CN111945925A - Additional rib FRP (fiber reinforced plastic) longitudinal rib bundling connection vertical prefabricated part - Google Patents

Abstract

The invention discloses an additional rib FRP longitudinal rib to connect a vertical prefabricated member, which comprises a vertical prefabricated member. The vertical prefabricated member is provided with a bundled rib and a corrugated pipe. The bundled rib includes an FRP longitudinal rib and an additional rib. One end of the FRP longitudinal rib is The other end extends out of the vertical prefabricated member, and the other end extends into the bellows. Additional ribs are arranged symmetrically at both ends of the FRP longitudinal rib. A sealing cover is provided at the connection between the top of the bellows and the FRP longitudinal rib, and the lower part of the vertical prefabricated member is connected with the bellows. The grouting port and the grout outlet. The invention is suitable for the marine environment, the components are made of sea water and sea sand concrete, and the materials are obtained on site; the reinforcement is made of fiber-reinforced composite materials, so as to improve the anti-corrosion ability and prolong the life of the structure; additional ribs are arranged at the ends of the FRP longitudinal reinforcement to enhance the anchoring performance and reduce the anchorage. Length and cost saving; FRP longitudinal bars are concentrated in bundles and anchored in the corrugated pipe, which is convenient for construction; the micro-expanded cement-based grouting material in the corrugated pipe forms a three-way compression state to ensure the anchoring performance of the bundled reinforcement.

Description

A kind of additional rib FRP longitudinal reinforcement bundle connection vertical prefabricated member

technical field

The invention relates to an assembled building prefabricated component, in particular to a vertical prefabricated component connected by an additional rib FRP longitudinal reinforcement.

Background technique

A reliable force transmission mechanism is formed by prefabricated and cast-in-place concrete through integral connection (concrete is poured after the joints) to form the vertical load-bearing and horizontal anti-side system of the structure. The overall performance of the structure is required to be basically the same as the cast-in-place structure Similar bearing capacity and deformation capacity, called fabricated concrete structure. It has the advantages of fast construction speed and high quality of components. Rebar sleeve connection is a common connection method for wet connection. Its working principle is as follows: insert the ribbed steel bars to be connected into the metal sleeve to "butt", and fill the sleeve with high-strength, early-strength and micro-expansion cement. The base grouting material forms a large normal stress between the sleeve wall and the steel bar, and generates a large friction force on the rough surface of the ribbed steel bar to realize the transmission of the axial force of the steel bar. However, in actual construction, based on the design concept of "equivalent to cast-in-place", the precast concrete members have many and dense reinforcements, which is difficult and inefficient to install; there are many connection joints, and the cost is high; the lower reinforcement extends into the upper member slightly. Inadvertently, bending and other phenomena are prone to occur, which affects the performance of longitudinal bars, thereby leaving hidden dangers. The research shows that the lap joint of vertical prefabricated members is reliable in performance of lap joints with steel bars. The micro-expanded grout injected into the bellows is in a state of three-way compressive stress, which can enhance the anchoring performance.

For concrete engineering structures facing the marine environment, especially the open sea, etc., it is expensive to transport materials such as sand and water from land. Due to the presence of chloride ions in seawater and sea sand, which can cause metal corrosion, the metal materials are rusted, cracked, thinned, and partially perforated, which reduces the strength of the material, shortens its service life, and even damages its structure. Therefore, the use of seawater sea sand in reinforced concrete is limited and can only be used in plain concrete. In order to ensure the safety and service life of the structure, it is necessary to carry out the anti-corrosion design of the structural components in the design stage.

Fiber reinforced composites (FRP) have the advantages of light weight, high strength and corrosion resistance, and can replace ordinary steel bars to overcome the effects of corrosion. FRP is an anisotropic material and cannot be welded and machined after forming, so it will be more convenient to use a fabricated structure. However, the axial tensile strength of fiber reinforced composite bars (FRP bars) is very high, and the anchoring performance is weak, making it difficult for FRP bars to be used as connecting bars. In addition, in order to anchor the FRP bars, a sufficient anchoring length needs to be set, and the longer the anchorage length is, the greater the height of the FRP bars exposed to the prefabricated components, which is prone to damage during the transportation and installation of the components, which increases the cost.

In general, the engineering structures facing the marine environment are not easy to obtain, the steel bars are easy to corrode, the anchoring performance of the FRP bars is insufficient, and there are many vertical prefabricated components in prefabricated buildings. The sleeve connection joints are difficult to construct.

SUMMARY OF THE INVENTION

Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide an additional rib FRP longitudinal reinforcement bundle connection vertical prefabricated member with high efficiency reinforcement, strong anchoring and suitable for marine environment.

Technical scheme: the additional rib FRP longitudinal bars of the present invention are clustered to connect vertical prefabricated components, including vertical prefabricated components, and vertical prefabricated components are provided with bundled bars and corrugated pipes, and the bundled bars include FRP longitudinal bars and additional ribs. One end of the FRP longitudinal bar protrudes out of the vertical prefabricated member, and the other end extends into the corrugated pipe. Additional ribs are symmetrically arranged at both ends of the FRP longitudinal bar to enhance the anchorage performance and reduce the anchorage length. Sealing cover, the lower part of the vertical prefabricated component is provided with a grouting port and a grout outlet communicating with the bellows.

The bottom of the bellows is flush with the bottom of the vertical prefabricated element. The bundled tendons include more than three FRP longitudinal ribs with additional ribs, and no gap is left between the additional ribs at both ends of each bundle of FRP longitudinal ribs. The vertical precast elements are made of seawater sea sand concrete. The vertical prefabricated member includes a joint surface, and the joint surface is a rough surface to ensure the connection performance between the old and new concrete. Distributed ribs are also arranged in the vertical prefabricated components. The distribution bars are made of fiber reinforced composite (FRP) and prefabricated to design.

The high-strength, early-strength and micro-expansion cement-based grouting material is injected into the bellows through the grouting port, the air is discharged from the grouting outlet, the slurry in the bellows is full, and the grouting material overflows from the grouting outlet, and the grouting material in the bellows will form The three-way compression state is beneficial to improve the strength of the compression zone.

The additional rib is an aluminum alloy tube. The length of the aluminum alloy tube is determined according to the design, and a certain length should be reserved on both sides. On-site processing of aluminum alloy pipes is more convenient and has good anti-corrosion properties. The diameter of the aluminum alloy pipe is about twice the diameter of the FRP longitudinal rib. Install the aluminum alloy pipe to the designated position, extrude it through the cold extrusion process, and attach it to the surface of the FRP longitudinal rib to form additional ribs. The extrusion amount is 2-4mm. .

The FRP longitudinal bars with additional ribs protrude out of the vertical prefabricated members, and can extend into the corrugated pipes of the upper layer members as connecting ribs. Vertical precast elements include shear walls and columns.

The sealing cover is made of stainless steel, and there is a hole in the middle, corresponding to the size of the additional ribs at both ends of the cluster rib. The lower part of the sealing cover is provided with a ring edge, which corresponds to the groove on the upper surface of the stainless steel bellows. When the components are prefabricated, the FRP longitudinal bars pass through the sealing cover to the design position, and use mortar to fill the hole and seal.

Construction steps: Install the aluminum alloy pipe to the designated position, form additional ribs on the surface of the FRP longitudinal rib by extrusion, bind the treated FRP longitudinal rib into a cluster rib, and install the sealing cover into the groove of the stainless steel bellows through the ring edge. , the clustering ribs pass through the holes of the sealing cover to the design position, fill the holes and gaps with mortar and seal, and fix the connected clustering ribs, bellows and distribution ribs in the formwork, and the bottom of the bellows is attached to the surface of the formwork. Pre-embedded Pipelines, pouring concrete and curing to obtain a vertical prefabricated component; before installation, clean the surface of the base layer, sprinkle water to wet and lay a slurry layer, and hoist a single vertical prefabricated component to the installation position by a crane. The construction personnel assist positioning on both sides, The bottom corrugated pipe is aligned with the lower vertical prefabricated member's bundled tendons and slowly falls down to the ground; set up temporary support, adjust the verticality and position of the prefabricated member, and carry out grouting construction through the grouting port to complete the vertical prefabricated member installation.

Beneficial effects: Compared with the prior art, the present invention has the following remarkable features: it is suitable for marine environment, and the components are made of seawater and sea sand concrete, and the materials are obtained locally; the reinforcement is made of fiber-reinforced composite materials, which improves the anti-corrosion ability and prolongs the life of the structure; The bellows and sealing cover are made of stainless steel to prevent corrosion; additional ribs are set at the ends of the FRP longitudinal bars to enhance the anchoring performance, reduce the anchoring length, and save costs; the FRP longitudinal bars are concentrated in bundles and anchored in the bellows, which is convenient for construction; inside the bellows The micro-expanded cement-based grouting material forms a three-way compression state, which is beneficial to ensure the anchoring performance of the cluster reinforcement; the FRP reinforcement-aluminum alloy rib interface has high strength and is more reliable than the FRP reinforcement-concrete interface. Force to achieve anti-slip effect.

Description of drawings

Fig. 1 is the perspective view of shear wall of the present invention;

Fig. 2 is a perspective view of reinforcement reinforcement of shear wall of the present invention;

Fig. 3 is the top view of shear wall of the present invention;

Fig. 4 is the bottom view of shear wall of the present invention;

5 is a perspective view of a prefabricated column of the present invention;

Fig. 6 is the reinforcement schematic diagram of the prefabricated column of the present invention;

Fig. 7 is the top view of the prefabricated column of the present invention;

Fig. 8 is the bottom view of the prefabricated column of the present invention;

Fig. 9 is the structural representation of the bundling rib 2 of the present invention;

Fig. 10 is the connection perspective view of the corrugated pipe 3 and the bundling rib 2 of the present invention;

Fig. 11 is the structural representation of the bellows 3 of the present invention;

Fig. 12 is the first connection schematic diagram of the additional rib 5 of the present invention;

FIG. 13 is a schematic diagram of the second connection of the additional rib 5 of the present invention.

Detailed ways

The directions shown in the drawings in the description are up, down, left and right.

Example 1

As shown in Figures 1 to 4, the vertical prefabricated member 1 is a shear wall, and eight groups of bundled bars 2 are evenly distributed in the shear wall. The number of bundled bars 2 is determined according to the width of the shear wall (the length of the horizontal section). Ribs 2 are bundled by three FRP longitudinal ribs 4 with additional ribs 5 . The bottom of the shear wall is provided with a grouting port 7 and a grout outlet 8, which correspond to the orifices of the stainless steel corrugated pipe 3 respectively. For the cement-based grouting material with micro-expansion characteristics, the air is discharged from the grouting outlet 8, the slurry in the bellows 3 is full, and the grouting material overflows from the grouting outlet 8, and the grouting material in the bellows 3 will form a three-way pressure state. The bottom of the bellows 3 is flush with the bottom of the shear wall, and the top is connected with the sealing cover 6. The FRP longitudinal rib 4 with additional ribs 5 is embedded in the vertical prefabricated member 1, the lower part extends into the bellows 3 through the sealing cover 6, and the part of the upper exposed member 1 can extend into the bellows of the upper vertical prefabricated member 1 3 inside. The additional ribs 5 are symmetrically distributed on the surfaces of both ends of the FRP longitudinal ribs 4 . The shear wall is made of seawater and sea sand concrete, which is obtained locally, and its joint surface 9 is a rough surface. There are also distribution bars 10 in the shear wall, which are prefabricated according to the design, and the distribution bars 10 are preferably FRP bars.

Example 2

As shown in Figures 5-8, the vertical prefabricated member 1 is a column, and four groups of bundled ribs 2 are evenly distributed in the column. The bottom of the column is provided with a grouting port 7 and a grout outlet 8, which correspond to the orifices of the stainless steel bellows 3 respectively. Special cement-based grouting material, the air is discharged from the grout outlet 8, the slurry in the bellows 3 is full, and the grouting material overflows from the grout outlet 8, and the grouting material in the bellows 3 will form a three-way pressure state. The bottom of the bellows 3 is flush with the bottom of the column, and the top is connected with the sealing cover 6 . The FRP longitudinal rib 4 with additional ribs 5 is embedded in the vertical prefabricated member 1, the lower part extends into the bellows 3 through the sealing cover 6, and the part of the upper exposed member 1 can extend into the bellows of the upper vertical prefabricated member 1 3 inside. The additional ribs 5 are symmetrically distributed on the surfaces of both ends of the FRP longitudinal ribs 4 . The column is made of seawater and sea sand concrete, which is made from local materials, and its joint surface 9 is a rough surface. There are also distribution ribs 10 in the column, which are prefabricated according to the design, and the distribution ribs 10 are preferably FRP ribs.

As shown in Figure 9, the three FRP longitudinal ribs 4 with additional ribs 5 in the corrugated pipe 3 are concentrated into bundles, and there is no gap between the additional ribs 5 of the three FRP longitudinal ribs 4 in each bundle, and they are anchored in the corresponding corrugated pipe 3 by grouting. The length of the additional rib is determined according to the design, and a certain length should be reserved on both sides. The diameter of the aluminum alloy tube is about twice the diameter of the FRP longitudinal rib 4, and the radial extrusion amount is 2 to 4 mm.

As shown in Figures 10-11, the FRP longitudinal rib 4 with additional ribs 5 is embedded in the vertical prefabricated member 1, the lower part extends into the bellows 3 through the sealing cover 6, and the upper part exposed to the vertical prefabricated member 1 can be inserted into In the corrugated pipe 3 of the upper vertical prefabricated member 1, the lengths of the precast concrete protruding from both sides are the same, that is, the additional ribs 5 are symmetrical about the height center of the corrugated pipe 3. The sealing cover 6 is made of stainless steel, and a hole 11 is provided in the middle, corresponding to the size of the additional rib 5 of the clustering rib 2 . The lower part of the sealing cover 6 is provided with a ring edge 12 which fits with the corresponding groove 13 of the bellows 3 . When the vertical prefabricated member 1 is prefabricated, the FRP longitudinal rib 4 passes through the sealing cover 6 to the design position, and fills the hole 11 with mortar to seal the gap. When the vertical prefabricated member 1 is poured with concrete, the corrugated pipe 3 is pre-buried at the bottom of the vertical prefabricated member 1 and fixed, and the material is stainless steel. The thickness of the protective layer on the outside of the corrugated pipe 3 should be determined according to the situation, and should not be too large.

As shown in Figures 12-13, the two ends of the FRP longitudinal rib 4 as the connecting rib are provided with additional ribs 7 distributed symmetrically, the aluminum alloy pipe is installed at the designated position, and the section of the aluminum alloy pipe is compressed by extrusion, resulting in plastic deformation. Additional ribs 5 are formed on the surface of the FRP longitudinal ribs 4 . The extrusion device can use electro-hydraulic pliers, etc. The two ends of the aluminum alloy pipe need to be reserved for a length of about 2mm, so as to avoid the notch effect on the FRP longitudinal rib 4 formed by the aluminum alloy pipe end during extrusion. The amount of single extrusion should be small, and the ribs should be rotated continuously to ensure that the aluminum alloy tube is evenly compressed. The additional ribs 5 of the aluminum alloy can be selected as long ribs or short ribs, thereby determining the length of the aluminum alloy tube accordingly.

Claims (10)

1. The utility model provides an additional rib FRP indulges muscle and gathers a bundle and connect vertical prefabricated component which characterized in that: including vertical prefabricated component (1), set up in vertical prefabricated component (1) and restrainted muscle (2) and bellows (3) of collection, muscle (2) are indulged muscle (4) and additional rib (5) including FRP, FRP is indulged muscle (4) one end and is stretched out outside vertical prefabricated component (1), and the other end stretches into bellows (3), FRP is indulged the both ends setting of muscle (4) and is added rib (5), bellows (3) top and FRP are indulged the junction of muscle (4) and are set up sealed lid (6), vertical prefabricated component (1) lower part sets up slip casting mouth (7) and grout outlet (8) with bellows (3) UNICOM.

2. The FRP longitudinal bar bundling and connecting vertical prefabricated part with the additional ribs as claimed in claim 1, wherein: the bottom of the corrugated pipe (3) is flush with the bottom of the vertical prefabricated part (1).

3. The FRP longitudinal bar bundling and connecting vertical prefabricated part with the additional ribs as claimed in claim 1, wherein: the bundling ribs (2) comprise more than three FRP longitudinal ribs (4), and no gap is reserved between the additional ribs (5) at the two ends of each FRP longitudinal rib (4).

4. The FRP longitudinal bar bundling and connecting vertical prefabricated part with the additional ribs as claimed in claim 1, wherein: the vertical prefabricated part (1) is made of seawater and sea sand concrete.

5. The FRP longitudinal rib bundling and connecting vertical prefabricated part as claimed in claim 4, wherein: the vertical prefabricated part (1) comprises a joint surface (9), and the joint surface (9) is a rough surface.

6. The FRP longitudinal bar bundling and connecting vertical prefabricated part with the additional ribs as claimed in claim 1, wherein: and a high-strength early-strength cement-based grouting material with micro-expansion characteristic is injected into the corrugated pipe (3) through a grouting opening (7).

7. The FRP longitudinal bar bundling and connecting vertical prefabricated part with the additional ribs as claimed in claim 1, wherein: distribution ribs (10) are further arranged in the vertical prefabricated part (1).

8. The FRP longitudinal rib bundling and connecting vertical prefabricated part as claimed in claim 7, wherein: the distribution ribs (10) are made of fiber reinforced composite material.

9. The FRP longitudinal rib bundling and connecting vertical prefabricated part as claimed in claim 7, wherein: the additional ribs (5) are aluminum alloy pipes and are fixed on the surface of the FRP longitudinal rib (4) through extrusion.

10. The FRP longitudinal bar bundling and connecting vertical prefabricated part with the additional ribs as claimed in claim 1, wherein: the FRP longitudinal ribs (4) extend out of the vertical prefabricated component and can extend into the corrugated pipe (3) of the upper-layer component.

Images