Bottom discharging equipment for high-power vibroflotation lower assistance immersed tube and construction process

Abstract

The invention relates to a high-power vibroflotation lower assistance immersed tube bottom discharging device and a construction technology, and belongs to the field of vibroflotation construction. The device comprises a vibroflot, an immersed tube used for conveying filler and a lower power assisting system used for applying downward pressure to the immersed tube and the vibroflot, a feeding port is formed in the upper portion of the immersed tube, and a discharging port is formed in the lower end of the immersed tube. The lower power assisting mode of the lower power assisting system comprises but not limited to a vibration hammer, an impact hammer, a down-the-hole hammer and a winch lower pressurization system. The discharging mode is bottom discharging, including but not limited to damper upper portion discharging and vibroflot head discharging. The material guide pipeline of the immersed tube can be an external water, gas and gas pipeline channel or a water, gas and stone pipeline channel in the material guide pipeline, and is suitable for diversified construction. A high-power vibroflot is adopted to be matched with an immersed tube for construction, and the device is particularly suitable for treating muddy clay geology.

Description

Technical Field

[0001] The invention relates to the technical field of vibroflotation construction, and in particular to high-power vibroflotation auxiliary sinking pipe bottom discharge equipment and a construction process. Background Art

[0002] During the vibroflotation process, some engineering geological conditions are special, for example, there is a muddy clay geology that is not suitable for drilling, and at the same time, it contains a large number of large stones; or it is a muddy clay geology that is not suitable for drilling, and it also contains a building backfill layer. For this kind of geology, ordinary vibroflotation equipment cannot be used or is very difficult to use.

[0003] For this type of geology, if only the immersed tube method is used for construction, firstly, the immersed tube has great resistance to forward movement and is easily bent or damaged by huge static pressure or impact force. Moreover, it has no compacting effect on the surrounding geology and the bearing capacity of the pile is limited.

[0004] Based on this, the present invention is proposed. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a high-power vibro-floating bottom-assisted submerged tube discharging equipment and a construction process, and the technical solution is as follows:

[0006] On the one hand, a high-power vibratory downward-assisted immersed tube bottom discharge equipment includes a vibrator, an immersed tube for conveying fillers, and a downward-assisted system for applying downward pressure to the immersed tube and the vibrator. A feed port is provided at the upper part of the immersed tube, and a discharge port is provided at the lower end of the immersed tube.

[0007] Furthermore, the lower assist system is a vibratory hammer, an impact hammer, a down-the-hole hammer or a winch lower pressurization system.

[0008] Furthermore, the immersed tube is a straight tube or a curved tube.

[0009] Furthermore, when the immersed tube is a curved tube, the immersed tube is provided with a lower extension portion, and the lower extension portion is fixedly installed on the outer side of the vibrator; a transition tube is provided between the immersed tube and the lower extension portion; and the lower end of the lower extension portion is a discharge port.

[0010] Furthermore, a guide rod is provided at the upper end of the vibrator, and a shock absorber is installed between the guide rod and the upper end of the vibrator;

[0011] The discharge port is arranged at the vibratory punching head of the vibratory punch, or the discharge port is arranged at the upper end position of the shock absorber.

[0012] Furthermore, a material guiding pipe for the filling material to pass through is arranged inside the immersed tube, and the guide rod is arranged outside or inside the material guiding pipe.

[0013] Furthermore, the winch pressurization system includes a mast, a slide, a winch, and a steel wire rope. Pullways matching the steel wire rope are installed at the upper and lower ends of the mast. The slide is slidably connected to the mast, and the slide is connected to the steel wire rope. The winch drives the slide to move up and down along the mast by winding the steel wire rope around the pulley.

[0014] Furthermore, the projection area of ​​the inner circle of the immersed tube on the horizontal plane is S1, the maximum projection area of ​​the outer circle of the vibrator on the horizontal plane is S2, Δ=S2 / S1;

[0015] When the guide rod is located outside the material guide pipe, 0.4≤Δ≤0.45;

[0016] When the guide rod is located inside the material guiding pipe, 0.5≤Δ≤0.55.

[0017] On the second aspect, the high-power vibro-floating down-assisted bottom discharge equipment of the immersed tube is used for vibro-floating construction in silty clay geology.

[0018] In the third aspect, the high-power vibro-floating bottom-assisted sinking tube discharging construction process adopts the high-power vibro-floating bottom-assisted sinking tube discharging equipment, including the following steps:

[0019] Step 1: Move the high-power vibratory down-assisted pipe bottom discharge equipment to the pile-making position, lower the vibrator to the ground, start the down-assisted system, and press the vibrator into the ground; when the discharge port is pressed 200mm to 300mm underground, add fillers to the feed port; then, continue to press the vibrator and the pipe down to the required depth of the project;

[0020] Step 2: Lift the vibrator upward by 100 to 200 mm, start the vibrator, maintain the specified vibration retention time, and put the filler into the feed port again;

[0021] Step 3: Lift the vibrator and the immersed tube at a closer distance according to the project requirements, then maintain the specified vibration retention time and add fillers to the feed port;

[0022] Step 4: Repeat step 3 until the vibrator is lifted to the ground and the immersed tube is pulled out.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The downward power-assisting methods of the downward power-assisting system include but are not limited to vibratory hammer, impact hammer, down-the-hole hammer, and winch downward pressure system. The downward pressure can reach 3 to 20 tons.

[0025] 2. The discharging method is bottom discharging, including but not limited to discharging from the top of the shock absorber and discharging from the head of the vibrator.

[0026] 3. The material guide pipe of the immersed tube can be an external water, electricity and gas pipeline channel, or the internal part of the material guide pipe can be a water, electricity and stone pipeline channel, which is suitable for diversified construction.

[0027] 4. Use high-power vibrator and sinking tube for construction, which is particularly suitable for treating silty clay geology.

[0028] 5. The vibrator is equipped with a shock absorber, which has strong impact resistance and is particularly suitable for silty clay geology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the high-power vibro-floating bottom discharging equipment for assisting the submerged tube as described in Example 2;

[0030] Figure 2 Schematic diagram of the high-power vibro-floating bottom discharging equipment for assisting the submerged tube as described in Example 3;

[0031] Figure 3 is a schematic diagram of the guide rod being located inside the immersed tube;

[0032] Figure 4 It is a schematic diagram of the high-power vibro-floating auxiliary sinking tube bottom discharge equipment described in Example 4;

[0033] Figure 5 It is a schematic diagram of the high-power vibro-floating auxiliary sinking tube bottom discharge equipment described in Example 5;

[0034] Figure 6 is a schematic diagram of the guide rod being located outside the immersed tube;

[0035] Figure 7 It is a schematic diagram of the high-power vibro-assisted bottom discharge equipment for immersed tubes described in Example 6. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with specific embodiments. The embodiments described below are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] The high-power vibratory downward-assisted bottom discharging equipment for a submerged tube comprises a vibrator, a submerged tube for conveying fillers, and a downward-assisted system for applying downward pressure to the submerged tube and the vibrator. The submerged tube is installed above the vibrator, a feed port is provided at the upper part of the submerged tube, and a discharge port is provided at the lower end of the submerged tube.

[0039] The downward force system applies downward pressure (3 to 20 tons) to the immersed tube and vibrator to assist in the vibratory construction.

[0040] Example 2

[0041] like Figure 1 , 3 As shown, a high-power vibratory downward-assisted immersed tube bottom discharge equipment comprises a vibrator 10, an immersed tube 20 for conveying fillers, and a downward-assisted system for applying downward pressure to the immersed tube 20 and the vibrator 10. The immersed tube 20 is installed above the vibrator 10, a feed port is provided at the upper portion of the immersed tube 20, and a discharge port is provided at the lower end of the immersed tube 20.

[0042] Wherein, the lower assist system is a vibrating hammer 40. The immersed tube 20 is a straight tube.

[0043] A downward vibration impact force is applied to the immersed tube 20 and the vibrator 10 by a vibrating hammer 40, and the horizontal exciting force generated by the vibrator 10 itself is cooperated, so that vibratory construction can be well carried out even for geology 1 (silty clay geology), geology 2 (silty clay geology + containing a large number of large stones), and geology 3 (silty clay geology + containing a building backfill layer in the middle).

[0044] A guide rod 101 is disposed at the upper end of the vibrator 10 , and a shock absorber 11 is installed between the guide rod 101 and the upper end of the vibrator 10 ; the discharge port is disposed at the vibrator head of the vibrator 10 .

[0045] The immersed tube 20 is provided with a material guide pipe 21 for the filler to pass through, and the guide rod 101 is provided inside the material guide pipe 21. A water, electricity, gas and stone material pipeline channel is provided inside the guide rod 101. The inside of the material guide pipe 21 is a water, electricity, gas and stone material pipeline channel, and the area except the guide rod 101 is a filler (such as stone material) channel.

[0046] In the present invention, the stone is transported downward from the filling channel in the sinking tube 20, and finally flows out from the discharge port under the action of gravity and the downward impact force of the vibrating hammer 40. At this time, under the action of the horizontal exciting force of the vibrator, the stone will be thrown out from the discharge port, and it will form a vibrating pile in cooperation with the vibrator; because the inner diameter of the sinking tube 20 is larger, the vibrator further compacts, which is equivalent to vibrating and compacting the pipe pile made by the existing sinking tube method, which is equivalent to forming a larger diameter vibrating pile (referred to as a large diameter vibrating pile); significantly improving the bearing capacity and stability of the existing vibrating pile.

[0047] Compared with the method of directly increasing the outer diameter of the vibrator to increase the diameter of the vibratory pile, the construction difficulty in silty clay geology is very large and it is almost impossible to drive deep piles.

[0048] Example 3

[0049] The only difference between this example and Example 2 is that the lower power assist system is different; Figure 2 As shown, the lower assist system is a winch lower pressurization system; the winch lower pressurization system includes a mast 32, a carriage 35, a winch 31, and a steel wire 34. The upper and lower ends of the mast 32 are both equipped with pulleys 33 matching the steel wire. The carriage 35 is slidably connected to the mast 32, and the carriage 35 is connected to the steel wire 34. The winch 31 drives the carriage 35 to move up and down along the mast 32 through the steel wire 34 through the pulley 33. In this way, the winch lower pressurization system can apply downward pressure to the submerged pipe and the vibrator.

[0050] Example 4

[0051] like Figure 4 As shown, a high-power vibratory downward-assisted immersed tube bottom discharge equipment comprises a vibrator 10, an immersed tube 20 for conveying fillers, and a downward-assisted system for applying downward pressure to the immersed tube 20 and the vibrator 10. The immersed tube 20 is installed above the vibrator 10, a feed port is provided at the upper portion of the immersed tube 20, and a discharge port is provided at the lower end of the immersed tube 20.

[0052] Wherein, the lower power assist system is a winch lower pressurization system.

[0053] The immersed tube 20 is a curved tube. The immersed tube 20 is provided with a lower extension 201, and the lower extension 201 is fixedly installed on the outer side of the vibrator 10; a transition tube 202 is provided between the immersed tube 20 and the lower extension 201; and the lower end of the lower extension 201 is a discharge port.

[0054] In this way, the upper part of the equipment is the immersed tube 20, and the equipment structure is more compact.

[0055] Due to the use of bottom discharge, when the sinking tube 20 and the vibrating device are pulled up, a pipe pile will be formed at the position of the sinking tube 20; however, on one side of the vibrating device, a vibrating pile will be formed under the filling of the filler (such as stone) continuously thrown out at the discharge port, and the vibrating device will also encrypt one side of the pipe pile; finally, a composite pile of pipe pile and vibrating pile can be formed, and the junction of the pipe pile and the vibrating pile is vibrated and compacted, which is better than the existing "pipe pile + pipe pile" composite effect. In addition, the composite pile of pipe pile and vibrating pile has better performance than a single pipe pile and vibrating pile. If "vibrating pile + vibrating pile" is used, it cannot be vibrated in silty clay geology compared to ordinary vibrating piles with large diameters.

[0056] Therefore, in the present invention, a composite pile of a pipe pile and a vibro-impact pile with better performance is finally constructed.

[0057] Example 5

[0058] The only difference between this example and Example 3 is that the position of the guide rod 101 is different; Figure 5 , 6 As shown, the guide rod 101 is arranged outside the material guide pipe 21. The inside of the guide rod 101 is a water, electricity and gas channel 102. The material guide pipe 21 inside the immersed tube 20 is all used to transport stones, and its transport effect is better.

[0059] The pile body finally obtained by construction in this example is a large-diameter vibratory pile.

[0060] Example 6

[0061] The difference between this example and Example 5 is that the position of the discharge port is different. Figure 7 As shown, the discharge port is located at the vibrating head of the vibrating device. The pile body finally obtained by construction in this example is a composite pile of a pipe pile and a vibrating pile.

[0062] Example 7

[0063] The high-power vibro-floating bottom-assisted pipe discharging construction process adopts the high-power vibro-floating bottom-assisted pipe discharging equipment described in any one of Examples 1 to 6, and comprises the following steps:

[0064] Step 1, move the high-power vibratory down-assisting pipe bottom discharge equipment to the pile making position, lower the vibrator to the ground, start the down-assisting system (such as a vibrating hammer), and press the vibrator into the ground; when the discharge port is pressed 200mm to 300mm underground, use a special feeding device to put fillers into the feed port, and put 1 to 1.5 cubic meters of stone into the feed port (to prevent the discharge port from being blocked); then, continue to press the vibrator and the pipe down to the required depth of the project;

[0065] Step 2: Lift the vibrator upward by 100 to 200 mm, start the vibrator, maintain the specified vibration retention time, and put the filler into the feed port again;

[0066] Step 3: Lift the vibrator and the immersed tube at a closer distance according to the project requirements, then maintain the specified vibration retention time and add fillers to the feed port;

[0067] Step 4: Repeat step 3 until the vibrator is lifted to the ground and the immersed tube is pulled out.

[0068] The invention adds a vibrating hammer to make the vibroflotation method applicable to a wider range of geological conditions, and complements the vibroflotation method with geological conditions, especially for conventional sand and gravel geology, which solves the restriction of vibroflotation method on gravel geological conditions. (Conventional vibroflotation method is applicable to sand, silt, backfill soil, etc.), and the addition of a submerged pipe makes the vibroflotation method applicable to silty clay geology, reducing settlement and liquefaction. The three are combined to apply to a wider range of strata, and the efficiency is doubled.

[0069] In the present invention, the vibratory hammer is on top and the vibroflotation is on the bottom. The vibroflotation method forms holes in the foundation through the action of vibration and high-pressure water flow, and then fills in materials such as crushed stone, and compacts them through vibration to form a dense pile body. The vibratory hammer uses its downward vibration to assist the vibroflotation device to sink and the filler to compact downward, thereby improving construction efficiency and increasing construction speed. High quality of piles: The discharge port position of the immersed tube and the drive of the vibroflotation device, whether it is a large-diameter vibroflotation pile or a composite pile of a pipe pile and a vibroflotation pile, are of better quality than existing vibroflotation piles and pipe piles.

[0070] In the prior art, if only vibro-impacting is used in conjunction with a vibratory hammer for construction, it can only speed up the hole-making speed for conventional geology. It does not set a sinking pipe, and only forms conventional vibro-impact piles; it does not form special large-diameter vibro-impact piles or composite piles of pipe piles and vibro-impact piles; moreover, after the hole-making is completed, the existing vibro-impacter generally uses a bulldozer to pour fillers into the hole for filling, and this method cannot be used for construction in silty clay geology.

[0071] The existing vibrating hammer is used in conjunction with the immersed tube for construction, which can easily damage or bend the immersed tube.

[0072] The existing vibroflotation and immersed tube construction method cannot be carried out in geology 1 to 3.

[0073] Example 8

[0074] The porosity of silty clay is usually less than 1.5, while the porosity of ordinary clay is greater than or equal to 1.5. This means that the particles of silty clay are more closely arranged, with fewer pores and relatively lower water content.

[0075] Muddy clays are composed of fine particles, including clay, silt, and small amounts of sand. The size and distribution of these particles give them high plasticity and cohesion. Ordinary clays are composed mainly of larger particles, such as sand and silt, whose size and distribution give them low plasticity and cohesion.

[0076] Theoretically, the internal friction angle of ordinary clay should be 0°, because the clay particles are small and the friction is small. However, in actual engineering, due to the small friction of clay particles, its internal friction angle is usually between 0° and 5°. The internal friction angle of silty clay geology is greater than 5°. For special silty clay geology, the internal friction angle of silty clay can reach 25° to 30°.

[0077] During construction, it was found that during the vibratory construction process, the corresponding mud of ordinary clay will show Bingham fluid properties. During the vibratory construction process, the corresponding mud of silty clay will show time-dependent non-Newtonian fluid properties. The different effects of the vibrator on the immersed tube will significantly affect the effect of throwing materials at the discharge port, directly affect whether the stone can be thrown out and whether the area near the vibrator can be completely filled, and directly affect the quality of the pile.

[0078] The guide rod 101 is located inside or outside the material guiding pipe 21. The different vibration effects transmitted by the guide rod 101 will significantly affect the material throwing effect of the discharge port.

[0079] The projection area of ​​the inner circle of the immersed tube 20 on the horizontal plane is S1, and the maximum projection area of ​​the outer circle of the vibrator 10 on the horizontal plane is S2, Δ=S2 / S1;

[0080] When the guide rod 101 is located outside the material guide pipe 21, 0.4≤Δ≤0.45; preferably 0.43. For example, for geology 4 (conventional silty clay geology, porosity less than 1.5, internal friction angle greater than 5°), when Δ<0.4, the pile body finally formed was found to have no fault or cavity defects through ultrasonic detection and geological radar detection; when Δ>0.45, the pile body finally formed was found to have no fault or cavity defects. For geology 5 (special silty clay geology, porosity less than 1.2, internal friction angle greater than 25°), when Δ<0.4, the pile body finally formed was found to have fault defects; when Δ>0.45, the pile body finally formed was found to have cavity defects.

[0081] When the guide rod 101 is located inside the material guide pipe 21, 0.5≤Δ≤0.55; preferably 0.52. For example, for geology 4 (conventional silty clay geology, porosity less than 1.5, internal friction angle greater than 5°), when Δ<0.5, the pile body finally formed is found to have no fault or cavity defects, and the pile body density is 9 to 10 hits (dynamic penetration method); when Δ>0.55, the pile body finally formed is found to have no fault or cavity defects, and the pile body density is 9 to 10 hits; for geology 5 (special silty clay geology, porosity less than 1.2, internal friction angle greater than 25°), when Δ<0.5, the pile body finally formed is found to have no fault or cavity defects, but the pile body density is only 5 to 6 hits; when Δ>0.55, the pile body finally formed is found to have fault defects.

[0082] In addition, it should be understood that those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-power vibratory down-boosting bottom discharge equipment for a submerged pipe, comprising a vibratory down-boosting device (10), characterized in that: It also comprises a submerged tube (20) for conveying filler, and a lower assist system for applying downward pressure to the submerged tube (20) and the vibrator (10); a feed port is arranged at the upper part of the submerged tube (20), and a discharge port is arranged at the lower end of the submerged tube (20).

2. The high-power vibroflotation assisted bottom discharge equipment for immersed tubes according to claim 1 is characterized in that: The lower power assist system is a vibrating hammer (40), an impact hammer, a down-the-hole hammer or a winch lower pressure system.

3. The high-power vibroflotation bottom discharging equipment according to claim 1 is characterized in that: The immersed tube (20) is a straight tube or a curved tube.

4. The high-power vibroflotation-assisted bottom discharge equipment for submerged pipes according to claim 3 is characterized by: When the immersed tube (20) is a curved tube, the immersed tube (20) is provided with a lower extension portion (201), and the lower extension portion (201) is fixedly mounted on the outer side of the vibrator (10); a transition tube (202) is provided between the immersed tube (20) and the lower extension portion (201); and the lower end of the lower extension portion (201) is a discharge port.

5. The high-power vibroflotation assisted bottom discharge equipment for immersed tubes according to claim 1 is characterized in that: A guide rod (101) is provided at the upper end of the vibrator (10), and a shock absorber (11) is installed between the guide rod (101) and the upper end of the vibrator (10); The discharge port is arranged at the vibrating head of the vibrating device (10), or the discharge port is arranged at the upper end of the shock absorber (11).

6. The high-power vibroflotation-assisted bottom discharge equipment for sinking pipes according to claim 5 is characterized in that: A material guide pipe (21) for fillers to pass through is arranged inside the immersed tube (20), and the guide rod (101) is arranged outside or inside the material guide pipe (21).

7. The high-power vibroflotation-assisted bottom discharge equipment for submerged pipes according to claim 2 is characterized in that: The winch lower pressurization system comprises a mast (32), a slide (35), a winch (31), and a steel wire rope (34); pulleys (33) matching the steel wire rope are installed at the upper and lower ends of the mast (32); the slide (35) is slidably connected to the mast (32); the slide (35) is connected to the steel wire rope (34); the winch (31) drives the slide (35) to perform lifting movement along the mast (32) by winding the steel wire rope (34) around the pulley (33).

8. The high-power vibroflotation-assisted bottom discharge equipment for submerged pipes according to claim 6 is characterized by: The projection area of ​​the inner circle of the immersed tube (20) on the horizontal plane is S1, and the maximum projection area of ​​the outer circle of the vibrator (10) on the horizontal plane is S2, Δ=S2 / S1; When the guide rod (101) is located outside the material guiding pipe (21), 0.4≤Δ≤0.45; When the guide rod (101) is located inside the material guiding pipe (21), 0.5≤Δ≤0.

55.

9. The high-power vibro-floating bottom discharge equipment for assisted submerged pipes as claimed in any one of claims 1 to 8 is used for vibro-floating construction in silty clay geology.

10. High-power vibro-floating bottom-assisted sinking tube discharging construction process, characterized by: The high-power vibro-floating bottom discharging equipment for assisting the submerged pipe according to any one of claims 1 to 8 comprises the following steps: Step 1: Move the high-power vibratory down-assisted pipe bottom discharge equipment to the pile-making position, lower the vibrator to the ground, start the down-assisted system, and press the vibrator into the ground; when the discharge port is pressed 200mm to 300mm underground, add fillers to the feed port; then, continue to press the vibrator and the pipe down to the required depth of the project; Step 2: Lift the vibrator upward by 100 to 200 mm, start the vibrator, maintain the specified vibration retention time, and put the filler into the feed port again; Step 3: Lift the vibrator and the immersed tube at a closer distance according to the project requirements, then maintain the specified vibration retention time and add fillers to the feed port; Step 4: Repeat step 3 until the vibrator is lifted to the ground and the immersed tube is pulled out.

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