Tunnel secondary lining concrete pouring method

Abstract

A tunnel secondary lining concrete pouring method belongs to the technical field of railway tunnel secondary lining concrete grouting materials, and comprises the following steps: pumping quantitative concrete to a trolley according to a flow rate through a control center, adjusting the discharging direction of a herringbone pipe through a ball valve, pumping the concrete to the trolley according to a designed volume, and after single-layer construction is finished, pouring concrete into the trolley; the control center automatically adjusts the ball valve to the other side and pumps the concrete into the trolley on the other side through the flow meter according to the designed quantity, layered and segmented automatic pouring of the concrete according to the designed quantity is achieved, the control center synchronously controls the vibrator to vibrate the concrete, automatic pouring and vibrating of the tunnel second lining concrete according to the quantity are achieved, and the production efficiency is improved. The problems of non-uniform concrete distribution, vibration missing and the like are avoided, and the effect is obvious.

Description

Technical Field

[0001] This invention belongs to the technical field of railway tunnel secondary lining concrete grouting material, specifically relating to a method for pouring tunnel secondary lining concrete. Background Technology

[0002] Currently, tunnels are widely used in railway engineering. After tunnel excavation, initial support, waterproofing membrane, and secondary lining concrete construction are carried out. The secondary lining concrete construction has transitioned from manual pumping to remote-controlled placement by a concrete placement trolley. This has resulted in operational difficulties, significant human interference, uneven pouring of secondary lining concrete on both sides, and problems such as cold joints and lateral displacement of the trolley under unilateral stress. This falls short of the high requirements for engineering quality.

[0003] In view of the above problems, a new construction method and tooling are needed to solve the problem of synchronous, automatic and uniform pouring of concrete on both sides of the tunnel secondary lining. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a method for pouring concrete for the secondary lining of tunnels, thereby solving the problem of simultaneous, automatic, and uniform pouring of concrete on both sides of the secondary lining of tunnels.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for pouring secondary lining concrete in tunnels includes the following steps: Step 1: After the secondary lining trolley is in place, connect the control room wiring to the conveying pump control system, concrete flow meter, concrete placing trolley control system, attached vibration system, and immersion vibration system, and test run them; connect the concrete conveying pump to the feeding pump pipe, concrete placing trolley, jacking pipe, herringbone pipe, side-feeding pipe, and discharge pipe. Step 2: After the concrete is mixed, it is transported by tanker truck to the secondary lining concrete pouring location. The control center starts the concrete conveying system, placing system, vibration system, and monitoring system. During the secondary lining pouring, the control room controls the conveying pump to pump a quantitative amount of 30cm concrete from one side to the left secondary lining according to the concrete flow data. After the designed amount of concrete is pumped, the placing trolley closes the ball valve on the left side of the herringbone pipe and closes the left outlet through the hydraulic jack. At the same time, the right outlet of the herringbone pipe is opened simultaneously. The conveying pump is controlled according to the concrete flow data to pump a quantitative amount of 30cm concrete from one side to the right secondary lining. Step 3: Pour concrete into the next pouring port on the right side in a synchronous alternating pouring manner. The pouring sequence for a single layer is to pour concrete from both sides first and then from the middle in a symmetrical alternating pouring manner. After the pouring of this layer is completed, the control room starts the first layer of attached vibrator and vibrates synchronously from both sides, from low frequency to high frequency, with a vibration time frequency of 15s-30s-30s-15s. Step 4: Pour the second, third, and fourth layers of secondary lining concrete using the same method; recover the lateral placing cylinder, and at the same time close the left and right ball valves of the herringbone pipe, open the ball valve of the jacking pipe, and lift the discharge pipe to the arch pouring hole. Step 5: Start the delivery pump in the control room and pour the top according to the design volume. The pouring sequence is from the front end to the back end, pouring from hole to hole. At the same time, control the insertion of the immersion vibrator to vibrate and pour from hole to hole until the last feeding hole. Step 6: When pouring to the last feeding hole, the control room controls the concrete feeding rate. When the concrete can be seen at the visual end form to have been poured to the top of the initial support, the concrete is continuously delivered until the pressure reaches 8 MPa.

[0006] The beneficial effects of this invention are: The method provided by this invention uses a control center to pump a fixed quantity of concrete to a trolley according to the designed flow rate. The discharge direction of the herringbone pipe is adjusted via a ball valve, and the concrete is pumped to the trolley according to the designed volume. After a single layer is completed, the control center automatically adjusts the ball valve to the other side and pumps the designed volume of concrete to the trolley on the other side via a flow meter. This achieves automatic layered and segmented pouring of concrete according to the designed volume. Simultaneously, the control center operates a vibrator to compact the concrete, realizing automatic pouring and compaction of the tunnel secondary lining concrete according to the designed volume. This avoids problems such as uneven concrete distribution and missed vibration, resulting in significant improvements. Attached Figure Description

[0007] Figure 1 A diagram illustrating the process of pouring concrete for the secondary lining of a tunnel. Figure 2 This is a plan view; Figure 3 This is a detailed schematic diagram; Among them, 1 is the control room, 2 is the delivery pump, 3 is the concrete flow meter, 4 is the feeding pump pipe, 5 is the placing trolley, 6 is the hydraulic cylinder, 7 is the jacking pipe, 8 is the herringbone pipe, 9 is the ball valve, 10 is the switch cylinder, 11 is the side feeding pipe, 12 is the feeding pipe, 13 is the immersion vibration system, 14 is the attached vibration system, and 15 is the trolley. Detailed Implementation

[0008] The invention will be further described below with reference to the accompanying drawings.

[0009] like Figure 1 , 2 As shown, a method for pouring concrete for the secondary lining of a tunnel includes the following steps: Step 1: After the secondary lining trolley is in place, connect the control room 1 wiring to the control system of the conveying pump 2, the concrete flow meter 3, the control system of the placing trolley 5, the attached vibration system 14, and the immersion vibration system 13, and test run them; connect the concrete conveying pump to the feeding pump pipe 4, the placing trolley 5, the jacking pipe 7, the herringbone pipe 8, the side-downward feeding pipe 11, and the discharge pipe 12. Step 2: After the concrete is mixed, it is transported by tanker truck to the secondary lining concrete pouring location. The control center starts the concrete conveying system, placing system, vibration system, and monitoring system. During the secondary lining pouring, the control room controls the conveying pump to pump a 30cm volume of concrete from one side to the left secondary lining according to the concrete flow data. After the designed volume of concrete is pumped, the placing trolley 5 closes the ball valve on the left side of the herringbone pipe and closes the left outlet through the hydraulic jack. At the same time, the right outlet of the herringbone pipe is opened simultaneously. The conveying pump is controlled according to the concrete flow data to pump a 30cm volume of concrete from one side to the right secondary lining. Step 3: Pour concrete into the next pouring port on the right side in a synchronous alternating pouring manner. The pouring sequence for a single layer is to pour concrete from both sides first and then from the middle in a symmetrical alternating pouring manner. After the pouring of this layer is completed, the control room starts the first layer of attached vibrator and vibrates synchronously from both sides, from low frequency to high frequency, with a vibration time frequency of 15s-30s-30s-15s. Step 4: Pour the second, third, and fourth layers of secondary lining concrete using the same method; recover the lateral placing cylinder, and at the same time close the left and right ball valves of the herringbone pipe, open the ball valve of the jacking pipe, and lift the discharge pipe to the arch pouring hole. Step 5: Start the delivery pump in the control room and pour the top according to the design volume. The pouring sequence is from the front end to the back end, pouring from hole to hole. At the same time, control the insertion of the immersion vibrator to vibrate and pour from hole to hole until the last feeding hole. Step 6: When pouring to the last feeding hole, the control room controls the concrete feeding rate. When the concrete can be seen at the visual end form to have been poured to the top of the initial support, the concrete is continuously delivered until the pressure reaches 8 MPa.

[0010] like Figure 3 As shown, according to the above method, ball valves 9 are provided on both sides of the herringbone pipe 8, and the ball valves 9 are connected to the switch cylinder; the end is connected to the insertion vibration system 13, and the insertion vibration system 13 and the end of the herringbone pipe 8 are controlled by the cylinder 6.

Claims

1. A method for pouring concrete for the secondary lining of a tunnel, characterized in that, Includes the following steps: Step 1: After the secondary lining trolley is in place, connect the control room wiring to the conveying pump control system, concrete flow meter, concrete placing trolley control system, attached vibration system, and immersion vibration system, and test run them; connect the concrete conveying pump to the feeding pump pipe, concrete placing trolley, jacking pipe, herringbone pipe, side-feeding pipe, and discharge pipe. Step 2: After the concrete is mixed, it is transported by tanker truck to the secondary lining concrete pouring location. The control center starts the concrete conveying system, placing system, vibration system, and monitoring system. During the secondary lining pouring, the control room controls the conveying pump to pump a quantitative amount of 30cm concrete from one side to the left secondary lining according to the concrete flow data. After the designed amount of concrete is pumped, the placing trolley closes the ball valve on the left side of the herringbone pipe and closes the left outlet through the hydraulic jack. At the same time, the right outlet of the herringbone pipe is opened simultaneously. The conveying pump is controlled according to the concrete flow data to pump a quantitative amount of 30cm concrete from one side to the right secondary lining. Step 3: Pour concrete into the next pouring port on the right side in a synchronous alternating pouring manner. The pouring sequence for a single layer is to pour concrete from both sides first and then from the middle in a symmetrical alternating pouring manner. After the pouring of this layer is completed, the control room starts the first layer of attached vibrator and vibrates synchronously from both sides, from low frequency to high frequency, with a vibration time frequency of 15s-30s-30s-15s. Step 4: Pour the second, third, and fourth layers of secondary lining concrete using the same method; recover the lateral placing cylinder, and at the same time close the left and right ball valves of the herringbone pipe, open the ball valve of the jacking pipe, and lift the discharge pipe to the arch pouring hole. Step 5: Start the delivery pump in the control room and pour the top according to the design volume. The pouring sequence is from the front end to the back end, pouring from hole to hole. At the same time, control the insertion of the immersion vibrator to vibrate and pour from hole to hole until the last feeding hole. Step 6: When pouring to the last feeding hole, the control room controls the concrete feeding rate. When the concrete can be seen at the visual end form to have been poured to the top of the initial support, the concrete is continuously delivered until the pressure reaches 8 MPa.

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