CN114108672B - Tower crane foundation and bottom plate superposed integrated structure and construction method thereof - Google Patents

Tower crane foundation and bottom plate superposed integrated structure and construction method thereof Download PDF

Info

Publication number
CN114108672B
CN114108672B CN202111353425.7A CN202111353425A CN114108672B CN 114108672 B CN114108672 B CN 114108672B CN 202111353425 A CN202111353425 A CN 202111353425A CN 114108672 B CN114108672 B CN 114108672B
Authority
CN
China
Prior art keywords
foundation
section
bottom plate
tower crane
tower
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111353425.7A
Other languages
Chinese (zh)
Other versions
CN114108672A (en
Inventor
钱申春
邓光文
凌玉柱
周文
钱鹏
许健
李方根
汪利平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Road and Bridge Engineering Co Ltd
Original Assignee
Anhui Road and Bridge Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anhui Road and Bridge Engineering Co Ltd filed Critical Anhui Road and Bridge Engineering Co Ltd
Priority to CN202111353425.7A priority Critical patent/CN114108672B/en
Publication of CN114108672A publication Critical patent/CN114108672A/en
Application granted granted Critical
Publication of CN114108672B publication Critical patent/CN114108672B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/44Foundations for machines, engines or ordnance
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Foundations (AREA)

Abstract

The invention discloses a tower crane foundation and bottom plate superposed integrated structure and a construction method thereof, wherein the tower crane foundation comprises a tower crane foundation, a bottom plate, a water stop steel plate and a tower body reinforcing section, the tower crane foundation comprises a leveling layer, a waterproof layer, a lower sleeve, a foundation connecting section, a foundation concave section, four bottom tower section expansion sections and four bottom expansion uplift piles, the bottom tower section expansion sections are arranged in the foundation concave section, the bottom expansion uplift piles are positioned below the foundation connecting section and outside the foundation concave section, the water stop steel plate is arranged at the junction of the foundation connecting section and the bottom plate, the top surface of the foundation connecting section is flush with the top of the bottom plate, the top surface of the lower sleeve embedded in the bottom expansion uplift pile is flush with the top of the bottom plate, the tower body reinforcing section consists of an upper sleeve, a side wing truss and connecting angle steel, the side wing truss and the upper sleeve are sequentially arranged at the diagonal extension of the tower body from inside to outside, and finally, foundation steel bars are arranged, concrete is poured, and the construction of the tower crane foundation and the bottom superposed integrated structure is completed.

Description

Tower crane foundation and bottom plate superposed integrated structure and construction method thereof
Technical Field
The invention relates to the technical field of building foundation engineering, in particular to a tower crane foundation and bottom plate superposed integrated structure and a construction method thereof.
Background
For the superstructure of high-rise buildings or multi-storey buildings, a tower crane is generally required, and the foundation of the tower crane can be made into pile foundations and concrete block foundations and can also be arranged on a basement bottom plate. With the continuous development of the building industry in China, the tower crane becomes one of the indispensable operation machines in modern building construction. Most of tower crane foundation bearing platforms in the construction of the building engineering at the present stage adopt independent forms, and for the foundation of the bottom plate of the high-rise building, the tower crane foundation bearing platforms are positioned below the bottom plate, so that the earthwork of the foundation part of the tower crane is over-excavated, and a certain amount of reinforced concrete waste is caused. In the traditional construction method, the tower crane foundation and the bottom plate are constructed separately, the tower crane foundation is constructed firstly, then the bottom plate is constructed, the tower crane foundation and the bottom plate have height difference, and the later-stage tower crane is difficult to dismantle and has large engineering quantity.
Therefore, it is needed to find a tower crane foundation and bottom plate superposition integrated structure which is reasonable in structure, has anti-pulling, anti-translation and anti-bending capabilities, is good in overall stability, and is convenient to construct, and a construction method is very important.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a tower crane foundation and bottom plate superposed integrated structure and a construction method thereof.
The invention is realized by the following technical scheme:
the utility model provides a tower crane foundation and bottom plate coincide integrated structure, including tower crane foundation, bottom plate and body of tower reinforcing section, the tower crane foundation including screed-coat, waterproof layer, lower sleeve pipe, foundation linking section, foundation indent section, four sections bottom tower section expansion sections and four foundation expand the anti-pulling pile, the bottom tower section expansion section sets up in foundation indent section, the bottom expands the anti-pulling pile and is located foundation linking section below and foundation indent section's the outside the juncture of foundation linking section and bottom plate is provided with the stagnant water steel sheet the top surface of foundation linking section flushes with the top of bottom plate the bottom expand the anti-pulling pile in imbeds down the sleeve pipe, down the top surface of sleeve pipe flushes with the top of bottom plate, body of tower reinforcing section is including last sleeve pipe, flank truss and angle steel, flank truss and last sleeve pipe set gradually in body of tower diagonal extension department from interior to exterior.
The foundation connection section and the foundation concave section are provided with foundation reinforcing steel bars, the foundation reinforcing steel bars are in lap joint and binding with the reinforcing steel bars of the bottom plate, and concrete is poured into the foundation connection section and the foundation concave section to form a whole.
The side wing truss is a right trapezoid formed by assembling a plurality of rod pieces, the middle of each corner and the middle of each long side are provided with horizontal extension parts, and the end parts of each horizontal extension part are provided with butt joint lug plates.
The lower end of the upper sleeve is in threaded connection with the upper end of the lower sleeve, leveling wings are arranged at the junction of the lower sleeve and the leveling layer, a plurality of first connecting lug plates are arranged at the upper and lower parts of the upper sleeve, connecting rods are bolted between adjacent upper sleeves through the first connecting lug plates, and the distance between the first connecting lug plates is matched with the butt joint lug plates of the side wing truss.
The angle steel is composed of a vertical wing plate and a connecting lug plate, a plurality of connecting lug plates II with bolt holes are arranged at right angles of the vertical wing plate, and the distance between the connecting lug plates II is matched with the butt joint lug plates of the flank trusses.
A construction method of a tower crane foundation and bottom plate superposed integrated structure specifically comprises the following steps:
1) Determining the foundation position of the tower crane by measuring and paying off at the bottom of a foundation pit, constructing four bottom expansion uplift piles at corresponding positions, welding upper reinforcing steel bars of the bottom expansion uplift piles with a lower sleeve, pouring concrete into a whole, and then performing earth excavation to form a foundation concave section;
2) Tamping and leveling the foundation pit and the concave section of the foundation of the whole bottom plate, pouring a cushion layer, and then constructing a waterproof layer and a leveling layer in sequence as a whole;
3) Placing a concrete cushion block on a leveling layer at the bottom of the foundation concave section, welding and installing connecting angle steel at the corresponding position of the diagonal line of the tower body, welding and installing a bottom tower section expansion section at the bottom diagonal line, and then hanging the bottom tower section on the concrete cushion block;
4) The leveling wings are bolted on the hoops at the junction of the lower sleeve and the leveling layer, and the upper sleeve is mounted on the top of the lower sleeve after the verticality of the lower sleeve is adjusted;
5) The opposite angles of the tower body are simultaneously provided with side wing trusses, the short sides of the side wing trusses are bolted to the corresponding first connecting lug plates of the upper sleeve through butt joint lug plates, the long sides of the side wing trusses are bolted to the corresponding second connecting lug plates of the connecting angle steel through butt joint lug plates, and then the connecting rods are bolted and installed between the adjacent upper sleeve and are divided into an upper sleeve and a lower sleeve to form an integral supporting and retaining stable system;
6) Binding foundation reinforcing steel bars of a foundation connection section and a foundation concave section according to a bottom plate reinforcement when the tower crane foundation is constructed and poured, reserving a lap joint length, pouring concrete, and pre-burying a water stop steel plate at the contact part of the tower crane foundation connection section and the bottom plate;
7) Binding the bottom plate steel bars and overlapping with the foundation steel bars reserved for the tower crane foundation, and then pouring concrete to complete the construction of the tower crane foundation and bottom plate superposed integrated structure.
The invention has the advantages that:
1. compared with the prior art, the invention integrally constructs the tower crane foundation and the bottom plate, has good overall structural stability, improves the anti-pulling and waterproof performances of the tower crane foundation, reduces the consumption of steel bars and concrete, saves the construction cost and is convenient for the later-stage tower crane to be dismantled.
2. The tower body reinforcing section provided by the invention enhances the translation resistance and the bending resistance of the tower crane foundation, improves the safety of tower crane operation, and simultaneously has the advantages that the upper sleeve and the flank truss in the tower body reinforcing section are mounted by bolting, so that the disassembly and the assembly are convenient, the recycling is convenient, and the cost is saved.
3. The leveling wing adopted in the invention has the advantages of simple manufacture and convenient installation, and can effectively control the verticality of the sleeve and prevent the inclination of the tower body.
Drawings
FIG. 1 is a construction flow diagram of a tower crane foundation and base plate superposed integrated structure;
FIG. 2 is a plan view of a tower foundation and bedplate composite structure;
FIG. 3 is a cross-sectional view of A-A of FIG. 2;
FIG. 4 is a top view of a connecting angle;
FIG. 5 is a left side view of FIG. 4;
fig. 6 is a schematic structural view of the side wing truss.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings, such as fig. 1 to 6.
As shown in fig. 2 and 3, the integrated structure of tower crane foundation and bottom plate superposition comprises a tower crane foundation, a bottom plate 1, a water stop steel plate 2 and a tower body reinforcing section, wherein the tower crane foundation is composed of a leveling layer 10, a waterproof layer 9, a lower sleeve 11, a foundation connecting section 8, a foundation concave section 15, four bottom tower section expansion sections 13 and four bottom expansion uplift piles 12, the bottom tower section expansion sections 13 are arranged in the foundation concave section 15, the bottom expansion uplift piles 12 are positioned below the foundation connecting section 8 and outside the foundation concave section 15, the water stop steel plate 2 is arranged at the juncture of the foundation connecting section 8 and the bottom plate 1, the top surface of the foundation connecting section 8 is flush with the top of the bottom plate 1, the top surface of the lower sleeve 11 embedded in the bottom expansion uplift piles 12 is flush with the top of the bottom plate 1, and the tower body reinforcing section is composed of an upper sleeve 7, a side wing truss 6 and a connecting angle steel 5, the side wing truss 6 and the upper sleeve 7 are sequentially arranged at the diagonal of the tower body 4 from inside to outside.
The foundation connection section 8 and the foundation concave section 15 are provided with foundation reinforcing steel bars 16 and are in lap joint binding with the reinforcing steel bars of the bottom plate 1, and concrete is poured into the foundation connection section and the foundation concave section to form a whole.
As shown in fig. 6, the side truss 6 is assembled into a right trapezoid by a plurality of rods 23, and each corner and the middle of the long side extend horizontally and are provided with a butt lug plate 22.
The upper sleeve 7 and the lower sleeve 11 are in threaded connection, leveling wings 3 are arranged at the junction of the lower sleeve 11 and the leveling layer 10, a plurality of first connecting lug plates 19 are arranged at the upper and lower parts of the upper sleeve 7, connecting rods 17 are arranged between adjacent upper sleeves 7 in a bolting way through the first connecting lug plates 19, and the distance between the first connecting lug plates 19 is matched with the butt joint lug plates 22 of the side wing truss 6.
As shown in fig. 4 and 5, the connecting angle steel 5 is composed of a vertical wing plate 20 and a second connecting lug plate 18, a plurality of second connecting lug plates 18 with bolt holes 21 are arranged at right angles of the vertical wing plate 20, and the distance between the second connecting lug plates 18 is matched with the butt joint lug plates 22 of the flank truss 6.
As shown in fig. 1, a construction method of a tower crane foundation and bottom plate superposed integrated structure comprises the following steps:
1) Determining the foundation position of the tower crane by measuring and paying off at the bottom of a foundation pit, constructing four bottom expansion uplift piles 12 at corresponding positions, welding upper steel bars of the bottom expansion uplift piles 12 with a lower sleeve 11, pouring concrete into a whole, and then performing earth excavation to form a foundation concave section 15;
2) Tamping and leveling the whole foundation pit of the bottom plate and the concave section 15 of the foundation, pouring a cushion layer, and then constructing a waterproof layer 9 and a leveling layer 10 in sequence as a whole;
3) Placing a concrete cushion block 14 on the leveling layer 10 at the bottom of the foundation concave section 15, welding and installing a connecting angle steel 5 at the corresponding position of the diagonal line of the tower section tower body 4, welding and installing a bottom tower section expansion section 13 at the bottom diagonal line, and then hanging the bottom tower section on the concrete cushion block 14;
4) The leveling wings 3 are bolted to the hoops at the junction of the lower casing 11 and the leveling layer 10, and the upper casing 7 is mounted on the top of the lower casing 11 after the verticality of the lower casing 11 is adjusted
5) The opposite angles of the tower body 4 are simultaneously provided with the flank trusses 6, the short sides of the flank trusses 6 are bolted to the corresponding first connecting lug plates 19 of the upper sleeves 7 through the butt joint lug plates 22, the long sides of the flank trusses 6 are bolted to the corresponding second connecting lug plates 18 of the connecting angle steels 5 through the butt joint lug plates 22, and then the connecting rod 17 is bolted and installed between the adjacent upper sleeves 7 and divided into an upper passage and a lower passage, so that an integral supporting and retaining stable system is formed;
6) When the tower crane foundation is constructed and poured, the foundation connection section 8 and the foundation reinforcing steel bar 16 of the foundation concave section 15 are bound according to the reinforcing steel bar of the bottom plate 1, an overlap joint length is reserved, then concrete is poured, and a water stop steel plate 2 is pre-buried at the contact part of the tower crane foundation connection section 8 and the bottom plate 1;
7) Binding the steel bars of the bottom plate 1, overlapping with the reserved foundation steel bars 16 of the tower crane foundation, and pouring concrete to complete the construction of the integrated structure of the tower crane foundation and the bottom plate.

Claims (1)

1. A construction method of a tower crane foundation and bottom plate superposed integrated structure is characterized by comprising the following steps of: the tower crane foundation and the bottom plate superposed integrated structure comprises a tower crane foundation, a bottom plate and a tower body reinforcing section, wherein the tower crane foundation comprises a leveling layer, a waterproof layer, a lower sleeve, a foundation connecting section, a foundation concave section, four bottom tower section expansion sections and four bottom expansion uplift piles, the bottom tower section expansion sections are arranged in the foundation concave section, the bottom expansion uplift piles are positioned below the foundation connecting section and outside the foundation concave section, water stop steel plates are arranged at the juncture of the foundation connecting section and the bottom plate, the top surface of the foundation connecting section is flush with the top of the bottom plate, the lower sleeve is embedded in the bottom expansion uplift piles, the top surface of the lower sleeve is flush with the top of the bottom plate, and the tower body reinforcing section comprises an upper sleeve, a flank truss and connecting angle steel, wherein the connecting angle steel, the flank truss and the upper sleeve are sequentially arranged at the diagonal extension of the tower body from inside to outside;
the foundation connection section and the foundation concave section are provided with foundation steel bars, the foundation steel bars are in lap joint and binding with the steel bars of the bottom plate, and concrete is poured into the foundation connection section and the foundation concave section to form a whole;
the side wing truss is a right trapezoid formed by assembling a plurality of rod pieces, the middle of each corner and the middle of each long side are provided with horizontal extension parts, and the end part of each horizontal extension part is provided with a butt joint lug plate;
the lower end of the upper sleeve is in threaded connection with the upper end of the lower sleeve, leveling wings are arranged at the junction of the lower sleeve and the leveling layer, a plurality of first connecting lug plates are arranged at the upper and lower parts of the upper sleeve, connecting rods are bolted between adjacent upper sleeves through the first connecting lug plates, and the distance between the first connecting lug plates is matched with the butt joint lug plates of the side wing trusses;
the connecting angle steel consists of a vertical wing plate and a connecting lug plate, a plurality of connecting lug plates II with bolt holes are arranged at right angles of the vertical wing plate, and the distance between the connecting lug plates II is matched with the butt joint lug plates of the flank trusses;
the construction method of the tower crane foundation and bottom plate superposed integrated structure specifically comprises the following steps:
1) Determining the foundation position of the tower crane by measuring and paying off at the bottom of a foundation pit, constructing four bottom expansion uplift piles at corresponding positions, welding upper reinforcing steel bars of the bottom expansion uplift piles with a lower sleeve, pouring concrete into a whole, and then performing earth excavation to form a foundation concave section;
2) Tamping and leveling the foundation pit and the concave section of the foundation of the whole bottom plate, pouring a cushion layer, and then constructing a waterproof layer and a leveling layer in sequence as a whole;
3) Placing a concrete cushion block on a leveling layer at the bottom of the foundation concave section, welding and installing connecting angle steel at the corresponding position of the diagonal line of the tower body, welding and installing a bottom tower section expansion section at the bottom diagonal line, and then hanging the bottom tower section on the concrete cushion block;
4) The leveling wings are bolted on the hoops at the junction of the lower sleeve and the leveling layer, and the upper sleeve is mounted on the top of the lower sleeve after the verticality of the lower sleeve is adjusted;
5) The opposite angles of the tower body are simultaneously provided with side wing trusses, the short sides of the side wing trusses are bolted to the corresponding first connecting lug plates of the upper sleeve through butt joint lug plates, the long sides of the side wing trusses are bolted to the corresponding second connecting lug plates of the connecting angle steel through butt joint lug plates, and then the connecting rods are bolted and installed between the adjacent upper sleeve and are divided into an upper sleeve and a lower sleeve to form an integral supporting and retaining stable system;
6) Binding foundation reinforcing steel bars of a foundation connection section and a foundation concave section according to a bottom plate reinforcement when the tower crane foundation is constructed and poured, reserving a lap joint length, pouring concrete, and pre-burying a water stop steel plate at the contact part of the tower crane foundation connection section and the bottom plate;
7) Binding the bottom plate steel bars and overlapping with the foundation steel bars reserved for the tower crane foundation, and then pouring concrete to complete the construction of the tower crane foundation and bottom plate superposed integrated structure.
CN202111353425.7A 2021-11-16 2021-11-16 Tower crane foundation and bottom plate superposed integrated structure and construction method thereof Active CN114108672B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111353425.7A CN114108672B (en) 2021-11-16 2021-11-16 Tower crane foundation and bottom plate superposed integrated structure and construction method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111353425.7A CN114108672B (en) 2021-11-16 2021-11-16 Tower crane foundation and bottom plate superposed integrated structure and construction method thereof

Publications (2)

Publication Number Publication Date
CN114108672A CN114108672A (en) 2022-03-01
CN114108672B true CN114108672B (en) 2023-07-21

Family

ID=80396662

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111353425.7A Active CN114108672B (en) 2021-11-16 2021-11-16 Tower crane foundation and bottom plate superposed integrated structure and construction method thereof

Country Status (1)

Country Link
CN (1) CN114108672B (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3530505B2 (en) * 2001-05-31 2004-05-24 東京電力株式会社 Steel tower
CN201599158U (en) * 2009-09-29 2010-10-06 中国水电顾问集团华东勘测设计研究院 Multi-stake steel framework maritime wind turbine infrastructure with central stake
CN202012088U (en) * 2011-03-30 2011-10-19 浙江金典建设有限公司 Foundation structure of tower crane
CN102966114B (en) * 2012-12-10 2016-04-13 中国建筑第八工程局有限公司 Tower crane foundation structure and construction method thereof
CN206599392U (en) * 2017-03-31 2017-10-31 青建集团股份公司 A kind of prestressing force tower crane attachment
CN208933989U (en) * 2018-06-29 2019-06-04 中建二局第三建筑工程有限公司 A kind of tower-crane foundation structure
CN211714006U (en) * 2019-12-27 2020-10-20 中铁二局集团有限公司 Basement water-resistant plate and tower crane one-step forming foundation structure
CN212503725U (en) * 2020-04-17 2021-02-09 徐恒强 Windproof fixing structure of tower crane for building

Also Published As

Publication number Publication date
CN114108672A (en) 2022-03-01

Similar Documents

Publication Publication Date Title
CN107060140B (en) Prefabricated double-steel-tube concrete shear wall and assembling method thereof
CN105649360A (en) Integral assembling type building system and installing method
CN112878535B (en) Precast concrete wallboard connecting structure and construction method thereof
CN112112263A (en) Fabricated concrete beam-column joint using precast concrete tubular pile and construction method
CN108775084B (en) Steel-concrete combined precast beam and precast column connecting structure and construction method
CN201567584U (en) Prefabricated construction reinforced concrete cushion cap foundation
CN107355008B (en) Prefabricated connection structure and method for newly added concrete filled steel tubular column and existing structure
KR102286225B1 (en) Method for constructing underground structure busing PC integrating method without support
CN102286982A (en) Deep foundation pit precast building enclosure for constructing in low environment
CN108729544B (en) Dry-and wet-type composite joint pin-connected panel construction
CN111305627B (en) Concrete tank room construction method
CN213741571U (en) Prefabricated column and beam column node for prefabricated concrete building structure reserved steel bar perforation
CN111764578B (en) Reverse construction pile column structure and construction method thereof
CN218757587U (en) Prefabricated assembled reinforced concrete retaining wall
CN112376705A (en) Beam column node with precast concrete pipe pile as upper column and construction method of beam column node
CN114108672B (en) Tower crane foundation and bottom plate superposed integrated structure and construction method thereof
CN207597914U (en) Add the construction stress structure for building multi-layer underground space under a kind of existing building group
CN115821974A (en) Prefabricated assembled reinforced concrete retaining wall and construction method thereof
CN217871021U (en) Prefabricated concrete beam column node of concrete prefabricated rectangular pipe pile
CN109137984A (en) Assembled integral mixes prefabricated pipe gallery
CN213203667U (en) Supporting structure for post-cast strip-striding temporary lane of top plate of ground depot
CN212534495U (en) Use assembled concrete beam column node of precast concrete tubular pile
CN114737608A (en) Superposed underground structure anti-seismic system based on self-resetting breaking columns and construction method
CN210086029U (en) Weather-resistant steel pipe concrete cover beam
CN208088873U (en) The construction stress structure of multi-storey basement is extended under a kind of protection groups of building

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant