CN107476470A - Steel pipe built in assembled and GFRP pipe regeneration concrete compound shear walls and its construction method - Google Patents

Abstract

The invention discloses an assembled recycled concrete shear wall with built-in steel pipes and GFRP pipes, which includes reinforced steel bars, built-in pipes and concrete wrapping them to form a prefabricated wall. The built-in pipes include built-in steel pipes and built-in GFRP pipes, and the concrete is recycled concrete. The present invention replaces part of the steel pipes built in the shear wall with GFRP pipes to give full play to the advantages of good deformation performance of steel pipes and light weight and high strength of GFRP pipes, which can not only enhance the bearing capacity of the structure, but also reduce the weight of prefabricated components. Accordingly, the inventor has also established a corresponding construction method. The application of the present invention can realize prefabricated industrial production and assembly construction of recycled concrete composite shear wall structures with built-in steel pipes and GFRP pipes, and realize the recovery of a large amount of concrete waste generated in the production process of prefabricated component factories while improving the level of construction quality control. Recycle.

Description

Prefabricated built-in steel pipe and GFRP pipe recycled concrete composite shear wall and its construction method

technical field

The invention belongs to the technical field of built-in steel pipe concrete composite shear walls, in particular to an assembled built-in steel pipe and GFRP pipe recycled concrete composite shear wall and a construction method thereof.

Background technique

Reinforced concrete shear wall is an important force-bearing member in high-rise and super high-rise building structures, mainly bearing vertical and horizontal loads. In order to improve the mechanical performance of the reinforced concrete shear wall, steel pipes are placed inside the wall to form a built-in steel pipe concrete shear wall. At present, the construction process of the built-in steel pipe concrete shear wall is mainly steel pipe positioning → steel bar binding → formwork support → concrete pouring → concrete curing. Although the built-in CFST shear wall has the advantages of high bearing capacity and good seismic performance, there are problems such as complex hoisting of steel pipes on site and heavy workload for binding steel bars in the shear wall. The construction organization has put forward higher requirements.

In recent years, my country has put forward the development goal of the industrialization of prefabricated assembly structures, and clearly stated that by 2020, the proportion of structural main body industrialization in new buildings will reach 30% to 50%, and by 2025 it will reach 50% to 70%. The prefabricated assembly structure can realize the industrial production of prefabricated components, and has the advantages of fast construction speed and reliable quality.

Contents of the invention

The technical problem to be solved by the present invention is to provide an assembled built-in steel pipe and GFRP pipe recycled concrete composite shear wall and its construction method, which are light in weight, high in strength, convenient in production, simple in construction, easy in replacement, and can realize recycling of construction waste.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

The prefabricated built-in steel pipe and GFRP pipe recycled concrete composite shear wall includes stressed steel bars, built-in pipes and concrete wrapping them to form a prefabricated wall. The built-in pipes include built-in steel pipes and built-in GFRP pipes, and the concrete is recycled concrete.

When the thickness of the prefabricated wall is less than 500mm, the prefabricated wall is split and prefabricated along the height direction according to 2 times the storey height and the side of the wall is provided with beam brackets or board brackets; Double layer height for split prefabrication.

The outer wall of the built-in steel pipe is equipped with stud connectors, the studs are welded to the pipe wall, and the outer wall of the built-in GFRP pipe is equipped with GFRP shear connectors.

The built-in pipes are arranged in parallel along the width direction of the prefabricated wall, and the built-in steel pipes are arranged at both ends of the width of the prefabricated wall. The distance between the centers of adjacent built-in pipes is 2D-5D, and D is the outer diameter of the smaller outer diameter of the built-in steel pipe and the built-in GFRP pipe.

The stress reinforcement includes vertical reinforcement and horizontal distribution reinforcement. The spacing between vertical reinforcement and horizontal distribution reinforcement should not be greater than 300mm. Tension reinforcement is set between the reinforcement mesh composed of vertical reinforcement and horizontal distribution reinforcement. The distribution spacing of tie reinforcement is 100mm. -200mm.

Built-in steel pipes, built-in GFRP pipes, vertical steel bars, and horizontally distributed steel bars all extend out of the prefabricated wall; U-shaped splicing grooves are arranged at both ends of the width of the prefabricated wall along the height direction, and U-shaped tie bars are evenly arranged in the grooves. The diameter of the tie bars should not be less than 12mm and the length of the middle into the wall meets the anchoring requirements, and the spacing of the U-shaped tie bars should not be greater than the spacing of the horizontally distributed bars.

Recycled concrete is processed from concrete waste from the production of precast elements and has a strength not lower than C40.

The construction method of the above-mentioned prefabricated built-in steel pipe and GFRP pipe recycled concrete composite shear wall is as follows:

<1> In the horizontal direction, connect the horizontally distributed steel bars of the composite shear wall members of two assembled built-in steel pipes and GFRP pipe recycled concrete, and the U-shaped tie bars in the U-shaped splicing grooves of two adjacent shear walls are connected to each other. Staggered, and arrange no less than 2 vertical bars in the intersecting area;

<2> In the height direction, when assembling and constructing the recycled concrete composite shear wall components of the two assembled built-in steel pipes and GFRP pipes, firstly connect and position the built-in steel pipes and the built-in GFRP pipes in the upper and lower shear walls; at the same time , the vertical steel bars in the upper and lower shear walls are reliably connected; when the prefabricated shear wall components are located at the bottom of the structure, the vertical steel bars and pipes at the wall joints are reliably connected with the pre-embedded steel bars and pipes on the foundation;

<3> When the assembled built-in steel pipe and GFRP pipe recycled concrete composite shear wall is connected to the end column, the horizontally distributed reinforcement protruding from the wall is reliably connected to the preset horizontal tie reinforcement on the end column;

<4> After the steel pipes and steel bars are connected, formwork is supported and concrete is poured at the joints of walls and walls, walls and end columns, walls and foundations;

<5> Concrete is poured inside the built-in pipe of the assembled built-in steel pipe and GFRP pipe recycled concrete composite shear wall.

The strength grade of the concrete poured in step <4> and step <5> is one level higher than the strength grade of the recycled concrete used in the prefabricated components.

Aiming at the problems existing in the existing built-in steel pipe concrete shear wall, the inventor designed and prepared an assembled built-in steel pipe and GFRP pipe recycled concrete composite shear wall, including stressed steel bars, built-in pipes and concrete wrapping them to form a prefabricated wall , the built-in pipes include built-in steel pipes and built-in GFRP pipes, and the concrete is recycled concrete. The present invention replaces part of the steel pipes built in the shear wall with GFRP pipes to give full play to the advantages of good deformation performance of steel pipes and light weight and high strength of GFRP pipes, which can not only enhance the bearing capacity of the structure, but also reduce the weight of prefabricated components. Based on this, the inventor also established a corresponding construction method: firstly divide the shear wall into reasonable sections, then prefabricate the wall components in sections in the prefabricated component factory, and use the large amount of energy produced by the prefabricated component factory during the production process. High-quality concrete waste, the concrete waste is recycled and prepared into recycled concrete for the preparation of shear wall wall components; after the shear wall components reach the predetermined strength, the components are transported to the construction site for assembly, and finally form a A combined shear wall structure with built-in steel pipes and GFRP pipes with good overall performance. The application of the present invention can realize prefabricated industrial production and assembly construction of recycled concrete composite shear wall structures with built-in steel pipes and GFRP pipes, and realize the recovery of a large amount of concrete waste generated in the production process of prefabricated component factories while improving the level of construction quality control. recycle

Compared with the prior art, the present invention has the following advantages:

(1) The prefabricated built-in steel pipe and GFRP pipe recycled concrete composite shear wall can be processed in the production workshop, which reflects the advantages of industrialized building construction, reduces the procedure of on-site pipe hoisting, and reduces the construction process of the built-in steel pipe shear wall structure. The requirements for the site conditions in the middle reduce the complexity of the construction organization and help to improve the construction quality and efficiency of the structure.

(2) Since the prefabricated component factory will produce a large amount of concrete waste, recycling the above waste and preparing it into recycled concrete can realize the recycling of construction waste, and achieve high environmental protection value while achieving good economic benefits.

(3) When the shear wall components suffer from earthquake damage or other damage, it is convenient to replace and maintain the components.

Description of drawings

Figure 1 is a schematic diagram of the structure of the prefabricated built-in steel pipe and GFRP pipe recycled concrete composite shear wall when the height is prefabricated according to the height of one storey.

Fig. 2 is a side view of the shear wall in Fig. 1 .

Fig. 3 is a top view of the shear wall in Fig. 1 .

Fig. 4 is a sectional view of the shear wall A-A in Fig. 1 .

Fig. 5 is a B-B sectional view of the shear wall in Fig. 2 .

Figure 6 is a schematic diagram of the composite shear wall structure of the prefabricated built-in steel pipe and GFRP pipe recycled concrete when the height is prefabricated according to the height of 2 floors.

Fig. 7 is a side view of the shear wall in Fig. 6 .

Fig. 8 is a top view of the shear wall in Fig. 6 .

Fig. 9 is a C-C sectional view of the shear wall in Fig. 6 .

Fig. 10 is a D-D sectional view of the shear wall in Fig. 7 .

Figure 11 is a schematic diagram of the connection between the built-in steel pipe and the GFRP pipe recycled concrete composite shear wall member and the end column.

Fig. 12 is a sectional view of E-E in Fig. 11 .

Figure 13 is a schematic diagram of horizontal installation of two adjacent built-in steel pipes and GFRP pipe recycled concrete composite shear wall components.

Fig. 14 is a sectional view of F-F in Fig. 13 .

In the figure: 1 horizontally distributed reinforcing bars, 2 U-shaped tie bars, 3 built-in GFRP pipes, 4 built-in steel pipes, 5 vertical reinforcing bars, 6 U-shaped splicing grooves, 7 between vertical reinforcing bars and horizontally distributed reinforcing bars ties, 8 plate supports or beam supports, 9 structural foundations, 10 pre-embedded vertical reinforcements, 11 pre-embedded pipes, 12 pre-embedded horizontal tie bars on end columns, 13 vertical bars, 14 End columns, 15 precast walls.

detailed description

Development of prefabricated built-in steel pipe and GFRP pipe recycled concrete composite shear wall

1. Design principle

(1) The built-in steel pipe can effectively improve the vertical bearing capacity of the reinforced concrete shear wall structure.

(2) GFRP pipe has the characteristics of light weight and high strength, which can reduce the self-weight of the structure; however, due to the relatively poor shear bearing capacity of GFRP pipe, GFRP pipe can only be used to replace some steel pipes.

(3) The prefabricated assembly shear wall can realize the industrialization of production and ensure the quality of wall construction; by assembling at the construction site, the construction efficiency is greatly improved.

(4) Recycle and reuse a large amount of concrete waste generated in the production process of the prefabricated component factory, and achieve high environmental protection value while achieving good economic benefits.

2. Basic structure

As shown in Figures 1 to 14, the assembled built-in steel pipe and GFRP pipe recycled concrete composite shear wall includes stressed steel bars, built-in pipes and concrete wrapping them to form a prefabricated wall 15, and the built-in pipes include built-in steel pipes 4 and built-in GFRP pipes 3 , The concrete is recycled concrete.

The size of the prefabricated shear wall is customized according to the project requirements, and its basic size should comprehensively consider the influence of factors such as hoisting, transportation and force: as shown in Figure 1 to Figure 5, when the thickness of the prefabricated wall is less than 500mm, the prefabricated wall along the The height direction is split and prefabricated according to 2 times the storey height, and the side of the wall should be provided with board brackets or beam brackets 8, and embedded parts are preset on the beam brackets or board brackets as required for the connection between the wall and the beam board; as shown in Figure 6 Referring to Figure 10, when the thickness of the prefabricated wall is greater than 500mm, the prefabricated wall should be split and prefabricated along the height direction according to 1 times the storey height.

Before the hoisting and temporary positioning of steel pipes and GFRP pipes, stud connectors are arranged on the outer wall of the built-in steel pipe. The arrangement and quantity of studs should meet the requirements of the current code. Connection, the built-in GFRP pipes are connected through special sleeves and adhesives, and the outer wall of the built-in GFRP pipes should be provided with special GFRP shear connectors. Before the wall is installed and positioned, no concrete is poured inside the steel pipes and GFRP pipes in the prefabricated shear wall components.

The built-in pipes are arranged in parallel along the width direction of the prefabricated wall. In order to ensure the deformation capacity of the wall, only built-in steel pipes can be arranged at both ends of the width of the prefabricated wall. The center distance between adjacent built-in pipes is 2D-5D, and D is the built-in steel pipe and the built-in GFRP. The outside diameter of the tube with the smaller outside diameter.

The reinforced steel bars include vertical steel bars 5 and horizontally distributed steel bars 1. According to the thickness of the wall, double-layer or multi-layer reinforcement can be used in the wall. The distance between vertical steel bars and horizontally distributed steel bars should not be greater than 300mm. Tension reinforcement bars 7 are arranged between the reinforcement mesh sheets composed of vertical reinforcement bars and horizontal distribution reinforcement bars, and the distribution spacing of the tie reinforcement bars should be 100-200mm.

Prefabricated connection and anchorage measures on the four sides of the prefabricated wall: built-in steel pipes, built-in GFRP pipes, vertical steel bars, and horizontally distributed steel bars should all go outside the prefabricated wall. 300mm; the length of the steel bars protruding from the prefabricated wall should meet the requirements of the anchorage length of the steel bars, and the processing shape and size error of the steel bars should not be greater than ±10mm; U-shaped splicing grooves 6 are set along the height direction at both ends of the prefabricated wall width, and the grooves Evenly arrange U-shaped tie bars 2. The diameter of U-shaped tie bars should not be less than 12mm and the length inserted into the wall should meet the anchoring requirements. The spacing of U-shaped tie bars should not be greater than the spacing of horizontally distributed bars.

Recycled concrete is processed from concrete waste produced in the production of prefabricated components, and its strength should not be lower than C40. Q345, Q390 and Q420 grades are preferred for built-in steel pipes; HRB335 and HRB400 grades are preferred for vertical reinforcement and horizontal distribution reinforcement.

3. Construction method

<1> As shown in Figures 13 to 14, in the horizontal direction, hoist the prefabricated wall to the installation position for preliminary positioning; connect the horizontally distributed steel bars of the composite shear wall components of the two assembled built-in steel pipes and GFRP pipe recycled concrete shear walls (using Sleeve connection, binding connection or welding), the U-shaped tie bars in the U-shaped splicing grooves of two adjacent shear walls should be staggered, and no less than two vertical inserts with a diameter of 12mm should be arranged in the intersecting area. Tendon 13;

<2> In the height direction, when assembling and constructing the recycled concrete composite shear wall components of two pieces of fabricated built-in steel pipes and GFRP pipes, firstly connect and position the built-in steel pipes and built-in GFRP pipes in the upper and lower shear walls, and the steel pipes Bolts or welded connections can be used for connection, and special sleeve connections can be used for GFRP pipe connections. The installation error of the centerlines of the upper and lower pipes should be controlled within ±5mm; at the same time, the vertical steel bars in the upper and lower shear walls should be reliably connected ( Sleeve connection, binding connection or welding can be used); when the prefabricated shear wall components are located at the bottom of the structure, the vertical steel bars and pipes at the wall joints should be compatible with the pre-buried vertical steel bars 10 on the structural foundation 9 and the pre-buried Pipe 11 is reliably connected;

<3> As shown in Figure 11 to Figure 12, when the assembled built-in steel pipe and GFRP pipe recycled concrete composite shear wall is connected to the end column 14, the horizontally distributed reinforcement protruding from the wall should be in line with the horizontal tension embedded on the end column Reinforcements 12 are reliably connected; end columns can be prefabricated or cast-in-place components;

<4> After the steel pipes and steel bars are connected, formwork is supported and concrete is poured at the splicing joints of walls and walls, walls and end columns, walls and foundations; the strength of post-cast concrete should be higher than that of recycled concrete used in prefabricated shear wall components The strength is increased by one strength level, and the concrete used should have early strength;

<5> Concrete is poured inside the built-in pipe of the prefabricated built-in steel pipe and GFRP pipe recycled concrete composite shear wall, and the strength grade of the concrete should be one level higher than that of the recycled concrete used in the prefabricated components; the concrete is poured to a distance of 300 from the top surface of the pipe -500mm, and the concrete surface should be roughened.

After the shear wall components are installed in place and the post-cast concrete reaches the design strength, erect the beams and slabs on the prefabricated girders or plate brackets 8 of the wall; The beam and slab erection work is carried out directly on top of the wall.

Claims (9)

1. steel pipe built in a kind of assembled and GFRP pipe regeneration concrete compound shear walls, including steel bar stress, built-in pipe and Wrap up the concrete that they form precast wall body, it is characterised in that：The built-in pipe includes built-in steel pipe and built-in GFRP pipes, mixes Solidifying soil is regeneration concrete.

2. steel pipe built in assembled according to claim 1 and GFRP pipe regeneration concrete compound shear walls, its feature exist In：When the precast wall body thickness is less than 500mm, precast wall body along short transverse according to 2 times of floor heights split it is prefabricated and The side of wall sets corbel or plate support；When the precast wall body thickness is more than 500mm, precast wall body is along short transverse according to 1 times Floor height split prefabricated.

3. steel pipe built in assembled according to claim 2 and GFRP pipe regeneration concrete compound shear walls, its feature exist In：The built-in outer wall of steel pipe lays Welded-Stud Conectors, and welding of peg sets GFRP shearing resistances to connect in tube wall, built-in GFRP pipe outer walls Fitting.

4. steel pipe built in assembled according to claim 3 and GFRP pipe regeneration concrete compound shear walls, its feature exist In：The built-in pipe is arranged in parallel along precast wall body width, steel pipe built in the arrangement of precast wall body width both ends, adjacent built-in The center spacing of pipe is 2D-5D, and D is the external diameter of external diameter smaller in built-in steel pipe and built-in GFRP pipes.

5. steel pipe built in assembled according to claim 4 and GFRP pipe regeneration concrete compound shear walls, its feature exist In：The steel bar stress includes vertical reinforcement and horizontal distribution reinforcing bar, and the spacing of vertical reinforcement and horizontal distribution reinforcing bar should not be big In 300mm, steel tie should be set, between steel tie distribution between the reinforced mesh of vertical reinforcement and horizontal distribution reinforcing bar composition Away from for 100-200mm.

6. steel pipe built in assembled according to claim 5 and GFRP pipe regeneration concrete compound shear walls, its feature exist In：The built-in steel pipe, built-in GFRP pipes, vertical reinforcement, horizontal distribution reinforcing bar are stretched out outside precast wall body；The precast wall body Width both ends set U-shaped splicing groove along short transverse, are evenly arranged U-shaped tension rib in groove, the diameter of U-shaped steel tie is not less than 12mm and it is secondary enter wall in length meet that anchoring requires, the spacing of U-shaped steel tie not should be greater than between horizontal distribution reinforcing bar Away from.

7. steel pipe built in assembled according to claim 6 and GFRP pipe regeneration concrete compound shear walls, its feature exist In：Regeneration concrete concrete waste material as caused by production prefabricated components is process, and its intensity is not less than C40.

8. the construction party of steel pipe built in assembled according to claim 7 and GFRP pipe regeneration concrete compound shear walls Method, it is characterised in that operation is carried out as follows：

<1>In the horizontal direction, by the level of steel pipe built in two panels assembled and GFRP pipe regeneration concrete combined shear wall members Distribution bar connects, and the U-shaped tension rib in the U-shaped splicing groove of adjacent two panels shear wall is interlaced, and the cloth in intersecting area Put and be no less than 2 vertical joint bars；

<2>In short transverse, steel pipe built in two panels assembled and GFRP pipe regeneration concrete combined shear wall members are entering luggage During with construction, the built-in steel pipe in upper and lower two panels shear wall and built-in GFRP pipes are attached positioning first；Meanwhile upper and lower two Vertical reinforcement in piece shear wall is reliably connected；When precast shear wall component is located at structure bottom, wall joint it is vertical Reinforcing bar and tubing reinforcing bar pre-buried with the basis of and tubing are reliably connected；

<3>When steel pipe built in assembled and GFRP pipe regeneration concrete compound shear walls are connected with newel post, the water of wall is stretched out Flat distribution bar is reliably connected with default level in newel post to steel tie；

<4>After steel pipe, bar connecting, supporting module and poured at wall and wall, wall and newel post, wall and basic joints Concrete；

<5>The casting concrete inside the built-in tubing of steel pipe built in assembled and GFRP pipe regeneration concrete compound shear walls.

9. the construction party of steel pipe built in assembled according to claim 8 and GFRP pipe regeneration concrete compound shear walls Method, it is characterised in that step<4>And step<5>In the strength grade of concrete that pours than prefabricated components used by regenerate coagulation Native strength grade improves one-level.