Novel grouting sleeve connecting piece and method suitable for nuclear power plant

Abstract

The invention discloses a novel grouting sleeve connecting piece and method suitable for a nuclear power plant, the sleeve connecting piece comprises a sleeve body, a first grouting channel and a second grouting channel are arranged in the sleeve body, and the first grouting channel and the second grouting channel are communicated through a middle channel, so that the whole grouting channel is Z-shaped; a first steel bar is installed in the first grouting channel, a first steel strand is arranged on an extension line of the first grouting channel, and a first end plate is installed at the end of the first steel strand; a second steel bar is installed in the second grouting channel, a second steel strand is arranged on the extension line of the second grouting channel, and a second end plate is installed at the end of the second steel strand; the bent grouting channel is arranged, the steel bars are allowed to be dislocated, eccentric torque is generated, the steel strands and the end plates are arranged on the connecting piece to resist bending moment, therefore, effective connection of the steel bars is achieved, the problem caused by eccentricity is solved, and the dislocated steel bars can be formed through one-time grouting.

Description

Technical Field

[0001] The invention relates to the technical field of grouting sleeves, and in particular to a novel grouting sleeve connector and method suitable for a nuclear power plant. Background Art

[0002] The thickness of the shear wall in a nuclear power plant is generally large, and the diameter of the horizontal and longitudinal steel bars is also large. The construction efficiency is low when relying on the method of manually tying steel bars on site. In addition, due to the large diameter of the main bars, it is extremely difficult to bend and adjust the steel bars on site, the difficulty of controlling the spacing of the steel bars is great, the positioning accuracy is poor, and the quality and consistency of the tying are difficult to guarantee. Therefore, prefabricated assembled shear walls are suitable for the application scenarios of nuclear power plants. However, due to the limitations of comprehensive reasons such as hoisting capacity, it is difficult to implement the prefabrication of the entire shear wall. At present, the most commonly used method is to use a steel cage, which is to pre-tie the horizontal and longitudinal steel bars to form a steel mesh or steel module, and then hoist it into place and pour concrete. Generally, the vertical steel bars of the steel module are connected by extrusion sleeves, and the horizontal steel bars are connected by overlapping. The vertical steel bars are in place first, and the horizontal steel bars are staggered. Due to the use of 100% overlap joints, the steel bars are very dense at the overlap, and due to the large diameter of the steel bars, the overlap length is also long. Therefore, in actual construction, the overlap area is very difficult to install embedded parts. Therefore, solving the connection of the transverse steel bars is a key issue in improving the utilization rate of the steel module.

[0003] Regarding the connection problem of steel bars, the more mature methods currently include grouting sleeves, extrusion sleeves, overlaps, and the like. Since the vertical steel bars are in place first, it is basically difficult to align the horizontal steel bars after the vertical steel bars are in place, and it is inevitable that they will be misaligned, so they can no longer be connected using conventional mechanical connectors. Therefore, it is necessary to research and develop new connectors, on the one hand to solve the problem of misalignment of steel bars, and on the other hand to solve the problem of eccentricity after the steel bars are connected. The prior art proposes an anti-eccentric grouting sleeve, in which a limiter is set inside the grouting sleeve to prevent eccentricity. This method is suitable for thin steel bars, and the density of the complex casting inside the device is difficult to ensure; in addition, the prior art also proposes an anti-eccentric combined grouting sleeve. This patent achieves the effect of anti-eccentricity by setting bolts and internal grooves on the grouting sleeve to clamp the steel bars. The above solution cannot be applied to the construction of steel bar modules, that is, when the steel bars are actually misaligned by a large distance, a simple grouting sleeve is used to connect. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a new type of grouting sleeve connector and method suitable for nuclear power plants, which can achieve effective connection of steel bars and solve the problems caused by eccentricity, and the misaligned steel bars can be grouted and formed in one time in the grouting sleeve.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect of the present invention, there is provided a new type of grouting sleeve connector suitable for a nuclear power plant, comprising a sleeve body, wherein a first grouting channel and a second grouting channel are arranged in the sleeve body, wherein the first grouting channel and the second grouting channel are connected through an intermediate channel, so that the entire grouting channel is Z-shaped; a first steel bar is installed in the first grouting channel, a first steel strand is arranged on the extension line of the first grouting channel, and a first end plate is installed on the end of the first steel strand; a second steel bar is installed in the second grouting channel, a second steel strand is arranged on the extension line of the second grouting channel, and a second end plate is installed on the end of the second steel strand.

[0007] In some embodiments of the present invention, a grouting hole and a grouting hole are provided on the side wall surface of the sleeve body, the grouting hole is connected to the first grouting channel, and the grouting hole is connected to the second grouting channel.

[0008] In some embodiments of the present invention, the openings of the first grouting channel and the second grouting channel are respectively located on the end surface of the sleeve body.

[0009] In some embodiments of the present invention, annular ribs are disposed on the inner wall surfaces of the first grouting channel and the second grouting channel. The annular ribs have a certain curvature and are bent toward the end surface of the sleeve.

[0010] In some embodiments of the present invention, the steel strand, the end plate and the sleeve are an integrally formed structure.

[0011] In some embodiments of the present invention, the diameter of the grouting channel is larger than the diameter of the steel bar, a rubber plug is provided at the opening of the grouting channel, and the steel bar enters the grouting channel after passing through the rubber plug.

[0012] In some embodiments of the present invention, the rubber stopper has a wedge-shaped structure with a circular through hole.

[0013] In some embodiments of the present invention, the cross-section of the sleeve body is elliptical.

[0014] In a second aspect of the present invention, a method for using a novel grouting sleeve connector suitable for a nuclear power plant is provided, wherein the alignment of horizontal steel bars is checked, horizontal steel bars without deviation are directly connected by an extrusion sleeve, and horizontal steel bars with deviation are connected by a novel grouting sleeve connector, and the method specifically comprises the following steps:

[0015] Select a sleeve connector of suitable size according to the deviation, install a rubber plug, and install the first steel bar and the second steel bar into the first grouting channel and the second channel respectively;

[0016] Adjust the position of the sleeve body to ensure that the steel bars and strands are on the same vertical plane;

[0017] Inject grout into the grouting hole and complete the grouting in one go until slurry comes out of the grouting hole.

[0018] In some embodiments of the present invention, before the horizontal steel bars are connected, the block steel cage is prefabricated and the foundation steel bars are reserved; then the steel cage is hoisted, and the limiting fixture is used to prevent the steel cage from deformation, and the steel bars reserved for the foundation and the longitudinal steel bars of the steel cage are corrected to align them, and the extrusion sleeve is used to connect them to complete the connection of the longitudinal steel bars; finally, the horizontal steel bars of the two adjacent block steel cages are connected using a grouting sleeve connector.

[0019] One or more technical solutions of the present invention have the following beneficial effects:

[0020] (1) The novel grouting sleeve connector provided by the present invention allows the steel bars to be misplaced and generate eccentric torque by setting a curved grouting channel. The bending moment is resisted by setting steel strands and end plates on the connector, thereby achieving effective connection of the steel bars and solving the problem caused by eccentricity. Furthermore, the misplaced steel bars can be grouted and formed in one time in the grouting sleeve.

[0021] (2) The novel grouting sleeve connector provided by the present invention can adjust the length of the steel strand and the distance between the steel strand and the hole according to the force and actual deviation, forming a standard product, which solves the problem of difficult installation of embedded parts due to overlapping of horizontal steel bars in nuclear power plants.

[0022] (3) The novel grouting sleeve connector provided by the present invention uses steel strands to reduce the diameter, which is convenient for installation. In addition, the problem of connector torsion caused by eccentric steel bars is solved. The present invention can achieve a torsion-free state by calculating and analyzing the envelope design and balancing the torsion force.

[0023] (4) The novel grouting sleeve connector provided by the present invention can enhance the bonding force between the grouting and the connector by providing an annular rib inside the grouting channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a new type of grouting sleeve connector applicable to a nuclear power plant of the present invention;

[0025] Figure 2 is a schematic diagram of a first steel bar installed in a first grouting channel;

[0026] Figure 3 is a schematic diagram of the end surface of the first grouting channel of the sleeve body;

[0027] Figure 4 Schematic diagram of the new grouting sleeve connector connected to the steel cage.

[0028] In the figure: 1. sleeve body; 2. first grouting channel; 3. second grouting channel; 4. middle channel; 5. first steel bar; 6. second steel bar; 7. first steel strand; 8. second steel strand; 9. first end plate; 10. second end plate; 11. grouting hole; 12. grouting hole; 13. rubber plug; 14. annular rib. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Example 1

[0031] In a typical embodiment of the present invention, a new type of grouting sleeve connector suitable for nuclear power plants is proposed, such as Figure 1-Figure 3 As shown, it includes a sleeve body 1, in which a first grouting channel 2 and a second grouting channel 3 are arranged, and the first grouting channel 2 and the second grouting channel 3 are connected through an intermediate channel 4, so that the entire grouting channel is Z-shaped; a first steel bar 5 is installed in the first grouting channel 1, and a first steel strand 7 is arranged on the extension line of the first grouting channel 1, and a first end plate 9 is installed on the end of the first steel strand 7; a second steel bar 6 is installed in the second grouting channel 3, and a second steel strand 8 is arranged on the extension line of the second grouting channel 3, and a second end plate 10 is installed on the end of the second steel strand 8.

[0032] In this embodiment, a grouting hole 11 and a grouting hole 12 are provided on the side wall of the sleeve body 1. The grouting hole 11 is connected to the first grouting channel 2, and the axis of the grouting hole 11 is perpendicular to the axis of the first grouting channel 2. The grouting hole 12 is connected to the second grouting channel 3, and the axis of the grouting hole 12 is perpendicular to the axis of the second grouting channel 3. The grouting hole and the grouting hole are arranged in the staggered steel bar holes, and the two holes are not aligned but are connected in the sleeve connector, which is convenient for grouting and forming in one step.

[0033] In this embodiment, the openings of the first grouting channel 2 and the second grouting channel 3 are respectively located on the end faces of the sleeve body 1 to achieve the connection of the two horizontal steel bars. By staggering the two steel bar holes and the two steel strands, the anchoring force of the steel strands in the sleeve body is used to balance the bending moment generated when the steel bars at both ends are pulled, thereby achieving the balance of the bending moment during the tension process. In addition to steel strands, other high-strength steels can also be used to balance the torque to achieve force balance. In this embodiment, the end plate generally adopts a square plate, which strengthens the balance of the bending moment.

[0034] In this embodiment, an annular rib 14 is provided on the inner wall surface of the first grouting channel 2 and the second grouting channel 3. The annular rib 14 has a certain curvature and is bent toward the end surface of the sleeve to increase the bonding force between the grouting material and the steel bar and the sleeve connector. In some other implementations of this embodiment, the annular rib can be set in a wedge shape or some existing limiting devices can be added.

[0035] In this embodiment, the steel strands, the end plate and the sleeve body are an integrally formed structure, that is, the steel strands and the end plate are processed and formed in one step during the production process of the sleeve connector.

[0036] In this embodiment, the diameter of the grouting channel is larger than the diameter of the steel bar, and a rubber plug 13 is provided at the opening of the grouting channel, and the steel bar enters the grouting channel after passing through the rubber plug. In some other implementations of this embodiment, if the spacing between the steel bars is too large, multiple channels can be considered to be provided, and multiple channels can be arranged side by side. In the actual installation process, a suitable channel is selected to pass the steel bar, so that the connector can be made into a standard part.

[0037] In this embodiment, the rubber plug 13 adopts a wedge-shaped structure with a circular through hole. The circular through hole is convenient for the passage of steel bars, and the wedge-shaped structure is convenient for installation at the rear of the grouting channel to fix the steel bars in the sleeve connector.

[0038] In this embodiment, the cross-section of the sleeve body is elliptical, and the thickness setting of the sleeve body, the size of the steel bar hole, the selection of the steel strand (nominal diameter and length), and the size of the end plate can all be formed through calculation to form a standard selection design manual to form standard parts.

[0039] The principle of using steel strands to balance torque in the new grouting sleeve connector suitable for nuclear power plants provided in this embodiment is that the connector allows the steel bars to be misplaced, generating eccentric torque, and the bending moment is resisted by arranging steel strands and end plates on the connector, thereby achieving effective connection of the steel bars and solving the problems caused by eccentricity, and the misplaced steel bars can be grouted and formed in one time.

[0040] The present invention solves the problem that the embedded parts of the steel bars are difficult to install due to the overlap of horizontal steel bars in nuclear power plants. The new grouting sleeve connector can adjust the length of the steel strand and the spacing between the steel strand and the channel according to the force and the actual deviation that is easy to cause, forming a standard product; compared with other high-strength steel bars, the use of steel strands reduces the diameter, which is convenient for the overlap installation of horizontal steel bars. In addition, it also solves the problem of torsion of the connector caused by the eccentricity of the steel bars. The present invention can achieve a torsion-free situation by calculating and analyzing the envelope design and balancing the torsion force. The curved grouting channel is set, and the grouting is completed in one time. An annular rib is set inside to enhance the bonding force between the grouting and the connector.

[0041] Example 2

[0042] In a typical embodiment of the present invention, a method for using a new type of grouting sleeve connector suitable for a nuclear power plant is provided. Figure 4 The sub-block steel cage shown in the figure is equipped with additional foundation steel bars. Then the steel cage is hoisted, and the limit fixture is used to prevent the steel cage from deformation. The steel bars reserved for the foundation and the longitudinal steel bars of the steel cage are corrected to align them. The existing extrusion sleeve is used to connect and complete the connection of the longitudinal steel bars. Finally, the horizontal steel bars of the two adjacent sub-block steel cages are connected using the grouting sleeve connector, which specifically includes:

[0043] Check the alignment of the horizontal reinforcement. The horizontal reinforcement without deviation is directly connected by extrusion sleeve. The horizontal reinforcement with deviation is connected by new grouting sleeve connector. The specific steps include:

[0044] Select a sleeve connector of suitable size according to the deviation, install a rubber plug, and install the first steel bar and the second steel bar into the first grouting channel and the second channel respectively;

[0045] Adjust the position of the sleeve body to ensure that the steel bars and strands are on the same vertical plane;

[0046] Inject grout into the grouting hole and complete the grouting in one go until slurry comes out of the grouting hole.

[0047] Furthermore, after the connection of the horizontal reinforcement is completed, the operations can be performed in sequence until the entire wall is assembled.

[0048] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A new type of grouting sleeve connector suitable for nuclear power plants, characterized in that: It includes a sleeve body, in which a first grouting channel and a second grouting channel are arranged, and the first grouting channel and the second grouting channel are connected through an intermediate channel, so that the entire grouting channel is Z-shaped; a first steel bar is installed in the first grouting channel, a first steel strand is arranged on the extension line of the first grouting channel, and a first end plate is installed on the end of the first steel strand; a second steel bar is installed in the second grouting channel, a second steel strand is arranged on the extension line of the second grouting channel, and a second end plate is installed on the end of the second steel strand.

2. The novel grouting sleeve connector suitable for nuclear power plants according to claim 1, characterized in that: A grouting hole and a grouting hole are provided on the side wall surface of the sleeve body. The grouting hole is communicated with the first grouting channel, and the grouting hole is communicated with the second grouting channel.

3. The novel grouting sleeve connector suitable for nuclear power plants according to claim 1, characterized in that: The openings of the first grouting channel and the second grouting channel are respectively located on the end surface of the sleeve body.

4. The novel grouting sleeve connector suitable for nuclear power plants according to claim 1, characterized in that: An annular rib is disposed on the inner wall surface of the first grouting channel and the second grouting channel. The annular rib has a certain curvature and is bent toward the end surface of the sleeve.

5. The novel grouting sleeve connector suitable for nuclear power plants according to claim 1, characterized in that: The steel strand, the end plate and the sleeve are an integrally formed structure.

6. The novel grouting sleeve connector suitable for nuclear power plants according to claim 1, characterized in that: The diameter of the grouting channel is larger than the diameter of the steel bar. A rubber plug is arranged at the opening of the grouting channel. The steel bar enters the grouting channel after passing through the rubber plug.

7. The novel grouting sleeve connector suitable for nuclear power plants according to claim 6, characterized in that: The rubber plug adopts a wedge-shaped structure with a circular through hole.

8. The novel grouting sleeve connector suitable for nuclear power plants according to claim 1, characterized in that: The cross section of the sleeve body is elliptical.

9. A method for using a novel grouting sleeve connector suitable for a nuclear power plant as claimed in any one of claims 1 to 8, characterized in that: Check the alignment of the horizontal reinforcement. The horizontal reinforcement without deviation is directly connected by extrusion sleeve. The horizontal reinforcement with deviation is connected by new grouting sleeve connector. The specific steps include: Select a sleeve connector of suitable size according to the deviation, install a rubber plug, and install the first steel bar and the second steel bar into the first grouting channel and the second channel respectively; Adjust the position of the sleeve body to ensure that the steel bars and strands are on the same vertical plane; Inject grout into the grouting hole and complete the grouting in one go until slurry comes out of the grouting hole.

10. The method for using the novel grouting sleeve connector suitable for a nuclear power plant according to claim 9, characterized in that: Before connecting the horizontal steel bars, prefabricate the block steel cage and reserve the foundation steel bars. Then hoist the steel cage, use the limit fixture to prevent the steel cage from deformation, correct the steel bars reserved in the foundation and the longitudinal steel bars of the steel cage to align them, use the extrusion sleeve to connect, and complete the connection of the longitudinal steel bars. Finally, use the grouting sleeve connector to connect the horizontal steel bars of the two adjacent block steel cages.

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