CN114542080B - Vertical freezer with variable freezing effect and working method - Google Patents
Vertical freezer with variable freezing effect and working method Download PDFInfo
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- CN114542080B CN114542080B CN202210048957.8A CN202210048957A CN114542080B CN 114542080 B CN114542080 B CN 114542080B CN 202210048957 A CN202210048957 A CN 202210048957A CN 114542080 B CN114542080 B CN 114542080B
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- 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- 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
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- 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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
Abstract
The invention discloses a vertical freezer with a variable freezing effect and a working method thereof, which are suitable for the technical field of soil freezing. The liquid supply pipe comprises a liquid supply pipe with an interlayer tubular structure, a liquid supply channel is reserved between the inner pipe wall and the outer pipe wall of the liquid supply pipe, the end part of the liquid supply pipe is provided with an upper liquid collection cavity of a hollow annular cake-shaped structure matched with the structure, the liquid return pipe penetrates through the upper liquid collection cavity to be arranged, the end part of the liquid return pipe is provided with a lower liquid collection cavity of the hollow cake-shaped structure, the end part of the liquid return pipe is connected with the center of a circle of the lower liquid collection cavity, and a plurality of curve freezing pipes are arranged between the lower liquid collection cavity and the upper liquid collection cavity. The spindle-shaped freezing curtain is formed at the starting or receiving working well of the shield machine and is coordinated with the stress distribution of the portal outer circular plate-shaped freezing wall, so that the maximum stress in the freezing wall can be reduced, the advantage of difference of freezing effects of freezers at different depths can be fully exerted, the arrangement number of freezing holes can be reduced, and the shield machine has remarkable economic benefit and engineering value.
Description
Technical Field
The invention relates to a freezer with a vertically variable freezing effect and a working method, in particular to a freezer with a vertically variable freezing effect and a working method, which are suitable for starting or receiving construction of a large-diameter shield, and belongs to the technical field of underground engineering construction.
Background
In the construction of the municipal tunnel by the shield method, when the shield penetrates into the stratum from the working well for starting construction or enters into the working well from the stratum for receiving construction, the shield can not directly cut the reinforced concrete groove wall of the working well, so the groove wall at the position of the tunnel door of the working well is generally broken by adopting an artificial method before the shield penetrates through the groove wall of the working well, so that the technical requirement that the shield penetrates through the groove wall of the working well is met. When the outer part of the working well is a soft stratum, the stratum outside the working well needs to be reinforced by a freezing method, and the requirement of maintaining the stability of an external soil body during chiseling of the circular portal is met. According to the stress characteristic of a circular plate-shaped structure under the action of uniformly distributed load, the stress of a circle center part is maximum, and the stress is smaller as the circle center part is farther away from the circle center, while a uniform-thickness freezing wall formed by a long and straight freezing pipe in the traditional freezing process can meet the freezing requirement, but the thickness of the freezing wall of the section of the freezing plate, which is far away from the center part, is consistent with the center position, and the large-thickness freezing wall cannot fully play a role, so that unnecessary waste is caused, and the engineering cost is increased.
Disclosure of Invention
Aiming at the defects of the prior art, the freezer with the variable freezing effect and the working method thereof are used, the structure is simple, the implementation is convenient, the spherical freezing wall with the middle part wall thickness and the peripheral wall thickness can be formed as the interface, the freezing effect is fully utilized, the traditional multi-row hole arrangement is replaced, and the freezing hole and freezing cycle cost is reduced.
In order to achieve the technical purpose, the invention discloses a freezer with a vertically variable freezing effect, which comprises a liquid supply pipe with an interlayer tubular structure, wherein a liquid supply channel is reserved between the inner pipe wall and the outer pipe wall of the liquid supply pipe, a liquid return pipe is movably arranged in the inner pipe wall of the liquid supply pipe, the end part of the liquid supply pipe is provided with an upper liquid collecting cavity with a hollow annular cake-shaped structure, the liquid return pipe penetrates through the upper liquid collecting cavity, the end part of the liquid return pipe is provided with a lower liquid collecting cavity with a hollow cake-shaped structure, the end part of the liquid return pipe is connected with the circle center of the lower liquid collecting cavity, a plurality of curve freezing pipes are arranged between the lower liquid collecting cavity and the upper liquid collecting cavity around the circle center, the insides of the curve freezing pipes are respectively communicated with the upper liquid collecting cavity and the lower liquid collecting cavity to form a cage-shaped structure bending outwards towards a curve, finally, the formed freezing liquid enters the upper liquid collecting cavity through the interlayer structure of the liquid supply pipe, then respectively enters the lower liquid collecting cavity, and finally flows out through the liquid return pipe.
Furthermore, the curve freezing pipe is formed by a curve-shaped steel pipe, and when the liquid collecting cavity and the lower liquid collecting cavity are close to each other under the action of the external force from top to bottom by drawing the liquid return pipe, the steel pipe can be continuously bent, so that the diffusion range of the freezer at different depth positions is changed, the strength of the steel pipe is far greater than that of the surrounding stratum, the bent steel pipe can be easily extruded into the stratum, and different freezing effects of the curve freezing pipe are exerted.
Furthermore, the diameter, thickness, shape and position of the formed freezing wall can be adjusted by changing the diameter of the cylindrical upper liquid collecting cavity and the cylindrical lower liquid collecting cavity, the length of the liquid return pipe and the liquid supply pipe and the length and number of the curve freezing pipes, so that the freezing effect required by different construction working conditions is met.
A working method of a vertical freezer with variable freezing effect comprises the following steps:
the method comprises the steps of arranging freezing drill holes vertically from the ground surface to the outer side of a shield launching or receiving working well in advance, enabling the terminal height of each freezing drill hole to be the lowest position of a shield machine, enabling a freezer with a vertical variable freezing effect to be placed into the drill holes, adjusting the distance between an upper liquid collecting cavity and a lower liquid collecting cavity so as to change the curvature of a curve freezing pipe in the soil of the wall of the drill hole, enabling the freezer to form a freezing curtain with a hammer structure with the largest central diffusion range of a tunnel portal and gradually reduced diffusion range towards the periphery of the tunnel portal at the shield launching or receiving position, injecting freezing liquid into the freezer with the vertical variable freezing effect to freeze the surrounding strata, forming a spinning curtain with the large middle thickness, high strength, small peripheral thickness and low strength at the shield launching or receiving position of the tunnel portal, reinforcing the shield launching or receiving working well, enabling the freezing curtain to be consistent with the shape of a circular plate-shaped freezing wall required when the tunnel portal is broken, and finally conducting chiseling and subsequent shield launching or receiving construction under the maintenance effect of the circular plate-shaped freezing curtain.
The method comprises the following specific steps:
a. selecting proper lengths of a liquid supply pipe and a liquid return pipe according to the diameter of the shield machine and the embedding depth of the shield machine in a soft soil stratum, processing a plurality of curve freezing pipes with proper lengths, enabling the diffusion range of a freezer after bending to meet the freezing design requirement, respectively welding and connecting the freezing pipes with an upper liquid collecting cavity and a lower liquid collecting cavity, determining the positions of the upper liquid collecting cavity and the lower liquid collecting cavity to enable the upper liquid collecting cavity and the lower liquid collecting cavity to cover the tunnel portal, thereby enabling the range of a freezing wall to be formed in an expected manner to be slightly larger than the range of the section of the shield machine, ensuring that the upper liquid collecting cavity connected with the liquid supply pipe is positioned at the upper edge of a tunnel starting or receiving tunnel portal, and the lower liquid collecting cavity connected with the liquid return pipe is positioned at the lower edge of the tunnel portal;
b. constructing a row of drilling holes which are arranged from the ground downwards in the direction of a shield tunneling machine, wherein coins on the outer side of a working well groove wall and on the inner side of the working well groove wall are close to the front of the propelling range of the shield tunneling machine and vertical to the shield tunneling machine, the bottoms of the drilling holes are positioned on the lower horizontal plane of the shield tunneling machine, and a vertical freezer with variable freezing effect is arranged in the drilling holes;
c. the distance between the upper liquid collecting cavity and the lower liquid collecting cavity is reduced through the mutual sliding of the liquid supply pipe and the liquid return pipe, the curvature of the curved freezing pipe is changed, and the curved freezing pipe is extruded into the surrounding soft soil stratum, so that the difference of the freezing range and the freezing effect of the freezer at different depth positions is formed;
d. after a refrigerant is injected into the upper liquid collecting cavity through the liquid supply pipe, the refrigerant flows into the lower liquid collecting cavity along the curved freezing pipe and flows back to a liquid supply system on the ground through the liquid return pipe to form a freezing cycle;
e. through the freezing action of a refrigerant, a freezing curtain with a spindle structure in the middle part and high strength, and sections with small peripheral thickness and low strength is formed at the position of a shield launching or receiving portal, and the height of the freezing curtain is consistent with the height of a freezing wall required when the portal is broken; the stress characteristics of the fusiform frozen wall structure and the circular portal are consistent, the thickness of the frozen wall needed around the portal is small, the thickness of the frozen wall needed in the middle position is large, the pertinence of the formed frozen wall is strong, the frozen wall needed by design can be formed only by arranging a row of freezing pipes, the arrangement number of freezing holes is reduced, and the cold energy is saved;
f. and under the maintenance action of the frozen wall, chiseling the wall of the tunnel portal and starting or receiving construction of a subsequent shield.
Furthermore, after the bending deformation of the curve freezing pipe is finished, whether the curve freezing pipe leaks or not can be monitored through a pressure test method, if the curve freezing pipe leaks, a sleeve pipe with a small diameter can be put into the freezing pipe, and the subsequent freezing construction can still be carried out.
Furthermore, the expansion range of the freezer in the vertical direction is changed by changing the curvature of the curve freezing pipe, and the diffusion ranges of the freezing pipes in the horizontal direction at different depth positions are different, so that the freezing ranges are different, and the freezing effects are different.
Has the beneficial effects that: when the vertical freezer with the variable freezing effect is used in construction, the freezing wall formation requirements under different working conditions can be met only by arranging one row of freezing pipes outside the working well, and the distance between the single row of freezing pipes is larger than that in conventional freezing, so that the arrangement number of the freezing pipes can be greatly reduced in construction, and the engineering investment is saved. Meanwhile, the shape of the spindle-shaped frozen wall formed in the shield advancing direction is coordinated with the stress characteristic when the tunnel portal of the wall of the tunnel is chiseled, so that the thickness of the frozen wall around the tunnel portal is reduced, the cold supply is saved, and the energy required by refrigeration is also saved.
Drawings
FIG. 1 is a schematic view of a vertically variable freezing effect freezer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the application of the freezer in the soil body according to the embodiment of the invention;
fig. 3 is a schematic top view of the application of the frozen wall in the soil body according to the embodiment of the invention.
In the figure: 1-a liquid return pipe; 2-a liquid supply tube; 3-upper liquid collection cavity; 4-curve freezing tube; 5-lower liquid collecting cavity; 6, a shield machine; 7-groove wall; 8-a portal; 9-freezing the curtain; 10-soil body.
Detailed Description
The embodiments of the present application will be further described with reference to the accompanying drawings:
fig. 1 shows a vertical variable freezing effect freezer of the invention, which is characterized in that: the cooling device comprises a liquid supply pipe 2 with an interlayer tubular structure, a liquid supply channel is reserved between the inner pipe wall and the outer pipe wall of the liquid supply pipe 2, a liquid return pipe 1 is movably arranged in the inner pipe wall of the liquid supply pipe 2, an upper liquid collecting cavity 3 with a hollow annular cake-shaped structure is arranged at the end part of the liquid supply pipe 2, the liquid return pipe 1 penetrates through the upper liquid collecting cavity 3, a lower liquid collecting cavity 5 with a hollow cake-shaped structure is arranged at the end part of the liquid return pipe 1, the end part of the liquid return pipe 1 is connected with the circle center of the lower liquid collecting cavity 5, a plurality of curve freezing pipes 4 are arranged between the lower liquid collecting cavity 5 and the upper liquid collecting cavity 3 around the circle center, the interiors of the curve freezing pipes 4 are respectively communicated with the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 to form a cage-shaped structure bending outwards towards curves, finally, the formed cooling liquid enters the upper liquid collecting cavity 3 through the interlayer structure of the liquid supply pipe 2, then respectively enters the lower liquid collecting cavity 5 through the plurality of curve freezing pipes 4, and finally the cooling liquid collecting cavity 5 flows out through the liquid return pipe 1. : the curve freezing pipe 4 is formed by a curve-shaped steel pipe, and when the liquid collecting cavity 3 and the lower liquid collecting cavity 5 are close to each other under the action of the external force from top to bottom by pulling the liquid return pipe 1, the steel pipe can be continuously bent, so that the diffusion range of the freezer at different depth positions is changed, the strength of the steel pipe is far greater than the strength of the surrounding stratum, the bent steel pipe can be easily extruded into the stratum, and different freezing effects of the curve freezing pipe are exerted. The diameter, thickness, shape and position of the formed freezing wall can be adjusted by changing the diameter of the cylindrical upper liquid collecting cavity 3 and the cylindrical lower liquid collecting cavity 5, the length of the liquid return pipe 1 and the liquid supply pipe 2 and the length and number of the curve freezing pipes 4, so that the freezing effect required by different construction working conditions is met.
As shown in fig. 2 and 3, a working method of a freezer with a vertical variable freezing effect comprises the following steps:
the method comprises the steps of arranging freezing drill holes vertically from the ground surface to a soil body 10 from the ground surface to the outer side of a shield launching or receiving working well in advance, enabling the terminal height of each freezing drill hole to be the lowest position of a shield machine, lowering a freezer with a vertical variable freezing effect into the drill holes, adjusting the distance between an upper liquid collecting cavity 3 and a lower liquid collecting cavity 5 so as to change the curvature of a curve freezing pipe 4 in soil of the wall of the drill hole, enabling the freezer to form a freezing curtain 9 with a spindle structure with large thickness in the middle, high strength, small thickness in the periphery and low strength at the position of the shield launching or receiving portal 8 to freeze the surrounding stratum, forming the freezing curtain 9 with the vertical variable freezing effect into the shield launching or receiving working well, enabling the shape of the freezing curtain 9 to be consistent with the shape of a circular plate-shaped freezing wall required when the portal 8 is broken, and finally conducting the cutting of the wall 7 of the shield launching or receiving construction of the shield portal 8 under the maintenance effect of the circular plate-shaped freezing wall.
The method comprises the following specific steps:
a. selecting proper lengths of a liquid supply pipe 2 and a liquid return pipe 1 according to the diameter of a shield machine 6 and the embedding depth of the shield machine in a soil body 10, processing a plurality of curve freezing pipes 4 with proper lengths, enabling the diffusion range of a freezer after bending to meet the freezing design requirement, respectively welding and connecting the freezing pipes with an upper liquid collecting cavity 3 and a lower liquid collecting cavity 5, determining the positions of the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 to enable the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 to cover the position of a tunnel portal 8, so that the range of a freezing wall expected to be formed is slightly larger than the section range of the shield machine, ensuring that the upper liquid collecting cavity 3 connected with the liquid supply pipe 2 is positioned at the upper edge of the tunnel portal 8 and the lower liquid collecting cavity 5 connected with the liquid return pipe 1 is positioned at the lower edge of the tunnel portal 8;
b. a row of drilled holes which are arranged downwards from the ground are constructed in the front of the propelling range of the shield tunneling machine 6, close to the outer side of the working well groove wall 7 and the inner side of the working well groove wall 7 in a coin dividing mode and perpendicular to the shield tunneling direction of the shield tunneling machine 6, the bottoms of the drilled holes are located on the lower horizontal plane of the shield tunneling machine 6, and a vertical freezer with a variable freezing effect is arranged in the drilled holes;
c. the distance between the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 is reduced by the mutual sliding of the liquid supply pipe 2 and the liquid return pipe 1, the curvature of the curved freezing pipe 4 is changed, and the curved freezing pipe 4 is extruded into the surrounding soft soil stratum, so that the difference of the freezing range and the freezing effect of the freezer at different depth positions is formed;
d. after a refrigerant is injected into the upper liquid collecting cavity 3 through the liquid supply pipe 2, the refrigerant flows into the lower liquid collecting cavity 5 along the curved freezing pipe 4 and flows back to a liquid supply system on the ground through the liquid return pipe 1 to form a freezing cycle;
e. through the freezing action of a refrigerant, a freezing curtain 9 with a spindle structure in the section with large thickness and high strength in the middle and small thickness and low strength on the periphery is formed in a soil body 10 of a shield launching or receiving portal 8, and the height position of the freezing curtain 9 is consistent with the height of a freezing wall required when the portal 8 is broken; the stress characteristics of the spindle-shaped frozen wall structure and a circular structural tunnel portal 8 generated by the shield tunneling machine 6 are consistent, the thickness of the frozen wall needed around the tunnel portal 8 is small, the thickness of the frozen wall needed in the middle position is large, the pertinence of the formed frozen wall is strong, the frozen wall needed by design can be formed only by arranging one row of freezing pipes, the arrangement number of freezing holes is reduced, and the cooling capacity is saved;
f. under the maintenance action of the frozen wall, the wall 7 of the tunnel portal 8 is chiseled and the subsequent shield launching or receiving construction is carried out.
After the bending deformation of the curve freezing pipe 4 is finished, whether the curve freezing pipe 4 leaks or not can be monitored by means of pressure testing, if the curve freezing pipe 4 leaks, a sleeve pipe with a small diameter can be put into the freezing pipe, and subsequent freezing construction can still be carried out. The expansion range of the freezer in the vertical direction is changed by changing the curvature of the curve freezing pipe 4, and the diffusion ranges of the freezing pipes in the horizontal direction at different depth positions are different, so that the freezing ranges are different, and the freezing effects are different.
The first embodiment,
A vertical freezer with variable freezing effect and a working method thereof structurally comprise: the freezing device comprises a liquid supply pipe 2, a liquid return pipe 1, an upper liquid collecting cavity 3, a plurality of curve freezing pipes 4 and a lower liquid collecting cavity 5, wherein the liquid supply pipe 2 connected with the upper liquid collecting cavity 3 fixes the position of the upper liquid collecting cavity 3, the liquid return pipe 1 penetrating through the liquid supply pipe 2 and connected with the lower liquid collecting cavity 5 fixes the position of the lower liquid collecting cavity 5, the distance between the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 can be changed through the relative sliding of the liquid supply pipe 2 and the liquid return pipe 1, so that the curvature of the curve freezing pipes 4 is changed and the curve freezing pipes are extruded into the soil 10 of the surrounding soft soil layer, and the difference of the freezing range and the freezing effect of the freezing device at different depth positions is formed.
In the freezer with the vertical variable freezing effect and the working method thereof, the following steps are required:
a. according to the diameter of the shield 6 and the embedding depth in a soft soil stratum, the lengths of the liquid supply pipe 2 and the liquid return pipe 1 are selected appropriately, a plurality of curve freezing pipes 4 with appropriate lengths are processed and are respectively connected with the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 in a welded mode, and the positions of the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 are determined.
b. In the external drilling of a shield originating or receiving working well, because the strength of the soft soil stratum is lower, in order to maintain the stability of the hole wall during drilling, mud needs to be filled during drilling to play a role of protecting the wall, and the mud foams the surrounding stratum to be soft, so that the strength of the stratum is further reduced,
c. the liquid supply pipe 2 and the liquid return pipe 1 are enabled to slide relatively by applying reverse acting force, the distance between the upper liquid collecting cavity 3 and the lower liquid collecting cavity 5 is reduced, the curvature of the curve freezing pipe 4 is changed, and the curve freezing pipe 4 can be embedded into the soil body 10 when being stressed and bent under the condition of a low-strength soil body 10;
d. selecting proper lengths of a liquid supply pipe 2, a liquid return pipe 1 and a curved freezing pipe 4 according to the reinforcement requirement of a shield starting or receiving working well, so that the diffusion range of the bent freezer meets the freezing design requirement, and an upper liquid collecting cavity 3 connected with the liquid supply pipe 2 is ensured to be positioned at the upper edge of a shield starting or receiving tunnel portal, and a lower liquid collecting cavity 5 connected with the liquid return pipe 1 is ensured to be positioned at the lower edge of the tunnel portal;
e. after being injected into the upper liquid collecting cavity 3 through the liquid supply pipe 2, the refrigerant flows into the lower liquid collecting cavity 5 along the curved freezing pipe 4 and flows back to a liquid supply system on the ground through the liquid return pipe 1 to form a freezing cycle;
f. through the freezing action of a refrigerant, a freezing curtain 9 with large thickness and high strength in the middle and small thickness and low strength at the periphery is formed at the position of a shield launching or receiving portal and is consistent with the shape of a circular plate-shaped freezing wall required when the portal is broken;
g. under the maintenance action of the frozen wall, chiseling the wall 7 of the tunnel portal 8 and starting or receiving construction of a subsequent shield are carried out.
Claims (6)
1. A vertical variable freezes freezer of effect which characterized in that: the freezing liquid cooling device comprises a liquid supply pipe (2) with an interlayer tubular structure, a liquid supply channel is reserved between the inner pipe wall and the outer pipe wall of the liquid supply pipe (2), a liquid return pipe (1) is movably arranged in the inner pipe wall of the liquid supply pipe (2), an upper liquid collecting cavity (3) with a hollow annular cake-shaped structure matched with the structure is arranged at the end part of the liquid supply pipe (2), the liquid return pipe (1) penetrates through the upper liquid collecting cavity (3) to be arranged, a lower liquid collecting cavity (5) with a hollow cake-shaped structure is arranged at the end part of the liquid return pipe (1), the end part of the liquid return pipe (1) is connected with the circle center of the lower liquid collecting cavity (5), a plurality of curve freezing pipes (4) are arranged between the lower liquid collecting cavity (5) and the upper liquid collecting cavity (3) around the circle center, the interiors of the curve freezing pipes (4) are respectively communicated with the upper liquid collecting cavity (3) and the lower liquid collecting cavity (5) to form a cage-shaped structure bending outwards towards a curve, finally, the freezing liquid enters the upper liquid collecting cavity (3) through the interlayer tubular structure of the liquid supply pipe (2), and then flows out through the lower liquid collecting cavity (5) and finally, and flows out through the freezing pipes (5); the curve freezing pipe (4) is formed by a curve-shaped steel pipe, when the upper liquid collecting cavity (3) and the lower liquid collecting cavity (5) are close to each other under the action of the external force from top to bottom by drawing the liquid return pipe (1), the steel pipe is continuously bent, so that the diffusion range of the freezer at different depth positions is changed, the strength of the steel pipe is far greater than the strength of the surrounding stratum, the bent steel pipe is easily extruded into the stratum, and different freezing effects of the curve freezing pipe are exerted.
2. A vertically variable freezing effect freezer according to claim 1, characterised in that: the diameters of the cylindrical upper liquid collecting cavity (3) and the cylindrical lower liquid collecting cavity (5), the lengths of the liquid return pipe (1) and the liquid supply pipe (2) and the lengths and the number of the curved freezing pipes (4) are changed, so that the diameters, the thicknesses, the shapes and the positions of the formed freezing walls can be adjusted, and the freezing effects required by different construction working condition conditions are met.
3. A method of operating a freezer using the vertically variable freezing effect of claim 1, characterized by the steps of:
the method comprises the steps of arranging freezing drill holes vertically from the ground surface to the soil body (10) from the ground surface to the outer side of a shield starting or receiving working well in advance, enabling the terminal height of each freezing drill hole to be the lowest position of a shield machine, enabling a freezer with a vertical variable freezing effect to be placed into the drill holes, adjusting the distance between an upper liquid collecting cavity (3) and a lower liquid collecting cavity (5) to change the curvature of a curve freezing pipe (4) in soil of the wall of the drill hole, enabling the freezer to form the largest central diffusion range of a tunnel portal (8) and gradually reducing the diffusion range of the periphery of the tunnel portal (8) at the starting or receiving position of the shield, injecting freezing liquid into the freezer with the vertical variable freezing effect to freeze surrounding strata, forming a freezing screen (9) with a spindle structure with large thickness, high strength, small thickness and low strength at the periphery at the starting or receiving tunnel portal (8) position of the shield, and reinforcing the shield starting or receiving working well, enabling the freezing screen (9) to be consistent with the shape of the circular plate freezing wall required when the starting or receiving tunnel portal (8) is broken, and finally performing subsequent shield construction of a curtain (8) and shield receiving working well wall or shield receiving.
4. The working method according to claim 3, characterized by the specific steps of:
a. selecting the length of a proper liquid supply pipe (2) and a proper liquid return pipe (1) according to the diameter of a shield machine (6) and the embedding depth in a soil body (10), processing a plurality of curve freezing pipes (4) with proper lengths, enabling the diffusion range of a bent freezer to meet the freezing design requirement, respectively welding and connecting the bent freezer with an upper liquid collecting cavity (3) and a lower liquid collecting cavity (5), determining the positions of the upper liquid collecting cavity (3) and the lower liquid collecting cavity (5) to enable the upper liquid collecting cavity (3) and the lower liquid collecting cavity (5) to cover the position of a tunnel portal (8), so that the range of a freezing wall which is expected to be formed is slightly larger than the section range of the shield machine, ensuring that the upper liquid collecting cavity (3) connected with the liquid supply pipe (2) is positioned at the upper edge of a shield starting or receiving tunnel portal (8), and the lower liquid collecting cavity (5) connected with the liquid return pipe (1) is positioned at the lower edge of the tunnel portal (8);
b. a row of drilling holes which are arranged downwards from the ground are respectively constructed in the direction vertical to the shield direction of the shield tunneling machine (6) in the front of the propelling range of the shield tunneling machine (6) and close to the outer side of the wall (7) of the working well and the inner side of the wall (7) of the working well, the bottoms of the drilling holes are positioned on the lower horizontal plane of the shield tunneling machine (6), and a vertical freezer with variable freezing effect is arranged in the drilling holes;
c. the distance between the upper liquid collecting cavity (3) and the lower liquid collecting cavity (5) is reduced by the mutual sliding of the liquid supply pipe (2) and the liquid return pipe (1), the curvature of the curved freezing pipe (4) is changed, and the curved freezing pipe (4) is extruded into the surrounding soft soil stratum, so that the difference of the freezing range and the freezing effect of the freezer at different depth positions is formed;
d. after a refrigerant is injected into the upper liquid collecting cavity (3) through the liquid supply pipe (2), the refrigerant flows into the lower liquid collecting cavity (5) along the curved freezing pipe (4) and flows back to a liquid supply system on the ground through the liquid return pipe (1) to form a freezing cycle;
e. through the freezing action of a refrigerant, a freezing curtain (9) with large thickness and high strength in the middle and a spindle-structured section with small thickness and low strength at the periphery is formed in a soil body (10) of a shield launching or receiving portal (8), and the height of the freezing curtain (9) is consistent with the height of a freezing wall required when the portal (8) is broken; the stress characteristics of the spindle-shaped frozen wall structure and a circular structure portal (8) generated by the shield machine (6) are consistent, the thickness of the frozen wall needed around the portal (8) is small, the thickness of the frozen wall needed in the middle position is large, the pertinence of the formed frozen wall is strong, the frozen wall needed by design can be formed only by arranging one row of freezing pipes, the arrangement number of freezing holes is reduced, and the cooling capacity is saved;
f. under the maintenance action of the frozen wall, the wall (7) of the tunnel portal (8) is chiseled and the subsequent shield is started or received for construction.
5. The method of operation of claim 4, wherein: after the bending deformation of the curve freezing pipe (4) is finished, whether the curve freezing pipe (4) leaks or not is monitored by means of pressure testing, and if the curve freezing pipe leaks, a sleeve pipe with a small diameter is put into the freezing pipe, so that subsequent freezing construction can be still performed.
6. The method of operation of claim 4, wherein: the expansion range of the freezer in the vertical direction is changed by changing the curvature of the curve freezing pipe (4), and the diffusion ranges of the freezing pipes in the horizontal direction at different depth positions are different, so that the freezing ranges are different.
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| CN202210048957.8A CN114542080B (en) | 2022-01-17 | 2022-01-17 | Vertical freezer with variable freezing effect and working method |
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| CN202210048957.8A CN114542080B (en) | 2022-01-17 | 2022-01-17 | Vertical freezer with variable freezing effect and working method |
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2022
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|---|---|---|---|---|
| CN103898895A (en) * | 2014-04-22 | 2014-07-02 | 北京中煤矿山工程有限公司 | Freezing device with coaxial liquid supply pipe and liquid return pipe |
| CN205501986U (en) * | 2015-12-26 | 2016-08-24 | 海南大学 | Curve freezing pipe |
| JP2017150174A (en) * | 2016-02-23 | 2017-08-31 | 清水建設株式会社 | Freezing method |
| JP2017166211A (en) * | 2016-03-16 | 2017-09-21 | ケミカルグラウト株式会社 | Freezing method |
| CN206189386U (en) * | 2016-11-16 | 2017-05-24 | 海南大学 | Cavity ring shape freezing pipe |
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| CN114542080A (en) | 2022-05-27 |
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