Pipe jacking receiving tunnel portal sealing device for deep and weak silt layer

Abstract

The utility model provides a sealing device for a pipe jacking receiving tunnel portal in a deep and weak silt layer. The sealing device comprises a steel ring, a sealing brush, a tunnel portal embedded steel ring and a grouting pipe. The device is characterized in that the multiple sealing brushes are arranged on one side of the inner surface of the steel ring in a circumferential arrangement mode; the sealing brushes are hinged; the hole pre-embedded steel ring is welded with one side of the outer surface of the steel ring; the hole pre-embedded steel ring is pre-embedded in a hole concrete structure; and the grouting pipe is annularly arranged on the hole pre-embedded steel ring. The sealing brush is installed in the steel ring, is in fine contact with the pipe piece and mainly prevents water, mud and the like from rushing into a receiving well along the periphery of the pipe piece, the pipe piece can be fixed in a threaded connection mode or a welded connection mode or other modes, installation can be fast, construction is easy and convenient, construction efficiency is high, and good feasibility is achieved; the safety, feasibility and construction efficiency in the pipe jacking starting process can be better improved, and the problems of water gushing, sand gushing and mud gushing are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of trenchless construction, in particular to a sealing device for a jacking pipe receiving tunnel door in a thick and weak silt layer. Background Art

[0002] Pipe jacking is a trenchless pipeline construction technology used in the field of construction for complex geology and many ground structures. It has less impact on the surrounding environment, a small construction site, low noise, and is less affected by natural conditions. The general construction process is to first excavate the starting well for pipe jacking, excavate with a pipe jacking machine, and use the thrust of the jack main jacking cylinder and the relay room between pipes to push from the rear of the pipe jacking machine and the tool pipe, and push the tool pipe or pipe jacking machine from the starting well through the soil layer to the receiving well and lift it. In the process of pipe jacking reception (entering the hole), due to the presence of overburden on the top of the pipe, the machine head enters the receiving well under the action of soil pressure. At this time, there is a gap between the machine head and the finished pipe and the receiving hole, which is prone to risks such as water and mud gushing, greatly affecting construction safety. This problem often occurs, especially in deep and weak silt layers. There are generally three solutions to this problem. One is to use a block-type sealing door to seal the tunnel portal, but this method is only used for tunnel portals within a buried depth of 5m and when the water and soil pressure is relatively small; the second is to use steel sheet piles to seal the door, but this method is expensive, and the steel sheet piles must be pulled out and then backfilled with clay or fly ash; the third is to use steel sealing doors in the well. For example, there are already published patents (a water-stopping device for tunnel jacking portals, a municipal jacking working well portal sealing device, a pre-buried water-stopping device for jacking starting portals and shafts and its construction process, a shield portal adjustable angle steel ring and pipeline structure). However, this type of method is used in shield construction technology and mainly emphasizes water-stopping performance, but its ability to prevent sand and mud gushing is weak, and the process is complicated, requiring many pre-buried components and difficult installation. Utility Model Content

[0003] The purpose of the utility model is to provide a sealing device for a jacking receiving tunnel door in a thick and weak silt layer, which can better improve the safety, feasibility and construction efficiency of the jacking process and avoid the problems of water, sand and mud gushing.

[0004] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions: a deep and weak silt layer top pipe receiving tunnel sealing device, including a steel ring, a sealing brush, a tunnel entrance embedded steel ring and a grouting pipe; wherein: the sealing brushes are provided in plurality and are arranged circumferentially on one side of the inner surface of the steel ring; the sealing brushes are hinged; the tunnel entrance embedded steel ring is welded to one side of the outer surface of the steel ring; the tunnel entrance embedded steel ring is embedded in the tunnel entrance concrete structure; the grouting pipe is circumferentially arranged on the tunnel entrance embedded steel ring.

[0005] As a further improvement of the technical solution of the present utility model, the sealing brush includes a sealing brush steel guard plate, a sealing brush protection plate, a steel wire and a curtain rubber plate; the sealing brush steel guard plate is welded to one side of the inner surface of the steel ring; the steel wire is provided in multiple bundles; one end of the steel wire is fixed in the sealing brush steel guard plate, and the other end is bent downward in a V shape to emerge from the sealing brush steel plate; the curtain rubber plate is arranged on one side of the steel wire that is close to the finished pipe, and the sealing brush protection plate is arranged on the other side of the steel wire away from the finished pipe.

[0006] As a further improvement of the technical solution of the present invention, the grouting pipe includes a grouting steel pipe, a spiral cover and a check valve; both ends of the grouting steel pipe are provided with threaded connection ports; the spiral cover is threadedly connected to the lower end of the grouting steel pipe; and the check valve is threadedly connected to the upper end of the grouting steel pipe.

[0007] As a further improvement of the technical solution of the present invention, the pre-embedded steel ring of the opening includes a pre-embedded steel ring body, a flange steel plate and anchor bars; the flange steel plates are arranged at both ends of the pre-embedded steel plates; and the anchor bars are arranged on the flange steel plates.

[0008] As a further improvement of the technical solution of the present invention, the material of the steel ring is Q235 steel, the width of the steel ring is 20 to 30 cm, and the thickness of the steel ring is 15 to 30 mm.

[0009] As a further improvement to the technical solution of the present invention, the material of the pre-embedded steel ring at the hole is Q235 steel.

[0010] As a further improvement to the technical solution of the present utility model, the grouting pipe is made of Q235 steel.

[0011] As a further improvement to the technical solution of the present invention, the sealing brush protection plate is made of 65Mn material with a thickness of 1.0 mm.

[0012] As a further improvement to the technical solution of the present invention, the steel wire is 0.35 martensitic stainless steel wire.

[0013] The utility model can better improve the safety, feasibility and construction efficiency of the pipe jacking process, avoid the problems of water gushing, sand gushing and mud gushing, and has the following beneficial effects:

[0014] (1) The device uses a sealing brush, which is installed inside the steel ring and in fine contact with the pipe segment. It mainly prevents water, mud, etc. from flowing into the receiving well along the pipe segment. It is a key sealing measure to prevent water, sand, and mud from gushing during the receiving process. The various components of the device can be fixed by screw connection or welding connection. It can be installed quickly, is easy to construct, has high construction efficiency, and has good feasibility.

[0015] (2) The utility model utilizes prefabricated sealing brushes, which are easy to obtain. The steel rings can be directly prefabricated and are easy to manufacture. The sealing device of the sealing brush + steel ring can be manufactured in advance and installed when the pipe jacking machine is about to be received, thereby improving construction efficiency. In addition, the pre-buried steel rings can be provided with grouting pipes to reinforce the soil behind the tunnel portal, thereby increasing the strength of the soil and preventing sudden water and soil surges.

[0016] (3) The device is economical, easy to manufacture and construct, easy to obtain materials, and easy to promote and apply.

[0017] (4) The device can be used in working wells of different shapes, such as rectangular and circular, and has good applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 This is a front structural diagram of a sealing device for a jacking pipe receiving tunnel in a thick and weak silt layer according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of a sealing device for a jacking pipe receiving tunnel in a thick and weak silt layer according to an embodiment of the present invention;

[0021] Figure 3 This is a side structural diagram of a sealing device for a jacking pipe receiving tunnel in a thick and weak silt layer according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic structural diagram of a sealing brush according to an embodiment of the present utility model;

[0023] Figure 5 This is a structural diagram of the pipe joint receiving portion of an embodiment of the utility model;

[0024] Figure 6 This is a structural diagram of the pipe section receiving process according to an embodiment of the utility model;

[0025] Figure 7 This is a front structural diagram of the pre-embedded steel ring in the hole of the embodiment of the utility model;

[0026] Figure 8 for Figure 7 1-1 cross-sectional schematic diagram;

[0027] Figure 9 This is a front view of the embodiment of the utility model, wherein the pre-buried steel ring of the hole is assembled with the steel ring, the sealing brush and the grouting pipe;

[0028] Figure 10This is a side schematic diagram of the pre-buried steel ring at the hole of an embodiment of the utility model being assembled with the steel ring, sealing brush and grouting pipe respectively.

[0029] Figure 11 This is a schematic structural diagram of a grouting pipe according to an embodiment of the present utility model.

[0030] In the attached figure: 1-steel ring; 2-sealing brush; 3-embedded steel ring at the opening; 4-concrete structure of the opening; 5-finished pipe; 6-grouting pipe; 21-sealing brush steel guard plate; 22-sealing brush protection plate; 23-steel wire; 24-curtain rubber sheet; 31-anchor bar; 32-embedded steel ring body; 33-flange steel plate; 61-grouting steel pipe; 62-screw cover; 63-check valve. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In this utility model, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, "connection" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0034] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include at least one such feature. Furthermore, the technical solutions of various embodiments may be combined with each other, but only on the basis that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions contradicts or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] The present invention will be described in further detail below with reference to the accompanying drawings.

[0036] like Figures 1 to 11 As shown, a sealing device for a top pipe receiving tunnel portal in a deep and weak silt layer comprises a steel ring 1, a sealing brush 2, a pre-embedded steel ring 3 for the tunnel portal and a grouting pipe 6; wherein: the sealing brushes 2 are provided in plurality and are arranged circumferentially on one side of the inner surface of the steel ring 1; the sealing brushes 2 are hinged; the pre-embedded steel ring 3 for the tunnel portal is welded to one side of the outer surface of the steel ring 1; the pre-embedded steel ring 3 for the tunnel portal is embedded in the concrete structure 4 for the tunnel portal; and the grouting pipe 6 is circumferentially arranged on the pre-embedded steel ring 3 for the tunnel portal.

[0037] Specifically, in this embodiment, the sealing brush 2 includes a sealing brush steel guard plate 21, a sealing brush protection plate 22, a steel wire 23 and a curtain rubber plate 24; the sealing brush steel guard plate 21 is welded to one side of the inner surface of the steel ring 1; the steel wire 23 is provided with multiple bundles; one end of the steel wire 23 is fixed in the sealing brush steel guard plate 21, and the other end is bent downward in a V shape to emerge from the sealing brush steel plate; the curtain rubber plate 24 is arranged on one side of the steel wire 23 close to the finished pipe 5, and the sealing brush protection plate 22 is arranged on the other side of the steel wire 23 away from the finished pipe 5.

[0038] Specifically, in this embodiment, the grouting pipe 6 includes a grouting steel pipe 61, a spiral cover 62 and a check valve 63; both ends of the grouting steel pipe 61 are provided with threaded connection ports; the spiral cover 62 is threadedly connected to the lower end of the grouting steel pipe 61; the check valve 63 is threadedly connected to the upper end of the grouting steel pipe 61.

[0039] Specifically, in this embodiment, the hole embedded steel ring 3 includes an embedded steel ring body 32, a flange steel plate 33 and anchor bars 31; the flange steel plates 33 are arranged at both ends of the embedded steel plates; and the anchor bars 31 are arranged on the flange steel plates 33.

[0040] The utility model can better improve the safety, feasibility and construction efficiency of the pipe jacking process, avoid the problems of water gushing, sand gushing and mud gushing, and has the following beneficial effects:

[0041] (1) The device uses a sealing brush, which is installed inside the steel ring and in fine contact with the pipe segment. It mainly prevents water, mud, etc. from flowing into the receiving well along the pipe segment. It is a key sealing measure to prevent water, sand, and mud from gushing during the receiving process. The various components of the device can be fixed by screw connection or welding connection. It can be installed quickly, is easy to construct, has high construction efficiency, and has good feasibility.

[0042] (2) The utility model utilizes prefabricated sealing brushes, which are easy to obtain. The steel rings can be directly prefabricated and are easy to manufacture. The sealing device of the sealing brush + steel ring can be manufactured in advance and installed when the pipe jacking machine is about to be received, thereby improving construction efficiency. In addition, the pre-buried steel rings can be provided with grouting pipes to reinforce the soil behind the tunnel portal, thereby increasing the strength of the soil and preventing sudden water and soil surges.

[0043] (3) The device is economical, easy to manufacture and construct, easy to obtain materials, and easy to promote and apply.

[0044] (4) The device can be used in working wells of different shapes, such as rectangular and circular, and has good applicability.

[0045] Example:

[0046] This device comprises four parts: a steel ring 1, a sealing brush 2, a pre-embedded steel ring 3 for the tunnel entrance, and a grouting pipe 6. The sealing brush 2 comprises a sealing brush steel guard plate 21, a sealing brush protection plate 22, a steel wire 23, and a curtain rubber plate 24. The grouting pipe 6 comprises a grouting steel pipe 61, a screw cap 62, and a check valve 63. The pre-embedded steel ring 3 for the tunnel entrance receives conventional construction components for the jacking pipe, the concrete structure 4 for the tunnel entrance is a conventional tunnel entrance structure, and the finished pipe 5 is a construction pipeline. The positions and connection relationships of the various components are as follows: the inner surface of the steel ring 1 is welded to the sealing brush steel guard plate 21 of the sealing brush 2, the sealing brush 2 is prefabricated, and the sealing brushes are hinged; the pre-embedded steel ring 3 for the tunnel entrance is welded to the outer surface of the steel ring 1 and is pre-embedded in the concrete structure 4 for the tunnel entrance; the pre-embedded steel ring 3 is fixed to the concrete structure 4 for the tunnel entrance, and the pre-embedded steel ring is located within the concrete structure; the grouting pipe 6 is fixed to the pre-embedded steel ring 3 for the tunnel entrance and the concrete structure 4 for the tunnel entrance.

[0047] The steel ring 1 is required to have a certain strength and rigidity. It is made of Q235 steel, with a width of 20 to 30 cm and a thickness of 15 to 30 mm (the steel material and specifications can be adjusted according to the actual situation on site). The length is adjusted according to the size of the receiving hole. It is made by a plate rolling machine to ensure the accuracy of the shape. The long steel plate is used as the original. After the bending is completed, the joints are fully welded on both sides to complete the production. Generally, its outer diameter should be 2 to 3 cm smaller than the inner diameter of the pre-buried steel ring 3 in the hole to facilitate welding connection. One side of the inner surface of the steel ring 1 and the sealing brush steel guard plate 21 of the sealing brush 2 are continuously fully welded to ensure the stability and tightness of the connection. The main functions of this component are mainly four: first, it has sufficient strength to serve as the main skeleton of the sealing device; second, as the main component of the device, it is used to connect other device components and serve as a fixed base surface for the sealing brush 2; third, it is made of long steel plates, and the production and construction difficulty is small.

[0048] The sealing brush 2 can be prefabricated or made on-site. The single-piece base is 15 cm, and the 2.2 protective plate is made of 65Mn material with a thickness of 1.0 mm. It is heat-treated with a special process to HRC45 ± 2. The angle change is less than 5 degrees, ensuring that the angle support achieves sealing and protects the stainless steel wire. The stainless steel wire is 0.35 martensitic stainless steel wire, which is treated with a special bending process. The irregular bending meets the coating amount of sealing grease, thereby achieving the sealing effect. The stainless steel wire of the sealing brush protrudes from the front in a V-shape on both sides to ensure the sealing of the installation joint. The sealing brush steel guard plate 21 is tightly attached to the inner side of the steel ring 1 and welded. After welding is completed, the next sealing brush is connected until the entire inner side of the steel ring 1 is covered with sealing brushes 2. The sealing brushes 2 are hinged by a card plate to ensure a certain degree of flipping performance. A curtain rubber plate 24 is set close to one side of the finished pipe of the sealing brush. The curtain rubber plate is arranged along the periphery of the side close to the finished pipe 5. The radial nylon lines of the curtain rubber plate are densely arranged, and the horizontal cotton lines are sparsely arranged. The curtain rubber sheet is pressed in blocks by a mold and then connected into a complete frame by a sealing brush. It has three functions: first, it prevents sand, mud, and water from flowing into the receiving well during the jacking process, ensuring construction safety; second, it uses finished products, which are easy to obtain and simple to construct, and can be dismantled and recycled after the construction is completed; third, it has strong adaptability. The sealing brush wire has a certain degree of ductility and good deformation ability, which allows it to tightly adhere to the finished pipe with a smaller outer diameter after being received by the jacking machine head with a larger outer diameter; fourth, the curtain rubber sheet protects the finished pipe from scratches, and its certain flexibility makes it compressed during the jacking process, enhancing the sealing effect.

[0049] The pre-embedded steel ring 3 at the tunnel entrance is required to possess a certain level of strength and rigidity. Made of Q235 steel, its specifications are tailored to the actual size of the tunnel portal. The outer side of the pre-embedded steel ring 3 is bonded to the portal concrete structure 4. The inner side of the pre-embedded steel ring 3 is welded to the steel ring 1. This serves two purposes: first, it bonds with the concrete, ensuring the overall stability of the sealing device; second, it serves as a welding surface for the sealing device, facilitating the welding of the steel ring 1.

[0050] The said opening concrete structure 4 has a strength grade of at least C40 and is cast after the installation of the pre-buried steel ring 3 of the opening. It is required to be cast and vibrated densely and fully cured. Its position is the opening structure and its function is to reinforce the surrounding structure of the opening.

[0051] The grouting pipe 6 is made of Q235 steel pipe, φ60×3.5mm, and its length is adjusted according to the actual width of the on-site tunnel portal. It is welded with steel bars and fixed with concrete, and arranged in a circumferential direction at the embedded steel ring. Threaded connection ports are set at both ends of the grouting pipe, and are connected to the screw cover 62 and the check valve 63 through threads. Its functions are: first, grouting and reinforcing the soil behind the tunnel portal through the grouting pipe; second, preventing water and soil from flowing into the grouting pipe through the check valve; third, protecting the inside of the grouting pipe through the screw cover.

[0052] Introduction to other parts: The function of the finished pipe 5 is to form a jacking pipeline.

[0053] The construction process of this utility model is as follows:

[0054] The first step is to complete the production of the steel ring 1, and make the long steel plate into the steel ring 1;

[0055] The second step is to prepare the sealing brush 2 and weld the sealing brushes one by one to the inner surface of the steel ring 1. After each sealing brush is welded, the next sealing brush is inserted into the completed sealing brush through the sealing brush protection plate 22 and then welded to the steel ring 1. Repeat the above steps until the sealing brush 2 is installed on the entire inner side of the steel ring 1.

[0056] The third step is to use a water-grinding drill and repeated measurements to determine the center position of the pipe jacking machine when it is about 2m away from the receiving well, so as to determine the position of the tunnel portal. After the position is determined, the tunnel portal is constructed, the pre-buried steel ring 3 and grouting pipe 6 of the tunnel portal are installed, and the tunnel portal concrete structure 4 is poured and cured for 7 days.

[0057] The fourth step is to use the hoisting equipment to hoist the prepared steel ring + sealing brush sealing device to the inner side of the pre-embedded steel ring 3 of the tunnel entrance after the construction is completed, and to perform full welding to fix it. The exposed side of the sealing brush 2 is required to face the inside of the receiving well, and the shield tail grease is pressurized on the sealing brush 2. At the same time, cement or polyurethane slurry is injected into the soil behind the tunnel portal through the grouting pipe according to the hydrogeological conditions. The grouting pressure is controlled between 0.2-0.5Mpa. After the grouting is completed, it is sealed;

[0058] Step 5: After the tunnel entrance concrete structure 4 has been fully cured, the hydraulic jack is activated to continue the jacking construction until the tunnel entrance is broken open and the pipe jacking machine is successfully received. Ensure that there are no problems such as water, mud, and sand gushing during the receiving process.

[0059] The sealing device for receiving tunnel portals of top pipes in deep and weak silt layers provided by the utility model has achieved the following beneficial effects: 1. The sealing device can effectively prevent problems such as water gushing, mud gushing, sand gushing, etc., and has a good sealing effect; 2. The protective device of the utility model can be used for the construction of various types of tunnel portal sections and has a wide range of applicability; 3. The sealing device is simple to manufacture and easy to install, and can greatly speed up the construction speed and improve the construction efficiency; 4. The production cost of the protective device is relatively small, and it has good economy.

[0060] It should be noted that all the dimensions given above are only reference values ​​for this utility model patent; the steel plate used in this utility model takes Q235 steel as an example, but all other types of steel can also be used.

[0061] The above is a detailed introduction to the technical solutions provided by the embodiments of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A sealing device for a jacking pipe receiving tunnel in a thick and weak silt layer, comprising a steel ring, a sealing brush, a pre-buried steel ring at the tunnel entrance, and a grouting pipe; characterized in that: The sealing brushes are provided in plurality and arranged circumferentially on one side of the inner surface of the steel ring; the sealing brushes are hinged; the hole-embedded steel ring is welded to one side of the outer surface of the steel ring; the hole-embedded steel ring is embedded in the hole-embedded concrete structure; the grouting pipe is circumferentially arranged on the hole-embedded steel ring.

2. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 1 is characterized in that: The sealing brush includes a sealing brush steel guard plate, a sealing brush protection plate, a steel wire and a curtain rubber plate; the sealing brush steel guard plate is welded to one side of the inner surface of the steel ring; the steel wire is provided in multiple bundles; one end of the steel wire is fixed in the sealing brush steel guard plate, and the other end is bent downward in a V shape to emerge from the sealing brush steel plate; the curtain rubber plate is arranged on the side of the steel wire that is close to the finished pipe, and the sealing brush protection plate is arranged on the other side of the steel wire that is away from the finished pipe.

3. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 1 is characterized in that: The grouting pipe includes a grouting steel pipe, a screw cover and a check valve; both ends of the grouting steel pipe are provided with threaded connection ports; the screw cover is threadedly connected to the lower end of the grouting steel pipe; the check valve is threadedly connected to the upper end of the grouting steel pipe.

4. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 1 is characterized in that: The hole embedded steel ring includes an embedded steel ring body, a flange steel plate and anchor bars; the flange steel plates are arranged at both ends of the embedded steel plates; and the anchor bars are arranged on the flange steel plates.

5. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 1 is characterized in that: The material of the steel ring is Q235 steel, the width of the steel ring is 20 to 30 cm, and the thickness of the steel ring is 15 to 30 mm.

6. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 1 is characterized in that: The material of the hole embedded steel ring is Q235 steel.

7. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 1 is characterized in that: The material of the grouting pipe is Q235 steel.

8. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 2 is characterized in that: The sealing brush protection plate is made of 65Mn material with a thickness of 1.0 mm.

9. The sealing device for a jacking pipe receiving tunnel in a thick and weak mud layer according to claim 2 is characterized in that: The steel wire is 0.35 martensitic stainless steel wire.

Images