Retractable recyclable octagonal cone head device for biogas static pressure discharge and operation method

Abstract

A retractable and recyclable octagonal cone head device for static pressure discharge of biogas comprises an outer tube sleeve, an inner core cone, a No. 1 pipe segment, a No. 2 pipe segment, an upper expansion piece and a lower expansion piece, the upper part of the outer tube sleeve is fixedly connected to the lower end of the probe rod, the lower part of the outer tube sleeve is connected to the inner end of the No. 1 pipe segment through a right-angle lock, the upper part of the inner core cone extends into the inner cavity of the outer tube sleeve, the upper end of the inner core cone barrel is inserted into the U-shaped buckle on the inner wall of the outer tube sleeve, the lower end of the inner core cone barrel is a cone tip, the outer wall of the inner core cone barrel above the cone tip is connected to the lower end of the No. 2 pipe segment through a half-angle lock, the outer end of the No. 1 pipe segment and the upper end of the No. 2 pipe segment are both connected to a fixing member, the upper expansion piece is installed in the upper expansion slot of the No. 1 pipe segment, and the lower expansion piece is installed in the lower expansion slot of the No. 2 pipe segment. And an operation method of a retractable and recyclable octagonal cone head device for static pressure discharge of biogas is provided. The invention has the advantages of short construction period, convenient operation, low cost and good subsequent exhaust effect.

Description

Technical Field

[0001] The invention relates to a retractable and recyclable octagonal cone head device for static pressure discharge of biogas in soft soil areas and an operation method thereof, which is suitable for biogas discharge in subway construction and belongs to the technical field of subway construction. Background Art

[0002] For the construction of the subway project to be built, the method of pre-exhaust is adopted to reduce the many adverse effects of underground biogas on the later construction. When constructing in soft soil areas, underground biogas usually adopts the static pressure discharge method, that is, the biogas is discharged by static pressure and pulling up the probe rod. A disposable cone head is installed at the lower end of the probe rod to increase the pressure at the rod end, so that the probe rod can smoothly enter the designed discharge depth. When the biogas rises along the inside of the probe rod through the pressure difference, various valves, sedimentation tanks (gas-liquid separators), pressure gauges and flow meters are connected to the probe rod mouth to test the biogas pressure and flow. Conventional static pressure biogas discharge construction needs to meet the exhaust work of multiple holes in the way of "one hole, one cone head". The unrecyclable legacy cone heads also have the risk of damaging the shield equipment. The hole layout range often needs to be kept within 3 to 5 meters outside the tunnel structure line. The limitations of its layout can easily cause incomplete discharge of biogas, affecting the stability of the tunnel structure and the safety of the crew.

[0003] The disposable and non-recyclable cone heads used in the existing biogas static pressure emission construction in soft soil areas increase the construction difficulty, often increasing the construction cost and affecting the construction quality. Summary of the invention

[0004] In order to overcome the shortcomings of the existing biogas emission cone head device in subway construction in soft soil areas, such as high cost, long construction period, and poor subsequent exhaust effect, the present invention provides a retractable and recyclable octagonal cone head device and operation method for biogas static pressure emission in soft soil areas, which can effectively overcome the shortcomings of conventional cone head devices and operation methods used in the above-mentioned biogas emission. The device can not only realize the effective recovery and recycling of biogas emission cone heads, but also has a short construction period, convenient operation, low cost, and good subsequent exhaust effect.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A retractable and recyclable octagonal cone head device for static pressure discharge of biogas, comprising an outer tube sleeve, an inner core tube cone, a No. 1 pipe segment, a No. 2 pipe segment, an upper expansion piece and a lower expansion piece, the upper part of the outer tube sleeve is fixedly connected to the lower end of the probe rod, the lower part of the outer tube sleeve is connected to the inner end of the No. 1 pipe segment through a right-angle lock, the upper part of the inner core cone tube extends into the inner cavity of the outer tube sleeve, the upper end of the inner core cone barrel is inserted into the U-shaped buckle on the inner wall of the outer tube sleeve, the lower end of the inner core cone barrel is a cone tip, the outer wall of the inner core cone barrel above the cone tip is connected to the lower end of the No. 2 pipe segment through a half-angle lock, the outer end of the No. 1 pipe segment and the upper end of the No. 2 pipe segment are both connected to the fixing piece, the upper expansion piece is installed in the upper expansion slot of the No. 1 pipe segment, and the lower expansion piece is installed in the lower expansion slot of the No. 2 pipe segment.

[0007] Furthermore, the U-shaped buckle is welded to the inner wall of the outer tube sleeve.

[0008] The No. 1 pipe segment and the No. 2 pipe segment are connected and fixed by T-shaped fasteners.

[0009] Furthermore, the upper portion of the outer tube sleeve is threadedly connected to the lower end portion of the probe rod.

[0010] Preferably, the upper end of the inner core cone barrel is snap-connected to the inner cavity of the outer tube sleeve.

[0011] An operating method of a retractable and recyclable octagonal cone head device for biogas static pressure discharge comprises the following steps:

[0012] (a) According to the soil conditions and depth of the construction section of the site, the static pressure method of biogas treatment is selected, and the downward pressure cone head device adopts a retractable and recyclable octagonal cone head device for biogas static pressure discharge, and the exhaust depth is set according to the depth of the biogas generation layer and the gas storage layer;

[0013] (b) Hole location arrangement: According to the distribution of methane in the shield tunneling area, the locations of methane emission holes should be measured and marked in advance;

[0014] (c) Anchors are placed at the hole locations as static counter-pressure devices;

[0015] (d) Rotate the No. 1 segment clockwise to 90° perpendicular to the outer tube casing wall, and then install the upper expansion piece into the No. 1 segment along the upper expansion slot;

[0016] (e) When the No. 2 pipe segment is rotated counterclockwise to 45°, the lower expansion piece is installed into the No. 2 pipe segment along the lower expansion slot;

[0017] (f) Insert the No. 1 segment and the No. 2 segment into the fixings and fix them together with T-shaped fasteners;

[0018] (g) Press the inner core cone into the U-shaped buckle and connect it to the outer tube sleeve;

[0019] (h) Install the device installed in step (g) above to the lower end of the probe rod by bolting the outer tube sleeve;

[0020] (i) The probe with a retractable and retractable cone head is pressed into the corresponding soil layer through a static pressure device to complete the measurement of biogas pressure and flow and exhaust. When the biogas pressure is discharged to a value less than the designed engineering safety value, the exhaust is stopped and the probe is lifted to the next designated exhaust soil layer depth for biogas exhaust;

[0021] (j) After all tests and exhaust work are completed, pull all remaining probes off the ground at a uniform speed and remove the cone head device from the lower end of the probe;

[0022] (k) Remove the T-shaped fastener and the fixing piece from the cone head device one by one;

[0023] (l) taking out the upper expansion sheet and the lower expansion sheet from the No. 1 pipe segment and the No. 2 pipe segment successively;

[0024] (m) Rotate the No. 1 segment and the No. 2 segment until they fit closely to the pipe wall;

[0025] (n) recovering the components of the cone head device and sealing the biogas discharge hole;

[0026] (o) Repeat steps (c) to (n) to complete the methane emission from all the holes in step (b).

[0027] In the step (b), the holes are arranged in a plum blossom shape.

[0028] In the step (c), for the section where it is impossible to install a ground anchor, a crawler-type static pressure device can be used to utilize its own weight or add a counterweight as a reaction force device, and then a double-cylinder full hydraulic transmission device can be installed.

[0029] The beneficial effects of the present invention are mainly manifested in:

[0030] 1) Simple operation and short construction period. The retractable cone head design not only meets the requirement of the biogas probe rod to quickly pass through the soft soil layer, but also reduces the lateral resistance caused by the cone head when the probe rod is pulled up, ensuring the rapid pulling up of the rod, reducing the construction difficulty and saving the construction period.

[0031] 2) Low cost. Due to the use of a shrinking recycling method, the cone head is transformed from a disposable component into a recyclable component that can be recycled, reducing the cost of the cone head and saving exhaust costs.

[0032] 3) No obstacles left behind, making shield construction easier in the later stages. Conventional non-recyclable cone heads will leave cone obstacles in the soil. In subsequent shield construction, the existence of cone obstacles will not only damage the shield cutterhead but also extend the construction period, resulting in huge economic losses. The retractable recyclable cone head device can solve the problem of obstacles left in the soil layer, making shield construction easier in the later stages.

[0033] 4) The biogas discharge holes can be arranged flexibly, and the exhaust effect is good. Due to the existence of obstacles of conventional non-recyclable cone heads, conventional biogas discharge holes can only be arranged outside the shield construction area, and cannot be arranged according to the actual burial position and depth of biogas, making the exhaust effect of relying solely on the exhaust holes outside the construction area unsatisfactory, which is easy to cause safety accidents such as biogas fires during construction. The retractable recyclable cone head can flexibly arrange the discharge holes according to the burial position and depth of biogas, breaking through the limitation that the discharge holes can only be arranged outside the shield construction area in the original construction, making the biogas discharge more thorough and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a cross-sectional view of a retractable and recyclable octagonal cone head device for static pressure discharge of biogas in soft soil areas.

[0035] Figure 2 It is a front view of a retractable and recyclable octagonal cone head device for static pressure discharge of biogas in soft soil areas.

[0036] Figure 3 It is a top view of a retractable and recyclable octagonal cone head device for static pressure discharge of biogas in soft soil areas.

[0037] Figure 4 This is a schematic diagram of segment No. 1.

[0038] Figure 5 This is a schematic diagram of segment No. 2.

[0039] Figure 6 is a schematic diagram of the fixings.

[0040] Figure 7 It is a schematic diagram of a U-shaped buckle.

[0041] Figure 8 It is a cross-sectional view of the end of the expansion piece.

[0042] Among them, 1. U-shaped buckle; 2. right-angle lock; 3. fixing piece; 4. half-angle lock; 5. outer tube sleeve; 6. inner core tube cone; 7. No. 1 pipe segment; 8. T-shaped fastener; 9. No. 2 pipe segment; 10. upper telescopic slot; 11. upper telescopic piece; 12. lower telescopic slot; 13. lower telescopic piece; 14. lower end of the probe rod. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] Reference Figures 1 to 8 A retractable and recyclable octagonal cone head device for static pressure discharge of biogas, comprising an outer tube sleeve 5, an inner core tube cone 6, a No. 1 pipe segment 7, a No. 2 pipe segment 9, an upper telescopic piece 11 and a lower telescopic piece 13, the upper part of the outer tube sleeve 5 is fixedly connected to the lower end 14 of the probe rod, the lower part of the outer tube sleeve 5 is connected to the inner end of the No. 1 pipe segment 7 through a right-angle lock buckle 2, the upper part of the inner core cone 6 extends into the inner cavity of the outer tube sleeve 5, and the inner core cone barrel 6 The upper end is inserted into the U-shaped buckle 1 on the inner wall of the outer tube sleeve, the lower end of the inner core cone barrel 6 is a cone tip, and the outer wall of the inner core cone barrel above the cone tip is connected to the lower end of the No. 2 pipe segment 9 through a half-angle lock buckle 4, the outer end of the No. 1 pipe segment 7 and the upper end of the No. 2 pipe segment 9 are both connected to the fixing part 3, the upper telescopic plate 11 is installed in the upper telescopic slot 10 of the No. 1 pipe segment 7, and the lower telescopic plate 13 is installed in the lower telescopic slot 12 of the No. 2 pipe segment.

[0045] Furthermore, the U-shaped buckle 1 is welded to the inner wall of the outer tube sleeve 5 .

[0046] The No. 1 pipe segment 7 and the No. 2 pipe segment 7 are connected and fixed by a T-shaped fastener 8.

[0047] Furthermore, the upper portion of the outer tube sleeve 5 is threadedly connected to the lower end portion 14 of the probe rod.

[0048] Preferably, the upper end of the inner core cone barrel 6 is snap-connected to the inner cavity of the outer tube sleeve 5 .

[0049] In the underground soil layer of a subway construction area, both the ⑥2 muddy silty clay and the ⑧2 layers of silty clay have a large amount of biogas with high air pressure. In order to ensure the safety of the project construction, biogas emission is required. In order to obtain the burial situation of biogas in the underground soil layer and biogas emission, the disposable conventional cone head can only arrange the biogas emission hole within 3-5m outside the tunnel structure line. The retractable and recyclable octagonal cone head device for static pressure emission of biogas in soft soil areas of the present invention can not only realize the rapid descent of the cone head to the set depth, but also realize the recycling of the cone head, which greatly reduces the construction cost, speeds up the construction progress, and ensures the safety of shield construction. The biogas emission hole exposes the gas-bearing layer with the minimum diameter, and passes through the gas-generating layer and the gas storage layer. The hole depth should expose the ⑥2 muddy silty clay and enter the ⑧2 layers of silty clay to a certain depth. The single hole is designed to have a hole depth of 45m.

[0050] This biogas treatment and emission construction adopts XY-100 drilling rig-assisted hole-guiding combined with static pressure emission equipment. Since the biogas content of this project is large and the area is wide, the use of the disposable conventional cone head of the original static pressure emission equipment is not only costly and time-consuming, but also has obstacles left and poor exhaust effect. The use of a retractable recyclable cone head device can achieve recycling, which has the advantages of low cost, short construction period, convenient subsequent construction and good exhaust effect.

[0051] The embodiments of the present invention are:

[0052] (p) According to the soil conditions and depth of the construction section of the site, the static pressure method of biogas treatment was selected. The downward pressure cone head device adopted a retractable and recyclable octagonal cone head device used for static pressure discharge of biogas in soft soil areas. The exhaust depth was set to 45m according to the depth of the biogas generation layer and the gas storage layer.

[0053] (q) Hole layout: The positions of biogas emission holes are measured and marked in advance according to the biogas distribution in the shield tunnel section, and the hole layout is arranged in a plum blossom shape.

[0054] (r) Ground anchors are installed at the hole layout locations as static counter-pressure devices. For sections where ground anchors cannot be installed, crawler-type static pressure equipment can be used to use its own weight or add counterweights as a counter-force device, and then double-cylinder full hydraulic transmission equipment can be installed.

[0055] (s) Rotate the No. 1 pipe segment 7 clockwise to 90° perpendicular to the wall of the outer tube sleeve 5, and then install the upper expansion piece 11 into the No. 1 pipe segment 7 along the upper expansion slot 10.

[0056] (t) When the No. 2 pipe segment 9 is rotated counterclockwise to 45°, the lower telescopic piece 13 is installed into the No. 2 pipe segment 9 along the lower telescopic slot 12.

[0057] (u) Insert pipe segment No. 1 7 and pipe segment No. 2 9 into the fixing member 3 and connect and fix them together via T-shaped fasteners 8.

[0058] (v) Press the inner core cone 6 into the U-shaped buckle 1 to connect it with the outer tube sleeve 5.

[0059] (w) The device installed in step (g) above is mounted to the lower end 14 of the probe rod by bolting the outer tube sleeve 5;

[0060] (x) The probe with a retractable and retractable cone head is pressed into the corresponding soil layer through a static pressure device to complete the biogas pressure, flow measurement and exhaust. When the biogas pressure is discharged to a value less than the designed engineering safety value, the exhaust is stopped and the probe is lifted to the next designated exhaust soil layer depth for biogas discharge.

[0061] (y) After all tests and exhaust construction are completed, all remaining probes are pulled out of the ground at a uniform speed, and the cone head device is removed from the lower end 14 of the probe.

[0062] (z) Remove the T-shaped fastener 8 and the fixing member 3 from the cone head device one after another.

[0063] (aa) The upper expansion sheet 11 and the lower expansion sheet 13 are successively taken out from the No. 1 pipe segment 7 and the No. 2 pipe segment 9.

[0064] (bb) Rotate the No. 1 pipe segment 7 and the No. 2 pipe segment 9 until they fit closely to the pipe wall.

[0065] (cc) Recover the components of the cone head device and seal the biogas discharge hole.

[0066] (dd) Repeat steps (c) to (n) to complete the methane emission from all the holes in step (b).

Claims

1. A retractable and recyclable octagonal cone head device for biogas static pressure discharge, characterized in that: The device comprises an outer tube sleeve, an inner core tube cone, a No. 1 tube segment, a No. 2 tube segment, an upper expansion piece and a lower expansion piece. The upper part of the outer tube sleeve is fixedly connected to the lower end of the probe rod, the lower part of the outer tube sleeve is connected to the inner end of the No. 1 tube segment through a right-angle lock buckle, the upper part of the inner core tube cone extends into the inner cavity of the outer tube sleeve, the upper end of the inner core tube cone is inserted into the U-shaped buckle on the inner wall of the outer tube sleeve, the lower end of the inner core tube cone is a cone tip, the outer wall of the inner core tube cone above the cone tip is connected to the lower end of the No. 2 tube segment through a half-angle lock buckle, and the No. 1 tube segment is connected to the lower end of the No. 2 tube segment through a half-angle lock buckle. The outer end of the piece and the upper end of the No. 2 pipe segment are both connected to the fixing parts, the upper expansion piece is installed in the upper expansion slot of the No. 1 pipe segment, and the lower expansion piece is installed in the lower expansion slot of the No. 2 pipe segment; the No. 1 pipe segment and the No. 2 pipe segment are connected and fixed by T-shaped fasteners. When installing the device, the No. 1 pipe segment is rotated clockwise to 90° vertically to the outer tube casing wall, and then the upper expansion piece is installed into the No. 1 pipe segment along the upper expansion slot; then when the No. 2 pipe segment is rotated counterclockwise to 45°, the lower expansion piece is installed into the No. 2 pipe segment along the lower expansion slot.

2. The retractable and recyclable octagonal cone head device for biogas static pressure discharge according to claim 1, characterized in that: The U-shaped buckle is welded on the inner wall of the outer tube sleeve.

3. The retractable and recyclable octagonal cone head device for biogas static pressure discharge according to claim 1 or 2, characterized in that: The upper part of the outer tube sleeve is threadedly connected with the lower end part of the probe rod.

4. The retractable and recyclable octagonal cone head device for biogas static pressure discharge according to claim 1 or 2, characterized in that: The upper end of the inner core tube cone is snap-fitted to the inner cavity of the outer tube sleeve.

5. An operating method of the retractable and recyclable octagonal cone head device for biogas static pressure discharge as claimed in claim 1, characterized in that: The method comprises the following steps: (a) According to the soil conditions and depth of the construction section of the site, static pressure biogas treatment is selected. The downward pressure cone head device adopts a retractable and recyclable octagonal cone head device for biogas static pressure discharge. The exhaust depth is set according to the depth of the biogas generation layer and the gas storage layer; (b) Hole location arrangement: According to the distribution of methane in the shield tunneling section, the locations of methane emission holes should be measured and marked in advance; (c) Anchors are installed at the hole locations as static counter-pressure devices; (d) Rotate the No. 1 segment clockwise to 90° perpendicular to the outer tube casing wall, and then install the upper expansion piece into the No. 1 segment along the upper expansion slot; (e) When the No. 2 segment is rotated counterclockwise to 45°, the lower expansion piece is installed into the No. 2 segment along the lower expansion slot; (f) Insert the No. 1 and No. 2 segments into the fixings and fasten them together using T-type fasteners; (g) Press the inner core cone into the U-shaped buckle and connect it to the outer tube sleeve; (h) Install the outer tube sleeve of the device installed in step (g) above to the lower end of the probe rod by bolting; (i) The probe with a retractable and retractable cone head is pressed into the corresponding soil layer through a static pressure device to complete the measurement of biogas pressure and flow and exhaust. When the biogas pressure is discharged to a value less than the designed engineering safety value, the exhaust is stopped and the probe is lifted to the next designated exhaust soil layer depth for biogas exhaust; (j) When all tests and exhaust construction are completed, pull all remaining probes off the ground at a uniform speed and remove the cone head device from the lower end of the probe; (k) Remove the T-fastener and the fixing from the cone assembly in sequence; (l) Remove the upper expansion sheet and the lower expansion sheet from the No. 1 segment and the No. 2 segment successively; (m) Rotate the No. 1 and No. 2 segments until they fit closely to the pipe wall; (n) Recovering the components of the cone head device and sealing the biogas discharge hole; (o) Repeat steps (c) to (n) to complete the biogas emission from all the holes in step (b).

6. The method according to claim 5, characterized in that In the step (b), the holes are arranged in a plum blossom shape.

7. The method according to claim 5 or 6, characterized in that In the step (c), for the section where the ground anchor cannot be installed, a crawler-type static pressure device is used to utilize its own weight or add a counterweight as a reaction force device, and then a double-cylinder full hydraulic transmission device is installed.

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