CN218716839U

CN218716839U - Double-liquid mixing mechanism suitable for synchronous grouting of shield tunnel

Info

Publication number: CN218716839U
Application number: CN202223010706.5U
Authority: CN
Inventors: 黄伟; 王玉龙; 王晓虎; 周军峰; 胡涛; 张斐斐; 朱映丞; 周维宝; 吴保平; 张建; 典军伟; 王金
Original assignee: Chengdu Rail Transit Construction Management Co Ltd; China Railway Tunnel Stock Co Ltd
Current assignee: Chengdu Rail Transit Construction Management Co Ltd; China Railway Tunnel Stock Co Ltd
Priority date: 2022-11-12
Filing date: 2022-11-12
Publication date: 2023-03-24
Anticipated expiration: 2032-11-12

Abstract

The application discloses biliquid mixing mechanism suitable for synchronous slip casting of shield tunnel through close valve and inspection pipeline, solves among the prior art mixing mechanism and easily blocks up and can't judge the technical problem of jam point. The device comprises a main pipeline with an upstream port as a liquid A inlet, and a branch pipeline communicated with a corresponding position at the downstream of the main pipeline and used for pumping liquid B, wherein the branch pipeline is sequentially provided with a one-way valve and a closing valve from upstream to downstream; the check valve is characterized by further comprising a check pipeline correspondingly communicated with the pipeline between the one-way valve and the closed valve, and the check pipeline is provided with a check valve. The mechanism has the advantages of easy judgment and dredging of the blockage point, low cost, high efficiency and the like.

Description

Double-liquid mixing mechanism suitable for synchronous grouting of shield tunnel

Technical Field

The application relates to the technical field of shield construction equipment, in particular to a double-liquid mixing mechanism suitable for synchronous grouting of a shield tunnel.

Background

In the shield tunneling process, the outer diameter of a cutter head of the shield is larger than the outer diameter of a lining segment, a shield shell has certain thickness, and the phenomenon of overexcavation and the like exists in the tunneling process, so that an annular gap can appear between the segment and a stratum after a shield tail is separated from the segment, the soil body around the segment is in a non-support state at the moment, and the gap is the tunneling gap. The thickness of the excavation gap is generally between 10 and 20cm, after the excavation gap is formed, the soil stress around the pipe piece begins to be gradually released, the stratum also begins to be slowly settled, if measures are not taken to fill the excavation gap in time, the accumulated water in the gap is increased, the water leakage of the pipe piece is possibly caused, the ground surface settlement is over-limit, and the adverse effect on surrounding buildings is caused in the urban tunnel construction. Therefore, in actual shield tunnel engineering, a synchronous grouting technology is generally adopted to fill the excavation gap.

The synchronous grouting technology is that when the shield is pushed forward and an excavation gap is formed, a synchronous system injects a slurry material with proper early strength and final strength from a grouting hole at the tail of the shield according to specified grouting amount and grouting pressure to fill the gap, so that the soil body around the segment is supported in time, the deformation and collapse of the soil body are effectively prevented, and the surface subsidence is controlled. A grouting system of the shield machine is basically provided with a slurry tank for stirring slurry and slurry delivery pumps meeting the number of grouting points, and synchronous grouting is performed on the back of the pipe piece through instruction operation on a control panel.

The commonly used grouting slurry in shield tunnel construction at present is roughly divided into a single-liquid grouting material and a double-liquid grouting material. The double-liquid slurry is prepared by pumping A slurry and B slurry through two pipelines, mixing and injecting the slurry into an excavation gap, wherein the A slurry is a cement-based material, the B slurry is usually water glass or a high polymer material and serves as a hardening agent, and the mixed slurry can be quickly solidified or the fluidity of the slurry is quickly reduced, so that the shield tail is effectively filled, and the ground surface settlement and the pipe piece floating are controlled.

The inventor knows that a shield constructs double fluid thick liquid slip casting joint (CN 103982198A) discloses through wherein both ends mouth and the thick liquid that waits to mix communicates respectively, and another port is used for discharging the cavity three-way pipe that mixes the thick liquid, but the inventor of this application in the in-process of realizing this application embodiment technical scheme, finds that above-mentioned technique because synchronous slip casting AB liquid mixes back gelatinization time shorter, after the shield constructs the machine and breaks out and then stops the slip casting, pipeline jam is easily caused at the mixed point to remaining thick liquid in the pipeline, and can't judge after the jam that the jam point is located pipeline position, and then delay the construction progress.

The information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

Disclosure of Invention

In view of at least one of above technical problem, this disclosure provides a biliquid mixing mechanism suitable for shield tunnel synchronous slip casting, through close valve and inspection pipeline, solves among the prior art mixing mechanism and easily blocks up and can't judge the technical problem of jam point.

According to one aspect of the disclosure, a double-liquid mixing mechanism suitable for synchronous grouting of a shield tunnel is provided, which comprises a main pipeline with an upstream port as a liquid A inlet, and a branch pipeline communicated with a corresponding position at the downstream of the main pipeline and used for pumping liquid B, wherein the branch pipeline is sequentially provided with a one-way valve and a closing valve from the upstream to the downstream;

the check valve is characterized by further comprising a check pipeline correspondingly communicated with the pipeline between the one-way valve and the closed valve, and the check pipeline is provided with a check valve.

In some embodiments of the present disclosure, the main pipe is provided with a branch interface for communicating with the branch pipe.

In some embodiments of the present disclosure, the main pipe is provided with a main pipe tee for communicating with the branch pipes.

In some embodiments of the present disclosure, the check valve is embodied as a large diameter steel ball spring check valve.

In some embodiments of the present disclosure, the inspection pipe and the branch pipe are in corresponding communication through a branch tee.

In some embodiments of the present disclosure, the closing valve and/or the check valve is a manual ball valve.

One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

1. because the inspection pipeline and the corresponding closing valve and the inspection valve are additionally arranged, the blockage position of the mixing mechanism can be judged by opening the inspection valve and correspondingly opening or closing the closing valve and judging whether the liquid A or the liquid B flows out correspondingly from the inspection port, and the technical problem that the blockage position cannot be accurately judged in the prior art is solved.

2. After judging the jam point that corresponds through the inspection opening, through opening or closing the closing valve, the accessible lasts and corresponds A liquid or B liquid that the pump sending has certain pressure, relies on liquid pressure, realizes the mediation to blockking up the point position, very big improvement maintenance efficiency, has avoided consumeing longer engineering time and has influenced the construction progress.

3. The setting of closing valve makes mixing arrangement can be used to the independent slip casting of A liquid, closes just shutoff B liquid passageway behind the closing valve for main pipe low reaches export has only A liquid pump to send out, has improved the suitability of device.

4. Because the check valve adopts the major diameter steel ball formula spring check valve, the possibility that the valve body blockked up can be reduced to a certain extent to great interior assembly characteristic in this valve body, further guarantees the unobstructed of valve body.

Drawings

Fig. 1 is a schematic structural diagram of a two-fluid mixing mechanism in an embodiment of the present application.

FIG. 2 is a partial cross-sectional view of a check valve in a two-fluid mixing mechanism according to an embodiment of the present application.

In the above figures, 1 is a main pipeline, 2 is a one-way valve, 20 is a valve housing, 21 is a steel ball, 22 is a spring, 3 is a closing valve, 4 is an inspection valve, 5 is a branch three-way pipe fitting, A is an A liquid injection port, B is a B liquid injection port, C is a mixed liquid/A liquid outlet, and D is an inspection port.

Detailed Description

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. The term "connected" and "coupled" when used in this application includes both direct and indirect connections (couplings), unless otherwise specified.

The components and the like in the following examples are all conventional commercially available products unless otherwise specified.

For better understanding of the technical solutions of the present application, the technical solutions will be described in detail below with reference to the drawings and specific embodiments.

The embodiment discloses a double-liquid mixing mechanism suitable for synchronous grouting of a shield tunnel, and the double-liquid mixing mechanism comprises a main pipeline 1, branch pipelines, a check valve 2 and a closing valve 3 which are arranged in the branch pipelines, an inspection pipeline arranged between the check valve 2 and the closing valve 3 of the branch pipelines, and an inspection valve 4 arranged in the inspection pipeline, and is shown in figure 1.

The inlet of A liquid is regarded as to the one end of trunk line 1, and mainly used pump sending A liquid and AB mixing thick liquid, for reaching the purpose that AB liquid mixes, this trunk line is equipped with the branch pipeline interface for the intercommunication branch pipeline, through branch pipeline to 1 interior pump sending B liquid of main line, carries out the mixture of A, B liquid at this main line and branch pipeline inner space intersection, then under the thick liquid pressure, flows from the other end of trunk line, carries out synchronous slip casting to section of jurisdiction postspace. In this embodiment, liquid a is the cement-based material, and liquid B is water glass class material hardener, and considering the proportion requirement that two liquid mix, liquid a accounts for than heavier in mixed thick liquid, so the diameter of trunk line 1 is greater than the diameter of branch pipeline to preliminary adaptation mixes the proportion demand of thick liquid, avoids because the difficult problem of control of the proportion of mixing that leads to of branch pipeline diameter is great. In some other embodiments, in order to communicate the branch pipe with the main pipe, a main pipe tee is provided at a position where the two are combined, and the tee comprises a transverse channel with two ends connected with the main pipe by flanges and the same diameter as the main pipe, and a small-diameter vertical channel for corresponding connection with the branch pipe.

Referring to fig. 1, the upstream of the branch pipe corresponds to an injection port for B liquid, and is communicated with the main pipe 1 after passing through the check valve 2 and the closing valve 3 in sequence. Because of the inside case that is used for controlling the one-way circulation of fluid that is equipped with of check valve, the spatial structure of case must lead to the certain degree of hindrance to its fluid that passes through, and lead to remaining of fluid in the case, consequently, in order to make B liquid can be unobstructed via check valve 2, so in this embodiment, check valve 2 adopts major diameter steel ball formula spring check valve, see fig. 2, this check valve 2 mainly includes outside valve casing 20, locate inside steel ball 21 of valve casing 20 and spring 22, both ends are equipped with the shoulder respectively about its valve casing, be used for card to establish steel ball 21 and spring 22 respectively, reduce upper portion port diameter, make steel ball 21 can carry out the shutoff to the upper portion port, and the lower part shoulder is as the supporting part of spring 22, provide the holding power of spring. Therefore, when no liquid pressure is applied to the upper inlet of the check valve 2, the spring 22 in the valve shell 20 pushes the steel ball to effectively block the inlet of the check valve, even if the lower port is filled with pressurized fluid, the steel ball further blocks the upper port under the action of the pressurized fluid to ensure that liquid cannot flow from the lower end to the upper end of the check valve, only when the upper port is filled with the pressurized fluid, the steel ball 21 pushes the spring under the pressure, the steel ball moves downwards to form a flow channel between the steel ball and the shoulder on the valve shell, and the check valve is opened, so that the one-way conduction effect of the check valve is realized, and due to the adoption of the large-diameter check valve, the steel ball and the spring are only arranged in the valve core, and the effect of reducing the blocking of the check valve part is achieved through a simple structure and a relatively abundant space. In addition, in this embodiment, the closing valve is a manual ball valve, which can control the opening and closing degree of the valve body through the rotation angle of the valve handle, and can fully open and fully close the valve, thereby adjusting the mixing amount of the liquid B into the main pipe 1 and controlling the mixing between the liquid a and the liquid B.

In order to check and judge the blockage position of the mixing mechanism, a check pipeline and a corresponding check valve 4 are arranged, referring to fig. 1, one end of the check pipeline is connected between the branch pipeline check valve 2 and the closing valve 3 through a branch three-way pipe 5, the other end of the check pipeline is used as a check port, and the blockage position of the mixing mechanism is judged by judging the slurry flowing out of the port.

When the mixing mechanism takes place to block up, for confirming concrete jam position, at first, stop B liquid pump sending, close closing valve 3, continue to pump into area A liquid in the trunk line, judge from the exit position department of trunk line whether there is A liquid to correspond to discharge, alright confirm whether the trunk line takes place to block up: if the liquid A cannot be discharged from the outlet of the main pipeline, the main pipeline is blocked, the pumping pressure of the liquid A can be increased within a safety range, and the pressure of the liquid A pushes the blocked part to dredge; if liquid A is normally discharged at the outlet of the main pipeline, the main pipeline is not blocked, and after grouting is stopped, the liquid A can enter the branch pipeline under pumping pressure and is mixed with the liquid B to form gel, so that whether the branch pipeline is blocked or not needs to be checked. For the inspection of branch pipeline, under the condition that main pipeline A liquid is continuously pumped, open closing valve 3 for A liquid gets into branch pipeline via closing valve, opens inspection valve 4 simultaneously, observes that whether there is A liquid to flow out at the export D position of inspection pipeline, if there is A liquid outflow observation outflow: if the liquid A is only the liquid A, the downstream part of the branch pipeline check valve is not blocked; if the effluent is the liquid A doped with the plugging block, the downstream part of the branch pipeline check valve is plugged, but the plugged part is discharged through the inspection port under the pushing of the pressure of the liquid A, so that the pipeline dredging effect is achieved. Finally, if the discharge of the inspection port is only the liquid A, whether the branch pipeline check valve 2 is blocked or not needs to be further judged, at the moment, the branch pipeline closing valve 3 is closed, the liquid B is pumped into the branch pipeline, at the moment, the inspection port is continuously observed, if the discharge of the port is the liquid A, the liquid A is transited to the liquid AB, and then the liquid B is transited, the check valve is not blocked, and the residual liquid A in the branch pipeline is cleaned and purified under the pressure of the liquid B, so that the branch pipeline and the inspection pipeline are prevented from being blocked by fast gelling after the liquid A and the liquid B are mixed; if the liquid B does not flow out from the inspection port, the check valve is blocked, and the check valve needs to be treated.

When the mixing mechanism normally mixes the liquid A and the liquid B, the closing valve is opened and the check valve is closed separately to form a smooth branch pipeline channel. When grouting is stopped, in order to avoid mixing of the liquid A and the liquid B, the liquid B is firstly stopped from being pumped, and the closing valve is firstly closed before the liquid B is stopped from being pumped, so that the liquid A is prevented from reversely crossing a branch pipeline, the formation of a plugging block is avoided, and then the liquid B is stopped from being pumped. In order to further avoid the blockage in the branch pipeline, clear water can be pumped into the branch pipeline after the liquid B stops pumping, the branch pipeline is cleaned, and the check valve can be opened for discharging cleaned objects because the closing valve is closed at the moment, so that the blockage after grouting is stopped in the branch pipeline is avoided.

In addition, after the closing valve is closed, the main pipeline can be used as a liquid pump inlet pipeline A to perform single-liquid synchronous grouting, so that the applicability of the device is increased, and the synchronous grouting requirement of the existing single liquid and mixed liquid can be met.

While certain preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the present application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the invention in the present application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A double-liquid mixing mechanism suitable for synchronous grouting of a shield tunnel is characterized by comprising a main pipeline and a branch pipeline, wherein an upstream port is used as a liquid A inlet, the branch pipeline is communicated with a corresponding position at the downstream of the main pipeline and is used for pumping liquid B, and the branch pipeline is sequentially provided with a one-way valve and a closing valve from upstream to downstream;

2. The dual-liquid mixing mechanism suitable for synchronous grouting of a shield tunnel according to claim 1, wherein the main pipeline is provided with a branch interface for communicating with the branch pipeline.

3. The dual-fluid mixing mechanism suitable for synchronous grouting of a shield tunnel according to claim 1, wherein the main pipeline is provided with a main pipeline tee joint for communicating with the branch pipelines.

4. The dual-fluid mixing mechanism suitable for synchronous grouting of a shield tunnel according to claim 1, wherein the check valve is a large-diameter steel ball type spring check valve.

5. The dual-fluid mixing mechanism suitable for synchronous grouting of a shield tunnel according to claim 1, wherein the inspection pipeline is correspondingly communicated with the branch pipeline through a branch tee.

6. The dual-fluid mixing mechanism suitable for synchronous grouting of a shield tunnel according to claim 1, wherein the closing valve and/or the inspection valve are manual ball valves.