CN103104041B - A kind of adopt cross bolts to connect assembled steel reinforced concrete frame bean column node and construction method - Google Patents

Abstract

A prefabricated reinforced concrete frame beam-column joint connected by transverse bolts, including hidden corbels set on the beams of prefabricated columns, and hidden corbel bolt holes are reserved horizontally on the dark corbels; / There is a notch on the rear side to match with the hidden corbel. The notch is a notch dug from the vertical axis of the prefabricated beam to one side. The cross-sectional shape of the notch and the concealed corbel is the same. Bolt holes for prefabricated beams are reserved along the upper horizontal direction; the width of the concealed corbel along the transverse direction is half of the width of the prefabricated beam along the transverse direction, and the concealed corbel is embedded in the notch groove of the prefabricated beam along the transverse direction and the front and rear of the combination after being embedded There are bolt backing plates on both sides, and the bolts pass through the bolt backing plate, the bolt holes of the concealed corbel and the bolt holes of the prefabricated beam along the transverse direction for fixing. The corresponding construction methods include prefabrication, installation, and gap filling. The invention makes the transmission of internal force between the prefabricated beams and columns clear, the node connection is reliable, the construction operation is simple, and the construction progress is accelerated.

Description

A prefabricated reinforced concrete frame beam-column joint connected by transverse bolts and its construction method

technical field

The invention relates to an assembled reinforced concrete frame beam-column node connected by transverse bolts and a construction method.

Background technique

The prefabricated reinforced concrete frame structure can improve the level of mechanized construction, speed up the construction progress, reduce labor intensity, realize industrialized production of buildings, and help protect the environment. This structural system has been widely used in developed countries and has become the main form of new buildings in some countries. The connection method is the core issue of the prefabricated reinforced concrete structure, and it is also the weak link of the structure. Only when the joint parts of the prefabricated components are reliably connected can the safety and reliability of the structure be guaranteed.

The connection reliability of the existing prefabricated reinforced concrete frame joints in my country is poor, and it is difficult to meet the requirements of structural crack resistance, integrity, and seismic performance. production process. The new prefabricated reinforced concrete frame connection technology requires reliable connection quality to achieve the specified internal force transmission according to the design requirements, and to ensure the safety and integrity of the overall structure; then try to simplify the connection structure and construction process to reduce construction uncertainty In order to improve the construction efficiency of node connection, the influence of sex on structural performance; finally, the prefabricated node will not cause problems in use and perception.

Contents of the invention

The invention provides an assembled reinforced concrete frame beam-column node connected by transverse bolts and a construction method, which makes the internal force transmission between the prefabricated beams and columns clear and the node connection is reliable; the node construction operation is simple, the construction progress is accelerated, and the production can be effectively improved Efficiency; After the nodes are connected, no extra building space is occupied, and the beauty of the building interior is maintained.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: an assembled reinforced concrete frame beam-column node connected by transverse bolts, including the concealed corbel set on the cantilever beam of the prefabricated column, and the transverse reserve on the concealed corbel Hidden corbel bolt hole; the front/rear side of the prefabricated beam end connection is provided with a notch matching with the dark corbel, the notch is a gap dug from the vertical axis of the prefabricated beam to one side, the notch The cross-sectional shape of the concealed corbel is the same as that of the prefabricated beam bolt holes along the transverse direction at the corresponding position at the bottom of the notch; the transverse width of the concealed corbel is half of the transverse width of the prefabricated beam, and The combination fixed in the notch groove of the prefabricated beam and embedded is provided with bolt backing plates on the front and rear sides, and the bolts pass through the bolt backing plate, the concealed corbel bolt holes and the prefabricated beam bolt holes in the transverse direction for fixing.

The cross section of the dark corbel is rectangular or trapezoidal.

Chamfering structures are provided around the notch groove at the end of the prefabricated beam and around the section of the concealed corbel.

A bonding layer is provided between the concealed corbels embedded in each other and the prefabricated beams, and the bonding layer is fine stone concrete or cement mortar.

Exposed bolts and bolt backers are capped with anti-rust paint.

A construction method for a fabricated reinforced concrete frame beam-column joint connected by transverse bolts, the specific steps are as follows:

(1) Analyze the prefabricated reinforced concrete frame structure according to the design parameters of building structure grade, load, span, and storey height, and determine the cross-sectional dimensions and steel bar consumption of prefabricated beams and prefabricated columns; calculate and determine the prefabricated beams according to the shear design requirements at nodes The number of reinforcements inside the beam at the notch groove; the hidden corbel is a short cantilever structure; the number of bolts, the layout form and the size of the bolt backing plate are determined according to the force of the node, and the bolts are ordinary bolts or friction-type high-strength bolts;

(2) Prefabricated columns and prefabricated beams of prefabricated reinforced concrete: prefabricated prefabricated beams and prefabricated columns with hidden corbels in the prefabricated factory according to the design requirements, wherein one side of the hidden corbels of the prefabricated columns is in line with the vertical axis of the prefabricated beams flush, only retain the hidden corbel part on one side of the vertical axis of the prefabricated beam, and reserve the hidden corbel bolt holes crossing the dark corbel in the dark corbel; the beam end of the prefabricated beam is made into a corresponding notch, that is Dig a notch from the vertical axis of the prefabricated beam to one side, the notch and the corbel have exactly the same cross-sectional shape, and the same number of prefabricated beam bolt holes are reserved horizontally at the corresponding position at the bottom of the notch; according to the traditional beam The column prefabrication method is prefabricated, and only the side formwork at the end of the prefabricated beam is adjusted accordingly. After the formwork is supported, the position of the bolt hole of the prefabricated beam is accurately positioned, and the bolt hole pipe is buried, and then the concrete is poured and maintained, and the prefabrication is completed;

(3) Prefabricated reinforced concrete prefabricated beams and prefabricated columns are installed with transverse bolt joints: transport the prefabricated reinforced concrete prefabricated beams and prefabricated columns to the construction site, first install the prefabricated columns with concealed corbels, and install them in place , then hoist the prefabricated beam to the same level as the concealed corbel, and evenly lay a layer of bonding layer in the notch groove of the prefabricated beam, the bonding layer is fine stone concrete or cement mortar, so as to enhance the bonding degree of the concealed corbel and the prefabricated beam , and then slowly move the prefabricated beam body laterally so that the notch groove at the beam end wraps the hidden corbel to realize the combination of the two, and the installation error should meet the allowable error; the chamfering structure is set around the notch groove at the beam end and the dark corbel to prevent the stress concentration of the joints ;Finally, adjust the position of the prefabricated beam so that the bolt holes reserved in the concealed corbel are horizontally aligned with the reserved prefabricated beam bolt holes in the remaining beam body at the notch of the prefabricated beam, then install the bolt backing plate, pass the bolts, and then Tighten the nuts to connect the prefabricated beams with the concealed corbels as a whole;

(4) Prefabricated reinforced concrete prefabricated beams and prefabricated columns are connected by transverse bolts. Follow-up installation work: After the prefabricated beams and concealed corbels are connected as a whole, the gap between the notch groove at the end of the prefabricated beam beam and the concealed corbel is filled with cement Mortar fill and cover all exposed bolts, nuts and bolt backers with anti-rust paint.

The joint strength of the present invention is reliable, the concealed corbel of the prefabricated column and the gap at the end of the corresponding prefabricated beam form a mortise and tenon structure, and the structural measures such as connecting the bolts horizontally to form a whole solve the problem of smooth vertical force transmission between the prefabricated beams and columns. Immediately after the structure is able to bear the load. At the same time, the prefabricated columns have beams of a certain length, and the beams and columns are not assembled in the core area of the beam-column joints, but are assembled and connected on the beams outside the joint positions, reflecting the principles of strong joints and weak components, strong columns and weak beams, ensuring Integrity of beam-column joints.

Concrete beneficial effects of the present invention are:

1. Rectangular (or trapezoidal) hidden corbels and prefabricated beam notch grooves are embedded into each other, and then the two are connected into a whole with bolts, so that the force transmission between prefabricated beams and columns is clear, and the node connection is safe and reliable;

2. The bolt connection node has simple structure and simple construction operation, which speeds up the construction progress and can effectively improve production efficiency;

3. Set the form that the hidden corbel is embedded in the notch groove of the prefabricated beam, which does not occupy the building space and does not affect the use and appearance of the structure;

4. This node is suitable for multi-storey or high-rise prefabricated reinforced concrete frame structures with different spans.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the front elevation view of the prefabricated column with dark corbels;

Fig. 4 is a side elevation view of Fig. 3;

Figure 5 is a front elevation view of the prefabricated beam;

Fig. 6 is a B-B sectional view of Fig. 5 .

Detailed ways

Embodiment: As shown in Figures 1-6, a prefabricated reinforced concrete frame beam-column node connected by transverse bolts includes a concealed corbel 2 set on the cantilever beam of the prefabricated column 1, and the cross section of the concealed corbel 2 is Rectangular or trapezoidal, concealed corbel bolt holes 9 are reserved horizontally on the concealed corbel 2; a notch 6 matching with the concealed corbel 2 is provided on the front/rear side of the prefabricated beam 3 end connection, and the notch 6 In order to dig a gap from the vertical axis of the prefabricated beam 3 to one side, the cross-sectional shape of the gap and the hidden corbel 2 is the same, and the size of the gap is slightly larger than the hidden corbel, so as to facilitate the embedding of the two. Prefabricated beam bolt holes 10 are reserved in the transverse direction; the width of the dark corbel 2 along the transverse direction is half of the width of the prefabricated beam 3 along the transverse direction, and the dark corbel 2 is embedded in the notch groove 6 of the prefabricated beam 3 along the transverse direction and Bolt backing plates 4 are provided on the front and rear sides of the embedded combination, and bolts 5 pass through the bolt backing plate 4, the concealed corbel bolt holes 9, and the prefabricated beam bolt holes 10 through nuts 8 to fix the corbel 2 and the The prefabricated beams 3 are connected as a whole, which can transmit the vertical shear force and bending moment at the beam ends. Chamfering structures are provided around the notch groove 6 at the end of the prefabricated beam 3 and the section around the concealed corbel 2 to avoid stress concentration when the joint is stressed. A bonding layer 7 is provided between the concealed corbels 2 and the prefabricated beams 3 embedded in each other, and the bonding layer 7 is fine stone concrete or cement mortar, so that the concealed corbels 2 and the prefabricated beams 3 are combined more tightly. Exposed bolts 5, nuts 8 and bolt backing plates 4 are sealed with antirust paint.

The positions of the bolt holes of the prefabricated beam bolt holes 10 and the concealed corbel bolt holes 9 should be accurately positioned to ensure that after the two are combined, the bolt holes are aligned left and right, so that the bolts can be threaded smoothly. During the transportation and hoisting of prefabricated components, care should be taken to protect the bolt holes to avoid damage or cracking in the holes. Bolts can be ordinary bolts or friction-type high-strength bolts, and the number, layout and size of the backing plate are determined according to the force requirements. Concealed corbel 2 is a short cantilever structure, and the force is relatively complicated. The longitudinal reinforcement design should be carried out, and the stirrups should be thickened throughout the entire length.

Hoist the prefabricated beam 3 to the same elevation as the concealed corbel 2, so that the concealed corbel 2 is horizontally embedded in the notch 6 of the prefabricated beam 3, and ensure that the concealed corbel bolt holes 9 reserved in the concealed corbel 2 are in line with the prefabricated The bolt holes 10 reserved in the beam 3 are aligned left and right, then the bolt backing plate 4 is installed, the bolt 5 is threaded, and then the nut 8 is tightened, so that the concealed corbel 2 and the prefabricated beam 3 are connected as a whole, and then the load can be carried.

A construction method of a laterally connected assembled reinforced concrete frame beam-column joint, the specific steps are as follows:

(1) Analyze the prefabricated reinforced concrete frame structure according to the design parameters of building structure grade, load, span, and storey height, and determine the cross-sectional size and steel bar consumption of prefabricated beam 3 and prefabricated column 1; calculate and determine according to the shear design requirements at nodes The number of reinforcements inside the beam at the 6 notch slots of the prefabricated beam 3; the hidden corbel 2 is a short cantilever structure; the number and arrangement of bolts 5 and the size of the bolt backing plate 4 are determined according to the force of the nodes, and the bolts 5 are ordinary bolts or friction-type high-strength bolts bolt;

(2) Prefabricated columns and prefabricated beams of prefabricated reinforced concrete: prefabricated prefabricated beams 3 and prefabricated columns 1 with hidden corbels 2 in the prefabricated factory according to the design requirements, wherein one side of the hidden corbels 2 of the prefabricated column 1 is connected to The vertical axis of the prefabricated beam 3 is even, and only the concealed corbel 2 part on one side of the vertical axis of the prefabricated beam 3 is reserved, and the concealed corbel bolt hole 9 crossing the concealed corbel 2 is reserved in the concealed corbel 2; the prefabricated beam The beam end of 3 is made into a corresponding notch 6, that is, a notch 6 is dug from the vertical axis of the prefabricated beam 3 to one side. The concealed corbel 2 is slightly larger to facilitate the assembly of the two, and the same number of prefabricated beam bolt holes 10 are reserved horizontally at the corresponding position at the bottom of the notch groove 6; prefabrication is carried out according to the traditional beam and column prefabrication method, and only the end of the prefabricated beam 3 is prefabricated. Adjust the side formwork accordingly. After the formwork is supported, accurately locate the position of the bolt hole 10 of the prefabricated beam, and bury the bolt hole pipe, then pour concrete and maintain it, and the prefabrication is completed;

(3) Prefabricated reinforced concrete prefabricated beams and prefabricated columns are installed with transverse bolt joints: transport the prefabricated reinforced concrete prefabricated beams 3 and prefabricated columns 1 to the construction site, and install the prefabricated columns 1 with concealed corbels 2 first, After the installation is in place, after the prefabricated beam 3 is hoisted to the same level as the dark corbel 2, a bonding layer 7 is evenly laid in the notch groove 6 of the prefabricated beam 3. The bonding layer is fine stone concrete or cement mortar to strengthen The combination degree of the hidden corbel 2 and the prefabricated beam 3, and then slowly move the prefabricated beam 3 beam body laterally, so that the beam end notch 6 wraps the concealed corbel 2 to realize the combination of the two, and the installation error should meet the allowable error; the beam end notch groove 6 and the surroundings of the hidden corbel 2 are provided with chamfering structures to prevent joint stress concentration; finally, the position of the prefabricated beam 3 is adjusted so that the reserved hidden corbel bolt holes 9 in the hidden corbel 2 are prefabricated Align the remaining prefabricated beam bolt holes 10 horizontally, then install the bolt backing plate 4, pass through the bolt 5, and then tighten the nut 8, that is, the prefabricated beam 3 and the dark corbel 2 are connected as a whole;

(4) The assembled reinforced concrete prefabricated beam and the prefabricated column are connected by transverse bolts. Follow-up work: after the prefabricated beam 3 and the concealed corbel 2 are connected as a whole, the notch groove 6 at the beam end of the prefabricated beam 3 and the concealed corbel 2 are connected. Fill the gaps between them with cement mortar, and seal all exposed bolts 5, nuts 8 and bolt backing plates 4 with antirust paint.

The invention is applicable to multi-layer or high-rise assembled reinforced concrete frame structures, and is also suitable for assembled reinforced concrete frame structures with different spans.

The concealed corbels of the prefabricated columns and the gaps at the ends of the corresponding prefabricated beams are used to form a mortise and tenon structure, and the transverse bolts are used to connect them into a whole, so that the internal force transmission between the prefabricated beams and columns is clear and the joint connection is reliable; the construction operation of this joint It is simple, speeds up the construction progress, and can effectively improve production efficiency. After the nodes are connected, it does not take up extra building space and maintains the beauty of the building interior.

Claims (6)

1. the assembled steel reinforced concrete frame bean column node adopting cross bolts to connect, is characterized in that: comprise hidden bracket set on the semi girder of prefabricated post, hidden bracket laterally reserves hidden bracket bolt hole; The front/rear side of junction, precast beam end is provided with the gap slot coordinated with hidden bracket, described gap slot for cut out a breach from precast beam vertical axis to side, breach is identical with the cross sectional shape of hidden bracket, and the correspondence position bottom gap slot transversely reserves precast beam bolt hole; Hidden bracket width is transversely the half of precast beam width transversely, hidden bracket transversely direction be mounted in precast beam gap slot in and the both sides, front and back of combination after embedding are provided with bolt backing plate, bolt is transversely fixed through bolt backing plate, hidden bracket bolt hole, precast beam bolt hole.

2. the assembled steel reinforced concrete frame bean column node of employing cross bolts connection according to claim 1, is characterized in that: hidden bracket cross section is rectangle or trapezoidal.

3. the assembled steel reinforced concrete frame bean column node of employing cross bolts connection according to claim 2, is characterized in that: gap slot surrounding and the hidden bracket cross section surrounding of precast beam end arrange chamfer configuration.

4. the assembled steel reinforced concrete frame bean column node of employing cross bolts connection according to claim 3, it is characterized in that: between the hidden bracket and precast beam of mutual build-in, be provided with setting course, setting course is pea gravel concreten or cement mortar.

5. the assembled steel reinforced concrete frame bean column node of employing cross bolts connection according to claim 4, is characterized in that: the bolt exposed, the capping of nuts and bolt backing plate antirusting paint.

6. a construction method for the assembled steel reinforced concrete frame bean column node adopting cross bolts to connect, concrete steps are as follows:

(1) according to building structure grade, load, carry out the analysis of assembled steel tendon concrete frame structure across footpath, storey height design parameter, the sectional dimension of precast beam and prefabricated post, amount of reinforcement is determined; Require according to Nodes shear Design to calculate the arrangement of reinforcement quantity determining beam inside, precast beam gap slot place; Hidden bracket is short cantilever construction; According to joints determination bolt quantity, arrangement form and bolting pad board size, bolt adopts plain bolt or frictional high-strength bolts;

(2) prefabricated post of prefabricated assembling type reinforced concrete and precast beam: by designing requirement in the prefabricated precast beam of precast yard and the prefabricated post being with hidden bracket, wherein a side of the hidden bracket of prefabricated post is concordant with precast beam vertical axis, only retain the hidden bracket part of precast beam vertical axis side, the reserved hidden bracket bolt hole crossing hidden bracket in hidden bracket; The beam-ends of precast beam makes corresponding gap slot, and namely from precast beam vertical axis, cut out a gap slot to side, gap slot is identical with the cross sectional shape of hidden bracket, and bottom gap slot, correspondence position also laterally reserves the precast beam bolt hole of equal number; Beam column method for prefabricating traditionally carries out prefabricated, only adjusts accordingly precast beam end side form, and after template support is complete, accurately precast beam bolt hole position, location, and bury bolt hole pipeline underground, concreting, maintenance subsequently, prefabricatedly completes;

(3) assembled steel reinforced concrete precast beam and prefabricated post adopt cross bolts node installation: by the precast beam of the prefabricated steel concrete completed, prefabricated post is transported to builds place, the prefabricated post of first mounting strap hidden bracket, after installation in position, then precast beam is lifted into hidden bracket same level after, evenly one deck setting course is laid in the gap slot of precast beam, setting course is pea gravel concreten or cement mortar, to strengthen the conjugation of hidden bracket and precast beam, slow transverse shifting Prefabricated bar body subsequently, beam-ends gap slot is made to wrap up hidden bracket, both realizations combine, alignment error should meet allowable error, the periphery of beam-ends gap slot and hidden bracket arranges chamfer configuration and prevents node stress from concentrating, finally, adjustment precast beam position makes hidden bracket bolt hole reserved in hidden bracket and precast beam gap slot place remain precast beam bolt hole horizontal alignment reserved in beam body, and then erection bolt backing plate, wears bolt, subsequently by nut screwing clamping, connect into entirety by precast beam and hidden bracket,

(4) assembled steel reinforced concrete prefabricated beam and prefabricated post adopt cross bolts connected node to install follow-up work: after precast beam and hidden bracket connect into entirety, gap cement mortar between prefabricated beam end gap slot and hidden bracket is filled up, and by all exerted bolts, the capping of nuts and bolt backing plate antirusting paint.