Hammer buried casing device and construction method thereof

Abstract

The present invention relates to a hammer buried casing device and a construction method thereof, comprising an outer casing arranged vertically and an inner casing coaxial with the outer casing and arranged inside the outer casing; a top plate is vertically fixedly arranged on the outer side of the top of the inner casing, the bottom of the top plate abuts against the top of the outer casing, and an inner pile tip is fixedly arranged on the bottom of the inner casing; the present invention utilizes the torque of a rotary drilling rig to apply a pressure to the connecting casing on the inner casing so that it overcomes the friction between the casing and the soil, and the outer casing is smoothly lowered to a designated position by the downward movement of the top plate, and has the advantages of simple structure, reasonable design, flexible and convenient use, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a hammer buried casing device and a construction method thereof. Background Art

[0002] At present, there are dozens of pile foundations used in various projects. According to different construction processes, the current dominant pile types in my country are bored piles, vibrating bored piles, rammed piles, manually dug piles, prestressed pipe piles, and various flexible and semi-flexible piles for soft foundation treatment (such as cement mixing piles and powder injection piles, high-pressure rotary jet piles, sandstone piles or crushed stone piles). When bored piles are constructed in areas with stone surfaces, hard stones are often encountered, which makes it difficult to drive the steel casing or drill the bored piles. The soil properties are often poor within a certain length range of the bored pile mouth, so steel casings are required to protect the wall and prevent the hole wall from collapsing. When the steel casing is driven into the pile, stones are encountered. Due to the high strength of the stones, the steel casing cannot be lowered to the designed depth normally. If it is forced into the pile, the bottom of the casing cannot be driven in even if the edge is severely curled.

[0003] The common engineering measures for dealing with buried casing sinking are mainly the following:

[0004] Excavation method: when the buried depth of the rocks is shallow, the rocks can be directly excavated and exposed for crushing and removal. However, when the buried depth of the rocks is large or the groundwater is abundant, this method requires the use of foundation pit retaining structure, which is less economical.

[0005] Blasting method: when the steel casing sinks and encounters rocks, the soil inside the steel casing is manually excavated until the rocks are exposed, and blasting holes are drilled on the rocks. Explosives are loaded and then blasted to break the rocks. This method is difficult to control the amount of explosives. Too much explosives may cause the steel casing to deform and disturb the surrounding soil too much. Too little explosives will result in low processing efficiency. In addition, it is extremely difficult to drill blasting holes when working underwater or when there is abundant groundwater.

[0006] In the hole sweeping method, when the steel casing encounters rocks after sinking, a drilling rig is used to remove the isolated rocks. In this case, the bottom of the steel casing often curls during the impact and sinking process, and the drill bit of the drilling rig cannot drill out of the bottom of the casing. Not only can it not drill into and break the rocks, but it is also easy to cause the drill bit of the drilling rig to wear. Even if the bottom of the steel casing does not curl or deform, the gap between the steel casing and the drilling rig causes incomplete processing of the rocks, and the steel casing is difficult to follow up and sink.

[0007] In short, the above types of buried casings always have problems in terms of casing quality, impact on the surrounding environment and buildings, construction safety and project cost. In recent years, the introduction of foreign technology has introduced full-casing rotary bored piles.

[0008] As for pile drivers, although rotary drilling rigs have improved efficiency, they have the disadvantages of easily losing the drill bit when working in high-density clay or being unable to drill into hard rocks. Moreover, these devices are expensive, the construction cost is extremely high, and the overall effectiveness is not high.

[0009] In view of the above problems, it is necessary to improve them. Summary of the invention

[0010] The present invention aims to overcome the defects in the prior art and provide a hammering casing embedding device which can reduce the damage to the casing and the pressing device when embedding the casing and has a simple structure and is flexible and convenient to use.

[0011] In order to achieve the above purpose, the technical solution adopted by the present invention is: a hammer burying casing device, including a vertically arranged outer casing and an inner casing coaxial with the outer casing and arranged inside the outer casing; a top plate is vertically fixed to the outer side of the top of the inner casing, the bottom of the top plate is abutted against the top of the outer casing, and an inner pile tip is fixed to the bottom of the inner casing.

[0012] As a preferred solution of the present invention, a connecting casing is fixedly provided on the top plate, a connecting top plate is fixedly provided on the top of the connecting casing, a plurality of triangular support plates are fixedly provided on the bottom of the connecting casing, and the bottom of the triangular support plates is fixedly provided on the top plate.

[0013] As a preferred solution of the present invention, a plurality of upper support plates are fixedly provided at the connection between the bottom of the top plate and the inner casing, and the upper support plates are equidistantly arranged between the inner casing and the outer casing.

[0014] As a preferred solution of the present invention, the upper support plate includes a horizontal section and an inclined section, the inclined surface of the inclined section gradually decreases in inclination from the outside to the inside; the length of the horizontal section is 1 / 2 of the length of the inclined section.

[0015] As a preferred solution of the present invention, the bottom of the outer casing is a downward pointed spike portion; the inclination angle of the spike portion is consistent with the inclination angle of the pile head of the inner pile tip.

[0016] As a preferred solution of the present invention, the inner pile tip comprises a body, a support block assembled on the outside of the body, the support block and the body are fixedly connected and integrally formed; the body is a hollow cone cast by steel.

[0017] As a preferred solution of the present invention, a gap is left between the support block and the inner casing.

[0018] As a preferred solution of the present invention, a plurality of steel block buckles are vertically fixed on the support block, the outer sides of the steel block buckles are on the same vertical plane as the support block, and the inner sides of the steel block buckles are against the inner casing.

[0019] As a preferred solution of the present invention, a plurality of lower support plates are fixedly provided on the steel block buckle, the lower support plates are in the shape of a right-angled triangle, the lower support plates are perpendicular to the outer wall of the inner casing, and the bottom length of the lower support plates is consistent with the length of the steel block buckle.

[0020] As a preferred solution of the present invention, the surface of the inner pile tip is coated with an anti-oxidation material layer.

[0021] A construction method for hammering and burying a casing device comprises the following steps:

[0022] Step 1: Construction preparation: fully prepare the equipment, tools and objects needed for construction, level and compact the construction site, clean up debris, remove soft soil, and measure and mark the center position of the pile;

[0023] Step 2: Put the drilling rig in place, move the drilling rig to the casing device, and install and adjust it, align the drill bit with the center of the connecting top plate, check the drilling rig as a whole, and eliminate the fault in time;

[0024] Step 3: hammer the assembled outer casing, inner casing, inner pile tip and connecting casing into the foundation through a drilling rig;

[0025] Step 4: Sink the outer casing and the inner casing to the designed elevation;

[0026] Step 5: Pull out the inner casing by high-frequency vibration or hydraulic pile puller.

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention uses the torque of the rotary drilling rig to apply a pressure to the connecting casing on the inner casing, so that it overcomes the friction between the inner casing and the soil, and the outer casing is smoothly lowered to the designated position by the downward movement of the top plate. It has the advantages of simple structure, reasonable design, flexible and convenient use, etc.

[0029] 2. The hammering device of the hammering casing embedding device of the present invention is a flat plate vibrator with a power of 1.5kw and a frequency of 2800 rpm, which can effectively control the stability and verticality of the inner casing during the vibration pipe sinking process; the connection between the flat plate vibrator and the connecting top plate adopts a flange connection, which has the characteristics of no need for welding, convenient operation, low cost and improved efficiency;

[0030] 3. The inner casing, top plate, connecting casing and connecting top plate of the present invention are connected by welding, which can be directly welded on site, is easy to process, has low cost, and has strong adaptability. It is suitable for various underground environments and can well ensure the connection strength;

[0031] 4. The present invention is provided with a connecting casing, so that it can be conveniently determined that the inner casing is installed below the ground and the upper end is flush with the ground, and when the inner casing is pulled out, the lower end of the crane can be clamped on the connecting casing to avoid damage to the inner casing, so that the inner casing can be recycled and the cost can be reduced;

[0032] 5. The inner pile tip of the present invention has strong penetration, good overall structural performance, strong on-site construction, fast connection, and can better combine the inner pile tip with the inner casing, which is suitable for the needs of different engineering and geological conditions, and greatly improves the construction utilization rate;

[0033] 6. The inner pile tip of the present invention adopts a detachable and rotatable pile tip. The pile tip can be pulled out by rotating after the casing is buried, avoiding the disturbance of the soil body by the pile tip remaining in the soil body in the past, and effectively simulating the densification effect on the soil body between the piles. The device of the present invention is easy to operate, makes the test more in line with the actual working conditions, and reduces the workload of the test personnel;

[0034] 7. The bottom of the outer casing of the present invention is a downward pointed spike; the inclination angle of the spike is consistent with the inclination angle of the pile head of the inner pile tip; so that the outer casing can be better connected with the ground during the hammering of the inner pile tip by the drilling rig, reducing the contact area between the bottom of the outer casing and the foundation, and facilitating the downward pushing efficiency of the outer casing;

[0035] 8. The present invention reduces the friction when pulling out the inner casing by providing the lower support plate and the upper support plate, thereby improving the working efficiency;

[0036] 9. The present invention provides an anti-oxidation material layer on the surface of the inner pile tip to prevent the inner pile tip from being oxidized when buried underground for a long time;

[0037] 10. The present invention vertically fixes a plurality of steel block buckles on the support block, and fixes a plurality of lower support plates on the steel block buckles, thereby improving the connection strength and overall firmness between the inner casing and the inner pile tip, so that the inner casing can be easily pulled out;

[0038] 11. The outer casing and the inner casing of the present invention are both made of Q235 steel material. In this way, the inner casing and the outer casing are both made of Q235 steel material; Q235 steel, Q represents the yield limit of this material, and the following 235 refers to the yield value of this material, which is about 235MPa. And the yield value will decrease with the increase of the thickness of the material. Due to the moderate carbon content, the comprehensive performance is good, and the strength, plasticity and welding properties are well matched, and it has the widest range of uses. Therefore, Q235 steel material is selected to process and manufacture the inner casing and the outer casing to reduce costs, and the raw materials are easy to obtain;

[0039] 12. The outer casing of the present invention has a wall thickness of 10mm or 12mm, which can avoid the adverse effects of curling and edge wrapping defects on the construction process. The inner casing can be pulled out smoothly, which is convenient for recycling and reduces costs; BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0041] Figure 2 It is a partial enlarged view of the embodiment A of the present invention;

[0042] Figure 3 It is a partial enlarged view of the B direction of the embodiment of the present invention;

[0043] Description of the drawings: outer casing 1, inner casing 2, top plate 3, inner pile tip 4, connecting casing 5, connecting top plate 6, triangular support plate 7, steel block buckle 8, lower support plate 9, upper support plate 10, horizontal section 11, inclined section 12, main body 40, support block 41. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Example:

[0047] like Figure 1-3 As shown, a casing embedding device provided by the present embodiment comprises an outer casing 1 arranged vertically and an inner casing 2 coaxial with the outer casing 1 and arranged inside the outer casing 1; a top plate 3 is vertically fixedly arranged on the outer side of the top of the inner casing 2, the bottom of the top plate 3 abuts against the top of the outer casing 1, and an inner pile tip 4 is fixedly arranged on the bottom of the inner casing 2;

[0048] Specifically, the outer casing and the inner casing of the present invention are both made of Q235 steel material. In this way, the inner casing and the outer casing are both made of Q235 steel material; Q235 steel, Q represents the yield limit of this material, and the following 235 refers to the yield value of this material, which is about 235MPa. And the yield value will decrease with the increase of the thickness of the material. Due to the moderate carbon content, the comprehensive performance is good, and the strength, plasticity and welding properties are well matched, and the use is the most extensive. Therefore, Q235 steel material is selected to process and manufacture the inner casing and the outer casing, which reduces the cost, and the raw materials are easy to obtain.

[0049] The outer casing wall is 10mm or 12mm thick, which can avoid the adverse effects of curling and edge defects on the construction during the construction process. The inner casing can be pulled out smoothly, which is convenient for recycling and reduces costs.

[0050] The present invention utilizes the torque of the rotary drilling rig to apply a pressure to the connecting casing on the inner casing so that it overcomes the friction between the inner casing and the soil, and the outer casing is smoothly lowered to the designated position by the downward movement of the top plate. The present invention has the advantages of simple structure, reasonable design, flexible and convenient use, etc.

[0051] A connecting casing 5 is fixed on the top plate 3, a connecting top plate 6 is fixed on the top of the connecting casing 5, a plurality of triangular support plates 7 are fixed on the bottom of the connecting casing 5, and the bottom of the triangular support plate 7 is fixed on the top plate 3; the present invention is provided with a connecting casing 5, so that it can be convenient to ensure that the inner casing is installed below the ground and the upper end is flush with the ground, and when the inner casing is pulled out, the lower end of the crane can be clamped on the connecting casing to avoid damage to the inner casing, so that the inner casing can be recycled and the cost is reduced;

[0052] The hammering device of the hammering casing embedding device of the present invention is a flat plate vibrator, which has a power of 1.5kw and a frequency of 2800 rpm, and can effectively control the stability and verticality of the inner casing during the vibration pipe sinking process; the connection between the flat plate vibrator and the connecting top plate adopts a flange connection, which has the characteristics of no need for welding, convenient operation, low cost and improved efficiency;

[0053] A plurality of upper support plates 10 are fixedly provided at the connection between the bottom of the top plate 6 and the inner casing 2, and the upper support plates 10 are equidistantly arranged between the inner casing 2 and the outer casing 1; correspondingly, a lower support plate 9 is fixedly provided at the bottom of the inner casing 2. By arranging the lower support plates and the upper support plates, the present invention reduces the friction when pulling out the inner casing and improves the work efficiency.

[0054] The upper support plate 10 includes a horizontal section 11 and an inclined section 12. The inclined surface of the inclined section 12 gradually decreases from the outside to the inside. The length of the horizontal section 11 is 1 / 2 of the length of the inclined section 12. The inner casing, top plate, connecting casing and connecting top plate of the present invention are connected by welding and can be directly welded on site. It is easy to process, low in cost, and has strong adaptability. It is suitable for various underground environments and can well ensure the connection strength.

[0055] The bottom of the outer casing 1 is a downward pointed spike portion 20; the inclination angle of the spike portion 20 is consistent with the inclination angle of the pile head of the inner pile tip 4; so that the outer casing and the ground can be better connected during the hammering of the inner pile tip by the drilling rig, reducing the contact area between the bottom of the outer casing and the foundation, and facilitating the downward propulsion efficiency of the outer casing.

[0056] The inner pile tip 4 comprises a body 40 and a support block 41 assembled on the outside of the body 40. The support block 41 is fixedly connected to the body 40 and formed as one piece. The body 40 is a hollow cone cast by cast steel. The inner pile tip of the present invention has strong penetrating power, good overall structural performance, strong on-site construction performance, fast connection, and can better combine the inner pile tip with the inner casing, so it is suitable for the needs of different engineering and geological conditions, and greatly improves the construction utilization rate.

[0057] The inner pile tip of the present invention adopts a detachable rotatable pile tip, and the pile tip can be pulled out by rotation after the casing is buried, avoiding the disturbance of the soil by the pile tip remaining in the soil in the past, and effectively simulating the densification effect on the soil between piles. The device of the present invention is easy to operate, makes the test more in line with actual working conditions, and reduces the workload of test personnel.

[0058] A plurality of steel block buckles 8 are vertically fixed on the support block 41, the outer side of the steel block buckle 8 is on the same vertical plane as the support block 41, and the inner side of the steel block buckle 8 is against the inner casing 2. A gap is left between the support block 41 and the inner casing 2; a plurality of lower support plates 9 are fixed on the steel block buckle 8, the lower support plates 9 are in the shape of a right triangle, the lower support plates 9 are perpendicular to the outer wall of the inner casing 2, and the length of the bottom of the lower support plates 9 is consistent with the length of the steel block buckle 8; the above technical solution improves the connection strength and overall firmness between the inner casing and the inner pile tip, so that the inner casing can be easily pulled out.

[0059] The surface of the inner pile tip 4 is coated with an anti-oxidation material layer to prevent the inner pile tip from being buried underground for a long time and causing oxidation;

[0060] A construction method for hammering and burying a casing device comprises the following steps:

[0061] Step 1: Construction preparation: fully prepare the equipment, tools and objects needed for construction, level and compact the construction site, clean up debris, remove soft soil, and measure and mark the center position of the pile;

[0062] Step 2: Put the drilling rig in place, move the drilling rig to the casing device, and install and adjust it so that the drill bit is aligned with the center of the connecting top plate 6, check the drilling rig as a whole, and eliminate the fault in time;

[0063] Step 3: hammer the assembled outer casing 1, inner casing 2, inner pile tip 4 and connecting casing 5 into the foundation by drilling;

[0064] Step 4: Sink the outer casing 1 and the inner casing 2 to the designed elevation;

[0065] Step 5: Pull out the inner casing 2 by high-frequency vibration or a hydraulic pile puller.

[0066] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0067] Although the following terms are used more frequently in this article: outer casing 1, inner casing 2, top plate 3, inner pile tip 4, connecting casing 5, connecting top plate 6, triangular support plate 7, steel block buckle 8, lower support plate 9, upper support plate 10, horizontal section 11, inclined section 12, body 40, support block 41, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A casing embedding device by hammering, comprising an outer casing (1) arranged vertically and an inner casing (2) coaxial with the outer casing (1) and arranged inside the outer casing (1); characterized in that: A top plate (3) is vertically fixed to the outer side of the top of the inner casing (2), the bottom of the top plate (3) is in contact with the top of the outer casing (1), and an inner pile tip (4) is fixed to the bottom of the inner casing (2); a connecting casing (5) is fixed to the top plate (3), a connecting top plate (6) is fixed to the top of the connecting casing (5), a plurality of triangular support plates (7) are fixed to the bottom of the connecting casing (5), and the bottom of the triangular support plates (7) are fixed to the top plate (3); the inner casing is installed below the ground with the upper end flush with the ground, and when the inner casing is pulled out, the lower end of the crane is clamped on the connecting casing; a plurality of upper support plates (10) are fixed to the connection between the bottom of the connecting top plate (6) and the inner casing (2), and the upper support plates (10) are equidistantly arranged between the inner casing (2) and the outer casing (1); a lower support plate (9) is fixed to the bottom of the inner casing (2).

2. A casing embedding device by hammering according to claim 1, characterized in that: The upper support plate (10) comprises a horizontal section (11) and an inclined section (12); the inclined surface of the inclined section (12) gradually decreases in inclination from the outside to the inside; the length of the horizontal section (11) is 1 / 2 of the length of the inclined section (12).

3. A casing embedding device by hammering according to claim 1, characterized in that: The bottom of the outer casing (1) is a downward pointed spike portion (20); the inclination angle of the pointed spike portion (20) is consistent with the inclination angle of the pile head of the inner pile tip (4).

4. A device for embedding casing by hammering according to claim 3, characterized in that: The inner pile tip (4) comprises a body (40), a support block (41) mounted on the outside of the body (40), the support block (41) and the body (40) being fixedly connected and integrally formed; the body (40) is a hollow cone cast by steel casting.

5. A casing embedding device by hammering according to claim 4, characterized in that: A gap is left between the support block (41) and the inner casing (2).

6. A casing embedding device by hammering according to claim 5, characterized in that: A plurality of steel block buckles (8) are vertically fixedly mounted on the support block (41), the outer sides of the steel block buckles (8) are on the same vertical plane as the support block (41), and the inner sides of the steel block buckles (8) abut against the inner casing (2).

7. A casing embedding device by hammering according to claim 6, characterized in that: A plurality of lower support plates (9) are fixedly arranged on the steel block buckle (8). The lower support plates (9) are in the shape of a right triangle. The lower support plates (9) are perpendicular to the outer wall of the inner casing (2). The length of the bottom of the lower support plates (9) is consistent with the length of the steel block buckle (8).

8. A construction method for hammering and embedding casing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Construction preparation: prepare the equipment, tools and objects needed for construction and level the construction site. Compact and clean up debris, remove soft soil, and measure and mark the center position of the pile; Step 2: The drilling rig is positioned. The drilling rig is moved to the casing device and installed and adjusted so that the drill bit is aligned with the center of the connecting top plate (6). The drilling rig is inspected as a whole and any faults are promptly eliminated. Step 3: driving the assembled outer casing (1), inner casing (2), inner pile tip (4) and connecting casing (5) into the foundation by means of a drilling rig and hammer; Step 4: Sink the outer casing (1) and the inner casing (2) to the designed elevation; Step 5: Pull out the inner casing (2) by high-frequency vibration or hydraulic pile pulling machine.

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