CN112502187A - Method for reinforcing and supporting concrete-filled steel tube column by reverse construction method - Google Patents
Method for reinforcing and supporting concrete-filled steel tube column by reverse construction method Download PDFInfo
- Publication number
- CN112502187A CN112502187A CN202011423802.5A CN202011423802A CN112502187A CN 112502187 A CN112502187 A CN 112502187A CN 202011423802 A CN202011423802 A CN 202011423802A CN 112502187 A CN112502187 A CN 112502187A
- Authority
- CN
- China
- Prior art keywords
- column
- steel
- steel pipe
- concrete
- construction
- 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.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
Abstract
The invention discloses a reinforcing and supporting method for a concrete-filled steel tubular column by a reverse construction method, which comprises the following steps: manufacturing a steel truss according to the measured deviation information of the defective steel pipe concrete column; hoisting the steel truss to an installation position, and fixing supporting legs of the steel truss with the first floor plate surface; fixing the defective steel pipe concrete column to the steel truss connecting column; after the construction is carried out to the position of the bottom plate, permanent reinforcement measures are carried out on the defective steel pipe concrete column again; the steel truss is removed. When the bearing capacity of the steel pipe column is insufficient after the steel pipe column is poured, the bearing capacity of the steel pipe concrete column is reinforced by using a large-scale truss system, the problem of insufficient bearing capacity of the steel pipe concrete column is solved, construction is carried out under the condition that the construction of a top-down construction method is not influenced, the subsequent construction procedures of the top-down construction method are guaranteed, and the project progress is guaranteed; the deflection generated when the steel pipe concrete column is hoisted is small and is close to a statically indeterminate structure, and under the condition that the steel pipe concrete column has deviation, the structural stability, the safety and the reliability are ensured.
Description
Technical Field
The invention relates to the technical field of reverse construction method construction, in particular to a steel pipe concrete column reinforcing and supporting method of a reverse construction method.
Background
With the rapid development of urban rail transit, the reverse construction method has more and more extensive application due to the characteristics of safety, small influence on ground traffic, large structural rigidity and the like. However, the cover-and-dig reverse construction method needs to be provided with a permanent upright post pile and a steel pipe column, the steel pipe column is used as a basement structure column, when the buried depth is deep and the reverse construction method is adopted for construction, the steel pipe column is easy to cause deviation under the influence of positioning precision and the like, the deviation is not easy to be found during construction, and the time is too late when a problem is found during downward construction. If the deviation is too large and can not meet the specification and the design requirement, the deviated steel pipe column needs to be processed, so that a reinforcement measure for deviation after the steel pipe column is poured is urgently needed, and the problem of insufficient bearing capacity of the steel pipe concrete column is solved.
In summary, how to effectively solve the problem of insufficient bearing capacity after the steel pipe column is poured due to reasons such as insufficient pile-entering depth of the steel pipe column in the reverse construction method is a problem that needs to be solved urgently by those skilled in the art at present.
Disclosure of Invention
The invention aims to provide a steel tube concrete column reinforcing and supporting method for a top-down construction method, which is characterized in that a large truss supporting system is arranged under the condition that the construction of the top-down construction method is not influenced, so that the stability of a top-down construction method structure and the steel tube concrete column is ensured.
In order to solve the technical problems, the invention provides the following technical scheme:
a reinforcing and supporting method for a concrete-filled steel tubular column by a reverse construction method comprises the following steps:
manufacturing a steel truss according to the measured deviation information of the defective steel pipe concrete column;
hoisting the steel truss to an installation position, and fixing supporting legs of the steel truss with the first floor plate surface;
fixing the defective steel pipe concrete column to the steel truss connecting column;
after the construction is carried out to the position of the bottom plate, permanent reinforcement measures are carried out on the defective steel pipe concrete column again;
the steel truss is removed.
Preferably, in the process of constructing to the bottom plate position, the defective steel pipe concrete column is reinforced by the inclined strut during each layer of construction.
Preferably, during the reinforcement of the defective steel pipe concrete column by the diagonal brace during each layer of construction, the upper end of the diagonal brace is connected with the defective steel pipe concrete column, and the lower end of the diagonal brace is connected with the support pile or the qualified steel pipe concrete column.
Preferably, the upper end of the inclined strut is connected with the defective steel pipe concrete column, specifically, a lifting lug is welded on the defective steel pipe concrete column, and the upper end of the inclined strut is connected with the lifting lug through a bolt.
Preferably, the lower end of the inclined strut is connected with the support pile or the qualified steel pipe concrete column, and specifically, the lower end of the inclined strut is connected with an embedded part in the support pile or the qualified steel pipe concrete column in a welding mode.
Preferably, the steel truss is welded and connected through I-steel, the steel truss is provided with two groups of supporting legs and a group of connecting columns, the two supporting legs in each group are respectively located at four corners of the truss body, and the group of connecting columns are arranged in the middle of the two groups of supporting legs.
Preferably, hoist the steel truss to the mounted position to fix the supporting legs and the first floor face of steel truss, include:
embedding anchor bolts in the first floor;
a column base is arranged at the supporting leg of the steel truss, and a through hole is formed in the column base;
and sleeving the through hole of the column base on an anchor bolt and fastening by using a nut.
The invention provides a reinforcing and supporting method for a concrete-filled steel tubular column by a reverse construction method, which comprises the following steps: manufacturing a steel truss according to the measured deviation information of the defective steel pipe concrete column; hoisting the steel truss to an installation position, and fixing supporting legs of the steel truss with the first floor plate surface; fixing the defective steel pipe concrete column to the steel truss connecting column; after the construction is carried out to the position of the bottom plate, permanent reinforcement measures are carried out on the defective steel pipe concrete column again; the steel truss is removed.
By applying the technical scheme provided by the embodiment of the invention, when the bearing capacity of the steel pipe column is insufficient after the steel pipe column is poured due to reasons such as insufficient depth of the steel pipe column into the pile and the like, the bearing capacity of the steel pipe column is reinforced by using a large-scale truss system, the problem of insufficient bearing capacity of the steel pipe column is solved, construction is carried out under the condition that the construction of a reverse construction method is not influenced, the subsequent construction process of the reverse construction method is ensured, and the project progress is ensured; the deflection generated when the steel pipe concrete column is hoisted by the structure is small, the steel pipe concrete column is close to a statically indeterminate structure, and the stability, the safety and the reliability of the structure are ensured under the condition that the steel pipe concrete column deviates.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for reinforcing and supporting a concrete filled steel tubular column by a top-down method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a supporting manner of a first steel truss layer in a supporting method for reinforcing a steel core concrete column by a top-down method according to an embodiment of the present invention;
FIG. 3 is a schematic view of the column shoe of FIG. 2;
fig. 4 is a schematic view illustrating a supporting manner of an interlayer diagonal brace in a supporting method for reinforcing a steel pipe concrete column by a top-down method according to an embodiment of the present invention.
The drawings are numbered as follows:
the steel pipe concrete column comprises a defective steel pipe concrete column 1, a first floor face 2, a steel truss 3, an inclined strut 4, a support pile 5, a qualified steel pipe concrete column 6, a column base 7, a through hole 71 and a reinforcing rib 72.
Detailed Description
The core of the invention is to provide a reinforcing and supporting method for a steel tube concrete column by a top-down construction method, and the reinforcing and supporting method for the steel tube concrete column by the top-down construction method is provided with a large truss supporting system under the condition that the construction by the top-down construction method is not influenced, so that the stability of a structure by the top-down construction method and the steel tube concrete column is ensured.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, fig. 1 is a flowchart illustrating a method for supporting a reinforced concrete-filled steel tubular column by a top-down method according to an embodiment of the present invention; FIG. 2 is a schematic view of a supporting manner of a first steel truss layer in a supporting method for reinforcing a steel core concrete column by a top-down method according to an embodiment of the present invention; FIG. 3 is a schematic view of the column shoe of FIG. 2; fig. 4 is a schematic view illustrating a supporting manner of an interlayer diagonal brace in a supporting method for reinforcing a steel pipe concrete column by a top-down method according to an embodiment of the present invention.
In a specific embodiment, the method for reinforcing and supporting a steel pipe concrete column by a top-down method provided by the invention comprises the following steps:
s110, manufacturing a steel truss 3 according to the measured deviation information of the defective steel pipe concrete column 1;
in practical application, after the concrete filled steel tubular column is installed, a detection device, such as a total station, is used for detecting the condition of the concrete filled steel tubular column, whether the concrete filled steel tubular column meets the requirement of the depth of burial, and when the concrete filled steel tubular column has deviation due to the fact that the depth of the concrete filled steel tubular column is not enough to influence the positioning precision, the steel tubular column with the deviation needs to be processed.
And checking the bearing capacity of the concrete-filled steel tube column according to the detected deviation condition, and designing the size of the steel truss 3 according to the bearing capacity requirement to manufacture the steel truss 3 so as to ensure the subsequent construction process of the reverse construction method.
S120, hoisting the steel truss 3 to an installation position, and fixing supporting legs of the steel truss 3 with the first floor plate surface 2;
in practical application, the manufactured steel truss 3 is hoisted to an installation position, and the steel truss 3 is fixed. The steel truss 3 is provided with supporting legs, the supporting legs of the steel truss 3 are fixedly connected with the first floor board surface 2, and the firmness and the stability of connection of the steel truss 3 and the first floor board surface 2 are guaranteed.
S130, fixing the defective steel pipe concrete column 1 to a steel truss 3 connecting column;
in practical application, the top surface of the defective steel pipe concrete column 1 is fixed to the bottom surface of the connecting column of the steel truss 3, and the defective steel pipe concrete column can be connected through welding or bolts. When the defective steel pipe concrete column 1 is stressed, the bearing force of the defective steel pipe concrete column 1 is diffused to the steel truss 3, and the requirement of the bearing force of the plate surface is met in the stress area of the steel pipe concrete column.
S140, after the construction is carried out to the position of the bottom plate, permanent reinforcement measures are carried out on the defective steel pipe concrete column 1 again;
and S150, removing the steel truss 3.
In practical application, after the steel truss 3 and the defective steel pipe concrete column 1 are fixed, after the construction is carried out to the pile foundation position, a permanent reinforcement measure is carried out, the steel truss 3 is removed after the strength meets the requirement, the original construction process is ensured, and the guarantee is provided for the engineering progress.
By applying the technical scheme provided by the embodiment of the invention, when the bearing capacity of the steel pipe column is insufficient after the steel pipe column is poured due to reasons such as insufficient depth of the steel pipe column into the pile and the like, the bearing capacity of the steel pipe column is reinforced by using a large-scale truss system, the problem of insufficient bearing capacity of the steel pipe column is solved, construction is carried out under the condition that the construction of a reverse construction method is not influenced, the subsequent construction process of the reverse construction method is ensured, and the project progress is ensured; the deflection generated when the steel pipe concrete column is hoisted by the structure is small, the steel pipe concrete column is close to a statically indeterminate structure, and the stability, the safety and the reliability of the structure are ensured under the condition that the steel pipe concrete column deviates.
On the basis of the above specific embodiment, in the process of constructing to the bottom plate position, the defective steel pipe concrete column 1 is reinforced by the inclined strut 4 during each layer of construction.
In practical application, the number of the inclined struts 4 is not limited, and can be one, two or more, so that the bearing capacity of each layer at the position is ensured. Preferably, the inclined strut 4 is a steel round pipe, and has a simple structure and high strength.
The first-layer steel truss 3 is combined with the interlayer inclined strut 4 to form a system, so that the overall bearing capacity of the defective steel pipe concrete column 1 is enhanced. Through force calculation, the deflection generated when the structure is used for hoisting a 350T steel pipe concrete column is only about 10mm and is close to a statically indeterminate structure, and the stability and the reliability of the structure are ensured.
On the basis of the above specific embodiment, during the reinforcement of the defective steel pipe concrete column 1 by the inclined strut 4 during each layer of construction, the upper end of the inclined strut 4 is connected with the defective steel pipe concrete column 1, the lower end of the inclined strut 4 is connected with the support pile 5 or the qualified steel pipe concrete column 6, the inclined strut 4 supports the defective steel pipe concrete column 1, the supporting force of the sunk steel pipe concrete column is diffused to the support pile 5 or the qualified steel pipe concrete column 6, and the supporting force of the sunk steel pipe concrete column is reinforced.
On the basis of the above specific embodiment, the upper end of the inclined strut 4 is connected with the defective steel pipe concrete column 1, and specifically, the lifting lugs are welded on the defective steel pipe concrete column 1, the upper end of the inclined strut 4 is connected with the lifting lugs through bolts, so that the connection is firm, when the inclined strut 4 needs to be detached, only the bolts connecting the lifting lugs and the inclined strut 4 need to be detached, and the operation is convenient.
On the basis of the specific embodiment, the lower end of the inclined strut 4 is connected with the support pile 5 or the qualified concrete-filled steel tubular column 6, specifically, the lower end of the inclined strut 4 is inserted into a connecting hole of an embedded part in the support pile 5 and is connected with the connecting hole by welding, so that the positioning is realized, and the connection is firm.
The lower end of the inclined strut 4 and the qualified steel pipe concrete column 6 can be connected in a welding mode, and can also be connected through a lifting lug, so that the connection is convenient.
On the basis of the specific embodiment, the steel truss 3 is connected through the I-steel in a welding mode, the structure is firm and reliable, and the bearing force is large. The steel truss 3 is provided with two groups of supporting legs and a group of connecting columns, and the two supporting legs in each group are respectively positioned at four corners of the truss body, so that the steel truss is simple in structure and easy to connect. A set of spliced pole sets up in two sets of supporting legss intermediate positions, and the steel truss 3 bears the bearing capacity of defect steel core concrete column 1 comparatively even, guarantees holistic stability.
On the basis of the above-mentioned specific embodiment, hoist steel truss 3 to the mounted position to fix steel truss 3's supporting legs and first floor face 2, include:
pre-burying anchor bolts on the first floor plate surface 2;
a column base 7 is arranged at the supporting foot of the steel truss 3, and a through hole 71 is formed in the column base 7;
the through hole 71 of the column base 7 is sleeved on the anchor bolt and fastened by a nut.
For convenience of description, the above three steps are combined for illustration.
When the first floor slab surface 2 is poured, anchor bolts are embedded in concrete.
When the steel truss 3 is manufactured, the supporting legs of the steel truss 3 are provided with column bases 7, through holes 71 are formed in the column bases 7, and the positions, the number and the sizes of the through holes 71 correspond to those of anchor bolts. When the steel truss 3 is hoisted, the through hole 71 of the column base 7 is aligned with the anchor bolt, the through hole 71 is sleeved on the anchor bolt and is fastened by the nut, so that the column base 7 is connected with the anchor bolt, the steel truss 3 and the first floor plate surface 2 are fixed and detachably connected, and the steel truss is convenient to detach. It should be noted that a reinforcing rib 72 may be provided at the joint between the column base 7 and the supporting foot to reinforce the joint strength between the column base 7 and the supporting foot.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The concrete filled steel tubular column reinforcing and supporting method of the reverse construction method provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A reinforcing and supporting method for a concrete-filled steel tubular column by a reverse construction method is characterized by comprising the following steps:
manufacturing a steel truss according to the measured deviation information of the defective steel pipe concrete column;
hoisting the steel truss to an installation position, and fixing supporting legs of the steel truss with the first floor plate surface;
fixing the defective steel pipe concrete column to the steel truss connecting column;
after the construction is carried out to the position of the bottom plate, permanent reinforcement measures are carried out on the defective steel pipe concrete column again;
the steel truss is removed.
2. The column reinforced support method of claim 1, wherein the column of defective steel tubular concrete is reinforced by diagonal bracing at each floor construction during the construction to the floor position.
3. The reverse construction method concrete-filled steel tube column reinforcing and supporting method according to claim 2, wherein during reinforcing of a defective concrete-filled steel tube column by the diagonal brace during each layer of construction, the upper end of the diagonal brace is connected with the defective concrete-filled steel tube column, and the lower end of the diagonal brace is connected with the support pile or the qualified concrete-filled steel tube column.
4. The reverse-construction concrete-filled steel tube column reinforcing and supporting method according to claim 3, wherein the upper end of the inclined strut is connected with the defective concrete-filled steel tube column, specifically, a lifting lug is welded on the defective concrete-filled steel tube column, and the upper end of the inclined strut is connected with the lifting lug through a bolt.
5. The reverse-construction concrete-filled steel tube column reinforcing and supporting method according to claim 3, wherein the lower end of the inclined strut is connected with a supporting pile or a qualified concrete-filled steel tube column, specifically, the lower end of the inclined strut is connected with an embedded part in the supporting pile or the qualified concrete-filled steel tube column in a welding manner.
6. The column reinforced support method of claim 1, wherein the steel truss is welded by i-beams, the steel truss has two sets of support legs and a set of connecting columns, each set of two support legs are located at four corners of the truss body, and the set of connecting columns is located at the middle position of the two sets of support legs.
7. The reverse construction concrete filled steel tubular column reinforcing and supporting method according to any one of claims 1 to 6, wherein the hoisting the steel truss to the installation position and fixing the supporting feet of the steel truss with the first floor comprises the following steps:
embedding anchor bolts in the first floor;
a column base is arranged at the supporting leg of the steel truss, and a through hole is formed in the column base;
and sleeving the through hole of the column base on an anchor bolt and fastening by using a nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423802.5A CN112502187A (en) | 2020-12-08 | 2020-12-08 | Method for reinforcing and supporting concrete-filled steel tube column by reverse construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423802.5A CN112502187A (en) | 2020-12-08 | 2020-12-08 | Method for reinforcing and supporting concrete-filled steel tube column by reverse construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112502187A true CN112502187A (en) | 2021-03-16 |
Family
ID=74970314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011423802.5A Pending CN112502187A (en) | 2020-12-08 | 2020-12-08 | Method for reinforcing and supporting concrete-filled steel tube column by reverse construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112502187A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127344A (en) * | 2009-12-18 | 2011-06-30 | Sumitomo Mitsui Construction Co Ltd | Joint structure of column and pile |
| CN104404861A (en) * | 2014-11-05 | 2015-03-11 | 中交第二航务工程局有限公司 | Steel trestle provided with steel anchor pile and construction method of steel trestle |
-
2020
- 2020-12-08 CN CN202011423802.5A patent/CN112502187A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011127344A (en) * | 2009-12-18 | 2011-06-30 | Sumitomo Mitsui Construction Co Ltd | Joint structure of column and pile |
| CN104404861A (en) * | 2014-11-05 | 2015-03-11 | 中交第二航务工程局有限公司 | Steel trestle provided with steel anchor pile and construction method of steel trestle |
Non-Patent Citations (1)
| Title |
|---|
| 刘清阳等: "逆作法立柱（桩）施工的几个问题"", 《建筑施工》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108035554B (en) | Construction method of section steel column support frame of super high-rise building frame column | |
| CN205857032U (en) | The toughened internal stress Construction Support device that a kind of floor stand combines with shelf bracket | |
| CN110219236B (en) | Prefabricated spliced pier column structure connected through slots and construction method thereof | |
| CN110130670B (en) | Reinforced concrete upper and lower bracket type temporary support system and construction method thereof | |
| CN105821769A (en) | Large-angle inclined leg pier pouring construction method | |
| CN103866784A (en) | Adjustable tower crane steel platform foundation | |
| CN209799167U (en) | Pre-buried column base reinforcing system | |
| CN112502187A (en) | Method for reinforcing and supporting concrete-filled steel tube column by reverse construction method | |
| CN216892017U (en) | Tie beam integral casting template in template connecting piece and lower stand | |
| CN103161262A (en) | Construction method of steel pipe column and used column feet structure | |
| CN115928682A (en) | Modular drilling platform and construction method | |
| CN215483097U (en) | Integrally-assembled pillarless underground structure | |
| CN111622091B (en) | Stress test method for prefabricated bridge pier | |
| CN107558607B (en) | Tower crane system arranged on existing concrete structure and construction method thereof | |
| CN209906223U (en) | Beam gantry crane | |
| CN105908755A (en) | Deep foundation pit supporting structure adopting steel pipe temporary strut | |
| CN207144179U (en) | The connecting node of spacer bar concrete column on a kind of girder steel | |
| CN112049253A (en) | Truss body and concrete structure connecting node, truss and method | |
| CN114658031B (en) | Basement roof returning supporting structure of overweight steel structure truss and construction method | |
| CN206538684U (en) | A kind of steel platform for bifurcated section Bridge Erector construction | |
| CN205776252U (en) | A kind of deep foundation pit supporting structure using steel pipe prop | |
| CN217128046U (en) | Asymmetric pier supporting platform system device | |
| CN219730220U (en) | Regularized adjustable construction elevator back-jacking device | |
| CN215925635U (en) | Monitoring warning is unsettled bracket of prestressing force for bridge | |
| CN220100211U (en) | Reinforced concrete column changes steel core concrete column node |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210316 |
|
| RJ01 | Rejection of invention patent application after publication |