PCCP (prestressed concrete cylinder pipe) excavation and repair supporting device and using method thereof

Abstract

The invention discloses a PCCP excavation repair supporting device which comprises a base and an elastic steel sheet, supporting parts are hinged to the two ends of the elastic steel sheet, mounting blocks are hinged to the ends, away from the elastic steel sheet, of the supporting parts and slide in the base, a bidirectional lead screw is connected to the base in a threaded mode, and the mounting blocks are connected with different threads of the bidirectional lead screw in a threaded mode. By means of the pipeline supporting device, the pipeline supporting device can be conveniently placed into the bottom of a pipeline in an excavated pit, the excavation depth of the pipeline is reduced, the construction progress is increased, and the pipeline supporting device can be matched with the radian of the outer wall of the pipeline according to the size of the pipeline needing to be supported.

Description

Technical Field

[0001] The present invention relates to the technical field of PCCP pipeline excavation and repair, and specifically relates to a PCCP pipeline excavation and repair support device and a method for using the same. Background Art

[0002] With the large-scale rise of water conservancy projects in my country, PCCP has been widely used in my country due to its superior characteristics. However, in the long-term operation of PCCP, due to environmental corrosion, hydrogen embrittlement, pipe manufacturing errors, pipeline installation and construction, material defects and other factors, PCCP prestressed steel wires will break. If they cannot be discovered and repaired in time, it is very likely to cause a pipe burst accident during the operation of PCCP, causing huge economic losses and social impacts.

[0003] Common repair and reinforcement methods include excavation repair and trenchless repair. Excavation repair mainly includes post-tensioning method, external concrete method, etc. The post-tensioning method refers to re-tensioning the prestress outside the broken wire pipe, and then spraying a protective layer outside the steel wire. Although this method can be used to reinforce the pipeline structure without stopping water, the construction process is complicated. For example, to reinforce a single pipe, it is necessary to consider the stress conditions of the pipes on both sides and the treatment of the tensioning joints; the external concrete method refers to wrapping a new layer of reinforced concrete outside the damaged pipe, but it produces uneven structure and stiffness along the axial direction of the pipe. It is only suitable for reinforcing earthquake-damaged pipes and small-diameter pipes damaged by uneven settlement. Trenchless repair methods mainly include internal steel lining method and internal CFRP lining reinforcement method. The steel plate lining method is to insert a steel tube as a lining into the damaged pipe, then restore the steel tube to a similar circular shape as the damaged pipe and weld it, and finally pour mortar between the lining and the damaged pipe. The pipes reinforced by this method have good durability, but water supply needs to be interrupted during the repair process. It is suitable for reinforcing longer pipe sections, and it is not economical to reinforce a single pipe. The CFRP lining reinforcement method is to paste fiber fabric inside the pipe. The number of layers and direction of paste depend on the damage of the pipe. Although this repair and reinforcement method does not require excavation and does not affect the traffic around the pipe, it requires water suspension during the repair period, large-area reinforcement takes a long time, and sufficient time is required after the CFRP is pasted to ensure the bonding strength. Overall, since PCCP is mostly used for long-distance water supply mains, water suspension maintenance will seriously affect the daily water use of urban residents. Therefore, PCCP repair currently adopts the excavation without water suspension repair method.

[0004] After searching, the patent number of CN 110332412 B is a broken wire PCCP excavation repair support device and a construction method thereof, in which a curved steel sheet bracket and two jacks are combined to support the pipeline. The curved steel sheet bracket causes an arc shape, which makes it inconvenient to install it to the bottom of the pipeline, and the excavation work before installation is cumbersome, affecting the construction progress. In addition, the curvature of the curved steel sheet bracket is fixed, and it cannot effectively support pipelines of different sizes, so it needs to be improved. Summary of the invention

[0005] The object of the present invention is to provide a PCCP pipeline excavation and repair support device and a method of using the same to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a PCCP pipeline excavation and repair support device, comprising a base and an elastic steel sheet, support components are hinged at both ends of the elastic steel sheet, and a mounting block is hinged at the end of the support component facing away from the elastic steel sheet, and the mounting block slides in the base, a bidirectional lead screw is screwed on the base, and the mounting block is screwed with different threads of the bidirectional lead screw respectively, and is used to prop up the elastic steel sheet, and a support block is installed on the mounting block to make the support component tend to rotate upward.

[0007] Preferably, the contact surface between the support block and the support component is an inclined surface, and the two support blocks are positioned opposite to each other to tilt the support component upward. The connection between the support block and the mounting block is lower than the bottom of the inclined surface to avoid affecting the rotation of the support component.

[0008] Preferably, the length of the elastic steel sheet is less than 1 / 3 of the circumference of the pipeline.

[0009] Preferably, the bidirectional lead screw passes through the base and extends to the outside, and a connecting joint is installed at the extended end of the bidirectional lead screw, and the bidirectional lead screw is driven to rotate manually by a tool or automatically by a driving device.

[0010] Preferably, a stopper is installed on the top surface of the elastic steel sheet near the hinge with the supporting component, and the stopper contacts and supports the surface of the pipeline after the elastic steel sheet supports the pipeline to bend.

[0011] A method for using a PCCP pipeline excavation and repair support device comprises the following steps:

[0012] S1. First, check that the elastic steel sheet in the PCCP pipeline excavation and repair support device is in a relatively straight state, and reduce the overall height of the PCCP pipeline excavation and repair support device;

[0013] S2, sending the PCCP pipeline excavation repair support device to the bottom of the pit of the excavated PCCP pipeline section where the wire is broken, so that the PCCP pipeline excavation repair support device is placed at the lower end of the pipeline, and the middle part of the elastic steel sheet corresponds to the bottom of the pipeline;

[0014] S3. Connect the connector with a manual tool or a drive motor to drive the bidirectional lead screw to rotate, drive the two mounting blocks to move in the same direction in the base, bend the elastic steel sheet under the action of the support block, and drive the support component to rotate upward, so that the elastic steel sheet rises until the top surface of the elastic steel sheet and the block fit tightly with the surface of the pipe, completing the pipe support.

[0015] Preferably, the pit bottom of the PCCP pipe section where the wire is broken in S2 needs to be compacted to increase the supporting force of the pit bottom, and the pit bottom is flat so that the forces on both ends of the elastic steel sheet are evenly distributed, and the distance between the compacted pit bottom and the bottom surface of the pipe is sufficient to allow the base to pass smoothly.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the present invention can be conveniently placed at the bottom of the pipeline in the excavated pit, and the depth of pipeline excavation is reduced, the construction progress is increased, and the present invention can adapt the curvature of the outer wall of the pipeline according to the size of the pipeline to be supported. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a cross-sectional view of the internal structure of the base of the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the present invention in a pipeline supporting state.

[0020] In the figure: 1-base, 2-elastic steel sheet, 3-support component, 4-mounting block, 5-bidirectional screw, 6-support block, 7-connecting joint, 8-stop block. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1-3The present invention provides a technical solution: a PCCP pipeline excavation and repair support device, comprising a base 1 and an elastic steel sheet 2, support components 3 are hinged at both ends of the elastic steel sheet 2, and a mounting block 4 is hinged at the end of the support component 3 away from the elastic steel sheet 2, and the mounting block 4 slides in the base 1, a bidirectional screw 5 is screwed in the base 1, and the mounting block 4 is screwed with different threads of the bidirectional screw 5 for propping up the elastic steel sheet 2, and a support block 6 is installed on the mounting block 4 to make the support component 3 rotate upward.

[0023] The elastic steel sheet 2 and the supporting component 3 are located inside the base 1 in the initial position.

[0024] The supporting member 3 may be of a fixed length or of an adjustable length.

[0025] The contact surface between the support block 6 and the support component 3 is an inclined surface, and the two support blocks 6 are symmetrically arranged to make the support component 3 tilt upward, and the connection between the support block 6 and the mounting block 4 is lower than the bottom of the inclined surface.

[0026] The length of the elastic steel sheet 2 is less than 1 / 3 of the circumference of the pipeline.

[0027] The bidirectional lead screw 5 passes through the base 1 and extends to the outside, and a connecting joint 7 is installed at the extended end of the bidirectional lead screw 5. The bidirectional lead screw 5 is driven to rotate manually by a manual tool or automatically by a driving device.

[0028] A stopper 8 is installed on the top surface of the elastic steel sheet 2 near the hinge with the supporting component 3. After the elastic steel sheet 2 supports the pipe to bend, the stopper 8 contacts and supports the pipe surface.

[0029] The elastic steel sheet 2 may be spring steel.

[0030] A method for using a PCCP pipeline excavation and repair support device comprises the following steps:

[0031] S1. Inspection before use: First, check that the elastic steel sheet 2 in the PCCP pipeline excavation and repair support device is in a relatively straight state to reduce the overall height of the PCCP pipeline excavation and repair support device;

[0032] S2. Treatment of the excavated pit: The PCCP pipeline excavation and repair support device is sent to the bottom of the pit of the pipe section of the excavated PCCP pipeline where the wire is broken, and the pit bottom needs to be compacted to increase the support force of the pit bottom, and the pit bottom is a horizontal plane, so that the two ends of the elastic steel sheet are evenly stressed, wherein the distance between the compacted pit bottom and the bottom surface of the pipeline can allow the base to pass (that is, the distance between the compacted pit bottom and the bottom surface of the pipeline matches the thickness of the base), so that the PCCP pipeline excavation and repair support device is placed at the lower end of the pipeline, and the middle part of the elastic steel sheet 2 corresponds to the bottom of the pipeline;

[0033] S3. Support operation: connect the connector 7 through a manual tool or a driving motor, turn the manual tool or start the driving motor to drive the bidirectional screw 5 to rotate, and the bidirectional screw 5 drives the two mounting blocks 4 to move in the same direction in the base 1. Under the action of the supporting block 6, the two supporting components 3 rotate upward and approach each other, forcing the elastic steel sheet 2 to bend, and drive the elastic steel sheet 2 to rise until the top surface of the elastic steel sheet 2 and the stop block 8 are tightly fitted with the surface of the pipeline, completing the pipeline support.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PCCP pipeline excavation and repair support device, characterized by: It includes a base and an elastic steel sheet, both ends of the elastic steel sheet are hinged with supporting components, the end of the supporting component facing away from the elastic steel sheet is hinged with a mounting block, and the mounting block slides in the base, a bidirectional lead screw is threaded in the base, and the mounting blocks are respectively threaded with different threads of the bidirectional lead screw for propping up the elastic steel sheet, and a support block is installed on the mounting block to make the supporting component tend to rotate upward.

2. The PCCP pipeline excavation and repair support device according to claim 1 is characterized in that: The contact surface between the support block and the support component is an inclined surface, and the two support blocks are symmetrically arranged to make the support component tilt upward, and the connection between the support block and the mounting block is lower than the bottom of the inclined surface.

3. The PCCP pipeline excavation and repair support device according to claim 1 is characterized in that: The length of the elastic steel sheet is less than 1 / 3 of the circumference of the pipeline.

4. The PCCP pipeline excavation and repair support device according to claim 1 is characterized in that: The bidirectional lead screw passes through the base and extends to the outside, and a connecting joint is installed at the extended end of the bidirectional lead screw, and the bidirectional lead screw is driven to rotate manually by a manual tool or automatically by a driving device.

5. The PCCP pipeline excavation and repair support device according to claim 1 is characterized in that: A stopper is installed on the top surface of the elastic steel sheet near the hinge with the supporting component. After the elastic steel sheet supports the pipe to bend, the stopper contacts and supports the pipe surface.

6. The method for using the PCCP pipeline excavation and repair support device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. First, check that the elastic steel sheet in the PCCP pipeline excavation and repair support device is in a relatively straight state, and reduce the overall height of the PCCP pipeline excavation and repair support device; S2, sending the PCCP pipeline excavation repair support device to the bottom of the pit of the excavated PCCP pipeline section where the wire is broken, so that the PCCP pipeline excavation repair support device is placed at the lower end of the pipeline, and the middle part of the elastic steel sheet corresponds to the bottom of the pipeline; S3. Connect the connector with a manual tool or a drive motor, turn the manual tool or start the drive motor to drive the bidirectional lead screw to rotate, and the bidirectional lead screw drives the two mounting blocks to move in the same direction in the base. Under the action of the support block, the two support components rotate upward and approach each other, forcing the elastic steel sheet to bend and drive the elastic steel sheet to rise until the top surface of the elastic steel sheet and the block fit tightly with the surface of the pipe, completing the pipe support.

7. The method for using the PCCP pipeline excavation and repair support device according to claim 6, characterized in that: The bottom of the pit where the PCCP pipe is broken in S2 needs to be compacted to increase the support force of the bottom of the pit. The bottom of the pit is flat so that the forces on both ends of the elastic steel sheet are evenly distributed. The distance between the compacted bottom of the pit and the bottom of the pipe is sufficient to allow the base to pass smoothly.

Images