CN206487068U - Assembled FRP strengthens steel core concrete column - Google Patents

Abstract

The utility model is related to a kind of assembled FRP enhancings steel core concrete column, including FRP, steel pipe, core concrete.The assembled cylinder includes some prefabricated subsections, and the prefabricated subsection is divided into protruding end and retraction end.The core concrete stretches out steel pipe, retraction end retraction steel pipe in section protruding end, and stretches out size less than retraction size.Predeterminable duct is used to being in the milk or wearing muscle inside the core concrete.The steel pipe can set filling/slurry outlet at retraction end.The FRP ensures covering section assembling position.Cylinder section assembling process is：Section assembling is positioned, steel-pipe welding, slip casting between section, pastes FRP.Using prestressing force or non-prestressed through muscle cooperation section assembling connection.This novel structure is simple, and good corrosion resistance, stress performance is good, and power transmission is reliable, and steel using amount is few, easy construction, small to surrounding environment influence.The assembling of building structure can be achieved, the requirement of assembled system and feature under adverse circumstances is adapted to.

Description

Prefabricated FRP Reinforced Steel Tube Concrete Column

technical field

The utility model relates to an assembled FRP reinforced steel pipe concrete column structure, which can be used in assembled buildings and bridge projects.

Background technique

FRP (Fiber Reinforced Composite) reinforced concrete-filled steel tube column is a new type of composite structural column formed by arranging FRP sheets in a specific way on the surface of ordinary steel tube concrete. As a lightweight, high-strength, corrosion-resistant high-performance composite material, the introduction of FRP can improve the mechanical properties of the column. By adjusting the arrangement of FRP, the diversity of the mechanical properties of the column can be realized. Therefore, the design of the composite column Strong. In addition, FRP can also be regarded as an anti-corrosion medium to protect the steel pipe, so the introduction of FRP can also effectively improve the durability of the column. Compared with the traditional steel tube concrete column, the FRP reinforced steel tube concrete column is more suitable for such as offshore, island In engineering structures with high anti-corrosion requirements.

Segmentally assembled piers are an assembled column structure used in bridge engineering, and are mostly used in reinforced concrete bridges. The pier is divided into several segments, prefabricated in the factory, and then assembled on site. The use of prefabricated piers can reduce construction damage to the surrounding environment, reduce interference with surrounding traffic, save construction time, and is conducive to large-scale and standardized production of engineering structures and construction quality control.

Based on the structural form of FRP-reinforced concrete-filled steel pipe and the principle of section-assembled piers, this utility model proposes an assembled FRP-reinforced steel-filled concrete column structure, utilizing the characteristics of FRP-enhanced steel-filled concrete composite structures to design reasonable column segments The division and connection methods promote the application of FRP reinforced steel pipe concrete structures in prefabricated buildings.

Utility model content

The utility model proposes a reasonable assembly method of FRP reinforced steel pipe concrete section, so as to ensure that the mechanical properties of the column after assembly will not be reduced due to the installation of the assembly section, and at the same time ensure the simplicity and efficiency of the assembly process and the construction of the column. Operability.

The technical scheme that the utility model adopts is:

A prefabricated FRP-reinforced steel tube concrete column, the column body is spliced by several prefabricated segments; each prefabricated segment is made of core concrete filled inside the steel tube, and FRP is pasted on the outside of the steel tube.

The prefabricated segment is divided into a protruding end and a retracting end. The core concrete protrudes from the steel pipe at the protruding end, and sinks in the steel pipe at the retracting end.

The core concrete of the prefabricated segment is provided with reserved channels for grouting or reinforcement, and the number and position of the reserved channels can be adjusted accordingly depending on the specific design situation.

The core concrete at the protruding end of the prefabricated segment can be made in the form of a constant section or a variable section.

The protruding end and the indenting end of the core concrete of the prefabricated segment may be provided with connectors.

The steel pipe of the prefabricated segment can be provided with a filling/grout outlet at the retracted end; the inner wall of the steel pipe can be provided with a shear connector.

The utility model has the advantages of:

1. The utility model makes full use of the characteristics of the combined form of FRP-reinforced steel pipe concrete, realizes the separation of core concrete and steel pipe splicing positions, and ensures the mechanical properties of the segments after assembly.

2. The utility model reduces the accuracy requirement of segmental core concrete prefabrication by setting cast-in-place segments between adjacent segments, and facilitates construction.

3. The utility model ensures the continuity of the assembled column by arranging FRP in different ways on the surface of the column. At the same time, by adjusting the layout of the FRP, the differentiated structure of the different stress-bearing parts of the column is realized. The column can be Strong design.

Description of drawings

Fig. 1 is a schematic diagram of a prefabricated section of the present invention.

Fig. 2 is a schematic diagram of an optimized prefabricated section of the present invention.

Fig. 3 is a schematic diagram of assembling the prefabricated segments of the present invention.

Fig. 4 is a schematic diagram of assembling the optimized prefabricated segments of the present invention.

detailed description

The assembly process of the assembled FRP-reinforced steel pipe concrete column will be further described in detail below in conjunction with Figures 1-4.

A prefabricated FRP-reinforced steel tube concrete column, the column body is spliced by several prefabricated segments; each prefabricated segment is made of steel tube 1 filled with core concrete 2, and FRP 6 is pasted and arranged outside the steel tube 1.

The prefabricated segment is divided into a protruding end and a retracting end. The core concrete 2 protrudes from the steel pipe 1 at the protruding end, and the steel pipe 1 is sunk at the retracting end.

The core concrete 2 of the prefabricated segment is provided with reserved channels 3-1 for grouting or reinforcement, and the number and position of the reserved channels 3-1 can be adjusted accordingly depending on the specific design situation.

The core concrete at the protruding end of the prefabricated segment can be made in the form of a constant section or a variable section.

The protruding end and the retracting end of the core concrete 2 of the prefabricated segment can be preset with a connector 4 .

The steel pipe 1 of the prefabricated segment can be provided with a filling/grouting port 3-2 at the retracted end; the inner wall of the steel pipe 1 can be provided with a shear connector.

The assembly process is as follows: when assembling, the protruding end of the current segment is inserted into the indented end of the previous segment, after the segment is positioned, the two steel pipes 1 are welded to form a weld area 7, and then through the reserved channel 3-1 to the two The non-shrinking cement mortar 5 is poured between the segments. After the inter-segmental mortar hardens, prestressed or non-prestressed through bars can be selectively used for auxiliary connection, and finally FRP6 is arranged on the surface of the weld area 7 of the prefabricated segment.

Example

1. Prefabricated segment form;

The prefabricated segmental column can have a variety of cross-section forms, such as circular, rectangular, and other special-shaped cross-sections, and can be a single cross-section or a variable cross-section; taking a single circular cross-section segment as an example, including steel pipes and internal core concrete, As shown in Figure 1, at one end of the prefabricated segment, the core concrete protrudes a certain distance from the edge of the steel pipe (this end of the prefabricated segment is referred to as the concrete protrusion); is the concrete indentation end); the core concrete indentation size l ₁ is greater than the other end core concrete protruding size l ₂ ; a hole can be reserved in the core concrete, which can be used as a grouting hole or a reinforcement hole, and the hole runs through the core concrete . Filling/grouting holes can also be set on the steel pipe at the indentation end of the segment. Depending on the situation, one of the two positions of filling/grouting holes can be selected and can also be reserved at the same time. The section size of the prefabricated segment of the variable-section column is adjusted accordingly according to the size of the column facade.

2. Prefabricated segment assembly;

1) Prefabricated segment in place: Insert the protruding end of the concrete of the assembled segment into the indented end of the concrete of the previous segment, and perform segment positioning.

2) Steel pipe welding: Under the premise of ensuring the processing accuracy of the steel pipe section, after the two segments are in place, the front and rear segment steel pipes are in close contact with each other, and the two segment steel pipes are welded at this time.

3) Grouting (or grouting after passing through prestressed steel strands): Since the protruding size of the concrete at the protruding end is smaller than the indentation distance of the concrete at the indented end, the protruding end surface of the core concrete will shrink from the concrete of the previous section after being assembled in place. There is a gap between the entrance faces, and the non-shrinkage mortar is poured through the reserved grouting holes to realize the continuity of the overall core concrete of the column. The strength of the non-shrinkage cement mortar should be higher than that of the prefabricated core concrete, so as to ensure that no weak link appears in the post-casting position of the column. For the cylinder with grouting (outgoing) holes set on the side wall of the segmental steel pipe, the welding plugging operation shall be carried out in due course after the non-shrinking cement mortar hardens.

4. Paste FRP;

If the assembly of the prefabricated segments is completed, according to the design requirements of the column, stick the ring and the longitudinal FRP in different combinations to ensure that the longitudinal FRP covers the welding parts of the steel pipes in each segment, and the overlapping of the longitudinal FRP should avoid the welding positions of the steel pipes as much as possible. FRP can adopt various types, such as CFRP, GFRP, etc., and can also adopt the form of mixed FRP or a combination of different types of FRP in the longitudinal direction of the ring, depending on the design requirements.

3. Optimal design;

As an optimization, the following changes can be made to the prefabricated segment, as shown in Figure 2, and the specific optimization design content depends on the engineering requirements.

1) Tension steel bars or other similar connectors can be preset on the protruding and indented end faces of the core concrete to enhance the connection with the non-shrinking cement mortar and enhance the continuity of the core concrete between different segments.

2) Connectors can be set inside the steel pipe to enhance the integrity of the steel pipe and the core concrete in the same segment.

3) The location, quantity and size of the grouting channels depend on the specific construction conditions.

4) When the reserved channel is used as the hole for piercing reinforcement, prestressed or non-prestressed steel strands can be used for the penetration reinforcement, and prestressed or non-prestressed FRP reinforcement can also be used.

5) When holes are reserved for reinforcement holes, cement mortar can be poured between the reinforcement body and the tunnel or not, but non-shrinkage cement mortar should be poured at the joints of the segments to ensure the continuity of the core concrete.

6) The protruding end of the core concrete can be made into a variable cross-section form to reduce the accuracy requirements of the protruding part of the core concrete during segmental prefabrication. After assembly, the gap between the core concrete and the steel pipe of the previous segment is filled with non-shrinkage cement mortar.

The above-mentioned segmental connection method avoids a large sudden change in the bending stiffness of the column at the segmental assembly point; the column will not be separated under large deformation, and the continuity is better; because it is easier to realize the precision machining of the steel pipe , through the method of later grouting between segments, the position deviation of adjacent segments caused by the geometric defects of the core concrete end face can be compensated, which is beneficial to control the assembly accuracy.

As shown in Figure 3, the splicing steps are as follows: a. Insert the core concrete at the protruding end of the prefabricated segment 2 into the indented end of the segment 1 (the segment that has been assembled in place) during assembly. b. Weld the steel pipe at the joint of segment 1 and segment 2. c. Pour non-shrinkage cement mortar and wait for it to harden. d. Wrap FRP.

The schematic diagram of optimized segment assembly is shown in Figure 4. The splicing steps are as follows: a. During assembly, insert the core concrete at the protruding end of segment 2 into the indented end of segment 1 (the segment that has been assembled in place). b. Use the through ribs 8 reserved in the previous section for positioning, and pass the preset through ribs 8 through the reserved holes. c. The steel pipe at the joint of the rib welding section 1 and section 2. d. Filling with non-shrinkage cement mortar. e. If the prestressed connection is used, the prestressed penetrating tendons are stretched in this step d. Wrapped with FRP.

In order to ensure the pouring quality of non-shrinking cement mortar, the position and quantity of the grouting port can be optimized, and the grouting method can be selected reasonably. After the steel pipe is welded, it is advisable to properly treat the weld joint to ensure that the surface of the cylinder is smooth and facilitate the subsequent FRP pasting operation.

The scope of protection of the present utility model includes but not limited to the products and styles of the above-mentioned specific embodiments, any assembled FRP reinforced steel pipe concrete columns that meet the claims of the utility model and any appropriate changes made by those skilled in the art or Modifications should fall within the protection scope of this patent.

Claims (7)

1. a kind of assembled FRP strengthens steel core concrete column, it is characterised in that：Cylinder is spliced by some prefabricated subsections；Often One prefabricated subsection is made of steel duct filling core concrete, and arrangement FRP is pasted outside steel pipe.

2. assembled FRP as claimed in claim 1 strengthens steel core concrete column, it is characterised in that：

The prefabricated subsection is divided into protruding end and retraction end, and core concrete stretches out steel pipe in protruding end, and cave in steel pipe at retraction end, Protruding end, which stretches out size and is less than retraction end, caves in end size.

3. assembled FRP as claimed in claim 1 strengthens steel core concrete column, it is characterised in that：

Reserving hole channel is set inside the core concrete of the prefabricated subsection, as being in the milk or wear muscle, reserving hole channel quantity and position Put visual specific design situation and make corresponding adjustment.

4. assembled FRP as claimed in claim 1 strengthens steel core concrete column, it is characterised in that：

Prefabricated subsection protruding end core concrete can make normal section or variable cross-section form.

5. assembled FRP as claimed in claim 1 strengthens steel core concrete column, it is characterised in that：

The core concrete protruding end of the prefabricated subsection can be with predetermined coupling parts with retraction end end face.

6. assembled FRP as claimed in claim 1 strengthens steel core concrete column, it is characterised in that：

Filling/grout outlet can be set at retraction end in the steel pipe of the prefabricated subsection；Steel pipe inner wall can set shear connector.

7. assembled FRP as claimed in claim 1 strengthens steel core concrete column, it is characterised in that：

Assembling process is as follows：The protruding end of current prefabricated subsection is inserted to the retraction end of previous prefabricated subsection, prefabricated section during assembling Welded still pipe after Duan Dingwei, is in the milk by reserving hole channel between two prefabricated subsections, after after mortar hardening between prefabricated subsection afterwards Optionally using prestressing force or non-prestressed through muscle progress auxiliary connection, finally in prefabricated subsection join domain surface cloth Put FRP.