Slurry shield split starting construction method under deep foundation pit high water pressure small operation space

文档序号：17652 发布日期：2021-09-21 浏览：19次中文

阅读说明：本技术 深基坑高水压小作业空间下泥水盾构分体始发施工方法 (Slurry shield split starting construction method under deep foundation pit high water pressure small operation space ) 是由孟绥宝杜弘喆冯慧君俞然刚詹森王尧周耀升骆超锋李培国王澜涛石宝于 2021-07-09 设计创作，主要内容包括：本发明属于海底隧道施工技术领域,公开了一种深基坑高水压小作业空间下泥水盾构分体始发施工方法,盾尾密封装置的改进,采用U型素地下连续墙施工措施,一阶段把盾构机主体部分下井组装,第一台车下井置于一侧,桥架与盾体相连,桥架与第一台车上的进浆泵进口和进浆管路用橡胶软管相连,长度满足盾构分体要求；二阶段将第一台车调直并与桥架连接,再将第二台车下井与第一台车连接,设备进行调通；三阶段将剩余后配套台车及设备下井组装,并及时拆除反力架、始发钢套筒和负环管片,进入正常掘进。本发明将盾构分体始发分为三大阶段,适用于深基坑高水压小作业空间下的盾构分体始发施工,有效降低了施工成本和难度,节约了施工工期。(The invention belongs to the technical field of submarine tunnel construction, and discloses a slurry shield split starting construction method under a deep foundation pit high water pressure small operation space, wherein a shield tail sealing device is improved, U-shaped plain underground continuous wall construction measures are adopted, a main body part of a shield machine is assembled in a well in one stage, a first trolley is arranged at one side in the well, a bridge frame is connected with a shield body, the bridge frame is connected with a slurry inlet pump inlet and a slurry inlet pipeline on the first trolley through rubber hoses, and the length meets the shield split requirement; secondly, aligning and connecting the first trolley with the bridge, then connecting the second trolley with the first trolley, and communicating the equipment; and in the third stage, the residual matched trolley and equipment are put into the well for assembly, and the reaction frame, the starting steel sleeve and the negative ring pipe piece are timely dismantled for normal tunneling. The invention divides the shield split starting into three stages, is suitable for the shield split starting construction under the high water pressure small operation space of the deep foundation pit, effectively reduces the construction cost and difficulty and saves the construction period.)

1. The slurry shield split starting construction method under the deep foundation pit high-water-pressure small-operation space is characterized by comprising the following steps of:

aiming at the high water pressure condition, the shield tail of the shield equipment is designed by four shield tail brushes, and the last tail brush adopts a spring plate;

in the end reinforcement measure, a U-shaped plain underground continuous wall is adopted for construction;

assembling the steel sleeve and a shield machine host downhole, translating to a starting end for positioning, installing a starting base and a negative ring, and connecting the bridge downhole with a shield body; then, the first trolley is put into the shaft and translated to be perpendicular to the line direction, and is connected with the bridge; leading the slurry into a slurry discharge pipe from the slurry separation station, leading the slurry into the underground and being vertical to the bottom plate; at the moment, the second trolley and the sixth trolley are placed on the ground and connected with the first trolley through the extension pipeline, and the underground equipment is debugged for the first time;

aligning and connecting the first trolley with the bridge, and then putting the second trolley into the well to be connected with the first trolley; an elbow is arranged on the slurry inlet and outlet pipe at the tail part of the second trolley, and a pipeline joint is led to a proper position and is connected with a corresponding underground pipeline through a rubber hose; at the moment, a third trolley and a sixth trolley are placed on the ground and connected with the second trolley through an extension pipeline, and the underground equipment is jointly debugged;

sequentially assembling the rest matched trolleys and equipment in the well, and timely dismantling the reaction frame, the starting steel sleeve and the negative ring pipe piece; erecting a section steel support, introducing a slurry inlet and outlet pipeline and the section steel support into a tunnel through a segment car, connecting the pipeline extension device with a trolley arranged behind, and erecting a slurry outlet pump at a proper position in the pit; the other end of the slurry inlet and outlet pipeline led out from the shield machine is connected with a corresponding underground pipeline; after all the equipment goes into the well, the whole shield system is integrally debugged, and the normal tunneling stage of the shield is started.

2. The split starting construction method of the slurry shield under the deep foundation pit high water pressure small working space as claimed in claim 1, wherein the U-shaped plain underground diaphragm wall is constructed in a groove, the groove is constructed by adopting a grab bucket grabbing construction process, and the lengths of the main hole and the auxiliary hole are determined according to the opening of a grab bucket body; during construction, the main hole is grabbed first, and then the auxiliary hole is grabbed.

3. The split starting construction method of the slurry shield under the deep foundation pit high-water-pressure small-operation space as claimed in claim 1, wherein the trench is used for controlling the slurry level, the slurry level is above 1m of the underground water level and is not lower than 0.3m of the top surface of the guide wall, and slurry is timely supplemented when the slurry level falls.

4. The split starting construction method of the slurry shield in the deep foundation pit high water pressure small working space as claimed in claim 1, wherein the wall brushing construction of the U-shaped plain underground diaphragm wall is carried out, the wall brushing cleaning is carried out on the seam of the leading wall at the joint of the diaphragm wall, the soil and the mud on the wall of the joint are sunk into the bottom of the groove at a slow speed by using a crane to hang a steel wire wall brushing device, then the wall brushing device is lifted at a medium speed, the wall brushing device is attached to the surface of the wall joint, and the cleaning is carried out at the joint repeatedly for not less than 20 times until the soil and the mud are completely removed.

5. The separate starting construction method for the slurry shield under the deep foundation pit high-water-pressure small-operation space as claimed in claim 1, wherein the U-shaped plain underground diaphragm wall is poured with concrete, the concrete pouring is performed by a conduit method, and the conduit is a circular spiral quick coupling type with D being 250; and hoisting the guide pipe into the specified position of the groove section by using a concrete pouring frame, and installing a square funnel at the top of the guide pipe.

6. The separate starting construction method for the slurry shield under the deep foundation pit high-water-pressure small-operation space as claimed in claim 1, wherein one section steel support is erected every 3m, and the slurry inlet and outlet pipeline is led into the tunnel through the segment car and the section steel support.

7. The separate slurry shield launching construction device under the deep foundation pit high-water-pressure small operation space for implementing the separate slurry shield launching construction method under the deep foundation pit high-water-pressure small operation space according to any one of claims 1 to 6, is characterized by comprising the following components: the system comprises a starting well, a shield machine, pipe pieces, a bridge frame, a reaction frame, a first trolley, a connecting pipeline, a second trolley, a third trolley, a fourth trolley, a fifth trolley, a sixth trolley, a slurry inlet pipe, a steel support, a steel sleeve and a construction platform;

the first trolley is placed in the shaft in a translation mode to be perpendicular to the line direction, the first trolley is connected with the bridge, the steel sleeve and the shield machine host are assembled in the shaft from the middle position of a wellhead of the initiating end, and the steel sleeve and the shield machine host are moved to the initiating end for positioning and installation; the lower well of the bridge is connected with the shield body; the slurry inlet and outlet pipe is led out from the slurry separation station and led to the underground and is vertical to the bottom plate;

the bridge frame is connected with an inlet of a slurry inlet pump on the first trolley and a slurry inlet pipeline through rubber hoses, an outlet of the slurry inlet pump is connected with a slurry discharge pipeline through an elbow, and other pipelines between the bridge frame and the first trolley are simultaneously prolonged;

the second trolley, the third trolley, the fourth trolley, the fifth trolley and the sixth trolley are placed on the ground and connected with the first trolley through the extension pipeline;

the first trolley is aligned and connected with the bridge, and then the second trolley is put into the well and connected with the first trolley;

an elbow is arranged on the slurry inlet and outlet pipe at the tail part of the second trolley and is connected with a corresponding underground pipeline through a rubber hose;

the slurry inlet and outlet pipeline is led into the tunnel through the segment car and the section steel support and is connected with a pipeline extending device of a fifth trolley; erecting a slurry inlet pump at a proper position in the pit, and connecting the slurry inlet pump with a corresponding pipeline; the other end of the slurry inlet and outlet pipeline led out from the shield machine is connected with a corresponding underground pipeline.

8. The slurry shield split starting construction device under the deep foundation pit high water pressure small operation space as claimed in claim 7, wherein the duct piece transportation adopts the last section of duct piece trolley, and 3 duct pieces are transported each time;

a water stop strip is pasted on the negative ring pipe sheet and is assembled in the steel sleeve;

the first and second trolleys enter the hole at 40 m.

9. The slurry shield split starting construction device under the deep foundation pit high-water-pressure small working space as claimed in claim 7, wherein the horizontal transportation group comprises one electric power truck, two segment cars and one mortar car.

10. The separate starting construction device for the slurry shield under the deep foundation pit high-water-pressure small working space as claimed in claim 7, wherein the horizontal transportation group comprises a battery car, a three-segment car and a mortar car, and the added segment car is placed in front of the battery car head and used for transporting a slurry pipeline.

Technical Field

The invention belongs to the technical field of submarine tunnel construction, and particularly relates to a slurry shield split starting construction method under a deep foundation pit high water pressure small operation space.

Background

In the current submarine tunnel construction, the shield method has become the main method of submarine tunnel construction due to the characteristics of safe and stable construction, small influence on the surrounding environment and the like. The shield construction technology comprises three construction stages of starting, tunneling and receiving, wherein shield starting operation is a difficult point in slurry shield construction.

When the shield machine integrally starts, the length of a starting well is larger than the overall length of the shield machine, and the shield machine can be assembled on the ground and then hoisted and assembled in a well to carry out integral starting and tunneling. Under the actual construction condition, because the limitation of site conditions can cause insufficient operation space, the whole starting of the shield machine cannot be carried out, at the moment, a split construction method of the shield machine is adopted, a main body of the shield machine and part of trolleys are hoisted and put into a well for debugging, and a certain distance is started; and then sequentially descending the residual matched trolleys into the well for assembly, completing the starting operation after debugging, and starting normal tunneling construction.

Under some special construction conditions, when the buried depth of the starting well is large, namely the water pressure is very high, the slurry shield split starting construction becomes a difficult problem, and how to smoothly realize the slurry shield split starting under the conditions of large buried depth, high water pressure and small space becomes a key problem to be solved urgently by technical personnel in the field.

Through the above analysis, the problems and defects of the prior art are as follows: the slurry shield split starting can be smoothly realized under the conditions of large burial depth, high water pressure and small space.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a slurry shield split starting construction method under a deep foundation pit high water pressure small operation space.

The invention is realized in such a way that the slurry shield split starting construction method under the deep foundation pit high water pressure small operation space comprises the following steps:

aiming at the high water pressure condition, the shield tail of the shield equipment is designed by four shield tail brushes, and the last tail brush adopts a spring plate;

in the end reinforcement measure, a U-shaped plain underground continuous wall is adopted for construction;

Further, carrying out groove forming construction on the U-shaped plain underground diaphragm wall, wherein the groove forming adopts a grab bucket grabbing construction process, and the lengths of the main hole and the auxiliary hole are determined according to the opening of a grab bucket body; during construction, the main hole is grabbed first, and then the auxiliary hole is grabbed.

Furthermore, the liquid level of the slurry is controlled by digging a groove, the liquid level of the slurry is above 1m of the underground water level and is not lower than 0.3m of the top surface of the guide wall, and the slurry is timely supplemented when the liquid level falls.

Further, the wall brushing construction of the U-shaped plain underground diaphragm wall is carried out, the wall brushing cleaning is carried out on the seam of the preceding width wall at the joint of the diaphragm wall, soil residues and mud skin of the joint wall are suspended by a crane and slowly sunk into the bottom of the groove, then the wall brushing device is lifted at an intermediate speed to be tightly attached to the wall brushing surface of the wall joint, and the wall brushing device is repeatedly brushed up and down at the joint for not less than 20 times until the soil residues and the mud skin are completely removed.

Further, concrete pouring is carried out on the U-shaped plain underground continuous wall, the concrete pouring is carried out by adopting a conduit method, and the conduit is in a circular spiral quick connector type with D being 250; and hoisting the guide pipe into the specified position of the groove section by using a concrete pouring frame, and installing a square funnel at the top of the guide pipe.

Furthermore, one section steel support is erected every 3m, and a slurry inlet and outlet pipeline is led into the tunnel through the segment car and the section steel supports.

Another object of the present invention is to provide a slurry shield split starting construction device under a deep foundation pit high water pressure small operation space, which implements the slurry shield split starting construction method under a deep foundation pit high water pressure small operation space, and the slurry shield split starting construction device under a deep foundation pit high water pressure small operation space includes: the system comprises a starting well, a shield machine, pipe pieces, a bridge frame, a reaction frame, a first trolley, a connecting pipeline, a second trolley, a third trolley, a fourth trolley, a fifth trolley, a sixth trolley, a slurry inlet pipe, a steel support, a steel sleeve and a construction platform;

the second trolley, the third trolley, the fourth trolley, the fifth trolley and the sixth trolley are placed on the ground and connected with the first trolley through the extension pipeline;

the first trolley is aligned and connected with the bridge, and then the second trolley is put into the well and connected with the first trolley;

an elbow is arranged on the slurry inlet and outlet pipe at the tail part of the second trolley and is connected with a corresponding underground pipeline through a rubber hose;

Further, the last segment of segment trolley is adopted for segment transportation, and 3 segments are transported each time;

a water stop strip is pasted on the negative ring pipe sheet and is assembled in the steel sleeve;

the first and second trolleys enter the hole at 40 m.

Further, the horizontal transportation is organized into a battery car, two segment cars and a mortar car.

Furthermore, the horizontal transportation marshalling is a section of storage battery car, three section of jurisdiction cars, a section of mortar car, and the section of jurisdiction car that increases is placed in front of the storage battery locomotive for transport slurry pipeline.

By combining all the technical schemes, the invention has the advantages and positive effects that: the invention utilizes the original equipment of the shield machine to the maximum extent, reduces the reconstruction of the original equipment and cancels unnecessary equipment; the underground installation of the shield machine and the underground installation of the ground rear supporting trolley after the tunneling in the starting stage are facilitated; the length of a connecting pipeline between the underground trolley and the trolley is reduced, so that the economic cost and the energy consumption are reduced; the tunneling at the starting stage can be completed quickly; does not occupy the necessary working surface of the ground. In the high-water-pressure water-rich stratum, the underground water is in hydraulic connection with the seawater, the water head pressure is large, the influence of the seawater tide is obvious, and the U-shaped plain underground continuous wall can effectively prevent water gushing and sand gushing, prevent the air shaft structure from being damaged and prevent the ground surface from settling.

The invention mainly comprises three stages of equipment improvement, end reinforcement measure work and starting process: the improvement of the shield tail sealing device adopts the construction measure of a U-shaped plain underground diaphragm wall, the main body part of the shield machine is put into a well and assembled at one stage, a first trolley is put into the well and arranged at one side, a bridge frame is connected with a shield body, the bridge frame is connected with an inlet of a slurry inlet pump on the first trolley and a slurry inlet pipeline through rubber hoses, and the length meets the split requirement of the shield; secondly, aligning and connecting the first trolley with the bridge, then connecting the second trolley with the first trolley, and communicating the equipment; and in the third stage, the residual matched trolley and equipment are put into the well for assembly, and the reaction frame, the starting steel sleeve and the negative ring pipe piece are timely dismantled for normal tunneling. The invention divides the shield split starting into three stages, is suitable for the shield split starting construction under the high water pressure small operation space of the deep foundation pit, effectively reduces the construction cost and difficulty and saves the construction period.

Compared with the prior art, the invention carries out targeted improvement on the equipment under the condition of not having integral starting of the slurry shield and aiming at the condition of high water pressure and small operation space, also carries out targeted construction in the end reinforcement measure, and separately assembles and debugs the shield body in the starting well; through rational arrangement of trolley positions and construction sequence combing, the construction process is divided into three stages, and the high efficiency of split starting of the slurry shield is ensured, so that the construction operation cost is reduced.

Drawings

FIG. 1 shows a slurry shield split starting construction method under a deep foundation pit high water pressure small working space provided by the embodiment of the invention.

Fig. 2 is a schematic view of a split starting structure of a large buried deep slurry shield provided by an embodiment of the present invention.

Fig. 3 is a schematic diagram of an arrangement manner of a first stage of slurry shield split starting construction provided by the embodiment of the invention.

Fig. 4 is a schematic diagram of a two-stage arrangement mode of slurry shield split starting construction provided by the embodiment of the invention.

Fig. 5 is a schematic diagram of a three-stage arrangement mode of slurry shield split starting construction provided by the embodiment of the invention.

In the figure: 1. an originating well; 2. a shield machine; 3. a duct piece; 4. a bridge frame; 5. a reaction frame; 6. a first trolley; 7. connecting a pipeline; 8. a second carriage; 9. a third trolley; 10. a fourth trolley; 11. a fifth trolley; 12. a sixth trolley; 13. a pulp inlet pipe; 14. supporting steel; 15. a steel sleeve; 16. and (5) constructing a platform.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Aiming at the problems in the prior art, the invention provides a slurry shield split starting construction method under a deep foundation pit high water pressure small operation space, and the invention is described in detail below by combining with the accompanying drawings.

As shown in FIG. 1, the slurry shield split starting construction method under the deep foundation pit high water pressure small operation space provided by the invention comprises the following steps:

s101: aiming at the high water pressure condition, the shield tail of the shield equipment is designed by four shield tail brushes, the last tail brush is designed specially, and the specially-made spring plate can effectively prevent mud from entering the interior of the tail brush.

S102: in the end reinforcement measure, a U-shaped plain underground continuous wall is adopted for construction.

S103: assembling the steel sleeve and a main engine of the shield tunneling machine in a well, translating to a starting end for positioning, installing a starting base and a negative ring, connecting the bridge well with a shield body, translating the first trolley in the well to be vertical to the line direction, and connecting the first trolley with the bridge; and leading the slurry into a slurry discharge pipe from the slurry separation station, leading the slurry into the underground and being vertical to the bottom plate. At the moment, the second trolley and the sixth trolley are placed on the ground and connected with the first trolley through the extension pipeline, and the underground equipment is debugged for the first time.

S104: aligning and connecting the first trolley with the bridge, and then putting the second trolley into the well to be connected with the first trolley; and an elbow is arranged on the slurry inlet and outlet pipe at the tail part of the second trolley, the pipeline joint is led to a proper position and is connected with a corresponding underground pipeline through a rubber hose, at the moment, the third trolley and the sixth trolley are placed on the ground and are connected with the second trolley through an extension pipeline, and underground equipment is jointly debugged.

S105: sequentially assembling the rest matched trolleys and equipment in the well, and timely dismantling the reaction frame, the starting steel sleeve and the negative ring pipe piece; erecting one section steel support every 3m, leading a slurry inlet and outlet pipeline into the tunnel through the segment car and the section steel support, connecting the pipeline extension device with a trolley arranged behind, and erecting a slurry outlet pump at a proper position in the pit; the other end of the slurry inlet and outlet pipeline led out from the shield machine is connected with the corresponding underground pipeline. After all the equipment goes into the well, the whole shield system is integrally debugged, and the normal tunneling stage of the shield is started.

Ordinary technicians in the field of the construction method for separately launching the slurry shield under the deep foundation pit high-water-pressure small-operation space provided by the invention can also implement the construction method by adopting other steps, and the construction method for separately launching the slurry shield under the deep foundation pit high-water-pressure small-operation space provided by the invention shown in the figure 1 is only a specific embodiment.

The slurry shield split starting construction method under the deep foundation pit high water pressure small operation space provided by the invention specifically comprises the following steps:

the method comprises the steps that firstly, shield equipment is correspondingly improved under the condition of high water pressure, the shield tail is sealed by adopting four shield tail brushes, the last tail brush is specially designed, and a specially-made spring plate can effectively prevent mud from entering the interior of the tail brush.

Step two, preparation: in the end reinforcement measure, a U-shaped plain underground continuous wall is adopted for construction.

Step three, a stage: assembling the steel sleeve and a main engine of the shield tunneling machine in a well, translating to a starting end for positioning, installing a starting base and a negative ring, connecting the bridge well with a shield body, translating the first trolley in the well to be vertical to the line direction, and connecting the first trolley with the bridge. Then leading out the slurry inlet and outlet pipe from the slurry separation station, leading to the underground and being vertical to the bottom plate. At the moment, the second trolley to the sixth trolley are placed on the ground and connected with the first trolley through the extension pipeline, and the underground equipment is debugged for the first time.

Step four, two stages: in order to start the synchronous grouting system as early as possible, after the condition of first-stage tunneling is met, the first trolley is aligned and connected with the bridge frame, and then the second trolley is put into the well and connected with the first trolley. And an elbow is arranged on the slurry inlet and outlet pipe at the tail part of the second trolley, the pipeline joint is led to a proper position and is connected with a corresponding underground pipeline through a rubber hose, at the moment, the third trolley to the sixth trolley are placed on the ground and are connected with the second trolley through an extension pipeline, and underground equipment is jointly debugged.

Step five, three stages: and after the second-stage tunneling condition is met, sequentially descending the residual back matched trolleys and the equipment into the well for assembly, and timely dismantling the reaction frame, the starting steel sleeve and the negative ring duct piece. The section steel supports are erected one by one at intervals of 3m, slurry feeding and discharging pipelines are led into the tunnel through the segment car and the section steel supports and are connected with a pipeline extending device of a rear equipped trolley, slurry discharging pumps are erected at appropriate positions in the pit and are connected with corresponding pipelines, and the other ends of the slurry feeding and discharging pipelines led out of the shield tunneling machine are connected with corresponding pipelines in the pit. After all the equipment goes into the well, the whole shield system is integrally debugged, and then the normal tunneling stage of the shield is started.

In the second step, the guide wall of the U-shaped plain underground continuous wall is manufactured, the quality of the guide wall directly influences the side line and elevation of the underground continuous wall, and the guide wall is an important measure for guiding in a groove, stabilizing the slurry liquid level, maintaining the stability of the upper soil body and preventing the soil body from falling down.

In the second step, the U-shaped plain underground diaphragm wall is constructed in a groove forming mode, the groove forming process adopts a grab bucket 'grabbing method' construction process, the lengths of the main hole and the auxiliary hole are reasonably determined according to the opening degree of a bucket body of the grab bucket, the main hole is grabbed firstly in the construction process, the auxiliary hole is grabbed secondly, the liquid level of the slurry is controlled in the groove digging process, the liquid level of the slurry is guaranteed to be above 1m of the underground water level and not lower than 0.3m of the top surface of the guide wall, and the slurry is timely supplemented when the liquid level falls to prevent collapse.

In the second step, the wall brushing construction of the U-shaped plain underground diaphragm wall is carried out, in order to improve the impermeability and the shearing resistance of the joint, the wall brushing cleaning is carried out on the seam of the advanced wall body at the joint of the diaphragm wall, the soil residue and the mud skin of the joint wall are suspended by a crane and slowly sink into the bottom of the groove, then the wall brushing device is lifted at an intermediate speed, the wall brushing device is made to be tightly attached to the surface of the joint of the wall body to brush the wall, and the wall brushing is repeatedly carried out at the joint for not less than 20 times until the soil residue and the mud skin are completely removed.

In the second step, the concrete of the U-shaped plain underground diaphragm wall is poured, the grading of the concrete not only meets the structural strength requirement, but also meets the construction requirement of the underwater concrete, the concrete has good workability and fluidity, and the slump is tested, the concrete pouring is constructed by adopting a conduit method, and the conduit is in a circular spiral quick joint type with D being 250. And hoisting the guide pipe into the specified position of the groove section by using a concrete pouring frame, and installing a square funnel at the top of the guide pipe.

The technical solution of the present invention is further described below with reference to the accompanying drawings.

As shown in fig. 2 to 5, the slurry shield split starting construction device provided by the invention comprises: the system comprises an originating well 1, a shield tunneling machine 2, a pipe piece 3, a bridge 4, a reaction frame 5, a first trolley 6, a connecting pipeline 7, a second trolley 8, a third trolley 9, a fourth trolley 10, a fifth trolley 11, a sixth trolley 12, a slurry inlet pipe 13, a steel support 14, a steel sleeve 15 and a construction platform 16. The construction method specifically comprises the following construction steps:

firstly, the first stage of construction of split starting comprises the following steps,

(1) and (3) moving the first trolley 6 into the well and horizontally moving the first trolley 6 to be placed in a direction vertical to the line direction, and connecting the first trolley 6 with the bridge 4.

(2) And (3) assembling the steel sleeve 15 and the main machine of the shield tunneling machine 2 from the middle position of the wellhead of the initial end in a well, and translating to the initial end for positioning and mounting as the air shaft enclosure structure concrete support and the steel support 14 need to be avoided.

(3) And (3) connecting the bridge frame 4 with the shield body.

(4) And leading the slurry inlet and outlet pipe 13 out of the slurry-water separation station to the underground and to be vertical to the bottom plate.

(5) The inlet of a slurry inlet pump on the bridge frame 4 and the first trolley 6 is connected with a rubber hose for a slurry inlet pipeline, the number of the rubber hoses is 2, the length of the rubber hoses meets the requirement of a split shield, the outlet of the slurry inlet pump is connected with an elbow (a steel pipe with the same diameter and the same material quality) for a slurry discharge pipeline, and other pipelines between the bridge frame 4 and the first trolley 6 are simultaneously prolonged.

(6) The second carriage 8, the third carriage 9, the fourth carriage 10, the fifth carriage 11, and the sixth carriage 12 are placed on the ground and connected to the first carriage 6 by an extension line.

(7) Before all pipelines are connected, the storage battery car and the two segment pipe car are placed underground to serve as underground horizontal transportation equipment.

(8) Vertical transport is performed using a gantry crane.

(9) And 3, the last segment of segment trolley is adopted for transporting the segments 3, and 3 segments are transported at each time.

(10) Required water stop strips are adhered to the negative ring diaphragm and are assembled in the steel sleeve 15.

(11) Synchronous grouting is preferably adopted for grouting; adopt secondary slip casting when unsatisfied synchronous slip casting requirement, slip casting machine, agitator and slip casting material are placed on the nearest section of jurisdiction car of storage battery car, and the injection thick liquid is single liquid thick liquid, and the relation is counted with propulsion ring to the injection ring number: and (3) spacing between the number of the injection rings and the number of the tunneling rings, namely, the 4 th tunneling ring performs grouting work of the 1 st ring by using a secondary grouting machine.

(12) The tunneling length at the stage can meet the requirement that the first trolley 6 and the second trolley 8 enter the hole and is about 40 m.

Secondly, the construction steps of the second stage of split starting are as follows,

(1) because the synchronous grouting system is positioned on the second trolley 8, in order to start the synchronous grouting system as early as possible, after the condition of tunneling 40m in the first stage is met, the first trolley 6 is aligned and connected with the bridge frame 4, and then the second trolley 8 is put into the well and connected with the first trolley 6.

(2) And (3) installing an elbow on the slurry inlet and outlet pipe at the tail part of the second trolley 8, leading the pipeline joint to a proper position, and connecting the pipeline joint with a corresponding underground pipeline through a rubber hose.

(3) The third carriage 9, the fourth carriage 10, the fifth carriage 11, and the sixth carriage 12 are placed on the ground and connected to the second carriage 8 by an extension line.

(4) The horizontal transportation is grouped into one battery car, two segment cars and one mortar car.

(5) Vertical transport is performed using a gantry crane.

(6) Synchronous grouting is adopted for grouting, and the grouting pressure is slightly higher than the pressure of the muddy water bin by 0.2 bar.

(7) Tunneling is about 70m at the stage, and the requirement that all rear-mounted trolleys enter the tunnel can be met.

Thirdly, the construction steps of the third stage of split starting are as follows,

(1) and after the second stage of tunneling is about 70m, the residual supporting trolleys and equipment are put into the well for assembly, and the reaction frame 5, the starting steel sleeve 15 and the negative ring pipe piece are timely disassembled.

(2) The horizontal transportation marshalling is a section of storage battery car + three section of jurisdiction cars + a section of mortar car, and the section of jurisdiction car that increases is placed in front of the storage battery locomotive for transport slurry pipeline.

(3) Vertical transport is performed using a gantry crane.

(4) And erecting one section steel support every 3m, introducing a slurry inlet and outlet pipeline (steel pipe) and the section steel supports into the tunnel through the segment car, and connecting the pipeline extending device of the fifth trolley 11.

(5) And a slurry inlet pump is erected at a proper position in the well and is connected with the corresponding pipeline.

(6) The other end of the slurry inlet and outlet pipeline led out from the shield tunneling machine 2 is connected with a corresponding underground pipeline.

(7) And after the stage, entering a shield normal tunneling stage.

The technical effects of the present invention will be described in detail with reference to specific embodiments.

TABLE 1 Shield Start scheduling

TABLE 2 Shield construction equipment configuration table

Serial number	Mechanical equipment name	Model number	Number of	Source of equipment	Remarks for note
						1	Slurry balance type shield machine	Φ7020mm	2 table	Self-owned
2	Gantry crane	45t	1 table	Self-owned
						3	Gantry crane	25t	2 table	Self-owned
4	Separation apparatus	ZXSⅡ-1100/20	2 table	Self-owned
						5	Filter pressing equipment	ZXYL-24	2 table	Self-owned
6	Loading machine	ZL50	3 tables	Leasing
						7	Battery car	45t	6 tables	Self-owned
8	Charging machine	KCA-150/380V	9 tables	Self-owned
						9	Segment car	15t	14 tables	Self-owned
10	Mortar vehicle	8M3	5 stands	Self-owned
						11	Axial flow fan	55×2	3 are provided with	Self-owned
12	Generator	180kw	2 table	Self-owned
						13	Mortar mixing station		2 sets of	Self-owned
14	Cooling tower	35m³/h	4 tables	Self-owned
						15	Sewage pump	7.5kw、30m³/h	3 tables	Self-owned
16	Circulating water booster pump	50m³/h	3 tables	Self-owned
						17	Air compressor	9m³	4 tables	Self-owned
18	Double-liquid grouting machine		3 tables	Self-owned
						19	Hydraulic jack	With pumping station 100t	1 set of	Self-owned
20	DC electric welding machine		2 table	Self-owned
						21	Relay pump	400kw	10 tables	Self-owned

TABLE 3 HAIREK S-888 slurry shield tunneling machine parameter table

Serial number	Name (R)	Size of	Weight (t)	Remarks for note
					1	Cutter head	Φ7020mm×1686mm	78
2	Anterior shield	Φ6990mm×2605mm	173
					3	Middle shield	Φ6980mm×3740mm	152
4	Shield tail	Φ6970mm×4464mm	60
					5	Walking beam and erector	5600mm×5043mm×3966mm	23
6	Bridge frame	12619mm×4600mm×3750mm	21
					7	No. 1 trolley	10816mm×4700mm×3750mm	38.5
8	No. 2 trolley	13000mm×4600mm×3800mm	30
					9	No. 3 trolley	11985mm×4600mm×3750mm	20
10	No. 4 trolley	11920mm×4600mm×3750mm	30.5
					11	No. 5 trolley	11692mm×4860mm×3930mm	25
12	6 # trolley	10617mm×4465mm×3340mm	18
					13	Shield overall length (with cutter head)	10982mm
14	Shield body overall length (without cutterhead)	10186mm
					15	Total length/total weight of the whole machine	About 102m	About 700t
16	Gap between shield tail	75mm

Table 4 iron equipment-152 slurry shield machine parameter table

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.

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