CN112411887B - A kind of preparation method of multi-stage pre-embedded prefabricated component of steel bar grouting sleeve connection joint - Google Patents

Abstract

The invention provides a method for preparing a multi-stage pre-embedded prefabricated component of a steel bar grouting sleeve connecting joint, comprising the following steps: preparing a table mold, arranging steel bars (10) in the table mold; connecting a grouting sleeve (8) at the bottom end of the steel bar ), set a magnetic guide tube at the bottom of part of the grouting sleeve (8) so that the position of the grouting sleeve (8) is not at the same height, and stagger the pre-embedded grouting sleeve (8); after the pre-embedded position of the grouting sleeve (8) is set, Concrete is poured; after the concrete is solidified, the magnetic guide cylinder is drawn out, and the bottom of the grouting sleeve (8) forms a cavity connected with the outside, and the multi-stage pre-embedded prefabricated component of the connection joint of the reinforced grouting sleeve is obtained, and the magnetic guide cylinder is recycled. The method can well realize the vertical dislocation connection of the prefabricated shear wall, which meets the specified requirements, and the construction method is simple, the disassembly is convenient, and the magnetic guide tube can be recycled.

Description

A kind of preparation method of multi-stage pre-embedded prefabricated component of steel bar grouting sleeve connection joint

technical field

The invention relates to the field of prefabricated buildings, in particular to a preparation method of a multi-stage pre-embedded prefabricated component of a steel grouting sleeve connection joint.

Background technique

my country's "Code for Design of Concrete Structures" GB50010 requires the steel bar connection of reinforced concrete structures. The requirements for the area percentage of lap joints in the same connection section are as follows: for wall components, it should not be greater than 25%; for column components, it should not be more than 25%. More than 50%, the splicing of walls, columns and prefabricated components can be appropriately relaxed. At present, the semi-grouting sleeve connection steel joints of prefabricated vertical precast concrete members are generally embedded in the same connection section of the frame columns or shear (seismic) walls of the vertical precast members. Under the action of repeated horizontal loads , especially under the action of earthquake load, if the individual steel half-sleeve grouting connection joint fails, it will bring huge pressure of failure to the other steel half-sleeve grouting connection joints in the section, thus bringing continuous continuous force to the vertically stressed prefabricated components. risk of destruction. Therefore, the steel bar connection method of the semi-grouting sleeves of vertical precast concrete members such as fabricated shear walls or frame columns cannot meet the requirements of my country's "Code for Design of Concrete Structures" GB50010. The specified requirements for the percentage of joint area.

The lap joint of tension steel bars is one of the difficult problems in the structural treatment of prefabricated shear walls or frame columns and other vertical prefabricated components. ) Using the semi-grouting sleeve and the long sleeve to realize the vertical dislocation connection of steel bars, this method needs to process the connection between the semi-grouting sleeve and the long sleeve, and the long sleeve is directly embedded in the prefabricated shear wall, processing and installation The alignment is more troublesome and the cost is higher.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a method for preparing a multi-stage pre-embedded prefabricated member of a reinforced grouting sleeve connection joint. The vertical dislocation connection meets the requirements of GB50010 of my country's "Code for Design of Concrete Structures" on the area percentage of the lap joints where the steel bars are connected in the same connection section, and the construction method is simple, and the magnetic guide tube can be recycled.

The method of the invention can overcome the defects in the background, and at the same time, it can also be used in prefabricated frame concrete columns, and can effectively solve the problem that the frame columns of prefabricated components or the longitudinal reinforcement of shear force (seismic) walls are connected in the same connection at the structural design level. The problem of lap joints of steel bars in the section improves the seismic performance and continuous collapse resistance of the fabricated structure and the reliability of the structure; on the construction level, the method is simple to operate and low in cost.

In order to realize the above-mentioned purpose of the invention, the technical scheme of the present invention is:

A method for preparing a multi-stage pre-embedded prefabricated component for connecting a joint of a steel grouting sleeve, comprising the following steps:

Step 1: Prepare a table mold, and set steel bars in the table mold;

Step 2: Connect a grouting sleeve at the bottom end of the steel bar, set a magnetic guide cylinder at the bottom of part of the grouting sleeve so that the position of the grouting sleeve is not at the same height, and stagger the pre-embedded grouting sleeve; the magnetic guide cylinder includes a guide cylinder body, and the The main body of the guide cylinder is divided into the lower part of the guide cylinder and the upper part of the guide cylinder, and the outer diameter of the upper part of the guide cylinder is smaller than the outer diameter of the lower part of the guide cylinder; the magnetic guide cylinder also includes a limit ring piece, a magnet ring and an isolation film The magnet ring is sleeved on the outer periphery of the upper connecting section of the guide cylinder, and is located at the connection between the lower part of the guide cylinder and the upper connecting section of the guide cylinder, and the limiting ring piece is arranged above the magnet ring for fixing the magnet ring; the The isolating film sleeve is arranged on the outer periphery of the lower part of the guide cylinder and the upper connecting section of the guide cylinder; the upper connecting section of the guide cylinder is connected with the grouting sleeve, and the two are separated by the isolating film sleeve;

Step 3: After the pre-embedded position of the grouting sleeve is set, pour the concrete;

Step 4: After the concrete is solidified, the magnetic guide tube is drawn out, and the bottom of the grouting sleeve forms a cavity connected with the outside, and the multi-stage embedded prefabricated component of the connection joint of the reinforced grouting sleeve is obtained, and the magnetic guide tube is recycled.

Preferably, the upper connecting section of the guide cylinder is provided with a threaded connection structure matching the internal shape of the grouting sleeve.

Preferably, the outer diameter of the lower part of the guide cylinder, the limiting ring piece and the magnet ring are the same.

Preferably, the diameter of the lower part of the guide cylinder is the same as the outer diameter of the semi-grouting sleeve, and a certain gap is left between the diameter of the upper connecting section of the guide cylinder and the inner diameter of the grouting sleeve for setting the isolation film sleeve.

Preferably, the gap between the upper connecting section of the guide cylinder and the shear key in the sleeve is not more than 1 mm, and the length of the lower part of the guide cylinder, the length and diameter of the upper connecting section of the guide cylinder, and the arrangement of the guide cylinder can be designed according to the design. need to be sure.

Preferably, the shear key in the sleeve is common knowledge.

Preferably, the bottom of the upper connecting section of the guide cylinder is provided with reserved screw holes for disassembly. When the guide cylinder is dismantled, use the dismantling bolts to connect with the reserved screw holes for dismantling, so as to facilitate the dismantling of the guide cylinder.

The connecting end of the guide cylinder and the sleeve is magnetic, so as to form a detachable and stable connection with the sleeve, and assist in forming a closed chamber during the grouting connection operation.

The outside of the guide cylinder is covered with an isolation film sleeve, so that the guide cylinder can be drawn out and recycled after the initial setting of the grouting material. The material requirements of the isolation film sleeve are consistent with the production requirements.

A multi-stage pre-embedded connection structure of a steel bar grouting sleeve connection joint, comprising a prefabricated component concrete, reinforcing bars in the prefabricated component, and a grouting sleeve, the bottom end of the reinforcing bar is connected to the grouting sleeve, and characterized in that it also includes a magnetic guide cylinder, The magnetic guide cylinder is connected under the grouting sleeve to set the grouting sleeve at different height positions in the concrete of the prefabricated component.

Preferably, the height and arrangement of the magnetic guide cylinders along the grouting sleeve can be determined according to design requirements.

The key points of the present invention are:

In this method, the semi-grouting sleeve can be placed on the section required by the design by installing magnetic guide cylinders of different lengths, so that the semi-grouting sleeve of the prefabricated concrete member can connect the steel bar joints to meet the requirements of the steel bars connected in the same connection section. Design requirements for area percentage of lap joints for tension bars.

This method designs a set of detachable guide cylinders, which are adsorbed on the grouting sleeve through a fixed magnetic ring. Guide barrel removal.

The advantages of the present invention are:

1. There is no need to perform any processing on the semi-grouting sleeve, and the steel bars of the semi-grouting sleeve are placed on the section required by the design through detachable magnetic guide cylinders of different lengths. By using different lengths of magnetic guide cylinders, the semi-grouting sleeve can be placed on the section required by the design, and the prefabricated precast concrete component half-grouting sleeve connecting the steel bar joints can be installed on the section required by the design in multiple stages.

2. By staggering the positions of the steel bar connection joints, the seismic performance and continuous collapse resistance of the fabricated structure can be effectively improved, and the reliability of the structure can be improved.

3. By pulling out the inner cavity formed by the magnetic guide cylinder, the problem of difficult grouting of sleeves with different heights can be solved.

4. The magnetic guide tube used can be recycled, the cost is low, the manufacturing process is simple, the price is cheap, the installation and removal of the guide tube is simple, and it can be reused.

Description of drawings

Fig. 1 is the structural schematic diagram of magnetic guide cylinder;

Figure 2 is a schematic diagram of the connection between the magnetic guide cylinder and the semi-grouting sleeve;

Figure 3 is a schematic diagram of prior art sleeves arranged in a row;

Figure 4 is a schematic diagram of the arrangement of sleeves in two rows;

Figure 5 is a schematic diagram of the arrangement of sleeves in three rows;

Figure 6 is a schematic diagram of a sleeve steel bar connecting joint;

Among them, 1─the lower part of the magnetic guide cylinder, 2─the upper connecting section of the magnetic guide cylinder, 3─limiting ring piece, 4─magnet ring, 5─reserved screw holes for disassembly, 6─removal bolts, 7─isolation film sleeve , 8 ─ grouting sleeve, 9 ─ precast concrete, 10 ─ steel.

Detailed ways

The detailed structure of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

A method for preparing a multi-stage pre-embedded prefabricated component for connecting a joint of a steel grouting sleeve, comprising the following steps:

(1) Prepare a table mold, and set steel bars 10 in the table mold;

(2) Connect the grouting sleeve 8 at the bottom end of the steel bar, set a magnetic guide cylinder at the bottom of part of the grouting sleeve 8 so that the position of the grouting sleeve 8 is not at the same height, and stagger the pre-embedded grouting sleeve 8; the magnetic guide cylinder includes a guide cylinder The guide cylinder body is divided into a guide cylinder lower part 1 and a guide cylinder upper connecting section 2. The outer diameter of the guide cylinder upper connecting section 2 is smaller than the outer diameter of the guide cylinder lower part 1; the magnetic guide cylinder also includes a limit The ring piece 3, the magnet ring 4 and the isolation film sleeve 7, the magnet ring 4 is sleeved on the outer periphery of the upper connecting section 2 of the guide cylinder, and is located at the connection between the lower part 1 of the guide cylinder and the upper connecting section 2 of the guide cylinder, the limit ring The sheet 3 is arranged above the magnet ring 4 for fixing the magnet ring 4; the isolating film sleeve 7 is arranged on the outer periphery of the lower part 1 of the guide cylinder and the upper connecting section 2 of the guide cylinder; the upper connecting section 2 of the guide cylinder is connected with the grouting sleeve , and the two are separated by an isolation film sleeve 7;

(3) After the pre-embedded position of the grouting sleeve 8 is set, pour concrete;

(4) After the concrete is solidified, the magnetic guide cylinder is drawn out, and the bottom of the grouting sleeve 8 forms a cavity connected to the outside, and the multi-stage embedded prefabricated component of the reinforced grouting sleeve connection joint is obtained, and the magnetic guide cylinder is recycled.

Figure 1 and Figure 2 show the schematic diagram of the structure of the magnetic conductor. The diameter of the lower part of the magnetic conductor is the same as the outer diameter of the semi-grouting sleeve, and the diameter of the upper part is basically the same as the inner diameter of the grouting sleeve with a certain gap. The material can be steel or other materials with better Rigid material, the lower surface is smooth to facilitate the formation of holes and extraction in the component, the upper part is threaded, the inner diameter of the magnet ring is slightly larger than the outer diameter of the upper rod of the guide cylinder and not larger than the outer diameter of the lower rod, and can be sleeved on the upper rod and It is stuck at the step change of the section of the guide cylinder, and then tightened with the matching nut to fix the magnet on the guide cylinder. The outer surface of the isolation film sleeve requires good mold release, and the material can be polypropylene fiber cloth or other similar materials.

Figure 3 shows a common practice in the construction process at this stage. The sleeves are arranged in the same section, which is equivalent to the steel bars being connected in the same connection section.

Figures 4 and 5 adopt the setting structure of the present invention, a multi-level embedded connection structure of a steel bar grouting sleeve connection joint, including a prefabricated component concrete 9, a steel bar 10 in a prefabricated component, and a grouting sleeve 8. The steel bar 10 The bottom end is connected with the grouting sleeve 8 , and also includes a magnetic guide cylinder, which is connected under the grouting sleeve to set the grouting sleeve 8 at different heights in the prefabricated concrete 9 . Arrange the sleeves in two or three rows, and the spacing between the rows is arranged according to the design requirements. By staggering the embedding position of the sleeve, the purpose of dislocating the position of the steel bar joint is achieved.

Figure 6 is a structural diagram of the arrangement when the sleeves are arranged at three different depths. In order to enable the built-in sleeve to form the cavity required for grouting when pouring components, a detachable guide cylinder can be pre-buried together with the sleeve. In this way, the desired channel is formed during the pouring process of the component. The top of the guide cylinder is a straight rod with a diameter slightly smaller than the inner diameter of the sleeve, which directly extends into the sleeve for a certain length. A magnet ring is arranged at the step change of the cross section of the guide cylinder. It won't come off when pouring. The entire surface of the guide cylinder (including the part extending into the sleeve) is covered with a layer of isolating film sleeve, which is used to isolate the guide cylinder from the concrete of the component, so as to facilitate the extraction of the guide cylinder after the component is poured. The length of the guide cylinder can be determined according to the embedded depth of the sleeve.

The invention provides a graded pre-embedding structure for semi-grouting sleeves connecting steel bar joints in the production of vertical force prefabricated components. The grouting sleeves connecting steel bars are staggered and pre-embedded in the prefabricated components through detachable magnetic guide tubes of different lengths. , the cavity formed after dismantling the magnetic guide cylinder can not only introduce the steel bars of the lower prefabricated components, but also communicate with the grouting chamber between the prefabricated components, thus solving the difficulty of on-site assembly and construction of the built-in sleeve grouting. Since the connecting joint of the grouting sleeve steel bar can be placed on the section required by the design, it avoids the traditional practice of pre-embedding the grouting sleeve at the edge of the component with the half-grouting sleeve connecting joint of the steel bar of the traditional vertically stressed prefabricated component. The prefabricated half-grouting sleeve connecting the steel bar joints is not in the same connection section, therefore, the present invention makes it easy to realize the tension steel bar in the same connecting section of the prefabricated vertical stress precast concrete component half-grouting sleeve connecting the steel bar joints Design requirements for area percentage of lap joints.

The above is the specific embodiment of the present invention, but the protection scope of the present invention is not limited to this, any person skilled in the art is within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its concept to be equivalently replaced Or changes should be covered within the protection scope of the claims of the present invention.

Claims (7)

1. a kind of preparation method of multi-level pre-embedded prefabricated member of reinforcing bar grouting sleeve connection joint, is characterized in that, comprises the following steps: Step 1: prepare a table mold, and set steel bars (10) in the table mold; Step 2: Connect the grouting sleeve (8) at the bottom end of the steel bar, set a magnetic guide tube at the bottom of part of the grouting sleeve (8) so that the position of the grouting sleeve (8) is not at the same height, and stagger the pre-embedded grouting sleeve (8); The magnetic guide cylinder comprises a guide cylinder body, the guide cylinder body is divided into a guide cylinder lower part (1) and a guide cylinder upper connecting section (2), and the outer diameter of the guide cylinder upper connecting section (2) is smaller than that of the guide cylinder lower part The outer diameter of (1); the magnetic guide cylinder further includes a limit ring piece (3), a magnet ring (4) and an isolation film sleeve (7), and the magnet ring (4) is sleeved on the upper connecting section of the guide cylinder (2) The outer circumference is located at the connection between the lower part (1) of the guide cylinder and the upper connecting section (2) of the guide cylinder, and the limit ring piece (3) is arranged above the magnet ring (4) and is used to fix the magnet ring (4) ); the isolating film sleeve (7) is arranged on the outer periphery of the lower part (1) of the guide cylinder and the upper connecting section (2) of the guide cylinder; the upper connecting section (2) of the guide cylinder is connected with the grouting sleeve, and the two separated by an insulating film sleeve (7); Step 3: After the pre-embedded position of the grouting sleeve (8) is set, pour concrete; Step 4: After the concrete is solidified, the magnetic guide tube is drawn out, and the bottom of the grouting sleeve (8) forms a cavity communicating with the outside, so as to obtain a multi-stage pre-embedded prefabricated component of the connection joint of the reinforced grouting sleeve, and the magnetic guide tube is recycled. 2. The method for preparing a multi-stage pre-embedded prefabricated component of a reinforced grouting sleeve connection joint according to claim 1, wherein the upper connecting section (2) of the guide cylinder is provided with a threaded connection that matches the internal shape of the grouting sleeve structure. 3. The method for preparing a multi-stage pre-embedded prefabricated component for a reinforced grouting sleeve connection joint according to claim 1, wherein the guide cylinder lower part (1), the limit ring piece (3) and the magnet ring (4) The outer diameter is the same. 4. The method for preparing a multi-stage pre-embedded prefabricated component of a steel bar grouting sleeve connection joint according to claim 1, wherein the diameter of the lower part (1) of the guide cylinder is consistent with the outer diameter of the semi-grouting sleeve, and the upper part of the guide cylinder is connected to A certain gap is left between the diameter of the section (2) and the inner diameter of the grouting sleeve for setting the isolation film sleeve (7). 5. The method for preparing multi-stage pre-embedded prefabricated components of steel bar grouting sleeve connection joint according to claim 4, characterized in that the gap between the upper connecting section (2) of the guide cylinder and the shear key in the sleeve is not equal. more than 1mm. 6 . The method for preparing a multi-stage pre-embedded prefabricated component of a reinforced grouting sleeve connection joint according to claim 4 , wherein the material requirements of the isolation film sleeve ( 7 ) are consistent with the production requirements. 7 . 7. The method for preparing a multi-stage pre-embedded prefabricated component of a reinforced grouting sleeve connection joint according to any one of claims 1 to 6, wherein the bottom of the upper connecting section (2) of the guide cylinder is provided with a reserve for disassembly screw hole (5).

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