CN110924954A

CN110924954A - Device and method for checking grouting condition of annular space of orifice pipe

Info

Publication number: CN110924954A
Application number: CN201911265914.XA
Authority: CN
Inventors: 喻伟; 陆正; 龚毅; 王凯
Original assignee: Shanghai Foundation Engineering Group Co Ltd
Current assignee: Shanghai Foundation Engineering Group Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-03-27

Abstract

The invention relates to a device and a method for checking grouting condition of an annular space of an orifice pipe, wherein the annular space is formed between the orifice pipe and a freezing pipe of the device, and a bypass valve is additionally arranged on the orifice pipe to observe leakage condition, so that whether grouting is full in the annular space or not and whether crack or not exists after a grouting body is placed for a long time can be judged; the annular space is communicated with the grouting pipeline and grouting equipment through the bypass valve, and the holes in the annular space are reinforced and filled through grouting of the bypass valve, so that the leakage risk of construction cutting of the freezing pipe can be greatly avoided. The method comprises the following steps: 1) installing a bypass valve; 2) a hole is formed in the bypass valve; 3) observing the leakage condition of the inner hole of the valve; 4) connecting grouting equipment pipelines, performing a water injection test without leakage, and performing grouting reinforcement with leakage; 5) opening the hole after the slurry is solidified and then checking; 6) after confirming that no leakage exists, the construction of cutting the freezing pipe can be carried out. The invention can effectively reduce the risk of water leakage during cutting construction of the frozen pipe of the communication channel and improve the safety of pipe cutting construction.

Description

Device and method for checking grouting condition of annular space of orifice pipe

Technical Field

The invention relates to a shield tunnel connection channel construction device, in particular to a device and a method for checking grouting condition of an orifice pipe annular space.

Background

Along with the continuous expansion of city scale, especially central big city, the demand of subway construction is more and more, and the contact passageway of subway tunnel lays also more and more. The connection channel is used as a key risk point in subway tunnel construction, and half-point flash loss cannot occur in details of each construction procedure. The normal operation of the subway tunnel is related to the development process of the whole city.

The cutting of the freezing pipe is an important process for the freezing method construction of the communication channel. However, many construction sites lack safe, effective and targeted protection for the inspection process before pipe cutting, thereby causing immeasurable consequences and loss. Therefore, a safety inspection measure method before freezing pipe cutting is provided aiming at the possible risk during freezing pipe cutting construction, which is urgently needed for reducing the construction risk, eliminating the construction hidden danger and improving the construction quality of the subway tunnel engineering.

Disclosure of Invention

In order to solve the problem of risk hidden danger before freezing pipe cutting, the invention provides a device and a method for checking the grouting condition of an annular space of an orifice pipe.

In order to achieve the purpose, the technical scheme of the invention is as follows: a device for checking grouting conditions of an annular space of an orifice pipe comprises a bypass valve, a grouting pipeline and grouting equipment, wherein an annular space is formed between the orifice pipe and a freezing pipe, the orifice pipe is additionally provided with the bypass valve and communicated with the annular space for observing leakage conditions, and whether grouting in the annular space is full or not and whether crack or not exists after the grouting body is placed for a long time can be judged; the annular space is communicated with the grouting pipeline and grouting equipment through the bypass valve, and the holes in the annular space are reinforced and filled through grouting of the bypass valve, so that the leakage risk of construction cutting of the freezing pipe can be greatly avoided.

Furthermore, 1-2 bypass valves are additionally arranged on the orifice pipe and are arranged at an angle of 90 degrees with the original bypass valves.

A construction method adopting a device for checking grouting conditions of an annular space of an orifice pipe comprises the following specific construction steps: 1) installing a bypass valve; 2) a hole is formed in the bypass valve; 3) observing the leakage condition of the inner hole of the valve; 4) connecting grouting equipment pipelines, performing a water injection test without leakage, and performing grouting reinforcement with leakage; 5) opening the hole after the slurry is solidified and then checking; 6) after confirming that no leakage exists, the construction of cutting the freezing pipe can be carried out.

The invention has the beneficial effects that:

the construction technology can ensure construction safety during cutting construction of the freezing pipe, reduce the risk of water burst and sand burst of the tunnel during pipe cutting construction, avoid damage, settlement and deformation of the tunnel structure caused by sudden leakage, and further reduce fatal risk factors such as soil body loss, surface settlement, pipeline structure cracking and the like caused by leakage of the communication channel.

Drawings

FIG. 1 is a schematic view of an annular space bypass valve installation of the present invention;

FIG. 2 is a cross-sectional view of an annulus bypass valve slurry fill of the present invention;

FIG. 3 is an annular space grouting diagram;

FIG. 4 is a view of annular space void inspection and filling;

fig. 5 is a left side view of fig. 4.

Detailed Description

The invention is further described with reference to the following figures and examples.

As shown in fig. 1 to 5, an apparatus for inspecting grouting condition of an annular space of an orifice pipe for inspecting the condition of grouting filling of the annular space and a joint for connecting grouting pipes as a supplementary grouting. The device comprises a bypass valve 3, an electric welding machine, a grouting joint, a grouting pipeline, grouting equipment, slurry mixing equipment, cement and water glass. An annular space is arranged between the orifice pipe 1 and the freezing pipe 2, the annular space is communicated with a grouting pipeline and grouting equipment through a plurality of bypass valves 3,

(1) the leakage condition is observed by adding the bypass valve 3 on the orifice pipe 1, so that whether grouting in the annular space is full or not and whether crack or not exists after the grouting body is placed for a long time can be judged.

(2) Through reinforcing the grouting 4 of the bypass valve 3, the holes in the annular space are filled, and the leakage risk of cutting off construction of the freezing pipe is greatly avoided.

The concrete construction steps of the invention are as follows:

because of the freezing method reinforcement construction condition, the freezing pipe 2 and the orifice pipe 1 are placed for a long time, the annular grouting body is likely to deform to generate cracks, and before the freezing pipe 2 is cut into pipes, the annular space gap needs to be checked and confirmed and grouting reinforcement is carried out, so that the leakage risk caused by pipe cutting construction is reduced. The invention also discloses the device.

And after the freezing construction is finished, removing the rubber hose on the freezing pipe 2. 1-2 bypass valves 3 are additionally arranged on the orifice pipe 1 to be cut off and are arranged at an angle of 90 degrees with the original bypass valves (when a space condition exists, the bypass valves are uniformly arranged);

(1) punching a small opening on the orifice pipe from the bypass valve 3 by using electric welding to observe whether water leaks (or observing by drilling a plurality of holes by using an electric hand drill);

(2) if no leakage exists, the grouting equipment and the pipeline are connected to the bypass valve 3, the pressure is tested by using clear water, if water does not enter the annular space, the annular space can be judged to be grouted compactly, and the annular space enters a pipe cutting and hole sealing process; if water can be pressed in, supplementary grouting is needed;

(3) if leakage occurs, the annular space is supplemented and grouted through the bypass valve 3 (grouting mode: firstly single-liquid grout is grouted to penetrate into the annular space, then double-liquid grout is grouted to accelerate solidification, the mixing ratio of the single-liquid grout and the double-liquid grout is 1:1 cement-water-glass solution volume ratio, wherein the cement-water-cement ratio is 1:1)

(4) After the filling mortar is solidified, a hole is drilled at the root of the orifice pipe by using an electric hand drill, and whether water leakage exists is observed. If no leakage exists, the risk is judged to be eliminated, and the process of cutting the pipe and sealing the hole can be carried out.

Claims

1. The utility model provides a be used for to orifice pipe annular space slip casting condition inspection device, includes bypass valve, slip casting pipeline, grouting equipment, its characterized in that: an annular space is formed between the orifice pipe and the freezing pipe, the orifice pipe is additionally provided with a bypass valve and is communicated with the annular space for observing the leakage condition, and whether grouting is full in the annular space or not and whether crack or not exists after the grouting body is placed for a long time can be judged; the annular space is communicated with the grouting pipeline and grouting equipment through the bypass valve, and the holes in the annular space are reinforced and filled through grouting of the bypass valve, so that the leakage risk of construction cutting of the freezing pipe can be greatly avoided.

2. The apparatus for inspecting grouting conditions in an annulus of an orifice pipe as claimed in claim 1, wherein: and 1-2 bypass valves are additionally arranged on the orifice pipe and are arranged at an angle of 90 degrees with the original bypass valves.

3. A construction method adopting the device for checking grouting condition of the orifice pipe annular space as claimed in claim 1 or 2 is characterized by comprising the following specific construction steps: 1) installing a bypass valve; 2) a hole is formed in the bypass valve; 3) observing the leakage condition of the inner hole of the valve; 4) connecting grouting equipment pipelines, performing a water injection test without leakage, and performing grouting reinforcement with leakage; 5) opening the hole after the slurry is solidified and then checking; 6) after confirming that no leakage exists, the construction of cutting the freezing pipe can be carried out.