CN-122014269-A - Shield tail brush with high bearing pressure

Abstract

The utility model provides a shield tail brush of high pressure-bearing, includes the base steel sheet layer of installing in the multichannel of shield tail, all is fixed with on every base steel sheet layer can with the seal structure layer of section of jurisdiction terminal surface butt, forms annular grease chamber at the hoop between the adjacent seal structure layer, still is fixed with on every base steel sheet layer can with the reinforcing pressurize layer of section of jurisdiction terminal surface butt, the reinforcing pressurize layer on the same base steel sheet layer sets up with seal structure layer interval, makes the annular grease chamber between the adjacent seal structure layer is divided into first grease chamber and reinforcing grease chamber by reinforcing pressurize layer. According to the shield tail brush, independent grease enhancing cavities can be formed between adjacent shield tail brushes, so that the number of the original shield tail sealing cavities is doubled, the shield tail sealing performance is effectively improved, no extra space is occupied after improvement, and the installation and replacement cost is low.

Inventors

• YUAN PENGFEI
• JING QICHENG
• LIU PEILIANG
• XU KUN
• WANG CHUNXIAO
• ZHANG JIAXING
• PENG XIAO
• ZHANG XINYU
• DUAN YONGJI
• LI JIAFENG
• CHEN SHAOHUA
• Peng Huaiyang
• JIAO SHUAISHUAI
• ZHANG ZHIQIANG
• ZHOU YUANHANG
• ZHOU MENGJIA
• LI YANAN
• PENG FAN
• ZHANG HONGDA
• SUN HAIBO

Assignees

• 中铁隧道局集团有限公司
• 中铁隧道局集团有限公司设备分公司

Dates

Publication Date

20260512

Application Date

20260413

Claims (10)

1. 1. A shield tail brush with high bearing pressure comprises a plurality of base steel plate layers (3) arranged on a shield tail (1), wherein sealing structure layers capable of being abutted against the end faces of duct pieces (2) are fixed on each base steel plate layer (3), and annular grease cavities are formed between adjacent sealing structure layers in the circumferential direction.
2. 2. The shield tail brush with high bearing pressure according to claim 1, wherein each sealing structure layer is formed by annular arrangement of at least two sealing structures, one end of each sealing structure is fixedly connected with the base steel plate layer (3), and the other end of each sealing structure is tilted and can be abutted against the end face of the duct piece (2); Each sealing structure comprises a protection plate (4), a pressing plate (5) and a steel wire package assembly arranged between the protection plate (4) and the pressing plate (5), wherein the protection plate (4) is arranged on one side facing the duct piece (2).
3. 3. The shield tail brush with high bearing pressure according to claim 2 is characterized in that the reinforcing pressure maintaining layer is formed by annularly arranging pressure maintaining plates (6), one ends of the pressure maintaining plates (6) are fixed with a base steel plate layer (3), the other ends of the pressure maintaining plates are tilted and can be abutted against the end faces of duct pieces (2), a first grease cavity is arranged between the pressure maintaining plates (6) and an adjacent sealing structure layer, and the reinforcing grease cavity is arranged between the protecting plate (4) and the pressure maintaining plates (6).
4. 4. A highly loaded shield tail brush according to claim 3, characterized in that adjacent pressure-retaining plates (6) of the same reinforcing pressure-retaining layer are arranged in a staggered manner.
5. 5. The shield tail brush with high bearing pressure according to claim 2 is characterized in that the tilting direction of the pressure maintaining plate (6) is the same as that of the protecting plate (4).
6. 6. A highly loaded shield tail brush according to claim 1, characterized in that the base steel plate layer (3) is provided with a fixed mounting part (301), and one end of each sealing structure is fixed in the fixed mounting part (301).
7. 7. A highly loaded shield tail brush according to claim 2, characterized in that the length of the wire package assembly is greater than the length of the protection plate (4).
8. 8. The high-pressure-bearing shield tail brush according to claim 2, wherein the steel wire package assembly comprises at least two layers of steel wire packages (7), and a screen (8) is arranged between every two adjacent steel wire packages (7).
9. 9. A highly loaded shield tail brush according to claim 2, characterized in that the end of the wire package assembly remote from the base steel plate layer (3) is stepped.
10. 10. The shield tail brush with high bearing pressure according to claim 1 is characterized in that one end of a pressure maintaining plate (6) is fixedly connected with a base steel plate layer (3) through a connecting piece; each connecting piece comprises a locating pin (9) and a pressing plate (10) with a pin hole, wherein the locating pin (9) is fixed on the base steel plate layer (3), the end part of the locating pin (9) penetrates through the pin hole and is welded with the pressing plate (10), and the end part of the pressure maintaining plate (6) is pressed and fixed between the pressing plate (10) and the base steel plate layer (3).

Description

Shield tail brush with high bearing pressure Technical Field The invention relates to the technical field of shield machines, in particular to a high-pressure-bearing shield tail brush. Background In the construction of the shield method, a shield tail brush is arranged in an annular gap between a shield shell at the tail part of the shield machine and the outer cambered surface of the duct piece, and is the last defense line for blocking underground water, synchronous grouting liquid and soil sand boil from entering a tunnel, and the reliability of the sealing performance directly determines the construction safety. Currently, shield construction is deeply developed in the direction of 'four supers', namely ultra-large diameter, ultra-long distance, ultra-large burial depth and ultra-high water pressure, which provides unprecedented severe requirements for the sealing performance of a shield tail brush, particularly ultra-high water pressure working conditions, the penetration pressure of a river crossing and sea crossing tunnel can reach more than 0.9MPa, once the shield tail brush is subjected to sealing failure caused by abrasion, fatigue or local falling, high-speed high-pressure water flow is instantaneously gushed in, catastrophic water gushing sand is extremely easy to induce, the machine is stopped for maintenance, the earth surface collapse is seriously caused, the building (structure) is damaged, and even the whole tunnel collapses. As shown in fig. 1 and 2, the conventional shield tail brush mainly comprises a base steel plate layer 3, a protection plate 4, a steel wire package 7, a compacting plate 5 and the like. Wherein the protection board is tightly attached to the duct piece 2, and plays a role in sealing together with the steel wire package and the shield tail grease. The shield tail brushes are spliced and welded into rings along the radial direction of the shield tail 1, shield tail grease is injected between the two rings to form a sealing cavity, the sealing effect of the shield tail is achieved, and underground water, synchronous grouting liquid and soil sand boil are blocked from entering a tunnel. The capacity of shield tail seal is related to the number of layers of shield tail brush, and after the number of layers of shield tail brush increases, corresponding sealing capacity can be promoted, but the shield tail brush occupation space of too many layers is great, and later replacement cost is high simultaneously. In face of the challenge of superposition of 'four-super' extreme compound working conditions, the existing shield tail brush design is difficult to meet the safety redundancy requirement of 'high bearing', and development of a novel shield tail brush with high sealing performance, which can adapt to the resistance to ultra-high pressure, is needed to be developed, so that reliable guarantee is provided for tunnel safety construction in extreme environments. Disclosure of Invention The invention aims to provide a high-pressure-bearing shield tail brush, which can form independent grease enhancing cavities between adjacent shield tail brushes, double the number of the original shield tail sealing cavities, effectively improve the shield tail sealing performance, and has the advantages of no occupation of extra space after improvement and low installation and replacement cost. The technical scheme includes that the shield tail brush comprises a plurality of base steel plate layers arranged on the shield tail, sealing structure layers capable of being abutted against the end faces of the duct pieces are fixed on each base steel plate layer, annular grease cavities are formed between adjacent sealing structure layers in the circumferential direction, reinforcing pressure maintaining layers capable of being abutted against the end faces of the duct pieces are also fixed on each base steel plate layer, and the reinforcing pressure maintaining layers and the sealing structure layers on the same base steel plate layer are arranged at intervals, so that the annular grease cavities between the adjacent sealing structure layers are divided into first grease cavities and reinforcing grease cavities by the reinforcing pressure maintaining layers. As a preferable scheme, each sealing structure layer is formed by annular arrangement of at least two sealing structures, one end of each sealing structure is fixedly connected with the base steel plate layer, and the other end of each sealing structure is tilted and can be abutted with the end face of the duct piece; Each sealing structure comprises a protecting plate, a pressing plate and a steel wire package assembly arranged between the protecting plate and the pressing plate, wherein the protecting plate is arranged on one side facing the duct piece. The reinforced pressure maintaining layer is formed by annular arrangement of pressure maintaining plates, one ends of the pressure maintaining plates are fixed with the base steel plate la