A prefabricated panel-column structure system and its construction method

Abstract

A prefabricated slab-column structure system and its construction method relate to the field of construction. A prefabricated slab-column structure system includes precast concrete columns and precast concrete floor slabs. The precast concrete floor slabs include precast concrete composite slabs. The precast concrete composite slabs include precast bottom slabs and precast concrete ribs. The precast concrete ribs are connected above the precast bottom slabs through truss steel bars. The precast concrete floor slabs also include a cast-in-place concrete layer. The first steel bar group is buried in the precast bottom slab. Notches are opened around the precast bottom slab. The steel bar ends of the first steel bar group are bent upward after extending out from the notches. The second steel bar group is buried in the cast-in-place concrete layer. The steel bar ends of the first steel bar group extending outside the precast bottom slab are connected to the second steel bar group. The third steel bar group is buried in the precast concrete column. The second steel bar group is connected to the third steel bar group. In the present invention, no steel bars extend out around the precast bottom slab, and the on-site installation is extremely convenient.

Description

Technical Field

[0001] The present invention relates to the field of construction, and more particularly to precast concrete structures. Background Art

[0002] Precast concrete structures have the advantages of short construction period and little pollution at the construction site, and have been widely applied to various buildings in recent years.

[0003] Precast concrete structures generally include precast concrete columns, precast concrete composite beams, and precast concrete composite slabs. Conventional precast columns, precast composite beams, and precast composite slabs all have "bearded" steel bars. At the construction site, the connection nodes between beams and columns, beams and beams, and slabs and beams are complex, and it is difficult to ensure the construction quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a precast prefabricated slab-column structure system to solve at least one of the above technical problems.

[0005] The purpose of the present invention is also to provide a construction method for a precast prefabricated slab-column structure system to solve at least one of the above technical problems.

[0006] The technical problems solved by the present invention can be achieved by the following technical solutions:

[0007] A precast prefabricated slab-column structure system includes precast concrete columns and precast concrete floors erected on the precast concrete columns. The precast concrete floors include precast concrete composite slabs. The precast concrete composite slabs include precast bottom plates and precast concrete ribs. The precast concrete ribs are connected above the precast bottom plates through truss steel bars. The precast concrete floors also include a cast-in-place concrete layer cast on the precast bottom plates. It is characterized in that a first steel bar group is embedded in the precast bottom plates, notches are formed around the precast bottom plates, and the ends of the steel bars of the first steel bar group are bent upward after extending out from the notches.

[0008] A second steel bar group is embedded in the cast-in-place concrete layer, and the ends of the steel bars of the first steel bar group extending outside the precast bottom plates are connected to the second steel bar group.

[0009] A third steel bar group is embedded in the precast concrete columns, and the second steel bar group is connected to the third steel bar group.

[0010] Preferably, each precast concrete floor includes at least two precast concrete composite slabs. The notches of two adjacent precast concrete composite slabs on the left and right are abutted against each other, so as to form an upward-opening notch groove at the junction. A ring-shaped connecting steel bar is seated in the notch groove. The bottom of the connecting steel bar abuts against the bottom of the notch groove, and the top of the connecting steel bar is connected to the second steel bar group.

[0011] Preferably, the precast concrete column includes a precast concrete column, which is square columnar, and at least one rectangular through-hole penetrating up and down is formed on each of the four sides of the precast concrete column. The cross-section of the rectangular through-hole is rectangular, and the long side of the rectangular through-hole is parallel to the side of the precast concrete column it is close to; the third steel bar group includes longitudinal steel bars extending in the vertical direction, and the longitudinal steel bars are inserted into the rectangular through-holes.

[0012] The longitudinal steel bars in the precast concrete column located above are connected to the longitudinal steel bars in the precast concrete column located below, and the bottom of the longitudinal steel bars in the precast concrete column located at the bottom is connected to the reserved inserted steel bars on the foundation.

[0013] A construction method of a precast prefabricated slab-column structure system is characterized by comprising the following steps:

[0014] Step 1, prefabricate a precast concrete composite slab in a prefabrication factory. The precast concrete composite slab includes a precast bottom slab and precast concrete ribs. The precast concrete ribs are connected above the precast bottom slab through truss steel bars. A first steel bar group is embedded in the precast bottom slab, and notches are formed around the precast bottom slab. The ends of the steel bars of the first steel bar group are bent upward after extending out from the notches.

[0015] Step 2, install the precast concrete column to the designated position.

[0016] Step 3, transport the precast concrete composite slab to the construction site, and then hoist it to the designated position. Then, connect the second steel bar group to the third steel bar group of the precast concrete column, and connect the ends of the first steel bar group to the second steel bar group.

[0017] Step 4, cast fine aggregate concrete on the precast bottom slab until the top surface of the fine aggregate concrete is not lower than the top surface of the precast concrete ribs, and wait for the fine aggregate concrete to dry to form a cast-in-place concrete layer.

[0018] Beneficial effects: The steel bars do not protrude from the four sides of the precast bottom slab of the present invention, which improves the production and construction efficiency and saves molds; at the same time, the on-site installation is extremely convenient. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a precast concrete composite slab;

[0020] Figure 2 It is a schematic structural diagram of a precast concrete column;

[0021] Figure 3 It is a sectional view of a precast concrete floor slab;

[0022] Figure 4Schematic diagram of the connection between precast concrete floor slab and precast concrete column. Specific implementation mode

[0023] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0024] Refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A precast prefabricated slab-column structure system includes precast concrete columns and precast concrete floor slabs, and the precast concrete floor slabs are erected on the precast concrete columns.

[0025] Regarding the precast concrete floor slab

[0026] The precast concrete floor slab includes a precast concrete composite slab and a cast-in-place concrete layer 9.

[0027] The precast concrete composite slab includes a precast bottom slab 1 and precast concrete ribs 2. The precast concrete ribs 2 are connected above the precast bottom slab 1 through truss steel bars. A first steel bar group is embedded in the precast bottom slab 1, and notches are opened around the precast bottom slab 1. The steel bar ends 3 of the first steel bar group are bent upward after extending out from the notches. A second steel bar group is embedded in the cast-in-place concrete layer 9, and the steel bar ends extending outside the precast bottom slab 1 of the first steel bar group are connected to the second steel bar group. On the one hand, the precast bottom slab 1 does not have steel bars protruding, which is convenient for transportation and installation. On the other hand, the thickness of the cast-in-place concrete layer 9 around the precast bottom slab 1 can be increased.

[0028] The precast bottom slab 1 can be provided with strip-shaped grooves at positions opposite to the precast concrete ribs 2. The notch of the strip-shaped groove faces upward and the groove bottom is parallel to the precast concrete ribs 2. On the one hand, the distance between the precast concrete ribs 2 and the precast bottom slab 1 is increased, which is convenient for laying pipelines at this place. On the other hand, the thickness of the cast-in-place concrete layer 9 at this place can be increased. Pipelines can be buried in the strip-shaped grooves.

[0029] The precast concrete floor slab may further include connecting steel bars 12 in a ring shape. Preferably, each precast concrete floor slab includes at least two precast concrete composite slabs. The notches of two adjacent precast concrete composite slabs on the left and right abut against each other, so as to form an upward-opening groove at the junction. The connecting steel bars 12 are seated in the groove. The bottom of the connecting steel bars 12 abuts against the bottom of the groove, and the top of the connecting steel bars 12 is connected to the second steel bar group. The connecting steel bars 12 include bottom steel bars at the bottom, top steel bars at the top, and side steel bars on the side. The bottom steel bars abut against the bottom of the notch, and at least the end portions of the first steel bar group extending outside the precast bottom slab 1 are welded to connect the bottom steel bars. Thus, the adjacent precast concrete composite slabs are connected together by the connecting steel bars 12. The height of the connecting steel bars 12 is less than the length of the end portions of the first steel bar group extending outside the precast bottom slab 1, and the end portions of the first steel bar group extending outside the precast bottom slab 1 are welded to connect the bottom steel bars and the top steel bars. Preferably, the distance from the top steel bars to the bottom steel bars is equal to the distance from the bottom surface of the precast concrete rib 2 to the bottom of the notch.

[0030] Concrete rib steel bar groups are embedded in the precast concrete ribs 2, and the ends of the steel bars in the concrete rib steel bar groups do not extend outside the precast concrete ribs 2. The concrete rib steel bar groups preferably include strip-shaped steel bars. Further preferably, there are two strip-shaped steel bars embedded in the same precast concrete rib 2. The cross-section of the precast concrete rib 2 is preferably square-shaped. The extending directions of the two strip-shaped steel bars are the same as the extending direction of the precast concrete rib 2, and are respectively close to both sides of the precast concrete rib 2. Thus, the support strength is ensured. The width of the precast concrete rib 2 is less than the length of the top steel bars, and both ends of the top steel bars protrude outside the precast concrete rib 2. The bottom end of the side steel bars may be provided with upward hooks. Thus, the first steel bar group is temporarily hooked by the hooks, and further the welding is facilitated.

[0031] The truss steel bars are preferably stirrup steel bars 4. The stirrup steel bars 4 include top steel bars extending horizontally at the top. Each end of the top steel bars is connected with a side steel bar extending downward. The distance between the two side steel bars gradually increases from top to bottom. The top steel bars are connected to the concrete rib steel bar groups, and the bottoms of the side steel bars are connected to the first steel bar group. Preferably, the top steel bars are located above the strip-shaped steel bars and are welded at the positions where they intersect with the strip-shaped steel bars.

[0032] Preferably, the thickness of the precast bottom plate 1 is 55 mm ± 2 mm, the depth of the strip-shaped groove is 25 mm ± 2 mm, the width of the precast concrete rib 2 is 100 mm ± 2 mm, the thickness of the precast concrete rib 2 is 30 mm, and the distance from the top surface of the precast concrete rib 2 to the bottom surface of the precast bottom plate 1 is 120 mm ± 2 mm. The first steel bar group includes a first stress-bearing steel bar parallel to the precast concrete rib 2 and a second stress-bearing steel bar perpendicular to the first stress-bearing steel bar. Preferably, the intersection of the first stress-bearing steel bar and the second stress-bearing steel bar is connected by welding. The second steel bar group includes a third stress-bearing steel bar 10 parallel to the precast concrete rib 2 and a fourth stress-bearing steel bar 11 perpendicular to the third stress-bearing steel bar. Preferably, the height of the third stress-bearing steel bar 10 is not higher than the top surface height of the precast concrete rib 2 and not lower than the bottom surface height of the precast concrete rib 2. The fourth stress-bearing steel bar 11 is not higher than the bottom surface height of the precast concrete rib 2. Further preferably, the precast concrete rib 2 is seated on the fourth stress-bearing steel bar 11.

[0033] Regarding precast concrete columns

[0034] A third steel bar group is embedded in the precast concrete column, and the second steel bar group is connected to the third steel bar group.

[0035] The precast concrete column includes a precast concrete column. The precast concrete column is square-columnar, and at least one rectangular through-hole penetrating up and down is formed in each of the four side portions of the precast concrete column. The cross-section of the rectangular through-hole is rectangular, and the long side of the rectangular through-hole is parallel to the side of the precast concrete column it is close to. The third steel bar group includes longitudinal steel bars 6 connected to the reserved inserted steel bars at the bottom and reaching the foundation, and the longitudinal steel bars 6 are inserted into the rectangular through-holes.

[0036] The third steel bar group further includes framework steel bars. The framework steel bars are located in the horizontal direction. The framework steel bars include frame steel bars 7 in the shape of a square frame and support steel bars 5 in the shape of a "well" character. The ends of the support steel bars 5 are connected to the frame steel bars 7. The support steel bars 5 divide the space inside the frame steel bars 7 into nine sub-spaces. A vertically penetrating rectangular through-hole is formed in each of the four sub-spaces at the edges of the frame steel bars 7, and a vertically penetrating right-angle through-hole is formed in each of the four sub-spaces at the corners of the frame steel bars 7. The cross-section of the rectangular through-hole is rectangular, and the long side of the rectangular through-hole is parallel to the side of the precast concrete column it is close to; the rectangular through-hole is located inside the frame steel bars 7. At least one vertically extending longitudinal steel bar 6 is inserted into each of the rectangular through-holes, preferably three. The three longitudinal steel bars 6 are arranged at equal intervals along the length direction of the rectangular through-hole. The cross-section of the right-angle through-hole is right-angled. The opening of the right-angle through-hole faces the center of the precast concrete column, and the right-angle through-hole is located inside the frame steel bars 7. At least one vertically extending longitudinal steel bar 6 is inserted into the right-angle through-hole. Preferably, there are five longitudinal steel bars 6 in the same right-angle through-hole, one of which is located at the corner of the right-angle through-hole, two of which are respectively located at the ends of the two sides of the right-angle through-hole, and the remaining two are respectively located in the middle of the two sides of the right-angle through-hole. Preferably, the widths of the rectangular through-hole and the right-angle through-hole are not less than 2.5 times the diameter of the longitudinal steel bar 6. Square grooves are recessed inwardly at the center of the top and the center of the bottom of the precast concrete column, and the square grooves are used as concrete shear grooves. The frame steel bars 7 and the support steel bars 5 are preferably connected by tying steel bars.

[0037] Communication holes 8 are preferably formed in the side walls of the rectangular through-holes and the right-angle through-holes. After passing through the communication holes 8, the first steel bar group is connected to the longitudinal steel bars 6 or the framework steel bars. The connecting steel bars 12 located outside the precast concrete floor slab also pass through the connecting holes and are connected to the longitudinal steel bars 6 or the framework steel bars. Thereby increasing the connection strength. The communication holes 8 are filled with fine aggregate concrete. It is not necessary to form communication holes 8 in every rectangular through-hole and right-angle through-hole, but only the rectangular through-holes and right-angle through-holes facing the second steel bar group. Depressions can be formed inwardly on the side walls of the communication holes, so as to further facilitate the connection operation by using the depressions and increase the contact area between the fine aggregate concrete and the concrete grouting material, thereby improving the connection strength between the precast concrete column and the precast concrete floor slab. The depressions can be precast on the precast concrete column. It is also possible to sleeved a diversion cover that diverts inward to the precast concrete column on the longitudinal steel bars 6 exposed at the connection holes, so as to change the flow direction of the concrete grouting material, and thus form the depressions during the grouting process.

[0038] A construction method for a precast prefabricated slab-column structure system includes the following steps:

[0039] Step 1: Prefabricate precast concrete composite slabs in a prefabrication factory. The precast concrete composite slabs include a precast bottom slab 1 and precast concrete ribs 2. The precast concrete ribs 2 are connected above the precast bottom slab 1 through truss steel bars. A first steel bar group is embedded in the precast bottom slab 1. Notches are formed around the precast bottom slab 1, and the ends of the steel bars in the first steel bar group are bent upward after extending out from the notches.

[0040] Step 2: Install the precast concrete columns to the designated positions.

[0041] Step 3: Transport the precast concrete composite slabs to the construction site, and then hoist them to the designated positions. Then, connect the second steel bar group to the third steel bar group of the precast concrete columns, and connect the ends of the first steel bar group to the second steel bar group.

[0042] Step 4: Cast fine aggregate concrete on the precast bottom slab 1 until the top surface of the fine aggregate concrete is not lower than the top surface of the precast concrete ribs 2. After the fine aggregate concrete dries out, a cast-in-place concrete layer 9 is formed.

[0043] In Step 2, it is necessary to first prefabricate precast concrete columns in a prefabrication factory, and then transport the precast concrete columns to the construction site. Then, make the precast concrete columns in a square column shape, and at least one rectangular through hole penetrating up and down is formed on each of the four side parts of the precast concrete column. The cross-section of the rectangular through hole is rectangular, and the long side of the rectangular through hole is parallel to the side of the precast concrete column it is close to. Then, connect the bottom of the longitudinal steel bars 6 to the reserved inserted steel bars on the foundation. Then, hoist the precast concrete column above the longitudinal steel bars 6. After aligning the longitudinal steel bars 6 with the rectangular through holes, lower the precast concrete column. Then, pour concrete grout into the rectangular through holes. Option 1: It can be poured to the communication port first, and then continue to pour after the second steel bars and the connecting steel bars 12 are connected in place. In this option, the communication port is filled with concrete grout. Option 2: It can be poured to the communication port first, and then continue to pour after the second steel bars and the connecting steel bars 12 are connected in place and the communication port is filled. The filling of the communication port can be realized when the fine aggregate concrete flows to the communication port during the cast-in-place concrete pouring. In this option, the communication port is filled with fine aggregate concrete. The concrete grout can be the same material as the fine aggregate concrete. But preferably they are different, that is, the fluidity of the concrete grout is higher than that of the fine aggregate concrete.

[0044] In Step 3, preferably, first connect the third stress-bearing steel bars of the second steel bar group to the third steel bar group, then suspend the precast concrete composite slab below the third stress-bearing steel bar group by using the connecting steel bars 12, then pass the fourth stress-bearing steel bars through between the precast base plate 1 and the precast concrete rib 2, and then connect them to the third steel bar group, and then connect the positions where the connecting steel bars 12 and the fourth stress-bearing steel bars are staggered together. The connections here are preferably welding. It is also possible to first connect the third stress-bearing steel bars of the second steel bar group to the third steel bar group, then pass the fourth stress-bearing steel bars through between the precast base plate 1 and the precast concrete rib 2, and connect the positions where the connecting steel bars 12 and the fourth stress-bearing steel bars are staggered together, and then lift the precast concrete composite slab together with the fourth stress-bearing steel bars and the connecting steel bars 12 thereon to the designated position, and then connect the connecting steel bars 12 to the third steel bar group and the third stress-bearing steel bars, and connect the fourth stress-bearing steel bars to the third steel bar group.

[0045] For multi-story buildings, Step 2 and Step 3 can be cycled until the required floor height is reached, and finally Step 4 is carried out. It is also possible to cycle Step 2, Step 3, and Step 4. Regardless of which of these two methods is used, the longitudinal steel bars 6 in the precast concrete columns located in the upper layer are connected to the longitudinal steel bars 6 in the precast concrete columns located in the lower layer, and the longitudinal steel bars in the precast concrete column located at the bottom are connected to the reserved inserted steel bars on the foundation.

[0046] The ends of the longitudinal steel bars 6 can be provided with forks, so that the ends of the longitudinal steel bars 6 are in a "Y" shape. The ends of two adjacent longitudinal steel bars 6 up and down are first inserted and then welded. This structure can play a role of temporary support during the connection of the longitudinal steel bars and reduce the welding difficulty. During the grouting process, while pouring the concrete grouting material into the rectangular through hole or the right-angle through hole, cast-in-place fine aggregate concrete can be carried out on the precast base plate, so as to use the ends in the "Y" shape to impact the grouting material and the mortar, so that the grouting material and the mortar have more combined angles and higher connection strength. During the later use process, it plays a role of releasing torque.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A prefabricated slab-column structure system, comprising precast concrete columns and precast concrete floor slabs erected on the precast concrete columns. The precast concrete floor slabs include precast concrete composite slabs, and the precast concrete composite slabs include precast bottom slabs and precast concrete ribs. The precast concrete ribs are connected above the precast bottom slabs through truss steel bars. The precast concrete floor slabs further include a cast-in-place concrete layer cast on the precast bottom slabs, and it is characterized in that, The first steel bar group is embedded in the precast bottom slab, notches are formed around the precast bottom slab, and the ends of the steel bars of the first steel bar group are bent upward after extending out from the notches; The second steel bar group is embedded in the cast-in-place concrete layer, and the ends of the steel bars of the first steel bar group extending outside the precast bottom slab are connected to the second steel bar group; The third steel bar group is embedded in the precast concrete column, and the second steel bar group is connected to the third steel bar group; Any one of the precast concrete floor slabs includes at least two precast concrete composite slabs. The notches of two adjacent precast concrete composite slabs on the left and right are abutted together, so as to form an upward-opening open groove at the joint. An annular connecting steel bar is seated in the open groove. The bottom of the connecting steel bar abuts against the bottom of the open groove, and the top of the connecting steel bar is connected to the second steel bar group; The precast bottom slab is provided with a strip-shaped groove at a position opposite to the precast concrete rib. The notch of the strip-shaped groove faces upward and the bottom of the groove is parallel to the precast concrete rib; The truss steel bar is a stirrup steel bar. The stirrup steel bar includes a top steel bar extending horizontally at the top. Each end of the top steel bar is connected with a side steel bar extending downward. The distance between the two side steel bars gradually increases from top to bottom. The top steel bar is connected to the concrete rib steel bar group. The bottom of the side steel bar is connected to the first steel bar group. The top steel bar is located above the strip-shaped steel bar and is welded at a position staggered with the strip-shaped steel bar. The bottom end of the side steel bar is provided with an upward hook.

2. The precast and assembled slab-column structure system according to claim 1, wherein The first steel bar group includes first stress steel bars parallel to the precast concrete rib and second stress steel bars perpendicular to the first stress steel bars. The intersection of the first stress steel bars and the second stress steel bars is welded; The second steel bar group includes third stress steel bars parallel to the precast concrete rib and fourth stress steel bars perpendicular to the third stress steel bars. The height of the third stress steel bars is not higher than the top surface height of the precast concrete rib and not lower than the bottom surface height of the precast concrete rib; the fourth stress steel bars are not higher than the bottom surface height of the precast concrete rib, and the precast concrete rib is seated on the fourth stress steel bars.

3. The prefabricated slab-column structure system according to claim 1, characterized in that, The connecting steel bar includes a bottom steel bar at the bottom, a top steel bar at the top, and a side steel bar at the side. The bottom steel bar abuts against the bottom of the notch. The height of the connecting steel bar is less than the length of the end of the first steel bar group extending outside the precast bottom slab. The end of the first steel bar group extending outside the precast bottom slab is welded to the bottom steel bar and the top steel bar.

4. A prefabricated plate-column structure system according to claim 1, characterized in that The precast concrete column includes a precast concrete column. The precast concrete column is in a square column shape. At least one rectangular through hole penetrating up and down is formed at each of the four side portions of the precast concrete column. The cross section of the rectangular through hole is in a rectangular shape, and the long side of the rectangular through hole is parallel to the side of the precast concrete column close to it; the third steel bar group includes longitudinal steel bars extending in the vertical direction, and the longitudinal steel bars are inserted into the rectangular through holes.

5. A prefabricated slab-column structure system according to claim 4, characterized in that, A communication hole is formed on the side wall of the rectangular through hole. The first steel bar group passes through the communication hole and is connected to the longitudinal steel bar. The end of the longitudinal steel bar is provided with a fork.

6. The construction method of the prefabricated slab-column structure system according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1, precast precast concrete composite slabs in a prefabrication factory; Step 2, install the precast concrete column to the designated position; Step 3: Transport the precast concrete composite slab to the construction site. After hoisting it to the designated position, connect the second steel bar group to the third steel bar group of the precast concrete column, and connect the end of the first steel bar group to the second steel bar group. Step 4: Cast fine aggregate concrete on the precast floor slab until the top surface of the fine aggregate concrete is not lower than the top surface of the precast concrete rib. After the fine aggregate concrete dries out, a cast-in-place concrete layer is formed.

7. The construction method of a prefabricated slab-column structure system according to claim 6, characterized in that, In Step 2, first precast the precast concrete column in the precast factory, and then transport the precast concrete column to the construction site. Then, at least one rectangular through-hole penetrating up and down is opened on each of the four sides of the precast concrete column. Then, connect the bottom of the longitudinal steel bar to the reserved inserted steel bar on the foundation. Then, hoist the precast concrete column above the longitudinal steel bar. After aligning the longitudinal steel bar with the rectangular through-hole, lower the precast concrete column. Then, pour concrete grout into the rectangular through-hole. When pouring, first pour to the communication port. After the second steel bar and the connecting steel bar are connected in place, then cast fine aggregate concrete on the precast floor slab until the fine aggregate concrete fills the communication port, and then continue to pour.

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