Construction method of long-distance two-way drilling connecting passage freezing hole

Abstract

The application discloses a long-distance bidirectional drilling connecting channel freezing hole construction method and belongs to the technical field of freezing hole construction, and comprises the following steps: two tunnels are defined as a left tunnel and a right tunnel; a connecting channel between the two tunnels is designed with multiple rows of freezing holes around the connecting channel; the freezing holes are divided into multiple calculation units before bidirectional drilling construction; first, drilling work of the left freezing holes in a first calculation unit is completed; an inclinometer is used to incline the left freezing holes in the first calculation unit to determine the coordinate position of the left freezing holes on the middle section of the lap joint section; drilling parameters of the right freezing holes are calculated and determined, and the right freezing holes are constructed; before the right freezing holes are drilled to the lap joint section, deflection measurement is performed, so that the left freezing holes and the right freezing holes are more reasonably distributed in the lap joint section; and then, left drilling and remaining right drilling of the remaining calculation units are continuously performed. Through step-by-step control, multiple measurement and sequential construction in the drilling process, the collision phenomenon of the freezing pipes in construction is reduced, and the engineering safety is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground freezing pipe construction, and particularly relates to a long-distance bidirectional drilling connecting passage freezing hole construction method. BACKGROUND

[0002] The artificial freezing method is one of the most important stratum reinforcement methods for the construction of a metro connecting passage, and has been applied to metro engineering in most cities in China. However, with the deepening of the development and utilization of urban underground space, the burial depth of more and more newly-built metro engineering is increasing, and the upper soil thickness of the connecting passage is also increasing because the connecting passage is generally located at the lower section of the metro tunnel. With this trend, in order to form a freezing wall with sufficient bearing capacity, more and more connecting passage freezing engineering begins to use the double-row pipe freezing arrangement to improve the thickness of the freezing wall. However, in the long-distance and large-burial-depth connecting passage, the arrangement of the bidirectional double-row freezing holes makes it easy for many freezing holes to collide with each other during construction. Once the freezing holes collide with each other, the welding area inside the freezing pipe is easily damaged, forming a leakage point. If not discovered and treated in time, salt water will inevitably leak during the freezing process, causing great engineering risks. Therefore, it is necessary to develop a construction method that can effectively avoid the collision of freezing pipes and take measures after the collision to improve the safety of the engineering. SUMMARY

[0003] The purpose of the present application is to provide a long-distance bidirectional drilling connecting passage freezing hole construction method, which aims to solve the technical problem of frequent collision of two-end freezing holes in the construction of the connecting passage freezing hole in the prior art.

[0004] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0005] A long-distance bidirectional drilling connecting passage freezing hole construction method, comprising the following steps:

[0006] Step 1: According to the design drawing of the connecting passage, define the two tunnels connected by the connecting passage as the left-line tunnel and the right-line tunnel, and design multiple freezing holes around the connecting passage, wherein the freezing holes constructed in the left-line tunnel are set as left-line freezing holes, the freezing holes constructed in the right-line tunnel are set as right-line freezing holes, and the left-line freezing holes and the right-line freezing holes are arranged alternately;

[0007] Step 2: The left-line freezing holes and the right-line freezing holes are staggered; set the bidirectional drilling coexistence area along the connecting passage direction as a drilling overlap section, and define the middle section of the drilling overlap section as a middle control section; in the left-line tunnel, divide the left-line freezing holes around the connecting passage into four areas according to up, down, left and right, and divide the freezing holes in the four areas into multiple calculation units according to the following rules:

[0008] Four left line frozen holes and two right line frozen holes are a calculation unit, the four left line frozen holes include two upper and lower adjacent left line frozen holes and two left line frozen holes adjacent to the left or right of the two left line frozen holes, and the two right line frozen holes are arranged in the position defined by the four left line frozen holes; the four surrounding areas of the connecting channel are divided into n calculation units;

[0009] Step 3: Starting with any one of the calculation units surrounding the connecting channel as the first calculation unit, drilling of the two rows of left line frozen holes in the first calculation unit is completed according to the hole positions on the connecting channel design drawing;

[0010] Step 4: The two rows of left line frozen holes in the first calculation unit are measured by the inclinometer to determine the coordinate positions thereof on the intermediate control section, denoted as (xi, yi), wherein i is the number of the frozen hole;

[0011] Step 5: The coordinate positions of the right line frozen holes on the intermediate control section are solved by using the coordinates of the left line frozen holes in step 4, and the solved coordinates are as follows:

[0012]

[0013] In the formula, is the row spacing of the vertical two rows of right line frozen holes on the design drawing;

[0014] x yx1 - X-direction coordinate of the first frozen hole drilled from the right line tunnel to the left line tunnel;

[0015] x yx2 - X-direction coordinate of the second frozen hole drilled from the right line tunnel to the left line tunnel;

[0016] y yx1 - Y-direction coordinate of the first frozen hole drilled from the right line tunnel to the left line tunnel;

[0017] y yx2 - Y-direction coordinate of the second frozen hole drilled from the right line tunnel to the left line tunnel;

[0018] Step 6: The vertical inclination and horizontal deflection angle of the frozen hole are calculated by using the projection coordinates of the right line frozen hole obtained in step 5 and the hole positions on the design drawing;

[0019] Step 7: The right line frozen hole is drilled according to the calculated drilling parameters, and the deflection is measured before the drilling hole enters the lap joint section;

[0020] Step 8: After the first calculation unit is completed, the left line frozen hole drilling and the right line frozen hole drilling of the remaining calculation units are sequentially performed according to the order of steps 3-step 7;

[0021] Step 9: If the right line frozen hole and the left line frozen hole collide with the frozen pipe during the drilling process, the frozen pipe rapid detection device is used for pressure test and leakage analysis to analyze the impact of the collision.

[0022] Preferably, in the right line frozen hole deflection measurement in step 7, if there is a large deviation between the right line frozen hole drilling deflection and the calculated value, the deviation is corrected, otherwise the drilling continues to the designed depth.

[0023] Preferably, the frozen pipe rapid detection device for pressure test and leakage includes a pressure cavity and a pressure hose, the pressure cavity is connected with a pressure gauge, the pressure hose is connected with the pressure cavity and the frozen pipe through a connecting piece, and the pressure cavity is provided with an exhaust valve and an air inlet valve connected with an air pump.

[0024] Preferably, the connecting piece is a plurality of collars, and the pressure cavity is made of low-carbon seamless steel pipe.

[0025] The beneficial effects of the above technical solution are that, compared with the prior art, the anti-collision hole construction method of step-by-step control, multiple measurement and sequential construction during drilling can greatly reduce the collision of frozen pipes during drilling construction, and once the frozen pipes collide, the frozen pipe rapid detection device is used for rapid inspection to determine whether to make up for it. The present application can avoid the frequent collision of the two end frozen pipes in the frozen hole construction, and improve the engineering safety. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0027] Figure 1 is a drilling schematic diagram between the left line tunnel and the right line tunnel in an embodiment of the present application;

[0028] Figure 2 is Figure 1 is a design schematic diagram of the left line frozen holes around the left line tunnel in the contact passage;

[0029] Figure 3 is a distribution schematic diagram of bidirectional drilling on the middle control section of the drilling lap section in the embodiment of the present application;

[0030] Figure 4 is a structure schematic diagram of a frozen pipe rapid detection device used in a long-distance bidirectional drilling contact passage frozen hole construction method provided by the embodiment of the present application;

[0031] In the figure: 00-connection passage; 1-left line tunnel, 2-right line tunnel, 3-left line freezing hole, 4-right line freezing hole, 5-intermediate control section, 6-first calculation unit, 7-second calculation unit, 8-pressure gauge, 9-pressing cavity, 10-first throat clamp, 11-second throat clamp, 12-pressure hose, 13-exhaust valve, 14-inlet valve. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0033] The present application provides a long-distance two-way drilling connection passage freezing hole construction method, comprising the following steps:

[0034] Step 1: according to the connection passage design drawing, define the two tunnels connected by the connection passage 00 as the left line tunnel 1 and the right line tunnel 2, design multiple freezing holes around the connection passage 00, wherein the freezing holes constructed in the left line tunnel 1 are set as the left line freezing hole 3, the freezing holes constructed in the right line tunnel 2 are set as the right line freezing hole 4, and the left line freezing hole 3 and the right line freezing hole 4 are arranged in a staggered manner, as shown in Figure 1 、 2 .

[0035] As a preferred scheme, as shown in Figure 3 , the left line freezing hole 3 and the right line freezing hole 4 are arranged in a plum blossom shape at the intermediate control section 5 of the drilling overlap section.

[0036] Step 2: the left line freezing hole 3 and the right line freezing hole 4 are staggered; set the two-way drilling coexistence area as the drilling overlap section, and define the middle section of the drilling overlap section as the intermediate control section 5; in the left line tunnel 1, set the left line freezing holes 3 around the connection passage 00 into four areas according to up, down, left and right, and divide the freezing holes in the four areas into multiple calculation units, which are set according to the following rules:

[0037] The four freezing holes adjacent to each other in up, down, left and right of the left line freezing hole 3 and the two right line freezing holes 4 located in the position defined by the four left line freezing holes 3 are a calculation unit, and the area around the connection passage 00 is divided into n calculation units;

[0038] Step 3: set any one calculation unit around the connection passage 00 as the first calculation unit 6, and complete the drilling work of the two rows of left line freezing holes 3 in the first calculation unit 6 according to the drilling position on the connection passage design drawing;

[0039] Step 4: Use the clinometer to measure the inclination of the two rows of left line frozen holes 3 in the first calculation unit 6, and determine their coordinate positions on the intermediate control section, denoted as (xi, yi), where i is the number of the frozen hole;

[0040] Step 5: Use the coordinates of the left line frozen holes 3 in Step 4 to solve the projection coordinates of the right line frozen holes 4 on the intermediate control section, and the solving coordinates are as follows:

[0041]

[0042] wherein, is the row spacing of the right line frozen holes perpendicular to the two rows in the design drawing;

[0043] x yx1 - X-direction coordinate of the first frozen hole drilled from the right line tunnel to the left line tunnel;

[0044] x yx2 - X-direction coordinate of the second frozen hole drilled from the right line tunnel to the left line tunnel;

[0045] y yx1 - Y-direction coordinate of the first frozen hole drilled from the right line tunnel to the left line tunnel;

[0046] y yx2 - Y-direction coordinate of the second frozen hole drilled from the right line tunnel to the left line tunnel;

[0047] Step 6: Use the projection coordinates of the right line frozen holes 4 obtained in Step 5 and the hole opening position on the design drawing to calculate the vertical inclination and horizontal deflection angle of the drilling of the frozen hole;

[0048] Step 7: According to the calculated drilling parameters, drill the right line frozen hole 4 until it enters the overlap section, and measure the deflection. If there is a large deviation between the drilling deflection of the right line frozen hole 4 and the calculated value, correct the deviation, otherwise continue drilling to the designed depth;

[0049] Step 8: After the completion of the first calculation unit 6, sequentially perform the drilling of the left line frozen hole and the drilling of the right line frozen hole of the second calculation unit 7 next to it or the calculation unit in other areas according to the order of Steps 3-7;

[0050] Step 9: If the right line frozen hole 4 collides with the frozen tube of the left line frozen hole 3 during drilling, use the frozen tube rapid detection device to detect the leakage by pressing, and analyze the impact of the collision.

[0051] AsFigure 4 As shown, the frozen pipe rapid detection device includes a press cavity 9 and a pressure-resistant hose 12, the press cavity 9 is communicated with a pressure gauge 8, the pressure-resistant hose 12 is connected with the press cavity 9 and the frozen pipe through a connecting piece, the press cavity 9 is provided with an exhaust valve 13 and an air inlet valve 14 which can be connected with an air pump. The frozen pipe rapid detection device with the structure can realize quick press without welding and quick connection of the frozen pipe, and can not cause water accumulation in the frozen pipe due to air pressure construction, so as not to affect subsequent inclination measurement.

[0052] In specific production, the connecting piece is a plurality of ferrules, and the press cavity 9 is made of low-carbon seamless steel pipe. The pressure-resistant hose 12 is connected with the press cavity 9 through a first ferrule 10 and connected with the frozen pipe through a second ferrule 11. The specific design size is as follows:

[0053] The press cavity 9 made of low-carbon seamless steel pipe is a φ89mm×8mm cylinder with a length of 10cm, one end of the press cavity 9 is blocked and provided with a pressure gauge 8 for observing the press pressure. The press cavity 9 is tightly connected with the pressure-resistant hose 12 with an inner diameter of 90mm and a length of 15cm through the first ferrule 10. In addition, two bypass pipes are welded on the press cavity, and the exhaust valve 13 and the air inlet valve 14 are installed for exhausting and connecting the press air pump respectively. Meanwhile, a plurality of second ferrules 11 are installed at the end of the pressure-resistant hose 12 for tightly connecting the end with the frozen pipe (default 89×8mm specification).

[0054] In the press leakage test process, the specific operation steps of the frozen pipe rapid detection device are as follows:

[0055] Step 1: The frozen pipe is collided or suspected to have dew point.

[0056] Step 2: The pressure-resistant hose 12 is butt-jointed with the frozen pipe, the butt-jointed length is not less than 5cm. The second ferrule 11 is tightened to tightly connect the pressure-resistant hose 12 and the frozen pipe.

[0057] Step 3: The exhaust valve 13 is closed, the air inlet valve 14 is opened and connected with the external press air pump.

[0058] Step 4: The air is supplied to the inside of the press cavity 9, and the press is stopped when the pressure value reaches 0.8MPa or above, and the pressure gauge 8 is observed for 45min. If the pressure of the pressure gauge decreases by not more than 0.05MPa in the first 15min and no pressure changes in the last 30min, it is considered that the press is qualified without leakage point, otherwise it is considered that there is a leakage point.

[0059] Step 4: After the test, the air inlet valve 14 is closed, the exhaust valve 13 is opened, the second ferrule 11 is loosened after the air pressure in the press cavity 9 is consistent with the outside, and the frozen pipe rapid detection device is removed.

[0060] In summary, the application has the advantages of simple construction process and convenient and fast operation. The freezing pipe anti-collision construction method of step-by-step control, multiple measurement and sequential construction can greatly reduce the collision problem in drilling construction and improve the engineering safety. Once the freezing pipe collides, the rapid detection device is used for rapid inspection, timely measures are taken for remediation, the construction is ensured to proceed smoothly, and the engineering quality is improved.

[0061] In the above description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond that which is described herein without departing from the scope of the present application. Accordingly, the present application is not limited to the specific embodiments described above, but only by the claims.

Claims

1. A method for constructing freezing holes for long-distance bidirectional borehole connecting passages, characterized in that, Includes the following steps: Step 1: According to the design drawings of the connecting passage, the two subway tunnels connected by the connecting passage are defined as the left tunnel and the right tunnel. Multiple freezing holes are designed around the connecting passage. The freezing holes constructed in the left tunnel are designated as left line freezing holes, and the freezing holes constructed in the right tunnel are designated as right line freezing holes. The left line freezing holes and the right line freezing holes are arranged alternately. Step 2: The left-line and right-line freezing holes are staggered; the area where bidirectional drilling coexists along the connecting passage is defined as the drilling overlap section, and the middle section of the drilling overlap section is defined as the intermediate control section; within the left-line tunnel, the left-line freezing holes around the connecting passage are divided into four regions according to top, bottom, left, and right, and the freezing holes within the four regions are divided into multiple calculation units, set according to the following rules: Four left-line freezing holes and two right-line freezing holes constitute a calculation unit. The four left-line freezing holes include two vertically adjacent left-line freezing holes and two corresponding left-line freezing holes on their left or right sides. The two right-line freezing holes are located within the positions defined by the four left-line freezing holes. The perimeter of the communication channel is divided into n calculation units. Step 3: Start with any one of the calculation units around the connecting channel as the first calculation unit, and complete the drilling of the two rows of left-line freezing holes in the first calculation unit according to the drilling positions on the connecting channel design drawings. Step 4: Use an inclinometer to measure the inclinometer of the two rows of left-line freezing holes in the first calculation unit to determine their coordinate positions on the middle control section, denoted as (xi, yi), where i is the number of the freezing hole; Step 5: Using the coordinates of the left-line freezing hole from Step 4, solve for the projected coordinates of the right-line freezing hole on the intermediate control section. The solved coordinates are as follows: ； In the formula, The row spacing between the two vertical rows of freezing holes on the right line in the design drawing; x yx1 -X-direction coordinates of the first freezing hole drilled from the right tunnel to the left tunnel; x yx2 -X-direction coordinates of the second freezing hole drilled from the right tunnel to the left tunnel; y yx1 - Y-coordinate of the first freezing hole drilled from the right tunnel to the left tunnel; y yx2 - Y-coordinate of the second freezing hole drilled from the right tunnel to the left tunnel; Step 6: Using the projected coordinates of the right-line freezing hole obtained in Step 5 and the opening position on the design drawing, calculate the vertical inclination angle and horizontal deflection angle of the freezing hole. Step 7: Drill the right-line freezing hole according to the calculated drilling parameters, and measure the deviation before entering the overlapping section; Step 8: After the first calculation unit is completed, drill the left-line freezing holes and the right-line freezing holes of the remaining calculation units in the order of Steps 3-7. Step 9: If the freezing pipes of the right-line freezing hole and the left-line freezing hole collide during the drilling process, a rapid freezing pipe detection device should be used to pressure test for leaks and analyze the impact of the collision.

2. The method for constructing freezing holes for long-distance bidirectional borehole connecting passages according to claim 1, characterized in that: In step 7, during the measurement of the deviation of the right-line freezing hole, if there is a large deviation between the drilling deviation of the right-line freezing hole and the calculated value, correction shall be performed; otherwise, drilling shall continue to the designed depth.

3. The method for constructing freezing holes for long-distance bidirectional borehole connecting passages according to claim 1, characterized in that: Pressure test for leaks on the frozen pipes that have been drilled or are being drilled.

4. The method for constructing freezing holes for long-distance bidirectional drilling connecting channels according to claim 3, characterized in that: A rapid testing device for frozen pipes is used for pressure testing and leak detection. The rapid testing device for frozen pipes includes a pressure testing chamber and a pressure-resistant hose. The pressure testing chamber is connected to a pressure gauge. The pressure-resistant hose is connected to the pressure testing chamber and the frozen pipe through a connector. The pressure testing chamber is equipped with an exhaust valve and an air inlet valve that can be connected to an air pump.

5. The method for constructing freezing holes for long-distance bidirectional borehole connecting passages according to claim 4, characterized in that: The connector consists of multiple hose clamps, and the pressure chamber is made of low-carbon seamless steel pipe.

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