Link telescopic recoverable cone head device for biogas static pressure discharge and operation method

Abstract

A connecting rod telescopic recoverable cone head device for biogas static pressure discharge, comprising a connecting pipe sleeve, an outer cylinder sleeve, telescopic pieces and a cone tip. The upper end of the connecting pipe sleeve is connected to the lower end of a probe rod. An exhaust port is provided at the lower part of the connecting pipe sleeve. The outer cylinder sleeve is sleeved outside the connecting pipe sleeve and the upper end of the outer cylinder sleeve is fixed to the outer wall of the connecting pipe sleeve. The lower end of the outer cylinder sleeve is connected to the upper part of the telescopic piece through a movable connecting piece. An upper hinge support is provided on the bottom surface of the connecting pipe sleeve. The upper hinge support is connected to the upper end of a connecting rod member. The lower end of the connecting rod member is connected to a lower hinge support. The lower hinge support is located in the middle of the inner side of the telescopic piece. The telescopic piece is connected to the cone tip. And a method for operating the connecting rod telescopic recoverable cone head device for biogas static pressure discharge is provided. The present invention can not only effectively recover and recycle the cone head for biogas static pressure discharge, but also has a short construction period, convenient operation, low cost and good subsequent exhaust effect.

Description

Technical Field

[0001] The present invention relates to a connecting rod telescopic recoverable cone head device and an operation method for static pressure discharge of biogas, which are applicable to underground biogas static pressure discharge construction, especially subway construction in soft soil areas, and belong to the technical field of civil engineering. Background Art

[0002] With the continuous development of underground space in China, as one of the harmful factors affecting subway projects, underground biogas has a very adverse impact on subway construction and construction. Therefore, for the construction of subway projects to be built, a pre-exhaust method is often adopted to reduce the many adverse effects brought by underground biogas to the later construction. When constructing subway projects in soft soil areas, biogas is usually discharged by the static pressure method, that is, biogas is discharged by the way of static pressure and pulling out the sounding rod. A disposable cone head is installed at the lower end of the sounding rod to increase the pressure at the rod end, so that the sounding rod can smoothly enter the designed discharge depth. When biogas rises along the inside of the sounding rod through the pressure difference, various valves, sedimentation tanks (gas-liquid separators), pressure gauges and flow meters are connected at the sounding rod port to test the biogas pressure and flow rate. Conventional static pressure biogas discharge construction needs to meet the exhaust work of multiple holes in the way of "one hole position, one cone head". The non-recoverable remaining cone head also poses a danger of damaging the shield equipment. The layout range of the hole positions often needs to be kept 3-5 m outside the tunnel structure line. The limitation of its layout is very likely to cause incomplete biogas discharge, affecting the stability of the tunnel structure and the safety of the crew. Therefore, the use of disposable non-recoverable cone heads in conventional soft soil area biogas static pressure discharge construction not only increases the construction difficulty, but also increases the construction cost and affects the construction quality. Summary of the Invention

[0003] In order to overcome the deficiencies of the existing biogas static pressure discharge cone head device in soft soil areas, such as high cost, long construction period, poor subsequent exhaust effect, etc., the present invention provides a connecting rod telescopic recoverable cone head device for biogas static pressure discharge, which can effectively overcome the shortcomings of the conventional cone head device and its operation method in biogas static pressure discharge in soft soil areas; this device can not only effectively recover and recycle the cone head for biogas static pressure discharge, but also has a short construction period, convenient operation, low cost and good subsequent exhaust effect.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] A connecting rod telescopic recoverable cone head device for biogas static pressure discharge, comprising a connecting pipe sleeve, an outer cylinder sleeve, telescopic pieces and a cone tip. The upper end of the connecting pipe sleeve is connected to the lower end of a sounding rod. An exhaust port is provided at the lower part of the connecting pipe sleeve. The outer cylinder sleeve is sleeved outside the connecting pipe sleeve, and the upper end of the outer cylinder sleeve is fixed to the outer wall of the connecting pipe sleeve. The lower end of the outer cylinder sleeve is connected to the upper part of the telescopic piece through a movable connecting piece. An upper hinge support is provided on the bottom surface of the connecting pipe sleeve. The upper hinge support is connected to the upper end of a connecting rod member. The lower end of the connecting rod member is connected to a lower hinge support. The lower hinge support is located in the middle of the inner side of the telescopic piece. The telescopic piece is connected to the cone tip.

[0006] Further, an external thread is provided at the upper end of the connecting pipe sleeve, and an internal thread section is provided at the lower end of the sounding rod. The external thread at the upper end of the connecting pipe sleeve is installed in the internal thread section at the lower end of the sounding rod.

[0007] Still further, the upper end of the outer cylinder sleeve is connected to the outer wall of the connecting pipe sleeve in a snap-fit manner.

[0008] Furthermore, telescopic snap joints are provided on the telescopic piece, and clamping grooves matching with the telescopic snap joints are provided on the cone tip. The telescopic snap joints are clamped in the clamping grooves.

[0009] The cross-section of the connecting pipe sleeve is square, and four telescopic pieces are provided, which are respectively located on one side of the square.

[0010] An operation method of a connecting rod telescopic recoverable cone head device for biogas static pressure discharge comprises the following steps:

[0011] (a) According to the soil layer condition and depth of the construction section of the site, select a biogas treatment scheme by the static pressure method. Press down the cone head device, which is a biogas discharge shrinkable recoverable cone head device for biogas static pressure discharge, and set the exhaust depth according to the depths of the biogas generation layer and the gas storage layer.

[0012] (b) Layout the hole positions, and measure and mark the positions of the biogas discharge hole positions in advance according to the biogas distribution in the shield tunnel section.

[0013] (c) Drive ground anchors at the hole layout positions as static reaction pressure devices.

[0014] (d) Install the connecting rod member on the movable hinge support and connect it to the connecting pipe sleeve.

[0015] (e) Connect the other end of the connecting rod member to the telescopic piece through a movable hinge support.

[0016] (f) Connect the telescopic piece to the outer cylinder sleeve through a movable connecting piece.

[0017] (g) Install the device installed in the above step (f) on the lower end of the sounding rod through bolts by means of the connecting pipe sleeve.

[0018] (h) The probe rod with a connecting rod telescopic retractable conical head is pressed into the corresponding soil layer through a static pressure device to complete the measurement of biogas pressure, flow rate and exhaust. When the biogas pressure is discharged to less than the design engineering safety value, the exhaust is stopped, and the probe rod is lifted to the next specified exhaust soil layer depth for biogas discharge;

[0019] (i) After all the tests and exhaust construction are completed, the remaining probe rods are evenly pulled out of the ground, and the conical head device is removed from the lower end of the probe rod;

[0020] (j) The movable connecting piece is removed from the conical head device;

[0021] (k) The connecting rod members are successively removed from the movable hinge supports of the telescopic piece and the connecting pipe sleeve;

[0022] (l) The components of the conical head device are recovered, and the biogas discharge hole is sealed;

[0023] (m) Repeat steps (c) to (l) to complete the biogas discharge of all the hole positions in step (b).

[0024] Furthermore, in step (b), the hole positions are arranged in a plum blossom shape.

[0025] Still further, in step (c), for the section where the ground anchor cannot be driven, a crawler-type static pressure device can be used to utilize its own weight or increase the counterweight as a reaction device, and then a double-cylinder full-hydraulic transmission device is installed.

[0026] The beneficial effects of the present invention are mainly manifested in:

[0027] (1) Simple operation and short construction period. Due to the design of the retractable conical head, while ensuring the exhaust effect, it not only meets the requirements of the static pressure sounding rod for quickly penetrating the soft soil layer, but also reduces the side resistance brought by the conical head when the sounding rod is pulled out, ensuring the quick pulling out of the rod, reducing the construction difficulty, and saving the construction period. (2) Low cost. Due to the retractable recovery method, the conical head changes from a disposable component to a recyclable part that can be recycled, reducing the cost of the conical head and saving the exhaust construction cost. (3) No obstacles left, convenient for subsequent shield construction. Since the conventional non-recyclable conical head will leave conical head obstacles in the soil, it is extremely easy to damage the shield cutter head during subsequent shield construction, resulting in an extended construction period and huge economic losses. The retractable recyclable conical head device can solve the problem of conical head obstacles remaining in the soil layer, making the subsequent shield construction more convenient. (4) Flexible arrangement of exhaust holes and good exhaust effect. Due to the existence of conventional non-recyclable conical head obstacles, it is extremely easy to affect the subsequent shield construction. Conventional biogas exhaust holes can only be arranged outside the shield construction area and cannot be drilled according to the actual burial position and depth of the biogas, resulting in an unsatisfactory exhaust effect relying solely on the exhaust holes outside the construction area, and prone to safety accidents such as biogas leakage and ignition, and soil instability during construction. The retractable recyclable conical head can flexibly arrange the exhaust holes according to the specific burial position and depth of the biogas, breaking through the limitation that only exhaust holes can be arranged outside the shield construction area in the original construction, making the biogas emission more thorough and the effect better. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the front sectional view of the connecting rod telescopic recyclable conical head device for biogas static pressure discharge.

[0029] Figure 2 is Figure 1 the A-A sectional view of

[0030] Figure 3 is the schematic diagram of the connecting sleeve.

[0031] Figure 4 is the three-dimensional view of the telescopic piece.

[0032] Figure 5 is the sectional view of the telescopic piece. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present invention will be further described below with reference to the accompanying drawings.

[0034] Referring to Figures 1 to 5 , a connecting rod telescopic recyclable conical head device for biogas static pressure discharge includes a connecting pipe sleeve 1, an outer cylinder pipe sleeve 2, a movable connecting piece 3, a telescopic piece 4, a conical tip 5, an exhaust port 6, a movable hinge support, a telescopic bayonet 8, and a connecting rod member 9;

[0035] The upper end of the connecting pipe sleeve 1 is connected to the lower end of the probe rod 10. An exhaust port 6 is provided at the lower part of the connecting pipe sleeve 1. The outer cylinder sleeve 2 is sleeved outside the connecting pipe sleeve 1, and the upper end of the outer cylinder sleeve 2 is fixed to the outer wall of the connecting pipe sleeve 1. The lower end of the outer cylinder sleeve 2 is connected to the upper part of the telescopic piece 4 through a movable connecting piece 3. The bottom surface of the connecting pipe sleeve 1 is provided with an upper hinge support 7, the upper hinge support 7 is connected to the upper end of the connecting rod member 8, the lower end of the connecting rod member 8 is connected to a lower hinge support, and the lower hinge support is located in the middle of the inner side of the telescopic piece 4. The telescopic piece 4 is connected to the conical tip 5.

[0036] Further, an external thread is provided at the upper end of the connecting pipe sleeve 1, and an internal thread section is provided at the lower end of the probe rod 10. The external thread at the upper end of the connecting pipe sleeve is installed in the internal thread section at the lower end of the probe rod.

[0037] Still further, the upper end of the outer cylinder sleeve 2 is connected to the outer wall of the connecting pipe sleeve 1 in a snap-fit manner.

[0038] Even further, a telescopic bayonet 8 is provided on the telescopic piece 4, and a bayonet slot matching the telescopic bayonet is provided on the conical tip 5. The telescopic bayonet is snap-fitted in the bayonet slot.

[0039] The cross-section of the connecting pipe sleeve 1 is square, and four telescopic pieces 4 are provided, which are respectively located on one side of the square.

[0040] In a certain subway construction section, a large amount of biogas with relatively high air pressure exists in the ⑥2 silty clay and the ⑧2 silty clay in the underground soil layer. In order to ensure the safety of the project construction, biogas emission is required. In order to obtain the burial situation of the underground soil layer biogas and for biogas emission, using a one-time conventional cone head can only arrange biogas emission holes within a range of 3 - 5 m outside the tunnel structure line. However, using the connecting rod telescopic and recoverable cone head device for biogas static pressure emission in soft soil areas of subway construction of the present invention can not only achieve biogas emission and quickly lower the cone head to the set depth, but also realize the recoverable utilization of the cone head, greatly reducing the construction cost, accelerating the construction progress, and ensuring the safety of shield construction. The biogas emission hole penetrates the gas-bearing layer with the minimum diameter and passes through the gas-generating layer and the gas storage layer. The hole depth should penetrate the ⑥2 silty clay and enter the ⑧2 silty clay to a certain depth. The designed hole depth of a single hole is 45 m.

[0041] In this biogas treatment and emission construction, an XY-100 type drilling rig is used to assist in hole guiding and combined with a static pressure emission device. Since the biogas content in this project is large and the area is wide, using the one-time conventional cone head of the original static pressure emission device not only has a high cost and a long construction period, but also has obstacles left and a poor exhaust effect. Using the telescopic and recoverable cone head device can realize the recycling of the cone head, and has the advantages of low cost, short construction period, convenient subsequent construction, and good exhaust effect.

[0042] The implementation schemes of the present invention are as follows:

[0043] (n) According to the soil layer conditions and depths of the construction sections of the site, select the static pressure method for biogas treatment. The downward pressure cone head device adopts a connecting rod telescopic recoverable cone head device for static pressure discharge of biogas. Set the exhaust depth to 45 m according to the depths of the biogas generation layer and the gas storage layer.

[0044] (o) Layout the hole positions according to the biogas distribution in the shield tunnel section in advance, and measure and mark the positions of the biogas discharge holes. The hole positions are arranged in a plum blossom shape.

[0045] (p) Drive ground anchors at the hole layout positions as static pressure reaction devices. For sections where ground anchors cannot be driven, crawler-type static pressure equipment can be used to utilize its own weight or increase the counterweight as a reaction device, and then install a double-cylinder full-hydraulic drive equipment.

[0046] (q) Install the connecting rod member 9 on the movable hinge support 7 and connect it with the connecting pipe sleeve 1.

[0047] (r) Connect the other end of the connecting rod member 9 with the telescopic piece 4 through the movable hinge support 7.

[0048] (s) Connect the telescopic piece 4 with the outer cylinder pipe sleeve 2 through the movable connecting piece 3.

[0049] (t) Install the connecting pipe sleeve 1 to the lower end 10 of the sounding rod by bolts for the device installed in (f) above.

[0050] (u) Press the sounding rod with a connecting rod telescopic recoverable cone head into the corresponding soil layer through the static pressure device to complete the measurement of biogas pressure, flow rate and exhaust. When the biogas pressure is discharged to be less than the design engineering safety value, stop the exhaust, and lift the sounding rod to the next specified exhaust soil layer depth for biogas discharge.

[0051] (v) When all the testing and exhaust construction are completed, uniformly pull out all the remaining sounding rods from the ground, and remove the cone head device from the lower end 10 of the sounding rod.

[0052] (w) Remove the movable connecting piece 3 from the cone head device.

[0053] (x) Remove the connecting rod member 9 from the movable hinge supports 7 of the telescopic piece 4 and the connecting pipe sleeve 1 one after another.

[0054] (y) Recover each component of the cone head device, and seal the biogas discharge hole.

[0055] (z) Repeat steps (c) to (l) to complete the biogas discharge of all the hole positions in step (b).

Claims

1. A method of operating a connecting rod telescopic retractable cone head device for biogas static pressure discharge, characterized in that, The device includes a connecting pipe sleeve, an outer cylinder sleeve, a telescopic piece and a conical tip. The upper end of the connecting pipe sleeve is connected to the lower end of the probe rod. An exhaust port is provided at the lower part of the connecting pipe sleeve. The outer cylinder sleeve is sleeved outside the connecting pipe sleeve, and the upper end of the outer cylinder sleeve is fixed to the outer wall of the connecting pipe sleeve. The lower end of the outer cylinder sleeve is connected to the upper part of the telescopic piece through a movable connecting piece. An upper hinge support is provided on the bottom surface of the connecting pipe sleeve. The upper hinge support is connected to the upper end of a connecting rod member. The lower end of the connecting rod member is connected to a lower hinge support. The lower hinge support is located in the middle of the inner side of the telescopic piece. The telescopic piece is connected to the conical tip; An external thread is provided at the upper end of the connecting pipe sleeve, and an internal thread section is provided at the lower end of the probe rod. The external thread at the upper end of the connecting pipe sleeve is installed in the internal thread section at the lower end of the probe rod. The upper end of the outer cylinder sleeve is connected to the outer wall of the connecting pipe sleeve in a snap-fit manner. A telescopic snap is provided on the telescopic piece, and a card slot matching the telescopic snap is provided on the conical tip. The telescopic snap is snap-connected in the card slot. The cross-section of the connecting pipe sleeve is square, and there are four telescopic pieces, which are respectively located on one side of the square; The method includes the following steps: (a) According to the soil layer condition and depth of the site construction section, select a static pressure method for biogas treatment, adopt a connecting rod telescopic and recoverable conical head device for biogas static pressure discharge, and set the exhaust depth according to the depth of the biogas generation layer and the gas storage layer; (b) Layout the hole positions, and measure and mark the positions of the biogas discharge holes in advance according to the biogas distribution in the shield tunnel section; (c) Drive in ground anchors at the hole layout positions as static pressure reaction devices; (d) Install one end of the connecting rod member on the upper hinge support and connect it to the connecting pipe sleeve; (e) Connect the other end of the connecting rod member to the telescopic piece through the lower hinge support; (f) Connect the telescopic piece to the outer cylinder sleeve through a movable connecting piece; (g) Install the device installed in the above step (f) to the lower end of the probe rod through bolts; (h) Use a static pressure device to press the probe rod with a connecting rod telescopic and recoverable conical head into the corresponding soil layer to complete the measurement of biogas pressure and flow rate and exhaust. When the biogas pressure is discharged to be less than the design engineering safety value, stop exhausting, and lift the probe rod to the next specified exhaust soil layer depth for biogas discharge; (i) After all the tests and exhaust construction are completed, uniformly pull out all the remaining probe rods from the ground, and remove the conical head device from the lower end of the probe rod; (j) Remove the movable connecting piece from the conical head device; (k) Remove the connecting rod member from the lower hinge support and the upper hinge support respectively connected to the telescopic piece and the connecting pipe sleeve; (l) Recover each component of the conical head device, and seal the biogas discharge hole; (m) Repeat steps (c)~(l) to complete the biogas discharge of all the hole positions in step (b).

2. The method according to claim 1, characterized in that, In the above step (b), the hole positions are arranged in a plum blossom shape.

3. The method according to claim 1 or 2, characterized in that, In the above step (c), for the section where ground anchors cannot be driven, use a crawler-type static pressure equipment to use its own weight or add counterweights as a reaction device, and then install a double-cylinder full-hydraulic drive equipment.

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