A shield machine steel sleeve launching sleeve tail sealing structure and method thereof

Abstract

The application provides a shield machine steel sleeve originating sleeve tail sealing structure and a method thereof, which comprises a steel sleeve and a counterforce frame arranged at the tail of the steel sleeve, the inside of the steel sleeve is provided with an inner ring sleeve, the inner ring sleeve is located at the tail of the steel sleeve and is in contact with the counterforce frame, three grooves are equidistantly arranged on the outer arc surface of the inner ring sleeve, and sealing strips are arranged in the three grooves, two sealing cavities are formed through the contact of the three sealing strips with the inner arc surface of the steel sleeve, cement slurry is filled in the sealing cavity close to the counterforce frame, and sealing grease is filled in the other sealing cavity. Through the arrangement of the inner ring sleeve structure of the steel sleeve and the injection of the shield tail grease and the cement slurry in the sealing chambers isolated by the three sealing strips, better sealing of the tail of the steel sleeve is formed, the longitudinal movement and the transverse constraint stress of the inner ring in the tail of the steel sleeve are ensured, and the shield counterforce is better transmitted to the counterforce frame.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel engineering, in particular to a shield machine steel sleeve starting sleeve tail sealing structure and method. Background Art

[0002] With the rapid development of tunneling and underground space construction, shield construction has been widely used in industries such as underground pipeline networks, urban rail transit construction, and tunnel construction, becoming the preferred construction method for tunneling and underground space projects. During the entire shield construction process, the most critical step is the high risk of shield tunneling initiation. Currently, some projects prefer steel sleeve initiation as the initiation process due to its excellent sealing and high safety. Steel sleeve initiation is suitable for shield initiation in various strata, and its safety and economic benefits are particularly evident in complex and risky strata such as silt and sand. Furthermore, steel sleeves can be reused multiple times, making them highly economical.

[0003] Traditional steel sleeve launching methods often use external jacks placed between the reaction frame and the steel sleeve. The jacks are used to prestress the steel sleeve before launching. However, this method has problems with insufficient and uneven prestressing during practical operation, making it difficult to offset the launching reaction force. The shield reaction force acts directly on the steel sleeve structure, which can easily cause the weld between the steel sleeve transition ring and the portal steel ring to tear, leading to leakage of slurry and filler, and the risk of pressure maintenance failure. Therefore, it is urgent to develop a method for sealing the tail end of the shield machine steel sleeve launching sleeve to solve the stress and sealing problems of the steel sleeve during launching. Summary of the Invention

[0004] The main purpose of the present invention is to provide a shield machine steel sleeve starting sleeve tail sealing structure and method, to solve the problems of uneven reaction force application and insufficient reaction force application in conventional practices. When the shield machine starts, due to the uneven or insufficient reaction force, the steel sleeve bears too much of the longitudinal shield starting reaction force, which causes cracks in the front end of the steel sleeve, and then the problem of water and sand gushing.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a shield machine steel sleeve starting sleeve tail sealing structure, including a steel sleeve and a reaction frame arranged at the tail of the steel sleeve, an inner ring sleeve is arranged inside the steel sleeve, the inner ring sleeve is located at the tail of the steel sleeve and contacts with the reaction frame, three grooves are equidistantly arranged on the outer arc surface of the inner ring sleeve, and sealing strips are arranged in the three grooves. Two sealing cavities are formed by the contact between the three sealing strips and the inner arc surface of the steel sleeve, the sealing cavity close to the reaction frame is filled with cement slurry, and the other sealing cavity is filled with sealing grease.

[0006] In the preferred embodiment, three grouting holes are equidistantly arranged on the inner arc surface of the inner ring sleeve close to the reaction frame side sealing cavity, and eight grease injection holes are equidistantly arranged on the inner arc surface of the inner ring sleeve of the other sealing cavity, and a ball valve is provided in each grouting hole and grease injection hole.

[0007] In a preferred embodiment, the inner ring sleeve and the steel sleeve are both assembled from four arc-shaped pieces.

[0008] In the preferred embodiment, a pre-tightening device is further provided at the top end of the inner sleeve for compressing the sealing strip;

[0009] The pre-tensioning device includes two groups of cable assemblies symmetrically arranged on the left and right and a tightening mechanism connected to the two groups of cable assemblies, wherein the cable assembly includes ear plates arranged on the top arc-shaped piece and the side arc-shaped piece of the steel sleeve, a force groove arranged between the two ear plates and located on the top arc-shaped piece, and a steel wire rope passing through the two ear plates and the force groove and connected to the tightening mechanism. Bolts are provided at both ends of the steel wire rope, and nuts for limiting are threadedly installed on the bolts.

[0010] In a preferred embodiment, the tightening mechanism includes a mounting seat arranged on the center line of the arc-shaped piece at the top of the steel sleeve, a rotary bearing arranged on the mounting seat, a transmission rod penetrating the rotary bearing, a reeling shaft arranged at the front end of the transmission rod, and a drive motor with an output shaft arranged on the back of the mounting seat connected to the tail end of the transmission rod;

[0011] The winding shaft includes an annular shaft body, three annular baffles arranged on the outer arc surface of the annular shaft body and separating it into two winding grooves, connecting support blocks arranged on the opposite inner wall surfaces of the annular shaft body, and a central shaft arranged at the center of the annular shaft body and connected to the two connecting support blocks. The central shaft is connected to the transmission rod. The two winding grooves of the annular shaft body are each provided with a through-hole, and the two through-holes are arranged opposite to each other. The bolts of the wire rope pass through the through-holes and are installed with nuts.

[0012] In a preferred embodiment, a ratchet is further provided on the outside of the transmission rod, and a plurality of pawl assemblies meshing with the ratchet are provided on the mounting seat;

[0013] The pawl assembly includes a vertical plate, a pawl rotatably arranged on the front of the vertical plate and meshing with the ratchet wheel, a support plate arranged on the vertical plate, and an elastic support member arranged on the support plate and in contact with the pawl;

[0014] The elastic support member comprises a telescopic cylinder arranged on the support plate, a tension spring arranged in the telescopic cylinder, and a telescopic head arranged at the end of the tension spring and extending outside the telescopic cylinder to contact the pawl.

[0015] The method includes:

[0016] S1. First install the arc-shaped piece at the bottom of the steel sleeve;

[0017] S2. Assemble the inner sleeve and install sealing strips in the three grooves on the outside of the inner sleeve.

[0018] S3. Install the inner ring sleeve with the sealing strip installed on the arc-shaped piece at the bottom of the steel sleeve;

[0019] S4. Install the arc-shaped pieces on both sides of the steel sleeve, then install the arc-shaped piece on the top of the steel sleeve, and apply pre-tightening force through the pre-tightening device to compress the sealing strip into place;

[0020] S5. Inject sealing grease into the corresponding sealing cavity through the grease injection hole to form a ring.

[0021] S6. Finally, cement slurry is injected into the corresponding sealing cavity through the grouting hole to form a ring.

[0022] In the preferred embodiment, the method of using the pre-tightening device is:

[0023] S1. Insert the bolts at opposite ends of the two wire ropes into the corresponding holes on the reel and install nuts to lock them.

[0024] S2. After the curved piece at the top of the steel sleeve is placed in the installation position, pass the two steel wire ropes through the corresponding two ear plates and the stress grooves, and install nuts at the ends to lock them;

[0025] S3. Finally, the drive motor is started to rotate the reel, thereby reeling in the two steel ropes, thereby pulling the arc-shaped piece on the top of the steel sleeve downward to compress the sealing strip.

[0026] In a preferred embodiment, the sealing grease is injected as follows:

[0027] S1. Open the No. 1 and No. 2 grease injection holes, and use a grease pump to inject grease from the No. 1 grease injection hole. After grease begins to flow out of the No. 2 grease injection hole, the arc-shaped sealing cavity between the No. 1 and No. 2 grease injection holes is completely filled.

[0028] S2, close the No. 1 grease injection hole, open the No. 3 grease injection hole, and inject grease from the No. 2 grease injection hole until grease emerges from the No. 3 grease injection hole. The arc-shaped sealing cavity between the No. 2 and No. 3 grease injection holes is completely filled;

[0029] S3, follow the above steps and so on, complete the grease injection hole No. 4, grease injection hole No. 5, grease injection hole No. 6, grease injection hole No. 7 and grease injection hole No. 8, until grease is injected into the grease injection hole No. 8 and grease comes out of the grease injection hole No. 1;

[0030] S4. Finally, continue to add 1.2 times the theoretical volume of grease into the arc-shaped sealing cavity between the No. 8 grease injection hole and the No. 1 grease injection hole, stop grease injection, and the grease sealing cavity will form a ring as a whole.

[0031] In the preferred solution, the method for injecting the cement slurry is:

[0032] S1, configure the cement slurry according to a water-cement ratio of 1:1.5;

[0033] S2, open the first and second grouting holes for the cement slurry, and inject the cement slurry from the first grouting hole by using a grouting pump, and when the cement slurry comes out of the second grouting hole, the arc-shaped sealing cavity between the first and second grouting holes is filled;

[0034] S3, according to the above steps, sequentially inject the cement slurry into the third grouting hole until the cement slurry comes out of the first grouting hole after the injection of the third grouting hole;

[0035] S4, finally, continue to inject the cement slurry with a volume of 1.2 times the theoretical volume of the arc-shaped sealing cavity between the third grouting hole and the first grouting hole, stop the injection of the cement slurry, and the cement slurry sealing cavity is formed as a whole ring.

[0036] The application provides a shield machine steel sleeve launching sleeve tail sealing structure and a method thereof, which can form better sealing for the tail of the steel sleeve by setting a steel sleeve inner ring sleeve structure and injecting shield tail grease and cement slurry in a sealing chamber separated by three sealing strips, and can ensure the longitudinal movement and transverse constraint stress of the inner ring in the tail of the steel sleeve, better transmit the shield reaction force to the reaction force frame, effectively solve the problem of difficulty in offsetting the launching reaction force caused by insufficient and uneven pre-tensioning, improve the launching process of the steel sleeve, and guarantee the launching quality. BRIEF DESCRIPTION OF DRAWINGS

[0037] The application will be further described below in combination with the drawings and examples:

[0038] Figure 1 is a sectional view of the application;

[0039] Figure 2 is a sectional view of the lower half of the application;

[0040] Figure 3 is a structure diagram of the position relationship of the grease injection hole of the application;

[0041] Figure 4 is a structure diagram of the position relationship of the grouting hole of the application;

[0042] Figure 5 is a structure diagram of the position relationship of the pre-tightening device of the application;

[0043] Figure 6 is a structure diagram of the pre-tightening device of the application;

[0044] Figure 7 is a structure diagram of the ear plate of the application;

[0045] Figure 8 is a structure diagram of the stress groove of the application;

[0046] Figure 9 It is a structural diagram of the tightening mechanism of the present invention;

[0047] Figure 10 It is a structural diagram of the mounting base of the present invention;

[0048] Figure 11 It is a structural diagram of the reel of the present invention;

[0049] Figure 12 is a structural diagram of the ratchet and pawl assembly of the present invention;

[0050] Figure 13 is a structural diagram of the pawl assembly of the present invention;

[0051] Figure 14 This is a schematic diagram of the installation sequence of the steel sleeve and the inner ring sleeve of the present invention;

[0052] In the figure: steel sleeve 1; reaction frame 2; negative ring segment 3; inner ring sleeve 4; shield tail 5; sealing strip 6; grease injection hole 7; No. 1 grease injection hole 71; No. 2 grease injection hole 72; No. 3 grease injection hole 73; No. 4 grease injection hole 74; No. 5 grease injection hole 75; No. 6 grease injection hole 76; No. 7 grease injection hole 77; No. 8 grease injection hole 78; grouting hole 8; No. 1 grouting hole 81; No. 2 grouting hole 82; No. 3 grouting hole 83; preload device 9; ear plate 91; Force groove 92; wire rope 93; tightening mechanism 94; mounting seat 940; rotating bearing 941; transmission rod 942; reel 943; annular shaft 9431; connecting support block 9432; center shaft 9433; through hole 9435; ratchet 945; pawl assembly 946; vertical plate 9461; pawl 9462; support plate 9463; telescopic cylinder 9464; tension spring 9465; telescopic head 9466. DETAILED DESCRIPTION

[0053] Example 1

[0054] like Figure 1-4 As shown, a shield machine steel sleeve starting sleeve tail sealing structure includes a steel sleeve 1 and a reaction frame 2 arranged at the tail of the steel sleeve 1. The steel sleeve 1 is also provided with a negative ring segment 2 and a shield tail 3.

[0055] An inner ring sleeve 4 is provided inside the steel sleeve 1. The inner ring sleeve 4 is located at the tail of the steel sleeve 1 and contacts with the reaction frame 2. The front end of the inner ring sleeve 4 contacts with the tail end of the negative ring segment 2. Three grooves are equidistantly provided on the outer arc surface of the inner ring sleeve 4. A sealing strip 6 is embedded in each of the three grooves. The sealing strip 6 is an EPDM rubber sealing strip. Two sealing cavities are formed by the contact between the three sealing strips 6 and the inner arc surface of the steel sleeve 1. The sealing cavity close to the reaction frame 2 is filled with cement slurry, and the other sealing cavity is filled with sealing grease, so that a better seal can be formed on the tail of the steel sleeve 1. At the same time, the longitudinal movement and lateral constraint of the inner ring sleeve 4 in the tail of the steel sleeve 1 are guaranteed, so as to better transmit the shield reaction force to the reaction frame.

[0056] In the preferred embodiment, three grouting holes 8 are equidistantly arranged on the inner arc surface of the inner ring sleeve 4 of the sealing cavity near the reaction frame 2 side, and eight grease injection holes 7 are equidistantly arranged on the inner arc surface of the inner ring sleeve 4 of the other sealing cavity. A ball valve is provided in each grouting hole 8 and grease injection hole 7, and cement slurry and sealing grease are respectively injected into the two sealing cavities through the three grouting holes 8 and eight grease injection holes 7.

[0057] In a preferred embodiment, the inner ring sleeve 4 and the steel sleeve 1 are both assembled from four arc-shaped pieces, which are bolted together and can be connected to form a complete ring structure.

[0058] Example 2

[0059] Further illustrate with reference to Example 1, Figure 5-13 The structure shown also includes a pre-tightening device 9 provided at the top end of the inner sleeve 4 for compressing the sealing strip 6;

[0060] The pre-tensioning device 9 includes two groups of cable assemblies symmetrically arranged on the left and right and a tightening mechanism 94 connected to the two groups of cable assemblies, wherein the cable assembly includes ear plates 91 arranged on the top arc-shaped piece and the side arc-shaped piece of the steel sleeve 1, a force groove 92 arranged between the two ear plates 91 and located on the top arc-shaped piece, and a wire rope 93 passing through the two ear plates 91 and the force groove 92 and connected to the tightening mechanism 94. Bolts are provided at both ends of the wire rope 93, and nuts for limiting are threadedly installed on the bolts.

[0061] It should be noted that the ear plate 91 and the stress groove 92 are fixed by welding. The ear plate 91 is provided with a hole for the steel wire rope 93 to pass through. The stress groove 92 is a rectangular block with a groove on the top that is adapted to the steel wire rope 93. The ear plate 91 and the stress groove 92 are located on the same horizontal line.

[0062] When in use, by pulling the steel wire rope 93, a downward pre-tightening force can be applied to the arc-shaped piece at the top of the steel sleeve 1, thereby compressing the sealing strip 6 to ensure sealing.

[0063] In the preferred embodiment, the tightening mechanism 94 includes a mounting seat 940 provided on the center line of the arc-shaped piece at the top of the steel sleeve 1, a rotary bearing 941 fixed to the mounting seat 940, a transmission rod 942 passing through the rotary bearing 941, a reeling shaft 943 fixed to the front end of the transmission rod 942, and a driving motor 947 provided on the back of the mounting seat 940 and connected to the rear end of the transmission rod 942 by an output shaft.

[0064] The driving motor 947 and the mounting seat 940 are both fixed to the arc-shaped piece at the top of the steel sleeve 1 by bolts.

[0065] The winding shaft 943 includes an annular shaft body 9431, three annular baffles 9434 arranged on the outer arc surface of the annular shaft body 9431 and separating it into two winding grooves, a connecting support block 9432 arranged on the opposite inner wall surfaces of the annular shaft body 9431, and a central shaft 9433 arranged at the center of the annular shaft body 9431 and connected to the two connecting support blocks 9432. The central shaft 9433 is connected to the transmission rod 942. The two winding grooves of the annular shaft body 9431 are each provided with a through hole 9435, and the two through holes 9435 are arranged opposite to each other. The bolts of the wire rope 93 pass through the through holes 9435 and are installed with nuts.

[0066] Among them, the annular shaft body 9431, the connecting support block 9432 and the central axis 9433 are integrally formed, and the connecting support block 9432 is trapezoidal.

[0067] When in use, the reel 943 is driven to rotate by the driving motor 947, thereby driving the steel wire ropes 93 on both sides to be reeled and tightened synchronously, thereby achieving the effect of automatically tightening the steel wire ropes 93.

[0068] In a preferred embodiment, a ratchet 945 is further provided on the outside of the transmission rod 942, and a plurality of pawl assemblies 946 engaged with the ratchet 945 are provided on the mounting seat 940. In this embodiment, the number of the pawl assemblies 946 is two;

[0069] When in use, the pawl assembly 946 cooperates with the ratchet wheel 945 so that the reel 943 can only rotate in one direction, thereby preventing the wire rope 93 from loosening in the absence of power.

[0070] The pawl assembly 946 includes a vertical plate 9461 fixed to the mounting base 940, a pawl 9462 rotatably mounted on the front of the vertical plate 9461 and engaged with the ratchet 945, a support plate 9463 fixed to the vertical plate 9461, and an elastic support member fixed to the support plate 9463 and in contact with the pawl 9462.

[0071] The elastic support includes a telescopic cylinder 9464 fixed on the support plate 9463, a tension spring 9465 arranged in the telescopic cylinder 9464, and a telescopic head 9466 arranged at the end of the tension spring 9465 and extending to the outside of the telescopic cylinder 9464 and abutting against the pawl 9462, the abutting end of the telescopic head 9466 being spherical, so that the pawl 9462 is kept engaged with the ratchet 945 through the telescopic head 9466, and the tension spring 9465 is protected from other interference through the telescopic cylinder 9464.

[0072] Embodiment 3

[0073] Further illustrated in combination with Embodiments 1 and 2, as shown in the structure, a shield machine steel sleeve originating sleeve tail sealing method, the method comprising: Figure 1-14

[0074] S1, first install the arc-shaped piece at the bottom of the steel sleeve 1;

[0075] S2, assemble the inner ring sleeve 4, and install the sealing strip 6 in the three grooves outside the inner ring sleeve 4;

[0076] S3, install the inner ring sleeve 4 with the installed sealing strip 6 on the arc-shaped piece at the bottom of the steel sleeve 1;

[0077] S4, install the arc-shaped pieces on both sides of the steel sleeve 1, then install the arc-shaped piece at the top of the steel sleeve 1, and apply a pre-tightening force through the pre-tightening device 9 to compress the sealing strip 6 in place;

[0078] S5, inject sealing grease into the corresponding sealing cavity through the grease injection hole 7 to form a ring,

[0079] S6, finally inject cement slurry into the corresponding sealing cavity through the grouting hole 8 to form a ring.

[0080] In a preferred embodiment, the use method of the pre-tightening device 9 is:

[0081] S1, insert the bolts at the opposite ends of the two steel wires 93 into the corresponding through holes 9435 on the winding shaft 943, and install nuts for locking;

[0082] S2, after the arc-shaped piece at the top of the steel sleeve 1 is placed in the installation position, pass the two steel wires 93 through the corresponding two ear plates 91 and the stress groove 92, and install nuts at the ends for locking;

[0083] S3, finally start the driving motor 947 to rotate the winding shaft 943, thereby winding the two steel wires 93, and thereby pulling down the arc-shaped piece at the top of the steel sleeve 1 to compress the sealing strip 6.

[0084] In a preferred embodiment, the injection method of the sealing grease is: ​

[0085] S1. Open the first and second grease injection holes 71 and 72, and use a grease pump to inject grease from the first grease injection hole 71. After grease begins to flow out of the second grease injection hole 72, the arc-shaped sealed cavity between the first and second grease injection holes 71 and 72 is completely filled.

[0086] S2, close the No. 1 grease injection hole 71, open the No. 3 grease injection hole 73, and inject grease from the No. 2 grease injection hole 72 until grease emerges from the No. 3 grease injection hole 73. The arc-shaped sealing cavity between the No. 2 grease injection hole 72 and the No. 3 grease injection hole 73 is completely filled;

[0087] S3, follow the above steps and so on, complete the grease injection hole No. 4 74, No. 5 75, No. 6 76, No. 7 7 and No. 8 78, until the grease injection hole No. 8 78 is finally filled and grease emerges from the No. 1 grease injection hole 71;

[0088] S4. Finally, continue to add 1.2 times the theoretical volume of grease in the arc-shaped sealing cavity between the eighth grease injection hole 78 and the first grease injection hole 71, stop grease injection, and the grease sealing cavity forms a ring as a whole.

[0089] In a preferred embodiment, the cement slurry is injected as follows:

[0090] S1. Prepare cement slurry at a water-cement ratio of 1:1.5;

[0091] S2, open the cement slurry and inject it into the No. 1 grouting hole 81 and the No. 2 grouting hole 82. Use a grouting pump to inject from the No. 1 grouting hole 81. When the cement slurry emerges from the No. 2 grouting hole 82, the arc-shaped sealed cavity between the No. 1 grouting hole 81 and the No. 2 grouting hole 82 is completely filled.

[0092] S3, follow the above steps and so on until the last grouting hole 83 is filled and cement slurry emerges from the last grouting hole 81;

[0093] S4. Finally, continue to inject 1.2 times the theoretical volume of cement slurry into the arc-shaped sealing cavity between the No. 3 grouting hole 83 and the No. 1 grouting hole 81, stop injecting the cement slurry, and the cement slurry sealing cavity forms a ring as a whole.

[0094] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A shield machine steel sleeve starting sleeve tail sealing structure, comprising a steel sleeve (1) and a reaction frame (2) arranged at the tail of the steel sleeve (1), characterized in that: An inner ring sleeve (4) is provided inside the steel sleeve (1), the inner ring sleeve (4) is located at the tail of the steel sleeve (1) and contacts the reaction frame (2), three grooves are provided at equal intervals on the outer arc surface of the inner ring sleeve (4), and sealing strips (6) are provided in each of the three grooves. Two sealing cavities are formed by the contact between the three sealing strips (6) and the inner arc surface of the steel sleeve (1), the sealing cavity close to the reaction frame (2) is filled with cement slurry, and the other sealing cavity is filled with sealing grease; The inner ring sleeve (4) and the steel sleeve (1) are both assembled from four arc-shaped pieces; It also includes a pre-tightening device (9) arranged at the top end of the inner ring sleeve (4) for compressing the sealing strip (6); The pre-tightening device (9) includes two groups of cable assemblies symmetrically arranged on the left and right and a tightening mechanism (94) connected to the two groups of cable assemblies, wherein the cable assembly includes an ear plate (91) arranged on the top arc piece and the side arc piece of the steel sleeve (1), a stress groove (92) arranged between the two ear plates (91) and located on the top arc piece, and a steel wire rope (93) passing through the two ear plates (91) and the stress groove (92) and connected to the tightening mechanism (94), and bolts are arranged at both ends of the steel wire rope (93), and nuts for limiting are threadedly installed on the bolts.

2. The shield machine steel sleeve starting sleeve tail sealing structure according to claim 1, characterized in that: Three grouting holes (8) are equidistantly arranged on the inner arc surface of the inner ring sleeve (4) of the sealing cavity on the side of the reaction frame (2), and eight grease injection holes (7) are equidistantly arranged on the inner arc surface of the inner ring sleeve (4) of the other sealing cavity, and a ball valve is provided in each of the grouting holes (8) and the grease injection holes (7).

3. The shield machine steel sleeve starting sleeve tail sealing structure according to claim 2, characterized in that: The tightening mechanism (94) includes a mounting seat (940) arranged on the center line of the arc-shaped piece at the top of the steel sleeve (1), a rotary bearing (941) arranged on the mounting seat (940), a transmission rod (942) penetrating the rotary bearing (941), a reeling shaft (943) arranged at the front end of the transmission rod (942), and a driving motor (947) connected to an output shaft at the back of the mounting seat (940) and the rear end of the transmission rod (942). The reel (943) comprises an annular shaft body (9431), three annular baffles (9434) arranged on the outer arc surface of the annular shaft body (9431) and separating the two reeling grooves, a connecting support block (9432) arranged on the opposite inner wall surface of the annular shaft body (9431), and a central shaft (9433) arranged at the center of the annular shaft body (9431) and connected to the two connecting support blocks (9432). The central shaft (9433) is connected to the transmission rod (942). The two reeling grooves of the annular shaft body (9431) are both provided with a through hole (9435), and the two through holes (9435) are arranged opposite to each other. The bolts of the wire rope (93) pass through the through holes (9435) and are installed with nuts.

4. The shield machine steel sleeve starting sleeve tail sealing structure according to claim 3, characterized in that: A ratchet (945) is further provided on the outside of the transmission rod (942), and a plurality of pawl assemblies (946) engaged with the ratchet (945) are provided on the mounting seat (940); The pawl assembly (946) includes a vertical plate (9461), a pawl (9462) rotatably arranged on the front of the vertical plate (9461) and meshing with the ratchet (945), a support plate (9463) arranged on the vertical plate (9461), and an elastic support member arranged on the support plate (9463) and in contact with the pawl (9462); The elastic support member includes a telescopic cylinder (9464) arranged on a support plate (9463), a tension spring (9465) arranged in the telescopic cylinder (9464), and a telescopic head (9466) arranged at the end of the tension spring (9465) and extending outside the telescopic cylinder (9464) to contact the pawl (9462).

5. The sealing method for the shield machine steel sleeve starting sleeve tail sealing structure according to claim 3, characterized in that: The method includes: S1. First, install the arc-shaped piece at the bottom of the steel sleeve (1); S2, assembling the inner ring sleeve (4) and installing the sealing strips (6) in the three grooves on the outside of the inner ring sleeve (4); S3. Install the inner ring sleeve (4) with the sealing strip (6) installed on the arc-shaped piece at the bottom of the steel sleeve (1); S4. Install the arc-shaped pieces on both sides of the steel sleeve (1), then install the arc-shaped piece on the top of the steel sleeve (1), and apply pre-tightening force through the pre-tightening device (9) to compress the sealing strip (6) into place; S5. Inject sealing grease into the corresponding sealing cavity through the grease injection hole (7) to form a ring. S6. Finally, cement slurry is injected into the corresponding sealing cavity through the grouting hole (8) to form a ring.

6. The sealing method for the shield machine steel sleeve starting sleeve tail sealing structure according to claim 5, characterized in that: The method of using the pre-tightening device (9) is as follows: S1. Insert the bolts at opposite ends of the two wire ropes (93) into the corresponding through holes (9435) on the reel (943), and install nuts to lock them; S2. After the top arc-shaped piece of the steel sleeve (1) is placed in the installation position, the two steel wire ropes (93) are passed through the corresponding two ear plates (91) and the stress groove (92), and nuts are installed at the ends to lock them; S3. Finally, the driving motor (947) is started to rotate the reel (943), thereby reeling in the two steel ropes (93), thereby tightening the arc-shaped piece at the top of the steel sleeve (1) downward and compressing the sealing strip (6).

7. The sealing method for the shield machine steel sleeve starting sleeve tail sealing structure according to claim 5, characterized in that: The injection method of the sealing grease is: S1, open the No. 1 grease injection hole (71) and the No. 2 grease injection hole (72), use a grease pump to inject grease from the No. 1 grease injection hole (71), and after grease emerges from the No. 2 grease injection hole (72), the arc-shaped sealing cavity between the No. 1 grease injection hole (71) and the No. 2 grease injection hole (72) is filled; S2, close the No. 1 grease injection hole (71), open the No. 3 grease injection hole (73), and inject grease from the No. 2 grease injection hole (72) until grease emerges from the No. 3 grease injection hole (73), and the arc-shaped sealing cavity between the No. 2 grease injection hole (72) and the No. 3 grease injection hole (73) is filled; S3, according to the above steps and so on, complete the fourth grease injection hole (74), the fifth grease injection hole (75), the sixth grease injection hole (76), the seventh grease injection hole (77) and the eighth grease injection hole (78), until the grease is injected into the eighth grease injection hole (78) and the grease comes out of the first grease injection hole (71); S4. Finally, continue to add 1.2 times the theoretical amount of grease in the arc-shaped sealing cavity between the eighth grease injection hole (78) and the first grease injection hole (71), stop grease injection, and the grease sealing cavity is formed into a ring as a whole.

8. The sealing method for the shield machine steel sleeve starting sleeve tail sealing structure according to claim 5, characterized in that: The injection method of the cement slurry is: S1. Prepare cement slurry at a water-cement ratio of 1:1.5; S2, opening the cement slurry and injecting it into the No. 1 grouting hole (81) and the No. 2 grouting hole (82), using a grouting pump to inject from the No. 1 grouting hole (81), when the cement slurry emerges from the No. 2 grouting hole (82), the arc-shaped sealing cavity between the No. 1 grouting hole (81) and the No. 2 grouting hole (82) is completely filled; S3, follow the above steps and so on until cement slurry emerges from the last grouting hole (81) after the third grouting hole (83) is injected; S4. Finally, continue to inject 1.2 times the theoretical volume of cement slurry into the arc-shaped sealing cavity between the No. 3 grouting hole (83) and the No. 1 grouting hole (81), stop injecting the cement slurry, and the cement slurry sealing cavity will form a ring as a whole.

Images