阅读说明：本技术 一种球墨铸铁螺旋桩 (Nodular cast iron screw pile ) 是由 于逸飞 于 2020-06-09 设计创作，主要内容包括：本发明涉及螺旋桩领域,具体是一种球墨铸铁螺旋桩,包括导向管、旋翼和旋翼套管,所述导向管为球墨铸铁材质,所述旋翼呈螺旋状,所述旋翼与旋翼套管固定连接,所述旋翼套管与导向管套接并通过螺纹连接件固定连接。相对于现有技术,本发明球墨铸铁螺旋桩的有益效果为：旋翼通过螺纹连接件固定安装在导向管上,从而实现旋翼与导向管的分开装运以及快速现场装配,能够充分利用运输工具的空间,降低运输费用,提高运输效率,并且,能够充分利用球墨铸铁较高的耐腐蚀能力,避免球墨铸铁因焊接导致的开裂问题。(The invention relates to the field of screw piles, in particular to a nodular cast iron screw pile which comprises a guide pipe, a rotor wing and a rotor wing sleeve, wherein the guide pipe is made of nodular cast iron, the rotor wing is spiral, the rotor wing is fixedly connected with the rotor wing sleeve, and the rotor wing sleeve is sleeved with the guide pipe and is fixedly connected with the guide pipe through a threaded connecting piece. Compared with the prior art, the nodular cast iron screw pile has the beneficial effects that: the rotor passes through threaded connection spare fixed mounting on the stand pipe to realize rotor and the separately shipment and the quick on-the-spot assembly of stand pipe, the space that can make full use of transport means reduces the freight cost, improves the conveying efficiency, and, can the higher corrosion resisting ability of make full use of nodular cast iron, avoid nodular cast iron because of the fracture problem that the welding leads to.)

1. The utility model provides a nodular cast iron screw pile, includes stand pipe (1) and rotor (2), stand pipe (1) is the nodular cast iron material, rotor (2) are heliciform, its characterized in that: still include rotor sleeve pipe (3), rotor (2) and rotor sleeve pipe (3) fixed connection, rotor sleeve pipe (3) cup joint and pass through threaded connection spare fixed connection with stand pipe (1).

2. The helical pile of ductile iron according to claim 1, wherein: rotor sleeve pipe (3) and stand pipe (1) are last to be equipped with a plurality of connecting holes (4) with threaded connection spare assorted respectively, the axis level of connecting hole (4) just intersects with the axis of stand pipe (1), and the axis of two arbitrary connecting holes (4) is not coplane.

3. The helical pile of ductile iron according to claim 2, wherein: rotor sleeve pipe (3) and stand pipe (1) are through bolt-nut subassembly fixed connection, bolt-nut subassembly includes bolt (5) and nut (6), connecting hole (4) are the through-hole, bolt (5) pass establish the through-hole on rotor sleeve pipe (3) and stand pipe (1) and lock through nut (6).

4. The helical pile of ductile iron according to claim 2, wherein: rotor sleeve pipe (3) pass through screw (7) fixed connection with stand pipe (1), connecting hole (4) are the screw hole, screw (7) with establish the screw hole screw-thread fit on rotor sleeve pipe (3) and stand pipe (1).

5. The helical pile of ductile iron according to claim 1, wherein: the connecting sleeve is respectively sleeved with the guide pipes (1) at the two ends of the connecting sleeve and the extension pipes (8) or the two extension pipes (8) and is fixedly connected with the connecting sleeve through a threaded connecting piece.

6. The helical pile of ductile iron according to claim 5, wherein: the connecting sleeve comprises a straight sleeve (9) and a reducing sleeve (10); the large-diameter end of the reducing sleeve (10) is sleeved outside the guide pipe (1) or the extension pipe (8) at the lower end of the reducing sleeve and is fixedly connected with the guide pipe or the extension pipe (8) through a screw (7), and the screw (7) is in threaded fit with threaded holes formed in the reducing sleeve (10) and the guide pipe (1) or the extension pipe (8); the upper end of the straight sleeve (9) is sleeved outside the extension pipe (8) at the upper end of the straight sleeve and is fixedly connected with the extension pipe through a screw (7), and the screw (7) is in threaded fit with threaded holes formed in the straight sleeve (9) and the extension pipe (8); the small-diameter end of the reducing sleeve (10) is sleeved inside the straight sleeve (9) and fixedly connected with the straight sleeve through a bolt-nut assembly, the bolt-nut assembly comprises a bolt (5) and a nut (6), and the bolt (5) penetrates through holes formed in the reducing sleeve (10) and the straight sleeve (9) and is locked through the nut (6).

7. The helical pile of ductile iron according to claim 5, wherein: the length of the guide tube (1) is 4-6m, the outer diameter of the guide tube (1) is 150-300mm, and the wall thickness of the guide tube (1) is 8-14 mm; the length of the extension pipe (8) is 4-6m, the outer diameter of the extension pipe (8) is 150-300mm, and the wall thickness of the extension pipe (8) is 8-14 mm.

8. The helical pile of ductile iron according to any one of claims 1-7, wherein: rotor (2) and rotor sleeve pipe (3) all adopt the nodular cast iron material, rotor (2) and rotor sleeve pipe (3) integrated into one piece.

9. The helical pile of ductile iron according to any one of claims 1-7, wherein: rotor (2) and rotor sleeve pipe (3) all adopt the steel, rotor (2) and rotor sleeve pipe (3) welded fastening.

10. The helical pile of ductile iron according to any one of claims 1-7, wherein: the diameter of the rotor (2) is 300-800mm, and the thickness of the rotor is 12-20 mm.

Technical Field

The invention relates to the field of screw piles, in particular to a nodular cast iron screw pile.

Background

At present, the foundation piles commonly used in the engineering field are various in types, and cement cast piles, steel spiral piles, steel hammered piles, nodular cast iron hammered piles and the like are common.

The construction process of cement cast piles is complex, the lower steel pipe is punched, and cement is injected for sealing, so that the construction period is long, and the cement cast pile is not environment-friendly.

The steel spiral pile and the steel hammering pile are made of steel materials, and have the advantages of high material strength and easy welding; the defects are that the corrosion resistance is poor, the application range is influenced, if the surface of the product is galvanized for corrosion prevention, the environment is damaged, and the production cost is increased.

The nodular cast iron hammered pile is a newly emerging foundation pile in recent years, and two adjacent pile pipes are connected in a socket joint mode, so that the bearing pull-up force is small; the hammering pile does not have the rotor, bears the weight of the atress less down. In order to improve the bearing capacity of the hammered pile, cement is poured into the pile pipe in the construction process, the wall surrounded by the cement on the outer side increases the friction force with soil, or a hammering base is installed at the front end of the pile pipe, and the hammering is carried out until the stressed rock layer.

CN106987761A discloses a nodular cast iron screw pile, refer to the specification of this document, paragraph 0075, paragraph 0076, the nodular cast iron screw pile includes the stand pipe, the stand pipe is straight stand pipe 1, the lower extreme of straight stand pipe 1 has slope type pinnacle 1.1, the contained angle of the place plane and the horizontal plane of slope type pinnacle 1.1 is 45, the upper end of straight stand pipe 1 has socket 1.2, socket 1.2 department of straight stand pipe 1 is equipped with 4 bolt holes, is equipped with two rotor wings 2 that are spiral rising form along the axis of straight stand pipe 1 in proper order, the number of turns of rotor wings 2 equals 1, the difference in height of 2.2 at the beginning of rotor wing 2 and terminal 2.1 is 150 mm. The straight guide tube 1 is connected with the rotor 2 through welding. The nodular cast iron screw pile has the following defects: because the rotor shape is irregular, lead to this nodular cast iron screw pile loading occupation space great, the transportation difficulty.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a nodular cast iron screw pile, wherein a rotor wing is fixedly arranged on a guide pipe through a threaded connecting piece, so that the rotor wing and the guide pipe are separately shipped and rapidly assembled on site, the space of a transport tool is fully utilized, the transport cost is reduced, the transport efficiency is improved, the higher corrosion resistance of nodular cast iron is fully utilized, and the cracking problem of the nodular cast iron caused by welding is avoided.

The technical problem to be solved by the invention is realized by adopting the following technical scheme: the utility model provides a nodular cast iron screw pile, includes stand pipe, rotor and rotor sleeve pipe, the stand pipe is the nodular cast iron material, the rotor is the heliciform, rotor and rotor sleeve pipe fixed connection, the rotor sleeve pipe cup joints and passes through threaded connection spare fixed connection with the stand pipe.

The technical scheme of the invention is as follows: the rotor sleeve pipe is equipped with a plurality of connecting holes that match with threaded connection spare on with the stand pipe respectively, the axis level of connecting hole just intersects with the axis of stand pipe, and the axis of two arbitrary connecting holes is not coplane. By adopting the technical scheme, when the spiral pile bears the acting forces of pressing down, pulling up and the like, the connecting holes with a plurality of non-coplanar axes are adopted, the acting forces of the threaded connecting piece on the guide pipe and the rotor casing can be dispersed, and the guide pipe or the rotor casing is prevented from cracking.

The technical scheme of the invention is as follows: the rotor sleeve is fixedly connected with the guide pipe through a bolt-nut assembly, the bolt-nut assembly comprises a bolt and a nut, the connecting hole is a through hole, and the bolt penetrates through the through hole formed in the rotor sleeve and the guide pipe and is locked through the nut. Compared with the connection of a screw and a threaded hole, the clearance between the bolt and the through hole is larger, so that the rotor sleeve and the guide pipe are more easily connected by adopting the bolt-nut assembly connection.

The technical scheme of the invention is as follows: the rotor sleeve pipe passes through screw fixed connection with the stand pipe, the connecting hole is the screw hole, the screw with establish the screw hole screw-thread fit on rotor sleeve pipe and stand pipe. Compared with the connection of a screw and a threaded hole, the clearance between the bolt and the through hole is larger, so that the damage of the guide pipe or the rotor casing pipe caused by the overlarge stress at the connection part of the individual bolt can be effectively prevented by adopting the screw connection.

The technical scheme of the invention is as follows: the connecting sleeve is respectively sleeved with the guide pipes at the two ends of the connecting sleeve and the extension pipes or the two extension pipes and is fixedly connected with the extension pipes or the two extension pipes through threaded connecting pieces. The extension pipe is used for lengthening the total length of the spiral pile, and the number of the extension pipe is one or more sections according to soil conditions and foundation bearing capacity.

The technical scheme of the invention is as follows: the connecting sleeve comprises a straight sleeve and a reducing sleeve; the large-diameter end of the reducing sleeve is sleeved outside the guide pipe or the extension pipe at the lower end of the reducing sleeve and is fixedly connected with the guide pipe or the extension pipe through a screw, and the screw is in threaded fit with threaded holes formed in the reducing sleeve and the guide pipe or the extension pipe; the upper end of the straight sleeve is sleeved outside the extension pipe at the upper end of the straight sleeve and is fixedly connected with the extension pipe through a screw, and the screw is in threaded fit with threaded holes formed in the straight sleeve and the extension pipe; the small-diameter end of the reducing sleeve is sleeved inside the straight sleeve and fixedly connected through a bolt-nut assembly, the bolt-nut assembly comprises a bolt and a nut, and the bolt penetrates through holes formed in the reducing sleeve and the straight sleeve and is locked through the nut. Compared with the connection of a screw and a threaded hole, the gap between the bolt and the through hole is large, and in site construction, holes corresponding to the threaded connecting piece are difficult to align for two large-scale pipe fittings needing to be connected, so that the two large-scale pipe fittings are easily connected through the bolt-nut assembly, but the problem of overlarge stress at the connection part of individual bolts exists, and further the pipe fittings are damaged. By adopting the technical scheme, the reducing sleeve with smaller volume is connected with the guide pipe or the extension pipe through the screw, the straight sleeve with smaller volume is connected with the extension pipe through the screw so as to reduce the overlarge local stress of the guide pipe or the extension pipe, then the extension pipe is hoisted, the straight sleeve is connected with the reducing sleeve through the bolt-nut assembly, and the wall thickness of the straight sleeve and the wall thickness of the reducing sleeve can be larger due to the fact that the straight sleeve and the reducing sleeve are smaller in volume so as to resist the overlarge local stress caused by the bolt.

The technical scheme of the invention is as follows: the length of the guide tube is 4-6m, the outer diameter of the guide tube is 150-300mm, and the wall thickness of the guide tube is 8-14 mm; the length of the extension pipe is 4-6m, the outer diameter of the extension pipe is 150-300mm, and the wall thickness of the extension pipe is 8-14 mm.

The technical scheme of the invention is as follows: rotor and rotor sleeve pipe all adopt the nodular cast iron material, rotor and rotor sleeve pipe integrated casting shaping. The welding performance of nodular cast iron is relatively poor, so that the rotor and the rotor sleeve are integrally cast and formed, and the cracking problem caused by welding can be effectively avoided.

The technical scheme of the invention is as follows: rotor and rotor sleeve pipe all adopt the steel, rotor and rotor sleeve pipe welded fastening. Steel has the advantages of high strength and easy welding, can be galvanized on the surface thereof although the corrosion resistance is poor, and has less damage to the environment because the number of rotors is small and the volume is small.

The technical scheme of the invention is as follows: the diameter of the rotor wing is 300-800mm, and the thickness of the rotor wing is 12-20 mm.

The technical scheme of the invention is as follows: the rotor is equipped with a plurality ofly, distance between the upper and lower end of rotor is a pitch, and is a plurality of distance between the rotor is the integer multiple of rotor pitch.

Compared with the prior art, the nodular cast iron screw pile has the beneficial effects that: the rotor passes through threaded connection spare fixed mounting on the stand pipe to realize rotor and the separately shipment and the quick on-the-spot assembly of stand pipe, the space that can make full use of transport means reduces the freight cost, improves the conveying efficiency, and, can the higher corrosion resisting ability of make full use of nodular cast iron, avoid nodular cast iron because of the fracture problem that the welding leads to.

Drawings

Fig. 1 is a front view of a nodular cast iron screw pile according to an embodiment.

Fig. 2 is a sectional view taken along the line a-a in fig. 1.

Fig. 3 is a perspective view of a rotor according to a first embodiment.

Fig. 4 is a front view of a rotor according to a first embodiment.

Fig. 5 is a top view of a rotor according to a first embodiment.

Fig. 6 is a front view and a partial sectional view of a nodular cast iron screw pile according to an embodiment.

In the figure: 1. the rotor wing comprises a guide pipe, 2, a rotor wing, 3, a rotor wing sleeve pipe, 4, a connecting hole, 5, a bolt, 6, a nut, 7, a screw, 8, an extension pipe, 9, a straight sleeve pipe, 10 and a reducing sleeve pipe.

Detailed Description

The following examples are further illustrative of the present invention, but the present invention is not limited thereto. The present invention is relatively complicated, and therefore, the detailed description of the embodiments is only for the point of the present invention, and the prior art can be adopted for the present invention.