Railway overhead support pile drilling equipment and construction method

Abstract

The present invention provides a railway overhead support pile drilling device and a construction method, which belong to the technical field of railway overhead support pile construction. The device comprises a drilling rig assembly for drilling, a precast concrete pipe segment for supporting the inner wall of the borehole, a lifting mechanism for lifting the precast concrete pipe segment, and a mud circulation system. The drilling rig assembly comprises a waterproof motor box, a waterproof motor is provided in the waterproof motor box, the output shaft of the waterproof motor extends downward and drives a drill bit located below the waterproof motor box, the top side of the drill bit is provided with retractable drill teeth, and the waterproof motor box is detachably fixed to the lower end of the bottom precast concrete pipe segment. The present invention reduces the construction difficulty of railway overhead support piles, and can effectively avoid hole collapse and surface collapse, thereby improving safety, and solving the problem of drilling railway overhead support piles under geological conditions such as high groundwater level, large water volume, silt sand, and flowing mud.

Description

Technical Field

[0001] The invention relates to the technical field of railway overhead support pile construction, and in particular to railway overhead support pile drilling equipment and a construction method. Background Art

[0002] Due to the close proximity of overhead support piles to the railway tracks, and to ensure construction does not intrude upon the building envelope of railway equipment, currently all overhead support piles are constructed using manually excavated piles, in accordance with railway management and design documents. However, this technical solution is difficult or impossible to implement in silt and silt formations with high groundwater levels, abundant water reserves, or where groundwater extraction is restricted (e.g., groundwater extraction is prohibited within 200 meters of a high-speed railway line). Furthermore, manually excavated piles can easily cause hole collapse and ground subsidence, leading to traffic and personal injury accidents. The reason for the collapse of the hole and the ground subsidence is that the construction of bored piles needs to keep the hole free of water, which requires continuous pumping of the water in the hole. As the depth of the hole increases, the height difference between the natural water level outside the bored pile and the working surface at the bottom of the hole will gradually increase, causing a large pressure difference between the inside and outside of the hole. The silt and silt geology have strong fluidity under the action of water, and will surge back from the bottom of the hole to the inside of the hole, which will lead to difficulties such as being unable to dig down and unable to build retaining walls. This not only increases the difficulty of construction, but more importantly, the sand and soil that surge back are constantly removed, resulting in a large amount of soil excavated from the retaining wall, which leads to the collapse of the pile hole and soil. Figure 9 . Summary of the Invention

[0003] In view of this, the present invention provides a railway overhead support pile drilling equipment and construction method, which reduces the construction difficulty of railway overhead support piles, and can effectively avoid hole collapse and surface collapse, improve safety, and solve the problem of drilling railway overhead support piles under geological conditions such as high groundwater level, large water volume, silt sand, and mud flow.

[0004] To solve the above technical problems, the present invention provides a railway overhead support pile drilling device, comprising a drilling rig assembly for drilling, a precast concrete pipe segment for supporting the inner wall of the drill hole, a lifting mechanism for lifting the precast concrete pipe segment, and a mud circulation system;

[0005] The drilling rig assembly includes a waterproof motor box, in which a waterproof motor is installed. The output shaft of the waterproof motor extends downward and drives a drill bit located below the waterproof motor box. The top side of the drill bit is provided with retractable drill teeth. The waterproof motor box can be detachably fixed to the lower end of the bottom precast concrete pipe section.

[0006] Furthermore, a supporting cross frame is provided on the side wall of the waterproof motor box, and an L-shaped supporting bracket is provided at the lower end of the precast concrete pipe section at the bottom layer. A U-shaped frame for clamping the supporting cross frame is provided on the side wall opposite to the waterproof motor box. The top of the waterproof motor box is connected to one end of the drilling rig pulling rope, and the free end of the drilling rig pulling rope is outside the drill hole.

[0007] Furthermore, the U-shaped frame is provided with a vertical limit pin hole, and the end of the supporting cross frame is provided with a through hole corresponding to the limit pin hole. After the supporting cross frame is inserted into the U-shaped frame, it is limited by a pin, and the pin is connected to one end of the pulling wire rope, and the free end of the pulling wire rope is outside the drilled hole.

[0008] By adopting the above technical solution, the drilling rig assembly and the bottom precast concrete pipe section can be easily disassembled and installed.

[0009] Furthermore, the retractable drill tooth includes a drill tooth, one end of which is hinged to the drill bit, and the drill bit is provided with a limit block above the drill tooth. A limit tension spring is provided between the drill tooth and the drill bit, one end of the limit tension spring is fixed to the drill bit, and the other end of the limit tension spring is fixed to the drill tooth.

[0010] By adopting the above technical solution, the retractable drill teeth are designed to be retractable. When the drill assembly is in the hole for normal drilling operation, the drill teeth are in an extended state. When the operation is completed and the drill assembly needs to be pulled upward, the free end of the drill tooth touches the inner wall of the precast concrete pipe section, and then the free end of the drill tooth swings to achieve a certain degree of retraction, so that the drill assembly can be pulled out of the drill hole.

[0011] Furthermore, the mud circulation system includes a slurry outlet pipe and a slurry inlet hose, the slurry inlet hose is fixed to the drilling port, and the slurry outlet pipe includes n detachably connected pipe sections, and the pipe section at the lowest end is fixed to the supporting cross frame.

[0012] Furthermore, the lifting mechanism includes a drilling platform supported on the circumference of the drilling port, and the drilling platform is fixed with a winch and a boom bracket;

[0013] A pulley is fixed on the steel socket at the lower end of the precast concrete pipe section at the bottom layer.

[0014] By adopting the above technical solution, the pulley can be used to conveniently control the sinking speed of the bottom precast concrete pipe segment through the winch. At the same time, it can assist in adjusting and adjusting the pressure of the precast concrete pipe segment on the drilling rig to prevent the drill from being stuck due to excessive pressure.

[0015] Furthermore, a limiting roller is provided on the inner side of the drilling rig platform.

[0016] By adopting the above technical solution, there are four limiting rollers located in four different directions, which assist in guiding the precast concrete pipe section to move downward and avoid tilting during the downward movement.

[0017] A construction method of railway overhead support pile drilling equipment comprises the following steps:

[0018] S1. Determine the pile position on the railway shoulder and manually excavate the pile hole to a depth of h≥2.0m;

[0019] S2. A lifting mechanism is fixedly built at the hole mouth, and a mud pit is excavated outside the railway roadbed to prepare mud for use;

[0020] S3. Fix the drilling rig assembly to the bottom end of the first section, i.e., the bottom precast concrete pipe section, and set up the mud circulation system;

[0021] S4. The precast concrete pipe section in S3 is hoisted into the hole through the lifting mechanism, mud is injected into the hole through the mud circulation system, and the drilling assembly starts drilling. As the drilling assembly drills downward, the mud circulation system is used to pump out drilling cuttings while replenishing mud into the hole.

[0022] S5. When the top of the first precast concrete pipe section sinks to 1m from the hole mouth, stop drilling, hoist in a new precast concrete pipe section, connect the slurry outlet pipe in the mud circulation system, and resume drilling. Repeat the operation until the hole reaches the preset depth.

[0023] S6. Remove the drilling rig assembly fixed to the precast concrete pipe section on the bottom layer, and pump concrete into the bottom of the hole to seal the bottom;

[0024] The thickness of the bottom seal is controlled at approximately 1m. The reason for the bottom seal is that it is impossible to use lifting machinery to lift the formed steel cage into the hole on the railway shoulder. It must be manually tied and formed in the hole, which requires the mud in the hole to be drained before the operation can be carried out. To prevent the pressure imbalance at the bottom of the hole after the mud is drained, and the sediment backflow, which would lead to the loss of soil around the pile hole and the collapse of the railway subgrade, affecting driving safety, it is necessary to use concrete for the bottom seal.

[0025] S7. After the bottom seal concrete solidifies, remove the remaining mud in the hole and tie the steel cage from bottom to top in the hole;

[0026] S8. Pump concrete into the steel cage. Once the concrete is pumped in, the construction of the support pile is completed.

[0027] The beneficial effects of the above technical solution of the present invention are as follows:

[0028] 1. The equipment of the present invention is used for construction, which reduces the construction difficulty of railway overhead support piles and uses the mud in the hole to balance the pressure of the soil in the hole, thereby avoiding railway traffic safety accidents caused by hole collapse and surface collapse, thereby improving safety.

[0029] 2. The equipment of the present invention is used for construction, and machinery is used instead of manual labor, which improves construction efficiency and reduces labor costs. At the same time, it avoids the situation in which a large amount of soil is lost from the retaining wall due to the continuous removal of the backflowing sand and soil during manual operation, thereby avoiding the personal injury accidents caused by the collapse of the hole which is common in manual excavation construction. It solves the problem of drilling holes for railway overhead support piles under geological conditions such as high groundwater level, large water volume, silt sand, and mud flow.

[0030] 3. By carrying out construction through the equipment of the present invention, mechanical drilling construction can be implemented without invading the railway building limit, without the need to pump down groundwater, thus avoiding the impact on the railway subgrade and surrounding important buildings and facilities, and ensuring the safety of existing railway equipment and building facilities.

[0031] 4. The drilling rig assembly in the railway overhead support pile drilling equipment of the present invention is convenient for disassembly and installation with respect to the underlying precast concrete pipe section, and the top side of the drill bit is provided with retractable drill teeth, which can meet the drilling construction requirements and does not interfere with the removal of the drilling rig assembly from the drill hole after construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a front view of the railway overhead support pile drilling equipment of the present invention;

[0033] Figure 2 It is a front view of the drill bit of the present invention;

[0034] Figure 3 This is a front view of the L-shaped support bracket and the U-shaped frame connected in the present invention;

[0035] Figure 4 A side view of the L-shaped support bracket and the U-shaped bracket connected in the present invention;

[0036] Figure 5 A top view of the lifting mechanism at the drilling port of the present invention;

[0037] Figure 6 A top view of the limiting roller in the present invention;

[0038] Figure 7 This is one of the schematic diagrams of the construction state in the embodiment;

[0039] Figure 8 This is the second schematic diagram of the construction state in the embodiment;

[0040] Figure 9 Schematic diagram of the prior art.

[0041] 1. Drilling rig assembly; 11. Waterproof motor box; 111. Support cross frame; 112. Drilling rig pull rope; 12. Drill bit; 121. Stop block; 13. Retractable drill teeth; 131. Drill teeth; 132. Stop spring;

[0042] 2. Precast concrete pipe section; 21. L-shaped support frame; 22. U-shaped frame; 221. Limit pin hole; 23. Pin; 24. Lifting wire rope;

[0043] 3. Lifting mechanism; 31. Drilling platform; 32. Winch; 33. Boom support; 34. Pulley; 35. Limit roller;

[0044] 4. Mud circulation system; 41. Mud outlet pipe; 42. Mud inlet hose. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-8 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by ordinary technicians in this field fall within the scope of protection of the present invention.

[0046] like Figure 1-8 As shown: A railway overhead support pile drilling equipment, including a drilling rig assembly 1 for drilling, a precast concrete pipe segment 2 for supporting the inner wall of the drill hole, a lifting mechanism 3 for lifting the precast concrete pipe segment 2, and a mud circulation system 4;

[0047] The drilling rig assembly 1 includes a waterproof motor box 11, in which a waterproof motor is installed. The output shaft of the waterproof motor extends downward and drives a drill bit 12 located below the waterproof motor box 11. The top side of the drill bit 12 is provided with retractable drill teeth 13. The waterproof motor box 11 is detachably fixed to the lower end of the bottom precast concrete pipe section 2.

[0048] Among them, a supporting cross frame 111 is provided on the side wall of the waterproof motor box 11, and an L-shaped supporting bracket 21 is provided at the lower end of the precast concrete pipe section 2 at the bottom layer. A U-shaped frame 22 for clamping the supporting cross frame 111 is provided on the side wall opposite to the waterproof motor box 11. The top of the waterproof motor box 11 is connected to one end of the drilling rig pulling rope 112, and the free end of the drilling rig pulling rope 112 is outside the drill hole.

[0049] Precast concrete pipe segments 2 are used to support the hole wall to prevent the hole from collapsing and affecting railway traffic. Each precast concrete pipe segment 2 is 1 meter long and 10 cm thick. Each precast concrete pipe segment 2 weighs about 1.0 t and uses steel sockets. It is continuously extended and sunk as drilling progresses.

[0050] Among them, the U-shaped frame 22 is provided with a vertical limit pin hole 221, and the end of the supporting cross frame 111 is provided with a through hole corresponding to the limit pin hole 221. After the supporting cross frame 111 is inserted into the U-shaped frame 22, it is limited by the pin 23. The pin 23 is connected to one end of the pulling wire rope 24, and the free end of the pulling wire rope 24 is outside the drilled hole.

[0051] When the waterproof motor box 11 is fixed to the lower end of the bottom precast concrete pipe section 2, it is easy to fix. When the drilling rig assembly 1 needs to be disassembled, only simple operations outside the drilling are required, that is, the lifting wire rope 24 is pulled upward by external force to pull out the pin 23.

[0052] When the waterproof motor box 11 drives the drill bit 12 to rotate, the rotation direction is from the open end of the U-shaped frame 22 to the sealed end, that is, the supporting cross frame 111 is stuck in the U-shaped frame 22, and there is a force directed to the sealed end of the U-shaped frame 22. When the drill assembly 1 needs to be disassembled, after pulling out the pin 23, the drill bit 12 is rotated in the opposite direction to disengage the supporting cross frame 111 from the U-shaped frame 22. Then, the drill assembly 1 can be pulled out of the drill hole through the drill pulling rope 112.

[0053] Among them, the retractable drill tooth 13 includes a drill tooth 131, one end of the drill tooth 131 is hinged to the drill bit 12, and the drill bit 12 is provided with a limit block 121 above the drill tooth 131. A limit tension spring 132 is provided between the drill tooth 131 and the drill bit 12, one end of the limit tension spring 132 is fixed on the drill bit 12, and the other end of the limit tension spring 132 is fixed on the drill tooth 131.

[0054] The retractable drill teeth 13 can be symmetrically arranged in two numbers, and the distance between the free ends of the two drill teeth 131 is the same as the outer ring diameter of the end surface of the precast concrete pipe segment 2 .

[0055] The retractable drill tooth 13 is designed to be retractable. When the drill assembly 1 is in the hole for normal drilling operation, the drill tooth 131 is in an extended state. When the operation is completed and the drill assembly 1 needs to be pulled out, the free end of the drill tooth 131 touches the inner wall of the precast concrete pipe section 2, and then the free end of the drill tooth 131 swings to achieve a certain degree of retraction, so that the drill assembly 1 can be pulled out of the drill hole.

[0056] The mud circulation system 4 includes a slurry outlet pipe 41 and a slurry inlet hose 42 . The slurry inlet hose 42 is fixed to the drilling port. The slurry outlet pipe 41 includes n detachably connected pipe sections, and the pipe section at the lowest end is fixed to the supporting cross frame 111 .

[0057] The slurry outlet pipe 41 and the slurry inlet hose 42 are each connected to a mud pump. The lowest pipe section is fixed to the support crossbeam 111 and can be continuously extended as the drilling rig sinks. Each section of the slurry outlet pipe 41 is 1 meter long and connected to a mud pump at the top to pump out drilling cuttings and mud from the bottom of the hole. The slurry inlet hose 42 is a flexible hose fixed to the hole mouth. The mud pump replenishes mud into the hole to ensure that the mud in the hole is always balanced.

[0058] The lifting mechanism 3 includes a drilling platform 31 supported on the circumference of the drilling port, and a winch 32 and a boom support 33 are fixed to the drilling platform 31;

[0059] The hoisting is achieved by cooperation between the hoist 32 and the boom support 33 , and both the hoist 32 and the boom support 33 are existing equipment.

[0060] A pulley 34 is fixedly provided on the steel socket at the lower end of the precast concrete pipe section 2 at the bottom layer.

[0061] There are two groups of winches 32. Through the action of pulleys 34, it is convenient to control the sinking speed of the bottom precast concrete pipe section 2 through the winch 32 which is different from the hoisting. At the same time, it can assist in adjusting and adjusting the pressure of the precast concrete pipe section 2 on the drilling rig to prevent excessive pressure from causing the drill to get stuck.

[0062] The drilling platform 31 is welded from steel pipes (or steel sections) with a diameter of at least 100 mm and is placed on the railway shoulder and securely supported. If the shoulder is not wide enough to accommodate the drilling platform, a platform can be constructed on the railway embankment slope using stone or concrete, widening the shoulder at the pile location.

[0063] A limiting roller 35 is provided on the inner side of the drilling platform 31 .

[0064] There are four limiting rollers 35 separated in four different directions, which assist in guiding the precast concrete pipe section 2 to move downward to prevent it from tilting during the downward movement.

[0065] A construction method of railway overhead support pile drilling equipment comprises the following steps:

[0066] S1. Determine the pile position on the railway shoulder, temporarily support the railway track bed, and manually excavate the pile hole to a depth of h, where h is 2.0m;

[0067] S2, a lifting mechanism 3 is fixedly built at the hole mouth, and a mud pit is excavated outside the railway roadbed to prepare mud for use;

[0068] S3, fixing the drilling rig assembly 1 to the bottom end of the first section, i.e., the bottom precast concrete pipe section 2, and setting up the mud circulation system 4;

[0069] S4. The precast concrete pipe segment 2 in S3 is hoisted into the hole by the lifting mechanism 3. Mud is injected into the hole by the mud circulation system 4. The drilling assembly 1 starts drilling. As the drilling assembly 1 drills downward, the mud circulation system 4 removes drilling cuttings while replenishing mud into the hole.

[0070] S5. When the top of the first precast concrete pipe segment 2 sinks to a point 1 m from the hole opening, stop drilling, re-insert a new precast concrete pipe segment 2, connect the slurry outlet pipe 41 in the slurry circulation system 4, and resume drilling. Repeat the operation until the hole reaches the preset depth.

[0071] S6. Remove the drilling rig assembly 1 fixed to the bottom precast concrete pipe section 2 and pump concrete into the bottom of the hole to seal the bottom;

[0072] The thickness of the bottom seal is controlled at approximately 1m. This is necessary because the preformed steel cage cannot be hoisted into the hole using cranes on the railway shoulder. Manual tying and shaping is required, which requires draining the slurry from the hole. Concrete is used for the bottom seal to prevent pressure imbalance at the bottom of the hole and sediment backflow after draining the slurry, which could lead to soil loss around the pile hole, subsidence of the railway subgrade, and potentially impact traffic safety.

[0073] S7. After the bottom seal concrete solidifies, remove the remaining mud in the hole and tie the steel cage from bottom to top in the hole;

[0074] S8. Pump concrete into the steel cage. Once the concrete is pumped in, the construction of the support pile is completed.

[0075] In the present invention, unless otherwise clearly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be internal communication between two elements or an interaction relationship between two elements. Unless otherwise clearly specified and limited, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0076] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. Railway overhead support pile drilling equipment, characterized by: It comprises a drilling rig assembly (1) for drilling a hole, a precast concrete pipe segment (2) for supporting the inner wall of the hole, a lifting mechanism (3) for lifting the precast concrete pipe segment (2), and a mud circulation system (4); The drilling rig assembly (1) includes a waterproof motor box (11), wherein a waterproof motor is provided in the waterproof motor box (11), wherein an output shaft of the waterproof motor extends downward and drives a drill bit (12) located below the waterproof motor box (11), wherein a retractable drill tooth (13) is provided on the top side of the drill bit (12), and the waterproof motor box (11) is detachably fixed to the lower end of the bottom precast concrete pipe section (2); A supporting cross frame (111) is provided on the side wall of the waterproof motor box (11), an L-shaped support frame (21) is provided at the lower end of the precast concrete pipe section (2) at the bottom layer, a U-shaped frame (22) for clamping the supporting cross frame (111) is provided on the side wall of the L-shaped support frame (21) opposite to the waterproof motor box (11), the top of the waterproof motor box (11) is connected to one end of a drilling rig pulling rope (112), and the free end of the drilling rig pulling rope (112) is outside the drill hole; The U-shaped frame (22) is provided with a vertical limit pin hole (221), and the end of the supporting cross frame (111) is provided with a through hole corresponding to the limit pin hole (221). After the supporting cross frame (111) is inserted into the U-shaped frame (22), it is limited by a pin (23). The pin (23) is connected to one end of a pulling wire rope (24), and the free end of the pulling wire rope (24) is outside the drilled hole. The retractable drill tooth (13) comprises a drill tooth (131), one end of the drill tooth (131) is hinged to the drill bit (12), a limit block (121) is provided on the drill bit (12) and is located above the drill tooth (131), a limit tension spring (132) is provided between the drill tooth (131) and the drill bit (12), one end of the limit tension spring (132) is fixed to the drill bit (12), and the other end of the limit tension spring (132) is fixed to the drill tooth (131).

2. The railway overhead support pile drilling equipment according to claim 1, characterized in that: The mud circulation system (4) comprises a slurry discharge pipe (41) and a slurry inlet hose (42), wherein the slurry inlet hose (42) is fixed to the borehole port, and the slurry discharge pipe (41) comprises n detachably connected pipe sections, wherein the pipe section at the lowest end is fixed to the supporting cross frame (111).

3. The railway overhead support pile drilling equipment according to claim 1, characterized in that: The lifting mechanism (3) comprises a drilling platform (31) supported on the circumference of the drilling port, and the drilling platform (31) is fixedly provided with a winch (32) and a boom bracket (33); A pulley (34) is fixedly provided on the steel socket at the lower end of the precast concrete pipe section (2) at the bottom layer.

4. The railway overhead support pile drilling equipment according to claim 3, characterized in that: A limiting roller (35) is provided on the inner side of the drilling platform (31).

5. A construction method for the railway overhead support pile drilling equipment according to any one of claims 1 to 4, characterized in that: The following steps are included: S1. Determine the pile position on the railway shoulder and manually excavate the pile hole to a depth of h, where h ≥ 2.0m; S2, a lifting mechanism (3) is fixedly built at the hole mouth, and a mud pit is excavated outside the railway roadbed to prepare mud for use; S3, fixing the drilling rig assembly (1) to the bottom end of the first section, i.e., the bottom precast concrete pipe section (2), and setting up a mud circulation system (4); S4, hoisting the precast concrete pipe section (2) in S3 into the hole through the lifting mechanism (3), injecting mud into the hole through the mud circulation system (4), and starting the drilling assembly (1) to drill the hole. When the drilling assembly (1) drills downward, the mud circulation system (4) extracts the drilling cuttings while replenishing the mud into the hole; S5. When the first precast concrete pipe section (2) sinks to a position 1 m from the hole opening, stop drilling, re-insert a new precast concrete pipe section (2), and simultaneously connect the slurry outlet pipe (41) in the slurry circulation system (4). Then resume drilling and repeat the operation until the hole reaches the preset depth. S6, remove the drilling rig assembly (1) fixed on the bottom precast concrete pipe section (2), and pump concrete into the bottom of the hole to seal the bottom; S7. After the bottom seal concrete solidifies, remove the remaining mud in the hole and tie the steel cage from bottom to top in the hole; S8. Pump concrete into the steel cage. Once the concrete is pumped in, the construction of the support pile is completed.

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