CN108060674B - Prefabricated assembled steel bone concrete support system - Google Patents
Prefabricated assembled steel bone concrete support system Download PDFInfo
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- CN108060674B CN108060674B CN201611009338.9A CN201611009338A CN108060674B CN 108060674 B CN108060674 B CN 108060674B CN 201611009338 A CN201611009338 A CN 201611009338A CN 108060674 B CN108060674 B CN 108060674B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
In the foundation pit enclosure engineering, in order to solve the defects of complicated construction, low speed, high manufacturing cost, difficult dismantling and the like of the traditional inner support system, the invention provides a brand-new method for manufacturing an assembly type steel bone concrete support, which comprises the following steps: the reusable prefabricated steel reinforced concrete member and a newly developed special connecting piece are combined with the cast-in-place enclosure wall capping beam or the enclosing purlin beam and the supporting pile to be spliced and installed on site to form a complete supporting system. After the excavation is finished, the movable tunnel can be conveniently disassembled for repeated use; saves resources and meets the requirements of low-carbon and green engineering.
Description
Technical Field
The invention relates to a method for manufacturing a supporting system for deep foundation pit excavation enclosure engineering, which establishes a set of complete prefabricated steel framework concrete supporting system and fills a blank in the field of foundation pit enclosure engineering.
Background
With the continuous development and utilization of underground space, the enclosure of the foundation pit becomes the hottest project of the current geotechnical engineering industry. Foundation pit support engineering currently shows two major trends: firstly, the plane range of the foundation pit is continuously enlarged; and secondly, the excavation depth of the foundation pit is continuously deepened. The method is characterized in that a retaining wall is arranged on the periphery of a foundation pit, and a support system is erected inside the foundation pit, so that the most widely applied foundation pit retaining method with the highest safety degree in the current deep foundation pit engineering is adopted.
At present, the most common methods of foundation pit supporting systems are cast-in-place reinforced concrete supporting systems and assembled steel pipe supporting systems. The cast-in-situ reinforced concrete support system has the advantages of good integrity, good collision resistance in the excavation-resistant process of the structure, high safety and the like, and is the most common support system in the current deep foundation pit engineering; but it has the disadvantages of complex construction, slow speed, high cost, difficult dismantling, etc. The assembled steel pipe support system is widely applied to foundation pit support engineering at present, and has the advantages that: the construction speed is fast, recoverable and reusable, but it also has obvious shortcoming: the integral rigidity is lower, the anti-collision capacity is poor, the support span can not be overlong, the application of the support span in plane large-scale foundation pit support is limited, the safety is low, the accident rate is high, the support span is mainly combined with reinforced concrete support to be used in narrow and long municipal engineering pipeline foundation pits and subway deep foundation pits, and the application of the support span in large-scale foundation pit engineering is eliminated.
The methods of assembling prestressed section steel combined support and fish-bellied tension section steel combined support which appear in recent years are still in the development and trial-and-development stages, but all have the defect of insufficient rigidity of a support system.
Disclosure of Invention
In order to solve the problems of the support systems, the invention provides a prefabricated assembled steel bone concrete support system which not only has the advantage of high integral rigidity of a cast-in-situ reinforced concrete support system, but also can overcome the defects of complicated construction procedures and difficult support dismantling of the cast-in-situ reinforced concrete support.
The invention provides a brand-new method for manufacturing an assembly type steel bone concrete support aiming at foundation pit enclosure engineering. The reusable prefabricated steel reinforced concrete member and a newly developed special connecting piece are combined with the cast-in-place enclosure wall capping beam or the enclosing purlin beam and the supporting pile to be spliced and installed on site to form a complete supporting system. After the excavation is finished, the movable tunnel can be conveniently disassembled for repeated use. Saves resources and meets the requirements of low-carbon and green engineering.
The invention has the beneficial effects that:
aiming at the foundation pit enclosure engineering, a brand-new method for assembling type steel bar concrete supports is provided, and the defects that the construction process of cast-in-place steel bar concrete supports is complicated and the supports are difficult to disassemble are overcome; the method has the characteristics of high construction speed, capability of recycling and reusing, resource saving, accordance with the requirements of low-carbon and green engineering and the like. Has important engineering application value and wide development prospect.
Drawings
The invention is described below with reference to the accompanying drawings and specific embodiments.
Fig. 1.1 to 1.5 illustrate the support distribution and the connection method between the various foundation pit forms in embodiment 1 of the present invention.
Fig. 2.1 to 2.3 illustrate the practice of each prefabricated support member in the embodiment of the present invention.
Fig. 3.1 to 3.6 illustrate the connection method of the middle connecting piece of the upper layer and the nodes of the upper layer in the embodiment of the invention.
Fig. 4.1-4.2 show the connection of the edge connectors and the capping or purlin beams with the support members according to the embodiment of the present invention.
Fig. 5 shows the connection of the supporting piles and the prefabricated parts in the nodes of the lower layer according to the embodiment of the invention.
Wherein:
1-prefabricating a main support member;
2-prefabricated web members (including diagonal bracing members);
3-upper middle connecting piece (comprising lattice type supporting pad beam and marking bottom plate) and hollow connecting base with pile cap
And standardized connecting bottom plate
Freely movable connecting bottom plate
)；
4-supporting piles;
5-capping beam or enclosing purlin beam;
6-edge connecting piece;
7-overhanging section;
8-edge embedded part;
9-temporary connection;
firstly, steel skeleton is wrapped outside;
② concrete;
③ a steel pipe;
fourthly, the pipe pile;
fifthly, a steel reinforced concrete end;
sixthly, forming a plastic hollow pipe;
seventhly, lattice type supporting cushion beams;
eighthly, marking the bottom plate;
ninthly-bolt;
r is pull rod;
L1-prefabricating the marked length of the main support member in the middle;
L1' -the marked lengths of the side prefabricated main support members and the orthogonal web members;
L2-the marked length of the middle prefabricated web member or diagonal member;
L2' -marking the length of the side prefabricated web member or diagonal member;
L3the length of the mark of the main supporting member of the adjusting section is determined according to the situation of the engineering site;
L3' adjusting the length of the marking of the section diagonal member, and determining according to the situation of the engineering site;
a, the overhanging length of the overhanging section (when a is more than or equal to 1500mm, a supporting pile is added at the node);
b, the distance from the axis of the enclosing wall capping beam or the enclosing purlin beam to the edge connecting piece;
c-length of temporary connection 9 in fig. 1.1 (c ═ L)1Or L2In the meantime, 9 adopts a standard rod body, c is not equal to L1Or L2In time, a temporary steel structure is used for connection).
Except for the adjusting section rod body represented by a dotted line segment and the member close to the edge of the enclosure wall, the rest prefabricated support members all adopt standard rod bodies, namely the lengths of the members are L1Or L2。
The concrete supporting component and the connecting node are manufactured as follows
Firstly, determining the plane distribution of a support system, and analyzing the plane distribution form of a large number of foundation pit support systems to find that the distribution is regular, and most of the distribution is longitudinal and transverse multi-support and multi-oblique arrangement of corners. Therefore, the invention provides a flexible combination of a prefabricated main support member 1, a web member 2 and a middle connecting node 3, and by combining a support pile 4 at the node, a capping beam or surrounding purlin beam 5 at the periphery of a foundation pit, an edge connecting member 6, an extending section 7 of the capping beam or surrounding purlin beam and an edge embedded part 8 embedded in the extending section, the distribution of the support system is planned according to the actual shape of the foundation pit by design, and the support system is spliced on site to form a complete support system, which is shown in fig. 1.1-1.5.
2. The practice of prefabricating the main support member in the present invention is seen in fig. 2.1. The main supporting member is formed by wrapping a steel skeleton outside, arranging steel pipes inside and pouring concrete, and has the characteristics of high compression strength and bending shear strength, high rigidity, relatively light weight, simple connection with specific connecting nodes, anti-collision of the steel skeleton member outside wrapping steel sections, convenient realization of reuse and the like. The prefabricated main support member can also adopt a method of wrapping steel pipes outside and lining concrete pipe piles on the inner wall, and connecting steel concrete ends at two ends are convenient to be connected with each other, see figure 2.3; and aiming at different foundation pits, the method and the size of the member are uniform, and the marking length b is 8-15 m, generally 10 m. The supporting members used for supporting each layer are square in section and same in size, the side length of the section for supporting the upper part is 550-750 mm, the side length is generally 700mm, and the weight is about 5T; the side length of the lower support section is generally 800-1000 mm, and the weight is about 8-10T. Thus, the installation of the components can be performed with a conventional crane or excavator.
3. The prefabricated web member 2 in the invention is basically the same as the main supporting member in the way of referring to fig. 2.2, the steel framework is arranged outside, and the plastic hollow pipe is arranged inside, so that the strength requirement of the member can be met and the cost can be saved; similarly, the prefabricated web member may be made of steel pipe wrapped with steel pipe and concrete pipe pile lined in the inner wall, and the two ends of the prefabricated web member are connected to form steel concrete ends for easy connection. To facilitate the splicing, mounting and dismounting, and the repeated use, the member is also of uniform construction, uniform size, and has the same cross-sectional width as the main support member 1.
4. The invention designs an upper horizontal support middle connecting piece 3 (figure 3.1) and realizes the connection of various components of a support system on site. The connection method comprises the following steps: three-way connections (fig. 3.2), cross connections (fig. 3.3), multi-way connections (fig. 3.4 and fig. 3.5); the cross connection in fig. 3.3 is taken as an example for illustration: firstly, the lattice type pad beam is arranged through a temporary bracket
Welding on the top of the supporting pile 4, covering a standardized supporting connection base plate on the pad beam, placing the prefabricated main supporting component 1 positioned on the same axis at two sides of the supporting pile 4 in the design drawing on the upper portion of the connection base plate, positioning the main supporting component by using a theodolite or a total station, preliminarily connecting the pad beam with the connection base plate, the main supporting component and the connection base plate by using bolts, installing the web member 2 according to the step, and after the installation is finished, using upper and lower triangular armpit plates at the orthogonal position of the prefabricated main supporting component 1 and the prefabricated web member 2
The preliminary fixation is carried out through bolts, and the supporting component and the triangular armboards on the two sides
The pull rod (R) is used for connection and reinforcement to enhance the overall stability; the main support is additionally arranged between the two main support components to transfer the force section steel
End socket end plate for tightly propping up inner support member
For transmitting the supporting shaft force. Other node connection modes can be implemented according to the cross connection mode. The connection not only can meet the mechanical requirements of various buckling resistance, bending resistance, shearing resistance and the like of the support, but also has convenient construction and assembly and simple disassemblyAnd can be repeatedly used. A wide variety of connecting rod pieces in a complex supporting system are easily connected through a universal internal universal connecting piece.
5. In the invention, another method for making the middle connecting piece 3 of the upper-layer horizontal support aiming at the enclosure engineering of one or more layers of supports is described by taking fig. 3.6 as an example: the top of the steel frame upright post supporting pile 4 is connected with a hollow steel plate base with pile caps at four corners through bolts
The lower part is connected with a connecting plate which is provided with a hole and can freely move
Support connecting bottom plate with upper labeling
Connecting plate
Hollow steel plate
Support connecting bottom plate
The three plates are bolted together and the subsequent installation step is the same as in step 4. The connection method can also solve the general problems of various deviation and the like existing in the process of driving and setting the supporting pile, can meet the requirements of foundation pit enclosure on various stress performances of a supporting system, can realize the unification of components, and enables the installation and the disassembly to be simple and convenient.
6. The invention provides a method for connecting a support system with a cast-in-place capping beam or an enclosing purlin beam 5 on an enclosure wall along the periphery of a foundation pit (figures 4.1-4.2), wherein the support system is connected with the periphery in various connection modes, and the connection modes are shown in figures 1.1-1.5: the supporting member is connected with the peripheral beam in an orthogonal mode, an oblique mode, a positive oblique mode, a double oblique mode and a three-rod mode. Illustrated with the orthogonal connections shown in fig. 4.1: firstly, firmly connecting an edge connecting piece 6 with an embedded piece 8 in a capping beam or a surrounding purlin beam, paying off and positioning a main supporting axis, then placing the end part of a main supporting member 1 on the upper part of the edge connecting piece 6, moving and adjusting the main supporting member 1 to enable the axis to coincide with a designed main supporting axis, carrying out bolt connection on the main supporting member 1 and the edge connecting piece 6 through a set bolt hole, applying prestress on the main supporting member 1 according to the design requirement, tightly jacking the main supporting member, screwing bolts of each part, and finishing the assembly. All connections are made by means of a uniform edge connecting member 6. The invented edge connecting member 6 has the capability of bearing the axial pressure and lateral acting force transmitted by the support, and can properly apply pre-pressure to tightly push the assembled support member, so that the support member can effectively play a role of support. The side connecting components 6 are also unified, and are convenient to assemble and disassemble.
The support system is connected with a capping beam or a surrounding purlin beam at the edge of a foundation pit, and the length of the integrated support system after assembly is adjusted through the length of the cast-in-situ reinforced concrete beam overhanging section 7, so that the assembled prefabricated steel rib support is suitable for foundation pit engineering in various forms and scales.
When the supporting system is arranged, the standard marked length of the middle supporting component is firstly used as a unit for arrangement, the difference between the standard marked length of the middle supporting component and the surrounding enclosure wall is set aside, cast-in-place overhanging picking length is adopted for filling, and the problems of unification and universality of the supporting system components are conveniently solved.
7. The invention provides a uniform internal universal connecting piece method (figure 5) aiming at a multilayer lower layer support, and the connection mode can refer to the connection modes of figures 3.2-3.5. In actual engineering, a steel structure supporting pile may have vertical deviation, the center position of the pile may deviate to various directions, the section of the steel structure itself may deviate in rotation, and the like, and these all need to determine specific conditions after excavation of a foundation pit, so that it is difficult to realize assembly of standardized components. The connecting piece adopts a uniform internal connection mode, and provides a simple method for connecting with the supporting pile, so that various connection modes of the lower supporting standard component can be realized. The internal connecting piece of the invention bears the lateral pressure of the enclosure soil and water transmitted by the enclosure wall through the peripheral connecting piece, the self weight of the supporting member and the bending shear transmitted by the load applied by the member, and transmits the forces to the steel frame supporting column.
The method comprises the following specific implementation steps:
firstly, according to the plane shape of the foundation pit, the excavation depth, the rock soil body characters in the excavation depth range and the surrounding environment of the foundation pit, the plane distribution of the support system and the number of layers of the required support system are determined according to the traditional method. According to a planned support plane arrangement diagram, the standardized prefabricated steel skeleton main support members 1 and the standardized prefabricated steel skeleton web member 2 are arranged according to the requirements of marking sizes, the position and the number of each middle connecting point 3 are determined, meanwhile, the distribution and the number of the required support members 1 and the required web member 2 are determined, and the size of the support along the periphery of the foundation pit capping beam or the extending section 7 of the purlin beam 5 and the distribution and the number of the side connecting pieces 6 are determined.
Secondly, the enclosure pile wall is arranged along one circle of the foundation pit according to requirements, and the steel-structure support pile 4 is arranged in the middle of the foundation pit at the planned middle connecting point according to the traditional method.
Constructing a capping beam 5 at the top of the enclosure pile wall and an overhanging section 7 of each supporting edge connecting point according to requirements, and embedding an edge connecting embedded part 6;
fourthly, measuring the deviation of the steel support upright post 4, connecting a universal connecting piece 3 arranged in the upper support of the invention with the top of the steel support upright post 4 of the support pile, aligning the center of the internal universal connecting piece 3 with the center of the designed pile position, and then preliminarily connecting each prefabricated support member 1 and each web member 2 with the internal connecting piece by using bolts;
fifthly, primarily connecting the supporting member 1, the web member 2 and the capping beam 5 on the overhanging connection points of the capping beam 5 on the periphery of the foundation pit by using the connection mode of the invention;
after the plane arrangement of all the support systems is formed, measuring and adjusting the position of each prefabricated connecting component to enable the prefabricated connecting component and the main support 1 to be approximately positioned on the same axis, wherein the deviation degree meets the design requirement; secondly, applying pre-pressure to the main support member 1 in opposite directions according to design requirements at connecting points of two end edges of the main support to enable the main support member and the corresponding web members to be tightly pressed; and finally screwing the connecting bolts of all the internal and external connecting points, thus completing the upper support.
And seventhly, for the foundation pit with the layer of support, after the upper support is formed, directly excavating to the pit bottom, and constructing a foundation slab. For the deep foundation pit with multi-layer supports, after the upper support is formed, the deep foundation pit can be directly excavated to the elevation of the lower support bottom, each connecting piece member in the lower support is connected with the support steel upright post according to the method of the invention at each internal connecting point, so that the center of the internal connecting piece is consistent with the center of the designed upright post, and then the connecting operation of assembling the lower support 1 and the web member 2 can be started.
Constructing a peripheral purlin beam 5 according to design requirements along the periphery of the foundation pit synchronously, pouring an overhanging section 7 according to the platform distribution condition of supports and an upper support method, embedding a lower peripheral support connecting piece 6, and forming primary connection between the support member 1 and the web member 2 and the peripheral connecting piece 6.
Ninthly, supporting the main support with the upper part, measuring and adjusting each assembled and formed main support to enable the main support axis to form a straight line, enabling the deviation to meet the design requirement, applying pre-pressure to the two peripheral ends of the main support in opposite directions according to the design requirement, jacking the main support, finally screwing bolts ninthly of all internal and external connection points to form the lower support. The lower multi-layer support is performed as described above.
After the lower support is completed, the bottom plate can be excavated, a foundation bottom plate structure is constructed, after the foundation bottom plate structure is completed, all layers of supports can be dismantled from top to bottom according to the enclosure design requirements, and all the dismantled components are used in a new construction site.
The invention simplifies a complex foundation pit enclosure engineering support system into two standardized and reusable prefabricated components, namely a support component and a web member, and two standardized and reusable connecting components, namely an internal connecting component and a peripheral connecting component; the supporting system is formed by simple splicing and assembling, and the foundation pit is convenient to disassemble after the foundation pit engineering is completed so as to be used next time. The construction speed is improved, the construction cost is reduced, the construction can be repeatedly utilized, and the low-carbon and environment-friendly engineering concept is realized.
Claims (6)
1. A prefabricated assembled steel bone concrete support system is characterized in that: the plane distribution form of the support system is determined according to the plane shape of the foundation pit, only two prefabricated standardized components, namely a support component and a web member, are needed, and a middle connecting piece at the intersection of the middle support component and two connecting components, namely a middle connecting piece and an edge connecting piece connected with an edge embedded piece of a capping beam or a surrounding purlin beam are combined; the prefabricated marking components, the middle connecting piece, the side connecting piece, the capping beam with the peripheral extending section and the surrounding purlin beam are combined to form a complete supporting system aiming at the plane shape of the foundation pit; the middle connecting piece is composed of a lattice type pad beam and a connecting bottom plate, the connecting piece adopts the lattice type pad beam to be welded with the supporting pile through a bracket, a standardized connecting bottom plate is arranged above the lattice type pad beam, and the bottom plate is provided with a plurality of selectable connecting holes so as to solve the problem that the supporting pile is difficult to connect due to deviation when the supporting pile is arranged; placing the prefabricated supporting members and the prefabricated web member on the connecting bottom plate according to requirements, and connecting the prefabricated supporting members and the prefabricated web member with the supporting members and the web member through bolt holes in the connecting bottom plate; the edge connecting piece is connected with an edge embedded part in the capping beam or the purlin beam, then the supporting member is placed on the edge connecting piece, the supporting member is connected through a bolt hole arranged on the edge connecting piece by a bolt, pre-stress is applied to the supporting member, the supporting member is tightly propped, bolts of all parts are screwed, and the assembly of the support is completed; the side connecting piece is a right-angle component with a bolt hole, and the external side connecting piece is connected with the side embedded part or the supporting component of the capping beam and the surrounding purlin beam in a bolting mode, and can be detached and reused.
2. The prefabricated assembled steel bone concrete supporting system of claim 1, which is characterized in that: the supporting member and the web member which form the supporting system are formed by an outer-wrapped profile steel serving as a framework, an inner hollow steel pipe and concrete poured between the profile steel framework and the hollow steel pipe; because the stress is small, the plastic pipe is arranged inside the web member to replace the steel pipe; and the two ends of the prefabricated marking component are provided with a steel head and a drill hole which are outwards raised and reinforced, and are used for being connected with a connecting piece through bolts.
3. The prefabricated assembled steel bone concrete supporting system of claim 1, which is characterized in that: the supporting member and web member constituting the supporting system are formed by steel bar lined reinforced concrete pipes wrapped outside, the two ends of the prefabricated tubular member formed by steel pipes, pipe piles and concrete between the steel pipes and the pipe piles are connected with the end head formed by section steel and end plate, and the end head is provided with a section steel head reinforced by an outer cantilever and a drill hole for bolt connection with the connecting piece.
4. The prefabricated assembled steel bone concrete supporting system of claim 1, which is characterized in that: another method of the middle connecting piece is provided, namely, a hollow steel plate with pile caps at four corners is connected to a supporting pile top of a steel frame upright post through bolts, the lower part of the hollow steel plate is connected with a connecting plate which is provided with holes and can freely move, a standardized supporting connecting bottom plate is covered on the hollow steel plate, the connecting plate, the hollow steel plate and the supporting connecting bottom plate are connected through bolts, and the three plates are connected through bolts to jointly form the middle connecting piece; the hollow steel plate can be conveniently moved in a larger range by the lower connecting plate and the upper supporting connecting bottom plate due to the existence of the hollow steel plate, so that the connection errors caused by various center offsets possibly existing in the steel frame upright post supporting pile can be adjusted; the support connecting bottom plate is connected with the upper prefabricated supporting member and the web member through bolt holes in a bolt mode, and the bottom plate after alignment and centering can be connected with the web member and the supporting member in all directions.
5. The prefabricated assembled steel bone concrete supporting system of claim 4, wherein: after the support member is connected with the web member, the orthogonal position of the support member and the web member is connected and reinforced through an upper triangular axillary plate and a lower triangular axillary plate and a pull rod, so that the overall stability of a support system is enhanced; force transmission section steel is additionally arranged between the supporting members to tightly push the supporting members and transmit the force of the supporting shaft.
6. The prefabricated assembled steel bone concrete supporting system of claim 1, which is characterized in that: aiming at the condition that the deviation is generated when the supporting pile is arranged, a middle connecting piece is provided, force transmission section steel in the axis direction of the prefabricated supporting component and the web member penetrates through the upright post steel member to be welded, and then the supporting component and the web member in all directions are connected through the bottom plate and the standardized triangular axillary plate by using bolts to form a supporting system.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000058238A (en) * | 1999-10-30 | 2000-10-05 | 홍원기 | Underground construction method using permanent reinforced concrete girders as temporary struts |
| CN201176594Y (en) * | 2008-03-04 | 2009-01-07 | 杨峰 | Reinforced concrete support ring beam for deep-foundation pit |
| CN203530990U (en) * | 2013-09-28 | 2014-04-09 | 福建工程学院 | Deep foundation pit shoring retaining wall steel pipe concrete supporting structure |
-
2016
- 2016-11-09 CN CN201611009338.9A patent/CN108060674B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000058238A (en) * | 1999-10-30 | 2000-10-05 | 홍원기 | Underground construction method using permanent reinforced concrete girders as temporary struts |
| CN201176594Y (en) * | 2008-03-04 | 2009-01-07 | 杨峰 | Reinforced concrete support ring beam for deep-foundation pit |
| CN203530990U (en) * | 2013-09-28 | 2014-04-09 | 福建工程学院 | Deep foundation pit shoring retaining wall steel pipe concrete supporting structure |
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Address after: 310000 16, B block, Rubo International Building, 673, Xihu District, Hangzhou, Zhejiang. Patentee after: Zhejiang NANLIAN Civil Engineering Technology Co.,Ltd. Patentee after: Yan Ping Address before: 310000 16, B block, Rubo International Building, 673, Xihu District, Hangzhou, Zhejiang. Patentee before: HANGZHOU NANLIAN CIVIL ENGINEERING TECHNOLOGY Co.,Ltd. Patentee before: Yan Ping |
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