CN111535296A - Layered grouting freezing device and layered grouting freezing method - Google Patents
Layered grouting freezing device and layered grouting freezing method Download PDFInfo
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- CN111535296A CN111535296A CN202010404416.5A CN202010404416A CN111535296A CN 111535296 A CN111535296 A CN 111535296A CN 202010404416 A CN202010404416 A CN 202010404416A CN 111535296 A CN111535296 A CN 111535296A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
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Abstract
The invention provides a layered grouting freezing device and a layered grouting freezing method, wherein the layered grouting freezing device comprises: the layered grouting pipeline comprises a liquid return pipe, a grouting pipe and a freezing pipe; the layered grouting pipeline comprises a plurality of pipeline monomers, a slurry pipe is arranged on at least one part of the pipeline monomers, the slurry pipe is communicated with the outside of the layered grouting pipeline and the grouting pipe, and a non-return device is arranged on the slurry pipe. According to the invention, the slurry pipes can be directly arranged on the pipeline monomers corresponding to the underground water layer according to address exploration data, and when the soil body is pre-reinforced before freezing and reinforced after grouting, slurry can be injected into the underground water layer, so that the soil body reinforcement and the water stop effect on the underground water layer are better ensured.
Description
Technical Field
The invention belongs to the technical field of freezing equipment, and particularly relates to a layered grouting freezing device and a layered grouting freezing method.
Background
The artificial stratum freezing technology is that before the underground engineering construction, a certain number of freezing holes are drilled around the underground space to be excavated, freezers are installed in the freezing holes, so that low-temperature freezing liquid flows in the freezers to absorb heat of the stratum around the freezers, and water in the stratum is frozen: the natural soil body is changed into frozen soil, underground water is separated, freezing cylinders are formed in loose, water-containing and unstable stratums, the freezing cylinders are gradually enlarged and connected into a closed cylinder (namely a freezing ring) meeting the design thickness and strength, and subsequent safe and reliable shaft sinking construction is guaranteed. The artificial stratum freezing technology is a special construction method for temporarily reinforcing stratum and isolating underground water by means of artificial refrigeration, and utilizes freezing ring to resist soil and water pressure and isolate underground water so as to make the shaft sinking equipment pass through the stratum containing water safely.
However, the manual frozen soil thawing and sinking deformation can be generated by the manual layer freezing technology, and the influence of hot melting settlement and compaction settlement caused by the manual frozen soil thawing and sinking deformation on the surrounding environment is large, so that the non-uniform settlement of the tunnel is easily caused, and the durability and the normal operation are influenced. The pre-grouting reinforcement is carried out before the freezing method construction, so that the functions of inhibiting the post-construction thaw collapse and reducing the influence on surrounding buildings can be achieved to a certain extent, and the formation is prevented from generating uneven settlement to a certain extent. At present, grouting and freezing construction in engineering need to be respectively punched, and multiple times of punching can result in improvement of engineering quantity, construction period and construction cost, more water and soil loss and influence on soil layer stability.
The invention patent with the publication number of CN2071143915U discloses a double-pipe annular grouting freezing pipe, which comprises an inner ring grouting pipe, an outer ring freezing pipe and a drill bit; the inner ring grouting pipe is embedded in the outer ring freezing pipe and communicated with the drill bit, a gap between the top surface of the grouting pipe and the drill bit is sealed, and at least one grout outlet is formed in the drill bit. The double-pipe annular grouting freezing pipe can realize the function of pre-grouting, can be used for freezing the bottom layer in the later period, avoids grouting and freezing to punch holes respectively, is low in operation difficulty, saves cost, shortens the construction period and reduces water and soil loss, so that the settlement of the bottom layer after the freezing method construction is better controlled, and the influence on the surrounding environment is reduced. However, the double-pipe annular grouting freezing pipe can only perform grouting through a drill bit, and the grouting position has no pertinence, so that the effects of soil body reinforcement and water stop on an underground water layer are influenced.
Therefore, it is desirable to provide a layered grouting freezing device and a freezing method which are not sufficient for the above prior art.
Disclosure of Invention
The invention discloses a layered grouting freezing device and a layered grouting freezing method, and aims to solve the problems that in the prior art, a grouting position of a double-pipe annular grouting freezing pipe is not targeted, and the soil body reinforcement and the water stopping effect on an underground water layer are influenced.
In order to achieve the above purpose, the invention provides the following technical scheme: a layered grouting freezing device, comprising:
the layered grouting pipeline comprises a liquid return pipe, a grouting pipe and a freezing pipe;
the layered grouting pipeline comprises a plurality of pipeline monomers, and adjacent pipeline monomers are in threaded connection; a slurry pipe is arranged on at least one part of the pipeline monomer, the slurry pipe is arranged along the radial direction of the pipeline monomer, the slurry pipe is communicated with the outside of the layered grouting pipeline and the grouting pipe, and a check device is arranged on the slurry pipe;
the drill bit is arranged at the bottom of the layered grouting pipeline and is provided with a backflow cavity, and the liquid return pipe and the freezing pipe are both communicated with the backflow cavity; the top of the liquid return pipe is connected with the freezing liquid outlet outer pipe, the top of the freezing pipe is connected with the freezing liquid supply outer pipe, and the top of the grouting pipe is connected with the slurry inlet outer pipe.
Furthermore, the layered grouting pipeline is sequentially provided with a grouting pipe, a liquid return pipe and a freezing pipe from inside to outside, and the grouting pipe, the liquid return pipe and the freezing pipe form a concentric cylinder.
Furthermore, the slurry pipes are provided with at least three layers along the axial direction of the pipeline monomer, each layer is provided with at least four slurry pipes, and the slurry pipes are uniformly distributed along the circumferential direction.
Furthermore, a grouting exhaust pipeline is arranged at the top of the grouting pipe, and a grouting exhaust valve is arranged on the grouting exhaust pipeline;
preferably, the top of the liquid return pipe is provided with a liquid return exhaust pipeline, and the liquid return exhaust pipeline is provided with a liquid return exhaust valve.
Furthermore, a support frame is arranged between two adjacent layers of the slurry pipes, and comprises a first support frame and a second support frame;
the first support frame is positioned between the grouting pipe and the liquid return pipe, and two ends of the first support frame in the horizontal direction are fixedly connected with the grouting pipe and the liquid return pipe respectively;
the second support frame is located back the liquid pipe and freezes between the pipe, the both ends of second support frame horizontal direction respectively with freeze pipe, return liquid pipe fixed connection the support frame is used for to the thick liquid pipe supports and fixes.
Further, the non-return device comprises an outer pipe and an inner pipe, and the outer pipe is sleeved outside the inner pipe;
one end of the inner tube is a closed end, a spring is arranged between the closed end and the outer tube, a liquid inlet of the inner tube is formed at the other end of the inner tube, and a liquid outlet of the inner tube is formed in the tube wall of the inner tube;
the outer pipe comprises an inner pipe and an outer pipe, the outer pipe and the inner pipe enclose a liquid outlet cavity, one end of the liquid outlet cavity, which is close to the liquid inlet of the inner pipe, is closed, and one end of the liquid outlet cavity, which is far away from the liquid inlet of the inner pipe, forms a liquid outlet of the outer pipe;
the inner wall of the inner-layer pipe is attached to the outer wall of the inner pipe, an outer pipe liquid inlet is formed in the inner-layer pipe, and the outer pipe liquid inlet is communicated with the liquid outlet cavity;
the slurry exerts axial pressure on the inner pipe, and the spring is used for exerting axial elastic force on the inner pipe, and the direction of the axial pressure is opposite to that of the axial elastic force;
the inner pipe can axially move in the inner pipe, and when the axial pressure and the axial elasticity reach balance in the moving process, the inner pipe stops axially moving in the inner pipe so as to control the overlapping and staggered position between the liquid outlet of the inner pipe and the liquid inlet of the outer pipe, thereby controlling whether the non-return device can pass through slurry; preferably, the inner pipe has an open position and a closed position in the inner pipe, and when the inner pipe is in the open position, the slurry can pass through the check device; when the inner tube is in a closed position, slurry cannot pass through the non-return device;
the closed positions comprise a first closed position and a second closed position, and the first closed position and the second closed position are respectively positioned on two sides of the open position on the moving stroke of the inner pipe.
Further, when the inner pipe is in the open position, the axial pressure value is called set pressure, and the set pressure of the non-return device on the slurry pipe is sequentially reduced and increased on the layered grouting pipeline from top to bottom.
The layered grouting freezing method comprises the following steps:
drilling a vertical freezing hole in a soil body, and installing a layered grouting pipeline in the freezing hole on the premise that the depth of a slurry pipe of a layered grouting freezing device corresponds to the depth of an underground water layer according to geological exploration data;
secondly, performing pre-grouting reinforcement on the soil body through a layered grouting freezing device;
thirdly, injecting a freezing liquid into the freezing pipe through a layered grouting freezing device to freeze the water in the soil body;
and fourthly, grouting and reinforcing after freezing the soil body through a layered grouting freezing device.
Further, the second step specifically includes: opening a grouting exhaust valve arranged at the top of a grouting pipe, injecting grout into the grouting pipe, wherein the injection pressure of the grout is less than the set pressure of a bottommost non-return device, discharging air in the grouting pipe from the grouting exhaust valve, closing the grouting exhaust valve, and performing pre-grouting reinforcement on a soil body through a layered grouting freezing device;
preferably, the third step specifically includes: and opening a liquid return exhaust valve arranged at the top of the liquid return pipe, injecting freezing liquid into the liquid return pipe, discharging air in the liquid return pipe from the liquid return exhaust valve, closing the liquid return exhaust valve, and injecting the freezing liquid into the freezing pipe through a layered grouting freezing device to freeze moisture in soil.
Further, the second step further includes: after pre-grouting and consolidation before freezing, injecting saline water into the grouting pipe, wherein the initial injection pressure of the saline water is equal to the set pressure of the lowest non-return device, and the volume of the saline water is not less than the volume of the grouting pipe, so that the grout in the grouting pipe is discharged;
the injection pressure of the increased brine is reduced to the set pressure of the uppermost non-return device until all the slurry in the slurry pipe is discharged, and the brine injection is stopped.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1) set up the thick liquid pipe on the pipeline monomer, can be according to the address exploration data, directly set up the thick liquid pipe on the pipeline monomer that the groundwater layer corresponds, when consolidating in advance and when consolidating after the slip casting is carried out to the soil body before freezing, can carry out the injection of thick liquid to the groundwater layer, better assurance is consolidated the soil body and is to the effect of groundwater layer stagnant water, layering slip casting pipeline is formed by the equipment of a plurality of pipeline monomers, does not need the transport means of overlength, the transportation of being convenient for.
2) The layering slip casting pipeline is slip casting pipe, liquid return pipe and freezing the pipe from inside to outside in proper order, and slip casting pipe, liquid return pipe and freezing the pipe and constitute concentric drum, freeze the pipe and set up in the outside and be complete tubular structure, can guarantee the effect of freezing to the soil layer, the both sides that can not appear layering slip casting pipeline in the contrast file are freezing pipe and wet return respectively, lead to freezing the condition that the efficiency is different.
3) The slurry pipes are provided with at least three layers along the axial direction of the pipeline monomers, each layer of slurry pipes is provided with at least four positions, and the slurry pipes are uniformly distributed in the circumferential direction of the layered grouting pipeline, so that the effects of soil body reinforcement and water stop on an underground water layer can be further ensured.
4) The top of slip casting pipe is equipped with slip casting exhaust duct, is equipped with slip casting discharge valve on the slip casting exhaust duct, can discharge the intraductal air of slip casting through slip casting discharge valve cooperation thick liquid outer tube, further guarantees the effect of slip casting to soil body reinforcement and to groundwater layer stagnant water. The top of the liquid return pipe is provided with a liquid return exhaust pipe, the liquid return exhaust pipe is provided with a liquid return exhaust valve, and air in the liquid return pipe can be exhausted by matching the liquid return exhaust valve with the frozen liquid supply outer pipe before freezing, so that the freezing efficiency is improved.
5) The supporting frame is arranged, the slurry pipe is supported and fixed through the supporting frame, the radial relative positions of the grouting pipe, the liquid return pipe and the freezing pipe are guaranteed simultaneously, and the use reliability of the layered grouting freezing device is guaranteed.
6) The inner pipe, the outer pipe and the spring directly form a non-return device, the structure is simple, and the cost is low; the check device is directly controlled by controlling the pressure of the slurry, and the operation is simple.
7) The set pressure of the non-return device on the slurry pipe is sequentially increased from top to bottom on the layered grouting pipeline, and layered grouting on a groundwater layer can be realized by controlling grouting pressure;
after the pre-grouting consolidation, injecting saline water into the grouting pipes, wherein the initial injection pressure of the saline water is equal to the set pressure of the lowest non-return device, the injection volume of the saline water is not less than the volume of the grouting pipes, discharging the grout in the grouting pipes from the lowest grout pipe, reducing the injection pressure of the saline water to the set pressure of the uppermost non-return device, and stopping injecting the saline water until all the grout in the grouting pipes are discharged; the slurry can be prevented from being blocked in the slurry pipe, and the reinforcing effect of grouting reinforcement after freezing is guaranteed.
8) According to the address exploration data, the slurry pipe is directly arranged on the pipeline monomer corresponding to the underground water layer, when the soil body is pre-reinforced before freezing and reinforced after grouting is carried out on the soil body, slurry can be injected into the underground water layer, and the effects of soil body reinforcement and water stop on the underground water layer are well guaranteed.
9) The top of slip casting pipe is equipped with slip casting exhaust duct, is equipped with slip casting discharge valve on the slip casting exhaust duct, can discharge the intraductal air of slip casting through slip casting discharge valve cooperation thick liquid outer tube, further guarantees the effect of slip casting to soil body reinforcement and to groundwater layer stagnant water. The top of the liquid return pipe is provided with a liquid return exhaust pipe, the liquid return exhaust pipe is provided with a liquid return exhaust valve, and air in the liquid return pipe can be exhausted by matching the liquid return exhaust valve with the frozen liquid supply outer pipe before freezing, so that the freezing efficiency is improved.
10) When the flow velocity of a certain underground water layer is high, the inner pipe of the non-return device of the slurry pipe corresponding to the water layer with high flow velocity is in an open position for a long time by controlling the grouting pressure, the slurry pipe below the water layer with high flow velocity is in a first closed position, and the slurry pipe above the water layer with high flow velocity is in a second closed position; pre-grouting and reinforcing the water layer with the larger flow rate in a targeted manner; the effect of pre-grouting reinforcement is ensured, and the waste of slurry is avoided.
Drawings
Fig. 1 is a schematic structural view of a specific embodiment 1 of the layered grouting freezing device of the present invention;
FIG. 2 is a front view of the second single pipe in FIG. 1;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic diagram of the construction of the drill bit of FIG. 1;
FIG. 5 is a schematic view of the top plate of FIG. 1;
FIG. 6 is a schematic view of the structure of the abort device of FIG. 1;
in the figure: 1. a freezing pipe; 2. a liquid return pipe; 3. a grouting pipe 4 and a second pipeline monomer; 4-1, a slurry pipe; 4-2, a non-return device; 4-2-1, inner tube; 4-2-2, outer tube; 4-2-3, a liquid inlet of the inner pipe; 4-2-4, an outer tube liquid outlet; 4-2-5, inner tube liquid outlet; 4-2-6, and a liquid inlet of an outer pipe; 4-2-7, a spring; 4-2-8, liquid outlet cavity; 4-3, a first support frame; 4-4, a second support frame; 5. a drill bit; 5-1, a reflux cavity; 6. a top plate; 6-1, a freezing pipe liquid inlet joint; 6-2, grouting a pressure gauge; 6-3, grouting pipe joints; 6-4, grouting pipe exhaust joint; 6-5, a liquid return pipe liquid discharge joint; 6-6, a liquid return pipe exhaust ball valve; 6-7, liquid inlet ball valve; 6-8, grouting a ball valve; 6-9, grouting pipe exhaust ball valve; 6-10, a liquid outlet ball valve; 7. connecting threads; 8. a first conduit monomer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The specific embodiment 1 of the layered grouting freezing device of the invention:
as shown in fig. 1, the layered grouting freezing device comprises a layered grouting pipeline, the layered grouting pipeline comprises a liquid return pipe 2, a grouting pipe 3 and a freezing pipe 1, the grouting pipe 3, the liquid return pipe 2 and the freezing pipe 1 are sequentially arranged from inside to outside to form a concentric cylinder, and the bottom of the grouting pipe 3 is closed. As shown in fig. 4, a drill bit 5 is arranged at the bottom of the layered grouting pipeline, the drill bit 5 is arranged at the bottom of the layered grouting pipeline in a threaded connection mode, the drill bit 5 is provided with a backflow cavity 5-1, the liquid return pipe 2 and the freezing pipe 1 are both communicated with the backflow cavity 5-1, and the freezing pipe 1, the backflow cavity 5-1 and the liquid return pipe 2 form a low-temperature freezing liquid flow channel.
As shown in fig. 2 and 3, the layered grouting pipe includes a plurality of single pipes, and the pipe walls of the liquid return pipes, the grouting pipe and the freezing pipe at the two ends of the single pipes are all provided with connecting threads 7; the pipeline monomers are connected through screw threads. The number of the single pipelines can be adjusted according to the engineering requirement, so that the length of the layered grouting pipeline required by the engineering can be met. The pipeline monomer includes first pipeline monomer 8 and second pipeline monomer 4, and the difference lies in being equipped with slurry pipe 4-1 on the second pipeline monomer 4, and slurry pipe 4-1 sets up along the radial of second pipeline monomer 4, and slurry pipe 4-1 intercommunication layering slip casting pipeline's outside and slip casting pipe 3. The arrangement and combination sequence of the first pipeline monomer 8 and the second pipeline monomer 4 is adjusted according to the field construction condition so as to ensure that the depth of the slurry pipe 4-1 corresponds to the depth of the underground water layer.
As shown in FIG. 2, the slurry pipe 4-1 is provided with three layers along the axial direction of the second pipe unit 4, each layer of slurry pipe 4-1 has four slurry pipes 4-1, and the slurry pipes 4-1 are uniformly arranged in the circumferential direction.
A support frame is arranged between two adjacent layers of slurry pipes 4-1, and comprises a first support frame 4-3 and a second support frame 4-4; the first support frame 4-3 is positioned between the grouting pipe 3 and the liquid return pipe 2, and two ends of the first support frame 4-3 in the horizontal direction are respectively fixedly connected with the grouting pipe 3 and the liquid return pipe 2; the first support frame 4-3 not only ensures the radial relative position of the grouting pipe 3 and the liquid return pipe 2, but also can support the slurry pipe 4-1.
The second support frame 4-4 is positioned between the liquid return pipe 2 and the freezing pipe 1, two ends of the second support frame 4-4 in the horizontal direction are respectively and fixedly connected with the freezing pipe 1 and the liquid return pipe 2, and the second support frame 4-4 not only ensures the radial relative positions of the freezing pipe 1 and the liquid return pipe 2, but also can support the slurry pipe 4-1.
As shown in FIG. 6, a non-return device 4-2 is arranged on the slurry pipe 4-1, the non-return device 4-2 comprises an outer pipe 4-2-2 and an inner pipe 4-2-1, and the outer pipe 4-2-2 is sleeved outside the inner pipe 4-2-1; one end of the inner tube 4-2-1 is a closed end, a spring 4-2-7 is arranged between the closed end and the outer tube 4-2-2, the spring 4-2-7 is used for applying axial elasticity to the inner tube 4-2-1, the other end of the inner tube 4-2-1 is provided with an inner tube liquid inlet 4-2-3, and the tube wall of the inner tube 4-2-1 is provided with an inner tube liquid outlet 4-2-5. The outer pipe 4-2-2 comprises an inner pipe and an outer pipe, the outer pipe and the inner pipe enclose a liquid outlet cavity 4-2-8, one end of the liquid outlet cavity 4-2-8, which is close to the liquid inlet 4-2-3 of the inner pipe, is closed, and one end of the liquid outlet cavity 4-2-8, which is far away from the liquid inlet 4-2-3 of the inner pipe, forms a liquid outlet 4-2-4 of the outer pipe; the inner wall of the inner layer pipe is jointed with the outer wall of the inner pipe 4-2-1. The inner layer pipe is provided with an outer pipe liquid inlet 4-2-6; the liquid inlet 4-2-6 of the outer tube is communicated with the liquid outlet cavity 4-2-8. The inner pipe 4-2-1 can move in the inner pipe along the axial direction, and the movement stroke of the inner pipe 4-2-1 in the inner pipe has an opening position and a closing position; when the inner pipe 4-2-1 is in an open position, the position of the liquid inlet 4-2-6 of the outer pipe corresponds to the position of the liquid outlet 4-2-5 of the inner pipe, and slurry passes through the non-return device 4-2 along the liquid inlet 4-2-3 of the inner pipe, the liquid outlet 4-2-5 of the inner pipe, the liquid inlet 4-2-6 of the outer pipe and the liquid outlet 4-2-4 of the outer pipe; when the inner pipe 4-2-1 is in a closed position, the positions of the liquid inlet 4-2-6 of the outer pipe and the liquid outlet 4-2-5 of the inner pipe are staggered, the liquid outlet cavity 4-2-8 is not communicated with a cavity enclosed by the inner pipe 4-2-1, and the slurry cannot pass through the non-return device 4-2. The closed positions include a first closed position and a second closed position which are located on both sides of the open position on the moving stroke of the inner tube 4-2-1, respectively.
The slurry exerts axial pressure on the inner tube 4-2-1, the spring 4-2-7 is used for exerting axial elasticity on the inner tube 4-2-1, and the direction of the axial pressure is opposite to that of the axial elasticity; when the axial pressure and the axial elastic force are balanced in the moving stroke of the inner pipe 4-2-1, the inner pipe 4-2-1 has a fixed position in the inner pipe and stops moving. That is, when the axial pressure is not available or is small, the compression amount of the spring 4-2-7 is small, the inner pipe 4-2-1 is in the first closing position, the liquid inlet 4-2-6 of the outer pipe is staggered with the liquid outlet 4-2-5 of the inner pipe, and the slurry cannot pass through the non-return device 4-2. When the axial pressure reaches the set pressure, the compression amount of the spring 4-2-7 enables the inner pipe 4-2-1 to be in an open position, the liquid inlet 4-2-6 of the outer pipe is overlapped with the liquid outlet 4-2-5 of the inner pipe, and the slurry passes through the non-return device 4-2 along the liquid inlet 4-2-3 of the inner pipe, the liquid outlet 4-2-5 of the inner pipe, the liquid inlet 4-2-6 of the outer pipe and the liquid outlet 4-2-4 of the outer pipe. When the axial pressure exceeds the set pressure, the compression amount of the spring 4-2-7 is larger, the inner pipe 4-2-1 is in the second closing position, the liquid inlet 4-2-6 of the outer pipe is staggered with the liquid outlet 4-2-5 of the inner pipe, and the slurry can not pass through the non-return device 4-2.
When the inner pipe 4-2-1 is in an open position, the axial pressure value is called set pressure, and the set pressure of the check device 4-2 on the slurry pipe 4-1 is sequentially increased from top to bottom on the layered grouting pipeline.
As shown in fig. 5, a top plate 6 is connected to the top of the layered grouting pipeline in a threaded manner to plug the top of the liquid return pipe 2, the grouting pipe 3 and the freezing pipe 1, the top plate 6 is provided with a freezing pipe liquid inlet joint 6-1 communicated with the freezing pipe 1, a liquid inlet ball valve 6-7 is mounted on the freezing pipe liquid inlet joint 6-1, and the freezing pipe liquid inlet joint 6-1 is used for being connected with a freezing liquid supply outer pipe.
The top plate 6 is provided with a liquid return pipe liquid discharging joint 6-5 communicated with the liquid return pipe 2, the liquid outlet ball valve 6-10 is arranged on the liquid return pipe liquid discharging joint 6-5, and the liquid return pipe liquid discharging joint 6-5 is used for being connected with a frozen liquid outlet outer pipe. A liquid return pipe exhaust ball valve 6-6 is arranged on the liquid return pipe liquid discharge joint 6-5, the liquid return pipe exhaust ball valve 6-6 is positioned at the upstream of the liquid outlet ball valve 6-10, the liquid return pipe exhaust ball valve 6-6 is used for discharging air in the liquid return pipe 2 to ensure the freezing effect on the stratum, and the liquid return pipe exhaust ball valve 6-6 forms a liquid return pipe exhaust valve.
The top plate 6 is provided with a grouting pipe joint 6-3 communicated with the grouting pipe 3, the grouting pipe joint 6-3 is used for being connected with a grouting outer pipe, a grouting ball valve 6-8 and a grouting pressure gauge 6-2 are arranged on the grouting pipe joint 6-3, and the grouting pressure gauge 6-2 is convenient for observing grouting pressure and adjusting the grouting pressure in time. The top plate 6 is provided with a grouting pipe exhaust joint 6-4 communicated with the grouting pipe 3, the grouting pipe exhaust joint 6-4 is provided with a grouting pipe exhaust ball valve 6-9, the grouting pipe exhaust ball valve 6-9 is convenient for discharging air in the grouting pipe 3 before grouting, the grouting reinforcement effect is ensured, and the grouting pipe exhaust ball valve 6-9 forms a grouting pipe exhaust valve.
The specific embodiment 2 of the layered grouting freezing device of the invention: the difference between this embodiment and embodiment 1 is that, in embodiment 1, the layered grouting pipe grouting pipeline adopts a form of arranging and combining the first pipeline monomer and the second pipeline monomer, and in this embodiment, the layered grouting pipe grouting pipeline does not include the first pipeline monomer and is formed by sequentially connecting the second pipeline monomers, and at this time, the grouting reinforcement performance of the layered grouting freezing device is better, but the usage amount of grout is larger.
The specific embodiment 3 of the layered grouting freezing device of the invention: the difference between this embodiment and embodiment 1 is that in embodiment 1, a grouting pipe, a liquid return pipe, and a freezing pipe are sequentially arranged in a grouting pipe of a layered grouting pipe from inside to outside, and the grouting pipe, the liquid return pipe, and the freezing pipe form a concentric cylinder.
The specific embodiment 4 of the layered grouting freezing device of the invention: the present embodiment is different from embodiment 1 in that in embodiment 1, the slurry pipe is provided with three layers along the axial direction of the second pipe unit, and each layer of slurry pipe has four slurry pipes. In this embodiment, the slurry pipe is provided with five layers along the axial direction of the second pipe unit, and each layer of slurry pipe is provided with six slurry pipes.
The specific embodiment 5 of the layered grouting freezing device of the invention: the present embodiment is different from embodiment 1 in that in embodiment 1, slurry pipes are arranged in three layers along the axial direction of the pipe single body, and each layer of slurry pipe has four slurry pipes. In this embodiment, the slurry pipe is provided with two layers along the axial direction of the second pipe unit, and each layer of slurry pipe has three slurry pipes.
Specific embodiment 6 of the layered grouting freezing apparatus of the present invention: the difference between this embodiment and embodiment 1 is that, in embodiment 1, the liquid return pipe and the freezing pipe are provided with through holes, the slurry supply pipe penetrates through the through holes, and a support frame is arranged between two adjacent layers of slurry pipes and supports and fixes the slurry pipes. In this embodiment, do not set up the support frame, only rely on fenestrate pore wall to support the thick liquid pipe.
The embodiment 7 of the layered grouting freezing device of the invention: the present embodiment is different from embodiment 1 in that in embodiment 1, the check device is composed of an inner tube, an outer tube and a spring, and in this embodiment, a common swing check valve is used as the check device.
The embodiment 8 of the layered grouting freezing device of the invention: the difference between this embodiment and embodiment 1 is that in embodiment 1, the set pressure of the check device on the grout pipe is sequentially raised from top to bottom on the grouting pipe of the stratified grouting pipe. In this embodiment, the non-return devices arranged in each layer of slurry pipe have different set pressures and are arranged disorderly in the axial direction of the layered grouting pipe grouting pipeline.
The specific embodiment 1 of the layered grouting freezing method of the invention:
firstly, drilling a vertical freezing hole in a soil body, and installing a layered grouting pipeline in the freezing hole on the premise of ensuring that the depth of a slurry pipe 4-1 of a layered grouting freezing device corresponds to the depth of an underground water layer according to geological exploration data;
secondly, opening a grouting exhaust valve arranged at the top of the grouting pipe 3, injecting grout into the grouting pipe 3, wherein the injection pressure of the grout is less than the set pressure of the lowest non-return device 4-2, so that air in the grouting pipe 3 is discharged from the grouting exhaust valve, and after the grouting exhaust valve overflows with the grout, closing the grouting exhaust valve;
gradually increasing grouting pressure, constantly observing the grouting pressure displayed by a grouting pressure gauge 6-2, pre-grouting reinforcement before freezing a soil body from bottom to top through a layered grouting freezing device, in the pre-grouting reinforcement process, if the flow velocity of a certain underground water layer is large, controlling the grouting pressure to enable the inner pipe 4-2-1 of the non-return device 4-2 of the slurry pipe 4-1 corresponding to the water layer with large flow velocity to be in an open position for a long time, enabling the slurry pipe 4-1 below the water layer with large flow velocity to be in a first closed position, and enabling the slurry pipe 4-1 above the water layer with large flow velocity to be in a second closed position, so that the water layer with large flow velocity is pre-grouting reinforcement pertinently, and the slurry waste is reduced.
After pre-grouting and consolidation, injecting saline water into the grouting pipe 3, wherein the initial injection pressure of the saline water is equal to the set pressure of the lowest non-return device 4-2, the injection volume of the saline water is not less than the volume of the grouting pipe 3, and discharging the grout in the grouting pipe 3 from the lowest grout pipe 4-1;
reducing the injection pressure of the brine to the set pressure of the uppermost non-return device 4-2 until all the grout in the grouting pipe 4-1 is discharged, and stopping injecting the brine;
thirdly, opening a liquid return exhaust valve arranged at the top of the liquid return pipe 2, injecting freezing liquid into the liquid return pipe 2 to discharge air in the liquid return pipe 2 from the liquid return exhaust valve, closing the liquid return exhaust valve, injecting low-temperature freezing liquid into the freezing pipe 1 through a layered grouting freezing device, enabling the low-temperature freezing liquid to flow along the paths of the freezing pipe 1, the backflow cavity 5-1 and the liquid return pipe 2, and enabling the low-temperature freezing liquid to absorb heat in soil mass to freeze water in the soil mass;
and fourthly, after the underground engineering construction is completed, freezing the soil body by a layered grouting freezing device and then grouting and reinforcing.
The specific embodiment 2 of the layered grouting freezing method of the invention: the difference between the embodiment and the specific embodiment 1 is that before the soil body is subjected to pre-grouting reinforcement, the gas in the grouting pipe is not discharged through the grouting exhaust valve.
The specific embodiment 4 of the layered grouting freezing method of the invention: this embodiment differs from the embodiment 1 in that the inner tubes of the non-return means of the pulp tubes of each layer are in the open position for the same time.
The specific embodiment 5 of the layered grouting freezing method of the invention: this example differs from the specific example 1 in that after the pre-grouting and consolidation are completed before freezing, the slurry is not discharged from the slurry pipe and the grouting pipe.
In summary, in the layered grouting freezing device and the layered grouting freezing method provided by the invention:
1) set up the thick liquid pipe on the pipeline monomer, can be according to the address exploration data, directly set up the thick liquid pipe on the pipeline monomer that the groundwater layer corresponds, when consolidating in advance and when consolidating after the slip casting is carried out to the soil body before freezing, can carry out the injection of thick liquid to the groundwater layer, better assurance is consolidated the soil body and is to the effect of groundwater layer stagnant water, layering slip casting pipeline is formed by the equipment of a plurality of pipeline monomers, does not need the transport means of overlength, the transportation of being convenient for.
2) The layering slip casting pipeline is slip casting pipe, liquid return pipe and freezing the pipe from inside to outside in proper order, and slip casting pipe, liquid return pipe and freezing the pipe and constitute concentric drum, freeze the pipe and set up in the outside and be complete tubular structure, can guarantee the effect of freezing to the soil layer, the both sides that can not appear layering slip casting pipeline in the contrast file are freezing pipe and wet return respectively, lead to freezing the condition that the efficiency is different.
3) The slurry pipes are provided with at least three layers along the axial direction of the pipeline monomers, each layer of slurry pipes is provided with at least four positions, and the slurry pipes are uniformly distributed in the circumferential direction of the layered grouting pipeline, so that the effects of soil body reinforcement and water stop on an underground water layer can be further ensured.
4) The top of slip casting pipe is equipped with slip casting exhaust duct, is equipped with slip casting discharge valve on the slip casting exhaust duct, can discharge the intraductal air of slip casting through slip casting discharge valve cooperation thick liquid outer tube, further guarantees the effect of slip casting to soil body reinforcement and to groundwater layer stagnant water. The top of the liquid return pipe is provided with a liquid return exhaust pipe, the liquid return exhaust pipe is provided with a liquid return exhaust valve, and air in the liquid return pipe can be exhausted by matching the liquid return exhaust valve with the frozen liquid supply outer pipe before freezing, so that the freezing efficiency is improved.
5) The supporting frame is arranged, the slurry pipe is supported and fixed through the supporting frame, the radial relative positions of the grouting pipe, the liquid return pipe and the freezing pipe are guaranteed simultaneously, and the use reliability of the layered grouting freezing device is guaranteed.
6) The inner pipe, the outer pipe and the spring directly form a non-return device, and the non-return device is simple in structure and low in cost. The check device is directly controlled by controlling the pressure of the slurry, and the operation is simple.
7) The set pressure of the non-return device on the slurry pipe is sequentially increased from top to bottom on the layered grouting pipeline, and layered grouting on a groundwater layer can be realized by controlling grouting pressure;
after the pre-grouting consolidation, injecting saline water into the grouting pipes, wherein the initial injection pressure of the saline water is equal to the set pressure of the lowest non-return device, the injection volume of the saline water is not less than the volume of the grouting pipes, discharging the grout in the grouting pipes from the lowest grout pipe, reducing the injection pressure of the saline water to the set pressure of the uppermost non-return device, and stopping injecting the saline water until all the grout in the grouting pipes are discharged; the slurry can be prevented from being blocked in the slurry pipe, and the reinforcing effect of grouting reinforcement after freezing is guaranteed.
8) According to the address exploration data, the slurry pipe is directly arranged on the pipeline monomer corresponding to the underground water layer, when the soil body is pre-reinforced before freezing and reinforced after grouting is carried out on the soil body, slurry can be injected into the underground water layer, and the effects of soil body reinforcement and water stop on the underground water layer are well guaranteed.
9) The top of slip casting pipe is equipped with slip casting exhaust duct, is equipped with slip casting discharge valve on the slip casting exhaust duct, can discharge the intraductal air of slip casting through slip casting discharge valve cooperation thick liquid outer tube, further guarantees the effect of slip casting to soil body reinforcement and to groundwater layer stagnant water. The top of the liquid return pipe is provided with a liquid return exhaust pipe, the liquid return exhaust pipe is provided with a liquid return exhaust valve, and air in the liquid return pipe can be exhausted by matching the liquid return exhaust valve with the frozen liquid supply outer pipe before freezing, so that the freezing efficiency is improved.
10) When the flow velocity of a certain underground water layer is high, the inner pipe of the non-return device of the slurry pipe corresponding to the water layer with high flow velocity is in an open position for a long time by controlling the grouting pressure, the slurry pipe below the water layer with high flow velocity is in a first closed position, and the slurry pipe above the water layer with high flow velocity is in a second closed position; pre-grouting and reinforcing the water layer with the larger flow rate in a targeted manner; the effect of pre-grouting reinforcement is ensured, and the waste of slurry is avoided.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The layered grouting freezing device is characterized by comprising:
the layered grouting pipeline comprises a liquid return pipe, a grouting pipe and a freezing pipe;
the layered grouting pipeline comprises a plurality of pipeline monomers, and adjacent pipeline monomers are in threaded connection; a slurry pipe is arranged on at least one part of the pipeline monomer, the slurry pipe is arranged along the radial direction of the pipeline monomer, the slurry pipe is communicated with the outside of the layered grouting pipeline and the grouting pipe, and a check device is arranged on the slurry pipe;
the drill bit is arranged at the bottom of the layered grouting pipeline and is provided with a backflow cavity, and the liquid return pipe and the freezing pipe are both communicated with the backflow cavity; the top of the liquid return pipe is connected with the freezing liquid outlet outer pipe, the top of the freezing pipe is connected with the freezing liquid supply outer pipe, and the top of the grouting pipe is connected with the slurry inlet outer pipe.
2. The layered grouting freezing device according to claim 1, wherein the layered grouting pipeline comprises a grouting pipe, a liquid return pipe and a freezing pipe from inside to outside in sequence, and the grouting pipe, the liquid return pipe and the freezing pipe form a concentric cylinder.
3. The stratified grouting freezing apparatus according to claim 1 or 2, wherein the grout pipes are arranged in at least three layers in the axial direction of the single pipe, each layer having at least four grout pipes, and a plurality of the grout pipes are uniformly arranged in the circumferential direction.
4. The layered grouting freezing device according to claim 1 or 2, wherein a grouting exhaust pipeline is arranged at the top of the grouting pipe, and a grouting exhaust valve is arranged on the grouting exhaust pipeline;
preferably, the top of the liquid return pipe is provided with a liquid return exhaust pipeline, and the liquid return exhaust pipeline is provided with a liquid return exhaust valve.
5. The layered grouting freezing device according to claim 3, wherein a support frame is arranged between two adjacent layers of the grout pipes, and the support frame comprises a first support frame and a second support frame; the first support frame and the second support frame are used for supporting and fixing the slurry pipe;
the first support frame is positioned between the grouting pipe and the liquid return pipe, and two ends of the first support frame in the horizontal direction are fixedly connected with the grouting pipe and the liquid return pipe respectively;
the second support frame is located back between the liquid pipe and freezing the pipe, the both ends of second support frame horizontal direction respectively with freeze pipe, return liquid pipe fixed connection.
6. The stratified grouting freezing apparatus according to claim 1 or 2, wherein the check means includes an outer pipe and an inner pipe, the outer pipe being sleeved outside the inner pipe;
one end of the inner tube is a closed end, a spring is arranged between the closed end and the outer tube, a liquid inlet of the inner tube is formed at the other end of the inner tube, and a liquid outlet of the inner tube is formed in the tube wall of the inner tube;
the outer pipe comprises an inner pipe and an outer pipe, the outer pipe and the inner pipe enclose a liquid outlet cavity, one end of the liquid outlet cavity, which is close to the liquid inlet of the inner pipe, is closed, and one end of the liquid outlet cavity, which is far away from the liquid inlet of the inner pipe, forms a liquid outlet of the outer pipe;
the inner wall of the inner-layer pipe is attached to the outer wall of the inner pipe, an outer pipe liquid inlet is formed in the inner-layer pipe, and the outer pipe liquid inlet is communicated with the liquid outlet cavity;
the slurry exerts axial pressure on the inner pipe, and the spring is used for exerting axial elastic force on the inner pipe, and the direction of the axial pressure is opposite to that of the axial elastic force;
the inner pipe can axially move in the inner pipe, and when the axial pressure and the axial elasticity reach balance in the moving process, the inner pipe stops axially moving in the inner pipe so as to control the overlapping and staggered position between the liquid outlet of the inner pipe and the liquid inlet of the outer pipe, thereby controlling whether the non-return device can pass through slurry; preferably, the inner pipe has an open position and a closed position in the inner pipe, and when the inner pipe is in the open position, the slurry can pass through the check device; when the inner tube is in a closed position, slurry cannot pass through the non-return device;
the closed positions comprise a first closed position and a second closed position, and the first closed position and the second closed position are respectively positioned on two sides of the open position on the moving stroke of the inner pipe.
7. The stratified slurry casting freezing apparatus as claimed in claim 6, wherein the axial pressure has a value called set pressure when the inner pipe is in the open position, and the set pressure of the back-flow preventing means on the slurry pipe is sequentially raised from top to bottom on the stratified slurry casting pipeline.
8. A method of stratified grouting freezing in a stratified grouting freezing apparatus as claimed in any one of claims 1 to 7, characterized in that the method of stratified grouting freezing comprises the steps of:
drilling a vertical freezing hole in a soil body, and installing a layered grouting pipeline in the freezing hole on the premise that the depth of a slurry pipe of a layered grouting freezing device corresponds to the depth of an underground water layer according to geological exploration data;
secondly, performing pre-grouting reinforcement on the soil body through a layered grouting freezing device;
thirdly, injecting a freezing liquid into the freezing pipe through a layered grouting freezing device to freeze the water in the soil body;
and fourthly, grouting and reinforcing after freezing the soil body through a layered grouting freezing device.
9. The layered grouting freezing method according to claim 8, wherein the second step specifically comprises: opening a grouting exhaust valve arranged at the top of a grouting pipe, injecting grout into the grouting pipe, wherein the injection pressure of the grout is less than the set pressure of a bottommost non-return device, discharging air in the grouting pipe from the grouting exhaust valve, closing the grouting exhaust valve, and performing pre-grouting reinforcement on a soil body through a layered grouting freezing device;
preferably, the third step specifically includes: and opening a liquid return exhaust valve arranged at the top of the liquid return pipe, injecting freezing liquid into the liquid return pipe, discharging air in the liquid return pipe from the liquid return exhaust valve, closing the liquid return exhaust valve, and injecting the freezing liquid into the freezing pipe through a layered grouting freezing device to freeze moisture in soil.
10. The layered grouting freezing method according to claim 8 or 9, wherein the second step further comprises: after pre-grouting and consolidation before freezing, injecting saline water into the grouting pipe, wherein the initial injection pressure of the saline water is equal to the set pressure of the lowest non-return device, and the volume of the saline water is not less than the volume of the grouting pipe, so that the grout in the grouting pipe is discharged;
the brine injection pressure is reduced to the set pressure of the uppermost non-return device until all the slurry in the slurry pipe is discharged and the brine injection is stopped.
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