CN103758291B - A kind of shearing enhancement mode half grout sleeve - Google Patents

Abstract

The invention discloses a shear force enhanced semi-grouting sleeve, which comprises a sleeve body, the sleeve body is a tubular structure, an elastic rubber sealing ring is arranged at the opening of one end of the sleeve body, and the opening of the other end of the sleeve body is A threaded connector is provided at the end of the sleeve body, and a grouting port and a grout outlet are provided on the side wall close to the end of the sleeve body; bolt holes are provided along the side wall of the sleeve body, and shear resistance is installed in the bolt hole bolt. The invention 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, and can be widely used in assembled In concrete structures, it has broad engineering application prospects.

Description

A Shear Enhanced Semi-grouting Sleeve

technical field

The invention belongs to the technical field of construction engineering, in particular to a slurry-anchored sleeve connector used for connecting steel bars between prefabricated concrete components.

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. Grouting sleeves are divided into full grouting sleeves and semi-grouting sleeves according to their structural forms. Both ends of the joints of the full-grouting sleeves are connected to steel bars by grouting; one end of the joints of the half-grouting sleeves is connected to steel bars by grouting, and the other The non-grouting method connects the steel bar, usually the other end adopts the form of screw connection.

At present, according to 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 is relatively strong, it is still relatively heavy, and the material consumption is large, the production cost is high, and the production cost is high. low 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 CN102116075A discloses a novel cement grouting ribbed steel bar connection joint, which is essentially a novel semi-grouting sleeve. The connecting sleeve is a rolled section steel with a circular or polygonal shape, and the hole of the connecting sleeve is a round hole with equal diameter, which is made by milling. When the cement grouting material is poured into the sleeve body, The protruding ring rib connecting the inner wall of the sleeve and the protruding ring at the hole end of the sleeve play a shearing effect when the steel bar is stretched or compressed, and the shearing effect is obvious, but the processing of the sleeve is still relatively complicated, and the processing is time-consuming and laborious. The cost is unfavorable.

Chinese patent document CN102587586A discloses a novel cement grouting thread composite steel bar connection joint, which is essentially a novel semi-grouting sleeve. The main difference from the semi-grouting sleeve mentioned in the Chinese patent document CN102116075A is that the threaded steel bar and the sleeve part are connected through the threaded sleeve, so that the sleeve part can be directly processed by seamless steel pipe or steel pipe, which is different from the Compared with solid steel rods, the milling process reduces material consumption, improves the production efficiency of the connecting sleeve, reduces its production cost, and has better economic and technical indicators.

The semi-grouting sleeve disclosed in Chinese patent document CN102587586A has the above-mentioned advantages, but still has the following problems: ① the grooves and/or ribs are formed by casting or machining, and the disadvantages of time-consuming and labor-intensive processing have not been fundamentally resolved; ②The grooves and/or convex ribs are made by rolling or spinning, and rely on multiple grooves inside the sleeve to resist shearing. It is required that the wall thickness of the sleeve is relatively large, so as to ensure that the tensile force at the thinnest position of the sleeve wall after rolling (pressing) is greater than the tensile force of the connecting steel bar, which will directly lead to the bulky shape of the sleeve; on the other hand, There is still the problem of time-consuming and labor-intensive processing of multiple grooves and/or convex ribs. Although the processing cost is greatly reduced compared with the sleeve disclosed in Chinese patent document CN102116075A, there is still room for improvement.

To sum up, the existing semi-grouting sleeves have disadvantages such as difficult processing, bulky form, and high cost, which are not conducive to the development of housing industrialization and construction industrialization in China.

Contents of the invention

Technical problem to be solved: Aiming at the deficiencies of the prior art, the present invention proposes a shear-enhanced semi-grouting sleeve, which solves the disadvantages of difficult processing and high cost of the sleeve in the existing operation, and guarantees the connection quality of the sleeve. Under the premise, the form of the sleeve is simplified, and the cost of the sleeve is reduced.

Technical solution: In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A shear force enhanced semi-grouting sleeve, including a sleeve body, the sleeve body is a tubular structure, an elastic rubber sealing ring is provided at the opening of one end of the sleeve body, and a thread is provided at the opening of the other end of the sleeve body A connector, and a grouting port and a grout outlet are respectively provided on the side wall near the end of the sleeve body; bolt holes are provided along the side wall of the sleeve body, and shear bolts are installed in the bolt holes.

When using this device to connect two steel bars, one steel bar is inserted into the sleeve body from the elastic rubber sealing ring, and the elastic rubber sealing ring seals the opening where it is located; The connection is fixed; the cement grouting material is poured from the grouting port to fill the hollow part of the sleeve body, and the excess cement grouting material flows out from the grouting port. By setting the shear bolts on the sleeve body, the ring ribs on the cast iron (steel) sleeve can be replaced. It plays the role of a shear key, reasonably dispersing the tensile and compressive stress of the inserted steel bars inside the sleeve body to the entire sleeve body, effectively avoiding local stress concentration on the sleeve body, and greatly improving the tensile capacity of the sleeve body improve. Simultaneously, the form of the sleeve body can be simplified, the weight can be reduced, and the cost can be reduced.

Furthermore, in the present invention, a groove is provided on the side wall near the end of the sleeve body, and a hoop stirrup is provided inside the groove. The setting of the groove makes the sleeve body in the shape of a bottle mouth. Under the action of tension and compression of the steel bar, the cement grouting material inside the sleeve body is in a triaxial stress state. The restraint is more secure. At the same time, considering that the sleeve body is made of ordinary low-carbon steel seamless steel pipe, when the groove is pressed on it, the steel bar is easily reset and deformed at the groove under the action of tension. A hoop stirrup is arranged on the groove, and the hoop hoop can securely hoop the groove of the sleeve body, and the sleeve body restrains the cement grouting material more firmly when the steel bar is pulled.

Preferably, in the present invention, the bolt holes have 3 rows and are evenly distributed on the side wall of the sleeve body with an interval of 120 degrees between each row. Evenly distributed shear bolts can increase the overall shear resistance of the sleeve body on the one hand, and on the other hand can increase the gripping force between the concrete and the sleeve body, so that the sleeve is firmly anchored in the concrete.

Preferably, in the present invention, the shear bolts are high-strength bolts with a property grade of 8.8 or higher, so as to ensure sufficient shear resistance of the shear bolts.

Preferably, in the present invention, the sleeve body is processed from a low-carbon steel seamless steel pipe. Low-carbon steel has good tensile and compressive properties, which provides guarantee for the tensile and compressive strength of the sleeve body, and the source of materials is wide and the cost is low.

Further, in the present invention, the sleeve body is provided with a grout opening on the outer wall of the side where the elastic rubber sealing ring is installed, and a grout outlet is provided on the outer wall of the side connected with the threaded connector.

Further, in the present invention, both the grouting port and the grouting port are arranged on the side wall of the sleeve body close to the end where the elastic rubber sealing ring is installed.

Preferably, in the present invention, the groove is formed by extrusion or rolling. Processing is simple and quick.

As a preference, in the present invention, the groove is formed by rolling first, and then the sleeve body on the outside of the groove is squeezed, the hoop stirrup is inserted into the groove, and then the outside of the groove The sleeve body is flaring and reset.

Preferably, in the present invention, the material of the hoop stirrup is carbon structural steel, and if conditions permit, high-quality carbon structural steel can be used and used after heat treatment.

Beneficial effect:

A shear force enhanced semi-grouting sleeve of the present invention is processed by rolling or stamping with ordinary low carbon steel seamless steel pipe as the material of the sleeve body. On the one hand, the source of materials is extensive, and on the other hand, compared with the milling method in the prior art, the processing is relatively easy, which can greatly reduce the production cost of the sleeve;

By arranging shear bolts and annular stirrups on the sleeve body, the shear performance of the sleeve is greatly improved, and the cost is not increased much. The use of shear bolts instead of grooves or convex ribs reduces time-consuming and laborious machining. The performance of the sleeve is equal to or even better than that of cast steel, cast iron or machined sleeves, and the form of the sleeve body is simplified;

Therefore, a shear-enhanced semi-grouting sleeve of the present invention has the advantages of wide material sources, simple processing and reliable performance, etc., which greatly improves the complicated production of cast iron and cast steel sleeves, high cost, and mechanical milling sleeve processing. It can be widely used in prefabricated concrete structures, and 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;

Fig. 3 is a structural schematic diagram of the connecting column A and column B of the present invention.

In the figure: steel bar A1; screw head 2; threaded connector 3; sleeve body 4; internal threaded hole 5; grouting port 6; grouting port 7; cement grouting material 8; groove 9; hoop stirrup 10; Shear bolt 11; elastic rubber sealing ring 12; steel bar B13; column A15; column B16; steel bar 17 protruding from column A;

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, a shear force-enhanced full grouting sleeve includes a sleeve body 4, the sleeve body 4 is a tubular structure, and is processed by a low-carbon steel seamless steel pipe. The opening of one end of the sleeve body 4 is provided with an elastic rubber sealing ring 12, and the opening of the other end of the sleeve body 4 is an internally threaded hole 5, and the internally threaded hole 5 is provided with a threaded connector 3, and the threaded connector 3 are respectively provided with connector internal thread 31 and connector external thread 32, and one end provided with elastic rubber sealing ring 12 can be directly inserted into steel bar B13, and one end provided with threaded connector 3 passes through threaded connector 3 and is provided with threaded wire The steel bar A1 of head 2 is connected. The sleeve body 4 is provided with a grout opening 6 on the outer wall of the side where the elastic rubber sealing ring 12 is installed, and a grout outlet 7 is provided on the outer wall of the side connected with the threaded connector 3; The side wall of the sleeve body 4 is provided with bolt holes, and the bolt holes have 3 rows and are evenly distributed on the side wall of the sleeve body 4 at an interval of 120 degrees between each row. Shear bolts 11 are installed in each bolt hole. , the total number and diameter of the shear bolts 11 need to be calculated and determined according to the type of connecting steel bar and the diameter of the steel bar, and the length of the shear bolts 11 extending into the sleeve body 4 should be no less than 1/4 and no more than 1/3 set The inner diameter of the cylinder body 4 is appropriate, and the shear bolts 11 are high-strength bolts with a performance grade above 8.8. The side walls at both ends of the sleeve body 4 are also provided with a groove 9 around the sleeve body 4, the depth of the groove 9 is no less than 1/4 and no more than 1/3 of the sleeve body The inner diameter of 4 is appropriate, and the method of rolling can be preferentially used for processing, or the method of cooperating with the bottom die and pressing the upper part for processing. After the processing of the groove 9 is completed, the sleeve body 4 outside the groove 9 is squeezed, the hoop stirrup 10 is firmly inserted into the groove 9, and then the outside of the groove 9 is squeezed and deformed. The side wall is flared to recover the deformed part of the sleeve body 4 .

There are prefabricated columns at a certain node, which are column A15 and column B16 respectively. As shown in Figure 3, it is desired to connect the steel bar 17 protruding from column A with the protruding steel bar 18 on column B. First, one side of the threaded connector 3 of the shear-force-enhanced semi-grouting sleeve of the present invention is installed on the threaded thread head 2 at the end of the longitudinal reinforcement 17 on the column A, and the threaded connector 3 has an internal thread, which is connected to the column A. The external threads on the upper longitudinal steel bar 17 are engaged, and after all the steel bars to be connected on the column A15 are dressed, the stirrups on the column are bound, and the column concrete is poured. Next, butt the columns, hoist the column A15 to the pre-installation position, that is, above the steel bars 18 protruding from the column B, align the steel bars on the column A15 and the column B16 one by one, and install the elastic rubber seal on the sleeve body 4 One end of circle 12 is inserted slowly on the column B and stretches out on the steel bar 18. After the insertion is completed, support the column A15, pour the cement grout 8 from the grouting port 6 of the sleeve body 4, stop the grouting after it flows out of the grouting port 7, and correct the grouting port 6 and the grouting port of the sleeve body 4 Port 7 is blocked. The same method is used to complete the connection of the remaining steel bars at the joint, and the construction of the joint will be completed after the strength of the cement grouting material 8 in the sleeve body 4 reaches the design strength.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (8)

1. shearing enhancement mode half grout sleeve, it is characterized in that: comprise sleeve body (4), described sleeve body (4) is tubular structure, the opening part that sleeve body is (4) one is provided with elastic rubber sealing ring (12), the opening part of sleeve body (4) other end is provided with threaded connector (3), and is provided with grouting mouth (6) and grout outlet (7) on the sidewall near sleeve body (4) end position; Sidewall along sleeve body (4) is provided with bolt hole, is provided with shearing bolt (11) in described bolt hole; The sidewall of the close end of described sleeve body (4) is provided with groove (9), in described groove (9), hoop is provided with hoop stirrup (10); Described bolt hole have 3 row and often row between 120 degree, interval be distributed in equably on the sidewall of sleeve body (4).

2. a kind of shearing enhancement mode half grout sleeve according to claim 1, is characterized in that: described shearing bolt (11) is the high-strength bolt of performance rate more than 8.8 grades.

3. a kind of shearing enhancement mode half grout sleeve according to claim 1, is characterized in that: sleeve body (4) processes for mild steel seamless steel pipe.

4. according to a kind of shearing enhancement mode half grout sleeve according to claim 1, it is characterized in that: described sleeve body (4) is provided with grouting mouth (6) on the outer wall of side that elastic rubber sealing ring (12) is housed, and the outer wall of the side be connected with threaded connector (3) is provided with grout outlet (7).

5. according to a kind of shearing enhancement mode half grout sleeve according to claim 1, it is characterized in that: described grouting mouth (6) and grout outlet (7) are all arranged on the sidewall of the sleeve body (4) installing elastic rubber sealing ring (12).

6. a kind of shearing enhancement mode half grout sleeve according to claim 1, is characterized in that: described groove (9) is extruding or roll forming.

7. a kind of shearing enhancement mode half grout sleeve according to claim 1, it is characterized in that: after described groove (9) first adopts roll forming, again the sleeve body (4) in groove (9) outside is extruded, hoop stirrup (10) is inserted in groove (9), then the sleeve body (4) in groove (9) outside is carried out enlarging reset.

8. a kind of shearing enhancement mode half grout sleeve according to claim 1, is characterized in that: the material of described hoop stirrup (10) is structural carbon steel.