CN206769200U - First wear formula post stretching vertical prestressing cast-in-place concrete rod structure - Google Patents

Abstract

The utility model relates to a first-through post-tensioning vertical prestressed cast-in-situ concrete column structure. Stress tendons; above the support structure of the anchoring end of the separated combined reinforced concrete prefabricated block, there are integral annular support steel plates, extruded anchors and integral annular fixed steel plates in sequence, and spiral tendons are installed at the bottom of the prestressed tendons near the anchoring end; columns The body is provided with a grouting hole and a spare grouting hole. The supporting steel plate and the fixed steel plate of the utility model both adopt annular integral steel plates, the overall structure is stable, and has good safety performance. The upper and lower interlocking annular steel plates are used to connect as a whole, so that the prestressed steel tendons form a stressed whole, which greatly improves Mechanical properties of prestressed tendons.

Description

Vertical Prestressed Cast-in-situ Concrete Column Structure of First-through Post-tensioning Method

technical field

The utility model relates to a first-through post-tensioning vertical prestressed cast-in-situ concrete column structure, which is suitable for the construction of post-tensioned vertical prestressed cast-in-situ concrete columns.

Background technique

As my country began to promote prestressed concrete structures in 1956. Prestressed structures have passed more than half a century in the history of Chinese architecture. Especially since the 1980s, prestressed concrete structures have been widely used in modern projects such as large public buildings, high-rise and super high-rise buildings, long-span bridges and multi-storey industrial plants. After more than 50 years of hard work and exploration, my country has formed a unique system in the design theory, calculation method, component series, structural system, tension anchorage system, prestressing process, prestressed tendons and concrete materials of prestressed concrete. ; In the prestressed concrete construction technology and construction management, has accumulated rich experience, and achieved good economic and social benefits.

The post-tensioned bonded prestressed concrete technology of cast-in-place is to establish prestress for the concrete structure to meet the design requirements through the processes of pre-embedding pipes, threading reinforcement, tensioning, and grouting. After a long period of practice, horizontal prestressed construction of cast-in-situ concrete structures has become a relatively mature construction technology, which is mainly used in some large-scale long-span public buildings. In recent years, with the continuous changes in the design form of large public buildings, a number of public buildings with super long-span steel structures have gradually appeared in China. The vertical prestressing is bonded, so as to realize the purpose of saving space, reducing cost, shortening construction period, and improving economic and social benefits of the project. Fully developing and utilizing the vertical prestressed frame column structure is a new topic in the research and popularization of architectural science and technology.

To sum up, the research prospects of prestressed cast-in-place concrete columns are broad and have good economic and technical benefits. Technology research and development in this area will achieve good innovative results. In view of this, it is proposed to invent a new type of super-large cross-section frame column post-tensioning method with bonded vertical prestressed structure construction technology, which can be widely used in the construction of buildings designed with vertical prestressed structures. The post-tensioning method has bonded vertical prestress and the connection structure of the concrete structure and the post-tensioning method has the tension control of the bonded vertical prestress construction itself, and the post-tensioning method has bonded vertical prestress and the connection of the frame column Firm and reliable, it controls the coordinated deformation of post-tensioned bonded vertical prestress and frame column concrete structure, ensuring that super-large cross-section frame columns can make full use of post-tensioned bonded vertical prestress in the process of bearing horizontal thrust The horizontal reaction force is applied to the concrete structure, so that the bending moment effect generated by the overall deformation of the super-large cross-section frame column is small, and cracking is avoided.

Contents of the invention

The purpose of the utility model is to provide a first-through post-tensioning vertical prestressed cast-in-situ concrete column structure, which can be widely used in the construction of buildings designed with vertical prestressed structures.

In order to realize the above-mentioned technical purpose, the utility model has adopted the following technical solutions:

A first-through post-tensioning vertical prestressed cast-in-place concrete column structure, which is characterized in that it mainly includes a column body, a separate combined reinforced concrete prefabricated block anchoring end support structure, steel pipes, and prestressed tendons arranged in the steel pipes; separated The upper part of the support structure at the anchorage end of the combined reinforced concrete prefabricated block is provided with an integral annular support steel plate, an extruded anchor and an integral annular fixed steel plate in sequence, and the bottom of the prestressed tendon is installed with a spiral rib near the anchor end; grouting is provided in the column holes and alternate grout holes.

Further, the support structure at the anchoring end of the separated and combined reinforced concrete prefabricated block is composed of concrete, vent holes and an integral annular support steel plate, the integral annular support steel plate is fixed on the concrete by embedded screws and nuts, and the air vent is set of the middle.

The separated steel pipes are fixed by upper and lower interlocking annular steel plates. The upper and lower interlocking annular steel plates are composed of annular interlocking lower steel plates and annular interlocking upper steel plates; As for the short steel bar of the cylindrical steel bar, the annular interlocking upper steel plate is provided with a rivet through hole, and the annular interlocking lower steel plate and the annular interlocking upper steel plate are fixedly connected by rivets.

Post-tensioned vertical prestressed cast-in-place concrete column construction method, the main construction steps are as follows:

1) Preparatory work: processing of prestressed tendons and horse stools and binding of ordinary steel bars;

2) Prefabricated anchor support structure installation:

Concrete columns on the ground floor are constructed using the first-through method, that is, the support structure at the anchor end of the separated combined reinforced concrete prefabricated block is installed in the bottom plate; The circular support steel plate is fixed on the concrete by pre-embedded screws and nuts. There is a vent hole in the middle of the concrete, and a steel bar shelving groove for passing the bottom plate steel bar at the bottom; above the support structure of the anchor end of the separated combined reinforced concrete prefabricated block Set integral annular support steel plate, extruded anchor and integral annular fixed steel plate;

The column between the floors is constructed by the post-passing method. First, the lower anchor end of the prefabricated block is installed, and the steel plate is installed on the top of the lower anchor end of the prefabricated block. The steel plate is connected to the column through a screw;

3) Lay prestressed pipes and prestressed tendons:

For the construction of the first-through method: first install the steel pipes, and the upper and lower interlocking annular steel plates are used to fix the separated steel pipes. The steel plate is provided with steel pipe through holes and short steel bars used to connect the steel bars of the column, the annular interlocked upper steel plate is provided with rivet through holes, and the annular interlocked lower steel plate and the annular interlocked upper steel plate are fixedly connected by rivets; then Lay prestressed tendons, and arrange spare grouting holes and grouting holes;

For post-piercing construction, install steel pipes and spiral bars first, and the steel pipes are divided into straight pipes and curved pipes with the starting point as the boundary, and then prestressed tendons are laid;

4) Fixing of prestressed tendons: the prestressed tendons are fixed at the anchorage end through spiral tendons;

5) Closure of the formwork at the tension end: the tension end adopts a built-in type, and a reserved notch is preset on the top of the frame column. After the tension grouting is completed, the steel bar is welded and the concrete is closed;

6) Concrete pouring: concrete column is poured after the formwork is erected;

7) Anchor cable tensioning, grouting and anchor sealing: After the tensioning is completed, the tunnel grouting can be carried out, and the grouting is carried out layer by layer from bottom to top to the top of the frame column. After the grouting is completed, a second gravity grouting is carried out to ensure the density of the grouting property, the anchor is sealed after the tensioning is completed.

The utility model has the following characteristics and beneficial effects:

(1) In the first-through construction, the prestressed beams are penetrated into the pre-embedded steel pipes before the frame column concrete is poured, which is convenient for construction and does not affect the structural construction period.

(2) The support steel plate and the fixed steel plate of the first-through construction are all made of ring-shaped integral steel plates, and the overall structure is stable and has good safety performance.

(3) The first-passing positioning steel pipe adopts upper and lower interlocking ring-shaped steel plates to form a whole, so that the prestressed tendons form a stressed whole, which greatly improves the mechanical performance of the prestressed tendons.

(4) The bottom of the first-through method is supported by prefabricated blocks with holes and grooves, which has better integrity and mechanical performance compared with steel support.

(5) The prefabricated blocks are equipped with ventilation holes and reinforcement grooves to facilitate construction, and the quality of concrete pouring is also greatly improved.

Description of drawings

Fig. 1 is the structural diagram of the prestressed concrete column of the first penetration method;

Figure 2 is a structural diagram of the post-piercing prestressed concrete column;

Fig. 3 is a schematic diagram of the steel plate under the separated interlock;

Fig. 4 is a schematic diagram of a separated interlocking upper steel plate;

Fig. 5 is a schematic diagram of separate interlocking annular steel plates;

Fig. 6 is a schematic diagram of the support structure at the anchor end of the separated combined reinforced concrete prefabricated block;

Fig. 7 is a schematic diagram of the tension end structure;

Fig. 8 is a construction process flow chart of the utility model.

In the figure: 1-column, 2-spare grouting hole, 3-grouting hole, 4-prestressed tendon, 5-steel pipe, 6-spiral tendon, 7-integral circular fixed steel plate, 8-extrusion anchor, 9 -Integral ring support steel plate, 10-separated combined reinforced concrete prefabricated block anchoring end support structure, 11-anchor end, 12-straight pipe, 13-bending point, 14-bent pipe, 15-lower anchoring end of prefabricated block, 16-Up and down interlocking annular steel plate, 17-Annular interlocking lower steel plate, 18-Annular interlocking upper steel plate, 19-Steel pipe through hole, 20-Short steel bar, 21-Rivet through hole, 22-Rivet, 23-Steel plate, 24-screw rod, 25-embedded screw rod, 26-nut, 27-air vent, 28-steel bar shelving groove, 29-concrete.

detailed description

In this embodiment, the production requirements of prefabricated blocks, steel bar welding construction technology, prestressed tensioning construction operation rules, etc. will not be repeated, and the implementation of the post-tensioned vertical prestressed cast-in-situ concrete column involved in the utility model will be focused on.

Fig. 1 is the structural diagram of the prestressed concrete column with the first penetration method; Fig. 2 is the structural diagram of the post-punctured prestressed concrete column; Fig. 3 is a schematic diagram of the separated interlocked lower steel plate; Fig. 4 is a schematic diagram of the separated interlocked upper steel plate; Fig. 5 is a schematic diagram of separated interlocking annular steel plates; Figure 6 is a schematic diagram of the supporting structure of the anchoring end of a separated combined reinforced concrete prefabricated block; Figure 7 is a schematic diagram of the structure of the tensioned end;

As shown in Fig. 1, the structural diagram of the prestressed concrete column of the first penetration method mainly includes a column body 1, a separated combined reinforced concrete prefabricated block anchorage end support structure 10, a steel pipe 5 and a prestressed tendon 4 located in the steel pipe 5; separation An integral annular support steel plate 9, an extruded anchor 8 and an integral annular fixed steel plate 7 are sequentially arranged above the anchoring end support structure 10 of the combined reinforced concrete prefabricated block, and the bottom of the prestressed tendon 4 is installed with a spiral rib near the anchoring end 11 6; A grouting hole 3 and a spare grouting hole 2 are provided in the column body 1 .

As shown in Fig. 2, the structure diagram of the prestressed concrete column of post-passing method mainly includes the lower anchor end 15 of the prefabricated block, the steel plate 23, the steel pipe 5 and the prestressed tendons 4 arranged in the steel pipe 5; the steel plate 23 is installed under the prefabricated block for anchoring The top of the end 15 is connected to the cylinder through the screw rod 24; the prestressed tendon 4 passes through the steel plate 23 and is fixed to the lower anchor end 15 of the prefabricated block, and the bottom of the prestressed tendon 4 is equipped with a spiral tendon 6. The anchor cable fixing device includes a steel pipe 4 and a spiral rib 6;

As shown in Figure 3-5, the separated steel pipes 5 are fixed by upper and lower interlocking annular steel plates 16, and the upper and lower interlocking annular steel plates 16 are composed of annular interlocking lower steel plates 17 and annular interlocking upper steel plates 18; annular interlocking The lower steel plate 17 is provided with a steel pipe through hole 19 and a short steel bar 20 used to connect the steel bars of the column, and the annular interlocked upper steel plate 18 is provided with a rivet through hole 21, and the annular interlocked lower steel plate 17 and the annular interlocked upper steel plate 18 The connections are fixed with rivets 22.

As shown in Figure 6, the supporting structure of the anchor end of the separated and combined reinforced concrete prefabricated block includes concrete 29, air holes 27 and integral annular support steel plates 9, and the integral annular support steel plates 9 are fixed to the concrete by embedded screws 25 and nuts 26. On 29, air vent is located at the middle part of concrete 29. The bottom of the supporting structure at the anchor end of the separated and combined reinforced concrete prefabricated block is provided with a steel bar shelving groove 28 for passing through the bottom plate steel bar.

As shown in Figure 8, the construction steps of post-tensioned vertical prestressed cast-in-place concrete columns are as follows:

1) Preparatory work: Prestressed tendons 4, processing of horse stools and binding of ordinary steel bars.

2) Prefabricated anchor support structure installation:

The concrete column on the ground floor adopts the first-passing method, that is, the anchor end support structure 10 of the separated combined reinforced concrete prefabricated block is installed in the bottom plate; the anchored end support structure of the separated combined reinforced concrete prefabricated block includes concrete 29, air holes 27 and integral ring support The steel plate 9, the integral annular support steel plate 9 is fixed on the concrete 29 through the embedded screw rod 25 and the nut 26, the middle part of the concrete 29 is provided with a ventilation hole 27, and the bottom is provided with a steel bar shelving groove 28 for passing through the bottom plate steel bar; An integral annular support steel plate 9, an extruded anchor 8 and an integral annular fixed steel plate 7 are sequentially arranged above the anchoring end support structure 10 of the reinforced concrete prefabricated block;

The columns between floors are constructed by the post-passing method. Firstly, the lower anchoring end 15 of the prefabricated block is installed, and the steel plate 23 is installed on the top of the lower anchoring end 15 of the prefabricated block.

The oblique notch method is adopted, and the fixed end is anchored by a clip-type anchor. That is to set a triangular notch or a rectangular block on the side of the super-large cross-section frame column, pre-embed the steel pipe in the column, and then pass the prestressed tendon after the concrete pouring of the frame column is completed. When the concrete strength meets the design requirements, carry out tensioning and grouting . Considering the aesthetic needs of the building's facade, triangular notches are set in the frame columns. In this method, part of the main reinforcement of the frame column needs to be disconnected, and the restoration process will be carried out after the tension grouting is completed.

3) Lay prestressed pipes and prestressed tendons:

For the construction of the first threading method, the steel pipes 5 are first installed, and the separated steel pipes 5 are fixed by upper and lower interlocking annular steel plates 16. The upper and lower interlocking annular steel plates 16 are composed of an annular interlocking lower steel plate 17 and an annular interlocking upper steel plate 18. The steel pipe connection adopts the form of adding a casing, the length of the casing is 100mm, the connection port is fully welded by electric welding, and is wrapped and sealed with waterproof tape. The weld seam needs to be continuous to avoid the clogging of the channel due to slurry leakage. The lower steel plate 17 of the annular interlock is provided with a steel pipe through hole 19 and a short steel bar 20 used to connect the steel bars of the column. The upper steel plate 18 of the annular interlock is provided with a rivet through hole 21. Rivets 22 are fixedly connected between the upper steel plates 18 . Then lay the prestressed tendons 4, and arrange the spare grouting holes 2 and 3.

For back-wearing method, install steel pipe 4, spiral rib 6, steel pipe is divided into straight pipe 12, bent pipe 14, and the two are bounded with inflection point 13.

4) Fixing of prestressed tendons: the prestressed tendons 4 are fixed at the anchoring end 11 through the spiral ribs 6 . The fixed end adopts extruded anchorage, and a steel plate is set at the lower part of the extruded anchorage to facilitate the uniform stress of the prestressed tendon, and the bottom of the steel plate is supported by a Ф32 steel cage. The tunnel is made of steel pipes, and the grouting holes are welded firmly with Ф20 steel pipes. Set grouting holes at the fixed end of the prestressed beam, or use the grouting holes at the fixed end, and set 2 to 3 grouting holes in the middle of the hole, each grouting hole is about 300mm above the floor. The grouting hole is firmly welded with Φ20 steel pipe and steel pipe. The advantage of this method is that it can reduce the grouting pressure loss caused by the influence of height and ensure the compactness of the tunnel.

5) Tension end template closure: The tension end adopts a built-in type, and a 300x300mm notch is pre-set on the top of the frame column, and the depth of the reserved groove is about 150mm. After the tension grouting is completed, the steel bars are welded and the concrete is closed.

6) Concrete pouring: Pour the column concrete after the formwork is erected.

7) Anchor cable tensioning, grouting and anchor sealing: YCW-400 and YCW-250 jacks and ZB-800 high-pressure oil pumps are used for tensioning. After the tensioning is completed, the tunnel grouting can be carried out. When grouting, proceed layer by layer from bottom to top until the top of the frame column. 52.5 ordinary Portland cement is used for grouting, and the grouting strength is ≥M35. After the grouting is completed, a second gravity grouting should be carried out to ensure the compactness of the grouting, and the anchor should be sealed after the tensioning is completed.

Claims (3)

1. A vertical prestressed cast-in-place concrete column structure with post-tensioning method, which is characterized in that it mainly includes a column body (1), a separate combined reinforced concrete prefabricated block anchor end support structure (10), and a steel pipe (5) and the prestressed tendons (4) arranged in the steel pipe (5); the top of the support structure (10) at the anchor end of the separated combined reinforced concrete prefabricated block is sequentially provided with an integral annular support steel plate (9), an extruded anchor (8 ) and an integral annular fixed steel plate (7), the bottom of the prestressed tendon (4) is installed with a spiral rib (6) near the anchoring end (11); the column (1) is provided with a grouting hole (3) and a spare grouting hole (2). 2. The first-through post-tensioning vertical prestressed cast-in-place concrete column structure according to claim 1, characterized in that the support structure (10) at the anchor end of the separated combined reinforced concrete prefabricated block is made of concrete (29) , ventilation holes (27) and an integral annular support steel plate (9), the integral annular support steel plate (9) is fixed on the concrete (29) through embedded screws (25) and nuts (26), and the ventilation holes (27) Be located at the middle part of concrete (29). 3. The vertical prestressed cast-in-place concrete column structure according to claim 1, characterized in that the separated steel pipes (5) are fixed by upper and lower interlocking annular steel plates (16), and the upper and lower The interlocking annular steel plate (16) is composed of an annular interlocking lower steel plate (17) and an annular interlocking upper steel plate (18); the annular interlocking lower steel plate (17) is provided with a steel pipe through hole (19), and is used to connect The short reinforcing bar (20) of the column reinforcement, the annular interlocking upper steel plate (18) is provided with a rivet through hole (21), and the annular interlocking lower steel plate (17) and the annular interlocking upper steel plate (18) are provided with a rivet ( 22) Fixed connection.