A bolt connection structure of a precast beam and a precast column and a construction method thereof

Abstract

The application discloses a bolt connecting structure and construction method of a precast beam and a precast column. The end of the precast beam is provided with a beam end connecting piece, and the precast column is provided with a column connecting plate. The beam end connecting piece is provided with an end plate and a web plate. The end plate is connected with the precast column by using a first bolt assembly, and the column connecting plate and the web plate are connected by using a second bolt assembly. A grouting material is grouted in a beam end grouting area. The construction method comprises the following steps: firstly, hoisting the precast beam to a height for connection with the precast column, and then moving the precast beam horizontally, so that the web plates of the beam end connecting pieces at both ends of the precast beam are in contact with the column connecting plates of the connected precast columns, and the bolt holes on the web plates are one-to-one corresponding; then, sequentially installing the second bolt assembly and the first bolt assembly; and finally, grouting high-strength grouting material in the beam end grouting area. The application does not need to set a temporary support during on-site construction, has no concrete wet work, can avoid taking traditional construction measures, reduces construction cost, and speeds up the construction period.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fabricated structure. BACKGROUND

[0002] At present, for the fabricated concrete frame structure, the general frame column adopts a single-layer prefabricated column, the frame beam adopts a composite beam, and the frame beam and the frame column are rigidly connected through a post-cast joint. This post-cast joint area of the assembled monolithic frame structure is equivalent to a cast-in-place structure in terms of stress performance, and has good seismic performance, but in the field construction, there are many wet operations, and many temporary supports need to be set under the beam and the slab, resulting in that the degree of assembly and the level of industrialization are still not high, the adverse effects on the environment are large, and the advantages of the fabricated structure cannot be fully played.

[0003] For a low multi-story concrete frame structure, due to the low standardization degree of the floor, the use of the above-mentioned traditional assembled monolithic frame structure will result in more prominent problems such as low construction efficiency, high cost, and complex construction measures. In addition to the traditional post-cast joint of the assembled monolithic frame structure, the Chinese Engineering Construction Standardization Association standard “Technical Specification for Assembled Multi-story Concrete Structure” T / CECS 604-2019 gives the basic design requirements of the dry connection assembled structure mainly connected by bolts and welding, and gives the typical bolt connection frame structure form with corbels. However, the bolt connection form in the standard has the following problems:

[0004] 1) The support condition for the end of the prefabricated beam is provided by setting the corbel, resulting in that the prefabricated column has an external protrusion, especially when the prefabricated column needs to be set with corbels on three or four sides, the production process of the prefabricated column is relatively complex, and transportation is not convenient;

[0005] 2) The vertical shear at the end of the beam is resisted by the corbel protruding from the prefabricated column, but the corbel can only resist the vertical downward shear, and cannot resist the vertical upward shear, and for the structure in which the vertical upward shear exists at the end of the beam under the action of the earthquake or wind load, there is no reliable shear mechanism;

[0006] 3) The connector for connecting the longitudinal reinforcement of the beam and the prefabricated column needs to be set for each longitudinal reinforcement, and for the beam with a large number of longitudinal reinforcements, a large number of connectors are used, which causes arrangement and installation difficulties, and the cost is also high. SUMMARY

[0007] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a bolt connection structure of a prefabricated beam and a prefabricated column and a construction method, which can solve the problems of complex construction process, the need to set temporary supports and forms, and large amount of wet work existing in the traditional wet connection structure and construction method.

[0008] To solve the above technical problems, the present application adopts the following technical solutions:

[0009] A bolt connection structure of a precast beam and a precast column, an end part of the precast beam is provided with a beam end connector, a column connecting plate is provided at a connecting part of the precast column and the precast beam, the beam end connector is provided with an end plate and a web, the end plate is connected with the precast column by a first bolt assembly, and the web is connected with the column connecting plate by a second bolt assembly; a region between an end face of the precast beam and a side face of the precast column is a beam end grouting region, the beam end grouting region is grouted with grouting material covering the beam end connector, the column connecting plate, and the first bolt assembly and the second bolt assembly; the beam end connector is integrally combined by steel plates, a thickness of the web is not less than 10 mm, and a thickness of the column connecting plate is not less than 10 mm.

[0010] Preferably, the beam end connector further comprises upper and lower flange plates and a web arranged in parallel and horizontally, the web is connected vertically between the upper and lower flange plates, the upper flange plate is connected vertically with the first end plate, the lower flange plate is connected vertically with the second end plate, and the upper flange plate is connected vertically with the first end plate by a rib plate, and the lower flange plate is connected vertically with the second end plate by a rib plate.

[0011] Preferably, two first rib plates are arranged between the first end plate and an upper surface of the upper flange plate, two second rib plates are arranged between the first end plate and a lower surface of the upper flange plate, two third rib plates are arranged between the second end plate and a lower surface of the lower flange plate, and two fourth rib plates are arranged between the second end plate and an upper surface of the lower flange plate.

[0012] Preferably, a region of the web away from the end plate is embedded in the precast beam and is provided vertically with a weld pin.

[0013] Preferably, partial regions of the upper and lower flange plates are embedded in the precast beam and are welded with longitudinal reinforcement in the precast beam.

[0014] Preferably, a region of the web close to the end plate is provided with a web bolt hole, and the web bolt hole is a horizontal long circular hole.

[0015] Preferably, the precast column is provided with a pre-embedded sleeve at a position corresponding to the first bolt assembly.

[0016] Preferably, for a side node, the pre-embedded sleeve is anchored in the precast column by an anchor rod; and for a middle node, the pre-embedded sleeves on both sides of the precast column are connected by a tension rod.

[0017] Preferably, the column connecting plate is connected with the precast column by a pre-embedded part.

[0018] The technical scheme adopted by the present application is that, in the construction stage, the prefabricated beam is bolted through the web of the beam end connector and the column connecting plate to realize reliable support, and the beam end shear is borne by the column connecting plate; meanwhile, the end plate of the beam end connector is connected with the prefabricated column through the first bolt assembly, so that the tension and pressure can be borne at the same time, and therefore the prefabricated beam and the prefabricated column form a temporary rigid connection structure, i.e. the beam end bending moment can be borne. That is to say, when the grouting area of the beam end has not been grouted or the strength of the grouting material has not reached the design requirement, the temporary rigid connection structure formed by the prefabricated column and the prefabricated beam can support the prefabricated beam and transfer the beam end shear and the beam end bending moment, and through design calculation, the stress requirement of the structure under the action of the gravity load and the wind load in the construction stage can be met, so that the construction safety is ensured.

[0019] In the use stage, the strength of the grouting material in the grouting area of the beam end has reached the design requirement, and through calculation in the design, it can be ensured that the connection area of the prefabricated beam and the prefabricated column has greater rigidity and higher bearing capacity than the range outside the connection area, so that the "strong connection" is ensured, the plastic hinge is formed outside the connection area of the prefabricated beam under the action of the earthquake, the plastic hinge range is still the reinforced concrete section, the ductility and energy dissipation capacity thereof are equivalent to the cast-in-place structure, and then the good seismic performance of the overall structure is ensured.

[0020] Therefore, the present application has the following advantages:

[0021] (1) In the site construction, no temporary support is needed, no concrete wet work is needed, the traditional construction measures can be avoided, the construction cost is reduced, and the construction period is accelerated;

[0022] (2) The beam end connector adopted integrates the support, connection and shear resistance functions, realizes "one device, multiple functions", and avoids the problems of the traditional steel bar connector, such as large quantity, difficult arrangement and high cost;

[0023] (3) In the construction stage, the beam and the column are temporarily rigidly connected, and can completely resist the action of the gravity load and the wind load, so that the construction safety is effectively ensured;

[0024] (4) The site construction process is simple, easy to operate, convenient for the operation personnel to master, and easy to ensure the construction quality.

[0025] These features and advantages of the present application will be disclosed in detail in the following specific embodiments and the accompanying drawings.

DRAWINGS

[0026] The present application will be further described below in combination with the accompanying drawings:

[0027] Figure 1 Fig. 1 is a three-dimensional schematic view of a bolted connection structure of a prefabricated beam and a prefabricated column according to an embodiment of the present application;

[0028] Figure 2aThis is a three-dimensional schematic diagram of the beam end connector;

[0029] Figure 2b This is a front view of the beam end connector;

[0030] Figure 3a A front view showing the construction of the bolted connection between the precast beam and the precast column at the edge node;

[0031] Figure 3b for Figure 3a Detailed AA section view in the middle;

[0032] Figure 3c for Figure 3a Detailed cross-sectional view of BB in the middle;

[0033] Figure 4 A front view of the bolted connection between the precast beam and the precast column at the mid-node.

[0034] Figure 5 This is a schematic diagram of the grouting area at the end of a precast beam.

[0035] Reference numerals: Precast beam 100, longitudinal reinforcement 101, stirrups 102, precast column 200, embedded sleeve 201, anchor rod 202, embedded part 203, tie rod 204, beam end connector 1, upper flange plate 11, lower flange plate 12, first end plate 13, second end plate 14, end plate bolt hole 131, web plate 15, web plate bolt hole 151, welding stud 152, first rib plate 16, second rib plate 17, third rib plate 18, fourth rib plate 19, column connecting plate 2, first bolt assembly 3, first nut 31, second nut 32, short screw 33, second bolt assembly 4, grouting material 300.

Detailed Implementation Methods

[0036] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0037] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0039] In addition, the terms "first", "second", and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0040] The present application is directed to a low multi-layer fabricated frame structure, based on the form of 2-3 stories per section of prefabricated columns, a new type of bolt connection structure and construction method of prefabricated beams and prefabricated columns are proposed. Through the present application, not only the problems of complex construction process, the need for temporary support and formwork, and large amount of wet work existing in the traditional wet connection structure and construction method are solved, but also the problems of inconvenience for component production, imperfect stress mechanism, large number of connectors and high cost existing in the existing dry connection structure and construction method are solved.

[0041] Example one

[0042] Referring to Figure 1 , the present application proposes a bolt connection structure of a prefabricated beam 100 and a prefabricated column 200, the end of the prefabricated beam 100 is provided with a beam end connector 1, the connection part of the prefabricated column 200 and the prefabricated beam is provided with a column connecting plate 2, and the prefabricated beam 100 and the prefabricated column 200 are bolted through a first bolt assembly 3 and a second bolt assembly 4.

[0043] Among them, the beam end connector is made in the factory, and is embedded in the prefabricated beam when the prefabricated beam is made, that is, it forms an integral whole with the prefabricated beam. The column connecting piece is generally connected with the prefabricated column after the prefabricated column is formed. Figure 1 In the present application, the prefabricated column is only one side with a prefabricated beam, when the other side of the prefabricated column also has a beam, the beams and the prefabricated column can adopt the same connection structure as shown in Figure 1 In the present application.

[0044] Referring to Figure 2a , 2bThe beam end connector 1 is composed of an upper flange plate 11, a lower flange plate 12, a web plate 15, a first end plate 13, a second end plate 14, two first rib plates 16, two second rib plates 17, two third rib plates 18 and two fourth rib plates 19, and has the functions of connection, support and shear resistance, and can be integrally welded and fixed. The thickness of the upper flange plate 11 and the lower flange plate 12 should be determined according to the number of longitudinal reinforcement of the precast beam end and the bending bearing capacity requirement of the connection, and should not be less than 12 mm. The thickness of the web plate 15 should be determined according to the bending bearing capacity, shear bearing capacity and other requirements of the beam end connection, and should not be less than 10 mm; the web plate bolt hole 151 is arranged on the web plate 15 near the end plate, the web plate bolt hole 151 adopts a horizontal long circular hole, and the size of the long circular hole should be determined according to the size requirement and installation deviation adjustment requirement of the second bolt assembly 4; the welding nail 152 is arranged on the web plate 15 away from the end plate, and the number and size of the welding nail 152 should be determined according to the anchoring stress requirement of the web plate 15 in the precast beam 100. The width of the first end plate 13 and the second end plate 14 is the same as that of the upper flange plate 11 and the lower flange plate 12 respectively, and the thickness should be determined according to the stress requirement of the first bolt assembly 3; the end plate bolt hole 131 is arranged on the end plate, and the diameter of the end plate bolt hole 131 should be at least 5 mm larger than that of the short screw rod in the first bolt assembly 3, so as to facilitate the installation of the screw rod and ensure that the screw rod only bears tension and pressure, but not shear. The two first rib plates 16 are arranged side by side between the upper surface of the first end plate 13 and the upper surface of the upper flange plate 11 and are vertically welded, the two second rib plates 17 are arranged side by side between the lower surface of the first end plate 13 and the lower surface of the upper flange plate 11 and are vertically welded, the two third rib plates 18 are arranged between the lower surface of the second end plate 14 and the lower surface of the lower flange plate 12 and are vertically welded, and the two fourth rib plates 19 are arranged between the upper surface of the second end plate 14 and the upper surface of the lower flange plate 12 and are vertically welded. The thickness of each rib plate should be determined according to the stress requirement of the first bolt assembly 3, and should not be less than 6 mm.

[0045] Referring to Figure 3a , 3b , 3c, the precast beam 100 is provided with beam longitudinal reinforcement 101 and beam stirrup reinforcement 102, the upper flange plate 11 and the lower flange plate 12 of the beam end connector 1 extending into the precast beam 100 are welded with the upper and lower longitudinal reinforcement of the beam respectively, when the beam longitudinal reinforcement is two rows, the upper surface and the lower surface of the flange plate are welded respectively, the welding requirement should meet the requirement of steel bar and steel plate lap welding, the lap length should be not less than 5 times the diameter of the steel bar when double-sided welding is adopted, and the lap length should be not less than 10 times the diameter of the steel bar when single-sided welding is adopted, the length of the beam end connector 1 extending into the precast beam 100 should meet the stress requirement and should be not less than 150 mm; the welding nails 152 on the web plate 15 should all be located in the precast beam 100. The end surface of the precast beam 100 at the connection is provided with a rough surface, and the concave-convex depth of the rough surface should be not less than 6 mm.

[0046] Further, a pre-embedded sleeve 201 is arranged at the position corresponding to the first end plate 13, the second end plate 14 and the first bolt assembly 3 of the beam end connector on the precast column, the specification of the pre-embedded sleeve 201 should match the specification of the short screw rod 33 in the first bolt assembly 3; the pre-embedded sleeve 201 is reliably anchored in the precast column 200 through the anchoring rod 202, the anchoring rod 202 can adopt a reinforcing bar with an anchoring plate or a hook, or a screw rod with a head, etc.; the side surface of the connection between the precast column 200 and the precast beam 100 is provided with a rough surface, and the concave-convex depth of the rough surface is not less than 6 mm.

[0047] Further, a column connecting plate 2 is arranged at the position corresponding to the web plate 15 of the beam end connector on the precast column 200, the thickness of the column connecting plate 2 should be determined according to the calculation of the shear bearing capacity of the beam end, and is not less than 10 mm; the column connecting plate 2 is provided with bolt holes corresponding to the second bolt assembly 4, the bolt holes adopt standard round holes, and the specification matches the specification of the bolts of the second bolt assembly 4; the column connecting plate 2 is connected with the precast column 200 through the pre-embedded part 203.

[0048] Further, the first bolt assembly 3 is composed of a short screw rod 33, a first nut 31 and a gasket, a second nut 32 and a gasket, the specification of the short screw rod 33 should be determined according to the calculation of the bending bearing capacity of the beam end, the short screw rod 33 passes through the end plate bolt hole 131 of the beam end connector, and is screwed into the pre-embedded sleeve 201; a gap is reserved between the first end plate 13, the second end plate 14 and the pre-embedded sleeve 201, and the width of the gap is not less than 30 mm; the first nut 31 and the gasket are arranged in the gap, and are in close contact and fastened with the end plate; the second nut 32 and the gasket are arranged at the end of the short screw rod 33 close to the precast beam, and are in close contact and fastened with the end plate.

[0049] Further, the second bolt assembly 4 is composed of a common bolt and a matched nut and a gasket, the number and specification of the bolt should be determined according to the calculation of the shear bearing capacity of the beam end; the second bolt assembly 4 is arranged at the web bolt hole 151 of the web plate of the beam end connector and the corresponding bolt hole of the column connecting plate, and is fastened.

[0050] Referring to Figure 4 For the middle node, the precast beams 100 on both sides of the precast column 200 have the same structure as the edge node, and the difference only lies in that the pre-embedded sleeves 201 on both sides of the precast column 200 are connected through the tension rod 204, that is, the tension rod 204 replaces the anchoring rod 202, the material of the tension rod 204 is the same as that of the anchoring rod, and can adopt a reinforcing bar or a screw rod, and the threads are required at the range where the two ends are screwed into the pre-embedded sleeve.

[0051] Referring to Figure 5The area between the end face of the end of the precast beam 100 and the side face of the precast column 200 is a beam end grouting area, and the beam end connector 1, the column connecting plate 2, the first bolt assembly 3 and the second bolt assembly 4 in the area are in an exposed state when the precast beam 100 is installed. After the precast beam 100 is installed in place and the first bolt assembly 3 and the second bolt assembly 4 are installed and fastened, the beam end grouting area is filled and compacted with high-strength grouting material 300.

[0052] Embodiment two

[0053] The application also provides a construction method matched with the precast beam and the precast column bolt connection structure, and specifically comprises the following steps:

[0054] Firstly, the precast beam 100 is hoisted to a height where the precast beam 100 is connected with the precast column 200, and then the precast beam 100 is moved horizontally so that the webs 15 of the beam end connectors 1 at both ends of the precast beam are in contact with the column connecting plates 2 of the connected precast columns, and the bolt holes on the webs 15 and the column connecting plates 2 are in one-to-one correspondence.

[0055] Then, the second bolt assembly 4 is installed, that is, the bolts are passed through the corresponding bolt holes on the webs 15 of the beam end connectors and the column connecting plates 2, and the bolts are fastened with the washers and the nuts. During the installation process, since the web bolt hole 151 is a horizontal long circular hole, the manufacturing deviation of the precast beam 100 can be eliminated by a small amount of movement, so that the precast beam 100 can be installed in place.

[0056] Then, the first bolt assembly 3 is installed, that is, the short screw rod 33 is screwed into the embedded sleeve 201, and the first nut 31 and the washer are installed. After the short screw rod 33 is screwed in place, the second nut 32 and the washer are installed. Then, the first nut 31 and the washer and the second nut 32 and the washer are fastened at the same time. For the multiple groups of first bolt assemblies 3 at the connection, the first bolt assemblies 3 are fastened from top to bottom in turn, and after a round of fastening is completed, the first bolt assemblies 3 are respectively retightened to ensure reliable fastening.

[0057] Finally, after the connection of all the bolt connection parts is reliable, the formwork is arranged around the exposed area of the beam end, the high-strength grouting material 300 is poured into the area, and after 24 hours of standing, the formwork is removed, and the connection construction of the precast beam and the precast column is completed.

[0058] The application can realize the temporary rigid connection structure of the precast beam and the precast column during the construction stage, does not need to set up corbels and temporary supports, can bear various loads during the construction stage, realizes support-free construction, effectively improves the construction efficiency, pours the grouting material in the local area of the beam end, realizes strong connection, guarantees that the structure has good anti-seismic performance during the use stage, thereby realizes the safe and efficient connection of the precast beam and the precast column, and more fully plays the advantages of the fabricated structure in improving quality, efficiency, energy saving and emission reduction.

[0059] The above description is merely a specific implementation of the application, but the protection scope of the application is not limited thereto. Those skilled in the art should understand that the application includes but is not limited to the contents described in the above specific implementation and the accompanying drawings. Any modification that does not deviate from the functional and structural principles of the application will be included in the scope of the claims.

Claims

1. A bolted connection construction of a precast beam and a precast column, characterized by, The end of the prefabricated beam is provided with a beam end connector, and the connecting part of the prefabricated column and the prefabricated beam is provided with a column connecting plate, the beam end connector is provided with an end plate and a web, the end plate is connected with the prefabricated column by a first bolt assembly, and the column connecting plate and the web are connected by a second bolt assembly; the area between the end face of the prefabricated beam and the side face of the prefabricated column is a beam end grouting area, the beam end grouting area is filled with grouting material covering the beam end connector column connector and the first bolt assembly and the second bolt assembly; the beam end connector is integrally combined and welded by steel plates, the thickness of the web is not less than 10 mm, and the thickness of the column connecting plate is not less than 10 mm; The beam end connector further comprises upper and lower parallel and horizontally arranged upper flange plates, lower flange plates and webs, the webs are vertically connected between the upper flange plates and the lower flange plates, the upper flange plates are vertically connected with the first end plates, the lower flange plates are vertically connected with the second end plates, the upper flange plates are vertically connected with the first end plates, and the lower flange plates are vertically connected with the second end plates; Two first rib plates are arranged between the first end plates and the upper flange plate upper surfaces, two second rib plates are arranged between the first end plates and the upper flange lower surfaces, two third rib plates are arranged between the second end plates and the lower flange plate lower surfaces, and two fourth rib plates are arranged between the second end plates and the lower flange plate upper surfaces; The area of the web away from the end plate is embedded in the prefabricated beam and vertically provided with a welding nail; Part of the upper flange plate and the lower flange plate are embedded in the prefabricated beam and welded with the longitudinal reinforcement in the prefabricated beam; The end plate is provided with an end plate bolt hole, and the diameter of the end plate bolt hole should be at least 5 mm larger than the diameter of the short screw rod in the first bolt assembly; The prefabricated column is provided with a pre-embedded sleeve at a position corresponding to the first bolt assembly; the first bolt assembly is composed of a short screw rod, a first nut and a gasket, a second nut and a gasket, the short screw rod passes through the end plate bolt hole of the beam end connector and is screwed into the pre-embedded sleeve, a gap is reserved between the first end plate, the second end plate and the pre-embedded sleeve, and the gap width is not less than 30 mm, the first nut and the gasket are arranged in the gap and tightly contact and fasten the end plate, and the second nut and the gasket are arranged at one end of the short screw rod close to the prefabricated beam and tightly contact and fasten the end plate; The area of the web close to the end plate is provided with a web bolt hole, and the web bolt hole adopts a horizontal long circular hole; The column connecting plate is connected with the prefabricated column through a pre-embedded part.

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