WO2018188531A1 - 泥水盾构盾尾刷更换液氮冻结安全保护装置及方法 - Google Patents
泥水盾构盾尾刷更换液氮冻结安全保护装置及方法 Download PDFInfo
- Publication number
- WO2018188531A1 WO2018188531A1 PCT/CN2018/082171 CN2018082171W WO2018188531A1 WO 2018188531 A1 WO2018188531 A1 WO 2018188531A1 CN 2018082171 W CN2018082171 W CN 2018082171W WO 2018188531 A1 WO2018188531 A1 WO 2018188531A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid nitrogen
- shield
- shield tail
- freezing
- liquid
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0635—Tail sealing means, e.g. used as end shuttering
Definitions
- the invention relates to the field of shield machines, and more particularly to a liquid water shield shield tail brush replacement liquid nitrogen freezing safety protection device and method.
- the shield tail wire brush is an important part of the shield machine sealing system.
- the shield tail brush In the construction of large diameter mud-water balance shield, the shield tail brush is used and a certain amount of filler (shield grease) is injected, which can be used in the shield machine and A good sealing system is formed between the segments, which can effectively prevent groundwater, mud and synchronous grouting slurry from flowing into the shield machine, and ensure that the tunneling can be carried out safely and smoothly.
- the shield tail brush is over-extruded by the eccentric tube piece to cause plastic deformation to lose the elasticity, or the long-distance tunneling causes the shield tail brush to wear seriously, which directly causes the shield tail seal system to fail. This causes impurities such as synchronous grouting slurry to flow into the shield machine, endangering the safety of construction workers and construction equipment. Therefore, it is necessary to replace the failed shield tail brush in time after the shield tail brush fails.
- the shield tail seal device of the shield machine with the application number 201210068168.1 adds a sealing brush and a sealing plate to the conventional sealing device, but the present invention is directed to the shield tail seal during the normal tunneling process, if a shield appears The tail leaks and cannot be effectively dealt with; on the other hand, although the sealing plate is added to the present invention, there is a problem that the sealing plate and the segment have a poor adhesion, and the anti-seepage effect is affected to some extent;
- the shield tail emergency seal device and its installation structure for the shield machine of the application number 201220102998.2 the patent has two problems: on the one hand, the inflatable rubber tube used in the patent is long-term in the shield tail grease, after a long time After the time, the problem of aging of the rubber tube will inevitably occur. Once aging, it is likely to affect the airtightness of the emergency seal and affect the sealing effect; on the other hand, the patent uses an inflatable rubber tube for emergency sealing. There is a problem that the bonding between the rubber and the tube sheet is not dense and water seepage.
- the object of the present invention is to provide a mud water shield shield tail brush replacement liquid nitrogen freezing safety protection device in view of the deficiencies in the prior art.
- a mud water shield shield tail brush replaces a liquid nitrogen freezing safety protection device, comprising a shield tail shell, a shield tail brush and a tube piece disposed from the outside, wherein the shield tail shell is provided with a mortar tube, the safety The protection device further includes at least one set of liquid nitrogen freezing devices disposed inside the shield tail casing between adjacent mortar tubes, the liquid nitrogen freezing device including the inlet pipe, the outlet pipe and the circumferential direction One end of the freezing tube, the inlet tube and the outlet tube are respectively connected with a stainless steel hose and a low temperature liquid nitrogen valve, and a circumferential freezing tube is connected between the other end of the inlet tube and the outlet tube.
- the low temperature liquid nitrogen valve and the stainless steel hose are disposed between the main frame of the shield machine and the shield tail housing.
- the rear end of the shield tail housing is provided with an elastic sealing plate, and the annular freezing tube is disposed on a side of the shield tail housing adjacent to the elastic sealing plate.
- the extending direction of the inlet pipe and the outlet pipe is the same as the direction of the tunneling of the shield machine, and the direction of the circumferential direction of the freezing pipe is perpendicular to the direction of the tunneling of the shield machine.
- the above liquid nitrogen freezing device is provided with six groups.
- a method for protecting a liquid nitrogen freezing safety of a mud shield shield tail brush comprising the following steps:
- the liquid nitrogen inlet pressure in the above step 2 is 0.05-0.15 MPa, and the final temperature is: minus 15-20 °C.
- the liquid nitrogen inlet pressure in the above step 4 is 0.05-0.10 MPa.
- the working principle is: when the replacement shield tail brush is replaced, the liquid nitrogen is injected through the liquid inlet pipe reserved at the middle shield position (the main frame of the shield machine and the shield tail shell), and the liquid nitrogen is taken from the liquid inlet pipe. Enter the shield tail ring to the freezing pipe, and the liquid nitrogen exchanges heat with the body to be frozen (groundwater, soil and wall after the grouting slurry and other materials in the vicinity of the shield tail) through the ring-shaped freezing pipe, and then carries out heat exchange. Quickly freeze, form an effective frozen sealing body, avoid the leakage of the shield tail and the leakage of the slurry during the replacement process of the shield tail brush, and ensure the safety of the construction personnel and the shield machine equipment.
- the invention has the beneficial effects that the invention avoids the risk of drilling holes on the segment and the damage caused to the structure of the segment, but adds a ring to the liquid nitrogen freezing pipe after the tail of the shield, and pre-position with the middle shield
- the liquid inlet pipe and the liquid outlet pipe form a liquid nitrogen circulation passage, and the liquid nitrogen circulating in the channel can quickly freeze the shield tail soil to prevent mud, water and other impurities from entering the shield machine, and the device is easy to operate and quickly freezes. It can effectively guarantee the safety of personnel and equipment during the replacement process of the shield tail brush.
- Figure 1 is a schematic diagram of a liquid nitrogen cooling circuit
- Figure 2 is an enlarged view of A in Figure 1;
- Figure 3 is a cooling seal system layout
- spatially relative terms such as “above”, “above”, “on top”, “above”, etc., may be used herein to describe as in the drawings.
- the exemplary term “above” can include both “over” and "under”.
- the device can also be positioned in other different ways (rotated 90 degrees or at other orientations) and the corresponding description of the space used herein is interpreted accordingly.
- a mud-water shield shield tail brush replacement liquid nitrogen freezing safety protection device including a shield tail shell 1 and a shield tail brush which are disposed from the outside. 2 and the tube piece 3, the shield tail housing 1 is provided with a mortar tube 4, the safety protection device further comprises at least one set of liquid nitrogen freezing device, and the liquid nitrogen freezing device is disposed in the adjacent mortar tube 4
- the liquid nitrogen freezing device comprises an inlet pipe 5, an outlet pipe 6 and a circumferential freezing pipe 7, and one end of the inlet pipe 5 and the outlet pipe 6 are respectively connected with a stainless steel hose 8
- a low temperature liquid nitrogen valve 9 the low temperature liquid nitrogen valve 8 and the stainless steel hose 9 are disposed between the shield machine main body casing 11 and the shield tail casing 1, the liquid inlet pipe 5 and the liquid discharge pipe 6
- a circumferential freezing tube 7 is connected between the other ends.
- the rear end of the shield tail housing 1 is provided with an elastic sealing plate 10, and the annular freezing tube 7 is disposed on a side of the shield tail housing adjacent to the elastic sealing 10 plate, and the liquid inlet tube 5 and the liquid outlet tube 6 are provided.
- the direction of extension is the same as the direction of the tunneling of the shield machine, and the direction in which the ring extends toward the freezing tube 7 is perpendicular to the direction in which the shield machine is driven.
- the mud shield shield tail brush replacement liquid nitrogen freezing safety protection device can be carried out under high water pressure conditions, that is, according to another embodiment of the present application, a mud water shield shield tail brush replacement liquid under high water pressure condition is provided.
- Nitrogen freezing safety protection method including the following steps:
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
Claims (8)
- 一种泥水盾构盾尾刷更换液氮冻结安全保护装置,包括由外而内设置的盾尾壳体、盾尾刷和管片,所述盾尾壳体内设有砂浆管,其特征在于:所述安全保护装置还包括至少一组液氮冻结装置,所述液氮冻结装置设置在相邻砂浆管之间的盾尾壳体内部,所述液氮冻结装置包括进液管、出液管和环向冻结管,进液管和出液管的一端分别连接有不锈钢软管和低温液氮阀门,所述进液管和出液管的另一端之间连接有环向冻结管。
- 根据权利要求1所述的一种泥水盾构盾尾刷更换液氮冻结安全保护装置,其特征在于:所述低温液氮阀门和不锈钢软管设置在盾构机主机壳体与盾尾壳体之间。
- 根据权利要求1或2所述的一种泥水盾构盾尾刷更换液氮冻结安全保护装置,其特征在于:所述盾尾壳体尾部设有弹性密封板,所述环向冻结管设置在盾尾壳体内部靠近弹性密封板的一侧。
- 根据权利要求1或2所述的一种泥水盾构盾尾刷更换液氮冻结安全保护装置,其特征在于:所述进液管和出液管的延伸方向与盾构机的掘进方向相同,所述环向冻结管的延伸方向与盾构机的掘进方向垂直。
- 根据权利要求1或2所述的一种泥水盾构盾尾刷更换液氮冻结安全保护装置,其特征在于:所述液氮冻结装置设有6组。
- 根据权利要求1所述的一种泥水盾构盾尾刷更换液氮冻结安全保护方法:包括如下步骤:步骤1:盾构机停机,停止工作并检查盾尾渗漏点位;步骤2:进液管和出液管的不锈钢软管与液氮系统连接,通入液氮,并进行测温;步骤3:持续通入液氮冻结并进行温度监测检测渗漏点的渗漏情况;步骤4:待渗漏情况消除后,持续通入液氮维护冻结;步骤5:进行渗漏部位的盾尾刷拆除更换等的方案实施;步骤6:更换完成后拆除盾构机内的临时冻结系统;步骤7:冻结部位解冻;步骤8:盾构机恢复推进。
- 根据权利要求6所述的一种泥水盾构盾尾刷更换液氮冻结安全保护方法,其特征在于:所述步骤2中液氮通入压力为0.05-0.15MPa,最终温度为:零下15-20℃。
- 根据权利要求6所述的一种泥水盾构盾尾刷更换液氮冻结安全保护方法,其特征在于:所述步骤4中液氮通入压力为0.05-0.1MPa。
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CN201710229498.2 | 2017-04-10 | ||
CN201710229498.2A CN106988752A (zh) | 2017-04-10 | 2017-04-10 | 一种高水压条件下泥水盾构盾尾刷更换液氮冻结安全保护装置及方法 |
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Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106988752A (zh) * | 2017-04-10 | 2017-07-28 | 中铁十四局集团有限公司 | 一种高水压条件下泥水盾构盾尾刷更换液氮冻结安全保护装置及方法 |
CN108240225A (zh) * | 2018-02-11 | 2018-07-03 | 南京林业大学 | 盾构机尾部的冻结系统及盾尾刷更换方法 |
CN108979649B (zh) * | 2018-09-07 | 2020-03-17 | 中铁十二局集团有限公司 | 盾构机盾尾应急冻结系统及方法 |
CN109751474A (zh) * | 2019-01-29 | 2019-05-14 | 中国铁建重工集团有限公司 | 一种用于泥水平衡盾构机管路延伸系统的换管装置 |
CN110159281A (zh) * | 2019-06-17 | 2019-08-23 | 廊坊辰兴机械有限公司 | 一种带冷冻功能的盾尾刷及盾尾定位冻结系统 |
CN110424972A (zh) * | 2019-07-19 | 2019-11-08 | 广东华隧建设集团股份有限公司 | 一种泥水盾构盾尾刷更换液氮冻结安全保护装置 |
CN113756823A (zh) * | 2020-06-01 | 2021-12-07 | 宏润建设集团股份有限公司 | 盾构机内的间接环形冻结装置、其安装方法及冻结系统 |
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