CN105019606A - Precast concrete unit steel bar grouting connecting piece and connecting method - Google Patents

Abstract

The invention discloses a prefabricated concrete member steel bar grouting connector and a connecting method, the connector includes a metal sleeve used to connect two steel bars, two sealing rings and grouting formed by grouting material poured into the metal sleeve structure, the metal sleeve is in the shape of a fish belly; the two steel bars are the first steel bar inserted into the metal sleeve from top to bottom and arranged in the first prefabricated concrete member to be constructed, and the first steel bar inserted into the metal sleeve from bottom to top and arranged in the The second steel bar in the second prefabricated concrete member is constructed and formed; the metal sleeve is provided with vent holes and grouting holes; the connection method includes steps: 1. Installing the first steel bar and the metal sleeve; 2. Exhaust pipe and grouting Pipe installation; 3. Concrete pouring of the first precast concrete component; 4. Hoisting of the first precast concrete component and insertion of the second steel bar; 5. Grouting; 6. Maintenance. The invention is reasonable in design, convenient in realization and good in use effect, can simply and quickly complete the steel bar connection process and is reliable in connection.

Description

A prefabricated concrete component reinforcement grouting connector and connecting method

technical field

The invention belongs to the technical field of prefabricated concrete component construction, and in particular relates to a prefabricated concrete component reinforcement grouting connector and a connection method.

Background technique

The development of construction industrialization is the fundamental transformation of the construction production mode from extensive production to intensive production, and it is the inevitable way and development direction of industrial modernization. The use of prefabricated concrete structures is an effective way to realize the industrialization of buildings. It is a concrete structure made of prefabricated concrete components as the main component, which is assembled, connected and partially cast in place. Foreign concrete prefabricated components and reinforced concrete started almost at the same time, but industrialized prefabricated concrete components in the modern sense were not really developed until half a century ago.

The steel bar connection methods used in the existing prefabricated concrete structures mainly include sleeve grouting connection and restraint grout-anchor connection. In actual use, the above two connection methods have their own advantages and disadvantages. Among them, the main advantage of the sleeve grouting connection method is that the connection is reliable. However, due to the small size of the connection part of the prefabricated concrete structure, the currently used connection sleeve has a large size and a complicated internal structure. Not only the processing cost is high, The process is complex, the demand for steel is large, and the connection of steel bars is difficult, inconvenient, labor-intensive and time-consuming; the main advantage of the restrained slurry-anchor connection method is low cost, but the manufacturing process is complicated, and the length of the steel bar lap is very long, wasting steel bars And it is not conducive to construction. In addition, there is no uniform, standardized and specific construction method to follow when using the sleeve connection method to connect steel bars at present. In actual construction, there are inevitably random, irregular, cumbersome construction operations, low construction workers, and poor connection. issues such as poor quality.

Contents of the invention

The technical problem to be solved by the present invention is to provide a steel grouting connector for prefabricated concrete members in view of the deficiencies in the above-mentioned prior art. The steel bar connection process of precast concrete components is completed and the connection is reliable.

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a prefabricated concrete member steel bar grouting connector, which is characterized in that: it includes a metal sleeve for connecting two steel bars, and two metal sleeves respectively arranged on the upper and lower ends of the metal sleeve. The sealing ring and the grouting structure formed by the grouting material poured into the cavity between the metal sleeve and the two steel bars, the metal sleeve is a fish belly-shaped connecting sleeve, and the two steel bars pass through the grouting structure It is tightly connected with the metal sleeve; the two steel bars are respectively the first steel bar inserted into the metal sleeve from top to bottom and the second steel bar inserted into the metal sleeve from bottom to top. The upper end is provided with an upper steel bar socket for the first steel bar to be inserted and the lower end is opened with a lower steel bar socket for the second steel bar to be inserted into; the two sealing rings are respectively an upper sealing ring and a pair The lower sealing ring for sealing the lower steel bar socket, the interference fit between the upper steel bar socket and the upper sealing ring and the lower steel bar socket and the lower sealing ring; the upper sealing ring is set in the on a steel bar, and the upper seal ring has a through hole for the first steel bar to penetrate; the lower seal ring is set on the second steel bar, and the lower seal ring has a through hole for the second steel bar to penetrate, The diameters of the first steel bar and the second steel bar are the same; the cross-section of the metal sleeve is circular and the middle diameter is the largest, and the middle outer diameter D1 of the metal sleeve is ≥ 2.5d+20mm and the upper and lower ends of the metal sleeve are Outer diameter D2≥2.5d+10mm, where d is the diameter of the first steel bar; the overlapping length L of the first steel bar and the second steel bar is >8d; an air vent is opened on the upper part of the side wall of the metal sleeve And a grouting hole is opened at the lower part of the side wall.

The above-mentioned prefabricated concrete component reinforcement grouting connector is characterized in that: the metal sleeve is a ductile iron cylinder.

The above-mentioned prefabricated concrete component reinforcement grouting connector is characterized in that: the 28-day compressive strength of the grouting structure is not less than 85MPa.

The above-mentioned prefabricated concrete member steel bar grouting connector is characterized in that: the distance between the bottom end of the first steel bar and the top surface of the lower sealing ring and the distance between the top end of the second steel bar and the bottom surface of the upper sealing ring are both 5 mm to 10 mm; Both the upper sealing ring and the lower sealing ring are rubber sealing rings; the wall thickness of the metal sleeve is 3mm-5mm; the thickness of the upper sealing ring and the lower sealing ring are both 6mm-10mm.

The above-mentioned prefabricated concrete member steel bar grouting connector is characterized in that: the two steel bars are arranged in parallel and both of them are arranged in parallel with the metal sleeve.

The above-mentioned prefabricated concrete member steel bar grouting connector is characterized in that: the distance D3 between the two steel bars is 0.4d-0.6d.

The above-mentioned prefabricated concrete member steel bar grouting connector is characterized in that: the exhaust hole is equipped with an exhaust pipe, the grouting hole is equipped with a grouting pipe, and the exhaust pipe and the grouting pipe are perpendicular to the metal sleeve Layout and both are PVC pipes.

At the same time, the invention also discloses a prefabricated concrete component steel bar grouting connection method with simple steps, reasonable design, convenient implementation, high connection efficiency and good connection effect, which is characterized in that: among the two steel bars to be connected, the first steel bar The steel bar to be connected is arranged in the first prefabricated concrete member to be constructed, the second steel bar is a pre-embedded steel bar arranged in the second precast concrete member that has been constructed, and the upper end of the second steel bar extends to The outer side of the second prefabricated concrete member; the exhaust pipe is equipped with the vent hole, and the grout pipe is equipped with the grout hole, and the exhaust pipe and the grout pipe are arranged vertically with the metal sleeve; for the two steel bars When making a connection, the following steps are involved:

Step 1. Installation of the first steel bar and the metal sleeve: before pouring the first precast concrete member, install the first steel bar on the first precast concrete member according to the layout position of the first precast concrete member for construction. A prefabricated concrete member forming template; after that, insert the lower end of the first steel bar into the metal sleeve, and seal the upper steel bar socket through the upper sealing ring;

Step 2, installation of exhaust pipe and grouting pipe: the exhaust pipe and grouting pipe installed on the metal sleeve described in step 1; the outer ends of the exhaust pipe and the grouting pipe protrude to the outside of the forming template , the inner end of the exhaust pipe is installed on the exhaust hole opened on the metal sleeve, the inner end of the grouting pipe is installed on the grouting hole opened on the metal sleeve, and the forming template is provided with a supply and exhaust pipe and pipe mounting holes for grouting pipe installation;

Step 3. Concrete pouring of the first prefabricated concrete member: using the formwork described in step 1 to pour concrete on the first prefabricated concrete member to obtain the first prefabricated concrete member formed by construction; the first steel bar and the metal sleeve are both pouring into the first precast concrete element;

Step 4. Hoisting of the first precast concrete element and insertion of the second steel bar: hoisting the first precast concrete element formed in step 3 above the second precast concrete element with hoisting equipment, and lowering the first precast concrete element, making the second pre-embedded steel bar in the second prefabricated concrete member inserted into the metal sleeve from bottom to top, and sealing the lower steel bar socket through the lower sealing ring;

Step 5. Grouting: Open the exhaust pipe and grouting pipe, and continuously pour grouting material into the metal sleeve through the grouting pipe; when the grouting material is discharged from the exhausting pipe, block the exhausting pipe; wait until the grouting material is full of metal When the sleeve is inside, stop pouring the grouting material to obtain the grouting structure;

Step 6. Maintenance: The grouting structure described in step 5 is maintained. After the maintenance is completed, the connection process of the two steel bars is completed.

The above method is characterized in that: when the grouting structure is maintained in step 6, the curing period is not less than 28 days, and the 28-day compressive strength of the grouting structure is not less than 85 MPa.

The above method is characterized in that: the bottom surface of the first prefabricated concrete member (3) described in step 3 is flush with the bottom surface of the metal sleeve; when the first prefabricated concrete member is hoisted and the second steel bar is inserted in step 4, After the concrete poured in step 3 is finally set, the first precast concrete member is hoisted by the hoisting equipment; after the exhaust pipe and grouting pipe described in step 2 are installed, the exhaust pipe and grouting pipe need to The outer ends are sealed separately.

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

1. The steel grouting connectors adopted are simple in structure, reasonable in design and low in investment cost.

2. The steel grouting connectors used are easy to process and manufacture, have small dimensions and occupy little space.

3. It is easy to use and operate, convenient to construct, and the steel bar connection method adopted is simple in steps, reasonable in design, convenient in realization, high in connection efficiency, and good in connection effect. The fish-bellied metal sleeve is used to form holes in the first precast concrete member, It can also play the role of restraining grouting material. Compared with the restrained grout anchor connection, the process of forming holes and configuring restraint stirrups is omitted, and the connection can be completed by inserting the two steel bars to be connected into the metal sleeve for grouting. At the same time, since the metal sleeve is in the shape of a fish belly, and the relative axial force is generated between the micro-expanded grouting material and the inner wall of the metal sleeve, radial contraction pressure is generated on the grouting material, so that the micro-expanded grouting material is more tightly Tightening the steel bars to be connected greatly increases the connection strength of the steel bars to be connected, thereby increasing the tensile strength of the connection.

In addition, the connection interface is safe and reliable. The metal sleeve is made of ductile iron and its shape is designed as a fish-belly shape with a large middle and small ends, forming a shear bond. The outer wall of the metal sleeve and the concrete outside the tube and the inside of the metal sleeve The interface between the grouting material and the inner wall of the metal sleeve is not prone to interface damage, and the interface connection is reliable.

4. Good use effect and high practical value, economical and practical, can easily and quickly complete the steel bar connection process and the connection is reliable, can easily realize the fast connection between steel bars, and the centering accuracy of the steel bars is low, easy to operate and labor-saving , the construction efficiency is high, the connection strength is reliable, and it has good economic benefits. At the same time, by limiting the structure and size of each part of the metal sleeve, coupled with the reasonable design of the connection method steps, the overall size is small, the space occupied is small, the material is saved, the construction process is simple, and the connection quality is reliable. Under the condition that the performance and quality stability of the steel bar connection meet the relevant technical regulations, the economic and technical indicators of the present invention greatly exceed that of the existing cement grouting steel bar joint. Compared with the ordinary sleeve grouting connection, since the steel bars connected by the ordinary sleeve grouting are butted, in the present invention, the two connecting steel bars are overlapped, and the anchorage areas of the two connecting steel bars overlap, thus further reducing the metal sleeve The size reduces the cost of the metal sleeve. In addition, when adopting the present invention to carry out steel bar connection construction, there is no need for complicated mechanical equipment and tools, nor does it require power consumption. To sum up, the present invention combines the advantages of the sleeve grouting connection and the restrained grout-anchor connection of two steel bar connection methods, the connection is safe and reliable, the processing and construction are simple and easy, and the overall cost performance is high.

5. It has a wide range of applications and broad prospects for promotion and application, and can be applied to the connection of steel bars in prefabricated concrete components such as beams, columns and walls.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the use state of the steel bar grouting connector of the present invention.

Fig. 2 is a sectional view along A-A of Fig. 1 .

Fig. 3 is a flow chart of the method when the present invention is used to connect steel bars.

Explanation of reference signs:

1—upper sealing ring; 2—exhaust pipe; 3—the first prefabricated concrete component;

4—the second steel bar; 5—the grouting pipe; 6—the second precast concrete component;

7—the first steel bar; 8—metal sleeve; 9—grouting structure;

10—lower sealing ring.

Detailed ways

As shown in Figure 1 and Figure 2, a prefabricated concrete component steel grouting connector, including a metal sleeve 8 for connecting two steel bars, two sealing rings arranged on the upper and lower ends of the metal sleeve 8 The grouting structure 9 formed by the grouting material in the cavity between the sleeve 8 and the two steel bars, the metal sleeve 8 is a fish belly-shaped connecting sleeve, and the two steel bars pass through the grouting structure 9 and the metal sleeve The cylinder 8 is tightly connected as a whole. The two steel bars are respectively the first steel bar 7 inserted into the metal sleeve 8 from top to bottom and the second steel bar 4 inserted into the metal sleeve 8 from bottom to top. The upper end of the metal sleeve 8 is provided with a A steel bar 7 is inserted into the upper steel bar socket and its lower end has a lower steel bar socket for the second steel bar 4 to insert. The two sealing rings are respectively an upper sealing ring 1 that blocks the upper steel bar socket and a lower sealing ring 10 that blocks the lower steel bar socket, and a gap between the upper steel bar socket and the upper sealing ring 1 And between the lower reinforcing bar socket and the lower sealing ring 10 are interference fits. The upper seal ring 1 is set on the first steel bar 7, and the upper seal ring 1 has a through hole for the first steel bar 7 to penetrate; the lower seal ring 10 is set on the second steel bar 4, and the lower seal The ring 10 is provided with a through hole for the second steel bar 4 to pass through, and the diameters of the first steel bar 7 and the second steel bar 4 are the same. The cross section of the metal sleeve 8 is circular with the largest diameter in the middle, the outer diameter D1 of the middle part of the metal sleeve 8 is ≥ 2.5d+20mm and the outer diameter D2 of the upper and lower ends is ≥ 2.5d+10mm, where d is the diameter of the first steel bar 7. The overlapping length L of the first steel bar 7 and the second steel bar 4>8d. The upper part of the side wall of the metal sleeve 8 is provided with a vent hole and the lower part of the side wall is provided with a grouting hole.

In this embodiment, the outer diameter D1 of the middle part of the metal sleeve 8 = 2.5d + 20mm and the outer diameter D2 of the upper and lower ends thereof = 2.5d + 10mm.

During actual construction, the values of the outer diameter D1 in the middle and the outer diameter D2 at the upper and lower ends of the metal sleeve 8 can be adjusted accordingly according to specific needs.

In this embodiment, the metal sleeve 8 is a ductile iron sleeve.

In actual use, the metal sleeve 8 can also be a sleeve made of other materials, such as a stainless steel sleeve.

During actual construction, the distance between the bottom of the first steel bar 7 and the top surface of the lower sealing ring 10 and between the top of the second steel bar 4 and the bottom surface of the upper sealing ring 1 is 5 mm to 10 mm; The lower sealing ring 10 is a rubber sealing ring; the wall thickness of the metal sleeve 8 is 3mm-5mm; the thickness of the upper sealing ring 1 and the lower sealing ring 10 is 6mm-10mm. The through holes provided on the upper sealing ring 1 for the first steel bars 7 to penetrate and the through holes provided on the lower sealing ring 10 for the second steel bars 4 to penetrate are arranged in a staggered manner.

In this embodiment, the two steel bars are arranged in parallel and both are arranged in parallel with the metal sleeve 8 .

Moreover, the distance D3 between the two steel bars is 0.4d˜0.6d.

In this embodiment, the distance D3 between the two steel bars is 0.5d.

During actual construction, the value of D3 can be adjusted accordingly according to specific needs.

In this embodiment, an exhaust pipe 2 is installed on the exhaust hole, and a grouting pipe 5 is installed on the grouting hole. Both the exhaust pipe 2 and the grouting pipe 5 are vertically arranged with the metal sleeve 8 and both For PVC pipes.

In this embodiment, the air vent is located directly above the grouting hole.

Moreover, the exhaust pipe 2 and the grouting pipe 5 are arranged in parallel.

In this embodiment, the grouting material poured into the cavity between the metal sleeve 8 and the two steel bars is a high-strength non-shrinking cement-based grouting material.

The high-strength non-shrinkage cement-based grouting material is a dry-mixed material composed of cement as the base material, adding natural high-strength aggregates, concrete admixtures, etc. in an appropriate amount. After adding water and mixing, it has high fluidity, early strength, high strength, and slight expansion. and other characteristics.

In actual use, since the metal sleeve 8 has a fish-belly shape with a large middle and small ends, no stirrups need to be provided on the outer side for reinforcement.

A kind of prefabricated concrete member steel bar grouting connection method as shown in Figure 3, among the two steel bars that need to be connected, the first steel bar 7 is the steel bar to be connected that is arranged in the first precast concrete member 3 to be constructed, and the second The steel bars 4 are pre-embedded steel bars arranged in the second prefabricated concrete member 6 that has been constructed, and the upper end of the second steel bar 4 protrudes to the outside of the second prefabricated concrete member 6; the exhaust hole is equipped with an exhaust pipe 2. The grouting hole is equipped with a grouting pipe 5, and the exhaust pipe 2 and the grouting pipe 5 are arranged vertically with the metal sleeve 8; When making a connection, the following steps are involved:

Step 1. Installation of the first steel bar and the metal sleeve: before pouring concrete on the first precast concrete member 3, install the first steel bar 7 on the pre-designed layout position of the first precast concrete member 3 It is used to construct the forming template of the first prefabricated concrete member 3; after that, the lower end of the first steel bar 7 is inserted into the metal sleeve 8, and the upper steel bar socket is blocked by the upper sealing ring 1;

Step 2, installation of exhaust pipe and grouting pipe: the exhaust pipe 2 and the grouting pipe 5 installed on the metal sleeve 8 described in step 1; the outer ends of the exhaust pipe 2 and the grouting pipe 5 all extend to Outside the forming template, the inner end of the exhaust pipe 2 is installed on the exhaust hole provided on the metal sleeve 8, and the inner end of the grouting pipe 5 is installed on the grouting hole provided on the metal sleeve 8. The forming template is provided with pipe installation holes for the installation of the exhaust pipe 2 and the grouting pipe 5;

Step 3. Concrete pouring of the first prefabricated concrete member: use the formwork described in step 1 to pour concrete on the first prefabricated concrete member 3 to obtain the first prefabricated concrete member 3 formed by construction; the first steel bar 7 and the metal The sleeves 8 are poured in the first prefabricated concrete member 3;

Step 4. Hoisting of the first precast concrete element and insertion of the second steel bar: hoist the first precast concrete element 3 formed in step 3 above the second precast concrete element 6 by using hoisting equipment, and install the first precast concrete element 3 Carrying out lowering, so that the second steel bar 4 pre-embedded in the second prefabricated concrete member 6 is inserted into the metal sleeve 8 from bottom to top, and the lower steel bar socket is blocked by the lower sealing ring 10;

Step 5, grouting: open the exhaust pipe 2 and the grouting pipe 5, and continuously pour the grouting material into the metal sleeve 8 through the grouting pipe 5; when the grouting material in the exhaust pipe 2 is discharged, seal the exhaust pipe 2 Blocking; when the grouting material fills the inside of the metal sleeve 8, stop pouring the grouting material to obtain the grouting structure 9;

Step 6. Maintenance: Carry out maintenance on the grouting structure 9 described in step 5. After the maintenance is completed, complete the connection process of the two steel bars.

In this embodiment, when the grouting structure 9 is maintained in step 6, the curing period is not less than 28 days, and the 28-day compressive strength of the grouting structure 9 is not less than 85 MPa and its 24h and 3h expansion The rate difference is 0.02% to 0.5%.

In this embodiment, the bottom surface of the first precast concrete member 3 described in step three is flush with the bottom surface of the metal sleeve 8; in step four, when the first precast concrete member is hoisted and the second steel bar is inserted, wait until step three After the poured concrete is finally set, the first prefabricated concrete member 3 is hoisted by the hoisting equipment; after the exhaust pipe 2 and the grouting pipe 5 described in step 2 are installed, the exhaust pipe 2 and the grouting The outer ends of the tubes 5 are respectively plugged.

Moreover, when the outer ends of the exhaust pipe 2 and the grouting pipe 5 are blocked, rubber sealing rings are used for sealing.

It can be seen from the above that during actual construction, the first steel bar 7 and the metal sleeve 8 are first placed at the corresponding installation positions in the forming template, and the lower end of the first steel bar 7 is inserted into the metal sleeve 8; after that, Blocking the outer ends of the upper steel bar socket and the exhaust pipe 2 and the grouting pipe 5 respectively, and then pouring concrete to the first precast concrete member 3, so that the metal sleeve 8 is poured in the first precast concrete member 3; After the concrete of the poured first precast concrete member 3 is finally set, the first precast concrete member 3 is hoisted, and the second steel bar 4 pre-embedded in the second precast concrete member 6 is inserted into the metal sleeve 8 from bottom to top , and then block the socket of the lower steel bar; then, carry out pressure grouting through the grouting pipe 5, specifically pour grouting material into the metal sleeve 8 continuously, and perform maintenance after the grouting is completed, that is, complete the connecting process of the steel bar.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.

Claims (10)

1. A prefabricated concrete member reinforcement grouting connector, is characterized in that: comprise the metal sleeve (8) that is used to connect two reinforcing bars, two sealing rings that are respectively arranged at the upper and lower ends of the metal sleeve (8) and are poured into The grouting structure (9) formed by the grouting material in the cavity between the metal sleeve (8) and the two steel bars, the metal sleeve (8) is a fish belly-shaped connecting sleeve, and the two steel bars The grouting structure (9) is tightly connected with the metal sleeve (8) as a whole; the two steel bars are respectively the first steel bar (7) inserted into the metal sleeve (8) from top to bottom and the first steel bar (7) inserted from bottom to top. The second steel bar (4) in the metal sleeve (8), the upper end of the metal sleeve (8) has an upper steel bar socket for the first steel bar (7) to insert and its lower end has a second steel bar (4) ) inserted into the lower steel bar socket; the two sealing rings are respectively the upper sealing ring (1) for sealing the upper steel bar socket and the lower sealing ring (10) for blocking the lower steel bar socket. Both the above-mentioned upper steel bar socket and the upper sealing ring (1) and between the lower steel bar socket and the lower sealing ring (10) are interference fit; the upper sealing ring (1) is set on the first steel bar (7) and the upper sealing ring (1) has a through hole for the first steel bar (7) to penetrate; the lower sealing ring (10) is set on the second steel bar (4), and the lower sealing ring (10) There is a through hole for the second steel bar (4) to penetrate, the diameter of the first steel bar (7) and the second steel bar (4) are the same; the cross section of the metal sleeve (8) is circular and The middle diameter is the largest, the outer diameter D1 of the middle part of the metal sleeve (8) ≥ 2.5d+20mm and the outer diameter D2 ≥ 2.5d+10mm of the upper and lower ends of the metal sleeve (8), wherein d is the diameter of the first steel bar (7); The overlapping length L of the first reinforcing bar (7) and the second reinforcing bar (4) is > 8d; the upper part of the side wall of the metal sleeve (8) has a vent hole and the lower part of the side wall has a grouting hole . 2. A prefabricated concrete component steel bar grouting connector according to claim 1, characterized in that: the metal sleeve (8) is a ductile iron cylinder. 3. A prefabricated concrete element reinforcement grouting connector according to claim 1 or 2, characterized in that: the 28-day compressive strength of the grouting structure (9) is not less than 85 MPa. 4. A prefabricated concrete component steel grouting connector according to claim 1 or 2, characterized in that: between the bottom end of the first steel bar (7) and the top surface of the lower sealing ring (10) and the second steel bar (4) The distance between the top end and the bottom surface of the upper sealing ring (1) is 5 mm to 10 mm; both the upper sealing ring (1) and the lower sealing ring (10) are rubber sealing rings; the metal sleeve (8 ) has a wall thickness of 3 mm to 5 mm; the thicknesses of the upper sealing ring (1) and the lower sealing ring (10) are both 6 mm to 10 mm. 5. A prefabricated concrete component steel bar grouting connector according to claim 1 or 2, characterized in that: two said steel bars are arranged in parallel and both are arranged in parallel with the metal sleeve (8). 6. A prefabricated concrete component steel bar grouting connector according to claim 5, characterized in that: the distance D3 between the two steel bars is 0.4d-0.6d. 7. According to claim 1 or 2, a kind of prefabricated concrete component reinforcement grouting connector is characterized in that: said exhaust hole is equipped with exhaust pipe (2), and said grouting hole is equipped with grouting pipe (5) , the exhaust pipe (2) and the grouting pipe (5) are vertically arranged with the metal sleeve (8) and both are PVC pipes. 8. A method for connecting steel bars using a steel bar grouting connector as claimed in claim 1, characterized in that: among the two steel bars to be connected, the first steel bar (7) is laid on the first precast concrete to be constructed The steel bar to be connected in the member (3), the second steel bar (4) is a pre-embedded steel bar arranged in the second prefabricated concrete member (6) that has been constructed, and the upper end of the second steel bar (4) extends Out to the outside of the second prefabricated concrete member (6); the exhaust pipe (2) is installed on the vent hole, the grout pipe (5) is installed on the grout hole, and the exhaust pipe (2) and the grout pipe ( 5) are arranged vertically with the metal sleeve (8); when connecting the two steel bars, the following steps are included: Step 1. Installation of the first steel bar and the metal sleeve: Before pouring concrete on the first precast concrete member (3), according to the layout position of the first steel bar (7) designed in advance The first steel bar (7) is installed in the formwork used to construct the first prefabricated concrete member (3); after that, insert the lower end of the first steel bar (7) into the metal sleeve (8), and pass the upper seal Circle (1) seals the upper reinforcing bar socket; Step 2, installation of exhaust pipe and grouting pipe: the exhaust pipe (2) and grouting pipe (5) installed on the metal sleeve (8) described in step 1; the exhaust pipe (2) and grouting pipe The outer ends of (5) all protrude to the outside of the forming template, the inner ends of the exhaust pipes (2) are installed on the exhaust holes provided on the metal sleeve (8), and the inner ends of the grouting pipes (5) The end is installed on the grouting hole opened on the metal sleeve (8), and the pipe installation hole for the supply and exhaust pipe (2) and the grouting pipe (5) is installed on the forming template; Step 3. Concrete pouring of the first prefabricated concrete member: using the formwork described in step 1 to pour concrete on the first prefabricated concrete member (3) to obtain the first prefabricated concrete member (3) formed by construction; the first prefabricated concrete member (3) is obtained; Both the steel bar (7) and the metal sleeve (8) are poured in the first prefabricated concrete member (3); Step 4. Hoisting of the first precast concrete element and insertion of the second steel bar: hoist the first precast concrete element (3) constructed in step 3 above the second precast concrete element (6) with hoisting equipment, and place the first The prefabricated concrete member (3) is lowered so that the second steel bar (4) embedded in the second prefabricated concrete member (6) is inserted into the metal sleeve (8) from bottom to top, and the lower sealing ring (10) is used to seal the metal sleeve (8). The following reinforcement sockets are sealed; Step 5, grouting: open the exhaust pipe (2) and the grouting pipe (5), and continuously pour the grouting material into the metal sleeve (8) through the grouting pipe (5); when there is grouting material in the exhausting pipe (2) When discharging, the exhaust pipe (2) is blocked; when the grouting material fills the inside of the metal sleeve (8), stop pouring the grouting material to obtain the grouting structure (9); Step 6. Maintenance: Carry out maintenance on the grouting structure (9) described in step 5. After the maintenance is completed, complete the connection process of the two steel bars. 9. according to the described method of claim 8, it is characterized in that: when described grouting structure (9) is maintained in step 6, maintenance period is not less than 28 days, and the 28 days of described grouting structure (9) The compressive strength is not less than 85MPa. 10. according to the described method of claim 8 or 9, it is characterized in that: the bottom surface of the first prefabricated concrete element (3) described in the step 3 is flush with the bottom surface of the metal sleeve (8); When the first prefabricated concrete member is hoisted and the second steel bar is inserted, after the concrete poured in step 3 is finally set, the first prefabricated concrete member (3) is hoisted by the hoisting equipment; the exhaust pipe described in step 2 After (2) and the grouting pipe (5) are installed, the outer ends of the exhaust pipe (2) and the grouting pipe (5) need to be blocked respectively.