Controllable sectional pressure relief device and pressure relief method in freezing construction

Abstract

The application discloses a controllable sectional pressure relief device in frozen construction, which comprises a combined pressure relief pipe, a drill bit and an operating wrench; a single section of the combined pressure relief pipe comprises a pressure relief flower pipe arranged outside and an inner pipe closely combined with the inner wall of the pressure relief flower pipe, and the inner pipe can rotate in the pressure relief flower pipe; a plurality of outer mud holes are arranged on the peripheral wall of the pressure relief flower pipe at intervals, the peripheral wall of the inner pipe is provided with inner mud holes corresponding to the outer mud holes one by one, and an inner wrenching plate is fixedly arranged on the inner wall of the inner pipe; the device is exquisite in structure, practical in function and simple to operate; the pressure relief method can rotate the inner cylinder of the combined pressure relief pipe at the corresponding position in the mud hole according to the monitoring value of the ground uplift to open the mud hole channel, so that the strata at multiple depths / drilling depths can be relieved, and the controllable and accurate sectional pressure relief of the soil layer can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of frost heaving pressure release. Specifically, it is a controllable segmented pressure release device and method in freezing construction. BACKGROUND

[0002] Freezing method is a special construction technology that uses artificial refrigeration technology to freeze water in the stratum, changes natural rock and soil into frozen soil, increases its strength and stability, and isolates groundwater from underground engineering, so as to carry out the construction of shaft or underground engineering under the protection of freezing wall. However, frost heaving phenomenon will occur during the formation of freezing wall, which can easily cause the bottom to rise and may cause the structure of the upper ground surface road and building to be damaged, so appropriate measures need to be taken to control frost heaving to reduce the problem of frost heaving caused by freezing construction.

[0003] The control of frost heaving generally includes measures such as enhancing soil strength, soil layer pressure release, and forced thawing, among which, soil layer pressure release is the most commonly used control measure. Usually, settlement detection points are arranged on the ground surface, and pressure release holes are set around the freezing wall, and flower pipes are installed in the pressure release holes for pressure release; according to the monitoring values of the settlement monitoring points, when the bottom rises to a certain degree, the valve of the pressure release flower pipe is opened, so that the mud water in the stratum can be discharged from the pressure release flower pipe. However, at present, when the pressure is released, the pressure release of soil layers at different depths / drilling depths needs to be carried out in several times by sending the pressure release flower pipe into the target area or burying multiple pressure release flower pipes at different depths at the same time, and it is not possible to realize the pressure release of soil layers at multiple depths / positions by a single drilling of a pressure release flower pipe. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to provide a controllable segmented pressure release device and method in freezing construction, which can realize the pressure release of soil layers at different depths / drilling depths by a single flower pipe.

[0005] To solve the above technical problems, the present application provides the following technical solutions:

[0006] The application discloses a controllable sectional pressure relief device in a freezing construction method, which comprises a combined pressure relief pipe, a drill bit and an operating wrench, a plurality of the combined pressure relief pipes are spliced with each other and used, and the drill bit is arranged at the front end of the combined pressure relief pipe after splicing; one combined pressure relief pipe comprises a pressure relief flower pipe arranged outside and an inner pipe closely arranged on the inner wall of the pressure relief flower pipe, the inner pipe can rotate in the pressure relief flower pipe; a plurality of outer mud holes are arranged on the circumferential wall of the pressure relief flower pipe at intervals, the inner pipe is provided with inner mud holes corresponding to the outer mud holes, the inner wall of the inner pipe is fixedly provided with an inner turning plate, the operating wrench can be inserted into the inner pipe and drive the inner pipe to rotate along the circumferential direction of the pressure relief flower pipe by pushing the inner turning plate, so that the inner mud holes are aligned with the outer mud holes or completely staggered; the inner mud holes are aligned with the outer mud holes to open the mud hole channel, and the inner mud holes are completely staggered with the outer mud holes to close the mud hole channel.

[0007] Further, the inner pipe comprises a rotating drum and a rubber pad fixed to the outer periphery of the rotating drum, and the rubber pad is closely attached to the inner wall of the pressure relief flower pipe.

[0008] Further, the length of the inner pipe is less than the length of the pressure relief flower pipe, and the inner wall of the pressure relief flower pipe is fixedly provided with a stop ring for limiting the inner pipe at both ends.

[0009] Further, the number of the inner turning plates is one or more, the operating wrench comprises an operating rod with an outer diameter less than the inner diameter of the inner pipe and an outer turning plate protruding and fixed to one end of the circumferential surface of the operating rod, and there is a spacing space between two adjacent inner turning plates, allowing the outer turning plate to extend into the spacing space.

[0010] Further, the number of the inner turning plates and the outer turning plates is two, and the inner turning plates and the outer turning plates are uniformly arranged.

[0011] Further, the length of one combined pressure relief pipe is 1.5-2.0 m, the length of the outer mud hole accounts for 50%-80% of the length of the combined pressure relief pipe, and the central angle of a single outer mud hole is 15°-135°; the length of the inner turning plate is 5-10 cm, the radial height of the inner turning plate is 1.0-1.5 cm; the inner diameter of the pressure relief flower pipe is 80-100 mm, the inner diameter of the inner pipe is 65-90 mm, and the outer diameter of the operating rod is less than 40 mm.

[0012] The application further discloses a controllable sectional pressure relief method in a freezing construction method, which uses the controllable sectional pressure relief device in the freezing construction method.

[0013] The surface is arranged with a settlement monitoring point to monitor the surface settlement during the freezing construction;

[0014] The pressure relief hole is arranged, and a combined pressure relief pipe is installed in the pressure relief hole to release pressure;

[0015] According to the monitoring amount of the ground uplift, when the monitoring amount of the ground is greater than the early warning value, the inner cylinder of the combined pressure relief pipe at the corresponding position in the mud discharge hole is rotated by operating the wrench, so that the inner mud discharge hole in the combined pressure relief pipe is aligned with the outer mud discharge hole, and the mud discharge hole is opened; the inner cylinder of the combined pressure relief pipe at the corresponding position in the mud discharge hole is rotated by operating the wrench, so that the inner mud discharge hole in the combined pressure relief pipe is completely misaligned with the outer mud discharge hole, and the mud discharge hole is closed.

[0016] The technical scheme of the present application has the following beneficial technical effects:

[0017] The device structure is ingenious, the function is practical, and the operation is simple; after a spliced combined pressure relief pipe is inserted into the stratum, the opening and closing of the mud discharge hole are realized by rotating the inner pipe with the control of the operating wrench, the stratum at multiple depths / drilling depths can be relieved, and the controllable and accurate segmented pressure relief of the soil layer can be realized; compared with the conventional pressure relief flower pipe, the number of pressure relief pipes lowered during the one-time freezing method construction is reduced, and the soil layer at different positions can be relieved after the one-time flower pipe is lowered, under the premise that the combined pressure relief pipe is not drilled again. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the application of the embodiment of the present application;

[0019] Figure 2 It is a structure schematic view of the single-section combined pressure relief pipe of the embodiment of the present application;

[0020] Figure 3 It is a structure schematic view of the combined pressure relief pipe in state one of the embodiment of the present application;

[0021] Figure 4 It is a structure schematic view of the combined pressure relief pipe in state two of the embodiment of the present application;

[0022] Figure 5 It is a cross-sectional view schematic view of the operating wrench of the embodiment of the present application;

[0023] Figure 6 It is a cross-sectional view schematic view of the operating wrench of the embodiment of the present application from another perspective.

[0024] The reference signs in the drawing are as follows: 1-pressure relief flower pipe, 2-outer mud discharge hole, 3-rubber pad, 4-rotary cylinder, 5-inner pulling plate, 6-inner mud discharge hole, 7-outer pulling plate, 8-retaining ring, 9-operating rod, 10-orifice pipe, 11-drill rod, and 12-drill bit. DETAILED DESCRIPTION

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] like Figures 1 to 6 As shown, a controllable segmented pressure relief device for freezing construction includes a combined pressure relief pipe, a drill bit 12, and an operating wrench. Multiple sections of the combined pressure relief pipe are spliced ​​together for use. The drill bit 12 is installed at the very front end of the spliced ​​combined pressure relief pipe, facilitating drilling into the soil and simultaneously sealing the very front end of the combined pressure relief pipe, ensuring that the mud and water slurry during pressure relief can only be discharged from the other end of the combined pressure relief pipe. In actual use, a borehole pipe 10 is installed at the drilling location. The required number of combined pressure relief pipes and the number of drill rods 11 without mud discharge holes are calculated. The drill rods 11 are connected to the tail ends of all the combined pressure relief pipes, pushing the combined pressure relief pipes into the area below the surface structure to be pressure-relieved. Each section of the combined pressure relief pipe includes an external pressure relief perforated pipe 1 and an inner pipe tightly fitted to the inner wall of the pressure relief perforated pipe 1. The inner tube can rotate within the pressure relief perforated pipe 1; a plurality of external mud discharge holes 2 are spaced apart on the peripheral wall of the pressure relief perforated pipe 1, and an inner mud discharge hole 6 corresponding one-to-one with the external mud discharge holes 2 is provided on the peripheral wall of the inner tube; an inner lever plate 5 is fixedly installed on the inner wall of the inner tube, and the operating wrench can be inserted into the inner tube and drive the inner tube to rotate circumferentially along the pressure relief perforated pipe 1 by pushing the inner lever plate 5, so that the inner mud discharge hole 6 is aligned with or completely staggered with the external mud discharge hole 2; the state when the inner mud discharge hole 6 is aligned with the external mud discharge hole 2 is called state one, at which time the mud discharge channel is opened, and the mud and water in the formation can flow into the inner tube from the mud discharge channel and be discharged outside the formation along the spliced ​​combined pressure relief pipe; the state when the inner mud discharge hole 6 is completely staggered with the external mud discharge hole 2 is called state two, at which time the mud discharge channel is closed;

[0027] The position of the inner wrenching plate 5 in each section combined pressure relief pipe is fixed, so that by controlling the length of the operation wrench inserted, the outer wrenching plate 7 on the operation wrench can reach the position of the combined pressure relief pipe required to be relieved, and the combined pressure relief pipe is in state one when drilling, after drilling in place, the outer wrenching plate 7 pushes the inner wrenching plate 5 to rotate by rotating the operation wrench manually or by the drilling machine, the rotation of the inner pipe relative to the pressure relief pipe 1 is realized, and after rotating to a specified angle, the alignment of the inner mud hole 6 and the outer mud hole 2 and the opening of the mud hole channel are realized, that is, the switching of the combined pressure relief pipe from state one to state two is realized; according to the need of stratum pressure relief, multiple mud hole channels can be opened at the same time; the specified angle refers to the angle after rotation, which makes the outer mud hole 2 and the inner mud hole 6 from complete interlacing to complete overlap; when the site requiring pressure relief no longer requires pressure relief, the mud hole channel at the corresponding position is closed by reversing the rotation or continuing the forward rotation of the operation wrench to the above specified angle, and the combined pressure relief pipe is switched from state two back to state one; the device of the application can realize pressure relief of multiple depths / drilling depths of strata through a single pipe, and realize controllable and accurate segmented pressure relief of soil layers.

[0028] As shown in Figures 1 to 2 , the inner mud hole 6 and the outer mud hole 2 are generally arranged at the middle position of each section combined pressure relief pipe, and the inner wrenching plate 5 is preferably fixed at the position of the two ends of the inner pipe without holes; in other embodiments, the inner wrenching plate 5 can also be fixed at the middle part of the inner pipe, as long as it is away from the position of the inner mud hole 6.

[0029] As shown in Figures 1 to 4 , the size of the inner mud hole 6 and the outer mud hole 2 can be the same or different, but obviously the size of the mud hole channel is determined by the size of the smallest mud hole; preferably, the inner mud hole 6 and the outer mud hole 2 are arranged to have the same size.

[0030] As shown in Figures 1 to 4 , the inner pipe includes a rotating cylinder 4 and a rubber pad 3 fixed on the outer periphery of the rotating cylinder 4, and correspondingly, the rubber pad 3 is provided with a mud hole corresponding to the inner mud hole 6; the rubber pad 3 is adhesively fixed on the outer periphery of the rotating cylinder 4, and the rubber pad 3 is tightly attached to the inner wall of the pressure relief pipe 1, and the rubber pad 3 plays the role of sealing the gap between the pressure relief pipe 1 and the inner pipe.

[0031] As shown in Figures 1 to 2As shown, the length of the inner tube is less than the length of the pressure relief flower tube 1, and the inner wall of the pressure relief flower tube 1 is welded and fixed at both ends to be provided with a stop ring 8 for limiting the inner tube, and the stop ring 8 limits the rotation of the inner tube in the pressure relief flower tube 1; the connecting components are arranged at both ends of the pressure relief flower tube 1, which are similar to the splicing mode of the flower tube or the drill rod 11 in the prior art, and the connecting components between the two pressure relief flower tubes 1 can be connected by threads or other connection modes.

[0032] As shown in the figure, Figures 1 to 4 As shown, the number of the inner wrenching plates 5 is one or more, and when the number of the inner wrenching plates 5 is more, the inner wrenching plates 5 are uniformly arranged, the operating wrench includes an operating rod 9 with an outer diameter less than the inner diameter of the inner tube and an outer wrenching plate 7 protruding and fixed at one end of the outer surface of the operating rod 9, and there is a spacing space between two adjacent inner wrenching plates 5 for allowing the outer wrenching plate 7 to extend into; preferably, the number of the inner wrenching plates 5 and the outer wrenching plates 7 is 2, so that there is a larger allowable error angle when the operating wrench extends into the inner tube, and the inner wrenching plates 5 can be touched and aligned to be pushed within the rotation range of 180 degrees of the operating wrench.

[0033] In one embodiment, the length of a single section of the combined pressure relief pipe is 1.5-2.0 m, the length of the outer mud hole 2 accounts for 50%-80% of the length of the combined pressure relief pipe, and the central angle corresponding to a single outer mud hole 2 is 15°-135°; the length of the inner wrenching plate 5 is 5-10 cm, and the radial height of the inner wrenching plate 5 is 1.0-1.5 cm; the inner diameter of the pressure relief flower tube 1 is 80-100 mm, the inner diameter of the inner tube is 65-90 mm, and the outer diameter of the operating rod 9 is less than 40 mm; in a specific embodiment, the length of a single section of the combined pressure relief pipe is 1.5 m, the length of the outer mud hole 2 accounts for 80% of the length of the combined pressure relief pipe, and the central angle corresponding to a single outer mud hole 2 is 30°; the length of the inner wrenching plate 5 is 10 cm, and the radial height of the inner wrenching plate 5 is 1.5 cm; the inner diameter of the pressure relief flower tube 1 is 80 mm, the inner diameter of the inner tube is 70 mm, and the outer diameter of the operating rod 9 is 35 mm.

[0034] The application also provides a controllable segmented pressure relief method in a freezing construction method, which uses the controllable segmented pressure relief device in the freezing construction method, and includes the following steps:

[0035] Arranging a settlement monitoring point on the ground surface to monitor the ground surface settlement during the freezing construction method;

[0036] Laying a pressure relief hole, and installing a combined pressure relief pipe in the pressure relief hole to relieve pressure;

[0037] According to the monitoring quantity of the ground uplift, the corresponding stratum position of the ground where the monitoring quantity is greater than the early warning value is found, the inner cylinder of the combined pressure relief pipe at the corresponding position in the mud discharge hole is rotated by operating the wrench, so that the inner mud discharge hole 6 in the combined pressure relief pipe is aligned with the outer mud discharge hole 2, and the mud discharge hole is opened; the inner cylinder of the combined pressure relief pipe at the corresponding position in the mud discharge hole is rotated by operating the wrench, so that the inner mud discharge hole 6 in the combined pressure relief pipe is completely misaligned with the outer mud discharge hole 2, and the mud discharge hole is closed.

[0038] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the patent application claims.

Claims

1. A method of controlled staged pressure relief in a freeze construction, characterized in that, Controllable segmented pressure relief is performed by using a controllable segmented pressure relief device, The controllable segmented pressure relief device comprises a combined pressure relief pipe, a drill bit (12) and an operating wrench, a plurality of the combined pressure relief pipes are spliced together for use, and the drill bit (12) is installed at the front end of the combined pressure relief pipe after splicing; a single combined pressure relief pipe comprises a pressure relief fluted pipe (1) arranged outside and an inner pipe closely attached to the inner wall of the pressure relief fluted pipe (1), and the inner pipe can rotate in the pressure relief fluted pipe (1); a plurality of outer mud discharge holes (2) are arranged on the peripheral wall of the pressure relief fluted pipe (1) at intervals, the inner pipe is provided with inner mud discharge holes (6) corresponding to the outer mud discharge holes (2) one by one on the peripheral wall, and the inner wall of the inner pipe is fixedly provided with an inner wrenching plate (5); the operating wrench can be inserted into the inner pipe and drive the inner pipe to rotate along the circumferential direction of the pressure relief fluted pipe (1) by pushing the inner wrenching plate (5), so that the inner mud discharge holes (6) are aligned with or completely staggered with the outer mud discharge holes (2); the inner mud discharge holes (6) are aligned with the outer mud discharge holes (2) to open the mud discharge channel, and the inner mud discharge holes (6) are completely staggered with the outer mud discharge holes (2) to close the mud discharge channel; After a spliced combined pressure relief pipe is inserted into the stratum, the rotation of the inner pipe is controlled by the operating wrench to realize the opening and closing of the mud discharge channel, so that the strata at multiple depths / drilling depths are relieved. The method comprises the following steps: Arranging a settlement monitoring point on the ground surface to monitor the ground surface settlement during the freezing construction; Laying a pressure relief hole and installing a combined pressure relief pipe in the pressure relief hole for pressure relief; According to the monitoring amount of the ground surface uplift, the inner cylinder of the combined pressure relief pipe at the corresponding position in the mud discharge hole is rotated by the operating wrench at the stratum position corresponding to the monitoring amount greater than the early warning value, so that the inner mud discharge holes (6) in the combined pressure relief pipe are aligned with the outer mud discharge holes (2) to open the mud discharge channel; the inner cylinder of the combined pressure relief pipe at the corresponding position in the mud discharge hole is rotated by the operating wrench, so that the inner mud discharge holes (6) in the combined pressure relief pipe are completely staggered with the outer mud discharge holes (2) to close the mud discharge channel.

2. The method according to claim 1, wherein, The inner pipe comprises a rotating cylinder (4) and a rubber pad (3) fixed to the outer periphery of the rotating cylinder (4), and the rubber pad (3) is closely attached to the inner wall of the pressure relief fluted pipe (1).

3. The method according to claim 1, wherein, The length of the inner pipe is less than the length of the pressure relief fluted pipe (1), and the inner wall of the pressure relief fluted pipe (1) is fixedly provided with a stop ring (8) for limiting the inner pipe at both ends.

4. The method according to claim 1, wherein, The number of the inner wrenching plates (5) is one or more, the operating wrench comprises an operating rod (9) with an outer diameter smaller than the inner diameter of the inner pipe and an outer wrenching plate (7) protruding and fixed to one end of the peripheral surface of the operating rod (9), and there is a spacing space between the adjacent two inner wrenching plates (5) to allow the outer wrenching plate (7) to extend in.

5. The method according to claim 4, wherein, The number of the inner wrenching plates (5) and the outer wrenching plates (7) is two, and the inner wrenching plates (5) and the outer wrenching plates (7) are evenly arranged.

6. The method according to claim 4, wherein, The length of the single joint of the combined pressure relief pipe is 1.5-2.0 m, the length of the outer mud hole (2) accounts for 50%-80% of the length of the combined pressure relief pipe, and the corresponding central angle of the single outer mud hole (2) is 15°-135°; the length of the inner toggle plate (5) is 5-10 cm, and the radial height of the inner toggle plate (5) is 1.0-1.5 cm; the inner diameter of the pressure relief flower pipe (1) is 80-100 mm, the inner diameter of the inner pipe is 65-90 mm, and the outer diameter of the operating rod (9) is less than 40 mm.

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