CN106930472B - Short sleeve grouting steel bar connecting joint - Google Patents

Abstract

The invention relates to a short sleeve grouting steel bar connecting joint, which comprises a ribbed connecting steel bar, a connecting sleeve, a cement-based grouting material and a pressure bearing ring. The cross section has a semicircular bearing ring with a wedge-shaped structure, the diameter of the end of the grouting connection cavity of the connecting sleeve is smaller than the diameter of the inner cavity of the grouting connection cavity, the wedge-shaped bearing ring and the reduced diameter hole at the end of the sleeve are when the steel bar is under tension. , the anchoring effect of the cement-based grouting material to the ribbed connecting steel bars in the joint is significantly improved, not only the length of the joint is effectively shortened, but also the original state of the external steel bar of the joint is maintained, and the construction is simple, fast and low in cost. The invention is used for corrosion resistance. When connecting steel bars and stainless steel bars, it can not only ensure that the joints and steel bars have the same corrosion resistance, but also ensure that the mechanical properties of the joints meet the requirements of relevant domestic and foreign standards for steel sleeve grouting connection joints.

Description

Short sleeve grouted steel bar connection joint

technical field

The invention relates to the technical field of building construction, in particular to a short-sleeve steel bar grouting connecting joint and a connecting sleeve and a pressure-bearing ring.

Background technique

With the development of my country's national economy, the construction of marine resources development and utilization is expanding. The development of the marine economy requires a large number of marine engineering infrastructure such as ports, cross-sea bridges, and island reef construction. In order to solve the problem of seawater corrosion to concrete structures in related buildings, stainless steel bars and corrosion-resistant steel bars will be widely used. If the connection of large-diameter steel bars is lap joint, the material consumption is too large and the cost is too high; it is difficult to ensure corrosion resistance and connection performance at the same time for welded connection; in the mechanical connection method, the straight thread connection needs to be mechanically processed. It will adversely affect the mechanical properties or corrosion resistance of the joint; the sleeve extrusion connection needs to be specially produced to have the same corrosion resistance as the steel base material, but also meet the extrusion deformation performance of the connection material, which is difficult and costly; sleeve grouting Connection is an effective way to solve the above problems.

Rebar sleeve grouting connection is a construction technology applied to prefabricated concrete structures. It inserts the connected ribbed steel bars into a metal connection sleeve, and then pours non-shrinking cement-based grouting material into the connection sleeve to fill the The gap between the sleeve and the steel bar, after the cement-based grouting material hardens, the steel bar is firmly anchored in the connecting sleeve to realize the connection of the two ribbed steel bars. In the decades since the first patent of sleeve grouting connection joint appeared in the United States in 1968, the application of precast concrete structures has become more and more extensive, and many new types of grouting joints have appeared. However, there are various sleeve grouting joints. Their respective shortcomings: Although the traditional sleeve grouting joint has a simple connection process, the grouting anchor length is long, and the material consumption of the sleeve and the grouting material is large. If it is applied to the connection of stainless steel bars or corrosion-resistant steel bars, the cost of the joint is very high; a "Rebar end thickened grouting joint" shortens the length of the sleeve, but requires special equipment for upsetting of the rebar. During processing, the damage to the surface of the high-strength rebar by the clamping die of the upsetting equipment may affect the connection strength of the rebar, and welding is used. The anchoring head needs to be continuously welded on the steel bar, and the welding heat input is large, which will affect the metal structure of the stainless steel bar or the corrosion-resistant steel bar and change its corrosion resistance. Therefore, the existing sleeve grouting connection technology is difficult to be directly applied to the connection of corrosion-resistant steel bars and stainless steel steel bars. For corrosion-resistant steel bars and stainless steel steel bars, it is necessary to avoid damage to the steel bars and affect the mechanical properties, and to avoid the large amount of welding heat input changing the corrosion resistance of steel bars. The problem of performance requires a new type of steel bar connection joint to meet the relevant requirements.

SUMMARY OF THE INVENTION

In order to solve the above problems, the purpose of the present invention is to: provide a short sleeve steel bar grouting connecting joint and its connecting sleeve and pressure-bearing ring, and connect the ribbed steel bars at both ends through the connecting sleeve and the cement-based grouting material. At the same time, a pressure-bearing ring is installed on the connecting steel bar of the joint, and the anchoring force of the cement grouting material to the steel bar is improved through the pressure-bearing ring, which effectively shortens the length of the joint, reduces the connection cost, and realizes that the joint has the same mechanics and corrosion resistance as the steel base material. performance.

For achieving the above object, the technical scheme adopted in the present invention is:

A short-sleeve grouting steel bar connecting joint comprises a ribbed connecting steel bar, a connecting sleeve, a cement-based grouting material, and a pressure-bearing ring; the connecting sleeve is provided with a grouting connecting cavity, and the side wall of the connecting sleeve is provided with a grouting connection cavity. There is a grouting hole connecting the inside and outside of the grouting connection cavity. The cement-based grouting material is poured into the grouting connection cavity. combine together to form a rebar joint,

At least a pair of plane or helical bearing rings are arranged between the end transverse ribs of the ribbed connecting bars, and the projection of the bearing rings on a plane perpendicular to the axis of the ribbed connecting bars is Two semicircular rings, the circumference and thickness of the semicircular rings are respectively larger than the circumference and height projected on the same plane of the transverse rib of the ribbed connecting steel bar, and the pressure-bearing rings are used in pairs, which are installed in On the two sides of the ribbed connecting steel bar separated by longitudinal ribs, the two pieces of the same pair of pressure rings are relatively staggered along the axis of the ribbed connecting steel bar by a distance not exceeding a rib spacing of the ribbed connecting steel bar;

The middle part of the inner ring of the pressure-bearing ring is attached to the base circle of the ribbed connecting steel bar, and the two ends of the inner ring of the pressure-bearing ring are attached to the base circle of the ribbed connecting steel bar or spanning across the adjacent transverse ribs of the ribbed connecting bars;

The longitudinal section of the pressure-bearing ring along its axis has a wedge-shaped structure at one end, and the wedge-shaped structure of the cross-section consists of a straight line on the inner ring of the pressure-bearing ring and a straight line or a curve on the outer ring of the pressure-bearing ring. composition, when the straight line or curve (11) on the cross section is a straight line, the included angle with the axis of the pressure bearing ring (4) is 15°-60°, or when the straight line or curve (11) is a curve , the angle between the tangent of the curve and the axis of the bearing ring (4) is 15°-60°;

Before the ribbed connecting steel bar is inserted into the connecting sleeve, the pressure ring is fixed on the ribbed connecting steel bar by local welding, and the tip of the wedge-shaped structure of the pressure bearing ring is located away from the end of the ribbed connecting steel bar. the position of the head, the large head end of the wedge-shaped structure of the pressure bearing ring is located near the end of the ribbed connecting steel bar;

The inner diameter at the port of the grouting connection cavity of the connection sleeve is 0mm-3mm larger than the diameter of the largest circumscribed cylindrical surface of the outer edge of the pressure-bearing ring on the inserted ribbed connecting steel bar. The inner diameter of each place is more than 5mm larger than the inner diameter of the port of the grouting connection cavity.

For the short sleeve grouting steel bar connection joint, the pressure bearing ring is made of a metal material with a tensile strength of not less than 540MPa.

In the short sleeve grouting steel bar connection joint, the connection sleeve includes a cylinder body and an end cover, and the end cover (14) is connected with the inner thread provided at the inner hole of the cylinder body through an external thread provided at one end. connected.

The short sleeve grouting steel bar connection joint is made of corrosion-resistant steel or stainless steel.

For the short sleeve grouting steel bar connection joint, the pressure bearing ring is made of corrosion-resistant steel or stainless steel.

In the short sleeve grouting steel bar connection joint, a sealing member is provided at the end orifice of the grouting cavity of the connection sleeve.

In the short sleeve grouting steel bar connection joint, a limit pin or screw is arranged in the middle of the connection sleeve.

Compared with the prior art, the advantages of the present invention adopting the above technical solutions are:

1) The joint of the present invention is provided with a wedge-shaped pressure bearing ring on the steel bar in the grouting sleeve, and the pressure bearing ring is embedded in the cement grouting material in the sleeve, so that the cement-based grouting with ribbed connecting steel bars is wrapped in the joint. 2) The diameter of the inner hole at the end of the connecting sleeve of the present invention is close to the maximum outer diameter of the ribbed connecting steel bar equipped with the bearing ring, while the grouting connecting the sleeve is connected everywhere in the cavity The inner diameter is more than 5mm larger than the inner diameter at the port of the grouting connection cavity, that is, a reduced diameter hole is set at the end of the sleeve, and the inner wall of the grouting connection cavity near the end of the connection sleeve also axially aligns the cement in the grouting connection cavity. The base grouting material plays a supporting role, so that the anchoring effect of the cement-based grouting material on the steel bar is improved. When the steel bar is under tension, the anchoring effect of the connecting sleeve of the present invention is longer than that of the traditional grouting sleeve, and the bearing capacity of the joint is improved; 3) The pressure-bearing ring of the present invention is arranged in the depth of the grouting connection cavity of the connecting sleeve In the vicinity of the end of the steel bar, the influence of the pressure-bearing ring on the external corrosive medium is reduced. Therefore, when the material of the connecting sleeve adopts the material with the same corrosion resistance or better corrosion resistance as the connected steel bar, the joint of the present invention has the same corrosion resistance or better corrosion resistance. The corrosion resistance can be equal to or even higher than that of the steel base material body; 4), the pressure-bearing ring of the present invention is connected to the steel bar by local welding, does not require large-volume, high-power welding equipment, and has high construction efficiency, so the present invention is suitable. Compared with the existing sleeve grouting connection joint, the joint connection cost is significantly reduced.

Through the above advantages, the invention overcomes the shortcomings of the prior art for connecting corrosion-resistant steel bars or stainless steel steel bars, the length of the joint can be significantly shortened compared with the traditional sleeve grouting steel bar connecting joint, and the original state of the ribbed connecting steel bar outside the joint is maintained to ensure the joint. It has the same or even better corrosion resistance than steel bars, and its mechanical properties can meet the requirements of relevant domestic and foreign standards for steel sleeve grouting connection joints. The connection is fast, the operation is simple, the construction is convenient, and the connection cost is low. The joint of the invention can not only be used in the connection of corrosion-resistant steel bars or stainless steel steel bars in the field of cast-in-place structure buildings, but also in the connection of ordinary steel bars in the field of ordinary concrete structures and the butt joints where the axis deviation is small and the steel bars cannot be rotated in the assembled concrete structure. The application of steel bar connection parts has good technical and economic benefits and promotion and application prospects.

The structure of the connecting sleeve and the pressure-bearing ring of the present invention shows unique advantages when applied to the joint of the present invention, and therefore also has good application value and promotion prospect.

Description of drawings

Figure 1a is a schematic structural diagram of a short sleeve grouting steel bar connection joint of the present invention;

Fig. 1b is an end view of the ribbed connecting steel bar with the bearing ring installed in Fig. 1a;

Figure 1c is a schematic structural diagram and a cross-sectional view of the spiral pressure bearing ring;

Figure 1d is a schematic structural diagram and a cross-sectional view of a plane pressure bearing ring;

Fig. 2 is the first embodiment of the present invention;

Fig. 3 is the second embodiment of the present invention;

FIG. 4 is a third embodiment of the present invention.

Description of reference numerals: 1-ribbed connecting steel bar; 2-cement-based grouting material; 3-connecting sleeve; 4-bearing ring; 5-grouting connection cavity; 6-grouting hole; 7-grouting connection cavity port; 8-longitudinal rib; 9-base circle; 10-transverse rib; 11- wedge-shaped outer ring straight line or curve; 12- wedge-shaped structure; 13- wedge-shaped structure on the inner ring; 14- screw cap; 15- cylinder ; 16 - seals; 17 - limit pins or screws.

Detailed ways

The present invention will be further described below with reference to the specific embodiments and accompanying drawings, and the advantages and characteristics of the present invention will become clearer with the description.

Figure 1a shows a schematic structural diagram of a short-sleeve grouting steel bar connecting joint and its connecting sleeve 3 and bearing ring 4, and Figure 1b is the end shaft of the ribbed connecting steel bar with the bearing ring 4 installed in Figure 1a From the view, it can be seen that the pressure bearing ring 4 is a pair of semi-circular rings, and the circumference and thickness of the semi-circular rings are respectively greater than the circumference and the projection of the transverse rib 10 of the ribbed connecting bar 1 on the same plane. Height, the pressure-bearing rings 4 are used in pairs, respectively installed on the two sides of the ribbed connecting steel bar 1 separated by the longitudinal ribs 8, and the two pieces of the same pair of pressure-bearing rings 4 are along the ribbed connecting steel bar 1 The relative staggered distance of the axes does not exceed one rib spacing of the ribbed connecting steel bar 1. The middle part of the inner ring of the pressure-bearing ring 4 is attached to the base circle 9 of the ribbed connecting steel bar 1. The pressure-bearing ring 4. Both ends of the inner ring are attached to the base circle 9 of the ribbed connecting steel bar 1 or spanned on the transverse rib 10 of the adjacent ribbed connecting steel bar 1;

Fig. 1c and Fig. 1d are respectively helical or flat semi-circular rings. The longitudinal section of the pressure-bearing ring 4 along its axis has a wedge-shaped structure 12 at one end, and the wedge-shaped structure 12 of the cross-section is formed by the pressure-bearing ring 4 The straight line 13 on the inner ring and the straight line or curve 11 on the outer ring of the pressure-bearing ring 4 are formed. When the straight line or curve 11 on the cross-section is a straight line, the included angle with the axis of the pressure-bearing ring 4 is 15°ˉ60°, or when the straight line or curve 11 is a curve, the angle between the tangent of the curve and the axis of the bearing ring 4 is 15°ˉ60°;

As shown in Figure 1, the inner diameter of the grouting connection cavity port 7 of the connection sleeve 3 is 0mm-3mm larger than the diameter of the maximum circumscribed cylindrical surface of the outer edge of the pressure-bearing ring 4 on the ribbed connecting steel bar 1 inserted at the end. The inner diameter of each part of the grouting connection cavity 5 of the connection sleeve 3 is larger than the inner diameter of the port 7 of the grouting connection cavity by more than 5 mm.

When the steel bar is stressed, the joint of the present invention is provided with a wedge-shaped bearing ring on the steel bar in the grouting sleeve. Capacity enhancement played an important role.

First: the perimeter and thickness of the two semi-circles projected by the pressure ring 4 on the plane perpendicular to the axis of the ribbed connecting steel bar 1 are respectively greater than the transverse ribs of the ribbed connecting steel bar 1 on the same plane The perimeter and height of the upper projection make the action area of the pressure-bearing ring 4 and the surrounding cement grouting material 2 much larger than the action area of the steel transverse rib 10, so that a larger force can be transmitted; The longitudinal section of its axis has a wedge-shaped structure at one end. The side of the end of the ribbed connecting steel bar 1 leans against the transverse rib 10 of the ribbed connecting steel bar 1. This structure enables the ribbed connecting steel bar 1 in the connecting sleeve to transmit the tensile force to the surrounding cement-based grouting through the transverse rib 10. Material 2, the angle between the tangent of the straight line or curve 11 of the outer ring of the wedge-shaped structure and the axis of the bearing ring 4 is 15°ˉ60°, and the force is decomposed into the axial force and radial force of the steel bar. The cement-based grouting material 2 not only bears shear stress, but also bears compressive stress in multiple directions, whereby the bearing capacity of the cement-based grouting material 2 wrapped with the ribbed connecting steel bar 1 in the joint is improved.

Secondly, the inner diameter of the grouting connection cavity port 7 of the connection sleeve 3 of the present invention is larger than the diameter of the maximum circumscribed cylindrical surface of the outer edge of the pressure ring on the ribbed connecting steel bar 1 inserted at the end by 0mm-3mm, that is, the grouting The hole diameter of the connection cavity port 7 is close to the maximum outer diameter of the pressure bearing ring 4, so that the grouting connection cavity 5 is connected to the inner walls of the two ends of the connection sleeve 3 to the cement-based grouting material in the grouting connection cavity 5 of the connection sleeve 4. 2 plays a supporting role, and the cement-based grouting material 2 significantly improves the anchoring effect of the connecting steel bars in the joint; and the inner diameter of the grouting connection cavity 5 of the connection sleeve 3 is 5mm larger than the inner diameter of the grouting connection cavity port 7. The above, then eliminates the traditional grouting joint that the transverse ribs of the steel bar are close to the inner wall of the sleeve, causing the cement-based grouting material 2 to be too thin to provide anchorage for the steel bar. The inner hole of the end of the sleeve 3 of the present invention The diameter is much smaller than that of the traditional sleeve grouting joint whose inner diameter of the sleeve is larger than the diameter of the steel bar by more than 10 mm. Therefore, the joint of the present invention can connect the sleeve even when the ribbed connecting steel bar 1 is subjected to a large tensile stress and large deformation occurs. 3. It can still support the cement-based grouting material 2 in the grouting connection cavity 5, so that the peeling and damage of the cement-based grouting material 2 can be reduced. Therefore, the structure of the connecting sleeve 3 of the present invention is better than the traditional grouting sleeve when the steel bar is under tension. The anchoring action remains longer, thus contributing to the increased load-carrying capacity of the joint.

Third, the pressure-bearing ring 4 of the present invention is arranged near the end of the steel bar deep in the grouting connection cavity 5 of the connecting sleeve, which reduces the influence of the pressure-bearing ring 4 on the external corrosive medium. The anchoring length of the steel bar of the traditional grouting sleeve reaches 8 times the diameter of the steel bar. The present invention can shorten the size of the joint, but the anchoring length of the joint will not be less than 3 times the diameter of the steel bar. It is extremely difficult to reach the vicinity of the pressure-bearing ring 4 through the hardened high-strength cement-based grouting material 2 with a thickness greater than the diameter of multiple steel bars, so the corrosive medium outside the joint connection sleeve 3 is difficult to damage the buried pressure-bearing ring 4 and The surface of the steel bar around it, so when the material of the connecting sleeve 3 is the same corrosion resistance or better corrosion resistance material as the steel bar to be connected, the corrosion resistance of the joint of the present invention can be equal to that of the steel base material. or even higher.

Fourth, the pressure-bearing ring 4 of the present invention is connected to the steel bar by local welding, the installation of the pressure-bearing ring 4 is simple, convenient, and high in work efficiency, and the connection speed of the ribbed connecting steel bar 1 is also improved. The bearing ring 4 is embedded in the cement-based grouting material 2 in the joint, and the force transmission between the bearing ring 4 and the steel bar mainly depends on the steel transverse rib 10 on which it is supported, and the shear resistance of the steel transverse rib 10 is much greater than that of the support bearing The bearing capacity of the cement-based grouting material 2 of ring 4, the deformation of the cement-based grouting material 2 under pressure is very small, and the ribbed connecting steel bar 1 is under tension. On the base circle 9, it is close to the side of the transverse rib 10 and transmits the tensile force of the steel bar to the surrounding cement-based grouting material 2, so it is not necessary to connect firmly with the steel bar, and the purpose of local welding is only to ensure the connection between the bearing ring 4 and the steel bar The force is greater than the various resistances encountered when the steel bar is inserted into the connecting sleeve 3, ensuring the smooth insertion of the ribbed connecting steel bar 1 with the pressure-bearing ring 4 installed, and the local welding of the pressure-bearing ring does not require large-volume, high-power welding Therefore, compared with the existing sleeve grouting connection joint, the joint connection cost of the present invention is significantly reduced.

Example 1

As shown in FIG. 2 , a schematic diagram of connecting vertical steel bars using the joint and connecting sleeve of the present invention.

First install the pressure-bearing ring 4, take the pressure-bearing ring 4 that matches the specifications of the steel bar and buckle it between the upper ribbed connecting steel bar 1 to be connected and the lower ribbed connecting steel bar 1 closest to the transverse rib 10 of the connecting end of the steel bar, respectively, The middle of the inner ring of the bearing ring 4 is respectively attached to the base circle 9 of the two ribbed connecting bars 1. If the shape of the bearing ring 4 is a spiral bearing ring 4 that is consistent with the angle between the transverse rib 10 of the steel bar and the axis of the steel bar , the two ends of the bearing ring 4 should also be attached to the base circle of the two ribbed connecting bars 1 respectively. If the shape of the bearing ring 4 is a flat bearing ring 4, the two ends of the bearing ring 4 can span The transverse rib 10 of the two ribbed connecting bars 1 is close to the tail of the longitudinal rib 8, the wedge-shaped structure 12 of the pressure-bearing ring 4 is close to the end of the ribbed connecting steel bar 1, and the pressure-bearing ring 4 is close to it. The side of the end of the installed ribbed connecting steel bar 1 leans against the transverse rib 10 of the ribbed connecting steel bar 1, and then the spot welding pressure ring 4 is used to approach the two ends of the longitudinal rib 8, and it is partially welded to the upper and lower ribbed connection. On the steel bar 1, until all the pressure-bearing rings 4 required by the design are welded and fixed in the specified position;

Then, insert the ribbed connecting steel bar 1 into the connecting sleeve 3, first fix the lower ribbed connecting steel bar 1 on which the pressure bearing ring 4 is fixed, and the seal 16 is wrapped around the lower ribbed connecting steel bar 1 and the distance from the end is the designed insertion depth Position the connecting sleeve 3 vertically, the lower ribbed connecting steel bar 1 and the pressure-bearing ring 4 enter the grouting connection cavity 5 through the grouting connection cavity port 7 under the connecting sleeve 3 until the connecting sleeve 3 is tightly sealed 16, and then insert the upper ribbed connecting steel bar 1 of the fixed bearing ring 4 into the grouting connecting cavity 5 through the upper grouting connecting cavity port 7 of the connecting sleeve 3, until the end of the upper ribbing connecting steel bar 1 is connected with the lower ribbing. On the end of steel bar 1, use stirrups or other fixing materials to fix the upper and lower ribbed connecting steel bars 1, and then install other connecting steel bars of this component in sequence according to the same steps above. After installation, use stirrups to grouting the sleeve. The connected ribbed connecting steel bars 1 and other steel bars are laterally pulled and connected to each other, and then the stirrups and each connecting steel bar are bundled and fastened with each other with thin iron wires;

Finally, according to the product requirements of the cement-based grouting material 2, prepare the cement-based grouting material 2 slurry, and use the grouting equipment to inject the cement-based grouting material 2 slurry from the lower grouting hole 6 until the cement-based grouting material 2 slurry. Flow out from the grouting hole 6 above the connecting sleeve 3, plug the upper grouting hole 6 with a sealing plug, until the cement-based grouting material 2 passes from the grouting connection cavity port 7 above the connecting sleeve 3 and the upper ribbed connecting steel bar 1 Then the grouting device is removed, and the grouting hole 6 under the connecting sleeve 3 is blocked with a sealing plug in time. The grouting connection of the ribbed connecting steel bar 1 is completed, and the other connecting sleeves are completed according to the same steps. The grouting of the cylinder 3 ensures that the steel bar and sleeve are not disturbed before the cement-based grouting material 2 solidifies and reaches the specified strength. The process of supporting formwork and pouring concrete.

Embodiment 2

As shown in FIG. 3 , a schematic diagram of applying the joint and connecting sleeve of the present invention to connect horizontal steel bars.

The connecting sleeve of the joint of the present invention is composed of a cylinder body 15 and an end cover 14, and a sealing member 16 is provided at the orifice at the end of the grouting cavity.

First, with the first step of the embodiment, take the pressure-bearing ring 4 that matches the steel bar specification, and fix the pressure-bearing ring 4 between the end transverse ribs 10 of the two connected ribbed connecting steel bars 1 as required;

Then, fix a ribbed connecting steel bar 1 horizontally, wrap the seal 16 around the fixed ribbed connecting steel bar 1 at a position that is the designed insertion depth from the end, and cover the grouting connection cavity port 7 of the connecting sleeve 3 laterally on the fixed ribbed connecting steel bar 1. The ribbed connecting steel bar 1 and the end of the pressure bearing ring 4, and then the ribbed connecting steel bar 1 and the pressure bearing ring 4 enter the grouting connection cavity 5 through the grouting connection cavity port 7 of the connecting sleeve 3 until the connecting sleeve 3 is tightly sealed Part 16 to reach the position required by the design; then a ribbed connecting steel bar 1 is also operated according to the side of the first steel bar, and the seal 16 is wrapped around the fixed ribbed connecting steel bar 1 at the position of the design insertion depth from the end, Put the ribbed connecting steel bar 1 and the pressure bearing ring 4 into the grouting connection cavity 5 through the grouting connection cavity port 7 of the connecting sleeve 3 until the connecting sleeve 3 abuts the seal 16 and reaches the position required by the design; Turn the grouting hole 6 to the upper position of the ribbed connecting steel bar 1 connected by this joint, and then install other connecting steel bars of this component in sequence according to the same steps. After installation, use stirrups to connect the ribbed connecting bars of the grouting sleeve. Reinforcing bar 1 and other reinforcing bars are laterally pulled and connected to each other, and then the stirrups and each connecting reinforcing bar are tied and fastened with each other with thin iron wires;

Finally, according to the product requirements of the cement-based grouting material 2, the cement-based grouting material 2 is prepared, and the cement-based grouting material 2 is injected through the grouting hole 6 at one end of the connecting sleeve 3 with grouting equipment until the cement-based grouting material is grouted. The slurry of the material 2 flows out from the grouting hole 6 at the other end of the connecting sleeve 3, and the grouting connection of the ribbed connecting steel bar 1 is completed, ensuring that the connecting sleeve 3 is no longer subject to collision or rotation, and then follow the same steps to complete other For the grouting of the connection sleeve 3, ensure that the steel bar and the sleeve are not disturbed before the cement-based grouting material 2 solidifies and reaches the specified strength. Then carry out the process of supporting the formwork and pouring the concrete.

Embodiment 3

As shown in FIG. 4 , it is a schematic diagram of applying the joint and connecting sleeve of the present invention to connect horizontal steel bars.

The operation of this embodiment is basically the same as that of the second embodiment, except that the sealing member 16 does not need to be wrapped on the ribbed connecting steel bar 1 first. Due to the positioning and limiting pins or screws 17 installed in the middle of the connecting sleeve 3, the ribbed connecting steel bars inserted at both ends 1. After entering the grouting connection cavity 5 of the connection sleeve 3, stop until it stops on the limit pin or screw. After the steel bars on both sides are inserted in place, transfer the grouting hole 6 of the connection sleeve 3 to this joint connection. The upper position of the ribbed connecting steel bar 1, and then wrap the seal 16 or other blocking material at the end orifice of the connecting sleeve 3, and finally, fix and grouting in the same steps as above. This is the grouting of the ribbed connecting steel bar 1 The connection is completed, to ensure that the connecting sleeve 3 is no longer subject to collision or rotation, and then follow the same steps to complete the grouting of other connecting sleeves 3. Before the cement-based grouting material 2 solidifies and reaches the specified strength, ensure that the steel bar and the sleeve are not damaged. After being disturbed, after the compressive strength of cement-based grouting material 2 meets the requirements, the steel bar connection of this component is all completed, and then the process of supporting the formwork and pouring concrete is carried out.

The above descriptions and examples are exemplary only and do not limit the scope of the present invention in any way. It should be understood by those skilled in the art that the details and forms of the technical solutions of the present invention can be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the protection scope of the present invention.

Claims (7)

1. A short sleeve grouting steel bar connecting joint, comprising a ribbed connecting steel bar (1), a connecting sleeve (3), a cement-based grouting material (2), and a pressure bearing ring (4); the connecting sleeve (3) ) is provided with a grouting connecting cavity (5), the side wall of the connecting sleeve (3) is provided with a grouting hole (6) that communicates the inside and outside of the grouting connecting cavity (5), and the grouting connecting cavity (5) The cement-based grouting material (2) is poured inside, and the cement-based grouting material (2) is combined with the connecting sleeve (3), the ribbed connecting steel bar (1) and the bearing ring (4) after solidification A rebar joint is formed, characterized by: At least a pair of plane or spiral bearing rings (4) are arranged between the end transverse ribs (10) of the ribbed connecting bars (1), and the bearing rings (4) are perpendicular to the The projection on the plane of the axis of the ribbed connecting steel bar (1) is two semicircular rings, and the perimeter and thickness of the semicircular rings are respectively greater than the transverse ribs (10) of the ribbed connecting steel bar (1) in the same direction. The perimeter and height projected on the plane, the pressure-bearing rings (4) are used in pairs, and are respectively installed on the two sides of the ribbed connecting steel bar (1) separated by the longitudinal ribs (8). The same pair of pressure-bearing rings The distance between the two pieces of (4) relative to each other along the axis of the ribbed connecting steel bar (1) does not exceed a rib spacing of the ribbed connecting steel bar (1); The middle part of the inner ring of the pressure bearing ring (4) is attached to the base circle (9) of the ribbed connecting steel bar (1), and the two ends of the inner ring of the pressure bearing ring (4) are attached to the base circle (9) of the ribbed connecting steel bar (1). on the base circle (9) of the ribbed connecting steel bar (1) or on the transverse rib (10) of the adjacent ribbed connecting steel bar (1); The longitudinal section of the pressure-bearing ring (4) along its axis has a wedge-shaped structure (12) at one end, and the wedge-shaped structure (12) of the cross-section is formed by a straight line (13) on the inner ring of the pressure-bearing ring (4). ) and the straight line or curve (11) on the outer ring of the pressure-bearing ring (4). The included angle is 15°-60°, or when the straight line or curve (11) is a curve, the included angle between the tangent of the curve and the axis of the bearing ring (4) is 15°-60°; Before the ribbed connecting steel bar (1) is inserted into the connecting sleeve (3), the pressure bearing ring (4) is fixed on the ribbed connecting steel bar (1) by partial welding, and the pressure bearing ring ( 4) The tip of the wedge-shaped structure (12) is located away from the end of the ribbed connecting steel bar (1), and the large end of the wedge-shaped structure (12) of the pressure bearing ring (4) is located close to the ribbed connecting steel bar ( 1) The position of the end; The inner diameter of the grouting connection cavity port (7) of the connection sleeve (3) is larger than the diameter of the maximum circumscribed cylindrical surface of the outer edge of the pressure-bearing ring (4) on the inserted ribbed connection steel bar (1). 0mm-3mm, the inner diameter of each part of the grouting connection cavity (5) of the connection sleeve (3) is larger than the inner diameter of the grouting connection cavity port (7) by more than 5mm. 2 . The short sleeve grouting steel bar connection joint according to claim 1 , wherein the pressure bearing ring ( 4 ) is made of a metal material with a tensile strength of not less than 540 MPa. 3 . 3. The short sleeve grouting steel bar connection joint according to claim 1, wherein the connection sleeve (3) comprises a cylinder (15) and an end cover (14), the end cover (14) passing through The external thread provided at one end is connected with the internal thread provided at the inner hole of the cylinder body (15). 4. The short sleeve grouting steel bar connection joint according to claim 1, characterized in that, the connection sleeve (3) is made of corrosion-resistant steel or stainless steel. 5 . The short sleeve grouting steel bar connection joint according to claim 1 , wherein the pressure bearing ring ( 4 ) is made of corrosion-resistant steel or stainless steel. 6 . 6. The short-sleeve grouting steel bar connection joint according to claim 1, characterized in that, a sealing member (16) is provided at the orifice at the end of the grouting cavity of the connection sleeve (3). 7. The short sleeve grouting steel bar connection joint according to claim 1, characterized in that, a limit pin or screw (17) is provided in the middle of the connection sleeve (3).

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