CN104452749B - The constructional method of a kind of reinforced concrete cast-in-situ pile tube - Google Patents

The constructional method of a kind of reinforced concrete cast-in-situ pile tube Download PDF

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Publication number
CN104452749B
CN104452749B CN201410652886.8A CN201410652886A CN104452749B CN 104452749 B CN104452749 B CN 104452749B CN 201410652886 A CN201410652886 A CN 201410652886A CN 104452749 B CN104452749 B CN 104452749B
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stake
bag
mould bag
hole
pile
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CN104452749A (en
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王新泉
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Shandong Hengxiang Municipal Highway Engineering Co., Ltd.
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Hangzhou Jiangrun Technology Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • E02D5/44Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0023Cast, i.e. in situ or in a mold or other formwork

Abstract

The present invention relates to the constructional method of a kind of reinforced concrete cast-in-situ pile tube, main construction procedure comprises: 1) holing with slurry wall protection becomes hole, and pore forming process, first with drill hole of drilling machine, uses a disc shaping machine reaming at the bottom of hole; 2) end is expanded at the bottom of adopting underwater concreting mode to build; (3) making Steel Reinforcement Cage, reinforcing bar protection cushion block is installed at stirrup interval, forms locating support; 3) pasting inner side mould bag and outer side mold bag inside and outside locating support, end plate is installed in bottom; 4) locating support is pressed into in hole together with mould bag; 5) perfusion slightly expanded concrete in the space of mould bag and outer side mold bag to the inside; 6) construction stake top obturator and cover plate after intensity is reached until pile concrete. The present invention arranges Steel Reinforcement Cage in cast-in-situ concrete thin-wall pipe pile, increases pile loading capability, reduces foundation soil to the impact of pile quality, and speed of application is fast, and quality is convenient to ensure, has good economic benefit and social benefit.

Description

The constructional method of a kind of reinforced concrete cast-in-situ pile tube
Technical field
The present invention relates to the constructional method of a kind of pouring pipe pile, in particular to the constructional method of a kind of concrete cast-in-situ pile tube inserting Steel Reinforcement Cage.
Background technology
Pile tube has that bearing capacity ofconcreting height, side friction be big and the advantage such as anti-bending strength is good, selected by the Soft Ground engineering got more and more. From construction technology, pile tube can be divided into prefabricated tubular pile and pouring pipe pile two kinds. Prefabricated tubular pile has that bearing capacity of single pile height, pile quality are reliable, the resistance to hammering of stake body and the advantage such as splitting resistance is good; But consider the factors such as transport and construction, need suitably to strengthen amount of reinforcement to gain in strength, the destructiveness that opposing is constructed and may be brought, thus add cost; Pouring pipe pile has that speed of application is fast, stake long can free adjustment, the advantage such as weak section that there is not pile extension place, its engineering adaptability is better, but adopts prior art difficulty of construction relatively big because of it, is not widely used in actual engineering.
The beginning of new century, Hohai University's exploitation cast in situs concrete thin-wall pile tube reinforced soft soil ground patented technology " sleeve pipe for weak sub-grade treatment becomes mould pouring pipe pile with large diameter machine " (ZL01273182.X) and construction technology " soft foundation composite ground base construction method for field pouring pipe pile with large diameter " (CN1367296A), the objects such as the construction of cast-in-place thin-wall pipe pile reaches that cost is low, the increase of the stability of bearing capacity height, ground and ground sedimentation reduction that adopt relevant art to carry out. But, common cast-in-situ concrete thin-wall pipe pile is plain concrete pile, and bearing capacity of pile is lower, has the prominent benefit of obvious spine and easily produce the quality problems such as necking down in immersed tube process.
In order to solve the problem, needing a kind of easy construction of invention badly, pile affects little by geologic condition, and verticality is convenient to control, is applicable to adopting the constructional method of the cast-in-place concrete thin-walled pile tube of immersed tube equipment.
Summary of the invention
It is an object of the invention to overcome deficiency of the prior art, it is provided that a kind of reliable in quality, speed of application are fast, affect little by geologic condition, the constructional method of the reinforced concrete cast-in-situ pile tube that pipe pile's lateral friction is big.
For realizing above-mentioned technical purpose, present invention employs following technical scheme:
The constructional method of this kind of reinforced concrete cast-in-situ pile tube, comprises the following steps:
1) preparing before construction, according to design paper, process workyard, measures pile foundation axis and absolute altitude, releases stake bit line according to axis;
2) holing with slurry wall protection becomes hole: during drilling construction, first steel pile casting is buried underground in cast-in-place thin-wall pipe pile position, and in casing, fill mud, then start to creep into, drilling process constantly to be supplemented mud at any time, makes in hole, to remain the head height higher than ground water table 1m��1.5m, hole to the stake body design degree of depth, hang in a disc shaping machine, at the bottom of hole, rotate the hole forming diameter and being greater than top stake body, squeezed hole process is constantly supplemented slurries;
3) expand end at the bottom of stake to build: expand end at the bottom of stake and adopt the mode of underwater concreting to construct, stretch to position at the bottom of hole by concrete placement pipe, casting concrete, on one side, put forward Grouting Pipe, simultaneously unnecessary in outlet orifice mud, concrete placement expands end absolute altitude at the bottom of the stake of design;
4) field fabrication Steel Reinforcement Cage, and the protection cushion block of the reinforcing bar in rectangular parallelepiped it is inserted at stirrup interval, form locating support, then inner side mould bag and outer side mold bag are pasted successively respectively the two ends protecting cushion block at reinforcing bar, end plate is installed bottom locating support;
5) the mould bag of band Steel Reinforcement Cage it is pressed into: with hanging apparatus by the mould bag vertical lifting of band Steel Reinforcement Cage, mould bag and inner side mould bag enclose and pour water in the space of conjunction or mud in hole is introduced mould bag laterally, and by same material by mould bag top seal, then the mould bag of band Steel Reinforcement Cage is pressed into in hole;
6) slightly expanded concrete is poured into: after locating support is pressed into, remove the closed material at mould bag top, slightly expanded concrete is built to, between inner side mould bag and outer side mold bag, getting rid of the water in mould bag or mud simultaneously, build and specify absolute altitude to stake body, form slightly expanded concrete stake body;
7) supporting plate of building that band hangs muscle is fixed on thin-wall pipe pile stake core place, build supporting plate with the cut to lengthen hanging muscle and position is installed, the upper end hanging muscle top and the main muscle of thin-wall pipe pile stake body is welded and fixed, then building casting concrete formation stake top obturator on supporting plate, it is parallel with slightly expanded concrete stake body top that stake top obturator builds height;
8) finally build cover plate, complete this whole construction process of reinforced concrete cast-in-situ pile tube.
As preferably: reinforcing bar described in step (4) protection cushion block two ends are reserved with bolt hole respectively, the junction of itself and outer side mold bag and inner side mould bag is also fixed by fixture block, screw rod and nut.
As preferably: the mould bag of inner side described in step (4) adopts geotextile that is waterproof and that thoroughly do not starch, and outer side mold bag adopts the geotechnological cloth bag of slurry thoroughly.
As preferably: end plate described in step (4) is annular, width is slightly larger than the thickness of slightly expanded concrete stake body, end plate upper surface is respectively arranged with mould bag and installs groove and reinforcement installation groove, when end plate is installed, main muscle bottom is inserted in reinforcement installation groove, and firm welding, inner side mould bag and outer side mold bag are filled in mould bag and installs in groove, and with mould bag material of the same race, mould bag is installed groove filling completely.
As preferably: when locating support described in step (5) is pressed into into hole, expand in end at the bottom of the insertion stake of locating support bottom.
As preferably: after described in step (6), slightly expanded concrete stake body has poured into, part mud, by outer side mold bag, infiltrates into soil around pile, forms slurry infiltration district.
As preferably: step (7) is built supporting plate and adopts circular wooden form or Sheet Steel Form.
The invention has the beneficial effects as follows:
(1) the present invention arranges Steel Reinforcement Cage in cast-in-situ concrete thin-wall pipe pile, effectively strengthens the supporting capacity of stake body, and Steel Reinforcement Cage is used as a part for locating support simultaneously, facilitates the construction of sinking mould bag.
(2) outer side mold bag of the present invention adopts the material that can thoroughly starch to make, and after building pile concrete, part slurry infiltration depanning bag, mixes with soil around pile, forms slurry infiltration district, increases the survey friction resistance of cast-in-place thin-wall pipe pile.
(3) arrange bottom thin-wall pipe pile of the present invention and at the bottom of concrete pile, expand end, improve pile-end soil body intensity, increase the end bearing capacity of thin-wall pipe pile.
(4) mould bag is pressed in ground after holing by the present invention again, and thin-wall pipe pile verticality is convenient to control, and geologic condition is less on the impact of pile quality.
(5) discarded slurry of the present invention stays the cavity place of thin-wall pipe pile stake core, decreases the process of mud, and speed of application is fast, and can reduce mud to the pollution of soil.
Accompanying drawing explanation
Fig. 1 is the structural representation after expansion end at the bottom of stake of the present invention has been constructed;
Fig. 2 is Steel Reinforcement Cage and the interface chart of interior external mold bag;
Fig. 3 is the Section A-A figure of the interface chart of Steel Reinforcement Cage and interior external mold bag;
Fig. 4 is that in the present invention, external mold bag and locating support connect connection detail;
Fig. 5 is end plate sectional view of the present invention;
Fig. 6 is the structural representation after mould bag of the present invention is pressed into into hole;
Fig. 7 to Fig. 8 is the structural representation after a kind of reinforced concrete cast-in-situ tube pile construction of the present invention completes and section B-B figure;
Fig. 9 is the construction process figure of the constructional method of a kind of reinforced concrete cast-in-situ pile tube of the present invention.
Description of reference numerals: slightly expanded concrete stake body 1, outer side mold bag 2, inner side mould bag 3, main muscle 4; stirrup 5, expands end 6, slurry infiltration district 7, stake top obturator 8 at the bottom of stake; cover plate 9, end plate 10, mud 11, hangs muscle 12; build supporting plate 13, a disc shaping machine 14, fill mud 15; reinforcing bar protection cushion block 16, fixture block 17, screw rod 18; nut 19, groove 20 installed by mould bag, reinforcement installation groove 21.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further. Although the present invention will be described in conjunction with better embodiment, but should know, do not represent and limit the invention in described embodiment. On the contrary, the present invention by contain can be included in attached claim book limit the present invention scope in alternative, modified version and etc. jljl.
With reference to, shown in Fig. 1, adopting rig and a disc shaping machine 14 one-tenth hole. First drill hole of drilling machine is adopted, borehole diameter is 1250mm, boring hangs in a disc shaping machine 14 to degree of depth 20m��25m and carries out reaming, counter bore diameter 1300mm��1500mm, reaming degree of depth 2m��3m, the mud 11 that pore forming process adopts and water, clay (wilkinite) and additive configure and become carries out retaining wall. Then pour into reaming place and expand end 6 at the bottom of the concrete formation stake of C30 strength grade.
With reference to shown in Fig. 2 and Fig. 3, adopt nominal diameter be the HRB335 Twisted Steel of 20mm as main muscle 4, select diameter to be that the HPB300 reinforcing bar of 10mm makes Steel Reinforcement Cage as stirrup 5, Steel Reinforcement Cage diameter 1000mm, length 22m��26m. After fabrication of reinforcing cage completes; on stirrup 5, interval is laid reinforcing bar protection cushion block 16 and is formed locating support; reinforcing bar protection cushion block 16 is prefabricated into rectangular parallelepiped; length is 400mm; it is highly 200mm��250mm; width is 100mm��150mm, and it is the bolt hole of 20mm that reinforcing bar protection cushion block 16 is horizontally disposed with 2 row's diameters.
With reference to shown in Fig. 4, after locating support completes, on locating support, paste inner side mould bag 3 and outer side mold bag 2 that thickness is 8mm��10mm, adhesive-bonded geotechnique's cloth that wherein inner side mould bag 3 is made up, this material both water tight and air tight of polypropylene regenerated fiber; Outer side mold bag 2 adopts the permeable material of grout. With tackiness agent, inner side mould bag 3 and outer side mold bag 2 are fixed on reinforcing bar protection cushion block 16 when pasting, it are the bolt hole passed on reinforcing bar protection cushion block 16 of 18mm screw rod 19 with diameter, and fix inner side mould bag 3 and outer side mold bag 2 further with fixture block 17 and nut 19.
With reference to shown in Fig. 5, inner side mould bag 3 and outer side mold bag 2 are pasted after having fixed, annular endplate 10 that is prefabricated by Q345 steel and that become is installed bottom locating support, the reserved mould bag of end plate 10 upper surface installs groove 20 and reinforcement installation groove 21, wherein mould bag installs groove 20 width 10mm��12mm, reinforcement installation groove 21 width 20mm��21mm. When end plate 10 is installed, main muscle 4 bottom is inserted in reinforcement installation groove 21 and firm welding, inner side mould bag 3 and outer side mold bag 2 are filled in mould bag and installs in groove 20, fixing with tackiness agent filling. So far, form a closed space between inner side mould bag 3, outer side mold bag 2 and end plate 10.
With reference to shown in Fig. 6, with hanging machine, locating support is sling, and mud 15 is filled in perfusion in enclosed space between inner side mould bag 3, outer side mold bag 2 and end plate 10, then sinks in hole by locating support, insert bottom locating support and at the bottom of stake, expand end 6 upper surface 1m��1.5m place once.
With reference to, shown in Fig. 7 to Fig. 8, locating support pours into slightly expanded concrete in mould bag, and replaces out by filling mud 15 after sinking to the design degree of depth, forms slightly expanded concrete stake body. Part mud, through outer side mold bag 2, is mixed to form slurry infiltration district 7 with soil around pile. After slightly expanded concrete stake body 1 intensity reaches requirement, the mud 11 in boring can be extracted out and cause next stake position place, also can be retained in thin-wall pipe pile stake core place. Then placing circular wooden form or Sheet Steel Form as building supporting plate 13 at stake end, building supporting plate 13 by diameter is that 10mm hangs muscle 12 and is fixed on specified location, hangs muscle 12 top and welds with the main muscle 4 stretching out slightly expanded concrete stake body 1. Then the concrete building C30 strength grade forms stake top obturator 8 and cover plate 9.
With reference to, shown in Fig. 9, the construction process of reinforced concrete cast-in-situ pile tube comprises:
1) preparing before construction, according to design paper, process workyard, measures pile foundation axis and absolute altitude, releases stake bit line according to axis;
2) holing with slurry wall protection becomes hole: during drilling construction, first steel pile casting is buried underground in cast-in-place thin-wall pipe pile position, and in casing, fill mud, then start to creep into, drilling process constantly to be supplemented mud at any time, make in hole, to remain that the head height higher than ground water table 1��1.5m should adjust mud prescription and proportion simultaneously according to soil property situation, hole to the stake body design degree of depth, hang in a disc shaping machine, at the bottom of hole, rotate the hole forming diameter and being greater than top stake body, squeezed hole process is constantly supplemented slurries.
3) expand end 6 at the bottom of stake to build: expand end 6 at the bottom of stake and adopt the mode of underwater concreting to construct, position at the bottom of hole is stretched to by concrete placement pipe, casting concrete on one side, Grouting Pipe is put forward on one side, sending mud unnecessary in hole, concrete placement expands end 6 absolute altitude at the bottom of the stake of design simultaneously;
4) field fabrication Steel Reinforcement Cage; and special reinforcing bar protection cushion block 16 it is inserted at interval, stirrup 5 place; then inner side mould bag 3 and outer side mold bag 2 are connected in turn on reinforcing bar protection cushion block 16; part connects node and fixture block 17 can be adopted to fold with reinforcing bar protection cushion block 16; and connect by screw rod 18 and the fixing mode of nut 19, the mode that all the other nodes adopt binding agent to paste connects.Then end plate 10 is installed, main muscle 4 bottom is inserted in reinforcement installation groove, and firm welding, inner side mould bag 3 and outer side mold bag 2 are filled in mould bag and installs in groove 20, and with mould bag material of the same race, mould bag is installed groove and clog full;
5) the mould bag of band Steel Reinforcement Cage it is pressed into: with hanging apparatus by the mould bag vertical lifting of band Steel Reinforcement Cage, mould bag 2 and inner side mould bag 3 enclose and pour water in the space of conjunction or mud in hole is introduced mould bag laterally, and by same material by mould bag top seal, then the mould bag of band Steel Reinforcement Cage is pressed into in hole, it is pressed into bottom mould bag and expands in end 6 at the bottom of the stake built;
6) slightly expanded concrete is built: mould bag is pressed into specified location, remove the closed material at mould bag top, slightly expanded concrete is built between inner side mould bag 3 and outer side mold bag 2, get rid of the water in mould bag or mud simultaneously, build to stake body appointment absolute altitude, form slightly expanded concrete stake body 1, and extract the mud of thin-wall pipe pile centre-drilling hole;
7) supporting plate 13 of building that band hangs muscle 12 is fixed on thin-wall pipe pile stake core place, build supporting plate 13 with the cut to lengthen hanging muscle 12 and position is installed, the upper end hanging muscle 12 top and the main muscle 4 of thin-wall pipe pile stake body is welded and fixed, then building casting concrete formation stake top obturator 8 on supporting plate 13, it is parallel with slightly expanded concrete stake body 1 top that top obturator 8 builds height;
8) finally build cover plate 12, complete this whole construction process of reinforced concrete cast-in-situ pile tube.

Claims (7)

1. the constructional method of a reinforced concrete cast-in-situ pile tube, it is characterised in that, comprise the following steps:
1) preparing before construction, according to design paper, process workyard, measures pile foundation axis and absolute altitude, releases stake bit line according to axis;
2) holing with slurry wall protection becomes hole: during drilling construction, first steel pile casting is buried underground in cast-in-place thin-wall pipe pile position, and in casing, fill mud, then start to creep into, drilling process constantly to be supplemented mud at any time, makes in hole, to remain the head height higher than ground water table 1m��1.5m, hole to the stake body design degree of depth, hang in a disc shaping machine (14), at the bottom of hole, rotate the hole forming diameter and being greater than top stake body, squeezed hole process is constantly supplemented slurries;
3) expand end (6) at the bottom of stake to build: expand end (6) at the bottom of stake and adopt the mode of underwater concreting to construct, position at the bottom of hole is stretched to by concrete placement pipe, casting concrete on one side, Grouting Pipe is put forward on one side, simultaneously unnecessary in outlet orifice mud, concrete placement expands end (6) absolute altitude at the bottom of the stake of design;
4) field fabrication Steel Reinforcement Cage, and protection cushion block of the reinforcing bar in rectangular parallelepiped (16) it is inserted at stirrup (5) interval, form locating support, then inner side mould bag (3) and outer side mold bag (2) are pasted successively respectively the two ends protecting cushion block (16) at reinforcing bar, end plate (10) is installed bottom locating support;
5) the mould bag of band Steel Reinforcement Cage it is pressed into: with hanging apparatus by the mould bag vertical lifting of band Steel Reinforcement Cage, mould bag (2) and inner side mould bag (3) are enclosed and are poured water in the space of conjunction or mud in hole is introduced mould bag laterally, and by same material by mould bag top seal, then the mould bag of band Steel Reinforcement Cage is pressed into in hole;
6) slightly expanded concrete is poured into: after locating support is pressed into, remove the closed material at mould bag top, slightly expanded concrete is built between inner side mould bag (3) and outer side mold bag (2), get rid of the water in mould bag or mud simultaneously, build and specify absolute altitude to stake body, form slightly expanded concrete stake body (1);
7) supporting plate (13) of building that band hangs muscle (12) is fixed on thin-wall pipe pile stake core place, build supporting plate (13) with the cut to lengthen hanging muscle (12) and position is installed, the upper end hanging muscle (12) top and the main muscle of thin-wall pipe pile stake body (4) is welded and fixed, then building upper casting concrete formation stake top obturator (8) of supporting plate (13), it is parallel with slightly expanded concrete stake body (1) top that height is built on stake top obturator (8);
8) finally build cover plate (9), complete this whole construction process of reinforced concrete cast-in-situ pile tube.
2. the constructional method of reinforced concrete cast-in-situ pile tube according to claim 1; it is characterized in that: step 4) described in reinforcing bar protection cushion block (16) two ends be reserved with bolt hole respectively, it is fixing that fixture block (17), screw rod (18) and nut (19) are also passed through in its junction with outer side mold bag (2) and inner side mould bag (3).
3. the constructional method of reinforced concrete cast-in-situ pile tube according to claim 1, it is characterized in that: step 4) described in inner side mould bag (3) adopt geotextile that is waterproof and that thoroughly do not starch, outer side mold bag (2) adopts the geotechnological cloth bag of thoroughly slurry.
4. the constructional method of reinforced concrete cast-in-situ pile tube according to claim 1, it is characterized in that: step 4) described in end plate (10) be annular, width is slightly larger than the thickness of slightly expanded concrete stake body (1), end plate (10) upper surface is respectively arranged with mould bag and installs groove (20) and reinforcement installation groove (21), when end plate (10) is installed, main muscle (4) bottom is inserted in reinforcement installation groove (21), and firm welding, inner side mould bag (3) and outer side mold bag (2) are filled in mould bag installs in groove (20), and with mould bag material of the same race, mould bag is installed groove (20) filling completely.
5. the constructional method of reinforced concrete cast-in-situ pile tube according to claim 1, it is characterised in that: step 5) described in the mould bag of band Steel Reinforcement Cage when being pressed into into hole, be pressed into bottom the mould bag of band Steel Reinforcement Cage and expand in end (6) at the bottom of stake.
6. the constructional method of reinforced concrete cast-in-situ pile tube according to claim 1, it is characterized in that: step 6) described in after slightly expanded concrete stake body (1) poured into, part mud is by outer side mold bag (2), infiltrate into soil around pile, form slurry infiltration district (7).
7. the constructional method of reinforced concrete cast-in-situ pile tube according to claim 1, it is characterised in that: step 7) in build supporting plate (13) and adopt circular wooden form or Sheet Steel Form.
CN201410652886.8A 2014-11-17 2014-11-17 The constructional method of a kind of reinforced concrete cast-in-situ pile tube Active CN104452749B (en)

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CN105672256A (en) * 2016-02-23 2016-06-15 中建三局集团有限公司 Underwater variable-label synchronous continuous pouring method and device for steel tube concrete upright column pile
CN106498966A (en) * 2016-11-18 2017-03-15 中国电建集团成都勘测设计研究院有限公司 Impervious wall construction structure
CN106759272B (en) * 2017-02-25 2018-09-14 湖北思泽新能源科技有限公司 A kind of inflation prestressed steel pipe of concrete guard wall
CN106759294B (en) * 2017-02-27 2018-09-14 湖北思泽新能源科技有限公司 The composite pile that deposited reinforced concrete pile is combined with inflation prestressed steel pipe
CN107130633A (en) * 2017-07-12 2017-09-05 蔡荪萍 A kind of steel tube concrete clay model bag stake is combined soil-baffling structure construction technology
CN110295602A (en) * 2019-04-24 2019-10-01 浙江省钱塘江管理局勘测设计院 A kind of underwater concrete pouring technique

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JPH03206212A (en) * 1990-01-05 1991-09-09 Ichitaro Torii Construction method of earth support in tubular pile and tubular pile
CN103388333A (en) * 2013-07-25 2013-11-13 中铁十六局集团有限公司 Construction process for carrying out construction on interlocking pile by adopting rotary drilling rig and mud protection wall method
CN103510511B (en) * 2013-09-26 2015-05-27 鸿厦建设有限公司 Top-reinforced cast-in-place concrete thin-wall pipe pile and construction method
CN104005404B (en) * 2014-05-16 2016-01-13 德州市公路工程总公司 A kind of pile for prestressed pipe of outsourcing active material pile body and construction method

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Patentee before: Hangzhou Jiang Run Science and Technology Ltd.