Precast concrete wallboard close splicing connection structure

Abstract

The utility model discloses a dense splicing connection structure for precast concrete wallboards, which is formed by combining a left linear precast concrete external wallboard and a right linear precast concrete external wallboard in a dense splicing manner, and each linear precast concrete external wallboard sequentially comprises an external concrete layer, a thermal insulation layer and an internal concrete layer from outside to inside; a plurality of longitudinal holes are evenly distributed in the inner concrete layer in the horizontal direction. Vertical grooves are formed in the left end face and the right end face of the linear prefabricated concrete external wall panel, and a plurality of annular steel bars which are evenly distributed in the longitudinal direction are embedded in the left side and the right side of the inner concrete layer. After the two linear prefabricated concrete external wall panels are spliced, the annular steel bars are arranged in a staggered manner; first vertical steel bars are inserted into all the longitudinal holes, second vertical steel bars are inserted into a cavity defined by the vertical grooves of the two linear prefabricated concrete external wall panels, and the second vertical steel bars penetrate through all the annular steel bars at the splicing position of the two linear prefabricated concrete external wall panels.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated buildings, in particular to a closely assembled connection structure for precast concrete wall panels. Background Art

[0002] Prefabricated buildings have been widely used in the construction industry, greatly improving construction efficiency and reducing labor costs. Prefabricated buildings mainly include precast prefabricated concrete structures, steel structures, modern timber structures, etc. Because they adopt standardized design, factory production, assembly construction, information management, and intelligent application, they are representatives of modern industrial production methods. Among them, precast concrete structures of prefabricated buildings have outstanding advantages in terms of durability, sound insulation, heat preservation, fire protection, etc. A precast concrete wall of a prefabricated building is a concrete structure formed by prefabricating building components in a factory and then assembling, connecting, and partially casting in situ. Due to the fast construction speed of prefabricated buildings and little restriction by climatic conditions, the construction efficiency of buildings is effectively improved.

[0003] At present, the connection structures of precast prefabricated concrete walls mostly adopt the method of partial casting at the wall-column joints or welded connection with embedded steel plates. Most of the connection joints of these methods are flat joints, resulting in poor self-stability at the joints; moreover, most connection methods are relatively complex, and formwork support is required at the connection joints to pour concrete, resulting in the construction at the connection joints becoming a key link restricting the construction speed, and their waterproof and anti-seepage performance is poor.

[0004] Therefore, there is an urgent need in the art to develop a precast concrete wall panel connection structure that can be constructed quickly and does not require formwork support. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a closely assembled connection structure for precast concrete wall panels.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is specifically as follows:

[0007] The first connection method:

[0008] A closely assembled connection structure for precast concrete wall panels is formed by closely assembling two left and right one-piece precast concrete exterior wall panels. The one-piece precast concrete exterior wall panel sequentially includes an outer concrete layer, a thermal insulation layer, and an inner concrete layer from outside to inside; a plurality of longitudinal holes are evenly distributed in the inner concrete layer along the horizontal direction;

[0009] Vertical grooves are provided on both the left and right end faces of the straight-shaped precast concrete exterior wall panel. A plurality of annular steel bars evenly distributed longitudinally are embedded on both the left and right sides of the inner concrete layer; the outer sides of the annular steel bars protrude from the vertical grooves, and the length of the protruding part is greater than the depth of the vertical groove; wherein, the difference between the length of the protruding part and the depth of the vertical groove is less than half of the length of the cross-section of the longitudinal hole.

[0010] All the annular steel bars on the right side face of the straight-shaped precast concrete exterior wall panel on the left are not on the same horizontal plane as all the annular steel bars on the left side face of the straight-shaped precast concrete exterior wall panel on the right, so that the annular steel bars are staggered with each other after the two straight-shaped precast concrete exterior wall panels are spliced.

[0011] A first vertical steel bar is inserted into all the longitudinal holes, and a second vertical steel bar is inserted into the cavity enclosed by the vertical grooves of the two straight-shaped precast concrete exterior wall panels. The second vertical steel bar passes through all the annular steel bars at the splicing position of the two straight-shaped precast concrete exterior wall panels.

[0012] Wherein, steel mesh sheets are provided in both the outer concrete layer and the inner concrete layer; the steel mesh sheets are connected by a plurality of evenly distributed connecting pieces to form a steel reinforcement cage.

[0013] Wherein, the cross-section of the longitudinal hole is oblong, and reinforcing bars are embedded in the concrete layer around the longitudinal hole.

[0014] The second connection method:

[0015] A precast concrete wall panel close-fitting connection structure, characterized in that: it is composed of a straight-shaped precast concrete exterior wall panel and a corner-shaped precast concrete exterior wall panel in close-fitting combination. The horizontal cross-section of the corner-shaped precast concrete exterior wall panel is L-shaped, and the horizontal cross-section of the precast concrete wall panel close-fitting connection structure is L-shaped.

[0016] The straight-shaped precast concrete exterior wall panel and the corner-shaped precast concrete exterior wall panel are successively composed of an outer concrete layer, a thermal insulation layer and an inner concrete layer from outside to inside; a plurality of longitudinal holes are evenly distributed in the inner concrete layer along the horizontal direction; the inner concrete layer of the corner-shaped precast concrete exterior wall panel is provided with corner longitudinal holes at the corner.

[0017] Vertical grooves are provided on both the left and right end faces of the straight-shaped precast concrete exterior wall panel and the corner-shaped precast concrete exterior wall panel. A plurality of annular steel bars evenly distributed longitudinally are embedded on both the left and right sides of the inner concrete layer; the outer sides of the annular steel bars protrude from the vertical grooves, and the length of the protruding part is greater than the depth of the vertical groove; wherein, the difference between the length of the protruding part and the depth of the vertical groove is less than half of the length of the cross-section of the longitudinal hole.

[0018] All the circular steel bars of the straight-line precast concrete exterior wall panels at the joints and all the circular steel bars of the corner-type precast concrete exterior wall panels at the joints are not located at the same horizontal plane, so that the circular steel bars are staggered after the straight-line precast concrete exterior wall panels and the corner-type precast concrete exterior wall panels are spliced;

[0019] First vertical steel bars are inserted into all longitudinal holes, second vertical steel bars are inserted into the cavity enclosed by the vertical grooves of the I-shaped precast concrete exterior wall panel and the corner precast concrete exterior wall panel, and the second vertical steel bars pass through all circular steel bars at the joints of the I-shaped precast concrete exterior wall panel and the corner precast concrete exterior wall panel.

[0020] Wherein, steel meshes are provided in both the outer concrete layer and the inner concrete layer; the steel meshes are connected by a number of evenly distributed connecting pieces to form a steel cage.

[0021] The cross section of the longitudinal hole is an oblong shape, the cross section of the corner longitudinal hole is a circle, and reinforcing ribs are pre-embedded in the concrete layer around the longitudinal holes.

[0022] The third connection method:

[0023] A precast concrete wall panel close-joined connection structure, which is formed by close-joined combination of groove-type precast concrete outer wall panels and precast concrete inner wall panels, wherein the horizontal cross-sections of the groove-type precast concrete outer wall panels and the precast concrete inner wall panels are both in the shape of a straight line, and the horizontal cross-section of the precast concrete wall panel close-joined connection structure is in the shape of a T; the groove-type precast concrete outer wall panels are respectively composed of an outer concrete layer, an insulation layer and an inner concrete layer from the outside to the inside; a longitudinal middle groove is provided in the middle of the inner concrete layer; steel meshes are provided in the outer concrete layer and the inner concrete layer, and the transverse steel bars of the steel meshes in the inner concrete layer pass through the middle groove; a plurality of longitudinal holes are evenly distributed in the inner concrete layer on the left and right sides of the middle groove along the horizontal direction; the steel meshes in the outer concrete layer and the inner concrete layer are connected by a plurality of evenly distributed connectors to form a steel cage;

[0024] The left and right end surfaces of the grooved precast concrete exterior wall panel are both provided with vertical grooves, and the left and right sides of the inner concrete layer are both pre-embedded with a plurality of annular steel bars evenly distributed in the longitudinal direction; the outer sides of the annular steel bars are exposed from the vertical grooves, and the length of the exposed part is greater than the depth of the vertical grooves;

[0025] The precast concrete inner wall panel is precast with concrete and is provided with a steel cage inside. Vertical grooves are provided on the left and right end surfaces of the precast concrete inner wall panel. A plurality of trapezoidal steel bars uniformly distributed along the longitudinal direction are pre-embedded on the left and right sides of the precast concrete inner wall panel. The outer side of the trapezoidal steel bars is exposed from the vertical groove, and the length of the exposed part is greater than the depth of the vertical groove. The precast concrete inner wall panel has a plurality of longitudinal holes uniformly distributed along the horizontal direction.

[0026] All the circular steel bars of the precast concrete interior wall panel and all the transverse steel bars passing through the middle groove of the grooved precast concrete exterior wall panel are not on the same horizontal plane, so that after the grooved precast concrete exterior wall panel and the precast concrete interior wall panel are spliced, the trapezoidal steel bars extend into the middle groove;

[0027] The first vertical steel bars are inserted into all the longitudinal holes, and the second vertical steel bars are inserted into the cavity enclosed by the middle groove of the grooved precast concrete exterior wall panel and the vertical groove of the precast concrete interior wall panel. The second vertical steel bars pass through all the trapezoidal steel bars at the splicing joint of the precast concrete interior wall panel.

[0028] Wherein, the cross-section of the longitudinal hole is oblong, and stiffening bars are embedded in the concrete layer around the longitudinal hole of the grooved precast concrete exterior wall panel.

[0029] The fourth connection method:

[0030] A closely spliced connection structure of precast concrete wall panels is composed of two left and right precast concrete interior wall panels closely spliced together. The horizontal cross-sections of the precast concrete interior wall panels are all in a shape of a straight line; the precast concrete interior wall panels are precast with concrete and are internally provided with steel bar cages. Vertical grooves are formed on the left and right end faces of the precast concrete interior wall panels. A plurality of trapezoidal steel bars are uniformly embedded along the longitudinal direction on the left side and the right side of the precast concrete interior wall panel; the outer sides of the trapezoidal steel bars are exposed from the vertical grooves, and the length of the exposed part is greater than the depth of the vertical grooves; a plurality of longitudinal holes are uniformly distributed along the horizontal direction on the precast concrete interior wall panel; wherein, the difference between the length of the exposed part of the trapezoidal steel bar and the depth of the vertical groove is less than half of the cross-sectional length of the longitudinal hole;

[0031] All the trapezoidal steel bars on the right side face of the precast concrete interior wall panel on the left and all the trapezoidal steel bars on the left side face of the precast concrete interior wall panel on the right are not on the same horizontal plane, so that the trapezoidal steel bars are arranged in a staggered manner after the two precast concrete interior wall panels are spliced;

[0032] The first vertical steel bars are inserted into all the longitudinal holes, and the second vertical steel bars are inserted into the cavity enclosed by the vertical grooves of the two precast concrete interior wall panels. The second vertical steel bars pass through all the trapezoidal steel bars at the splicing joint of the two precast concrete interior wall panels.

[0033] Wherein, the cross-section of the longitudinal hole is oblong.

[0034] Compared with the prior art, the outstanding effect of the present utility model is:

[0035] The closely - joined connection structure of precast concrete wall panels of the present utility model can achieve the rapid construction of the connection structure of precast concrete wall panels. At the connection node between two adjacent wall panels, it is not necessary to support the formwork. Only by docking the two adjacent wall panels can the concrete layers of the two wall panels be completely fitted together. Moreover, through the specially designed circular steel bars or trapezoidal steel bars, the circular steel bars or trapezoidal steel bars of the two wall panels are staggered with each other, which is convenient for inserting vertical steel bars subsequently, ensuring the stability of the connection structure. Subsequently, by pouring concrete into the cavity enclosed by the two wall panels, the overall structure of the wall is finally formed.

[0036] The closely - joined connection structure of precast concrete wall panels of the present utility model has a fast construction speed, high efficiency, and lower construction costs.

[0037] The following further describes the closely - joined connection structure of precast concrete wall panels of the present utility model in conjunction with the attached drawings and specific embodiments. Description of the Drawings

[0038] Figure 1 It is a horizontal sectional view of a straight - shaped precast concrete exterior wall panel;

[0039] Figure 2 It is a horizontal sectional view of a corner - shaped precast concrete exterior wall panel;

[0040] Figure 3 It is a horizontal sectional view of a grooved precast concrete exterior wall panel;

[0041] Figure 4 It is a horizontal sectional view of a precast concrete interior wall panel;

[0042] Figure 5 It is a horizontal sectional view of the closely - joined connection structure of precast concrete wall panels (horizontal connection of exterior wall panels);

[0043] Figure 6 It is a horizontal sectional view of the closely - joined connection structure of precast concrete wall panels (horizontal connection of interior wall panels);

[0044] Figure 7 It is a horizontal sectional view of the closely - joined connection structure of precast concrete wall panels (corner connection of exterior wall panels);

[0045] Figure 8 It is a horizontal sectional view of the closely - joined connection structure of precast concrete wall panels (T - shaped connection between exterior wall panels and interior wall panels).

[0046] Among them, 100 - straight - shaped precast concrete exterior wall panel, 1 - outer concrete layer, 2 - steel mesh, 3 - insulation layer, 4 - inner concrete layer, 5 - longitudinal hole, 6 - circular steel bar, 7 - reinforcing rib, 8 - vertical groove; 9 - first vertical steel bar, 10 - second vertical steel bar; 11 - connecting piece.

[0047] 200 - Corner - type precast concrete exterior wall panel, 21 - Longitudinal holes at the corner;

[0048] 300 - Groove - type precast concrete exterior wall panel, 31 - Middle groove;

[0049] 400 - Precast concrete interior wall panel, 41 - Trapezoidal steel bars. Specific implementation manners

[0050] A precast concrete wall panel close - fitting connection structure can adopt four connection methods.

[0051] Among them, the first connection method is:

[0052] As Figure 1 and Figure 5 shown, it is composed of two left - right linear precast concrete exterior wall panels 100 close - fittingly combined. The linear precast concrete exterior wall panel 100 from outside to inside is successively an outer concrete layer 1, a thermal insulation layer 3, and an inner concrete layer 4; a plurality of longitudinal holes 5 are evenly distributed in the inner concrete layer 4 along the horizontal direction.

[0053] Vertical grooves 8 are opened on both the left and right end faces of the linear precast concrete exterior wall panel 100. A plurality of annular steel bars 6 evenly distributed along the longitudinal direction are pre - embedded on both the left and right sides of the inner concrete layer 4; the outer sides of the annular steel bars 6 are exposed from the vertical grooves 8, and the length of the exposed part is greater than the depth of the vertical groove 8. Among them, the difference between the length of the exposed part and the depth of the vertical groove 8 is less than half of the cross - sectional length of the longitudinal hole 5.

[0054] All the annular steel bars 6 on the right side face of the left linear precast concrete exterior wall panel 100 and all the annular steel bars 6 on the left side face of the right linear precast concrete exterior wall panel 100 are not on the same horizontal plane, so that the annular steel bars 6 are staggered with each other after the two linear precast concrete exterior wall panels 100 are spliced; the through - hole orientation of the annular steel bars 6 is perpendicular to the horizontal plane.

[0055] A first vertical steel bar 9 is inserted into all the longitudinal holes 5, and a second vertical steel bar 10 is inserted into the cavity enclosed by the vertical grooves 8 of the two linear precast concrete exterior wall panels 100. The second vertical steel bar 10 passes through all the annular steel bars 6 at the splicing part of the two linear precast concrete exterior wall panels 100.

[0056] Steel mesh sheets 2 are provided in both the outer concrete layer 1 and the inner concrete layer 4; the steel mesh sheets 2 are connected by a plurality of evenly distributed connectors 11 to form a steel reinforcement cage. The cross - section of the longitudinal hole 5 is oblong, and reinforcing bars 7 are pre - embedded in the concrete layer around the longitudinal hole 5.

[0057] During construction, the first vertical steel bars 9 are all pre-installed, so the first I-shaped precast concrete exterior wall panel 100 is hoisted first. After the first I-shaped precast concrete exterior wall panel 100 falls, the first vertical steel bars 9 pass through the centers of all the longitudinal holes 5 of the first I-shaped precast concrete exterior wall panel 100, and then the second I-shaped precast concrete exterior wall panel 100 is hoisted. When falling, the first vertical steel bars 9 corresponding to the second I-shaped precast concrete exterior wall panel 100 are close to the edges of all the longitudinal holes 5 of the second I-shaped precast concrete exterior wall panel 100. After the second I-shaped precast concrete exterior wall panel 100 falls completely, it moves horizontally toward the joint, so that the annular steel bars 6 are staggered after the two I-shaped precast concrete exterior wall panels 100 are spliced, and then the second vertical steel bars 10 are inserted into the annular steel bars 6. Finally, concrete is poured into the cavity enclosed by all the longitudinal holes 5 and the vertical grooves 8.

[0058] The second connection method is:

[0059] like Figure 1-2 and Figure 7 As shown, it is composed of a straight-line precast concrete exterior wall panel 100 and a corner precast concrete exterior wall panel 200 that are closely assembled. The horizontal cross-section of the corner precast concrete exterior wall panel 200 is L-shaped, and the horizontal cross-section of the precast concrete wall panel close-joined connection structure is L-shaped; the straight-line precast concrete exterior wall panel 100 and the corner precast concrete exterior wall panel 200 are respectively composed of an outer concrete layer 1, an insulation layer 3 and an inner concrete layer 4 from the outside to the inside; a plurality of longitudinal holes 5 are evenly distributed in the horizontal direction in the inner concrete layer 4; the inner concrete layer 4 of the corner precast concrete exterior wall panel 200 is provided with a corner longitudinal hole 21 at the corner.

[0060] The left and right end surfaces of the I-shaped precast concrete exterior wall panel 100 and the corner precast concrete exterior wall panel 200 are both provided with vertical grooves 8, and the left and right sides of the inner concrete layer 4 are both pre-embedded with a plurality of annular steel bars 6 evenly distributed along the longitudinal direction; the outer sides of the annular steel bars 6 are exposed from the vertical grooves 8, and the length of the exposed part is greater than the depth of the vertical grooves 8; wherein, the difference between the length of the exposed part and the depth of the vertical grooves 8 is less than half of the cross-sectional length of the longitudinal hole 5; the through hole of the annular steel bar 6 is perpendicular to the horizontal plane.

[0061] All the circular steel bars 6 of the I-shaped precast concrete exterior wall panel 100 located at the joint and all the circular steel bars 6 of the corner precast concrete exterior wall panel 200 located at the joint are not located on the same horizontal plane, so that the circular steel bars 6 are staggered after the I-shaped precast concrete exterior wall panel 100 and the corner precast concrete exterior wall panel 200 are spliced.

[0062] The first vertical steel bars 9 are inserted into all the longitudinal holes 5, and the second vertical steel bars 10 are inserted into the cavity enclosed by the vertical grooves 8 of the linear precast concrete exterior wall panel 100 and the corner precast concrete exterior wall panel 200. The second vertical steel bars 10 pass through all the circular steel bars 6 at the splicing joint of the linear precast concrete exterior wall panel 100 and the corner precast concrete exterior wall panel 200.

[0063] Steel mesh sheets 2 are provided in both the outer concrete layer 1 and the inner concrete layer 4; the steel mesh sheets 2 are connected by a number of evenly distributed connecting pieces to form a steel reinforcement cage.

[0064] The cross-section of the longitudinal hole 5 is oblong, the cross-section of the corner longitudinal hole 21 is circular, and the reinforcing bars 7 are embedded in the concrete layer around the longitudinal hole 5.

[0065] During construction, the first vertical steel bars 9 are all pre-installed. Therefore, the corner precast concrete exterior wall panel 200 is hoisted first. After the corner precast concrete exterior wall panel 200 falls, the first vertical steel bars 9 pass through the centers of all the longitudinal holes 5 and the corner longitudinal holes 21 of the corner precast concrete exterior wall panel 200. Then the linear precast concrete exterior wall panel 100 is hoisted. When it falls, the first vertical steel bars 9 corresponding to the linear precast concrete exterior wall panel 100 are all close to the edges of all the longitudinal holes 5 of the linear precast concrete exterior wall panel 100. After the linear precast concrete exterior wall panel 100 completely falls, it is horizontally moved towards the splicing joint so that the circular steel bars 6 are staggered with each other after the linear precast concrete exterior wall panel 100 and the corner precast concrete exterior wall panel 200 are spliced. Then the second vertical steel bars 10 are inserted into the circular steel bars 6. Finally, concrete is poured into the cavity enclosed by all the longitudinal holes 5, the corner longitudinal holes 21 and the vertical grooves 8.

[0066] The third connection method is as follows:

[0067] As Figure 3 , Figure 4 and Figure 8 shown, it is composed of the groove-shaped precast concrete exterior wall panel 300 and the precast concrete interior wall panel 400 closely spliced together. The horizontal cross-sections of the groove-shaped precast concrete exterior wall panel 300 and the precast concrete interior wall panel 400 are both linear, and the horizontal cross-section of the precast concrete wall panel closely spliced connection structure is T-shaped; the groove-shaped precast concrete exterior wall panel 300 is composed of an outer concrete layer 1, a thermal insulation layer 3 and an inner concrete layer 4 from outside to inside; a longitudinal middle groove 31 is opened in the middle of the inner concrete layer 4; steel mesh sheets 2 are provided in both the outer concrete layer 1 and the inner concrete layer 4, and the transverse steel bars of the steel mesh sheet 2 in the inner concrete layer 4 pass through the middle groove 31. A number of longitudinal holes 5 are evenly distributed in the inner concrete layer 4 on both sides of the middle groove 31 in the horizontal direction. The steel mesh sheets 2 in the outer concrete layer 1 and the inner concrete layer 4 are connected by a number of evenly distributed connecting pieces to form a steel reinforcement cage;

[0068] Vertical grooves 8 are provided on both the left and right end faces of the grooved precast concrete exterior wall panel 300. A plurality of annular steel bars 6 are embedded on both the left and right sides of the inner concrete layer 4 and are evenly distributed longitudinally. The outer sides of the annular steel bars 6 are exposed from the vertical grooves 8, and the length of the exposed part is greater than the depth of the vertical grooves 8. Among them, the difference between the length of the exposed part of the trapezoidal steel bar 41 and the depth of the vertical groove is less than half of the cross-sectional length of the longitudinal hole.

[0069] The precast concrete interior wall panel 400 is precast from concrete and is provided with a steel reinforcement cage inside. Vertical grooves are provided on both the left and right end faces of the precast concrete interior wall panel 400. A plurality of trapezoidal steel bars 41 are embedded on both the left and right sides of the precast concrete interior wall panel 400 and are evenly distributed longitudinally. The outer sides of the trapezoidal steel bars 41 are exposed from the vertical grooves, and the length of the exposed part is greater than the depth of the vertical grooves. A plurality of longitudinal holes 5 are evenly distributed in the precast concrete interior wall panel 400 in the horizontal direction. The through holes of the trapezoidal steel bars 41 are perpendicular to the horizontal plane.

[0070] All the annular steel bars 6 of the precast concrete interior wall panel 400 and all the transverse steel bars passing through the middle groove 31 in the grooved precast concrete exterior wall panel 300 are not in the same horizontal plane, so that after the grooved precast concrete exterior wall panel 300 and the precast concrete interior wall panel 400 are spliced, the trapezoidal steel bars 41 extend into the middle groove 31.

[0071] A first vertical steel bar 9 is inserted into all the longitudinal holes 5, and a second vertical steel bar 10 is inserted into the cavity enclosed by the middle groove 31 of the grooved precast concrete exterior wall panel 300 and the vertical grooves of the precast concrete interior wall panel 400. The second vertical steel bar 10 passes through all the trapezoidal steel bars 41 at the splicing position of the precast concrete interior wall panel 400.

[0072] The cross-section of the longitudinal hole 5 is oblong, and reinforcing bars 7 are embedded in the concrete layer around the longitudinal hole 5 of the grooved precast concrete exterior wall panel 300.

[0073] During construction, the first vertical steel bars 9 are all pre-installed. Therefore, first hoist the grooved precast concrete exterior wall panel 300. After the grooved precast concrete exterior wall panel 300 drops, the first vertical steel bars 9 pass through the centers of all the longitudinal holes 5 of the grooved precast concrete exterior wall panel 300. Then hoist the precast concrete interior wall panel 400. When it drops, make the first vertical steel bars 9 corresponding to the precast concrete interior wall panel 400 close to the edges of all the longitudinal holes 5 of the precast concrete interior wall panel 400. After the precast concrete interior wall panel 400 completely drops, move it horizontally towards the splicing place so that the trapezoidal steel bars 41 extend into the middle groove 31 after the grooved precast concrete exterior wall panel 300 and the precast concrete interior wall panel 400 are spliced. Then insert the second vertical steel bars 10 into the trapezoidal steel bars 41. Finally, pour concrete into the cavities enclosed by all the longitudinal holes 5, the middle groove 31 of the grooved precast concrete exterior wall panel 300 and the vertical grooves of the precast concrete interior wall panel 400.

[0074] The fourth connection method is as follows:

[0075] As Figure 4 and Figure 6 shown, it is composed of two left and right precast concrete interior wall panels 400 closely spliced together. The precast concrete interior wall panel 400 is precast with concrete and is provided with a steel cage inside. Vertical grooves are opened on the left and right end faces of the precast concrete interior wall panel 400. A plurality of trapezoidal steel bars 41 evenly distributed along the longitudinal direction are embedded on both the left and right sides of the precast concrete interior wall panel 400; the outer sides of the trapezoidal steel bars 41 are exposed from the vertical grooves, and the length of the exposed part is greater than the depth of the vertical grooves; a plurality of longitudinal holes 5 are evenly distributed along the horizontal direction on the precast concrete interior wall panel 400. Among them, the difference between the length of the exposed part of the trapezoidal steel bar 41 and the depth of the vertical groove is less than half of the cross-sectional length of the longitudinal hole.

[0076] All the trapezoidal steel bars 41 on the right side surface of the precast concrete interior wall panel 400 on the left are not on the same horizontal plane as all the trapezoidal steel bars 41 on the left side surface of the precast concrete interior wall panel 400 on the right, so that the trapezoidal steel bars 41 are staggered with each other after the two precast concrete interior wall panels 400 are spliced; the through-hole orientation of the trapezoidal steel bar 41 is perpendicular to the horizontal plane.

[0077] The first vertical steel bars 9 are inserted into all the longitudinal holes 5, and the second vertical steel bars 10 are inserted into the cavity enclosed by the vertical grooves of the two precast concrete interior wall panels 400. The second vertical steel bars 10 pass through all the trapezoidal steel bars 41 at the splicing place of the two precast concrete interior wall panels 400. The cross-section of the longitudinal hole 5 is oblong.

[0078] During construction, the first vertical steel bars 9 are all pre-installed. Therefore, the first precast concrete inner wall panel 400 is hoisted first. After the first precast concrete inner wall panel 400 drops, the first vertical steel bars 9 pass through the centers of all longitudinal holes 5 of the first precast concrete inner wall panel 400. Then, the second precast concrete inner wall panel 400 is hoisted. When it drops, the first vertical steel bars 9 corresponding to the second precast concrete inner wall panel 400 are all close to the edges of all longitudinal holes 5 of the second precast concrete inner wall panel 400. After the second precast concrete inner wall panel 400 completely drops, it is horizontally moved towards the splicing joint so that the trapezoidal steel bars 41 are staggered with each other after the two precast concrete inner wall panels 400 are spliced. Then, the second vertical steel bars 10 are inserted into the trapezoidal steel bars 41. Finally, concrete is poured into the cavity enclosed by all longitudinal holes 5 and vertical grooves.

[0079] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. It should not be understood as a limitation of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A prefabricated concrete wall panel close connection structure, characterized in that: It is composed of two right and left I-shaped precast concrete exterior wall panels (100) which are closely assembled and assembled. The I-shaped precast concrete exterior wall panels (100) are composed of an outer concrete layer (1), a thermal insulation layer (3) and an inner concrete layer (4) from the outside to the inside. The inner concrete layer (4) is evenly distributed with a plurality of longitudinal holes (5) in the horizontal direction. The left and right end surfaces of the I-shaped precast concrete exterior wall panel (100) are both provided with vertical grooves (8); the left and right sides of the inner concrete layer (4) are both pre-buried with a plurality of annular steel bars (6) uniformly distributed in the longitudinal direction; the outer sides of the annular steel bars (6) are exposed from the vertical grooves (8), and the length of the exposed portion is greater than the depth of the vertical grooves (8); wherein the difference between the length of the exposed portion and the depth of the vertical grooves (8) is less than half the length of the cross section of the longitudinal hole (5); All the annular steel bars (6) on the right side of the I-shaped precast concrete exterior wall panel (100) on the left and all the annular steel bars (6) on the left side of the I-shaped precast concrete exterior wall panel (100) on the right are not located on the same horizontal plane, so that the annular steel bars (6) are staggered after the two I-shaped precast concrete exterior wall panels (100) are spliced ​​together; First vertical steel bars (9) are inserted into all the longitudinal holes (5), second vertical steel bars (10) are inserted into the cavity enclosed by the vertical grooves (8) of the two I-shaped precast concrete exterior wall panels (100), and the second vertical steel bars (10) pass through all the annular steel bars (6) at the joint of the two I-shaped precast concrete exterior wall panels (100).

2. The precast concrete wall panel close connection structure according to claim 1 is characterized in that: The outer concrete layer (1) and the inner concrete layer (4) are both provided with steel mesh sheets (2); the steel mesh sheets (2) are connected to each other via a plurality of evenly distributed connecting pieces (11) to form a steel cage.

3. The precast concrete wall panel close connection structure according to claim 2 is characterized in that: The cross section of the longitudinal hole (5) is in the shape of an oblong circle, and reinforcing ribs (7) are pre-embedded in the concrete layer around the longitudinal hole (5).

4. A prefabricated concrete wall panel close connection structure, characterized in that: It is formed by closely splicing a straight-line precast concrete exterior wall panel (100) and an angle-shaped precast concrete exterior wall panel (200), wherein the horizontal cross section of the angle-shaped precast concrete exterior wall panel (200) is L-shaped, and the horizontal cross section of the closely spliced ​​connection structure of the precast concrete wall panels is L-shaped; The straight-line precast concrete exterior wall panel (100) and the corner precast concrete exterior wall panel (200) are composed of an outer concrete layer (1), a thermal insulation layer (3) and an inner concrete layer (4) from the outside to the inside; a plurality of longitudinal holes (5) are evenly distributed in the horizontal direction in the inner concrete layer (4); the inner concrete layer (4) of the corner precast concrete exterior wall panel (200) is provided with a corner longitudinal hole (21) at the corner; The left and right end surfaces of the straight-shaped precast concrete exterior wall panel (100) and the corner-shaped precast concrete exterior wall panel (200) are both provided with vertical grooves (8); the left and right sides of the inner concrete layer (4) are both pre-buried with a plurality of annular steel bars (6) uniformly distributed in the longitudinal direction; the outer sides of the annular steel bars (6) are exposed from the vertical grooves (8), and the length of the exposed portion is greater than the depth of the vertical grooves (8); wherein the difference between the length of the exposed portion and the depth of the vertical grooves (8) is less than half the length of the cross section of the longitudinal hole (5); All the circular steel bars (6) of the straight-line precast concrete exterior wall panel (100) at the joint and all the circular steel bars (6) of the corner-type precast concrete exterior wall panel (200) at the joint are not located on the same horizontal plane, so that the circular steel bars (6) are arranged in an interlaced manner after the straight-line precast concrete exterior wall panel (100) and the corner-type precast concrete exterior wall panel (200) are spliced ​​together; First vertical steel bars (9) are inserted into all the longitudinal holes (5), second vertical steel bars (10) are inserted into the cavity enclosed by the vertical grooves (8) of the straight-line precast concrete exterior wall panel (100) and the corner-type precast concrete exterior wall panel (200), and the second vertical steel bars (10) pass through all the annular steel bars (6) at the joints of the straight-line precast concrete exterior wall panel (100) and the corner-type precast concrete exterior wall panel (200).

5. The precast concrete wall panel close connection structure according to claim 4 is characterized in that: The outer concrete layer (1) and the inner concrete layer (4) are both provided with steel mesh sheets (2); the steel mesh sheets (2) are connected to each other via a plurality of evenly distributed connecting pieces to form a steel cage.

6. The precast concrete wall panel close connection structure according to claim 5 is characterized in that: The cross section of the longitudinal hole (5) is in the shape of an oblong circle, the cross section of the corner longitudinal hole (21) is in the shape of a circle, and reinforcing ribs (7) are pre-embedded in the concrete layer around the longitudinal hole (5).

7. A prefabricated concrete wall panel close connection structure, characterized in that: It is formed by closely splicing a groove-shaped precast concrete exterior wall panel (300) and a precast concrete interior wall panel (400), wherein the horizontal cross-sections of the groove-shaped precast concrete exterior wall panel (300) and the precast concrete interior wall panel (400) are both in a straight line shape, and the horizontal cross-section of the closely spliced ​​connection structure of the precast concrete wall panels is in a T shape; The groove-type precast concrete exterior wall panel (300) comprises, from the outside to the inside, an outer concrete layer (1), a thermal insulation layer (3) and an inner concrete layer (4); a longitudinal middle groove (31) is provided in the middle of the inner concrete layer (4); a steel mesh (2) is provided in both the outer concrete layer (1) and the inner concrete layer (4), and the transverse steel bars of the steel mesh (2) in the inner concrete layer (4) pass through the middle groove (31); a plurality of longitudinal holes (5) are evenly distributed in the horizontal direction in the inner concrete layer (4) on the left and right sides of the middle groove (31); the steel mesh (2) in the outer concrete layer (1) and the inner concrete layer (4) are connected by a plurality of evenly distributed connecting pieces to form a steel cage; The left and right end surfaces of the groove-type precast concrete exterior wall panel (300) are both provided with vertical grooves (8); the left and right sides of the inner concrete layer (4) are both pre-buried with a plurality of annular steel bars (6) evenly distributed in the longitudinal direction; the outer sides of the annular steel bars (6) are exposed from the vertical grooves (8), and the length of the exposed part is greater than the depth of the vertical grooves (8); The precast concrete interior wall panel (400) is precast from concrete and is provided with a steel cage inside. Vertical grooves are provided on both left and right end surfaces of the precast concrete interior wall panel (400). A plurality of trapezoidal steel bars (41) uniformly distributed along the longitudinal direction are pre-embedded on the left and right sides of the precast concrete interior wall panel (400); the outer sides of the trapezoidal steel bars (41) are exposed from the vertical groove, and the length of the exposed part is greater than the depth of the vertical groove; the precast concrete interior wall panel (400) is uniformly distributed with a plurality of longitudinal holes (5) along the horizontal direction; wherein the difference between the length of the exposed part of the trapezoidal steel bars (41) and the depth of the vertical groove is less than half the cross-sectional length of the longitudinal hole; All the annular steel bars (6) of the precast concrete interior wall panel (400) and all the transverse steel bars passing through the middle groove (31) in the groove-type precast concrete exterior wall panel (300) are not located on the same horizontal plane, so that after the groove-type precast concrete exterior wall panel (300) and the precast concrete interior wall panel (400) are spliced, the trapezoidal steel bars (41) extend into the middle groove (31); First vertical steel bars (9) are inserted into all the longitudinal holes (5), second vertical steel bars (10) are inserted into the cavity enclosed by the middle groove (31) of the groove-type precast concrete exterior wall panel (300) and the vertical grooves of the precast concrete interior wall panel (400), and the second vertical steel bars (10) pass through all the trapezoidal steel bars (41) at the joints of the precast concrete interior wall panel (400).

8. The precast concrete wall panel close connection structure according to claim 7 is characterized in that: The cross section of the longitudinal hole (5) is in the shape of an oblong circle, and reinforcing ribs (7) are pre-embedded in the concrete layer around the longitudinal hole (5) of the groove-shaped precast concrete exterior wall panel (300).

9. A prefabricated concrete wall panel close connection structure, characterized in that: The precast concrete inner wall panel (400) is composed of two precast concrete inner wall panels (400) which are closely assembled. The horizontal cross-sections of the precast concrete inner wall panels (400) are all in the shape of a straight line. The precast concrete inner wall panels (400) are precast from concrete and are provided with a steel cage inside. The left and right end surfaces of the precast concrete inner wall panels (400) are provided with vertical grooves. The left and right sides of the precast concrete inner wall panels (400) are pre-embedded with a plurality of trapezoidal steel bars (41) uniformly distributed along the longitudinal direction. The outer sides of the trapezoidal steel bars (41) are exposed from the vertical grooves, and the length of the exposed part is greater than the depth of the vertical grooves. The precast concrete inner wall panel (400) is uniformly provided with a plurality of longitudinal holes (5) along the horizontal direction. The difference between the length of the exposed part of the trapezoidal steel bars (41) and the depth of the vertical groove is less than half the cross-sectional length of the longitudinal hole. All the trapezoidal steel bars (41) on the right side of the precast concrete interior wall panel (400) on the left and all the trapezoidal steel bars (41) on the left side of the precast concrete interior wall panel (400) on the right are not located on the same horizontal plane, so that the trapezoidal steel bars (41) are staggered after the two precast concrete interior wall panels (400) are spliced ​​together; First vertical steel bars (9) are inserted into all the longitudinal holes (5), second vertical steel bars (10) are inserted into the cavity enclosed by the vertical grooves of the two precast concrete interior wall panels (400), and the second vertical steel bars (10) pass through all the trapezoidal steel bars (41) at the joint of the two precast concrete interior wall panels (400).

10. The precast concrete wall panel close connection structure according to claim 9, characterized in that: The cross section of the longitudinal hole (5) is in the shape of an oblong circle.

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