Shield machine soil improvement system

Abstract

The present invention relates to a slag improvement system for a shield machine, wherein the shield machine includes a cutter disc and a soil bin behind the cutter disc, the slag improvement system includes a soil bin injection port arranged on the soil bin wall plate, a first cutter disc injection port at the center of the cutter disc opening, and a first cutter disc injection pipe connected to the first cutter disc injection port, and also includes a secondary grouting pump, the secondary grouting pump includes an A liquid pump and a B liquid pump, the water outlet end of the A liquid pump is connected to the soil bin injection port through the soil bin injection pipe in the shield body, the water outlet end of the B liquid pump is connected to the water inlet of the first cutter disc injection pipe, and the soil bin injection pipe is arranged in the shield body. The secondary grouting pump is reasonably connected to the shield machine, and the secondary grouting equipment in conventional shield construction is fully utilized. During the excavation process of the shield machine, since the pump energy of the secondary grouting pump is relatively large, the flushing capacity of the soil bin wall plate center and the cutter disc center opening is improved, so that the injection port is not easy to be blocked, and mud cakes are avoided in the soil bin wall plate center and the cutter disc center.

Description

Technical Field

[0001] The invention relates to the technical field of shield machine construction, and in particular to a shield machine slag improvement system. Background Art

[0002] Conventional slag improvement methods are often used in the design and use of shield machines at home and abroad. The slag improvement system is designed using the shield machine, and the cutterhead or soil bin is improved with improvers such as foam, mud, and water, which can basically meet the slag improvement of the shield machine under weak and single geological conditions. However, in complex strata such as mudstone, muddy siltstone, viscous dehydration, and uneven hardness, due to the influence of geology and hydrology, under the cutting of the tool and the impact of the cutterhead, the rock blocks become debris and powder, and the slag improvement effect at the center opening of the cutterhead is poor. Under the high temperature extrusion conditions of the cutterhead rotation, mud cakes are easily produced. At the same time, according to the existing shield machine construction test results, when the blocking pressure at the injection port is greater than the tolerable injection resistance, the pipeline is basically in a blocked state, and the improver cannot be injected, resulting in the inability to effectively improve the slag, which is easy to cause blockage in the soil bin and the formation of mud cakes. However, it is difficult to completely prevent the formation of mud cake in the center of the cutter disc by using conventional slag improvement systems. Once mud cake forms in the center of the cutter disc, it is extremely difficult to deal with. Once mud cake forms in the center, it will accelerate the rapid formation of mud cake in the soil bin and cutter disc, seriously affecting the normal construction of the shield machine. Summary of the invention

[0003] In order to overcome the above technical problems, especially the problem that the cutter head and soil bin are difficult to handle after the mud cake forms, which seriously affects the normal construction of the shield machine, the following technical solutions are proposed:

[0004] A shield machine slag improvement system is provided in an embodiment of the present application, the shield machine includes a cutterhead and a soil bin behind the cutterhead, the slag improvement system includes a soil bin injection port arranged on the soil bin wall panel, a first cutterhead injection port at the center of the cutterhead opening, and a first cutterhead injection pipe connected to the first cutterhead injection port, characterized in that it also includes a secondary grouting pump, the secondary grouting pump includes an A liquid pump and a B liquid pump, the water outlet end of the A liquid pump is connected to the soil bin injection port through the soil bin injection pipe in the shield body, the water outlet end of the B liquid pump is connected to the water inlet of the first cutterhead injection pipe, and the soil bin injection pipe is arranged in the shield body.

[0005] Optionally, it also includes a valve arranged on the soil bin injection pipe.

[0006] Optionally, the soil bin wall panel includes two soil bin injection ports, the soil bin injection pipe is connected in parallel to the two soil bin injection ports, and the two soil bin injection ports are two emergency standby injection ports on the soil bin wall panel.

[0007] Optionally, it also includes two sub-soil bin injection pipes and two valves, the two sub-soil bin injection pipes are connected to the soil bin injection pipe through a three-way pipe joint, the two sub-soil bin injection pipes are respectively connected to the two soil bin injection ports, and the two valves are respectively arranged on the two sub-soil bin injection pipes.

[0008] Optionally, the two sub-soil bin injection pipes are arranged on opposite sides of the central rotation axis of the shield machine.

[0009] Optionally, the valve includes a one-way valve and a ball valve, and the one-way valve and the ball valve are used to control the flow of water from the A liquid pump to the soil bin injection port.

[0010] Optionally, the center opening of the cutter disc is provided with two first cutter disc injection ports, and the two first cutter disc injection ports are connected in parallel to the first cutter disc injection pipe.

[0011] Optionally, it also includes two second cutter disc injection ports arranged at the center of the cutter disc opening, a mud adding pipe connected in parallel to the two second cutter disc injection ports, and a mud adding hole arranged at the center of the front side of the cutter disc and a second cutter disc injection pipe connected to the mud adding hole.

[0012] Optionally, it also includes a flow sensor and a pressure sensor respectively arranged in each pipeline.

[0013] Optionally, the two first blade disc injection ports and the two second blade disc injection ports are respectively arranged on both sides of the front center line of the blade disc, and the line connecting the two first blade disc injection ports and the line connecting the two second blade disc injection ports do not cross.

[0014] An embodiment of the present application also provides a shield machine, which includes a cutter disc, a soil bin behind the cutter disc, a shield behind the soil bin, and mechanical components in the shield for realizing one-time tunnel excavation. It is characterized in that it adopts a shield machine slag improvement system as described in any embodiment provided in the present application.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The shield machine slag improvement system provided in the embodiment of the present application reasonably connects the secondary grouting pump to the shield machine, making full use of the secondary grouting equipment in conventional shield construction. During the tunneling process of the shield machine, the secondary grouting pump is used to inject water into the emergency standby injection port in the center of the soil bin wall plate and the injection port of the cutter head opening. Since the pumping energy of the secondary grouting pump is relatively large, the flushing capacity of the center of the soil bin wall plate and the center of the cutter head opening is improved, making it less likely for the injection port to be blocked, avoiding the formation of mud cakes in the center of the soil bin wall plate and the center of the cutter head, and also avoiding the mud cakes affecting the normal construction of the shield machine.

[0017] In the shield machine slag improvement system provided in the embodiment of the present application, the A liquid pump of the secondary grouting pump is connected to the two emergency standby injection ports of the soil bin, and a one-way valve and a ball valve are provided on the branch pipe connected to each injection port so that when the thrust increases, the propulsion speed decreases, the cutter disc torque decreases, and the temperature of the equipment and slag increases, the secondary grouting A liquid pump is adjusted to a single-port injection at the center of the soil bin wall panel (one of the ball valves is closed), and the B liquid is injected at the same time, which can more effectively increase the flushing capacity of the cutter disc center, accelerate the time for the construction parameters to improve, and thus improve the construction efficiency.

[0018] The shield machine slag improvement system provided in the embodiment of the present application adopts a mud adding system to pressurize the two second cutter disc injection ports connected to another pipeline at the center opening of the cutter disc, and at the same time connects the other pipeline to the mud adding injection port at the center of the cutter disc panel, that is, the mud adding pipeline and the injection pipeline closest to the original slag improvement are replaced, which makes up for the low flushing capacity in the original water injection system, and adopts the mud and water adding system to flush the center opening of the cutter disc with a large flow rate to reduce the blockage of the center opening of the cutter disc.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is a structural diagram of the shield machine slag improvement system of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the cutterhead in the shield machine slag improvement system of the present invention, mainly showing the positions of the first cutterhead injection port, the second cutterhead injection port and the mud adding hole in the center of the cutterhead;

[0023] Figure 3 It is a schematic diagram of the structure of the soil bin in the shield machine slag improvement system of the present invention, mainly showing the position of the emergency standby injection port in the center of the soil bin;

[0024] Figure 4 It is a structural schematic diagram of the connection between the mud and water adding system and the second cutter head injection port in the shield machine slag improvement system of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the connection between the water adding system and the mud adding hole in the shield machine slag improvement system of the present invention. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0027] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of features, integers, steps, operations, but does not exclude the presence or addition of one or more other features, integers, steps, operations.

[0028] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0029] The present application provides a shield machine slag improvement system, such as Figures 1 to 3 As shown, it includes: a soil bin 1, a cutter head 2 installed on the soil bin, and a secondary grouting pump 3, wherein the soil bin 1 is arranged behind the cutter head 2 in the excavation direction, and the secondary grouting pump is reasonably connected to the shield machine, so as to make full use of the existing secondary grouting equipment required for conventional shield construction, establish a new slag improvement system, and optimize the existing shield machine slag improvement system in a targeted manner.

[0030] The secondary grouting pump 3 includes an A liquid pump 31 and a B liquid pump 32. The soil bin wall panel 11 is provided with a soil bin injection port 12. The center of the cutter disc opening is provided with a first cutter disc injection port 21. The cutter disc 2 is also provided with a first cutter disc injection pipe 211 connected to the first cutter disc injection port 21. The water outlet end of the A liquid pump 31 is connected to the soil bin injection port 12 through the soil bin injection pipe 13 in the shield body. The water outlet end of the B liquid pump 32 is connected to the water inlet of the first cutter disc injection pipe 21. The soil bin injection pipe 13 is arranged in the shield body. In the embodiment provided in the present application, since the maximum pump energy of the secondary grouting pump is 25m³ / h, which is approximately 420L / min, it can withstand a maximum front pressure injection resistance of approximately 9-10Mpa, and its pressure resistance and flushing capacity far exceed the pump energy of general water injection, mud addition and foam systems. The A liquid pump and B liquid pump of the secondary grouting pump are respectively connected to the soil bin injection port set on the soil bin wall panel and the single disc injection port on the cutter disc, thereby improving the flushing capacity of the openings in the center of the soil bin wall panel and the center of the cutter disc, making it less likely for the injection port to be blocked, thereby avoiding the formation of mud cakes in the center of the soil bin wall panel and the center of the cutter disc, and at the same time avoiding the mud cakes from affecting the normal construction of the shield machine.

[0031] In the embodiment provided in the present application, during the shield tunneling operation, the secondary grouting slag improvement A and B liquid systems can be used intermittently to effectively flush the center opening of the cutter disc and the center of the soil bin, prevent the soil from adhering to the center of the cutter disc, and reduce the impact of excessive flushing on the slag improvement effect by alternately opening the A and B liquid pumps at intervals. Among them, the opening time and interval time are adjusted according to the excavation speed and the slag improvement effect. When the excavation speed is 40-50mm / min, it can be opened for about 20-30s every 20cm of excavation to improve the fluidity of the slag at the center rotation, ensure the smooth opening of the center of the cutter disc, and effectively reduce the temperature of the cutter disc and the soil bin, prevent the formation of mud cakes in the center of the cutter disc and the soil bin, and reduce tool wear.

[0032] In the embodiments provided in this application, Figure 1 As shown, it also includes a valve 14 arranged on the soil bin injection pipe 13. Optionally, the valve 14 includes a one-way valve and a ball valve, and the one-way valve and the ball valve are used to control the flow of water from the A liquid pump to the soil bin injection port. During the tunneling process of the shield machine, by real-time detection of changes in the cutter head torque, total thrust, tunneling speed and slag temperature, if there is an increase in thrust, a decrease in propulsion speed, a decrease in the cutter head torque, and an increase in the temperature of the equipment and slag, it can be judged that the cutter head has signs of mud cake. At this time, the secondary grouting A liquid pump is immediately adjusted to a single-port injection at the center of the soil bin wall plate, and the slag improver is discharged from one soil bin injection port 12, that is, one of the ball valves is closed, and the water pressure injection of the B liquid pump is coordinated at the same time, which can more effectively increase the scouring of the cutter head center, and can quickly and effectively promote the improvement of the shield machine construction parameters, thereby avoiding the soil in the center of the cutter head causing the mud cake in the center of the soil bin. After the construction parameter grouting is adjusted to the optimal stability, the simultaneous pressure injection time can be appropriately reduced.

[0033] In the embodiments provided in this application, Figure 1 and Figure 3 As shown, the soil bin wall panel includes two soil bin injection ports 12, that is, the soil bin injection ports 12 are arranged on the soil bin wall panel, and the soil bin injection pipe 13 is connected in parallel to the two soil bin injection ports 12, and the two soil bin injection ports 12 are two emergency standby injection ports on the soil bin wall panel. The composite earth pressure balance shield machine reserves some emergency standby injection ports on the soil bin panel, which are distributed at the center of the soil bin wall panel. Optionally, there are 5 emergency standby injection ports distributed near the center of the soil bin wall panel, and the five emergency standby injection ports are: 121, 122, 123, 124, 125, respectively, and the emergency standby injection ports connected to the A liquid pump are separated by an emergency standby injection port (such as 122, 125), so that the soil bin wall panel can be flushed from different angles, accelerating the shedding speed of the soil in the center of the soil bin wall panel, and at the same time, a certain flushing angle can be achieved, and the flushing water flow can cover more of the center of the soil bin wall panel, thereby reducing the temperature of the soil bin and preventing the formation of mud cakes in the center of the soil bin.

[0034] In the embodiments provided in this application, Figure 1 As shown, it also includes two sub-soil bin injection pipes 131 and two valves 14. The two sub-soil bin injection pipes 131 are connected to the soil bin injection pipe 13 through a three-way pipe fitting joint. The two sub-soil bin injection pipes 131 are respectively connected to the two soil bin injection ports 12. The two valves 14 are respectively arranged on the two sub-soil bin injection pipes 131. Correspondingly, the soil bin injection pipe 13 is arranged inside the shield body. The soil bin injection pipe is divided into two sub-soil bin injection pipes 131 through a three-way pipe fitting joint inside the shield body. Optionally, the two sub-soil bin injection pipes 131 are arranged on opposite sides of the central rotation axis of the shield machine. A ball valve and a one-way valve are arranged on each sub-soil bin injection pipe 131, so that each sub-soil bin injection pipe can control the opening of the pipeline individually through the ball valve, and control the direction of the water flow through the one-way valve. During the excavation construction of the shield machine, at least one of the pipeline ball valves can be opened, and two pipeline ball valves can also be opened at the same time. Combined with Figure 1 and Figure 3 That is, a single pump of liquid A can simultaneously connect 1-2 soil bin injection ports (122, 125) in the center of the soil bin wall, and perform high-pressure water injection flushing on the center of the soil bin wall plate 11 through the 1-2 soil bin injection ports 12.

[0035] In the embodiments provided in this application, Figure 1 and Figure 2 As shown, the central opening of the cutter disc is provided with two first cutter disc injection ports 21, and the two first cutter disc injection ports 21 are connected in parallel to the first cutter disc injection pipe 211. That is, the B liquid pump 32 is connected to two of the cutter disc injection ports at the central opening of the cutter disc. Since the two cutter disc injection ports are connected in parallel, the B liquid pump is further connected in parallel to the main pipeline of the two cutter disc injection ports, so as to realize the flushing of the two central openings of the cutter disc by the B liquid pump, and avoid the formation of mud cake at the central opening of the cutter disc.

[0036] In the embodiments provided in this application, Figure 2 , Figure 4 as well as Figure 5 The shield machine also includes two second cutter disc injection ports 22 arranged at the center of the cutter disc opening, a mud adding pipe 221 connected in parallel to the two second cutter disc injection ports 22, and a mud adding hole 23 arranged at the center of the front of the cutter disc, and a second cutter disc injection pipe 231 connected to the mud adding hole 23. Before the shield machine is connected to the secondary grouting pump, when the shield machine is used for slag improvement, the mud adding pipe 221 is originally connected to the mud adding hole 23, and the second cutter disc injection pipe 231 is originally connected to the second cutter disc injection port 22. In order to be able to more fully reopen the cutter disc center opening and reasonably utilize the original shield machine's mud and water adding system, the mud adding pipeline and the injection pipeline that are closest to the original slag improvement are replaced, wherein the mud and water adding system connected to the original mud adding pipeline and the water injection system connected to the injection pipeline remain unchanged. Figure 4 and Figure 5 As shown, the mud adding pipe 221 in the mud and water adding system 5 is connected to the second cutter disc injection port 22, so that the mud and water adding system 5 can pressurize the two second cutter disc injection ports 22 opened in the center of the cutter disc, and the injection pipe 231 of the water injection system 6 is connected to the mud adding hole 23 in the center of the front of the cutter disc, so that the water injection system 6 injects water and pressurizes the mud adding hole 23 in the center of the cutter disc panel.

[0037] By replacing the closest mud adding pipeline and water injection pipeline in the original slag improvement, the center opening of the cutter disc can be flushed in a targeted manner according to the position of the center opening of the cutter disc and the injection ports set at the center opening of the cutter disc (including: the first cutter disc injection port, the second cutter disc injection port and the mud adding hole). At the same time, the higher pump energy of the mud adding system and the pump energy of the B liquid pump increase the flushing capacity of the center of the cutter disc, which makes up for the low flushing capacity in the original water injection system. The original water adding system is connected to the mud adding hole, which plays an auxiliary flushing role on the center opening of the cutter disc and reduces the blockage of the center opening of the cutter disc.

[0038] In the examples provided in this application, reference is made to Figure 1 and Figure 2 as well as Figure 4 and Figure 5, four openings are arranged at the center of the cutter disc, and the two first cutter disc injection ports 21 and the two second cutter disc injection ports 22 are arranged on both sides of the center line of the front of the cutter disc, respectively, and the connection line of the two first cutter disc injection ports 21 and the connection line of the two second cutter disc injection ports 22 do not cross. The non-crossing arrangement avoids the cross-arrangement of the cutter disc injection pipes, making the pipelines in the shield body neater. Optionally, it also includes a sensor device 4 respectively arranged in each pipeline, and the sensor device 4 includes a flow sensor and a pressure sensor. The sensor device 4 can detect the flow and pressure in each pipeline in real time, and adjust the flow and pressure in the pipeline when the pressure is too large or too small.

[0039] In the embodiments provided in this application, when the secondary grouting pump is connected to the slag improvement system, the pump energy based on the secondary grouting pump can solve most pipeline blockage problems. When it is found that some pipelines may be blocked during construction, the system provided in the embodiments of this application can be used to temporarily connect the pipelines and flush the corresponding injection ports. Figure 4 and Figure 5 , since the shield machine is provided with 1# mud and water adding system 5, 2# mud and water adding system, 1# water injection system 6 and 2# water adding system. When the shield machine is excavating, the shield machine slag improvement system provided in the embodiment of the present application is applied to the slag improvement system, and the 1# mud and water adding system 5 and the 1# water injection system 6 cooperate with the shield machine slag improvement system provided in the embodiment of the present application. When used, the pump energy should be adjusted to more than 80%, and large-flow intermittent pressure injection is performed, which can effectively prevent the corresponding opening position from being blocked. Correspondingly, the 1# mud and water adding system 5 is connected in parallel with the two second cutter disc injection ports 22 through the mud adding pipe 221, and the 1# water injection system 6 is connected with the mud adding hole 23 through the second cutter disc injection pipe 231. Among them, the 1# mud and water adding system 5 was originally connected with the mud adding hole 23 through the mud adding pipe 221, and the 1# water injection system 6 was originally connected with the two second cutter disc injection ports 22 through the second cutter disc injection pipe 231.

[0040] Based on the modified injection port connecting the 1# mud and water adding system and the 1# water injection system, the 2# water adding system can be used as a backup water injection system. Therefore, it is not connected to the pipeline for the time being. When needed, it will be connected to the flushing pipeline to ensure the flushing ability of the cutter disc and avoid blockage of the center opening of the cutter disc. The injection flow of the 2# mud and water adding system and the 1# water injection system can be adjusted according to the dryness and wetness of the slag improvement, mainly cooperating with other systems to control the dryness and wetness of the slag to prevent pipeline blockage. In order to effectively avoid blockage of the injection port, and at the same time avoid excessive injection of the improver to cause the slag to be too thin and produce gushing during the flushing of the cutter disc or soil bin through the anti-mud cake system, it is necessary to reasonably control the injection time and injection volume of the improvement system, that is, the time when the A liquid pump and the B liquid pump are opened alternately and at intervals.

[0041] In the embodiments provided by the present application, during construction, the A liquid pump and the B liquid pump can be simultaneously connected to the first and second cutter disc injection ports at the center of the cutter disc opening, or simultaneously connected to the soil bin injection port, or connected to each injection port of the cutter disc panel, according to the effect of soil improvement. The shield machine soil improvement system provided by the present application can be applied to the soil improvement process during shield tunneling, including before using the shield machine soil improvement system provided by the embodiment of the present application, the shield has initially formed mud cake or light mud cake, and when the soil improvement system provided by the present application is applied, the mud cake in the cutter disc or soil bin is removed by reasonable injection and adjustment of the soil improvement materials, and each injection port is used to inject soil improvers. At the same time, the shield machine soil improvement system provided by the embodiment of the present application also includes injection pipelines for various improvers, as well as related equipment such as foam, mud addition, and water injection to achieve soil improvement during shield tunneling.

[0042] The present application also provides a shield machine, which includes a cutter disc, a soil bin behind the cutter disc, a shield behind the soil bin, and mechanical components in the shield for realizing one-time tunnel excavation. The shield machine adopts the shield machine slag improvement system provided in any embodiment of the present application.

[0043] In the embodiment provided in the present application, the water injected into the shield machine slag improvement system can be replaced with a foaming agent for improving the slag, so as to avoid the formation of mud cakes in the center of the cutter head and the soil bin during the excavation of the shield machine, and to avoid excessive water injection resulting in too thin improved slag, so as to ensure the improvement effect of the slag. Accordingly, a foaming agent or a dispersed foaming agent is used to improve the slag, and a foam ratio experiment is carried out in advance. According to the analysis of the cutter head torque, total thrust, propulsion speed, screw machine pressure and excavation effect, the optimal ratio of compressed air, foaming agent and water is determined to improve the fluidity of the soil. The foaming effect and slag improvement are checked after each shift and after adding the foam stock solution, and the foam parameter ratio is adjusted in time (such as stock solution 1: water 24, mixed solution 1: air 8).

[0044] In summary, the shield machine slag improvement system provided by the present application has the following beneficial effects:

[0045] The shield machine slag improvement system provided in the embodiment of the present application reasonably connects the secondary grouting pump to the shield machine, making full use of the secondary grouting equipment in conventional shield construction. During the excavation process of the shield machine, the secondary grouting pump is used to inject water into the emergency standby injection port in the center of the soil bin wall plate and the injection port of the cutter head opening. Since the pumping energy of the secondary grouting pump is relatively large, the flushing capacity of the center of the soil bin wall plate and the center of the cutter head is improved, making it less likely for the injection port to be blocked, avoiding the formation of mud cakes in the center of the soil bin wall plate and the center of the cutter head, and also avoiding the mud cakes affecting the normal construction of the shield machine.

[0046] In the shield machine slag improvement system provided in the embodiment of the present application, the A liquid pump of the secondary grouting pump is connected to the two emergency standby injection ports of the soil bin, and a one-way valve and a ball valve are provided on the branch pipe connected to each injection port so that when the thrust increases, the propulsion speed decreases, the cutter disc torque decreases, and the temperature of the equipment and slag increases, the secondary grouting A liquid pump is adjusted to a single-port injection at the center of the soil bin wall panel (one of the ball valves is closed), and the B liquid is injected at the same time, which can more effectively increase the flushing of the cutter disc center, accelerate the time for the construction parameters to improve, and thus improve the construction efficiency.

[0047] The shield machine slag improvement system provided in the embodiment of the present application adopts a mud adding system to pressurize the two second cutter disc injection ports connected to another pipeline at the center opening of the cutter disc, and at the same time connects the other pipeline to the mud adding injection port at the center of the cutter disc panel, that is, the mud adding pipeline and the injection pipeline closest to the original slag improvement are replaced, which makes up for the low flushing capacity in the original water injection system, and adopts the mud and water adding system to flush the center opening of the cutter disc with a large flow rate to reduce the blockage of the center opening of the cutter disc.

[0048] The above are only some embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A shield machine slag improvement system, the shield machine comprising a cutterhead and a soil bin behind the cutterhead, the slag improvement system comprising a soil bin injection port arranged on a soil bin wall plate, a first cutterhead injection port at the center of the cutterhead opening, and a first cutterhead injection pipe connected to the first cutterhead injection port, characterized in that: Also includes a secondary grouting pump, the secondary grouting pump includes an A liquid pump and a B liquid pump, the water outlet of the A liquid pump is connected to the soil bin injection port through the soil bin injection pipe in the shield body, the water outlet of the B liquid pump is connected to the water inlet of the first cutter head injection pipe, and the soil bin injection pipe is arranged in the shield body; The center opening of the cutter disc is provided with two first cutter disc injection ports, and the two first cutter disc injection ports are connected in parallel to the first cutter disc injection pipe; it also includes two second cutter disc injection ports arranged at the center of the cutter disc opening, a mud adding pipe connected in parallel to the two second cutter disc injection ports, and a mud adding hole arranged at the center of the front face of the cutter disc, and a second cutter disc injection pipe connected to the mud adding hole; it also includes a flow sensor and a pressure sensor respectively arranged in each pipeline; the two first cutter disc injection ports and the two second cutter disc injection ports are respectively arranged on both sides of the center line of the front face of the cutter disc, and the connecting line of the two first cutter disc injection ports and the connecting line of the two second cutter disc injection ports do not cross.

2. The shield machine slag improvement system according to claim 1, characterized in that: It also includes a valve arranged on the soil bin injection pipe.

3. The shield machine slag improvement system according to claim 2, characterized in that: The soil bin wall plate comprises two soil bin injection ports, the soil bin injection pipe is connected in parallel to the two soil bin injection ports, and the two soil bin injection ports are two emergency standby injection ports on the soil bin wall plate.

4. The shield machine slag improvement system according to claim 3, characterized in that: It also includes two sub-soil bin injection pipes and two valves. The two sub-soil bin injection pipes are connected to the soil bin injection pipe through a three-way pipe joint. The two sub-soil bin injection pipes are respectively connected to the two soil bin injection ports. The two valves are respectively arranged on the two sub-soil bin injection pipes.

5. The shield machine slag improvement system according to claim 4, characterized in that: The two sub-soil bin injection pipes are arranged on opposite sides of the central rotation axis of the shield machine.

6. The shield machine slag improvement system according to claim 2, characterized in that: The valve includes a one-way valve and a ball valve, and the one-way valve and the ball valve are used to control the water flow from the A liquid pump to the soil bin injection port.

7. A shield machine, comprising a cutterhead, a soil bin behind the cutterhead, a shield behind the soil bin, and a mechanical assembly in the shield for achieving one-step tunneling, characterized in that: It adopts the shield machine slag improvement system as described in any one of claims 1 to 6.

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