Buffer connecting device for pore-forming-free steel pipe micro pile construction

Abstract

The utility model relates to the technical field of miniature steel pipe pile construction equipment, and discloses a buffering connecting device for pore-forming-free steel pipe miniature pile construction, which comprises an upper connecting piece, a lower connecting piece and a lower connecting piece, the lower connecting piece is movably arranged at the lower end of the upper connecting piece in a sleeving mode through a buffering piece and matched with the steel pipe; the buffering piece is movably arranged at the lower end of the upper connecting piece in a sleeving mode and matched with the lower connecting piece; during use, the buffer piece is arranged between the upper connecting piece and the lower connecting piece in a sleeving mode, and the buffer protection effect can be effectively achieved; through the arrangement of an inclined plane, a limiting column positioning groove and a limiting column, a constructor can conveniently adjust the buffering threshold value of the buffering piece according to site requirements, and the buffering piece is suitable for the buffering effect under different impact force and soil hardness conditions; the problem that steel pipes are prone to deformation and damage when the geology is hard or the rear side hammering force is too large due to short-time violent impact force or the blocking effect of a soil layer below during piling in existing rigid connection is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro steel pipe pile construction equipment, and in particular relates to a buffer connection device for the construction of non-hole steel pipe micro piles. Background Art

[0002] With the continuous development of engineering construction in my country, foundation pit support has appeared in large numbers in engineering projects and has become a major problem that must be solved in engineering projects. The design and construction of micro steel pipe piles under specific conditions have received more and more attention. Due to the needs of industrial layout and urban planning, more and more large, tall, and heavy industrial plants, high-rise buildings, dock culverts, bridge silos and other structures are being built on soft foundations or in specific places. Therefore, the foundation pit support technology of such projects has been fully developed. As a "small-diameter high-strength" pile, micro steel pipe piles have gradually attracted the attention of designers for their unique advantages in some specific occasions. Therefore, various types of micro pile support with different specifications and sizes have been derived. Since a large number of construction processes for such piles are carried out according to the construction process of drilling first, placing steel pipes, and then grouting, they are limited by the construction process and are used for foundation pit support, and the construction efficiency is not high. The construction of steel pipe micro piles without drilling holes is a construction process that uses a hydraulic oil hammer to impact the steel pipe to the designed depth and then pours concrete to form the pile. This process changes the traditional construction process of drilling holes, lowering steel pipes, and then pouring concrete to form piles. When constructing micro piles with a diameter of more than 100mm, it can effectively improve construction efficiency and shorten construction period.

[0003] When constructing steel pipe micro-piles without drilling, the commonly used method is to install a hydraulic hammer at the front end of the excavator's arm, and then use the impact force generated by the hydraulic hammer to impact the steel pipe to the designed depth; and currently, when hammering steel pipes, the piston rod end of the hydraulic hammer is directly rigidly connected to the steel pipe. Therefore, when the hydraulic hammer generates the impact force of the hammer, the external impact force is fully applied to the steel pipe, which is easy to cause deformation and damage to the steel pipe when the geology is hard or the rear hammering force is too large due to a short-term fierce impact force or the blocking effect of the soil layer below, affecting the quality of the project. However, in the current construction equipment, there is no relevant connection structure that can play a buffering connection role when constructing steel pipe micro-piles without drilling.

[0004] Therefore, the utility model proposes a buffer connection device for the construction of hole-free steel pipe micro piles to solve the problems existing in the above-mentioned technology. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the utility model provides a buffer connection device for the construction of steel pipe micro-piles without drilling holes, which has the advantages of being able to effectively connect the steel pipe with the hydraulic oil hammer and effectively buffer the hammer impact force generated by the hydraulic oil hammer. It solves the problem of deformation and damage of the steel pipe when the geology is hard or the hammer force on the rear side is too large due to short-term high-frequency impact during piling.

[0007] (II) Technical solution

[0008] In order to achieve the purpose of quickly connecting the steel pipe with the hydraulic hammer, effectively buffering the hammering impact force generated by the hydraulic hammer, and protecting the steel pipe, the utility model provides the following technical solutions:

[0009] A buffer connection device for hole-free steel pipe micro-pile construction is arranged between a hydraulic oil hammer and a steel pipe, comprising: an upper connection piece, which is detachably arranged at the end of a piston rod of the hydraulic oil hammer; a lower connection piece, which is movably sleeved on the lower end of the upper connection piece through a buffer piece and is adapted to the steel pipe; and a buffer piece, which is movably sleeved on the lower end of the upper connection piece and is adapted to the lower connection piece.

[0010] As a preferred solution of the buffer connection device for the construction of non-hole steel pipe micro-pile described in the utility model: the upper connecting piece includes: a connecting part, which is detachably arranged on the end of the piston rod of the hydraulic oil hammer; a hammering force transmission part, which is arranged at the bottom of the connecting part and is adapted to the lower connecting piece; the hammering force transmission part includes an integrally formed: a screw column, which is a solid structure, and an external thread is arranged on the screw column to match the internal thread at the lower end of the connecting part, and the upper end face of the screw column also abuts against the lower end face of the piston positioning ring; a buffer limiting ring is arranged at the lower end of the screw column and is adapted to the limiting inner ring arranged in the lower connecting piece; the connecting part includes an integrally formed buffer positioning ring, which is arranged on the outer side of the upper end of the steel casing and is adapted to the buffer; the steel casing is a tubular structure adapted to the piston rod of the hydraulic oil hammer, and a plurality of connecting holes are also arranged on the steel casing; the piston positioning ring is arranged on the inner side of the lower end of the steel casing and is adapted to the piston rod end of the hydraulic oil hammer.

[0011] Based on the above technical features: when in use, a buffer is inserted into the lower end of the steel casing, the connection part is transmitted from the top to the lower connection part, the hammer force transmission part is transmitted from the bottom to the lower connection part, and the connection part is screwed to the hammer force transmission part; then before the steel pipe micro-pile construction, after completing the installation of the hydraulic oil hammer on the mechanical arm, adjust the position, extend the piston of the hydraulic oil hammer into the steel casing until it contacts the piston positioning ring, use the connecting bolt to pass through the connecting hole to fix the piston, and connect the connection part to the piston rod of the hydraulic oil hammer, so that the device can be quickly connected and assembled at the construction site; at the same time, by arranging the buffer between the upper connection part and the lower connection part, it can effectively play a buffering and protective role to prevent the hydraulic oil hammer from having too large an instantaneous hammering force, causing the steel pipe to be deformed and damaged when the geology is hard or the hammering force on the rear side is too large, affecting the quality of the project.

[0012] As a preferred solution of the buffer connection device for the construction of hole-free steel pipe micro-pile described in the utility model: the lower connecting piece is a sleeve structure movably mounted on the lower end of the steel casing, and the upper end face of the lower connecting piece includes an integrally formed supporting surface, the supporting surface is a horizontal surface, and is adapted to the buffer; an inclined surface, the inclined surfaces are continuously arranged, and a plurality of limit column positioning grooves are arranged on the inclined surface, and the limit column positioning grooves are adapted to the limit columns arranged on the outside of the steel casing; an arc-shaped groove is also arranged in the limit column positioning groove, and the arc-shaped groove is adapted to the limit column; an internal thread is also arranged in the lower connecting piece on the lower side of the limit inner ring; the buffer is a spring.

[0013] Based on the above technical features: through the setting of the inclined surface, the limit column positioning groove and the limit column, it is convenient for construction personnel to rotate the lower connecting piece according to the needs of the site to adjust the limit column to be stuck in the limit column positioning groove at different heights during use, so as to achieve different degrees of compression of the buffer part, and then adjust its buffering threshold so that it can be suitable for buffering under different impact forces and soil hardness conditions, thereby protecting the steel pipe and effectively expanding its applicable environment.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the utility model provides a buffer connection device for the construction of non-hole steel pipe micro piles, which has the following beneficial effects:

[0016] The utility model designs a buffer connection device for the construction of non-hole steel pipe micro piles, comprising an upper connection piece, a lower connection piece and a buffer piece. The upper connection piece can be detachably mounted on the piston rod end of a hydraulic oil hammer, and the lower connection piece is movably sleeved on the lower end of the upper connection piece through the buffer piece. The buffer piece is movably sleeved on the lower end of the upper connection piece and is used in conjunction with the lower connection piece. When in use:

[0017] 1. By arranging the buffer between the upper connector and the lower connector, it can effectively play a buffering and protective role to prevent the hydraulic oil hammer from having too much instantaneous hammering force, causing the steel pipe to deform and be damaged when the geology is hard or the hammering force on the rear side is too large, thus affecting the quality of the project.

[0018] 2. Through the setting of the inclined surface, the limit column positioning groove and the limit column, it is convenient for construction personnel to rotate the lower connecting piece according to the needs of the site to adjust the limit column to be stuck in the limit column positioning groove at different heights, so as to achieve different degrees of compression of the buffer part, and then adjust its buffering threshold so that it can be suitable for the buffering effect under different impact forces and soil hardness conditions, thereby protecting the steel pipe and effectively expanding its applicable environment; the steel pipe is quickly connected to the hydraulic oil hammer, and the hammering impact force generated by the hydraulic oil hammer is effectively buffered to protect the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the construction principle of steel pipe micro piles without drilling.

[0020] Figure 2 The utility model is a schematic structural diagram of a buffer connection device for the construction of a hole-free steel pipe micropile.

[0021] Figure 3 It is a schematic structural diagram of the buffer connection device for hole-free steel pipe micro pile construction without a protective sleeve of the utility model.

[0022] Figure 4 It is a structural schematic diagram of the upper connecting piece of the utility model.

[0023] Figure 5 It is a structural schematic diagram of the upper connecting piece of the utility model without the protective cover.

[0024] Figure 6 It is a cross-sectional view of the upper connecting piece of the utility model.

[0025] Figure 7 It is a partial enlarged view of the buffer connection device A for the construction of the hole-free steel pipe micro pile of the utility model.

[0026] Figure 8 It is a structural schematic diagram of the lower connecting piece of the utility model.

[0027] Fig. 9 It is a cross-sectional view of the lower connecting piece of the utility model.

[0028] In the figure: 1. hydraulic oil hammer, 2. steel pipe, 3. upper connecting piece, 31. connecting part, 311. buffer positioning ring, 312. steel casing, 313. connecting hole, 314. piston positioning ring, 32. hammer force transmission part, 321. screw column, 322. buffer limiting ring, 33. limiting column, 34. protective sleeve, 341. stiffening plate, 342. limiting plate, 4. lower connecting piece, 41. limiting column positioning groove, 411. arc groove, 42. supporting surface, 43. limiting inner ring, 44. inclined surface. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example 1: Please refer to Figure 1 , Figure 2 and Figure 3 The utility model provides a technical solution: a buffer connection device for the construction of non-hole steel pipe micro-pile, the buffer connection device is installed between the hydraulic oil hammer 1 and the steel pipe 2, and is used to connect the hydraulic oil hammer 1 to the steel pipe 2, including an upper connection piece 3, a lower connection piece 4 and a buffer piece 5; wherein the upper connection piece 3 is detachably installed on the piston rod end of the hydraulic oil hammer 1, and moves with the piston rod of the hydraulic oil hammer 1; the lower connection piece 4 is movably sleeved on the lower end of the upper connection piece 3 through the buffer piece 5, and is connected to the steel pipe 2, and is used to apply the hydraulic oil hammer impact force transmitted through the upper connection piece 3 to the steel pipe 2 to hammer it into the ground; the buffer piece 5 is movably sleeved on the lower end of the upper connection piece 3, and is used in conjunction with the lower connection piece 4 to play a buffering role, and is used to buffer the hammering impact force of the hydraulic oil hammer 1 on the steel pipe 2, and protect the steel pipe 2.

[0031] Example 2: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In order to facilitate the connection with the hydraulic oil hammer 1 and the lower connecting piece 4, the upper connecting piece 3 is designed to include a connecting portion 31 and a hammering force transmitting portion 32. The connecting portion 31 is detachably connected to the hydraulic oil hammer 1, and the hammering force transmitting portion 32 is arranged at the bottom of the connecting portion 31 and is used in conjunction with the lower connecting piece 4 to limit the lower connecting piece 4.

[0032] As a preferred solution, in order to facilitate the connection with the hydraulic oil hammer 1, the connection part 31 is designed to include an integrally formed buffer positioning ring 311, a steel sleeve 312 and a piston positioning ring 314; wherein the buffer positioning ring 311 is arranged on the outer side of the upper end of the steel sleeve 312, and is used in conjunction with the upper end of the buffer 5 to limit the upper end of the buffer 5; the steel sleeve 312 is a tubular structure used in conjunction with the piston rod of the hydraulic oil hammer 1, and the piston rod of the hydraulic oil hammer 1 is inserted into the steel sleeve 312 and connected to the steel sleeve 312, and is used when in use To fix the piston rod, a connecting hole 313 is also provided on the steel sleeve 312, which is used in conjunction with the connecting bolt to connect the connecting part 31 to the piston rod of the hydraulic oil hammer 1 when in use; the piston positioning ring 314 is provided on the inner side of the lower end of the steel sleeve 312, and is used in conjunction with the end of the piston rod of the hydraulic oil hammer 1 to limit it and also have the function of transmitting force and impact force. When the end of the piston rod contacts the upper surface of the piston positioning ring 314, the connecting part 31 is connected to the hydraulic oil hammer 1 by using the connecting bolt, so as to facilitate assembly during use and disassembly after use.

[0033] As a preferred solution, the hammer force transmission part 32 includes an integrally formed solid screw column 321 and a buffer component limiting ring 322, wherein the screw column 321 is provided with an external thread for use with the internal thread at the lower end of the connecting part 31, and the hammer force transmission part 32 is connected to the connecting part 31 through the screw connection of the two, and the upper end surface of the screw column 321 is also abutted against the lower end surface of the piston positioning ring 314, thereby reducing the energy loss during hammering after installation; the buffer component limiting ring 322 is arranged at the lower end of the screw column 321, and is used in conjunction with the limiting inner ring 43 arranged in the lower connecting part 4 to realize the movable connection between the upper connecting part 3 and the lower connecting part 4.

[0034] As a preferred solution, in order to protect the buffer 5, a protective sleeve 34 is further provided on the lower side of the buffer positioning ring 311, and a limiting plate 342 is provided at the lower end of the protective sleeve 34; and in order to enhance the strength of the protective sleeve 34, a stiffening plate 341 is further provided on the outer side of the protective sleeve 34.

[0035] Example 3: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 and Fig. 9In order to facilitate the adjustment of the buffering force of the buffer 5 as needed, the lower connecting member 4 is designed as a sleeve structure that is movably sleeved on the lower end of the steel casing 312, and the upper end surface of the lower connecting member 4 includes an integrally formed support surface 42 and a continuous inclined surface 44; wherein the support surface 42 is a horizontal surface, and is used in conjunction with the lower end of the buffer 5 to limit the lower end surface of the buffer 5; a plurality of limit column positioning grooves 41 are provided on the inclined surface 44 to be used in conjunction with the limit column 33 provided on the outside of the steel casing 312. When in use, the limit column 33 is adjusted by rotating the lower connecting member 4 so that it is stuck in the limit column positioning groove 41 at different height positions to achieve different degrees of compression of the buffer 5, and then adjust its buffering threshold so that it can be suitable for the buffering effect under different impact forces and soil hardness conditions to protect the steel pipe 2.

[0036] As a preferred solution, in order to be suitable for steel pipes 2 of different diameters when in use, an internal thread is also provided in the lower connecting piece 4 on the lower side of the limiting inner ring 43, which is used to install sleeves of different diameters when in use, so that its inner diameter can meet the connection requirements of steel pipes 2 of different diameters.

[0037] As a preferred solution, in order to facilitate adjustment and installation during use, the buffer member 5 is preferably designed to use a spring.

[0038] As a preferred solution, in order to cooperate with the limiting column 33 to limit the limiting column 33, an arc-shaped groove 411 is further provided in the limiting column positioning groove 41 to cooperate with the limiting column 33 to prevent the limiting column 33 from sliding out during use.

[0039] The construction process of the buffer connection device for the construction of the non-hole-forming steel pipe micropile described in Examples 1 to 3 includes:

[0040] Step 1: Installation

[0041] (1) First, assemble the buffer connection device, that is, insert the buffer member 5 into the lower end of the steel sleeve 312, transmit the connection part 31 from the top to the lower connection part 4, transmit the hammer force transmission part 32 from the bottom to the lower connection part 4, and screw the connection part 31 and the hammer force transmission part 32 together; complete the assembly of the device;

[0042] (2) Before the steel pipe micropile construction is carried out, after the hydraulic oil hammer 1 is installed on the mechanical arm, the position is adjusted, and the piston of the hydraulic oil hammer 1 is inserted into the steel casing 312 until it contacts the piston positioning ring 314, and the piston is fixed by passing the connecting bolt through the connecting hole 313, and the connecting part 31 is connected to the piston rod of the hydraulic oil hammer 1;

[0043] (3) According to the soil hardness of the bottom layer of the construction, the limit column 33 is adjusted by rotating the lower connecting member 4 so as to be stuck in the limit column positioning groove 41 at different heights, so as to achieve different degrees of compression of the buffer 5, and then adjust its buffering threshold so that it can be suitable for the buffering effect under different impact forces and soil hardness conditions, thereby protecting the steel pipe 2;

[0044] (4) Construction of steel pipe micro piles without drilling holes under external impact.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A buffer connection device for the construction of a non-drilling steel pipe micropile, arranged between a hydraulic hammer (1) and a steel pipe (2), characterized in that: include An upper connecting piece (3) is detachably arranged on the end of the piston rod of the hydraulic hammer (1); The lower connecting piece (4) is movably sleeved on the lower end of the upper connecting piece (3) through the buffer piece (5) and is adapted to the steel pipe (2); The buffer member (5) is movably sleeved on the lower end of the upper connecting member (3) and is matched with the lower connecting member (4).

2. A buffer connection device for construction of non-drilling steel pipe micro piles as claimed in claim 1, characterized in that: The upper connecting member (3) comprises A connecting portion (31) is detachably arranged on the end of a piston rod of the hydraulic oil hammer (1); The hammer force transmission part (32) is arranged at the bottom of the connection part (31) and is matched with the lower connection piece (4).

3. A buffer connection device for construction of non-drilling steel pipe micro piles as claimed in claim 2, characterized in that: The hammer force transmission part (32) comprises an integrally formed The screw connection column (321) is a solid structure, and is provided with an external thread that matches the internal thread at the lower end of the connecting portion (31). The upper end surface of the screw connection column (321) also abuts against the lower end surface of the piston positioning ring (314); The buffer member limiting ring (322) is arranged at the lower end of the screw connection column (321) and is matched with the limiting inner ring (43) arranged in the lower connecting member (4).

4. A buffer connection device for construction of non-drilling steel pipe micro piles as claimed in claim 2, characterized in that: The connecting portion (31) comprises an integrally formed A buffer member positioning ring (311) is arranged outside the upper end of the steel sleeve (312) and is adapted to the buffer member (5); The steel sleeve (312) is a tubular structure adapted to the piston rod of the hydraulic hammer (1), and a plurality of connecting holes (313) are also provided on the steel sleeve (312); The piston positioning ring (314) is arranged on the inner side of the lower end of the steel sleeve (312) and is matched with the piston rod end of the hydraulic oil hammer (1).

5. A buffer connection device for construction of non-drilling steel pipe micro piles as claimed in claim 3, characterized in that: The lower connecting piece (4) is a sleeve structure that is movably sleeved on the lower end of the steel sleeve (312), and the upper end surface of the lower connecting piece (4) includes an integrally formed A supporting surface (42), the supporting surface (42) being a horizontal surface and being adapted to the buffer member (5); The inclined surface (44) is continuously arranged, and a plurality of limit column positioning grooves (41) are arranged on the inclined surface (44), wherein the limit column positioning grooves (41) are matched with the limit columns (33) arranged outside the steel sleeve (312).

6. A buffer connection device for construction of non-drilling steel pipe micro piles as claimed in claim 5, characterized in that: An arc-shaped groove (411) is also provided in the limiting column positioning groove (41), and the arc-shaped groove (411) is adapted to the limiting column (33).

7. A buffer connection device for hole-free steel pipe micropile construction as claimed in claim 5, characterized in that: The lower connecting piece (4) at the lower side of the limiting inner ring (43) is also provided with an internal thread.

8. A buffer connection device for construction of non-drilling steel pipe micro piles as claimed in any one of claims 1 to 7, characterized in that: The buffer member (5) is a spring.

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