Shield receiving tunnel portal sealing device

Abstract

The utility model discloses a shield receiving tunnel portal sealing device, which belongs to the technical field of shield receiving tunnel portal sealing, and comprises a sealing steel ring, one end of the sealing steel ring is fixed on a lining wall, the other end of the sealing steel ring is provided with a first sealing mechanism, the bottom end of the sealing steel ring is provided with a second sealing mechanism, and the second sealing mechanism comprises an elastic rubber strip, the elastic rubber strip is fixed to the bottom end of the sealing steel ring through a bolt, a rubber bag is installed between the elastic rubber strip and the sealing steel ring, and a grouting pipe is embedded above the rubber bag and communicated with the rubber bag. According to the shield sealing device, the pressure bearing capacity of sealing is greatly improved in the mode that the traditional sealing rubber curtain cloth is combined with the rubber bag, grouting pressure and water and soil pressure which are more than 10 bar can be resisted, and therefore the convenience of arrangement of the shield sealing device and the reliability of the sealing effect are improved, and the service life of the shield sealing device is prolonged. And meanwhile, the follow-up plugging measure cost and the delayed construction period caused by a poor traditional sealing mode can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield receiving tunnel door sealing, in particular to a shield receiving tunnel door sealing device. Background Art

[0002] In today's urban subway transportation construction, the shield method is widely used because of its fast construction and small impact on the ground. The shield is relatively safe during normal excavation, and its risk points are mainly concentrated in the shield's starting and arrival reception stages. The shield arrival is a series of operations in which the shield completes the construction of a certain section of the tunnel in the stratum, while maintaining the stability of the surrounding soil, and advances along the designed route to the through-face of the receiving well, and then introduces the shield into the receiving well from the pre-prepared hole. However, under high-water-rich and complex geological conditions, if the quality of the end reinforcement is not good, it is very easy to cause water and sand gushing from the tunnel gate, which directly affects the normal arrival and reception of the shield. At present, in China, if cement-based end reinforcement cannot be carried out due to geological conditions or ground conditions, the horizontal freezing reinforcement method is often used. However, due to the length limit of the reinforcement body and the excessive abundance of groundwater, there is still a great risk of the arrival and reception of the shield. In order to solve the problem of water gushing when the shield arrives at the tunnel gate, the sealing treatment of the tunnel gate is an indispensable link in the shield construction, which plays a vital role in whether the shield can be received smoothly.

[0003] Common shield receiving sealing devices include rubber curtain with folding plate, shield receiving in steel sleeve, as well as uncommon construction methods such as underwater receiving and freezing receiving. Among them, the rubber curtain with folding plate is widely used, but the sealing effect is often poor, resulting in leakage of the tunnel door during shield receiving, and eventually leading to collapse; the receiving method in steel sleeve can be effectively used to receive shield machines in water-rich strata, but there are defects such as large investment in labor, materials, and machinery, and prolonged working time for shield dismantling. Utility Model Content

[0004] The utility model aims to provide a shield receiving tunnel door sealing device to solve the deficiencies in the prior art.

[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is:

[0006] A shield receiving tunnel door sealing device comprises: a sealing steel ring, one end of which is fixed to an inner lining wall, and the other end is provided with a first sealing mechanism, the bottom end of the sealing steel ring is provided with a second sealing mechanism, and the second sealing mechanism comprises: an elastic rubber strip, the elastic rubber strip is fixed to the bottom end of the sealing steel ring by bolts, a rubber bladder is installed between the elastic rubber strip and the sealing steel ring, a grouting pipe is pre-buried above the rubber bladder, and the grouting pipe is connected to the rubber bladder.

[0007] Preferably, the first sealing mechanism comprises: a rubber curtain, which is fixed to the end of the sealing steel ring away from the lining wall through a plurality of folding pressure plates, and the folding pressure plate comprises: a fixing plate, which fixes the rubber curtain to the sealing steel ring through bolts, and the bottom end of the fixing plate is rotatably connected to a movable plate, and a wire rope fixing ring is arranged on the movable plate, and a wire rope is passed through the wire rope fixing ring.

[0008] Preferably, the steel wire rope connects a plurality of folding pressure plates in series into a ring via a steel wire rope fixing ring, and both ends of the steel wire rope are connected to an external hand winch.

[0009] Preferably, a steel plate is pre-embedded in the lining wall, and the sealing steel ring is fixed to the steel plate by bolts.

[0010] The shield receiving tunnel door sealing device provided by the utility model has the following advantages compared with the prior art:

[0011] The utility model greatly improves the pressure-bearing capacity of the seal by combining the traditional sealing rubber curtain with the rubber bladder bag, and can resist the grouting pressure and water and soil pressure above 10 bar, thereby improving the convenience of the layout of the shield sealing device and the reliability of the sealing effect, and at the same time can avoid the subsequent sealing measures costs and delayed construction period caused by the poor traditional sealing methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0013] Figure 1 It is a schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the utility model in use.

[0015] In the figure: 1- lining wall, 2- sealing steel ring, 3- grouting pipe, 4- folding pressure plate, 5- rubber curtain cloth, 6- steel wire rope, 7- elastic rubber strip, 8- rubber bag, 9- steel plate, 10- tunnel lining segment, 11- backfill grouting filling. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0017] refer to Figure 1-2As shown, the utility model provides a shield receiving tunnel sealing device, comprising: a sealing steel ring 2, one end of the sealing steel ring 2 is fixed on the inner lining wall 1, and the other end is provided with a first sealing mechanism, and the bottom end of the sealing steel ring 2 is provided with a second sealing mechanism, and the second sealing mechanism comprises: an elastic rubber strip 7, the elastic rubber strip 7 is fixed to the bottom end of the sealing steel ring 2 by bolts, a rubber bag 8 is installed between the elastic rubber strip 7 and the sealing steel ring 2, and a grouting pipe 3 is pre-buried above the rubber bag 8, and the grouting pipe 3 is connected with the rubber bag 8. The first sealing mechanism comprises: a rubber curtain 5, the rubber curtain 5 is fixed to the end of the sealing steel ring 2 away from the inner lining wall 1 through a plurality of folding pressure plates 4, and the folding pressure plate 4 comprises: a fixed plate, the fixed plate fixes the rubber curtain 5 to the sealing steel ring 2 by bolts, and the bottom end of the fixed plate is rotatably connected with a movable plate, and a wire rope fixing ring is provided on the movable plate, and a wire rope 6 is passed through the wire rope fixing ring. The steel wire rope 6 connects a plurality of folding plates 4 in series into a ring through a steel wire rope fixing ring, and both ends of the steel wire rope 6 are connected to an external hand chain hoist. A steel plate 9 is pre-embedded in the inner lining wall 1, and the sealing steel ring 2 is fixed to the steel plate 9 by bolts.

[0018] The working process and principle of the utility model are:

[0019] Step 1: During the construction of the lining wall 1 structure, the steel plate 9 is pre-buried in the lining wall 1 structure;

[0020] Step 2: Before the shield machine arrives, install the sealing steel ring 2 on the steel plate 9, then install the unfilled rubber bag 8, fix it with the elastic rubber strip 7, and finally install the rubber curtain 5, fix it with the folding plate 4, and install the steel wire rope 6 in the steel wire rope fixing ring to facilitate the restraint of the folding plate 4 during the reception of the shield machine;

[0021] Step 3: After the shield machine arrives, the wire rope 6 is tightened by the hand winch to provide pressure on the folding plate 4, so that the rubber curtain 5 is closely attached to the shield machine shell, and as the shield machine moves forward, the wire rope 6 is tensioned multiple times. As the shield machine moves forward, if the rubber curtain 5 cannot achieve a sealing effect, low-strength slurry can be injected into the unfilled rubber bladder 8 through the reserved grouting pipe 3 to make it closely attached to the shield machine shell to achieve a further sealing effect;

[0022] Step 4: When the tail end of the shield machine is separated from the rubber bag 8, low-strength slurry is injected into the rubber bag 8 through the reserved grouting pipe 3 again, so that it expands again until it is closely attached to the outside of the tunnel lining segment 10;

[0023] Step 5: In step 3 and step 4, when the shield machine moves forward, the filled rubber bag 8 is restrained by the elastic rubber strip 7 and the clamping plate in the sealing steel ring 2 so that it does not shift, thereby achieving a good sealing effect;

[0024] Step 6: After step 4 is completed, the gap between the tunnel lining segment 10 and the inner lining wall 1 is filled with backfill grouting 11, and cement-water glass mixed slurry is injected to make the slurry solidify quickly to achieve a sealing effect. Then, the shield machine can continue to move forward until the shield machine receiving work is completed.

[0025] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0026] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0027] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A shield receiving tunnel door sealing device, characterized in that: include: A sealing steel ring (2), one end of the sealing steel ring (2) is fixed on the inner lining wall (1), and the other end is provided with a first sealing mechanism, and the bottom end of the sealing steel ring (2) is provided with a second sealing mechanism, and the second sealing mechanism comprises: an elastic rubber strip (7), the elastic rubber strip (7) is fixed to the bottom end of the sealing steel ring (2) by bolts, a rubber bag (8) is installed between the elastic rubber strip (7) and the sealing steel ring (2), a grouting pipe (3) is pre-buried above the rubber bag (8), and the grouting pipe (3) is connected to the rubber bag (8).

2. A shield receiving tunnel door sealing device according to claim 1, characterized in that: The first sealing mechanism comprises: a rubber curtain (5), the rubber curtain (5) being fixed to one end of the sealing steel ring (2) away from the lining wall (1) via a plurality of folding pressure plates (4), the folding pressure plate (4) comprising: a fixing plate, the fixing plate fixing the rubber curtain (5) to the sealing steel ring (2) via bolts, the bottom end of the fixing plate being rotatably connected to a movable plate, the movable plate being provided with a wire rope fixing ring, a wire rope (6) being passed through the wire rope fixing ring.

3. A shield receiving tunnel door sealing device according to claim 2, characterized in that: The steel wire rope (6) connects a plurality of folding plates (4) in series into a ring via a steel wire rope fixing ring, and both ends of the steel wire rope (6) are connected to an external hand chain hoist.

4. A shield receiving tunnel door sealing device according to claim 1, characterized in that: A steel plate (9) is pre-buried in the inner lining wall (1), and the sealing steel ring (2) is fixed to the steel plate (9) by means of bolts.

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