CN103899044A - Full-grouting sleeve embedded with cones - Google Patents

Abstract

The invention discloses a full grouting sleeve embedded with a cone. The sleeve comprises a sleeve body (3), a cone (7), a grouting port (4), a grouting port (5), a stop Bolts (9), rubber sealing rings (10), rubber sealing rings (10) are installed at both ends of the sleeve body (3); a cone (7) is respectively embedded inside the two ends of the sleeve body (3) , in order to prevent the cone (7) from sliding in the sleeve body, roll the parts of the sleeve body (3) corresponding to the two ends of the cone (7) to reduce the inner diameter of this part of the sleeve body (3); A grouting port (4) is provided on the outer wall of one end of the cylinder body (3), and a grouting port (5) is provided on the outer wall of the other end. The invention has the advantages of simple processing, low cost, etc., and is especially suitable for connecting steel bars in component beams, columns, and shear wall components, and can be widely used in assembled concrete structures, and has broad engineering application prospects.

Description

Fully grouted sleeve with built-in cone

technical field

The invention relates to a grout-anchored sleeve connector used for connecting steel bars between prefabricated concrete components, which belongs to the technical field of construction engineering, in particular to a fully grouted sleeve embedded with a cone.

Background technique

Prefabricated concrete structures, as a structural form in line with industrial production methods, have the advantages of fast construction speed, low labor intensity, less noise pollution and wet work, and easy control of product quality, and have been widely used in developed countries. The construction method of prefabricated assembly can effectively save resources and energy, improve the utilization rate of materials in realizing building energy saving and structural performance, overcome the restrictions of construction site and environmental conditions on site construction, reduce the number of on-site construction labor force, and reduce construction waste And the adverse impact of construction on the environment, improve building function and structural performance. The promotion of prefabricated concrete structures is conducive to realizing the green development requirements of "four sections and one environmental protection", realizing the construction process of low energy consumption and low emission, which can promote the healthy development of my country's construction industry and achieve the predetermined energy saving and emission reduction goals. It is the future of our country The direction of development of the building.

As we all know, the core and difficulty of prefabricated concrete structures is the connection of steel bars. The common forms of steel bar connection include mechanical connection, welding connection, lap connection, etc., but there is a problem that concrete needs to be poured at the connection node after the connection. The cement grouting sleeve connection can be embedded in the concrete parts in advance. The protruding steel bar of another part is inserted into the corresponding sleeve of this part, and then the non-shrinking high-strength cement mortar is poured into the connecting sleeve to fill the gap between the sleeve and the steel bar. After the cement mortar hardens, the two steel bars are They are firmly connected together, so as to achieve the purpose of connecting the steel bars at both ends. There is no need to pour concrete after pouring at the connection node, and the connection efficiency of the node is high.

At present, the relevant codes and regulations of prefabricated concrete structures promulgated in various parts of our country recommend the connection of steel bars to be connected by grouting sleeves. This is mainly because, compared with other connection methods, the grouting sleeve connection has the following advantages: ① mature technology; ② reliable connection. A large number of foreign engineering practices have proved that this connection method is simple and easy to operate, and the joint effect is good.

At present, according to the classification of the production process of the sleeve, the sleeve can be divided into two types: cast iron (steel) sleeve and machined sleeve. Foreign grouting sleeves for steel bar connection are generally ductile iron products. Domestic grouting sleeves are usually cast iron (steel) or machined. Machining is mainly made of steel rods or thick-walled steel pipes. The rod is hollowed out or the inner wall of the thick-walled steel pipe is milled into a predetermined form to form a grouting sleeve. The above two types of sleeves have their own disadvantages. The cast iron (steel) sleeve has a bulky appearance and high technical requirements; although the machined sleeve has relatively high strength, it is still relatively heavy, and the material consumption is large, and the production cost is high. Low production efficiency. It can be seen from the above that the above two kinds of sleeves all have disadvantages such as difficult processing, bulky form, and high cost.

Chinese patent document CN102071774A discloses a plug-in steel bar connecting sleeve and its construction method. The connecting sleeve has a tapered thread inside to play a shearing effect. The height of the tapered thread is small and the shearing effect is limited. Especially when this type of sleeve is used to connect steel bars with larger diameters, the disadvantage of poor shear resistance is more significant.

Chinese patent document CN102900201A discloses a slurry-anchored steel bar connecting sleeve and its manufacturing mold and manufacturing method. The connecting sleeve is extruded through a specific mold to form convex ribs and grooves inside the sleeve body , when the cement grout is poured inside the sleeve body, the convex ribs and grooves play the role of shear resistance. The shear resistance effect of this shear key is obvious, but the processing is more complicated, time-consuming and labor-intensive, and the processing cost is high.

Chinese patent document CN102116075A discloses a new type of cement grouting steel bar connecting joint. The connecting sleeve is a rolled section steel with a circular or polygonal shape, and the holes of the connecting sleeve are equal-diameter round holes, which are milled After the cement grouting material is poured inside the sleeve body, the raised ring rib connecting the inner wall of the sleeve and the ring at the hole end of the sleeve play a shearing role when the steel bar is stretched or compressed, and the shearing effect is obvious, but Sleeve processing is still relatively complicated, and the processing cost is high, which is not suitable for popularization and application in actual engineering.

To sum up, the existing sleeves have disadvantages such as complex processing technology, high material waste, and high processing costs, which are not conducive to the current development of housing industrialization and construction industrialization in my country. How to simplify the form of the sleeve and reduce the cost of the sleeve under the premise of ensuring the quality of the sleeve is the starting point of the present invention.

Contents of the invention

Technical problem: In order to overcome the deficiencies in the prior art, the present invention proposes a full-grouting sleeve embedded with a cone and a manufacturing method thereof that is easy to manufacture and low in processing cost.

Technical solution: In order to solve the above technical problems, the present invention proposes a full-grouting sleeve with a built-in cone, which is characterized in that the full-grout sleeve with a built-in cone includes a sleeve body, a built-in cone, and a grouting sleeve. mouth, slurry outlet, limit bolt, elastic rubber sealing ring, and elastic rubber sealing rings are installed at both ends of the sleeve body; a cone is respectively embedded in the two ends of the sleeve body; in order to prevent the cone from Sliding in the cylinder body, corresponding to the two ends of the cone body, the sleeve body is rolled to reduce the inner diameter of the sleeve body and fixed by welding; the outer wall of one end of the sleeve body is provided with a grouting port, and the other end of the sleeve body A slurry outlet is arranged on the outer wall.

A full grouting sleeve embedded with a cone-shaped body of the present invention includes a sleeve body, a cone-shaped body, a grouting port, a grouting port, a limit bolt, and a rubber sealing ring, and rubber sealing rings are installed at both ends of the sleeve body ; Two ends of the sleeve body are respectively embedded with a cone. In order to prevent the cone from sliding in the sleeve body, the parts of the sleeve body corresponding to the two ends of the cone body are rolled to reduce the size of this part of the sleeve body. Inner diameter; the outer wall of one end of the sleeve body is provided with a grouting port, and the outer wall of the other end is provided with a grouting port.

The minimum inner diameter of the embedded cone is slightly larger than the diameters of the bottom inserted steel bar and the upper inserted steel bar, and the sleeve body and the embedded cone are further fixed by welding.

The sleeve body is provided with 3 rows of screw holes, and the screw holes are provided with threads. The position interval of the 3 rows of screw holes on the circumference is 120 degrees, and the screw holes are screwed with shear bolts.

A screw hole is provided in the middle of the sleeve body, and a limit bolt is screwed on it to ensure that the steel bars on both sides have the same anchoring length.

The sleeve body should be a seamless steel pipe made of high-quality carbon structural steel, low-alloy high-strength steel or alloy structural steel.

The inner diameter of the rubber sealing ring is slightly smaller than the diameter of the bottom inserted steel bar and the upper inserted steel bar, and the outer diameter is slightly larger than the inner diameter of the sleeve, so that it has a sealing effect during grouting.

Beneficial effects: the full-grouting sleeve embedded with cones of the present invention is formed by using ordinary low-carbon steel seamless steel pipes as the material of the sleeve body and combining the embedded cones. On the one hand, the source of materials is extensive, and on the other hand, the processing is relatively simple, which can greatly reduce the production cost of the sleeve.

By setting shear bolts and embedded cones on the sleeve body, the inner diameter of the sleeve is gradually reduced to improve the restraint ability on the grouting material, greatly increasing the bonding strength between the grouting material and the steel bar, and reducing the sleeve The anchorage length of steel bars in the barrel reduces material costs.

The new sleeve has the advantages of wide material sources, simple processing and reliable performance, etc., which greatly improves the disadvantages of the current cast iron and cast steel sleeves, which are complicated to manufacture, high in cost, time-consuming and labor-intensive in mechanical milling sleeve processing, etc., and can be widely used in In the prefabricated concrete structure, it has broad engineering application prospects.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

In the figure: insert steel bar 1 at the bottom; insert steel bar 2 at the top; sleeve body 3; grout opening 4; grout outlet 5; cement grouting material 6; cone 7; shear bolt 8; limit bolt 9; rubber sealing ring 10; welding seam 11.

Detailed ways

The full-grouting sleeve with a built-in cone is embedded with a cone, so that the inner diameter of the sleeve shrinks along the direction of the hole. When the steel bar is under the action of tension, the cement grout inside the sleeve has an Sliding tendency, the cone inside the casing makes the grouting material in a triaxial stress state, thereby greatly enhancing the bonding force between the high-strength grouting material and the steel bar, and ensuring that the steel bar does not undergo bond-slip damage.

In order to prevent the embedded cone from being pulled out when the steel bar is stretched, the sleeve corresponding to the outer end of the cone is rolled to reduce the inner diameter of the sleeve, and the cone and sleeve are fixed by welding.

In order to ensure that the steel bar can be inserted into the sleeve, the minimum inner diameter of the embedded cone should be slightly larger than the diameter of the steel bar.

By setting the shear bolts on the sleeve body, it can replace the ring rib on the cast iron (steel) sleeve. Among them, it plays the role of a shear key, reasonably dispersing the tensile and compressive stress of the inserted steel bars inside the sleeve to the entire sleeve body, effectively avoiding local stress concentration on the sleeve body, and greatly improving the tensile capacity of the sleeve. Simultaneously, the form of the sleeve is simplified, the weight is reduced, and the cost is reduced.

As a preference, in order to improve the shear performance of the bolts, the shear bolts should preferably be high-strength bolts of grade 10.9 and above, and both inner hexagon bolts and outer hexagon bolts are acceptable.

The full grouting sleeve embedded with a cone is characterized in that the sleeve body is provided with 3 rows of screw holes, and the screw holes are provided with threads, and the position interval of the 3 rows of screw holes is 120 degrees. The holes are screwed with shear bolts.

The full grouting sleeve embedded with a cone is characterized in that a screw hole is provided in the middle of the sleeve body, and a limit bolt is screwed on it. When the sleeve is installed, due to the limit bolt, the sleeve The installation of the cylinder is more convenient, and the steel bars inserted on both sides are guaranteed to have the same anchoring length, which effectively avoids the problem of too long or too short insertion of the connecting steel bars.

The full-grouting sleeve with a built-in cone is characterized in that the sleeve body should be made of seamless steel pipes prepared from high-quality carbon structural steel, low-alloy high-strength steel, and alloy structural steel.

The full grouting sleeve embedded with a cone is characterized in that the inner diameter of the sealing rubber ring is smaller than the diameter of the steel bar, and the outer diameter is larger than the inner diameter of the sleeve, so as to ensure that the sleeve body has good sealing performance and avoid Leakage of grout during the process.

first step:

A full grouting sleeve embedded with a cone, comprising: a sleeve body 3, the sleeve body 3 is embedded with a cone 7, and the sleeve rolling treatment corresponding to the outer end of the cone reduces the inner diameter and adopts welding 11 connections, the sleeve body is provided with 3 rows of screw holes, the screw holes are provided with threads, the position interval of the 3 rows of screw holes is 120 degrees, the screw holes are screwed with shear bolts 8, and the middle part of the sleeve adopts The limit bolt 10 is positioned, and the sleeve body 3 is processed from a low-carbon steel seamless steel pipe.

Step two:

A full grouting sleeve embedded with a cone as described in the first step, preferably the inner diameter of the cone should be slightly larger than the diameter of the steel bar, and the cone should have a gentle slope. The inner diameter gradually shrinks outward. The cone should be fixed with the sleeve, and the inner diameter of the sleeve should be reduced by rolling and reinforced by welding.

third step:

A full grouting sleeve embedded with a cone as described in the first step, the shear bolts can be hexagon socket bolts or external hexagon bolts. As a preference, the shear bolts should preferably be grade 10.9 and For the above high-strength bolts, the length of the shear bolts extending into the sleeve should not be less than 1/4 and not exceeding 1/3 of the inner diameter of the sleeve, and the length of the limit bolts extending into the sleeve should not be less than 1/2 and not more than 1/3. The inner wall of the top pressure sleeve is suitable, and the number and diameter of the shear bolts shall be calculated and determined according to the type and diameter of the connecting steel bars.

the fourth step:

When using a full-grouting sleeve with a built-in cone described in steps 1, 2, and 3 for reinforcement connection, the sleeve body is pre-embedded in the first beam when the prefabricated components are poured, and the sleeve body can be used The outer concrete of the first beam is temporarily fixed. During on-site installation, the first beam is first fixed, and the second beam is hoisted. During the hoisting process, the second beam is continuously adjusted to make its steel bars inserted into the sleeve body reserved in the first beam. After the insertion is completed, fix the first beam, pour cement grout 6 from the grouting port 4 of the sleeve, stop the grouting after it flows out of the grouting port 5, and block the grouting port and the grouting port of the sleeve, In the same way, the connection of the remaining steel bars at the joints is completed, that is, the construction at the joints is completed.

Claims (6)

1. A full grouting sleeve embedded with a cone, characterized in that the sleeve includes a sleeve body (3), a cone (7), a grouting port (4), a grouting port (5), a limiter Position bolts (9), rubber sealing rings (10), rubber sealing rings (10) are installed at both ends of the sleeve body (3); a cone (7 ), in order to prevent the cone (7) from sliding in the sleeve body, roll the parts of the sleeve body (3) corresponding to both ends of the cone (7) to reduce the inner diameter of this part of the sleeve body (3); A grouting port (4) is provided on the outer wall of one end of the sleeve body (3), and a grouting port (5) is provided on the outer wall of the other end. 2. A full grouting sleeve with a built-in cone according to claim 1, characterized in that the minimum inner diameter of the built-in cone (7) is slightly larger than the bottom inserted reinforcement (1) and the upper inserted reinforcement (2 ), the sleeve body (3) and the embedded cone (7) are further fixed by welding. 3. A full grouting sleeve embedded with a cone according to claim 1, characterized in that the sleeve body (3) is provided with 3 rows of screw holes, the screw holes are provided with threads, and the 3 rows of screws The position intervals of the holes on the circumference are 120 degrees, and the screw holes are screwed with shear bolts (8). 4. A full grouting sleeve embedded with a cone according to claim 1, characterized in that a screw hole is provided in the middle of the sleeve body (3), on which a limit bolt (9) is screwed, Make sure that the bars on both sides have the same anchorage length. 5. A fully grouted sleeve with a built-in cone according to claim 1, characterized in that the sleeve body (3) should be made of high-quality carbon structural steel, low-alloy high-strength steel or alloy structural steel Made of seamless steel pipe. 6. A full-grouting sleeve embedded with a cone according to claim 1, characterized in that the inner diameter of the rubber sealing ring (10) is smaller than that of the bottom inserted steel bar (1) and the upper inserted steel bar (2) The diameter is slightly smaller, and the outer diameter is slightly larger than the inner diameter of the sleeve body (3), so that it has a sealing effect when grouting.

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