CN108277968B - Bamboo joint type scaffold steel pipe and manufacturing method thereof - Google Patents
Bamboo joint type scaffold steel pipe and manufacturing method thereof Download PDFInfo
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- CN108277968B CN108277968B CN201711458877.5A CN201711458877A CN108277968B CN 108277968 B CN108277968 B CN 108277968B CN 201711458877 A CN201711458877 A CN 201711458877A CN 108277968 B CN108277968 B CN 108277968B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/02—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means
- E04G1/04—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means the members being exclusively poles, rods, beams, or other members of similar form and simple cross-section
- E04G1/06—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means the members being exclusively poles, rods, beams, or other members of similar form and simple cross-section comprising members with rod-like or tubular portions fitting together end to end, with or without separate connecting pieces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
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- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention discloses a bamboo joint type scaffold steel pipe, which comprises: the steel pipe body is used for lapping the thin-wall steel pipe of the scaffold; a plurality of pressure grooves are annularly arranged on the outer wall of the steel pipe body at intervals, and a plurality of annular bulges are inwards convexly arranged on the inner wall of the steel pipe body corresponding to the pressure grooves; the inner supporting sheet is an inner supporting sheet for increasing the torsion of the steel pipe body; the supporting sheet in the tube and the annular bulges on the inner wall of the steel tube body are arranged in a one-to-one correspondence mode, and the annular bulges and the supporting sheet in the tube are meshed together. Also discloses a manufacturing method of the bamboo joint type scaffold steel pipe. This bamboo joint type scaffold steel pipe sets up the interior backing sheet of multi-disc at the inside equidistant of steel pipe body for the steel pipe is bamboo joint type structure, has guaranteed the use strength and the torsional strength of steel pipe, can not bending deformation, and the indent on the steel pipe outer wall can prevent the phenomenon of skidding in addition, and is safe in utilization, has reduced workman's intensity of labour, the cost is reduced, and the preparation is convenient.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a bamboo joint type scaffold steel pipe and a manufacturing method thereof.
Background
The steel pipe is the pipe fitting that is used for setting up the scaffold frame of common use in the building, but current scaffold frame has the steel pipe in order to guarantee its use intensity and twisting resistance, and the thickness ratio of the steel pipe of choosing for use is thicker, and the thick wall steel pipe is big at setting up scaffold frame in-process intensity of labour, has the easy emergence in the use moreover and skids, is difficult to fix, has the potential safety hazard.
Chinese patent literature (publication date: 11/5/2014, publication number: CN 104131692 a) discloses a novel steel pipe for scaffold, comprising: scaffold steel pipe body, scaffold steel pipe body's cross-section is circular, scaffold steel pipe body's outer wall processing has many recess lines, forms a relief line between per two adjacent recess lines, the contained angle of recess line on the circumferencial direction is 5~7 degrees, the contained angle of relief line on the circumferencial direction is 10~12 degrees, scaffold steel pipe body's wall thickness more than or equal to 3.5mm, the degree of depth more than or equal to 0.3mm, less than or equal to 0.4mm of recess line. Through the mode, the wood floor has the advantages of high strength, large bearing capacity and rough surface, and is not easy to slide after being laid.
According to the technical scheme, the groove lines and the convex lines are processed on the outer wall of the scaffold to achieve the anti-slip purpose, but the steel pipe has the anti-slip effect, but is thick in wall, heavy in weight and high in labor intensity.
Chinese patent document (publication date: 11/12/2014, publication number: CN 104141380A) discloses a high-strength steel pipe for a scaffold, comprising: scaffold steel pipe body is in with the setting a plurality of steel pipe strengthening ribs on the scaffold steel pipe body inner wall, be provided with anti-skidding line on the surface of scaffold steel pipe body, anti-skidding line is netted, be provided with anti rust coating on anti-skidding line's the surface. Through the mode, the wood board laying device is simple and reasonable in structure and high in bending strength, and after the wood board is laid, the wood board is not easy to slide.
Above-mentioned technical scheme is through setting up the strengthening rib on the steel pipe inner wall and set up anti-skidding line on the outer wall, improves bending strength and antiskid, and such technical scheme is though can strengthen bending strength and anti-skidding effect, but has increased the preparation degree of difficulty of steel pipe and has increased manufacturing cost.
Disclosure of Invention
The invention aims to solve the problems that the existing scaffold steel pipe has poor torsion resistance, is easy to bend and deform, is easy to slip in the use process, has thick wall, high labor intensity, high manufacturing difficulty, high cost and the like, and provides the bamboo joint type scaffold steel pipe which is convenient to process, low in cost, thin in wall, high in torsion resistance, difficult to bend and deform in the use process, free from slipping and low in labor intensity and the manufacturing method thereof.
The technical scheme adopted by the invention for realizing the first technical purpose is as follows: a bamboo joint type scaffold steel pipe includes:
the steel pipe body is used for lapping the thin-wall steel pipe of the scaffold; a plurality of pressure grooves are annularly arranged on the outer wall of the steel pipe body at intervals, and a plurality of annular bulges are inwards convexly arranged on the inner wall of the steel pipe body corresponding to the pressure grooves;
the inner supporting sheet is an inner supporting sheet for increasing the torsion of the steel pipe body; the supporting sheet in the tube and the annular bulges on the inner wall of the steel tube body are arranged in a one-to-one correspondence mode, and the annular bulges and the supporting sheet in the tube are meshed together.
The bamboo joint type scaffold steel pipe imitates the principle of torsion resistance of bamboo, a plurality of pieces of in-pipe support sheets are arranged in the steel pipe body at equal intervals, a plurality of press grooves are annularly arranged on the outer circumference of the steel pipe body, a plurality of annular bulges are formed on the inner wall of the steel pipe corresponding to the press grooves, the annular bulges and the in-pipe support sheets are mutually connected into a whole through an occlusion structure to form a bamboo joint type steel pipe structure, the structure can ensure the use strength and the torsion resistance strength of the steel pipe when the wall thickness of the steel pipe is reduced to the minimum value of a specified standard, the steel pipe cannot be bent and deformed under the action of the in-pipe support sheets in the steel pipe during use, and the phenomenon that the steel pipe slips in the use process is effectively prevented due to the arrangement of the press grooves on the outer wall of the steel pipe during use, the use safety performance is ensured, meanwhile, the, the weight of the whole steel pipe is greatly reduced, the labor intensity of workers is greatly reduced, the cost is also reduced, and the bamboo joint type scaffold steel pipe does not change the manufacturing process of the steel pipe and is convenient to manufacture.
Preferably, the supporting sheet in the pipe is of a ring sheet structure, an arc-shaped ring groove is annularly arranged on the circumference of the supporting sheet in the pipe, and the annular bulge on the inner wall of the steel pipe body is embedded into the arc-shaped ring groove and mutually meshed with the arc-shaped ring groove. The arc-shaped ring groove is annularly arranged on the circumference of the supporting sheet in the pipe, so that the forming of the pressing groove on the outer wall of the steel pipe and the annular bulge on the inner wall is facilitated, and meanwhile, the requirement for the arrangement that the supporting sheet in the pipe and the steel pipe body form an integrated structure is met.
Preferably, the center of the supporting sheet in the tube is provided with a central perforation. The central through hole is formed in the inner support piece of the pipe, so that the whole bamboo joint type scaffold steel pipe can be conveniently arranged.
Preferably, the thickness of the support sheet in the pipe is equal to the wall thickness of the steel pipe body. The thickness of the support sheet in the preferable pipe is equal to the wall thickness of the steel pipe body, so that the consistency of the torsional strength of the whole bamboo joint type scaffold steel pipe can be realized.
Preferably, the support sheet in the pipe and the steel pipe body are pressed together by a pressing wheel. The pressing wheel is used for pressing the support sheet in the pipe and the steel pipe body into a whole, so that the operation is convenient, and the connection is firmer.
The second technical purpose of the invention is realized by adopting the technical scheme that: a manufacturing method of bamboo joint type scaffold steel pipes comprises the following steps:
step 1) selecting a thin-wall steel pipe; and marking lines on the outer wall of the steel pipe at equal intervals;
step 2) manufacturing an in-pipe supporting sheet, namely manufacturing a plurality of circular in-pipe supporting sheets with the same thickness as the wall thickness of the thin-wall steel pipe at one time, punching a hole at the center of the circle of the in-pipe supporting sheet, and processing an arc-shaped annular groove on the circumference of the in-pipe supporting sheet to form the in-pipe supporting sheet;
step 3) the support sheets in the pipe are arranged on a central shaft in a penetrating way according to the same distance as the creasing line on the outer wall of the steel pipe, and then the central shaft with the support sheets in the pipe is penetrated into the steel pipe and positioned;
and 4) putting the steel pipe with the central shaft on a steel pipe marking press, pressing grooves inwards corresponding to the marking lines by pressing wheels on the marking press, forming the pressing grooves on the outer wall of the steel pipe, and simultaneously forming annular bulges on the inner wall of the steel pipe by inwards protruding the inner wall of the steel pipe, wherein the annular bulges are just embedded into the arc-shaped annular grooves of the support sheets in the steel pipe to be mutually occluded with the support sheets in the steel pipe, so that the support sheets in the steel pipe and the steel pipe body are integrated into a whole, and the manufacture of the bamboo joint type scaffold.
The manufacturing method of the bamboo joint type scaffold steel pipe is simple to operate and convenient to manufacture, and the manufacturing of the bamboo joint type scaffold can be realized only by purchasing the existing thin-walled pipe on the premise of not changing the manufacturing process of the steel pipe, so that the cost is low.
Preferably, after the bamboo joint type steel pipe scaffold is manufactured in the step 4), in order to further increase the connection strength between the support sheet in the pipe and the steel pipe, welding is performed at the occlusion position of the support sheet in the pipe and the annular bulge of the steel pipe.
Preferably, the interval of the scribing lines on the outer wall of the steel pipe in the step 1) is scribed according to the length of the bamboo joint, and the interval is generally 250 mm-300 mm.
Preferably, the groove depth of the arc-shaped ring groove on the supporting sheet in the pipe in the step 2) is more than or equal to 1.5mm and less than or equal to 2 mm.
Preferably, the pressing wheel in the step 4) is provided with a notching bump, and the shape of the notching bump is matched with that of the notching. Such a structure allows the indent and the annular protrusion to be formed in one piece.
The invention has the beneficial effects that: this bamboo joint type scaffold steel pipe, imitate the principle of bamboo's twisting resistance, set up the interior backing sheet of multi-disc pipe at the inside equidistant of steel pipe body, when making the wall thickness of steel pipe reduce the minimum of regulation standard, guaranteed the use strength and the twisting resistance intensity of steel pipe, the steel pipe is in the use because the conduct of inside intraductal backing sheet, can not bending deformation, and indent on the steel pipe outer wall can prevent the phenomenon of skidding, the security performance of using has been guaranteed, very big reduction workman's intensity of labour, the cost is also reduced, and bamboo joint type scaffold steel pipe can not change the manufacture craft of steel pipe, and the preparation is convenient.
Drawings
FIG. 1 is a schematic structural diagram of a bamboo joint type scaffold steel pipe of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a schematic view of a support sheet in the tube of the present invention;
FIG. 4 is a half-sectional view of the support piece in the tube of the present invention;
FIG. 5 is a schematic structural diagram of a manufacturing process of the bamboo joint type scaffold steel pipe;
in the figure: 1. the steel pipe comprises a steel pipe body, 2 parts of a pressure groove, 3 parts of an annular bulge, 4 parts of an inner support sheet, 5 parts of an arc-shaped annular groove, 6 parts of a central through hole, 7 parts of a central shaft, 8 parts of a pressure wheel, 9 parts of a pressure groove lug.
Detailed Description
The technical solution of the present invention is further described in detail by the following specific embodiments with reference to the accompanying drawings.
Example 1:
in the embodiment shown in fig. 1 and 2, the bamboo joint type scaffold steel pipe comprises:
the steel pipe body 1 is used for lapping the thin-wall steel pipe of the scaffold; a plurality of pressure grooves 2 are annularly arranged on the outer wall of the steel pipe body 1 at intervals, and a plurality of annular bulges 3 are inwards convexly arranged on the inner wall of the steel pipe body 1 corresponding to the pressure grooves 2;
the inner supporting sheet 4 is an inner supporting member for increasing the torsion of the steel pipe body; the support sheet 4 in the tube is arranged corresponding to the annular bulges 3 on the inner wall of the steel tube body 1 one by one, and the annular bulges 3 are meshed with the support sheet 4 in the tube.
The supporting sheet 4 in the pipe is of a ring sheet structure (see fig. 4), an arc-shaped ring groove 5 (see fig. 3) is annularly arranged on the circumference of the supporting sheet 4 in the pipe, and the annular bulge 3 on the inner wall of the steel pipe body 1 is embedded into the arc-shaped ring groove 5 and mutually meshed with the arc-shaped ring groove 5.
The center of the support sheet 4 inside the tube is provided with a central perforation 6. The thickness of the support sheet 4 in the tube is equal to the wall thickness of the steel tube body 1. The inner support sheet 4 and the steel tube body 1 are pressed into a whole through the pressing wheel.
As shown in fig. 5, a method for manufacturing a bamboo joint type scaffold steel pipe comprises the following steps:
step 1) selecting a thin-wall steel pipe; and marking lines on the outer wall of the steel pipe at equal intervals;
step 2) manufacturing an in-pipe supporting sheet, manufacturing a plurality of circular in-pipe supporting sheets with the same thickness as the wall thickness of the thin-wall steel pipe at one time, punching a hole 6 at the center of the circle of the in-pipe supporting sheet, and processing an arc-shaped annular groove 5 on the circumference of the in-pipe supporting sheet to form an in-pipe supporting sheet 4;
step 3) the support sheet 4 in the pipe is arranged on a central shaft 7 in a penetrating way according to the same distance as the crease line on the outer wall of the steel pipe, and then the central shaft 7 with the support sheet 4 in the pipe is inserted into the steel pipe and positioned;
and 4) putting the steel pipe with the central shaft 7 on a steel pipe marking press, pressing grooves inwards corresponding to the marking lines by a pressing wheel 8 on the marking press, forming the pressing grooves 2 on the outer wall of the steel pipe, simultaneously forming annular bulges 3 by inwards protruding the inner wall of the steel pipe, and just embedding the annular bulges 3 into the arc-shaped annular grooves 5 of the support sheets 4 in the steel pipe to be mutually occluded with the support sheets 4 in the steel pipe, so that the support sheets 4 in the steel pipe and the steel pipe body 1 are integrated into a whole, and the manufacturing of the bamboo joint type scaffold steel pipe is completed.
And 4) after the bamboo joint type steel pipe scaffold is manufactured, welding treatment is carried out at the occlusion part of the support sheet in the pipe and the annular bulge of the steel pipe in order to further increase the connection strength of the support sheet in the pipe and the steel pipe.
In the step 1), the interval of the scribing lines on the outer wall of the steel pipe is scribed according to the length of the bamboo joint, and the interval is generally 250-300 mm.
And 2) the groove depth of the arc-shaped ring groove on the inner tube supporting sheet in the step 2) is more than or equal to 1.5mm and less than or equal to 2 mm.
The pressing wheel in the step 4) is provided with a groove pressing lug 9, and the shape of the groove pressing lug 9 is matched with the groove pressing.
This bamboo joint type scaffold steel pipe, imitate the principle of bamboo's twisting resistance, set up the interior backing sheet of multi-disc pipe at the inside equidistant of steel pipe body, and interior backing sheet and steel pipe body form integral type bamboo joint type structure through the pinch roller crimping together, be provided with the arc annular on the interior backing sheet in advance, when making bamboo joint type scaffold steel pipe, only need put the interior backing sheet of pipe inside into the steel pipe body inside, put the steel pipe body on the indentator again, correspond the intraductal backing sheet through the pinch roller and carry out the roll extrusion, then when forming the indent on the steel pipe body outer wall, the inner wall of steel pipe body inwards extrudees the arc annular of embedding intraductal backing sheet under the effect of pressure, interlock each other with the arc annular, fix the intraductal backing sheet at the inside bamboo joint type structure that forms. Such structure can make the wall thickness of steel pipe reduce the minimum of regulation standard when, guaranteed the use strength and the torsional strength of steel pipe, the steel pipe is in the use because the effect of inside intraductal backing sheet, can not bending deformation, and in the use because the setting of indent on the steel pipe outer wall, the phenomenon of skidding of steel pipe in the use has effectively been prevented, the security performance of use has been guaranteed, and simultaneously, because the pipe wall of steel pipe can reduce minimum requirement, make the weight of whole steel pipe alleviate greatly, very big reduction workman's intensity of labour, the cost is also reduced, and bamboo joint type scaffold steel pipe can not change the preparation technology of steel pipe, and the preparation is convenient.
Specification of scaffold steel pipes: GJ 130 plus 2011 'safety technical specification of fastener type steel pipe scaffold for building construction' nominal outer diameter of a steel pipe is 48.3mm, and wall thickness is 3.6 mm. The surface is not treated generally, and is coated with antirust paint individually; the material of the rack pipe is as follows: q195, Q215 or Q235, length: can be processed according to the specification required by customers.
Claims (10)
1. The utility model provides a bamboo joint type scaffold steel pipe which characterized in that includes:
the steel pipe body (1) is used for lapping the thin-wall steel pipe of the scaffold; a plurality of pressing grooves (2) are annularly arranged on the outer wall of the steel pipe body (1) at intervals, and a plurality of annular bulges (3) are convexly arranged on the inner wall of the steel pipe body (1) corresponding to the pressing grooves (2);
the inner supporting sheet (4) is used for increasing the inner supporting sheet of the torsion of the steel pipe body; the support sheet (4) in the tube and the annular bulges (3) on the inner wall of the steel tube body (1) are arranged in a one-to-one correspondence manner, and the annular bulges (3) are meshed with the support sheet (4) in the tube.
2. The bamboo joint type scaffold steel pipe of claim 1, which is characterized in that: the intraductal backing sheet (4) be the ring piece structure, the circumference of intraductal backing sheet (4) on encircle and be equipped with arc annular (5), steel pipe body (1) inner wall on annular arch (3) imbed inside arc annular (5) and with arc annular (5) interlock each other.
3. The bamboo joint type scaffold steel pipe of claim 1, which is characterized in that: the center of the supporting sheet (4) in the tube is provided with a central perforation (6).
4. The bamboo joint type scaffold steel pipe of claim 1, which is characterized in that: the thickness of the support sheet (4) in the pipe is equal to the wall thickness of the steel pipe body (1).
5. The bamboo joint type scaffold steel pipe according to any one of claims 1 to 4, wherein: the support sheet (4) in the tube and the steel tube body (1) are pressed into a whole through the pressing wheel.
6. A manufacturing method of bamboo joint type scaffold steel pipes is characterized by comprising the following steps:
step 1) selecting a thin-wall steel pipe; and marking lines on the outer wall of the steel pipe at equal intervals;
step 2) manufacturing an in-pipe supporting sheet, namely manufacturing a plurality of circular in-pipe supporting sheets with the same thickness as the wall thickness of the thin-wall steel pipe at one time, punching a hole at the center of the circle of the in-pipe supporting sheet, and processing an arc-shaped annular groove on the circumference of the in-pipe supporting sheet to form the in-pipe supporting sheet;
step 3) penetrating the support sheet in the pipe on a central shaft (7) at the same interval as the indentation line on the outer wall of the steel pipe, and then penetrating the central shaft (7) with the support sheet in the pipe into the steel pipe and positioning;
and 4) putting the steel pipe with the central shaft (7) on a steel pipe marking press, pressing grooves inwards corresponding to the marking lines by pressing wheels (8) on the marking press, forming the pressing grooves (2) on the outer wall of the steel pipe, and simultaneously forming annular bulges (3) by inwards protruding inner walls of the steel pipe, wherein the annular bulges (3) are just embedded into arc-shaped ring grooves (5) of the support sheets (4) in the steel pipe and mutually occluded with the support sheets (4) in the steel pipe, so that the support sheets in the steel pipe and the steel pipe body are integrated, and the bamboo joint type scaffold steel pipe is manufactured.
7. The manufacturing method of the bamboo joint type scaffold steel pipe according to claim 6, characterized in that: and 4) after the bamboo joint type steel pipe scaffold is manufactured, welding treatment is carried out at the occlusion part of the support sheet in the pipe and the annular bulge of the steel pipe in order to further increase the connection strength of the support sheet in the pipe and the steel pipe.
8. The manufacturing method of the bamboo joint type scaffold steel pipe according to claim 6, characterized in that: in the step 1), the interval of the scribing lines on the outer wall of the steel pipe is scribed according to the length of the bamboo joint, and the interval is generally 250-300 mm.
9. The manufacturing method of the bamboo joint type scaffold steel pipe according to claim 6, characterized in that: and 2) the groove depth of the arc-shaped ring groove on the inner tube supporting sheet in the step 2) is more than or equal to 1.5mm and less than or equal to 2 mm.
10. The manufacturing method of the bamboo joint type scaffold steel pipe according to claim 6, characterized in that: a groove pressing bump (9) is arranged on the pressing wheel (8) in the step 4), and the shape of the groove pressing bump (9) is matched with that of the groove pressing (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711458877.5A CN108277968B (en) | 2017-12-28 | 2017-12-28 | Bamboo joint type scaffold steel pipe and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711458877.5A CN108277968B (en) | 2017-12-28 | 2017-12-28 | Bamboo joint type scaffold steel pipe and manufacturing method thereof |
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| CN108277968B true CN108277968B (en) | 2020-02-21 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112523251A (en) * | 2020-12-29 | 2021-03-19 | 中国长江三峡集团有限公司 | Offshore wind power large-diameter bionic bamboo joint steel pipe pile integrated with damping shock absorber |
| CN113356559B (en) * | 2021-06-13 | 2024-05-14 | 湖南金峰金属构件有限公司 | Cold extrusion scaffold positioning filling seat die |
| DE102022107159A1 (en) | 2022-03-25 | 2023-09-28 | Peri Se | Vertical support for a scaffold, scaffold and method for producing a vertical support |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1219761A2 (en) * | 2000-12-29 | 2002-07-03 | plettac assco GmbH & Co. KG. | Scaffolding tube |
| CN204225468U (en) * | 2014-10-20 | 2015-03-25 | 张家港市人和高精管有限公司 | A kind of scaffolding steel pipe structure |
| CN106192984A (en) * | 2016-07-26 | 2016-12-07 | 浙江大学城市学院 | The ring tube-in-tube pile associating reinforcing soft soil roadbed system of electric osmose and construction method |
-
2017
- 2017-12-28 CN CN201711458877.5A patent/CN108277968B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1219761A2 (en) * | 2000-12-29 | 2002-07-03 | plettac assco GmbH & Co. KG. | Scaffolding tube |
| CN204225468U (en) * | 2014-10-20 | 2015-03-25 | 张家港市人和高精管有限公司 | A kind of scaffolding steel pipe structure |
| CN106192984A (en) * | 2016-07-26 | 2016-12-07 | 浙江大学城市学院 | The ring tube-in-tube pile associating reinforcing soft soil roadbed system of electric osmose and construction method |
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