Prefabricated concrete beam-column joint using precast concrete pipe piles and construction method

Abstract

The present invention discloses an assembled concrete beam-column node and construction method using precast concrete pipe piles, the beam-column node comprises an upper precast concrete pipe pile, a lower precast concrete pipe pile and a structural beam, the upper precast concrete pipe pile, the lower precast concrete pipe pile and the structural beam are between the beam-column node area, the steel bars in the pile body of the lower precast concrete pipe pile extend upward to the beam-column node area for anchoring, a number of connecting steel bars pass through the beam-column node area and extend into the pile cores of the upper precast concrete pipe pile and the lower precast concrete pipe pile respectively for anchoring, so that the lower end of the upper precast concrete pipe pile is semi-rigidly connected or hinged to the structural beam, and the upper end of the lower precast concrete pipe pile is rigidly connected to the structural beam. The upper end of the pipe pile of the present invention is rigidly connected to the beam to improve the rigidity, and the lower end is semi-rigidly connected to the beam, which is convenient for adjusting the bending moment of the pipe pile; the present invention can realize mass production and has low cost; the node connection operation is simple, the construction is convenient, safe and reliable, the construction and installation fault tolerance rate is low, the construction progress is accelerated, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of assembled concrete building structure technology, and in particular relates to an assembled concrete beam-column node using precast concrete pipe piles, and also relates to a construction method of the beam-column node. Background Art

[0002] Article 3.0.3 of the "Assembly Evaluation Standard" (GB / T51129-2017) stipulates that the evaluation score of the main structure of an assembled building should be no less than 20 points. In the assembled building scoring table, the main structure has a full score of 50 points, among which the proportion of vertical components such as columns, supports, load-bearing walls, and ductile wall panels reaches 35% to 80%, and the score can be 20 to 30 points. The proportion of components such as beams, plates, stairs, balconies, and air-conditioning panels reaches 70% to 80%, and the score can be 10 to 20 points. If the vertical components are not prefabricated, the proportion of beams, plates, stairs, balconies, air-conditioning panels, etc. must reach 80%, which will bring great difficulties to the disassembly of the components. Therefore, vertical components are often prefabricated.

[0003] At present, among prefabricated vertical components, ordinary reinforced concrete prefabricated columns using sleeve grouting connection method are widely used. However, such ordinary reinforced concrete prefabricated columns have the following disadvantages:

[0004] ⑴ The cost is very high, usually three to four thousand yuan per cubic meter, and due to its large size, higher performance requirements are placed on the crane.

[0005] ⑵ Ordinary reinforced concrete precast columns use the sleeve grouting connection method, which places high demands on the manufacturing and installation accuracy of the precast columns. Ordinary reinforced concrete precast columns have a low fault tolerance rate. If there is an error in any link, the precast column may not be usable and needs to be remade by the precast component factory, which will undoubtedly affect the construction progress and increase the construction cost. Summary of the invention

[0006] The first object of the present invention is to provide an assembled concrete beam-column node using precast concrete pipe piles, which is convenient to construct, safe and reliable, has a low tolerance for construction and installation errors, can speed up construction progress, and reduce construction costs.

[0007] The first object of the present invention is achieved through the following technical scheme: an assembled concrete beam-column node using precast concrete pipe piles, characterized in that it includes an upper precast concrete pipe pile, a lower precast concrete pipe pile and a structural beam, the upper precast concrete pipe pile, the lower precast concrete pipe pile and the structural beam are between the beam-column node area, the steel bars in the pile body of the lower precast concrete pipe pile extend upward to the beam-column node area and are anchored, a plurality of connecting steel bars pass through the beam-column node area and extend into the pile cores of the upper precast concrete pipe pile and the lower precast concrete pipe pile respectively and are anchored, so that the lower end of the upper precast concrete pipe pile is semi-rigidly connected or hinged to the structural beam, and the upper end of the lower precast concrete pipe pile is rigidly connected to the structural beam.

[0008] The present invention uses precast concrete pipe piles to assemble and connect with structural beams to form beam-column nodes. The upper end of the precast concrete pipe pile is rigidly connected to the beam to improve rigidity, and the lower end is semi-rigidly connected to the beam. The existing standard pipe piles themselves have fixed axial force and bending moment bearing capacity. The bending moment of the pipe piles can be adjusted through semi-rigid connection, which is convenient for adjusting the bending moment within the tolerable range of the pipe piles. At this time, the axial force is the only variable, and the standard pipe piles can be selected according to the different axial forces required in different actual projects. Moreover, a section of pipe piles that meets the requirements can be cut from the produced standard pipe piles according to the different lengths required in different actual projects for use in actual projects, without the need to produce precast columns according to the different axial forces, bending moments and lengths required in different actual projects. Therefore, the present invention can achieve mass production and has low cost. The beam-column node connection method of the present invention is simple to operate, convenient to construct, safe and reliable, and has a low fault tolerance rate for construction and installation, which can speed up construction progress and reduce construction costs. In addition, the present invention uses precast concrete pipe piles as precast columns of prefabricated concrete building structures. The production technology of precast concrete pipe piles is mature, the cost is low, and the installation is easy, which is conducive to the development of prefabrication. Moreover, suitable pipe piles can be used according to actual needs, and grouting materials or concrete of any strength can be selected for grouting as needed. Any type of prestressed or non-prestressed steel bars can also be used. Therefore, the present invention has a wide range of applications and is suitable for widespread promotion and use.

[0009] As an improvement of the present invention, the concrete grade of the beam-column node area is the same as the concrete grade of the structural beam, and the cross-section of the beam-column node area is larger than the cross-section of the precast concrete pipe pile.

[0010] In the case where there is a large difference in the concrete strength of the beam and column, if the concrete grade of the beam-column node area is the same as the concrete grade of the structural beam, when the strength of the column is very large, the node is prone to damage. In order to solve this problem, the existing practice is to cast the node and the beam separately using concrete of different grades. However, this practice has the disadvantages of inconvenient construction and low construction efficiency. The beam-column node of the present invention performs appropriate area enlargement according to its different bearing capacity to enhance the bearing capacity of the node and reduce the possibility of node damage. The beam-column node can use concrete of the same strength as the structural beam, so that it can be cast in one go, which is convenient for construction and efficient.

[0011] The difference between the concrete grade of the beam-column node area of ​​the present invention and the concrete grade of the precast concrete pipe pile is greater than 5 MPa.

[0012] When the beam-column node area is small, the steel bars in the lower precast concrete pipe pile body cannot extend into the node area to a sufficient depth. In order to ensure stable anchoring, the steel bars in the lower precast concrete pipe pile body of the present invention that extend into the beam-column node area are bent. When the steel bars are inserted into the node area to a sufficient depth, they may not be bent, that is, the steel bars in the lower precast concrete pipe pile body that extend into the beam-column node area are vertical.

[0013] The cross-sectional shape of the beam-column node area of ​​the present invention is rectangular, rhombus or circular, and other shapes may also be adopted according to actual engineering needs. It is flexible to use and convenient for actual installation and operation.

[0014] The structural beams described in the present invention are prefabricated beams, cast-in-place beams or composite beams.

[0015] According to the present invention, a mortar layer is provided between the upper end of the lower precast concrete pipe pile and the beam-column node area, and between the lower end of the upper precast concrete pipe pile and the beam-column node area.

[0016] Preferably, the precast concrete pipe piles of the present invention are PHC / PC / PRCI / PRCII hollow pipe piles with prestressed or non-prestressed steel bars, and any other strength and model of pipe piles can also be used.

[0017] The second object of the present invention is to provide a construction method for the above-mentioned assembled concrete building beam-column node using precast concrete pipe piles.

[0018] The second object of the present invention is achieved by the following technical solution: a construction method of the above-mentioned assembled concrete building beam-column node using precast concrete pipe piles, characterized in that it specifically includes the following steps:

[0019] S1. Install the casting formwork in the beam-column joint area;

[0020] S2, making the steel bars in the lower precast concrete pipe pile body exposed on its upper end surface;

[0021] S3, hoist the lower precast concrete piles to the installation position, and extend the upper end of the steel bar into the beam-column node area;

[0022] S4. Hoist the upper precast concrete piles to the installation position;

[0023] S5, inserting the connecting steel bars into the upper precast concrete piles and passing through the beam-column node area into the lower precast concrete piles to fix the connecting steel bars;

[0024] S6. Grouting is performed from the upper end of the upper precast concrete pipe pile into the inner part, that is, the pile core of the upper precast concrete pipe pile, the beam-column joint area and the pile core of the lower precast concrete pipe pile are poured at one time.

[0025] The upper end of the lower precast concrete pipe pile of the present invention is connected to the structural beam through the steel bars, connecting steel bars and slurry in the pile body, that is, rigid connection, while the lower end of the upper precast concrete pipe pile is connected to the structural beam through the connecting steel bars and slurry, that is, semi-rigid connection or hinged connection. The precast concrete pipe pile is used as a template for on-site pouring, and the construction is simple and convenient.

[0026] In the present invention, there are gaps between the upper ends of the lower precast concrete pipe piles and the beam-column node area and between the lower ends of the upper precast concrete pipe piles and the beam-column node area. In step S5, during grouting, the gaps are filled to form a grouting layer.

[0027] Compared with the prior art, the present invention has the following significant effects:

[0028] (1) The present invention uses precast concrete pipe piles to assemble and connect with structural beams to form beam-column nodes. The upper end of the precast concrete pipe pile is rigidly connected to the beam to improve rigidity, and the lower end is semi-rigidly connected to the beam. The existing standard pipe piles themselves have fixed axial force and bending moment bearing capacity. The bending moment of the pipe piles can be adjusted through the semi-rigid connection, which is convenient for adjusting the bending moment within the tolerable range of the pipe piles.

[0029] (2) Standard pipe piles can be selected according to different axial forces required in different actual projects, and a section of pipe piles that meets the requirements can be cut from the produced standard pipe piles according to the different lengths required in different actual projects for use in actual projects, without the need to produce prefabricated columns according to the different axial forces, bending moments and lengths required in different actual projects. Therefore, the present invention can achieve mass production and has low cost.

[0030] ⑶ The beam-column node connection method of the present invention is simple to operate, convenient to construct, safe and reliable, has a low tolerance for construction and installation errors, can speed up construction progress, and reduce construction costs.

[0031] (4) The present invention uses precast concrete pipe piles as precast columns of assembled concrete building structures. The production technology of precast concrete pipe piles is mature, the cost is low, and the installation is easy, which is conducive to the development of assembly.

[0032] ⑸ The beam-column node of the present invention is appropriately enlarged in area according to its different bearing capacity to enhance the bearing capacity of the node and reduce the possibility of node damage. The beam-column node can use concrete with the same strength as the structural beam, so it can be poured in one time, which is convenient for construction and high in efficiency.

[0033] (6) The present invention can use pipe piles of other strengths such as PHC / PC with prestressed or non-prestressed steel bars according to actual engineering needs, and can select grouting materials or concrete of any strength for grouting as needed, and can also use any type of prestressed or non-prestressed steel bars. Therefore, the present invention has a wide range of applications and is suitable for widespread promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Figure 1 is a plan view of embodiment 1 of the present invention;

[0036] Figure 2 yes Figure 1 Middle AA section;

[0037] Figure 3 It is a plan view of embodiment 2 of the present invention. DETAILED DESCRIPTION

[0038] Example 1

[0039] like Figure 1 , 2As shown, it is an assembled concrete beam-column node using precast concrete pipe piles of the present invention, including an upper precast concrete pipe pile 1, a lower precast concrete pipe pile 2 and a structural beam 3, and the upper precast concrete pipe pile 1, the lower precast concrete pipe pile 2 and the structural beam 3 are between the beam-column node area 4, and the structural beam 3 is a precast beam, a cast-in-place beam or a composite beam. The upper precast concrete pipe pile 1 and the lower precast concrete pipe pile 2 can be PHC / PC / PRCI / PRCII hollow pipe piles with prestressed or non-prestressed steel bars. The steel bars 5 in the pile body of the lower precast concrete pipe pile 2 extend upward to the beam-column node area 4 for anchoring, and in this embodiment, the part of the steel bar 5 extending into the beam-column node area 4 is bent, so that when the steel bar cannot extend into the node area to a sufficient depth, the anchoring is stable. In other embodiments, when the steel bar is inserted into the node area to a sufficient depth, it may not be bent, that is, the part of the steel bar in the pile body of the lower precast concrete pipe pile extending into the beam-column node area is vertical. A number of connecting steel bars 6 pass through the beam-column node area 4 and extend into the pile cores of the upper precast concrete pipe pile 1 and the lower precast concrete pipe pile 2 for anchoring, respectively, so that the lower end of the upper precast concrete pipe pile 1 is semi-rigidly connected or hinged to the structural beam 3, that is, the lower end of the upper precast concrete pipe pile 1 is connected to the structural beam 3 through the connecting steel bars 6 and the grouting material (or concrete), which is semi-rigidly connected or hinged; the upper end of the lower precast concrete pipe pile 2 is rigidly connected to the structural beam 3. That is, the upper end of the lower precast concrete pipe pile 2 is connected to the structural beam 3 through the steel bars 5, the connecting steel bars 6 and the grouting material (or concrete), which is rigidly connected. A mortar layer 7 is provided between the upper end of the lower precast concrete pipe pile 2 and the beam-column node area 4 and between the lower end of the upper precast concrete pipe pile 1 and the beam-column node area 4.

[0040] The beam-column node of the present invention can form a structural system with other common frames, diagonal braces and shear walls.

[0041] The existing cast-in-place columns and prefabricated columns are all rigidly connected. When constructing the beam-column joint, it is difficult to connect the lower end of the prefabricated column. The existing technology is to connect by sleeve grouting or leaving holes to insert steel bars. However, these two connection methods are both rigid connections, and the connection process is very cumbersome, the construction is complex, the difficulty is high, and the cost is high. Moreover, due to the imperfect detection method of the sleeve grouting connection method, the safety of this connection method cannot be guaranteed.

[0042] The upper end of the precast concrete pipe pile of the present invention adopts the same rigid connection as the cast-in-place structure. Although this is a rigid connection method for the upper end of the precast column in the assembly type, it is as convenient to construct as an ordinary cast-in-place structure. In addition, the use of a rigid connection at one end of the precast concrete pipe pile can improve the rigidity (if both ends are semi-rigid connections, the rigidity may be too low), and the lower end of the precast concrete pipe pile is a semi-rigid connection, which can reduce the connection cost, difficulty and uncertainty, and the bending moment of the pipe pile can be appropriately adjusted to reduce the variable to only the axial force, thereby achieving the purpose of mass production.

[0043] In general, the strength of beams and columns is quite different. If the node area uses the same grade of concrete as the beam, the applicant has verified in laboratory tests and site tests that when the strength of the column is very high, the node will be damaged. However, in actual engineering, the node should not be damaged. If the node uses the same grade of concrete as the column, the strength of the node and the beam concrete will be different, and the node and the beam need to be cast separately, which is very inconvenient.

[0044] In order to solve the above problems, when the difference between the concrete grade of the beam-column node area and the concrete grade of the precast concrete pipe pile is greater than 5MPa, the concrete grade of the beam-column node area 4 of the present invention is the same as the concrete grade of the structural beam 3, and the cross section of the beam-column node area 4 is larger than the cross section of the precast concrete pipe pile. In this embodiment, the cross section of the beam-column node area 4 is square, and its area is larger than the cross section of the precast concrete pipe pile, that is, compared with the existing beam-column node, the applicant has concluded through theoretical analysis and calculation that the beam-column node can be appropriately enlarged in area according to its different bearing capacity, so as to enhance the bearing capacity of the node and reduce the possibility of node damage. In this way, the beam-column node can use concrete with the same strength as the structural beam, so that it can be cast in one go, which is convenient for construction and efficient.

[0045] A construction method for the above-mentioned assembled concrete building beam-column node using precast concrete pipe piles, in this embodiment, the structural beam 3 is a cast-in-place beam, specifically comprising the following steps:

[0046] S1. Install the casting formwork for the beam-column joint area and the structural beam;

[0047] S2. Chisel out the steel bars 5 in the pile body of the lower precast concrete pipe pile 2, exposing a section on its upper end surface, and retain a 2cm grouting layer 7 between the pipe pile and the bottom surface of the node. First clean the joint surface of the pipe pile, place three gaskets above the pipe pile and below the node, check whether the thickness and position of the gaskets shown on the floor are correct, and then use a template to set a square box around the pipe pile, with a height of 5cm below the structural surface. Use appropriate grouting material or grouting material to grout the grouting layer. Hoist the lower precast concrete pipe pile 2 to the installation position, and extend the upper end of the steel bar 5 into the beam-column node area.

[0048] S3. Clean the joint surface of the pile first, place three gaskets under the pile and above the node, check whether the thickness and position of the gaskets shown on the floor are correct, and then use the template to set a square box around the pile, with a height of 5cm above the structural surface. Use appropriate grouting material or grouting material to grout the grouting layer. Lift the upper precast concrete pile 1 to the installation position.

[0049] This embodiment adopts the construction sequence of first grouting and then hoisting, which is more convenient. The gasket can maintain the thickness of the grouting layer to prevent the grouting from being flattened when the component is installed. The square box can surround the grouting area so that the grouting will not flow everywhere. Generally, the grouting material is a grouting material or a grouting material with a strength greater than that of the core grouting material.

[0050] In other embodiments, the process of placing components first and then mortaring can also be adopted, which can be determined according to specific construction conditions.

[0051] S4, insert the connecting steel bar 6 into the upper precast concrete pipe pile 1 and make it pass through the beam-column node area 4 and extend into the lower precast concrete pipe pile 2 to the designed length, and fix the connecting steel bar 6;

[0052] S5. Pour appropriate grouting material or concrete of the same strength from the upper end of the upper precast concrete pipe pile 1 into the pile core and its mortar layer, beam-column joint area, structural beam, and the mortar layer and pile core of the lower precast concrete pipe pile 2 until they are full. That is, the pile core, mortar layer, beam-column joint area 4, cast-in-place beam 3 of the upper precast concrete pipe pile 1 and the mortar layer and pile core of the lower precast concrete pipe pile 2 are cast at one time.

[0053] Example 2

[0054] like Figure 3 As shown, the difference between this embodiment and embodiment 1 is that: in this embodiment, the area of ​​the beam-column node is appropriately enlarged according to the actual bearing capacity of the beam-column node, and the cross-sectional shape of the beam-column node area 4 is a diamond shape, which can enhance the bearing capacity of the node and reduce the possibility of node damage. The beam-column node and the structural beam use concrete of the same strength and can be cast in one time.

[0055] In other embodiments, the beam-column node may also be circular or other shapes. The beam-column node may be shaped appropriately according to actual engineering requirements, which is flexible to use and convenient for actual installation operations.

[0056] In other embodiments, pipe piles of other strengths and types such as PHC / PC with or without prestressed steel bars may be used according to actual engineering needs.

[0057] In other embodiments, grouting material or concrete of any strength may be selected for grouting as required.

[0058] In other embodiments, any type of prestressed or non-prestressed steel bars may be used as required. The steel bars may be of any type, quantity, strength, etc. suitable for actual needs;

[0059] In other embodiments, the structural beams are prefabricated beams or composite beams, and the construction method is similar to that of Embodiment 1. The beam-column nodes are all cast on site, and the specific steps can be adjusted according to the actual site conditions and the types of structural beams.

[0060] The implementation modes of the present invention are not limited to these. Based on the above contents of the present invention, according to the common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, the present invention may also make other various forms of modification, replacement or change, all of which fall within the scope of protection of the present invention.

Claims

1. An assembled concrete beam-column joint using precast concrete pipe piles, characterized in that: It comprises an upper precast concrete pipe pile, a lower precast concrete pipe pile and a structural beam, wherein the upper precast concrete pipe pile, the lower precast concrete pipe pile and the structural beam form a beam-column node area, the steel bars in the pile body of the lower precast concrete pipe pile extend upward to the beam-column node area and are anchored, a plurality of connecting steel bars pass through the beam-column node area and extend into the pile cores of the upper precast concrete pipe pile and the lower precast concrete pipe pile respectively and are anchored, so that the lower end of the upper precast concrete pipe pile is semi-rigidly connected or hinged to the structural beam, while the upper end of the lower precast concrete pipe pile is rigidly connected to the structural beam; the part of the steel bars in the pile body of the lower precast concrete pipe pile extending into the beam-column node area is vertical or curved.

2. The assembled concrete beam-column node according to claim 1, characterized in that: The concrete grade of the beam-column node area is the same as the concrete grade of the structural beam, and the cross-section of the beam-column node area is larger than the cross-section of the precast concrete pipe pile.

3. The assembled concrete beam-column node according to claim 2, characterized in that: The difference between the concrete grade of the beam-column node area and the concrete grade of the precast concrete pipe piles is greater than 5 MPa.

4. The assembled concrete beam-column node according to claim 3 is characterized in that: The cross-sectional shape of the beam-column node area is rectangular, rhombus or circular.

5. The assembled concrete beam-column node according to claim 4, characterized in that: The structural beams are prefabricated beams, cast-in-place beams or composite beams.

6. The assembled concrete beam-column node according to claim 5, characterized in that: A mortar layer is provided between the upper end of the lower precast concrete pipe pile and the beam-column node area, and between the lower end of the upper precast concrete pipe pile and the beam-column node area.

7. The assembled concrete beam-column node according to any one of claims 1 to 6, characterized in that: The precast concrete pipe piles are PHC / PC / PRCI / PRCII hollow pipe piles with or without prestressed steel bars.

8. A construction method for an assembled concrete beam-column joint using precast concrete pipe piles as claimed in claim 1, characterized in that The specific steps include: S1. Install the casting formwork in the beam-column joint area; S2, making the steel bars in the lower precast concrete pipe pile body exposed on its upper end surface; S3, hoist the lower precast concrete piles to the installation position, and extend the upper end of the steel bar into the beam-column node area; S4. Hoist the upper precast concrete piles to the installation position; S5, inserting the connecting steel bars into the upper precast concrete piles and passing through the beam-column node area into the lower precast concrete piles to fix the connecting steel bars; S6. Grouting is performed from the upper end of the upper precast concrete pipe pile into the inner part, that is, the pile core of the upper precast concrete pipe pile, the beam-column joint area and the pile core of the lower precast concrete pipe pile are poured at one time.

9. The construction method according to claim 8, characterized in that: There are gaps between the upper ends of the lower precast concrete pipe piles and the beam-column node area and between the lower ends of the upper precast concrete pipe piles and the beam-column node area. In step S5, during grouting, the gaps are filled to form a grouting layer.

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