Vacuum auxiliary grouting control system

Abstract

The utility model provides a vacuum auxiliary grouting control system. The vacuum auxiliary grouting control system comprises a grouting mechanism and a vacuum mechanism which are connected with the two ends of a box girder pore channel through connecting joints respectively. The connecting joint comprises a pipe head and a sealing sleeve, one end of the pipe head extending into the box girder duct is sleeved with the sealing sleeve, and the other end of the pipe head is connected with a rubber pipe through a detachable joint; a check ring corresponding to the sealing sleeve is arranged at the end of the pipe head, the sealing sleeve is assembled in a sliding mode in the axial direction of the pipe head, and the stop spiral ring and the check ring are matched to extrude the sealing sleeve in the axial direction so that the sealing sleeve can tightly extrude the pipe head and the inner wall of a box girder hole channel in the radial direction. Vacuum auxiliary equipment is arranged for air exhaust, so that the duct of the box girder is in a vacuum state, the whole pipeline is filled with slurry, the plumpness and compactness are improved, it is guaranteed that the slurry in the duct is full and dense, the slurry is closely connected with the steel strand, no bubble or cavity exists in the slurry, and the grouting plumpness is guaranteed; and the mud jacking time is greatly shortened through vacuum assistance, and the production work efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete box girder grouting, and particularly relates to a vacuum-assisted grouting control system. Background Art

[0002] Since the prestressed duct grouting of bridges is a concealed project, the prestressed duct is also called a corrugated pipe, and the grouting compactness has an important impact on the durability of the bridge. If the grouting is not compact, the steel strands in the prestressed duct will rust, and the prestress will be lost in advance, which can cause the actual life of the bridge to be shortened to one-tenth of the designed life. In the prior art, due to the presence of air in the duct, there is a certain resistance when the cement slurry enters the duct during the grouting construction, and there are many bubbles inside the slurry, and the bubbles cannot be discharged in time, which seriously affects the quality of the project.

[0003] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above deficiencies in the prior art, and the utility model provides a vacuum-assisted grouting control system.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A vacuum-assisted grouting control system includes a grouting mechanism and a vacuum mechanism that are respectively connected to both ends of a box girder duct through connection joints.

[0007] The grouting mechanism includes a first valve body, a grouting pump and a mixer that are sequentially connected in series through a rubber tube.

[0008] The vacuum mechanism includes a third valve body and a vacuum pump that are sequentially connected in series through a rubber tube, and the third valve body and the connection joint are correspondingly connected to a second valve body through a tee pipe.

[0009] The connection joint includes a pipe head and a sealing sleeve. One end of the pipe head extending into the box girder duct is sleeved with a sealing sleeve, and the other end of the pipe head is connected to a rubber tube through a detachable joint.

[0010] A retaining ring corresponding to the sealing sleeve is provided at the end of the pipe head. The sealing sleeve is axially slidably assembled with respect to the pipe head. A retaining stop ring corresponding to the sealing sleeve is threadedly assembled on the part of the pipe head outside the box girder duct. The retaining stop ring is driven along the thread of the pipe head to cooperate with the retaining ring to axially squeeze the sealing sleeve, so that the sealing sleeve radially squeezes the pipe head and the inner wall of the box girder duct.

[0011] Preferably, a first vacuum pressure gauge is provided between the grouting pump and the first valve body.

[0012] Preferably, a second vacuum pressure gauge is provided between the vacuum pump and the third valve body;

[0013] A filter is provided between the vacuum pressure gauge and the third valve.

[0014] Preferably, detachable joints are provided on the rubber hoses at both ends corresponding to the filter.

[0015] Preferably, the sealing sleeve is made of rubber.

[0016] Preferably, a hexagonal portion is provided at one end of the pipe head away from the box girder duct.

[0017] Beneficial effects: A vacuum auxiliary device is provided for air extraction, so that a vacuum state is formed in the box girder duct, enabling the grout to fill the entire pipeline to improve the fullness and density, ensuring that the grout in the duct is full and dense, the grout is in close contact with the steel strands, there are no bubbles or cavities in the grout, guaranteeing the fullness of the grouting, and greatly shortening the grouting time through the assistance of vacuum, thus greatly improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The schematic diagrams in the specification forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0019] Figure 1 is a structural schematic diagram of the grouting control system in the specific embodiment provided by the present invention;

[0020] Figure 2 is a structural schematic diagram of the connection joint in the specific embodiment provided by the present invention.

[0021] In the figure: 1, vacuum pump; 2, second vacuum pressure gauge; 3, filter; 4, second valve body; 5, tee; 6, box girder duct; 7, first valve body; 8, first vacuum pressure gauge; 9, grouting pump; 10, mixer; 11, pipe head; 12, stop ring; 13, sealing sleeve; 14, retaining ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0023] In the description of the present utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and does not require the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. The terms "connected" and "joined" used in the present utility model should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other.

[0025] As Figure 1-2 shown, a vacuum-assisted grouting control system includes a grouting mechanism and a vacuum mechanism respectively connected to both ends of a box girder duct 6 through a connection joint. The grouting mechanism is used to grout into the box girder duct 6, and the vacuum mechanism is used to assist in air extraction before grouting to make the box girder duct 6 in a vacuum state, so that the grout fills the entire pipeline to improve the fullness and density, ensure that the grout in the duct is full and dense, the grout is in close contact with the steel strand, there are no bubbles or voids in the grout, and the fullness of grouting is ensured.

[0026] The grouting mechanism includes a first valve body 7, a grouting pump 9 and a mixer 10 connected in series in sequence through a rubber tube. The mixer 10 is used to mix cement and water. The mixer 10 is connected to the grouting pump 9 through a rubber tube to press the mixed cement slurry into the box girder duct 6. The vacuum mechanism includes a third valve body and a vacuum pump 1 connected in series in sequence through a rubber tube from near to far. The vacuum pump 1 forms a vacuum in the box girder duct 6 through air extraction, thereby greatly shortening the grouting time and greatly improving the production efficiency through the assistance of vacuum. Among them, the third valve body and the connection joint are correspondingly connected to the second valve body 4 through a tee pipe 5.

[0027] In this embodiment, a first vacuum pressure gauge 8 is provided between the grouting pump 9 and the first valve body 7. A second vacuum pressure gauge 2 is provided between the vacuum pump 1 and the third valve body; the vacuum pressure gauge is used to display the pressure in the pipeline, so the grouting parameters can be accurately controlled. A filter 3 is provided between the vacuum pressure gauge and the third valve. The filter 3 can be a conventional air filter and is used to filter the air drawn into the vacuum pump 1 to prevent cement slurry or other impurities from entering the vacuum pump 1.

[0028] In specific use: Use high-pressure air to blow out the residual moisture in the pipeline, and then respectively connect the grouting mechanism and the vacuum mechanism to the two ends of the box girder duct 6 through connecting joints. Preferably, the grouting hole corresponding to the grouting end of the grouting mechanism is placed under the anchor plate. Close the first valve body 7 and the second valve body 4 and open the third valve body. Start the vacuum pump 1 to evacuate. When the vacuum degree reaches -0.09 MPa to -0.1 MPa, the first valve body 7 can be opened, and the grouting pump 9 is started to start grouting. Keep the vacuum pump 1 in the open state. A transparent tube is provided on the rubber tube between the filter 3 and the third valve body. When it is observed in the transparent tube that there is grout passing through the filter 3, turn off the vacuum pump 1 and the third valve body; open the second valve body 4 and observe the grout discharge situation of the exhaust pipe. When the grout consistency is the same as before pouring, turn off the second valve body 4 and continue grouting. Make the pressure in the pipeline 0.5 - 0.6 MPa, hold the pressure for 1 - 2 minutes, and then turn off the first valve body 7.

[0029] In this embodiment, the connecting joint includes a pipe head 11 and a sealing sleeve 13. The diameter of the pipe head 11 is adapted to the diameter of the orifice of the box girder duct 6. Specifically, it is slightly smaller than the box girder duct 6 to ensure that it can be smoothly inserted or withdrawn after the sealing sleeve 13 is sleeved. One end of the pipe head 11 extending into the box girder duct 6 is sleeved with a sealing sleeve 13, and the other end of the pipe head 11 is connected to a rubber tube through a detachable joint. Generally, the diameter of the rubber tube is smaller than the diameter of the pipe head 11. Therefore, the pipe head 11 is set as a cap-like structure, and an access pipe corresponding to the rubber tube is provided at its closed end. A retaining ring 14 corresponding to the sealing sleeve 13 is provided at the end of the pipe head 11. The width of the retaining ring 14 is adapted to the thickness of the rubber tube. The sealing sleeve 13 is axially slidably assembled with respect to the pipe head 11. A retaining screw ring 12 is threadedly assembled on the part of the pipe head 11 outside the box girder duct 6. The retaining screw ring 12 is driven along the thread outside the pipe head 11, so as to change the distance between the two. After the distance between the two is reduced, it can cooperate with the retaining ring 14 to axially extrude the sealing sleeve 13, so that the sealing sleeve 13 deforms radially, and the pipe head 11 and the inner wall of the box girder duct 6 are tightly squeezed through the deformation, thereby avoiding the construction difficulty of conventional glue adhesion.

[0030] In an alternative embodiment, detachable joints are provided on the rubber tubes at both ends corresponding to the filter 3. After grouting is completed, the filter 3 can be removed, and after cleaning the filter 3, it can be connected to another group of ducts for grouting. The vacuum-assisted grouting of the ducts should be continuous and completed at one time. If a fault that cannot be eliminated in time occurs, the grouting pipeline should be immediately removed, and the duct should be flushed with high-pressure water. After the fault is eliminated, grouting should be carried out again.

[0031] The sealing sleeve 13 is made of rubber material, and a plurality of annular flanges are provided on the outer wall of the sealing sleeve 13. The annular flanges are integrally formed with the sealing sleeve 13, which can increase the friction with the duct and improve the sealing effect. A hexagonal part is provided at the end of the pipe head 11 away from the box girder duct 6, so that it can be held by a wrench to ensure the driving of the retaining screw ring 12.

[0032] In an alternative embodiment, the end of the pipe head is provided with a perforation corresponding to the sealing sleeve 13. During the grouting pressurization process, the grout enters the sealing sleeve 13, thereby improving the sealing effect through the grout pressure. After the grouting is completed, the grout flows out under the action of the sealing sleeve 13, and both ends of the sealing sleeve 13 are hermetically sealed by extrusion with the retaining ring and the snap ring respectively.

[0033] In an alternative embodiment, the sealing sleeve 13 is in multiple sections, and a retaining ring that slides axially along the pipe head 11 is provided between the two sections of the sealing sleeve 13. The thickness of the retaining ring is adapted to the sealing sleeve 13, thereby forming two seals to ensure the sealing effect.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A vacuum-assisted grouting control system, characterized in that, It includes a grouting mechanism and a vacuum mechanism respectively connected to both ends of the box girder duct through connecting joints; The grouting mechanism includes a first valve body, a grouting pump and a mixer connected in series through a rubber tube in sequence; The vacuum mechanism includes a third valve body and a vacuum pump connected in series through a rubber tube in sequence, and the third valve body and the connecting joint are correspondingly connected to a second valve body through a tee pipe; The connecting joint includes a pipe head and a sealing sleeve. One end of the pipe head extending into the box girder duct is sleeved with a sealing sleeve, and the other end of the pipe head is connected to a rubber tube through a detachable joint; A retaining ring corresponding to the sealing sleeve is provided at the end of the pipe head. The sealing sleeve is axially slidably assembled with respect to the pipe head. A retaining screw ring corresponding to the sealing sleeve is threadedly assembled on the part of the pipe head outside the box girder duct. The retaining screw ring is driven along the thread of the pipe head to cooperate with the retaining ring to axially squeeze the sealing sleeve, so that the sealing sleeve tightly squeezes the pipe head and the inner wall of the box girder duct in the radial direction.

2. The vacuum-assisted grouting control system according to claim 1, wherein A first vacuum pressure gauge is provided between the grouting pump and the first valve body.

3. The vacuum-assisted grouting control system according to claim 1, wherein A second vacuum pressure gauge is provided between the vacuum pump and the third valve body; A filter is provided between the vacuum pressure gauge and the third valve; 4. The vacuum-assisted grouting control system according to claim 3, wherein, Detachable joints are provided on the rubber tubes at both ends corresponding to the filter.

5. The vacuum-assisted grouting control system according to claim 1, characterized in that The sealing sleeve is made of rubber material.

6. The vacuum-assisted grouting control system according to claim 1, wherein A hexagonal part is provided at the end of the pipe head away from the box girder duct.

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