CN210977478U - Novel freezing reinforcing structure for initial end of tunnel shield - Google Patents
Novel freezing reinforcing structure for initial end of tunnel shield Download PDFInfo
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- CN210977478U CN210977478U CN201921436813.XU CN201921436813U CN210977478U CN 210977478 U CN210977478 U CN 210977478U CN 201921436813 U CN201921436813 U CN 201921436813U CN 210977478 U CN210977478 U CN 210977478U
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Abstract
The utility model provides a novel freezing and reinforcing structure of a tunnel shield initiating terminal, which comprises a tunnel region, a first freezing wall and a second freezing wall, wherein the first freezing wall is positioned outside the tunnel region, and a first freezing pipe is arranged in the first freezing wall; the second freezing wall is positioned on the outer side of the first freezing wall, a second freezing pipe is arranged in the second freezing wall, and the hardness of the first freezing wall is higher than that of the second freezing wall. The utility model provides a novel freezing reinforced structure of tunnel shield initiating terminal sets up two layers of freezing walls with different hardness outside the tunnel region, thus obtaining two beneficial effects, one of which, the tunnel region itself does not set up freezing pipe, which is convenient for shield tunneling construction; and secondly, the two-layer frozen wall with clear layer hardness is safe and reliable, and the cost is saved.
Description
Technical Field
The utility model relates to a civil construction technique, concretely relates to novel reinforced structure that freezes of tunnel shield originating terminal.
Background
In the shield tunnel construction, the soil reinforcing technology of the shield initiating terminal is an important component in the shield in-out construction technology, and the well-known vertical freezing method is a common soil reinforcing technology of the shield initiating terminal.
The vertical freezing method is a foundation treatment method which utilizes an artificial refrigeration technology to freeze water in a stratum to form frozen soil, isolates the connection between underground water and underground engineering and carries out underground engineering construction under the protection of a frozen wall. As a temporary foundation reinforcement method, the method is widely applied to urban underground engineering construction such as subway tunnel shield starting and receiving end reinforcement, connection channel reinforcement construction, tunnel emergency and other emergency engineering and the like.
In the prior art, when freezing, the vertical freezing method is used for arranging freezing pipes in the holes of the array in the soil body of the shield initiating end, so that if the whole area of the shield initiating end is completely frozen, the freezing pipes at the tunnel part are dismantled before drilling; and finally, performing shield construction.
The existing technology has the disadvantages that the freezing pipe at the tunnel part must be pulled out before the shield starts to tunnel, and the freezing pipe is often not pulled out well or even broken in the pulling-out process, which causes unnecessary trouble to the shield tunneling machine.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a novel reinforced structure that freezes of tunnel shield initiating terminal to solve the above-mentioned weak point among the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
a novel freezing reinforced structure of a tunnel shield originating end comprises:
a tunnel region;
the first freezing wall is positioned on the outer side of the tunnel region, and a first freezing pipe is arranged in the first freezing wall;
and the second freezing wall is positioned on the outer side of the first freezing wall, a second freezing pipe is arranged in the second freezing wall, and the hardness of the first freezing wall is higher than that of the second freezing wall.
The novel freezing and reinforcing structure at the initial end of the tunnel shield,
and a partition plate is arranged between the first freezing wall and the second freezing wall.
The novel freezing and reinforcing structure at the initial end of the tunnel shield,
the first freezing wall and the second freezing wall are both in an inverted U shape, and an opening of the inverted U shape is vertically downward.
The novel freezing and reinforcing structure at the initial end of the tunnel shield,
the shield tunneling machine further comprises a sleeve, wherein the sleeve is arranged on the outer side of the underground continuous wall at the shield initiating end, and the central axis of the sleeve coincides with the central axis of the tunnel.
The novel freezing and reinforcing structure at the initial end of the tunnel shield,
the other end of the sleeve is fixedly connected to the reaction frame.
In the technical scheme, the novel freezing and reinforcing structure of the tunnel shield initiating terminal provided by the utility model has two layers of freezing walls with different hardness arranged outside the tunnel region, so as to obtain two beneficial effects, wherein one of the two beneficial effects is that the tunnel region is not provided with a freezing pipe, thereby facilitating the shield tunneling construction; and secondly, the two-layer frozen wall with clear layer hardness is safe and reliable, and the cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
Fig. 1 is a longitudinal sectional view of a novel freezing reinforcement structure at an originating end of a tunnel shield according to an embodiment of the present invention;
fig. 2 is a radial cross-sectional view of a novel freezing reinforcement structure at an originating end of a tunnel shield according to another embodiment of the present invention;
fig. 3 is a longitudinal sectional view of a novel freezing reinforcement structure at an originating end of a tunnel shield according to yet another embodiment of the present invention;
fig. 4 is a partial schematic view of a first frozen wall and a second frozen wall according to still another embodiment of the present invention.
Description of reference numerals:
1. a tunnel region; 2. a first frozen wall; 3. a first freezing pipe; 4. a second frozen wall; 5. a second freezing pipe; 6. a sleeve; 7. a reaction frame; 8. an underground diaphragm wall; 9. a partition plate;
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1-4, the novel freezing and reinforcing structure for the originating end of the tunnel shield provided by the embodiment of the present invention includes a tunnel region 1, a first freezing wall 2 and a second freezing wall 4, wherein the first freezing wall 2 is located outside the tunnel region 1, and a first freezing pipe 3 is arranged inside the first freezing wall; the second freezing wall 4 is positioned at the outer side of the first freezing wall 2, a second freezing pipe 5 is arranged in the second freezing wall, and the hardness of the first freezing wall 2 is higher than that of the second freezing wall 4.
Specifically, the tunnel region 1 is located in a region where a tunnel is formed during shield tunneling, and the first frozen wall 2 is an outer side of the tunnel region 1, and in the present invention, the first frozen wall may be an annular structure surrounding the tunnel region 1, or an inverted U-shaped structure surrounding the tunnel region 1, and at this time, the second frozen wall 4 is not located at the bottom (a vertically downward portion) of the tunnel region 1. The second freezes wall 4 and is located the outside of first freezing wall 2, and freezing pipe is put into in the regional equal drilling that first freezing wall 2 and second freezes wall 4 located, puts into first freezing pipe 3 in the first freezing wall 2, puts into second freezing pipe 5 in the second freezing wall 4, freezes the freezing of corresponding region through the intraductal endless refrigerant realization of two types of freezing, and the temperature of two types of refrigerants is different, has formed two regions that the temperature is different naturally: the first freezing wall 2 and the second freezing wall 4, and the circulation temperature of the refrigerant in the first freezing pipe 3 is lower than that of the refrigerant in the second freezing pipe 5, so that the temperature of the first freezing wall 2 is lower, and correspondingly, the soil layer is frozen at a lower temperature and has higher hardness.
In this embodiment, a groove may be formed in advance between the first freezing wall 2 and the second freezing wall 4, and the partition 9 is embedded in the groove, so as to clearly separate the first freezing wall 2 from the second freezing wall 4, and further, the partition 9 is a heat-insulating partition 9, so as to reduce the flow of energy between the first freezing wall 2 and the second freezing wall 4, and reduce energy loss.
In this embodiment, the heat exchange portion of each freezing pipe may be only disposed in a corresponding region, so that heat exchange is only performed in the corresponding region, for example, the first heat exchange pipe performs heat exchange only in the first freezing wall 2, and the rest is disposed as a heat preservation pipe, so that energy loss is reduced.
The embodiment of the utility model provides a novel freezing reinforced structure of tunnel shield initiating terminal sets up two layers of freezing walls with different hardness in the outside of tunnel region 1, so obtains two beneficial effects, and one of them, tunnel region 1 does not set up freezing pipe by itself, is convenient for the shield to dig in the construction; and secondly, two layers of freezing walls with clear layer hardness have higher hardness of the inner layer of freezing wall, and are safe and reliable, and compared with the whole freezing, the cost is saved by local freezing.
The embodiment of the utility model provides a novel reinforced structure that freezes of tunnel shield originating terminal, it is preferred, including the freezing hole on the 1 upper portion of the freezing hole of the 1 left and right sides in tunnel region and tunnel region, respectively freeze the freezing pipe that the downthehole setting is equipped with circulation refrigerant agent, will be close to the shield and construct the water-bearing stratum formation of originating terminal structure and freeze wall waterproof construction. By the aid of the non-closed-loop vertically-frozen shield end reinforcing method, on the premise that construction safety is met, the shield can be kept in a continuous freezing state during tunneling, freezing strength is adjusted according to the construction state, and risks caused by insufficient freezing strength or frozen soil melting in the construction process in the later period due to the fact that a freezing pipe needs to be pulled out are avoided.
In the embodiment, freezing holes are drilled in the water-containing stratum at the originating end of the shield except for the tunnel region 1 at intervals in a parallel state, a freezing pipe filled with a circulating refrigerant is arranged in each freezing hole, and the water-containing stratum adjacent to the end of the originating end of the shield forms a freezing wall structure under the freezing action; the soil layer structure close to the shield is a first frozen wall 2, and the soil layer structure far away from the shield and close to the ground surface is a second frozen wall 4; and an outer sleeve 6 of the end head of the shield initiating end is arranged outside the underground continuous wall 8 of the shield initiating end. Preferably, the freezing holes are distributed on two sides and the upper part of the tunnel, the freezing is not carried out on the excavation part and the lower part of the tunnel, and the sleeve 6 is arranged outside the underground continuous wall 8 and used for overcoming the defect that the tunnel and the lower part of the tunnel are not frozen.
The utility model has the advantages that the low temperature freezing technology is adopted to freeze the left, the right and the upper parts of the shield originating end tunnel to form a high-strength frozen wall structure, and the sleeve 6 is combined to ensure the safe tunneling construction of the shield originating end shield machine, thereby effectively reducing the construction safety risks such as wall collapse and water burst of the soil body after the tunnel portal is dug out; the risk of pulling out the section of the freezing pipe and the like is effectively solved. The subway tunnel shield starting end freezing method construction structure system has the characteristics of simple structure, convenience in construction and reliable quality, provides guarantee for efficient and safe operation of shield starting end personnel and equipment, is beneficial to relieving unnecessary loss and abrasion of shield machine blades, ensures that a tunnel is opened and operated as early as possible, and plays good economic and social benefits.
Referring to fig. 1, a sleeve 6 is installed outside an underground diaphragm wall 8 to overcome the defect that soil in a tunnel and soil below the tunnel are not frozen and ensure the safety of shield launching.
Freezing and reinforcing are carried out according to the following steps:
(1): arranging the drill holes according to a freezing law;
(2): equipment installation-rig installation;
(3): drilling is carried out;
(4): arranging a freezing pipe according to the new method of adding vertical freezing and reinforcing to the sleeve 6 at the starting end of the subway tunnel shield;
(5): freezing is performed.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (5)
1. The utility model provides a novel reinforced structure that freezes of tunnel shield originating terminal which characterized in that includes:
a tunnel region;
the first freezing wall is positioned on the outer side of the tunnel region, and a first freezing pipe is arranged in the first freezing wall;
and the second freezing wall is positioned on the outer side of the first freezing wall, a second freezing pipe is arranged in the second freezing wall, and the hardness of the first freezing wall is higher than that of the second freezing wall.
2. The novel freezing and reinforcing structure of the originating end of the tunnel shield according to claim 1,
and a partition plate is arranged between the first freezing wall and the second freezing wall.
3. The novel freezing and reinforcing structure of the originating end of the tunnel shield according to claim 1,
the first freezing wall and the second freezing wall are both in an inverted U shape, and an opening of the inverted U shape is vertically downward.
4. The novel freezing and reinforcing structure of the originating end of the tunnel shield according to claim 1,
the shield tunneling machine further comprises a sleeve, wherein the sleeve is arranged on the outer side of the underground continuous wall at the shield initiating end, and the central axis of the sleeve coincides with the central axis of the tunnel.
5. The novel freezing and reinforcing structure of the originating end of the tunnel shield as claimed in claim 4,
the other end of the sleeve is fixedly connected to the reaction frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921436813.XU CN210977478U (en) | 2019-08-30 | 2019-08-30 | Novel freezing reinforcing structure for initial end of tunnel shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921436813.XU CN210977478U (en) | 2019-08-30 | 2019-08-30 | Novel freezing reinforcing structure for initial end of tunnel shield |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210977478U true CN210977478U (en) | 2020-07-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921436813.XU Active CN210977478U (en) | 2019-08-30 | 2019-08-30 | Novel freezing reinforcing structure for initial end of tunnel shield |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210977478U (en) |
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2019
- 2019-08-30 CN CN201921436813.XU patent/CN210977478U/en active Active
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