CN108978854A - One kind being bolted Precast Concrete Frame - Google Patents

Abstract

A bolted precast concrete frame structure according to the present invention, comprising a plurality of precast concrete columns, a plurality of precast concrete beams, a plurality of precast concrete slabs, a post-cast concrete lamination layer, a plurality of post-cast concrete beam connection node areas and column base grouting In the area, a plurality of precast concrete columns at the bottom are arranged vertically in rows on the ground, precast concrete beams are arranged on two adjacent precast concrete columns in each row, and precast concrete slabs are arranged on two opposite precast concrete beams , the post-cast concrete laminate layer is set on the precast concrete slab, and the post-cast concrete beam connection node area is poured by installing the concrete beam connection node area formwork, and the multiple connectors of the upper precast concrete column and the lower precast concrete column A plurality of upper bolts are connected by a plurality of nuts, and the column base grouting area grouts the gap between the upper precast concrete column and the post-cast concrete laminated layer.

Description

A bolted precast concrete frame structure

technical field

The invention belongs to the technical field of civil engineering, and in particular relates to a bolt-connected prefabricated concrete frame structure.

Background technique

The prefabricated concrete frame structure has fast construction speed, good quality, and can save a lot of formwork and supports. It has significant energy saving and emission reduction characteristics. At the same time, it can realize large spans and meet the requirements of users with large bays. It is a structural form that meets the needs of industrialized building development. .

The connection of prefabricated columns in the existing precast concrete frame structure system usually adopts sleeve grouting connection or grout-anchor lap connection. The sleeve grouting connection is to insert the reserved steel bars of the prefabricated lower column into the pre-embedded sleeve in the prefabricated upper column, and pour high-strength non-shrinking cement mortar into the steel bar and the sleeve through the grouting hole to form a whole; Joint connection means to reserve a hole next to the longitudinal reinforcement of the prefabricated upper column, insert the lapped reinforcement of the prefabricated lower column and seal it with grouting, and there are spiral stirrups in the overlapping range as reinforcing bars to restrain the concrete. Both of the above two connection methods require on-site pressure grouting, which requires high positioning errors of prefabricated component reinforcement and grouting equipment, and problems such as incomplete grouting are prone to occur during construction, which affects the overall performance of the frame structure.

Contents of the invention

In order to solve the above problems, one of the purposes of the present invention is to provide a prefabricated concrete frame structure that not only meets the overall performance requirements, but also has good seismic performance, and at the same time meets the large space requirements, saves materials, and facilitates construction.

The present invention provides a bolted precast concrete frame structure characterized by comprising a plurality of precast concrete columns, a plurality of precast concrete beams, a plurality of precast concrete slabs, a post-cast concrete laminate, a plurality of post-cast concrete beams Connecting the node area and the column base grouting area, in which, a plurality of precast concrete columns at the bottom are vertically arranged on the ground in rows, each row is parallel to each other, adjacent rows and adjacent precast concrete columns are aligned, precast concrete beams It is set on two adjacent precast concrete columns in each row, the precast concrete slab is set on two opposite precast concrete beams, the post-cast concrete laminate layer is set on the precast concrete slab, and the post-cast concrete beam connection node area is installed by installing Concrete beams are connected to the formwork in the joint area, and the joint area is connected by pouring. The upper end of the precast concrete column has multiple upper bolts with exposed concrete, and the lower end has multiple connectors. The upper part of multiple precast concrete columns, the multiple upper bolts of the lower precast concrete columns are exposed to the post-cast concrete laminate layer, and the multiple connectors of the upper precast concrete columns are connected with the multiple upper bolts of the lower precast concrete columns through multiple nuts , the column foot grouting area is installed by installing the column foot grouting area template, including grouting the gap between the upper precast concrete column and the post-cast concrete laminated layer.

In the bolted precast concrete frame structure provided by the present invention, it may also have such a feature: wherein, the lower longitudinal reinforcements of adjacent precast concrete beams are connected by overlapping or welding, and the upper longitudinal reinforcements are arranged in the laminated layer .

In addition, the bolted precast concrete frame structure provided by the present invention may also have such a feature: wherein, the connector is pre-embedded at the bottom of the precast concrete column.

In addition, in the bolted precast concrete frame structure provided by the present invention, it may also have such a feature: wherein, the upper bolts of the precast concrete column at the bottom and the connectors of the precast concrete column at the upper floor of the bottom are connected through matching nuts. connect.

In addition, in the bolted prefabricated concrete frame structure provided by the present invention, it can also have such a feature: wherein, the gap between the precast concrete column bottom of the upper layer and the post-cast concrete lamination layer is poured with UHPC (Ultra High Performance Concrete) , Ultra-High Performance Concrete) forms the UHPC grouting area at the foot of the column.

In addition, in the bolted precast concrete frame structure provided by the present invention, it is characterized in that it also includes a plurality of transverse stirrups, a plurality of longitudinal reinforcements, and a plurality of overlapping reinforcements arranged in the precast concrete column, and the plurality of longitudinal reinforcements are in the form of Rectangular arrangement, a plurality of overlapping steel bars shown are respectively arranged in a rectangle surrounded by longitudinal reinforcements, and a plurality of transverse stirrups are arranged around the outside of the longitudinal reinforcements for binding connection.

In addition, in the bolted prefabricated concrete frame structure provided by the present invention, it may also have the feature that the distance between the transverse stirrups is less than 150mm.

In addition, the bolted precast concrete frame structure provided by the present invention may also have such a feature: wherein, the connectors are arranged at the lower ends of the precast concrete columns and are respectively connected with the overlapping steel bars.

In addition, in the bolted prefabricated concrete frame structure provided by the present invention, it is characterized in that it also includes a plurality of U-shaped stirrups connected with two adjacent connectors.

Function and Effect of Invention

In the bolt-connected precast concrete frame structure of the present invention, the bolt connector is innovatively used to connect the precast concrete columns, and the upper precast concrete column is connected to the lower structure through the bolt connector. The joints and bolt grooves between the precast concrete columns and the bottom members are filled with high-strength grout.

In addition, the prefabricated concrete frame proposed by the present invention can easily adjust the verticality and height of the precast concrete columns without pad support, requires low positioning accuracy (tolerance ±5mm), and does not require additional support when installed in place, and has the advantages of fast construction speed and low environmental pollution. Small size, saving construction period and formwork, etc., meet the needs of housing industrialization.

Furthermore, the prefabricated concrete frame structure proposed by the present invention has good integrity and anti-seismic performance through experimental research.

Furthermore, the experimental research on the prefabricated concrete frame structure proposed by the present invention shows that it not only has a high bearing capacity, but also has good ductility and deformation capacity.

The bolt-connected prefabricated concrete frame structure of the present invention is easy to hoist and locate, convenient to grout, has outstanding bearing capacity and ductility, is applicable to large-storied houses, public buildings and industrial plants, etc., and is in line with the development strategy of my country's green buildings and industrialized buildings. Very broad application prospects.

Description of drawings

Fig. 1 is a two-story two-span schematic diagram of a bolt-connected prefabricated concrete frame structure in an embodiment of the present invention;

Fig. 2 is the schematic diagram of the lower structure of the prefabricated concrete column in the embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view of a prefabricated concrete column in an embodiment of the present invention;

Fig. 4 is a schematic diagram of the connection between the connector and the overlapping steel bar in an embodiment of the present invention;

Fig. 5 is a schematic diagram of the connection between the connector and the positioning reinforcement in an embodiment of the present invention;

Fig. 6 is a schematic diagram of the connecting node area in the prefabricated concrete frame in an embodiment of the present invention;

Fig. 7 is a schematic cross-sectional view of a prefabricated concrete beam in an embodiment of the present invention; and

Fig. 8 is a schematic diagram of the column foot grouting area in the embodiment of the present invention.

Detailed ways

In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the following embodiments will specifically illustrate the bolted precast concrete frame structure of the present invention in conjunction with the accompanying drawings.

Embodiment one

As shown in Figure 1, the bolt-connected precast concrete frame structure includes multiple precast concrete columns 2, multiple precast concrete beams 1, multiple precast concrete slabs 4, post-cast concrete lamination layer 5, and multiple post-cast concrete beam connection nodes Zone 6 and Column Foot Grouting Zone 9.

The plurality of precast concrete columns 2 at the bottom are distributed in a grid shape, and the plurality of precast concrete columns 2 are arranged vertically on the ground in rows, each row is parallel to each other, and the positions of adjacent rows and adjacent precast concrete columns 2 are aligned of.

As shown in Figures 2 and 3, the prefabricated concrete column 2 includes 4 connectors 7, 4 U-shaped stirrups 10, multiple transverse stirrups 11, 4 longitudinal reinforcements 12, 8 overlapping reinforcements 13, and 4 positioning Steel bar 14, 2 additional stirrups 15.

In the embodiment, the prefabricated concrete column 2 is in the form of a square column with a rectangular cross section. 4 longitudinal reinforcing bars 12 are arranged in a rectangular shape, 8 overlapping reinforcing bars 13 are respectively arranged in the rectangle surrounded by 4 longitudinal reinforcing bars 12, and every 2 overlapping reinforcing bars 13 are connected with one longitudinal reinforcing bar 12 respectively, and the lapping reinforcing bars 13 in the embodiment The steel bars 13 and the longitudinal steel bars 12 are connected by overlapping, and a plurality of transverse stirrups 11 are arranged around the outside of the longitudinal steel bars 12 for binding connection. connected.

In the embodiment, the connector 7 includes a fixed plate and a bracket with an L-shaped cross section. The fixed plate has a through hole for allowing bolts to pass through, and is fixedly arranged at the lower end of the bracket. As shown in FIG. 4, the upper end of the bracket is connected to the bracket. 2 overlapping steel bars 13 are fixedly connected.

Four positioning steel bars 14 are respectively fixedly connected with four connectors 7, and the positioning steel bars 14 are L-shaped, as shown in Figure 5, one end of the L-shaped short side is connected with the connector 7, and is located on the outside of the fixed plate, and the L-shaped long side It is arranged in the prefabricated concrete column 2 and parallel to the longitudinal reinforcement 12.

Four U-shaped stirrups 10 are respectively fixedly connected with four connectors 7 and arranged in the precast concrete column 2, and the two sides of each U-shaped stirrup 10 are respectively connected with two adjacent connectors 7 and the U-shaped opening Towards the upper end of the precast concrete column 2.

The two additional stirrups 15 are respectively arranged at the upper end and the lower end of the precast concrete column 2 and are located outside the transverse stirrup 11 .

On the upper end of the prefabricated concrete column 2, four longitudinal steel bars 12 are exposed to the concrete, and threads are arranged at the tops of the four longitudinal steel bars 12 exposed to the concrete.

The precast concrete beam 1 adopts a composite beam structure. The precast concrete beam 1 is set on two adjacent precast concrete columns 2. The ends of the two precast concrete beams 1 are overlapped with the upper end of a precast concrete column 2. The precast concrete The slab 4 is arranged on two prefabricated concrete beams 1 oppositely arranged.

As shown in Figure 6, the connection between the two precast concrete beams 1-1, 1-2 and the upper end of the bottom precast concrete column 2-1 is connected through the post-cast concrete node core area 6, as shown in Figure 7, the adjacent precast The lower longitudinal reinforcement of the concrete beam 1 is connected by lap joint or welding, and the upper longitudinal reinforcement of the precast concrete beam 1 is arranged in the post-cast concrete laminated layer 5 and bound on site. Weld the longitudinal steel bars at the bottom of the 6 beams in the core area of the joint, then bind the stirrups in the core area of the joint, the longitudinal steel bars at the top of the beam, and the distributed steel bars in the superimposed layer. Install the formwork for the node core area 6, cast the node core area 6 and the post-cast concrete laminated layer 5 on site, and expose the node core area 6 and the post-cast concrete laminated layer 5 on the 4 longitudinal steel bars 12 at the upper end of the precast concrete column 2-1 on the bottom layer .

After the strength of the concrete in the node core area 6 reaches 50% of the design strength, the operation of hoisting the upper precast concrete column 2-2 is carried out. First, install four longitudinal steel bars 12 with thread on the upper end of the precast concrete column 2-1 at the bottom. Lower nut, the upper precast concrete column 2-2 is vertically arranged on the top of the bottom precast concrete column 2-1, and the connector 7 of the upper precast concrete column 2-2 passes through the bottom precast concrete column 2-1 The longitudinal steel bar 12 is connected with the lower nut, and then the upper nut is installed on the longitudinal steel bar 12 for connection. The upper precast concrete column 2-2 and the bottom precast concrete column 2-1 are formed by the longitudinal steel bar 12, the connector 7 and the nut. After the connection, the column base area between the upper precast concrete column 2-2 and the post-cast concrete laminate layer 5 on the node core area 6 is installed with the formwork for the column foot grouting area, and the upper precast concrete column 2-2 and the The gaps between the post-cast concrete laminated layers 5 and the depressions of the connectors 7 are grouted, and UHPC (Ultra-High Performance Concrete) is poured to form the UHPC grouting area 9 at the base of the column as shown in FIG. 8 . In the embodiment, the width of the UHPC grouting area 9 exceeds the width a of one side of the precast concrete column 2-2 by 50 mm, and the grouting height h is determined by the height of the bolt connector 7 and the height of the sitting grout layer. This operation is repeated until all prefabricated concrete frame structures are completed.

A method for fabricating a prefabricated concrete frame structure connected by bolts, comprising the following steps:

Step 1, complete the production of precast concrete columns, precast concrete beams, and precast concrete slabs in the precast concrete component factory, and number and transport each component to the construction site;

Step 2, install multiple precast concrete columns adjacent to the column network, the precast concrete columns are connected to the foundation with bolt connectors, and the joints and bolt grooves are grouted;

Step 3, install the precast concrete beam at the position where the precast concrete column installation is completed, the precast concrete beam is erected on the precast concrete column and the support, and the precast concrete beam is adjusted horizontally to align with the precast concrete column;

Step 4, place the precast concrete slab, put the precast slab on the precast beam and support, control the lap length of the precast slab and the precast beam, and the overall size of the precast slab;

Step 5, welding the longitudinal reinforcement at the bottom of the beam in the joint core area of the adjacent prefabricated beams, then binding the stirrups in the joint core area, binding the longitudinal reinforcement at the top of the beam, and binding the distributed reinforcement in the laminated layer;

Step 6, install the formwork in the core area of the node, and pour the core area of the node and the laminated layer on site;

Step 7: After the concrete strength in the core area of the joint reaches 50% of the design strength, the prefabricated upper column is hoisted and a preliminary connection is formed through a bolt connector, and then the joint between the upper precast concrete column and the bottom member and the bolt groove are repaired. grouting;

In step 8, repeat the above steps 2-7 to complete the construction of the entire prefabricated frame structure.

Embodiment two

The present embodiment is the same as the other structure of the first embodiment, except that the ends of the four longitudinal steel bars 12 exposed to the concrete in the first embodiment are replaced by pre-embedded high-strength screw rods.

The top area of the high-strength screw is provided with external threads.

Function and effect of embodiment

In the bolted precast concrete frame structure of this embodiment, a bolt connector is innovatively used to connect the precast concrete columns, and the upper precast concrete column is connected to the lower structure through the bolt connector. The joints and bolt grooves between the precast concrete columns and the bottom members are filled with high-strength grout.

In addition, the precast concrete frame proposed in this embodiment can easily adjust the verticality and height of the precast concrete columns without pad support, requires low positioning accuracy (tolerance ±5mm), and does not require additional support when installed in place. It has the advantages of fast construction speed and environmental protection. It has the advantages of less pollution, saving construction period and formwork, and meets the needs of housing industrialization.

Further, the prefabricated concrete frame structure proposed in this embodiment has good integrity and anti-seismic performance through experimental research.

Furthermore, the experimental research on the precast concrete frame structure proposed in this example shows that it not only has a high bearing capacity, but also has good ductility and deformation capacity.

The bolt-connected prefabricated concrete frame structure of this embodiment is easy to hoist and locate, convenient to grout, has outstanding bearing capacity and ductility, and is applicable to large-storied houses, public buildings and industrial plants, etc., and is in line with the development strategy of green buildings and industrialized buildings in my country. It has a very broad application prospect.

The above embodiments are preferred examples of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (9)

1. A bolted prefabricated concrete frame structure, characterized in that it comprises: a plurality of precast concrete columns, a plurality of precast concrete beams, a plurality of precast concrete slabs, post-cast concrete lamination layers, a plurality of post-cast concrete beam connection node areas and column base grouting areas, Wherein, a plurality of said prefabricated concrete columns at the bottom are respectively vertically arranged on the ground in rows, each row is parallel to each other, and the positions of adjacent rows and adjacent said precast concrete columns are aligned, The precast concrete beams are arranged on two adjacent precast concrete columns in each row, and the precast concrete slabs are arranged on two oppositely arranged precast concrete beams, The post-cast concrete laminate layer is arranged on the precast concrete slab, The post-cast concrete beam connection node area is poured into the connection node area by installing the concrete beam connection node area formwork, The upper end of the prefabricated concrete column has a plurality of upper bolts exposed to the concrete, and the lower end has a plurality of connectors, The plurality of prefabricated concrete columns located on the upper floor of the bottom are respectively vertically arranged on the upper parts of the plurality of prefabricated concrete columns at the bottom, The plurality of upper bolts of the lower precast concrete column exposes the post-cast concrete composite layer, and the plurality of connectors of the upper precast concrete column and the plurality of upper bolts of the lower precast concrete column connection via multiple nuts, The column foot grouting area includes grouting the gap between the upper layer of the precast concrete column and the post-cast concrete laminated layer by installing the column foot grouting area formwork. 2. The bolted precast concrete frame structure according to claim 1, characterized in that: Wherein, the lower longitudinal reinforcements of the adjacent precast concrete beams are connected by overlapping or welding, and the upper longitudinal reinforcements are arranged in the laminated layer. 3. The bolted precast concrete frame structure according to claim 1, characterized in that: Wherein, the connector is pre-embedded at the bottom of the prefabricated concrete column. 4. The bolted precast concrete frame structure according to claim 1, characterized in that: Wherein, the upper bolts of the precast concrete columns at the bottom are connected with the connectors of the precast concrete columns on the upper layer of the bottom through matching nuts. 5. The bolted precast concrete frame structure according to claim 1, characterized in that: Wherein, UHPC (Ultra-High Performance Concrete) is poured into the gap between the bottom of the prefabricated concrete column on the upper layer and the post-cast concrete lamination layer to form a UHPC grouting area at the base of the column. 6. The bolted precast concrete frame structure according to claim 1, further comprising: a plurality of transverse stirrups, a plurality of longitudinal reinforcements, and a plurality of overlapping reinforcements arranged in the precast concrete column, The plurality of longitudinal reinforcement bars are arranged in a rectangular shape, the plurality of overlapping reinforcement bars are respectively arranged in the rectangle surrounded by the longitudinal reinforcement bars, and the plurality of horizontal stirrup bars are arranged around the outer periphery of the longitudinal reinforcement bars for binding connection. 7. The bolted precast concrete frame structure according to claim 6, characterized in that: Wherein, the distance between the transverse stirrups is less than 150mm. 8. The bolted precast concrete frame structure according to claim 6, characterized in that: Wherein, the connector is arranged at the lower end of the prefabricated concrete column and is respectively connected with the overlapping steel bars. 9. The bolted precast concrete frame structure according to claim 1, further comprising: A plurality of U-shaped stirrups connected with two adjacent connectors.