Telescopic pipe structure suitable for slurry pipe ring pipe of slurry balance shield

Abstract

The utility model provides a telescopic pipe structure suitable for a slurry pipe annular pipe of a slurry balance shield. The telescopic pipe structure comprises an inner pipe and an outer pipe which are connected in a telescopic and sleeved mode, three first annular sealing pieces are arranged on the inner wall of the outer pipe, two second annular sealing pieces are arranged on the outer wall of the inner pipe, the three first annular sealing pieces form two sliding cavities in the outer pipe, one end of the inner pipe is embedded into the outer pipe, and the other end of the inner pipe is embedded into the outer pipe. The two second annular sealing pieces on the outer wall of the inner pipe are located in the two sliding cavities correspondingly, and when the inner pipe stretches out and draws back in the outer pipe, the two second annular sealing pieces move in the two sliding cavities correspondingly. A grease injection port and a gas injection port are respectively formed in the two sliding cavities; the outer pipe and the inner pipe are connected through a telescopic oil cylinder. According to the principle that a small pipe is sleeved with a large pipe, telescopic control over the pipeline is achieved, the needed space is small, the telescopic pipeline can be used for the working condition that the pipe replacement space is narrow, meanwhile, the length of the pipeline can be customized according to the space size and construction procedures, and the telescopic pipeline is relatively flexible.

Description

TECHNICAL FIELD

[0001] The utility model relates to slurry shield construction technical field, especially in a kind of telescopic pipe structure suitable for slurry balance shield slurry pipe ring pipe. BACKGROUND

[0002] With the current situation of urban rapid development, in order to meet the demand of urban accommodation rate, it is necessary to increase underground space development, and the shield construction site is smaller and smaller, and more and more split starting construction is faced.For split starting process, only shield machine main machine can be placed under working well, and the rest of the supporting structure is stored on the ground, and the form of extended pipeline is used to meet the conditions of shield forward excavation, but for slurry balance shield machine forward excavation, the soil conveying process is relatively complex, and pipeline needs to advance with shield machine, in order to ensure that slurry pipe moves normally, and does not affect shield construction, ring pipe device is arranged on the top of tail trolley, and slurry pipe changing process is carried out.

[0003] Most of the current commonly used slurry pipe changing device is long enough hose reserved on the top of trolley, which can meet the needs of forward movement of inlet and outlet slurry pipeline, and the hose changing operation is completed by moving hose changing device walking frame.The conventional slurry pipe changing device is steel wire hose, which is arranged on the operation platform by bending, and occupies a large space, so that the hose changing process cannot be normally realized in the case of limited space. SUMMARY

[0004] The utility model provides a kind of telescopic pipe structure suitable for slurry balance shield slurry pipe ring pipe according to the deficiency of prior art, which is suitable for pipeline extension in limited space, and slow extension or retraction is realized by linear motion of pipeline, to provide space for pipeline extension.

[0005] In order to achieve the above technical purpose, the utility model provides a kind of telescopic pipe structure suitable for slurry balance shield slurry pipe ring pipe, including telescopic sleeve connection inner tube and outer tube, three first annular sealing elements are arranged on the inner wall of outer tube, two second annular sealing elements are arranged on the outer wall of inner tube, the three first annular sealing elements form two sliding cavities in the inner tube, one end of the inner tube is embedded in the outer tube, and the two second annular sealing elements of the outer wall of the inner tube are located in the two sliding cavities respectively, and the two second annular sealing elements move in the two sliding cavities respectively when the inner tube is telescoped in the outer tube; grease inlet and gas inlet are arranged on the two sliding cavities respectively; the outer tube and the inner tube are connected by telescopic oil cylinder, and the telescoping between the inner tube and the outer tube is controlled by telescopic oil cylinder.

[0006] The utility model is preferably connected with the flange plate for matching connection of shield machine tail slurry pipe and station inner slurry pipe at the end of outer tube and inner tube not connected.

[0007] The utility model discloses a better technical scheme: grease injection port and gas injection port all are provided with three -way joint.

[0008] The utility model discloses a better technical scheme: first annular sealing piece and second annular sealing piece all are the sealing piece that is composed of three sealing ring pressure rings and two sealing rings, and two sealing rings are spaced apart and set up between three sealing ring pressure rings, and are fixedly pressed through three sealing ring pressure rings, be equipped with 2-3mm's gap between sealing ring pressure ring and inner tube or outer tube wall, the sealing ring adopts rubber sealing ring, and the height of sealing ring is greater than sealing ring pressure ring, and the height of sealing ring is matched with the gap between inner tube and outer tube.

[0009] The utility model discloses a better technical scheme: inner tube and outer tube all are equipped with support seat, and the top surface of support seat on inner tube and the top surface of support seat on outer tube are at the same height, and the cylinder body of telescopic oil cylinder is hinged connection with the support seat on inner tube, and its piston end is hinged connection with the support seat on outer tube.

[0010] The utility model discloses a pipeline utilizes the principle of pneumatic control to realize the relative movement between the inner tube and the outer tube of the slurry pipe, and lubricant is injected through the grease injection hole during the movement. With the forward tunneling of the shield machine, the telescopic pipe is continuously extended, and when the tunneling distance meets the pipe replacement length, the connection between the pipe replacement device and the existing slurry pipe is released, the telescopic pipe is retracted, and a new slurry pipe is added, and the forward tunneling is repeated. The device is mainly used in the shield split starting stage and is suitable for the scene where the single pipe is short, and the telescopic length is generally controlled according to 2L, and L is the segment ring width.

[0011] The utility model discloses a better technical scheme:

[0012] (1) the telescopic pipe of the utility model is connected with the rear matching structure of the shield machine and the split starting in the extension process, and the slurry pipe is separated and elongated under the action of the front and rear, and the elongation of the pipeline adopts the form of linear motion, and the space requirement is small, and the pipeline extension is more suitable for the limited space working condition.

[0013] (2) the pipeline of the utility model is designed with annular sealing structures at both ends, and there is a gas storage area between the sealing structures, and the gas can better balance the internal and external pressures, and protect the sealing from being extruded by the pressure; after the single pipeline extension is completed, the telescopic pipe is restored to the original state by the action of the gas pressure, and enters the next cycle.

[0014] (3) the pipeline sealing cavity of the utility model is provided with lubricating grease, which reduces the friction between the sealing and the pipeline, and can effectively prolong the service life of the pipeline.

[0015] The utility model discloses utilize the principle of big pipe cover small pipe realizes pipeline telescopic control, and the space required is about 1.2~1.3 times of normal operation space, and fully satisfies the requirement of limited space operation, and the length of pipeline can be customized according to the size of space and construction procedure, and it is relatively more flexible. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 And Figure 2 It is the structure schematic diagram of different angle of the utility model;

[0017] Figure 3 It is the front schematic diagram of the utility model;

[0018] Figure 4 It is Figure 3 The AA section view in;

[0019] Figure 5 It is Figure 3 The left view of;

[0020] Figure 6 It is Figure 3 The bottom view of;

[0021] Figure 7 It is Figure 6 The BB section view in;

[0022] Figure 8 It is Figure 4 The A part enlarged schematic diagram in;

[0023] Figure 9 It is the structure schematic diagram of inner tube in the utility model;

[0024] Figure 10 It is the structure schematic diagram of outer tube in the utility model;

[0025] Figure 11 It is the length direction section view of outer tube in the utility model.

[0026] In the drawing: 1 - inner tube, 2 - outer tube, 3 - first annular sealing element, 4 - second annular sealing element, 5 - a slide cavity, 6 - grease injection port, 7 - gas injection port, 8 - telescopic oil cylinder, 9 - support seat, 10 - connecting flange plate. DETAILED DESCRIPTION

[0027] The utility model will be further described below in combination with the drawings and examples. The drawings of the utility model are as follows: Figures 1 to 5All are the drawings of the embodiments, which are drawn in a simplified manner and only for the purpose of clearly and concisely illustrating the embodiments of the utility model. The technical solutions shown in the drawings below are specific schemes of the embodiments of the utility model, and are not intended to limit the scope of the claimed utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0028] In the description of the utility model, it is understood that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance.

[0029] The embodiment provides a telescopic pipe structure suitable for a slurry pipe ring pipe of a slurry balance shield, as shown in the figure, Figures 1 to 11 The outer wall of the inner pipe 1 is provided with two second annular sealing elements 4, three first annular sealing elements 3 are arranged on the inner wall of the outer pipe 2, the three first annular sealing elements 3 form two sliding cavities 5 inside the outer pipe 2, one end of the inner pipe 1 is embedded in the outer pipe 2, and the two second annular sealing elements 4 on the outer wall of the inner pipe 1 are located in the two sliding cavities 5, that is, the two second annular sealing elements 4 are located between adjacent two first annular sealing elements 3 respectively, and when the inner pipe 1 is telescoped in the outer pipe 2, the two second annular sealing elements 4 move in the two sliding cavities 5 respectively; the first annular sealing element 3 and the second annular sealing element 4 are both sealing elements composed of three sealing ring pressing rings and two sealing rings, the two sealing rings are arranged at intervals between the three sealing ring pressing rings and are fixed and pressed by the three sealing ring pressing rings; a gap of 2-3mm is arranged between the sealing ring pressing ring and the pipe wall of the inner pipe 1 or the outer pipe 2, the sealing ring is a rubber sealing ring, the height of the sealing ring is greater than that of the sealing ring pressing ring, and the height of the sealing ring matches the gap between the inner pipe 1 and the outer pipe 2. The material of the sealing ring is selected to be flexible rubber with high wear resistance, the sealing ring and the pipeline are compressed and sealed, and the cavity formed by the sealing ring is pressurized by using air pressure, so that the carrying capacity of the pipeline is improved.

[0030] The embodiment provides a telescopic pipe structure suitable for a slurry pipe ring pipe of a slurry balance shield, as shown in the figure, Figures 1 to 11As shown in the drawings, the two sliding cavities 5 are respectively provided with a grease injection port 6 and a gas injection port 7; in order to reduce the influence of friction on sealing during the extension and retraction of the pipeline, grease can be injected into the sliding cavity 5 (i.e. the extension range of the inner tube) through the grease injection port 6 to reduce resistance, and generally one injection can last for a period of time, and does not need to be injected for a long time; at the same time, the gas injection port 7 is used to realize the pressure adjustment during the extension and retraction of the pipeline, so as to avoid the phenomenon that the negative pressure cannot be released, the gas is supplemented in time, and the pressure in the sliding cavity can always be kept stable. If the pressure is too large, it can be relieved, and if the pressure is too small, the gas can be supplemented to increase the pressure. The grease injection port 6 and the gas injection port 7 are both provided with a three-way interface, and the three-way interface at the grease injection port 6 is mainly used to ensure that the grease is injected at one end, and the excess grease can be leaked from the other end. The three-way interface at the gas injection port 7 is used to input gas at one end and connect a pressure relief valve at the other end, so that when the gas pressure exceeds the set value, the pressure relief valve can automatically relieve pressure, so that the pressure in the cavity is balanced and stable, and the mud in the pipeline is prevented from entering the sliding cavity.

[0031] The embodiment provides a telescopic pipe structure suitable for a slurry balance shield slurry pipe ring pipe, as shown in the drawings, Figures 1 to 11 As shown in the drawings, the outer pipe 2 and the inner pipe 1 are connected through a telescopic oil cylinder 8, and the telescopic oil cylinder 8 is used to control the extension and retraction between the inner pipe 1 and the outer pipe 2. The inner pipe 1 and the outer pipe 2 are both provided with a support seat 9, and the top surface of the support seat on the inner pipe 1 is at the same height as the top surface of the support seat on the outer pipe 2. The cylinder body of the telescopic oil cylinder 8 is hingedly connected with the support seat 9 on the inner pipe 2, and the piston end is hingedly connected with the support seat on the outer pipe 2. During the extension and retraction of the pipeline, the telescopic oil cylinder 8 is used to drive the pipeline to reciprocate, and the injected and extracted air is used to push the pipeline to extend and retract through a pneumatic control hole.

[0032] In the embodiment, as shown in the drawings, Figures 1 to 4 As shown in the drawings, the end portions of the outer pipe 2 and the inner pipe 1 which are not sleeved are respectively provided with a connecting flange plate 10 used for matching connection with a slurry pipe at the tail of a shield machine and a slurry pipe in a station; the telescopic slurry pipe changing device can be conveniently connected with the slurry pipe at the tail of the shield machine and the slurry pipe in the station to transport slurry.

[0033] The utility model discloses a linear telescopic structure, and the installation occupies small space, in the shield construction process, through the telescopic pipe, the tail mud pipe of shield machine is connected with the mud pipe in the station, in the shield machine advancing process, through telescopic oil cylinder 8 control inner tube and outer tube stretch, satisfy the mud delivery in the shield driving process, when the driving distance satisfies the pipe length, the tail mud pipe of shield machine and the mud pipe in the station all close mud delivery through stop valve, remove the connection between pipe changing device and existing mud pipe, and the pipe changing structure is dismantled, and is retrieved to the original position, and the telescopic pipe changing device is installed again after the extension pipeline is added to the tail of shield machine, and the forward driving is repeated. The mud pipe length is set about 6m, and the telescopic length is controlled about 4m, and it is generally the integer multiple of segment ring width, and it is convenient for construction. The device is mainly used for the shield split body starting stage, and is suitable for the scene that single pipe is short, and generally telescopic length is controlled according to 2L, and L is segment ring width.

[0034] The above is only one embodiment of the utility model, and the description is more specific and detailed, but it can not be understood as the limitation of the scope of the utility model. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the appended claims.

Claims

1. A telescopic pipe structure suitable for a slurry pipe ring pipe of a slurry shield, characterized by: The invention comprises an inner tube (1) and an outer tube (2) which are telescopically connected. The inner wall of the outer tube (2) is provided with three first annular seals (3), and the outer wall of the inner tube (1) is provided with two second annular seals (4). The three first annular seals (3) form two sliding cavities (5) inside the outer tube (2). One end of the inner tube (1) is embedded in the outer tube (2), and the two second annular seals (4) on the outer wall of the inner tube (1) are respectively located in the two sliding cavities (5). When the inner tube (1) is telescopically connected in the outer tube (2), the two second annular seals (4) move in the two sliding cavities (5). A grease injection port (6) and a gas injection port (7) are respectively provided on the two sliding cavities (5). The outer tube (2) and the inner tube (1) are connected by a telescopic oil cylinder (8), and the telescopic oil cylinder (8) controls the telescopic movement between the inner tube (1) and the outer tube (2).

2. The telescopic pipe structure suitable for the slurry pipe ring pipe of a slurry shield according to claim 1, characterized in that: The ends of the outer pipe (2) and the inner pipe (1) that are not sleeved are respectively provided with connecting flanges (10) for matching and connecting with the mud pipe at the tail of the shield machine and the mud pipe in the station.

3. A telescopic pipe structure suitable for a slurry pipe ring pipe of a slurry shield according to claim 1 or 2, characterized in that: The grease injection port (6) and the gas injection port (7) are both provided with three-way interfaces.

4. The telescopic pipe structure suitable for a slurry pipe ring pipe of a slurry shield according to claim 1 or 2, characterized in that: The first annular seal (3) and the second annular seal (4) are both seals consisting of three sealing rings and two sealing rings, the two sealing rings being arranged at intervals between the three sealing rings and being fixed and compressed by the three sealing rings; a gap of 2 to 3 mm is provided between the sealing rings and the wall of the inner tube (1) or the outer tube (2); the sealing ring is a rubber sealing ring, the height of the sealing ring is greater than the sealing ring, and the height of the sealing ring matches the gap between the inner tube (1) and the outer tube (2).

5. The telescopic pipe structure suitable for the slurry pipe ring pipe of a slurry shield according to claim 1 or 2, characterized in that: A support seat (9) is provided on both the inner tube (1) and the outer tube (2), and the top surface of the support seat on the inner tube (1) and the top surface of the support seat on the outer tube (2) are at the same height. The cylinder body of the telescopic oil cylinder (8) is hingedly connected to the support seat (9) on the inner tube (1), and the piston end thereof is hingedly connected to the support seat on the outer tube (2).

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