore, it is necessary to consider the influence of the weld seam on the stiffness of the cover plate, and then refine the calculation model.

After finite element simulation, the geometric dimensions of the simplified calculation model are as follows:

1) The thickness t and width B of the steel plate are the same as the actual cover plate;

2) A circular hole with a diameter of R is equivalent to a size of R 0.8R rectangular holes.

Simplified dimensions and boundary conditions of the perforated plate. The perforated plate can be equivalent to the series connection of the three rectangular plates shown in the figure, then the total rigidity of the perforated plate is composed of the stiffness of the three rectangular plates.

The stiffness of each part of the perforated plate can be obtained by the following formula, namely

(1)

(2)

The total deformation value of the simplified perforated plate under the in-plane shear force is the sum of the three partial deformations, then

(3)

The formula can be transformed into:

(4)

In the formula, , represent the elastic stiffnesses of the two ends and the middle part of the opening cover plate respectively. It should be noted that, is the elastic stiffness of the middle part of the equivalent opening cover plate, which is determined by the stiffness of the two sub-parts connected in parallel up and down the hole. Therefore, from formulas (1)~(2) we can get

(5)

Therefore, the shear stiffness of the cover-type slab joint joint is:

(6)

There are two levels of in-plane shear strength for open-hole plates, yield strength and ultimate strength. It can be seen from the finite element analysis that the deformation of the perforated plate is mainly bending deformation, and the deformation is mainly concentrated near the round hole. The stress distribution nephogram near the perforated plate is similar to that of the variable cross-section cantilever beam during yielding. Therefore, when calculating the shear yield strength of the perforated plate, the perforated plate can be simplified into a polygon for calculation. In this way, the calculation of the shear strength of the perforated plate is simplified to the calculation of the cantilever beam.

According to the above simplified model, the shear yield strength of the perforated plate can be obtained as:

(7)

In the formula R ——the opening diameter of the cover plate; t - the thickness of the cover plate; f _{the y} - Yield strength of the cover plate.

From this, the shear yield strength of the cover plate joint joint can be obtained as:

(8)

The ultimate load V _su of the perforated plate depends on the strain hardening of the plate and the expansion of plasticity around the hole. It can be seen from the stress cloud diagram of the cover plate joint failure in the aforementioned finite element analysis that under the in-plane shear force, the maximum stress appears near the middle section of the perforated plate, so the calculation of the perforated plate can be based on the following assumptions: Ultimate shear capacity.

(1) According to the mises yield criterion, under certain deformation conditions, when the shear strain energy of the material reaches a certain critical value, the material begins to enter the plastic state. It is assumed that this criterion also applies to the limit state stage of the open-hole plate under shear load, so that the maximum shear stress is .

(2) Assume that the shear stress of the section in the perforated plate is distributed as shown in Fig. 4. This simplified form of shear stress distribution is obtained through numerical analysis and correction based on measured data.

Based on the above considerations, the formula for calculating the ultimate bearing capacity of the perforated plate can be obtained by integrating the shear stress on the section, namely

(9)

In the example diagrams shown in Fig. 1-Fig. 9, the arrangement position of the lightweight filler 6 is determined according to the arrangement form of the anchor tendons 21 of the slab top connector 2 and the anchor tendons 41 of the tensile connector 4 in the prefabricated slab, Ensure sufficient anchorage thickness for the anchor bars and steel bars in the plate, and the lightweight fillers can be lightweight blocks such as hydrophobic expanded perlite or hollow boxes.

In the example diagrams shown in Fig. 1-Fig. 14, the anchor bar 21 in the plate top connector 2 can be set at the position close to the anchor plate 22 with a length greater than 50mm and use methods such as wrapping oil paper to do no gripping force treatment, so that the processed The anchor bar can be freely deformed to improve the deformation capacity of the connector; in the tensile connector 4, the anchor bar 41 can be arranged near the anchor plate 42 with a length greater than 50 mm and wrapped with oil paper to do no gripping force treatment to improve The deformability of the connector.

In the example diagrams given in Fig. 2, Fig. 3, Fig. 8, Fig. 9, Fig. 10 and Fig. 13, the pre-embedded steel plate 32 in the slab bottom connector 3 and two slab bottom steel bars 31 perpendicular to the direction of the slab seam and a The steel bars 36 at the bottom of the slab parallel to the direction of the slab seam are welded and connected.

In the example diagrams given in Fig. 1, Fig. 2, Fig. 4 and Fig. 15, the tensile connector 4 is composed of two anchor tendons 41 and two anchor plates 42, and the anchor plates in the adjacent two prefabricated slabs pass through steel parts welded connection.

In the example diagrams given in Fig. 1, Fig. 2, Fig. 5 and Fig. 14, the plate end connector 5 is composed of two longitudinal steel bars 51 and anchor plates 52 in the plate, the longitudinal steel bars 51 and the anchor plates 52 are welded and connected, and the prefabricated interlayer After the plate is installed in place, it is welded and connected to the embedded parts at the corresponding positions of the supporting member beam or wall.

During specific installation, first hoist in place and fix the beam or wall, then install the support plate, then hoist the supported plate, and then use metal strips, rectangular metal plates and perforated metal plates to weld and connect the embedded parts at the corresponding positions.

Claims (5)

1. A fully dry connected prefabricated concrete slab, comprising precast concrete slabs (1) with tongue-and-groove forms on both sides, characterized in that rows of slab tops are pre-embedded on both sides of the top of the prefabricated concrete slab (1) The embedded parts (2) are provided with a group of embedded parts (3) at the bottom of the precast concrete slab (1), and the slab end connectors (5) are respectively pre-embedded at both ends of the precast concrete slab (1); The slab roof embedded part (2) includes a slab roof anchor plate (22), on which the slab roof anchor bar (21) is connected, and the slab roof anchor bar is pre-embedded in the precast concrete slab (1) Inside, the outer surface of the slab top anchor plate (22) is exposed on the side of the rebate of the precast concrete slab; the slab bottom embedded part (3) includes longitudinal The slab bottom reinforcement (36) is connected with the embedded metal plate on the longitudinal slab bottom reinforcement (36), and the embedded metal plate at the bottom side of the precast concrete slab (1) and the slab bottom at the precast concrete slab (1) The embedded metal plate on the other side is provided with a transverse slab bottom reinforcing bar (31), and one end of the transverse slab bottom reinforcing bar (31) is connected with the embedded metal plate ( 32) connection, the other end of the transverse slab bottom reinforcement is connected to the pre-embedded metal plate (32) on the other side of the precast concrete slab (1) slab bottom, the lower surface of the metal plate is exposed at the slab bottom of the precast concrete slab surface. 2. The full-dry connection precast concrete slab according to claim 1, characterized in that, the two ends of the precast concrete slab (1) are respectively pre-embedded tensile connectors (4), and the tensile connectors (4 ) includes the anchor bar (41), the two ends of the anchor bar (41) are respectively connected with the anchor plate (42), and the outer surfaces of the anchor plate (42) at the two ends of the anchor bar (41) are respectively exposed on the tongue and groove of the prefabricated concrete slab on the side. 3. The fully dry connected precast concrete slab according to claim 1 or 2, characterized in that, the anchor bars (21) of the slab top embedded parts (2) are V-shaped and the V-shaped bottom is connected to the anchor slab . 4. The fully dry connected precast concrete slab according to claim 3, characterized in that, the slab end connector (5) comprises a longitudinal reinforcement (51), and a slab end anchor is connected to one end of the longitudinal reinforcement (51) The plate (52) and the upper surface of the plate end anchor plate (52) are exposed on the surface of the prefabricated concrete slab. 5. A slab constructed of fully dry-connected precast concrete slabs according to any one of claims 1 to 4, characterized in that it comprises a floor slab spliced by fully dry-connected precast concrete slabs. Beams are connected around, and the beams are respectively connected to both ends of the fully dry-connected precast concrete slab and the outer fully dry-connected precast concrete slab, and the corresponding positions in the adjacent fully dry-connected precast concrete slabs are pre-embedded The pieces (2) are connected to each other and the slab top anchor plate in the corresponding slab top embedded part (2) is welded and connected, and the corresponding slab bottom embedded part (3 The corresponding pre-embedded metal plate in ) is provided with the bottom metal connecting plate (35), and the middle part of the bottom metal connecting plate (35) is provided with a through hole, and the bottom metal connecting plate (35) is welded by three sides They are respectively welded and connected with the corresponding embedded metal plates.