阅读说明：本技术 一种锤击埋设护筒装置及其施工方法 (Hammering embedding pile casing device and construction method thereof ) 是由 陈利 沈琴琴 华汉军 于 2020-06-03 设计创作，主要内容包括：本发明涉及一种锤击埋设护筒装置及其施工方法,包括竖向设置的外护筒和与所述外护筒同轴且设置在所述外护筒内的内护筒；所述内护筒的顶部外侧垂直固设有顶板,顶板底部与外护筒顶部相抵接,内护筒底部固设有内桩尖；本发明利用旋挖钻机的扭矩给内护筒上的连接护筒施加一个压力,使其克服与土壤之间摩擦力,通过顶板的向下移动将外护筒顺利的下放至指定位置,具有结构简单,设计合理,使用灵活方便等优势。(The invention relates to a hammering embedding pile casing device and a construction method thereof, wherein the hammering embedding pile casing device comprises an outer pile casing which is vertically arranged and an inner pile casing which is coaxial with the outer pile casing and is arranged in the outer pile casing; a top plate is vertically and fixedly arranged on the outer side of the top of the inner protecting cylinder, the bottom of the top plate is abutted against the top of the outer protecting cylinder, and an inner pile tip is fixedly arranged at the bottom of the inner protecting cylinder; according to the invention, the torque of the rotary drilling rig is utilized to apply a pressure to the connecting protection cylinder on the inner protection cylinder, so that the friction force between the connecting protection cylinder and the soil is overcome, and the outer protection cylinder is smoothly lowered to the designated position through the downward movement of the top plate.)

1. A hammering embedding pile casing device comprises an outer pile casing (1) which is vertically arranged and an inner pile casing (2) which is coaxial with the outer pile casing (1) and is arranged in the outer pile casing (1); the method is characterized in that: the top outer side of the inner pile casing (2) is vertically and fixedly provided with a top plate (3), the bottom of the top plate (3) is abutted against the top of the outer pile casing (1), and the bottom of the inner pile casing (2) is fixedly provided with an inner pile tip (4).

2. A hammering embedding casing device according to claim 1, characterized in that: the roof (3) is fixedly provided with a connecting protective cylinder (5), the top of the connecting protective cylinder (5) is fixedly provided with a connecting roof (6), the bottom of the connecting protective cylinder (5) is fixedly provided with a plurality of triangular supporting plates (7), and the bottom of each triangular supporting plate (7) is fixedly arranged on the roof (3).

3. A hammering embedding casing device according to claim 2, characterized in that: the joint of the bottom of the top plate (6) and the inner protective cylinder (2) is fixedly provided with a plurality of upper supporting plates (10), and the upper supporting plates (10) are equidistantly distributed between the inner protective cylinder (2) and the outer protective cylinder (1).

4. A hammering embedding casing device according to claim 3, characterized in that: the upper supporting plate (10) comprises a horizontal section (11) and an inclined section (12), and the inclined surface of the inclined section (12) is gradually reduced and inclined from the outer side to the inner side; the length of the horizontal section (11) is 1/2 of the length of the inclined section (12).

5. A hammering embedding casing device according to claim 1, 2 or 3, characterized in that: the bottom of the outer protective cylinder (1) is provided with a downward spike part (20); the inclination angle of the spike part (20) is consistent with the inclination angle of the pile head of the inner pile tip (4).

6. A hammering embedding casing device according to claim 5, characterized in that: the inner pile tip (4) comprises a body (40) and a supporting block (41) assembled on the outer side of the body (40), wherein the supporting block (41) is fixedly connected with the body (40) and is integrally formed; the body (40) is a hollow cone cast by pouring steel.

7. A hammering embedding casing device according to claim 6, characterized in that: a gap is reserved between the supporting block (41) and the inner protection barrel (2).

8. A hammering embedding casing device according to claim 7, characterized in that: a plurality of steel block buckles (8) are vertically and fixedly arranged on the supporting block (41), the outer sides of the steel block buckles (8) and the supporting block (41) are on the same vertical plane, and the inner sides of the steel block buckles (8) are abutted to the inner protective cylinder (2).

9. A hammering embedding casing device according to claim 8, characterized in that: a plurality of lower supporting plates (9) are fixedly arranged on the steel block buckle (8), the lower supporting plates (9) are in a right-angled triangular shape, the lower supporting plates (9) are perpendicular to the outer side wall of the inner protective cylinder (2), and the bottom length of the lower supporting plates (9) is consistent with that of the steel block buckle (8).

10. A construction method for a hammering embedding casing device according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:

firstly, construction preparation, namely fully preparing equipment, tools and objects required by construction, flatly compacting a construction site, cleaning sundries, removing soft soil and measuring the central position of a pile position;

secondly, the drilling machine is in place, the drilling machine is moved to the position of the cylinder protecting device and is installed and adjusted, so that the drill bit is aligned to the center of the connecting top plate (6), the drilling machine is integrally checked, and faults are timely eliminated;

thirdly, hammering the assembled outer pile casing (1), inner pile casing (2), inner pile tip (4) and connecting pile casing (5) into the foundation through a drilling machine;

sinking the outer protective cylinder (1) and the inner protective cylinder (2) to a designed elevation;

and fifthly, the inner protective sleeve (2) is pulled out through high-frequency vibration or hydraulic pile extractor.

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to a hammering embedding pile casing device and a construction method thereof.

Background

At present, the number of pile foundations used in various projects is dozens, and according to different construction processes, the current leading pile types in China are divided into a bored pile, a vibrating bored pile, a rammed pile, a manual hole digging pile, a prestressed pipe pile, various flexible semi-flexible piles (such as a cement mixing pile and a powder spraying pile, a high-pressure rotary spraying pile, a sand pile or a gravel pile) for soft foundation treatment and the like; when the construction of the bored pile is carried out in the area with the stone on the surface, the stone with higher hardness is often encountered, so that the steel casing is driven into the bored pile or the bored pile is difficult to form the hole. The soil body property of the mouth of the drilled pile is poor in a certain length range, so that a steel casing is required to be used for protecting the wall, and the hole wall is prevented from collapsing. The steel protects a section of thick bamboo and squeezes in-process and meet the stone, because stone intensity is higher, cause the steel to protect a section of thick bamboo and can't normally transfer to the design degree of depth, if insert by force and beat, often protect a section of thick bamboo end opening even the turn-up is serious also can't continue to squeeze in.

The common engineering measures for treating the sinking of the embedded pile casing mainly comprise the following measures:

the excavation method can directly excavate the stone and remove the exposed stone after the stone is excavated when the buried depth of the stone is shallow. However, when the buried depth of the stone block is large or underground water is abundant, the method needs to adopt a foundation pit support structure, and the economy is poor.

And in the blasting method, after the steel casing sinks and meets the stone, the soil in the steel casing is manually excavated until the stone is exposed, blasting holes are drilled on the stone, and the stone is blasted after explosive is filled. The method has the advantages that the medicine loading is difficult to control, the steel casing can deform when the medicine loading is too large, meanwhile, the disturbance on the peripheral soil body is too large, and the treatment efficiency is low when the medicine loading is too small. In addition, it is very difficult to drill blast holes in underwater construction or when underground water is abundant.

According to the hole sweeping method, after the steel casing sinks and meets the stone, the boulder is removed by the pore-forming drill, under the condition, the steel casing often impacts the bottom curling edge in the sinking process, and the drill bit of the pore-forming drill cannot drill out the lower bottom opening of the casing, so that the stone cannot be drilled and broken, and the drill bit of the drill is easy to wear. Even if the bottom of the steel pile casing is not curled and deformed, the steel pile casing is difficult to follow and sink due to incomplete treatment of stones caused by the gap between the steel pile casing and the pore-forming drilling machine.

In short, the above various embedded casings always have such or other problems in terms of casing quality, influence on surrounding environment and buildings, construction safety, construction cost and the like. In recent years, the full-casing rotary digging cast-in-place pile is promoted by introducing foreign technologies,

for a pile machine, the rotary drilling improves the efficiency, but has the defect that a drill bit is easy to drop when the rotary drilling is in high-density clay construction or the rotary drilling cannot be carried out when hard rocks are encountered; and the equipment is expensive, the construction cost is extremely high, and the comprehensive efficacy is not high.

In view of the above problems, it is necessary to improve them.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a hammering embedding casing protection device which can reduce the damage degree of a casing and a pressing device when the casing is embedded, has a simple structure, and is flexible and convenient to use.

In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a hammering embedding pile casing device comprises an outer pile casing and an inner pile casing, wherein the outer pile casing is vertically arranged, and the inner pile casing is coaxial with the outer pile casing and is arranged in the outer pile casing; the top outside of interior casing sets firmly the roof perpendicularly, and the roof bottom is protected section of thick bamboo top looks butt with outer, and interior casing bottom sets firmly interior stake point.

As a preferred scheme of the invention, the top plate is fixedly provided with the connecting protection cylinder, the top of the connecting protection cylinder is fixedly provided with the connecting top plate, the bottom of the connecting protection cylinder is fixedly provided with the triangular support plates, and the bottoms of the triangular support plates are fixedly arranged on the top plate.

As a preferable scheme of the invention, a plurality of upper supporting plates are fixedly arranged at the connecting part of the bottom of the top plate and the inner protective cylinder, and the upper supporting plates are equidistantly distributed between the inner protective cylinder and the outer protective cylinder.

As a preferable scheme of the present invention, the upper supporting plate includes a horizontal section and an inclined section, and an inclined surface of the inclined section is gradually inclined from the outer side to the inner side; the horizontal segment length is 1/2 the length of the inclined segment.

As a preferable scheme of the invention, the bottom of the outer protective cylinder is a downward spine part; the inclination angle of the spine part is consistent with the inclination angle of the pile head of the inner pile tip.

As a preferred scheme of the invention, the inner pile tip comprises a body and a supporting block assembled at the outer side of the body, wherein the supporting block is fixedly connected with the body and integrally formed; the body is a hollow cone cast by casting steel.

In a preferred embodiment of the present invention, a gap is left between the support block and the inner sheath.

As a preferred scheme of the invention, a plurality of steel block buckles are vertically and fixedly arranged on the supporting block, the outer sides of the steel block buckles and the supporting block are on the same vertical plane, and the inner sides of the steel block buckles are propped against the inner protective cylinder.

As a preferable scheme of the invention, a plurality of lower supporting plates are fixedly arranged on the steel block buckle, the lower supporting plates are in a right-angled triangle shape, the lower supporting plates are perpendicular to the outer side wall of the inner protective cylinder, and the length of the bottom of each lower supporting plate is consistent with that of the steel block buckle.

In a preferable scheme of the invention, the surface of the inner pile tip is coated with an oxidation resistant material layer.

A construction method for hammering embedded pile casing device comprises the following steps:

firstly, construction preparation, namely fully preparing equipment, tools and objects required by construction, flatly compacting a construction site, cleaning sundries, removing soft soil and measuring the central position of a pile position;

secondly, the drilling machine is in place, the drilling machine is moved to the position of the cylinder protecting device and is installed and adjusted, so that the drill bit is aligned to the center of the connecting top plate, the drilling machine is integrally checked, and faults are timely eliminated;

thirdly, hammering the assembled outer pile casing, inner pile tip and connecting pile casing into the foundation through a drilling machine;

sinking the outer protective cylinder and the inner protective cylinder to a designed elevation;

and fifthly, pulling out the inner protective sleeve through high-frequency vibration or hydraulic pile extractor.

The invention has the beneficial effects that:

1. according to the invention, the torque of the rotary drilling rig is utilized to apply a pressure to the connecting protection cylinder on the inner protection cylinder, so that the friction force between the connecting protection cylinder and the soil is overcome, and the outer protection cylinder is smoothly lowered to the designated position through the downward movement of the top plate, so that the rotary drilling rig has the advantages of simple structure, reasonable design, flexibility and convenience in use and the like;

2. the hammering device of the hammering embedding casing protection device is a flat plate vibrator, the power of the flat plate vibrator is 1.5kw, the frequency is 2800 r/min, and the stability and the verticality of the inner casing protection device in the pipe sinking process can be effectively controlled; the flat vibrator is connected with the connecting top plate by adopting flange connection, and the flat vibrator has the characteristics of no need of welding, convenient operation, low cost and efficiency improvement;

3. the inner protective cylinder, the top plate, the connecting protective cylinder and the connecting top plate are connected by welding, so that the inner protective cylinder and the top plate can be directly welded on site, are convenient to process, have low cost and strong adaptability, are suitable for various underground environments, and can well ensure the connecting strength;

4. the connecting protection cylinder is arranged, so that the inner protection cylinder can be conveniently determined to be arranged below the ground, the upper end of the inner protection cylinder is flush with the ground, the lower end of the crane can be clamped on the connecting protection cylinder when the inner protection cylinder is pulled out, the inner protection cylinder is prevented from being damaged, the inner protection cylinder can be recycled, and the cost is reduced;

5. the inner pile tip has strong penetrating power, good integral structure, strong site construction and quick connection, can better combine the inner pile tip and the inner protective cylinder together, is suitable for the requirements of different projects and geological conditions, and greatly improves the construction utilization rate;

6. the detachable rotary pile point is selected as the inner pile point, and the pile point can be pulled out through rotation after the pile casing is embedded, so that the disturbance of the soil body left by the pile point in the past is avoided, the encryption effect on the soil body among the piles is effectively simulated, the device is easy to operate, the test is more in line with the actual working condition, and the workload of test personnel is reduced;

7. the bottom of the outer protective cylinder is provided with a downward spine part; the inclination angle of the spine part is consistent with the inclination angle of the pile head of the inner pile tip; during the hammering process of the over-drilling machine, the outer protective cylinder can be better connected with the ground, the contact area between the bottom of the outer protective cylinder and the foundation is reduced, and the downward propelling efficiency of the outer protective cylinder is facilitated;

8. according to the invention, the lower supporting plate and the upper supporting plate are arranged, so that the friction force when the inner protective cylinder is pulled out is reduced, and the working efficiency is improved;

9. the surface of the inner pile tip is coated with the anti-oxidation material layer, so that the inner pile tip is prevented from being buried underground for a long time to generate oxidation;

10. according to the invention, the plurality of steel block buckles are vertically and fixedly arranged on the supporting block, and the plurality of lower supporting plates are fixedly arranged on the steel block buckles, so that the connection strength and the integral firmness of the inner protecting cylinder and the inner pile tip are improved, and the inner protecting cylinder can be easily pulled out;

11. the outer protecting cylinder and the inner protecting cylinder are both made of Q235 steel materials, so that the inner protecting cylinder and the outer protecting cylinder are both made of Q235 steel materials; q235 steel, Q stands for the yield limit of the material, and the later 235 refers to the yield value of the material, which is about 235 MPa. The yield value of the material is reduced along with the increase of the thickness of the material, and the carbon-containing composite material has moderate carbon content, good comprehensive performance, good matching of strength, plasticity, welding and other performances and wide application. Therefore, the inner protective cylinder and the outer protective cylinder are made of Q235 steel materials, the cost is reduced, and the raw materials are easy to obtain;

12. the wall of the outer protecting cylinder is 10mm or 12mm thick, so that the adverse effect of the defects of edge curling and edge covering of the outer protecting cylinder on construction can be avoided. The inner protection barrel can be smoothly pulled out, so that the inner protection barrel is convenient to recycle, and the cost is reduced;

drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a partial enlarged view of embodiment A of the present invention;

FIG. 3 is a partial enlarged view of embodiment B of the present invention;

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.