CN115573513A - A bolt connection structure and construction method of prefabricated beams and prefabricated columns - Google Patents

Abstract

The invention discloses a bolt connection structure and a construction method of a precast beam and a precast column, wherein the end part of the precast beam is provided with a beam end connecting piece, 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 adopting a first bolt component, and the column connecting plate is connected with the web plate by adopting a second bolt component; grouting materials are poured into the beam end grouting area; the construction method comprises the following steps: firstly, hoisting a precast beam to a height position connected with a precast column, and then moving the precast beam along the horizontal direction to enable webs of beam end connecting pieces at two ends of the precast beam to be in contact with column connecting plates of the connected precast columns, wherein bolt holes on the webs are in one-to-one correspondence; then, sequentially installing a second bolt assembly and a first bolt assembly; and finally, pouring high-strength grouting material in the beam end grouting area. The invention does not need to arrange temporary support during on-site construction, does not have concrete wet operation, can avoid adopting traditional construction measures, reduces the construction cost and quickens the construction period.

Description

A bolt connection structure and construction method of prefabricated beams and prefabricated columns

【Technical field】

The invention belongs to the technical field of assembled structures.

【Background technique】

At present, for prefabricated concrete frame structures, single-layer prefabricated columns are generally used for frame columns, composite beams are used for frame beams, and frame beams and frame columns are rigidly connected through post-cast nodes. This kind of post-cast assembled integral frame structure in the joint area is equivalent to the cast-in-place structure in terms of mechanical performance, and has good seismic performance. However, during on-site construction, there are many wet operations, and more temporary structures need to be installed under the beams and slabs. As a result, the degree of assembly and industrialization is still not high, and the adverse impact on the environment is also relatively large, and the advantages of the assembled structure cannot be fully utilized.

For the low-story concrete frame structure, due to the low degree of floor standardization, the above-mentioned traditional assembled monolithic frame structure will have more prominent problems such as low construction efficiency, high cost, and complicated construction measures. For low multi-storey prefabricated concrete structures, in addition to the prefabricated monolithic frame structure of traditional post-cast joints, the China Engineering Construction Standardization Association standard "Technical Regulations for Prefabricated Multi-storey Concrete Structures" T/CECS 604-2019 provides bolted joints. , The basic design requirements of the dry-connected assembly structure with welding as the main part, and the typical bolt-connected frame structure with corbels are given. However, the bolt connection form in the standard has the following problems:

1) By setting the corbels to provide support conditions for the prefabricated beam ends, the precast columns protrude, especially when the precast columns need to be provided with corbels on three or four sides, the production process of the prefabricated columns is more complicated, and it is not easy to transport;

2) The corbels protruding from the prefabricated columns resist the vertical shear force at the beam end, but the corbels can only bear the vertical downward shear force and cannot bear the vertical upward shear force. For the beam under the action of earthquake or wind load There is a vertical upward shear force at the end, and there is no reliable shear mechanism;

3) Connectors used to connect beam longitudinal reinforcement and prefabricated columns need to be provided for each longitudinal reinforcement. For beams with a large number of longitudinal reinforcement, a large number of connectors are used, which makes arrangement and installation difficult and the cost is high. high.

【Content of invention】

Aiming at the deficiencies of the existing technology, the technical problem to be solved by the present invention is to provide a bolted connection structure and construction method of prefabricated beams and prefabricated columns, which can solve the problems of complex construction technology and the need for temporary supports in the traditional wet connection structure and construction method. And formwork, the problem of large amount of wet work.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A bolt connection structure between a prefabricated beam and a prefabricated column, the end of the prefabricated beam is provided with a beam end connector, the connection between the prefabricated column and the prefabricated beam is provided with a column connecting plate, and the beam end connector is provided with an end plate and The web, the end plate and the prefabricated column are connected by the first bolt assembly, and the column connecting plate and the web are connected by the second bolt assembly; the area between the end face of the prefabricated beam and the side of the prefabricated column is the beam end In the grouting area, the beam end grouting area is filled with grouting material covering the beam end connector, the column connector, the first bolt assembly and the second bolt assembly; the beam end connector is combined and welded by steel plates, and the The thickness of the web is not less than 10mm, and the thickness of the column connecting plate is not less than 10mm.

Preferably, the beam end connector further includes an upper flange plate, a lower flange plate and a web that are vertically parallel and arranged horizontally, the web is vertically connected between the upper flange plate and the lower flange plate, and the upper flange plate and the lower flange plate are vertically connected The flange plate is vertically connected to the first end plate, the lower flange plate is vertically connected to the second end plate, a rib plate is vertically connected between the upper flange plate and the first end plate, and the lower flange plate is vertically connected to the second end plate Connected with ribs.

Preferably, two first ribs are arranged between the first end plate and the upper surface of the upper flange, two second ribs are arranged between the first end plate and the lower surface of the upper flange, and two third The rib plate is arranged between the second end plate and the lower surface of the lower flange plate, and two fourth rib plates are arranged between the second end plate and the upper surface of the lower flange plate.

Preferably, the area of the web away from the end plate is pre-embedded in the prefabricated beam and is vertically provided with welding studs.

Preferably, parts of the upper flange plate and the lower flange plate are pre-embedded in the prefabricated beam and welded with the inner longitudinal reinforcement of the prefabricated beam.

Preferably, web bolt holes are provided on the web near the end plate, and the web bolt holes are horizontal oblong holes.

Preferably, a pre-embedded sleeve is provided at the position corresponding to the prefabricated column and the first bolt assembly.

Preferably, for side nodes, the embedded sleeves are anchored in the prefabricated columns through anchor rods; for middle nodes, the embedded sleeves on both sides of the prefabricated columns are connected by tie rods.

Preferably, the column connecting plate is connected to the prefabricated column through an embedded part.

In the technical scheme adopted by the present invention, during the construction stage, the prefabricated beam is connected by the web plate of the beam end connector and the column connecting plate bolts to realize reliable support, and the beam end shear force is borne by the column connecting plate; at the same time, due to the end of the beam end connecting The plate and the prefabricated column are connected by the first bolt assembly, which can bear both tension and pressure. Therefore, the prefabricated beam and the prefabricated column form a temporary rigid connection structure, which can bear the bending moment at the beam end. That is to say, when the grouting area at the beam end has not yet been grouted or the strength of the grouting material has not yet reached the design requirements, the temporary rigid joint structure formed by the precast column and the precast beam can support the precast beam, transmit the beam end shear force and beam end bending moment, and pass the design The calculation can meet the force requirements of the structure under the action of gravity load and wind load during the construction stage, and ensure construction safety;

In the use stage, the strength of the grouting material in the grouting area at the beam end has reached the design requirements. During the design, the calculation can ensure that the connection area between the prefabricated beam and the prefabricated column has greater rigidity and higher bearing capacity than the area outside the connection area, so as to ensure "Strength" "connection", so that the prefabricated beams form plastic hinges outside the connection area under the action of earthquakes. The range of the plastic hinges is still the reinforced concrete section, and its ductility and energy dissipation capacity are equal to those of the cast-in-place structure, thereby ensuring that the overall structure has good seismic performance. .

Therefore, the present invention has the following advantages:

(1) There is no need to set up temporary supports during on-site construction, and there is no concrete wet work, which can avoid taking traditional construction measures, reduce construction costs, and speed up the construction period;

(2) The beam end connector used integrates the functions of support, connection and shear resistance, realizing "one device with multiple functions", avoiding the large number, difficult arrangement and high cost of traditional steel connectors The problem;

(3) During the construction stage, the beams and columns are temporarily rigidly connected, which can completely resist the effects of gravity load and wind load, effectively ensuring construction safety;

(4) The on-site construction process is simple, easy to operate, convenient for operators to master, and easy to ensure the construction quality.

These features and advantages of the present invention will be disclosed in detail in the following detailed description and accompanying drawings.

【Description of drawings】

Below in conjunction with accompanying drawing, invention is described further:

Fig. 1 is a three-dimensional schematic diagram of a bolt connection structure of a prefabricated beam and a prefabricated column according to an embodiment of the present invention;

Figure 2a is a three-dimensional schematic diagram of a beam end connector;

Figure 2b is a front view of the beam end connector;

Figure 3a is a front view of the bolted connection structure of the prefabricated beam and the prefabricated column at the edge node;

Figure 3b is a detailed view of the section A-A in Figure 3a;

Figure 3c is a detailed view of the B-B section in Figure 3a;

Fig. 4 is the front view of the bolt connection structure of the middle node prefabricated beam and the prefabricated column;

Figure 5 is a schematic diagram of the prefabricated beam end grouting area.

Reference signs: prefabricated beam 100, beam longitudinal reinforcement 101, beam stirrup 102, prefabricated 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 18 , fourth rib 19 , column connection plate 2 , first bolt assembly 3 , first nut 31 , second nut 32 , short screw 33 , second bolt assembly 4 , and grout 300 .

【detailed description】

The technical solutions of the embodiments of the present invention will be explained and described below in conjunction with the accompanying drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention.

Those skilled in the art can understand that, under the condition of no conflict, the features in the following embodiments and implementation manners can be combined with each other.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "under" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

The present invention aims at low multi-storey prefabricated frame structures, and proposes a new type of bolt connection structure and construction method between prefabricated beams and prefabricated columns based on the prefabricated columns having 2 to 3 floors as one section. Through the present invention, not only the The traditional wet connection structure and construction method have problems such as complicated construction technology, temporary support and formwork, and large wet workload. Improvement, large number of connectors and high cost.

Embodiment one

Referring to Fig. 1 , the present invention proposes a bolted connection structure between a prefabricated beam 100 and a prefabricated column 200. A beam end connector 1 is provided at the end of the prefabricated beam 100, and a column connecting plate 2 is provided at the connection between the prefabricated column 200 and the prefabricated beam. 100 is bolted to the prefabricated column 200 through the first bolt assembly 3 and the second bolt assembly 4 .

Wherein, the beam end connectors are made in the factory, and when the prefabricated beams are made, they are pre-embedded in the prefabricated beams, that is, form an integral body with the prefabricated beams. The column connectors are generally connected to the precast column after the precast column is formed. Figure 1 shows that there are prefabricated beams on only one side of the prefabricated column. When there are beams on the other side of the prefabricated column, these beams and the prefabricated column can adopt the same connection structure as shown in Figure 1.

2a, 2b, the beam end connector 1 is composed of an upper flange plate 11, a lower flange plate 12, a web 15, a first end plate 13, a second end plate 14, two first ribs 16, It consists of two second ribs 17, two third ribs 18 and two fourth ribs 19, which have the functions of connection, support and shear resistance, and can be integrally welded and fixed as a whole. The thickness of the upper flange plate 11 and the lower flange plate 12 should be calculated and determined according to the number of longitudinal ribs at the end of the prefabricated beam and the requirements of the bending bearing capacity of the connection, and should not be less than 12mm. The thickness of the web 15 should be calculated and determined according to the requirements of the beam end connection such as bending capacity and shear capacity, and should not be less than 10mm; the web 15 is provided with web bolt holes 151 near the end plate, and the web The bolt hole 151 adopts a horizontal oblong hole, and the size of the oblong hole should be comprehensively determined according to the size requirements of the second bolt assembly 4 and the adjustment requirements of the installation deviation; welding studs 152 are set on the web 15 far away from the end plate, and the number of welding studs 152 and The size should be calculated and determined according to the anchorage stress requirements of the web 15 in the prefabricated beam 100 . The widths of the first end plate 13 and the second end plate 14 are respectively the same as the upper flange plate 11 and the lower flange plate 12, and the thickness should be calculated and determined according to the force requirements of the first bolt assembly 3; Plate bolt hole 131, the diameter of end plate bolt hole 131 should be larger than the diameter of the short screw rod in the first bolt assembly 3 at least 5mm, to facilitate screw rod installation and ensure that screw rod only bears tension, pressure, and does not bear shear force. Two first ribs 16 are arranged side by side between the first end plate 13 and the upper surface of the upper flange plate 11 and welded vertically, and two second ribs 17 are arranged side by side between the first end plate 13 and the upper flange plate 11 Between the lower surfaces and vertical welding, two third ribs 18 are arranged between the second end plate 14 and the lower surface of the lower flange plate 12 and are vertically welded, and two fourth ribs 19 are arranged on the second end plate 14 It is welded vertically to the upper surface of the lower flange plate 12, and the thickness of each rib plate shall be calculated and determined according to the stress requirements of the first bolt assembly 3, and shall not be less than 6mm.

3a, 3b, 3c, prefabricated beam 100 is provided with beam longitudinal reinforcement 101 and beam stirrup 102, and beam end connector 1 extends into the upper flange plate 11 and lower flange plate 12 of the prefabricated beam 100 respectively. The upper longitudinal reinforcement and the lower longitudinal reinforcement are welded. When there are two rows of beam longitudinal reinforcement, they are respectively welded to the upper surface and the lower surface of the flange plate. The welding requirements should meet the requirements for lap welding of steel bars and steel plates. The length of the joint should not be less than 5 times the diameter of the steel bar, and the length of the lap joint should not be less than 10 times the diameter of the steel bar when using a single-sided weld. The welding studs 152 on 15 need to be all located in the prefabricated beam 100. The end surface of the prefabricated beam 100 at the connection is provided with a rough surface, and the depth of the rough surface is not less than 6mm.

Further, on the prefabricated column, the first end plate 13, the second end plate 14 and the first bolt assembly 3 of the beam end connector are provided with embedded sleeves 201, and the specifications of the embedded sleeves 201 should be the same as those of the first bolt assembly. The specifications of the short screw 33 in component 3 match; the embedded sleeve 201 is reliably anchored in the prefabricated column 200 through the anchor rod 202. The anchor rod 202 can be a steel bar with an anchor plate or a hook, or a steel bar with an end screws, etc.; the side surface of the connection between the prefabricated column 200 and the prefabricated beam 100 is provided with a rough surface, and the depth of the rough surface is not less than 6mm.

Further, on the prefabricated column 200, a column connection plate 2 is set at the position corresponding to the web 15 of the beam end connector, and the thickness of the column connection plate 2 should be calculated and determined according to the shear bearing capacity requirements of the beam end, and should not be less than 10mm; the column connection Bolt holes corresponding to the second bolt assembly 4 are provided on the plate 2, and the bolt holes adopt standard round holes, and the specifications match the bolt specifications of the second bolt assembly 4; the column connecting plate 2 is connected to the prefabricated column 200 through the embedded parts 203 .

Further, the first bolt assembly 3 is composed of a short screw 33, a first nut 31 and a washer, a second nut 32 and a washer, and the specifications of the short screw 33 should be calculated and determined according to the requirements for 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 embedded sleeve 201; a gap is reserved between the first end plate 13, the second end plate 14 and the embedded sleeve 201 , the width of the gap is not less than 30mm; the first nut 31 and the gasket are arranged in the gap, and are in close contact with the end plate and fastened; the second nut 32 and the gasket are arranged on the end of the short screw 33 close to the prefabricated beam, and the The plates are in close contact and fastened.

Further, the second bolt assembly 4 is composed of ordinary bolts, matching nuts and washers, and the quantity and specifications of the bolts should be calculated and determined according to the shear bearing capacity requirements of the beam end; the second bolt assembly 4 is arranged on the web of the beam end connector. The web bolt holes 151 of the plate and the corresponding bolt holes on the column connection plate are fastened.

Referring to Fig. 4, for the middle node, compared with the side node, the structure of the prefabricated beam 100 on both sides of the precast column 200 is the same, the difference is only that the embedded sleeve 201 on both sides of the precast column 200 is connected by the tie rod 204, that is, the tie rod 204 is used Instead of the anchor rod 202, the material of the tie rod 204 is the same as that of the anchor rod, steel bars or screw rods can be used, and threads are required at both ends to be screwed into the range of the embedded sleeve.

Referring to Fig. 5, the area between the end surface of the prefabricated beam 100 and the side of the prefabricated column 200 is the beam end grouting area. When the prefabricated beam 100 is installed in this area, the beam end connector 1, the column connecting plate 2, the first bolt assembly 3, The second bolt assemblies 4 are all in an exposed state. After the prefabricated beam 100 is installed in place, and the installation and fastening of the first bolt assembly 3 and the second bolt assembly 4 are completed, the grouting area at the end of the beam is filled and compacted with high-strength grouting material 300 .

Embodiment two

The present invention also provides a matching construction method for the above-mentioned prefabricated beam and prefabricated column bolt connection structure, specifically:

First, the precast beam 100 is hoisted to the height where it is connected to the precast column 200, and then the precast beam 100 is moved horizontally so that the web 15 of the beam end connector 1 at both ends of the precast beam is connected to the column connecting plate of the precast column. 2 contact, the bolt holes on it correspond one by one;

Then, the second bolt assembly 4 is installed, that is, the bolts pass through the corresponding bolt holes on the web 15 of the beam end connector and the column connecting plate 2, and are fastened with washers and nuts; during installation, due to the web bolt holes 151 It is a horizontal oblong hole, so the manufacturing deviation of the prefabricated beam 100 can be eliminated by a small amount of movement to ensure that the prefabricated beam 100 is installed in place;

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 gasket are installed at the same time; after the short screw rod 33 is screwed in place, the second nut 32 and the gasket are installed; At the same time, fasten the first nut 31 and the washer, the second nut 32 and the washer; for multiple sets of first bolt assemblies 3 at the joint, tighten them sequentially from top to bottom, and then respectively Retighten to ensure reliable fastening;

Finally, after all the bolted parts are connected reliably, set up formwork around the area where the beam ends are exposed, pour 300% high-strength grouting material into the area, and after standing for 24 hours, remove the formwork to complete the connection construction of prefabricated beams and prefabricated columns .

The present invention can realize that the prefabricated beam and the prefabricated column form a temporary rigid connection structure in the construction stage, without setting corbels and temporary supports, can bear various loads in the construction stage, realize support-free construction, and effectively improve construction efficiency; Grouting material is poured in the area to achieve strong connection and ensure that the structure has good seismic performance during the use stage, so as to realize the safe and efficient connection of prefabricated beams and prefabricated columns, and make full use of the prefabricated structure in improving quality, efficiency, energy saving and emission reduction advantages.

The above is only a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Those skilled in the art should understand that the invention includes but is not limited to the accompanying drawings and the content described in the above specific embodiment. Any modifications that do not deviate from the functional and structural principles of the invention will be included in the scope of the claims.

Claims (10)

1. A bolt connection structure of a precast beam and a precast column is characterized in that a beam end connecting piece is arranged at the end part of the precast beam, a column connecting plate is arranged at the connection part of the precast column and the precast beam, the beam end connecting piece is provided with an end plate and a web plate, the end plate is connected with the precast column through a first bolt assembly, and the column connecting plate is connected with the web plate through a second bolt assembly; the area between the end face of the precast beam and the side face of the precast column is a beam end grouting area, and grouting materials for coating the beam end connecting piece, the column connecting piece, the first bolt assembly and the second bolt assembly are poured into the beam end grouting area; the beam end connecting piece is integrally formed by combining and welding steel plates, the thickness of the web plate is not less than 10mm, and the thickness of the column connecting plate is not less than 10mm.

2. The bolted connection structure of precast beam and precast column according to claim 1, characterized in that the beam end connection piece further comprises an upper flange plate, a lower flange plate and a web plate, which are arranged in parallel and horizontally up and down, the web plate is vertically connected between the upper flange plate and the lower flange plate, the upper flange plate is vertically connected with the first end plate, the lower flange plate is vertically connected with the second end plate, a rib plate is vertically connected between the upper flange plate and the first end plate, and a rib plate is vertically connected between the lower flange plate and the second end plate.

3. The bolted connection structure of precast beam and precast column according to claim 2, characterized in that two first ribs are provided between the first end plate and the upper surface of the upper flange plate, two second ribs are provided between the first end plate and the lower surface of the upper flange plate, two third ribs are provided between the second end plate and the lower surface of the lower flange plate, and two fourth ribs are provided between the second end plate and the upper surface of the lower flange plate.

4. A precast beam and precast column bolting configuration according to claim 3, wherein the area of said web far from the end plate is embedded in the precast beam and vertically provided with welding nails.

5. The bolted connection structure of precast beam and precast column according to claim 3, characterized in that the local of upper flange plate and lower flange plate is pre-buried in precast beam and welded with the precast beam inner longitudinal bar.

6. The bolted connection structure of precast beam and precast column according to claim 1, wherein a web bolt hole is provided in the area of the web plate close to the end plate, and the web bolt hole is a horizontal slotted hole.

7. The bolted connection structure of precast beam and precast column of claim 1, characterized in that, the precast column sets up pre-buried sleeve with first bolt assembly corresponding to the position.

8. The bolted connection structure of the precast beam and the precast column according to claim 7, wherein for the edge node, the embedded sleeve is anchored in the precast column through an anchoring rod; for the middle joint, the embedded sleeves on two sides of the prefabricated column are connected through the opposite pull rods.

9. The precast beam and precast column bolting configuration according to claim 1, wherein said column connecting plate is connected to the precast column by an embedment.

10. A construction method of a bolt connection structure of a precast beam and a precast column is characterized by comprising the following steps:

firstly, hoisting a precast beam to a height position connected with a precast column, and then moving the precast beam along the horizontal direction to enable webs of beam end connecting pieces at two ends of the precast beam to be in contact with column connecting plates of the connected precast columns, wherein bolt holes on the webs are in one-to-one correspondence;

then, sequentially installing a second bolt assembly and a first bolt assembly;

and finally, erecting a template around the beam end grouting area, pouring high-strength grouting material, standing for 24 hours, and removing the template to finish the connection construction of the precast beam and the precast column.

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