CN110607765A - Intelligent bridge hanging basket prepressing device and control method thereof - Google Patents
Intelligent bridge hanging basket prepressing device and control method thereof Download PDFInfo
- Publication number
- CN110607765A CN110607765A CN201910535358.7A CN201910535358A CN110607765A CN 110607765 A CN110607765 A CN 110607765A CN 201910535358 A CN201910535358 A CN 201910535358A CN 110607765 A CN110607765 A CN 110607765A
- Authority
- CN
- China
- Prior art keywords
- steel
- hanging basket
- prepressing
- double
- module
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
- E01D21/105—Balanced cantilevered erection
Abstract
The invention discloses an intelligent bridge hanging basket prepressing device and a control method thereof, wherein the system comprises a pressing frame module, a ground anchor module, an intelligent loading module and a monitoring module, the pressing frame module uniformly transmits prepressing load to each component of a hanging basket according to the section form of a box girder, the ground anchor module provides a force application point for the application of the prepressing load, the intelligent loading module accurately applies the hanging basket prepressing load to the hanging basket in a grading manner through the pressing frame module, and the monitoring module automatically and accurately records load displacement data and draws a curve according to each component parameter of the prepressing system. The method is mainly applied to bridge hanging basket method construction, provides a system with simple structure, high automation and intelligent degree for hanging basket prepressing, and has wide application prospect in the hanging basket prepressing construction field.
Description
Technical Field
The invention belongs to the technical field of bridge construction, particularly relates to a hanging basket prepressing technology for bridge construction, and particularly relates to an intelligent bridge hanging basket prepressing device and a control method thereof.
Background
With the continuous promotion of the national infrastructure construction, the road and railway mileage is rapidly increased, and the development of social economy is practically guaranteed. The prestressed concrete continuous beam bridge and the continuous rigid frame bridge have the characteristics of excellent structural stress, wide application range, mature construction process, low construction and maintenance cost and the like, become a preferred bridge type for crossing mountains and valleys and existing lines on roads and railways, and are widely applied.
The construction of the prestressed concrete continuous beam and the main beam at the upper part of the continuous rigid frame bridge usually adopts a balanced cantilever pouring construction method, and the main equipment of the construction method is a hanging basket. Bridge superstructure safety and linear satisfying the designing requirement when pouring the construction for guaranteeing the girder cantilever need carry out the pre-compaction inspection to hanging basket overall stability and hanging basket actual bearing capacity, and its purpose is as follows: (1) confirming the correctness and the effectiveness of the installation of the hanging basket; (2) whether each component of the cradle can meet the requirements of strength and rigidity is checked, and the overall stable work of the cradle is ensured; (3) eliminating the inelastic deformation of the cradle, and simultaneously obtaining the elastic deformation data of the cradle to provide an actual measurement basis for subsequent construction formwork erection and the like; (4) the safety of the steel pipe is actually evaluated through five-stage pre-pressing and four-stage unloading. Therefore, before the hanging basket is put into use, the hanging basket must be pre-pressed, the construction safety of the upper structure of the bridge is ensured, and the linear design requirement of the bridge is met.
At present, precast concrete blocks or filling sand bags are mostly adopted for hanging basket prepressing to serve as girder load simulation, concrete blocks or sand bags with the total weight reaching 1.2 times of the maximum section weight need to be prepared according to the maximum weight of a cast-in-place girder section, then hoisting equipment such as a crane and the like is utilized to hoist and move the hanging basket in a grading manner, and hanging basket prepressing inspection is achieved. However, the existing hanging basket prepressing means has a plurality of defects: huge manpower and material resources are needed for prefabricating the concrete blocks or filling the sandbags, no place is available after the pre-pressing of the hanging basket is finished, and the post-treatment cost is high; the hanging basket equipment operation platform is narrow, a concrete block or a sand bag is easy to collide with a hanging rod of the hanging basket in the hoisting process of a crane, and potential safety hazards exist; the continuous beam bridge or the continuous rigid frame bridge is of a box-shaped cross section, loads borne by all parts of the cradle are different in the construction process, when a cradle prepressing test is carried out by utilizing concrete blocks or sand bags, the concrete blocks or the sand bags are uniformly piled on a cradle bottom die, the difference between the prepressing load and the actual load is large, and the working mechanical property of the cradle cannot be truly reflected; the graded loading of the hanging basket depends on the statistics of the hoisting quantity of concrete blocks or sandbags, and if an error exists in a single weight, the load deformation data obtained by the hanging basket is not accurate enough. Therefore, a prepressing system which is convenient to implement, can truly simulate the stress of the cradle and can accurately measure the load deformation curve of the cradle is urgently needed.
Disclosure of Invention
The invention discloses an intelligent bridge hanging basket prepressing device, which comprises a hanging basket, a prepressing device and a control system of the prepressing device, wherein the prepressing device and the control system of the prepressing device comprise a pressing frame module, a ground anchor module, an intelligent loading module and a monitoring module;
the pressing frame module comprises a steel strand, a square timber, I-shaped steel, a leveling wedge block, a double-spliced channel steel and a steel strand anchorage; the square timbers are arranged below the I-shaped steel at equal intervals, the leveling wedge blocks are arranged above the I-shaped steel, double-spliced channel steel is arranged above the leveling wedge blocks, and the square timbers, the I-shaped steel, the leveling wedge blocks and the double-spliced channel steel are fixed on a steel strand through a steel strand anchorage; the pressing frame modules are installed on a top plate, a flange plate, a bottom plate and a bottom web plate of the hanging basket in groups.
The ground anchor module comprises a threaded uplift pile and double-spliced I-shaped steel; the top of the threaded uplift pile is welded with double-spliced I-shaped steel;
the intelligent loading module comprises a comprehensive control box, a hydraulic pipeline and a hydraulic oil jack; the other end of the steel strand anchored by the pressing frame module is connected to a hydraulic oil top, and the double-spliced I-shaped steel is used as a support for applying load by the hydraulic oil top. After each hydraulic oil jack is installed, the hydraulic oil jacks are connected into the comprehensive control box through hydraulic pipelines, and the comprehensive control box controls the hydraulic oil jacks through a hydraulic system; the monitoring module is integrated in the comprehensive control box.
The control method of the intelligent bridge cradle pre-pressing device comprises the following steps:
step 1: the method comprises the following steps of (1) mounting a pressing frame module on a hanging basket, wherein the pressing frame module is divided into four parts, namely a flange plate, a top plate, a bottom plate and a bottom web plate, arranging square timbers at equal intervals, mounting I-shaped steel, flattening the top of the I-shaped steel by using a leveling wedge block, placing double-spliced channel steel used as a steel strand anchorage device for supporting, penetrating and anchoring a steel strand into the steel strand anchorage device from the bottom, and connecting the other end of the steel strand to an intelligent loading;
step 2: the other end of the steel strand anchored by the pressing frame module is connected to a hydraulic oil jack, the hydraulic oil jack takes the double-spliced I-shaped steel as a support for applying load, after each hydraulic oil jack is installed, the hydraulic oil jack is connected to a comprehensive control box through a hydraulic pipeline, and the comprehensive control box controls the hydraulic oil jack through a hydraulic system;
and step 3: inputting prepressing loading parameters such as prepressing load size, load application duration and the like of the hanging basket prepressing design scheme into intelligent control software in the comprehensive control box;
and 4, step 4: before the pre-pressing of the hanging basket starts, parameters such as the elastic modulus, the section area, the boundary condition and the like of the steel strand and the double-spliced I-shaped steel need to be input by monitoring software;
and 5: recording the hydraulic oil top tension stroke data and the load prepressed by the hanging basket by monitoring software in a monitoring module, and calculating the load displacement of the hanging basket prepressing through a structural calculation formula so as to draw a load displacement curve;
the displacement calculation principle of the hanging basket is as follows: oil top stroke is delta-deltaSteel+ΔⅡ+ΔHanging rack
Wherein: deltaSteelThe elongation of the steel strand;
ΔⅡthe deformation of the anchored double-spliced I-shaped steel is measured;
Δhanging rackIs the hanging basket displacement.
According to a calculation formula of the elongation of the steel strand: deltaSteelAnd (3) obtaining the elongation of the steel strand because the values are known, wherein P is the load of the cradle prepressing, L is the calculated length of the steel strand, E is the elastic modulus of the steel strand, and A is the effective section area of the steel strand. The differential equation for the beam's deflection line is: EI ω (x) ═ jjjjk (| m (x) dx) dx + C1x+C2Wherein E is the elastic modulus of the double-spliced I-shaped steel in the ground anchor system, I is the section inertia moment of the double-spliced I-shaped steel, and omega (x) isThe deflection of the beam, M (x) is the bending moment value applied to the beam, and C1And C2Then it is constant and x is the distance from the point of concentrated force to the beam end. The delta can be solved according to the structural mechanics formula and the position of the load action pointⅡ。
Then the hanging basket displacement calculation formula is as follows:
according to the load value, the structural calculation diagram and the boundary conditions, the displacement of the cradle can be calculated, and the displacement value and the curve of the pre-pressed load of the cradle can be effectively given together with the pre-pressed load of the cradle.
The method can be widely applied to prepressing in the construction of the hanging baskets of bridges such as continuous beams or continuous rigid frames and the like, has high modularization degree, can accurately simulate the concrete pouring load of the box girder in a grading manner, and is easy to flexibly implement various hanging basket prepressing schemes. Meanwhile, the hydraulic oil jacks at all positions are controlled in a linkage mode through a computer program, data such as hydraulic oil jacking force and jacking stroke are acquired in real time, a load displacement relation curve in the hanging basket prepressing process is intelligently drawn, and the later-stage formwork erection height determination of box girder segment construction is facilitated while the inelastic deformation of the hanging basket is eliminated. The method overcomes the defects that the traditional cradle prepressing is complicated in prepressing means, prepressing load is difficult to simulate accurately, load and displacement records of the cradle in the prepressing process depend on manual measurement and processing, the construction efficiency of cradle prepressing is improved, and cradle intelligent prepressing is realized.
Drawings
FIG. 1: the bridge hanging basket prepressing device is applied to a mechanism front view of a bridge;
FIG. 2: the bridge hanging basket prepressing device is applied to a mechanism side view of a bridge;
FIG. 3: the structure front view of the bridge hanging basket prepressing device is disclosed;
FIG. 4: the invention discloses a structural side view of a bridge hanging basket prepressing device;
number 1 in the figure, continuous beam box girder; 2. hanging a basket; 3. a pre-pressing device and a control system thereof; 4. a screw thread uplift pile; 5. double-spliced I-shaped steel; 6. steel strand wires; 7. square wood; 8. i-shaped steel; 9. leveling a wedge block; 10. Double-spliced channel steel; 11. a steel strand anchorage; 12. a comprehensive control box; 13. a hydraulic line; 14. and (6) hydraulic oil jacking.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in simplified form and are not to precise scale, and are provided solely for the purpose of facilitating and distinctly claiming the invention.
As shown in fig. 1 and 2, after the cradle is installed and debugged on the beam body of the bridge, the intelligent pre-pressing system for the cradle of the bridge can be deployed, and comprises a pressing frame module, a ground anchor module, an intelligent loading module and a monitoring module.
Firstly, a pressing frame module is installed on a hanging basket and comprises steel strands 6, square timber 7, I-shaped steel 8, a leveling wedge block 9, double-spliced channel steel 10 and a steel strand anchorage device 11. According to the drawing of the box girder body, the box girder is divided into four parts, namely a flange plate, a top plate, a bottom plate and a bottom web plate. The square timber 7 is arranged at equal intervals according to the loads of all parts, the I-shaped steel 8 serving as a load distribution beam is installed, the uniform loading of pre-pressing load is guaranteed, then the top of the I-shaped steel is leveled by the leveling wedge block 9, the double-spliced channel steel 10 serving as a steel strand anchorage device 11 for supporting is placed, the steel strand 6 penetrates into the steel strand anchorage device 11 from the bottom and is anchored, and the other end of the steel strand is connected to the intelligent loading module.
And secondly, performing construction installation of the ground anchor module according to the installation position of the pressing frame module. The ground anchor module comprises screw thread anti-floating pile 4, double pin I-steel 5, and screw thread anti-floating pile 4 is pressed the enough degree of depth in ground by mechanical equipment according to pressure frame mounted position with hang basket pre-compaction design load, later at 4 tops welding double pin I-steel 5 of screw thread anti-floating pile as intelligent loading module loading crossbeam, and double pin I-steel 5 need select reasonable shaped steel size according to hanging basket pre-compaction design load, ensures to provide sufficient intensity and rigidity.
And moreover, an intelligent loading module is installed behind the installed ground anchor module, and the intelligent loading module comprises a comprehensive control box 12, a hydraulic pipeline 13 and a hydraulic oil top 14. The other end of the steel strand 6 anchored by the pressing frame module is connected to a hydraulic oil top 14, and the hydraulic oil top 14 uses the double-spliced I-shaped steel 5 as a support for applying load. After each hydraulic jack is installed, the hydraulic jack is connected to the integrated control box 12 through a hydraulic pipeline 13, and the integrated control box 12 controls the hydraulic jack 14 through a hydraulic system. Prepressing loading parameters of the hanging basket prepressing design scheme, such as prepressing load size, load applying duration and the like, are input into intelligent control software in the comprehensive control box 12, and intelligent automatic control of the whole hanging basket prepressing process is achieved.
Finally, the monitoring module is integrated in the integrated control box 12, is a set of monitoring software, and is installed in the computer together with the intelligent control software. The monitoring module can automatically process and form a cradle preloading displacement data table and a curve according to the stroke of the hydraulic oil top 14 and the applied load in the intelligent control software, and the table and the curve are used as important parameters of later construction. Before the pre-pressing of the hanging basket starts, parameters such as the elastic modulus and the section area of the steel strand 6 and the double-spliced I-shaped steel 5, the boundary condition of the double-spliced I-shaped steel 5 and the like need to be input into the monitoring software.
After the installation is finished and relevant parameters are set in the comprehensive control box 12, the cradle prepressing test can be automatically carried out, the safety and the stability of the cradle are checked, and the load displacement curve of the cradle prepressing is automatically drawn. After the prepressing test is completed, the system can be detached and used for other hanging basket prepressing tests, or all members are used for bridge construction, so that the material waste is avoided, and the construction cost is saved.
Claims (4)
1. The utility model provides an intelligence bridge hangs basket pre-compaction device, includes and hangs basket and pre-compaction device and control system thereof, its characterized in that: the prepressing device and the control system thereof comprise a pressing frame module, a ground anchor module, an intelligent loading module and a monitoring module;
the pressing frame module comprises steel strands (6), square timber (7), I-shaped steel (8), leveling wedge blocks (9), double-spliced channel steel (10) and steel strand anchors (11); the square timber (7) is arranged below the I-shaped steel (8), the leveling wedge block (9) is arranged above the I-shaped steel (8), a double-spliced channel steel (10) is arranged above the leveling wedge block (9), and the square timber (7), the I-shaped steel (8), the leveling wedge block (9) and the double-spliced channel steel (10) are fixed at one end of a steel strand (6) through a steel strand anchorage device (11);
the ground anchor module comprises a threaded uplift pile (4) and double-spliced I-shaped steel (5); the top of the threaded uplift pile (4) is welded with double-spliced I-shaped steel (5);
the intelligent loading module comprises a comprehensive control box (12), a hydraulic pipeline (13) and a hydraulic oil jack (14); the other end of the steel strand (6) anchored by the pressing frame module is connected to a hydraulic oil jack (14), and the hydraulic oil jack (14) is connected with a comprehensive control box (12) through a hydraulic pipeline (13);
the monitoring module is integrated in the integrated control box (12).
2. The intelligent bridge hanging basket prepressing device according to claim 1, characterized in that: the pressing frame modules are installed on a top plate, a flange plate, a bottom plate and a bottom web plate of the hanging basket in groups.
3. The intelligent bridge hanging basket prepressing device according to claim 2, characterized in that: the square timbers in the pressing frame module are arranged at equal intervals.
4. The control method of the intelligent bridge hanging basket pre-pressing device according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
step 1: the method comprises the following steps of (1) mounting a pressing frame module on a hanging basket, wherein the pressing frame module is divided into four parts, namely a flange plate, a top plate, a bottom plate and a bottom web plate, arranging square timbers (7) at equal intervals, then mounting I-shaped steels (8), leveling the tops of the I-shaped steels by using leveling wedge blocks (9), placing double-spliced channel steels (10) serving as supports of steel strand anchors (11), penetrating steel strands (6) from the bottoms of the I-shaped steels and anchoring the steel strand anchors (11), and connecting the other ends of the steel strands to an intelligent loading;
step 2: the other end of the steel strand (6) anchored by the pressing frame module is connected to a hydraulic oil jack (14), the double-spliced I-shaped steel (5) is used as a support for applying load by the hydraulic oil jack (14), after each hydraulic oil jack is installed, the hydraulic oil jack is connected to a comprehensive control box (12) through a hydraulic pipeline (13), and the hydraulic oil jack (14) is controlled by the comprehensive control box (12) through a hydraulic system;
and step 3: prepressing loading parameters of the hanging basket prepressing design scheme are input into intelligent control software in the comprehensive control box (12);
and 4, step 4: before the pre-pressing of the hanging basket is started, the monitoring software needs to input parameters such as the elastic modulus and the section area of the steel strand (6) and the double-spliced I-shaped steel (5) and the boundary conditions of the double-spliced I-shaped steel (5);
and 5: recording the hydraulic oil top tension stroke data and the load prepressed by the hanging basket by monitoring software in a monitoring module, and calculating the load displacement of the hanging basket prepressing through a structural calculation formula so as to draw a load displacement curve;
the displacement calculation principle of the hanging basket is as follows: the top stroke of the hydraulic oil is
Δ＝ΔSteel+ΔⅡ+ΔHanging rack
Wherein: deltaSteelThe elongation of the steel strand;
ΔⅡthe deformation of the anchored double-spliced I-shaped steel is measured;
Δhanging rackIs the hanging basket displacement.
According to a calculation formula of the elongation of the steel strand: deltaSteelThe elongation of the steel strand can be obtained because the values are known, wherein P is the load of the cradle prepressing, L is the calculated length of the steel strand, E is the elastic modulus of the steel strand, and A is the effective section area of the steel strand; the differential equation for the beam's deflection line is: EI ω (x) ═ jjjjk (| m (x) dx) dx + C1x+C2Wherein E is the elastic modulus of the double-spliced I-steel in the ground anchor system, I is the section moment of inertia of the double-spliced I-steel, omega (x) is the deformation of the beam, M (x) is the bending moment value of the beam, and C1And C2Then is a constant, x is the distance from the action point of the concentrated force to the beam end, and the delta can be solved according to the structural mechanics formula and the position of the action point of the loadⅡ；
Then the hanging basket displacement calculation formula is as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535358.7A CN110607765B (en) | 2019-06-19 | 2019-06-19 | Intelligent bridge hanging basket prepressing device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535358.7A CN110607765B (en) | 2019-06-19 | 2019-06-19 | Intelligent bridge hanging basket prepressing device and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110607765A true CN110607765A (en) | 2019-12-24 |
| CN110607765B CN110607765B (en) | 2021-04-23 |
Family
ID=68890920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910535358.7A Active CN110607765B (en) | 2019-06-19 | 2019-06-19 | Intelligent bridge hanging basket prepressing device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110607765B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201128884Y (en) * | 2007-11-15 | 2008-10-08 | 中交第一公路工程局有限公司 | Loading prepressing device for suspended bracket |
| JP2009108633A (en) * | 2007-10-31 | 2009-05-21 | Ps Mitsubishi Construction Co Ltd | Corrugated steel sheet web bridge construction apparatus and construction method of corrugated steel sheet web bridge |
| CN202766971U (en) * | 2011-12-26 | 2013-03-06 | 中铁七局集团有限公司 | A ground counter-pull pre-pressing device for a continuous beam cantilever cast-in-place hanging basket |
| CN202787086U (en) * | 2012-08-24 | 2013-03-13 | 中铁十二局集团有限公司 | Cantilever pouring construction hanging-basket pre-pressing device |
| CN104746438A (en) * | 2015-01-28 | 2015-07-01 | 中国水利水电第五工程局有限公司 | Prepressing method for hanging basket jack |
| CN109682690A (en) * | 2019-01-22 | 2019-04-26 | 中铁十六局集团第五工程有限公司 | Hanging Basket artificial intelligence loading system |
-
2019
- 2019-06-19 CN CN201910535358.7A patent/CN110607765B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009108633A (en) * | 2007-10-31 | 2009-05-21 | Ps Mitsubishi Construction Co Ltd | Corrugated steel sheet web bridge construction apparatus and construction method of corrugated steel sheet web bridge |
| CN201128884Y (en) * | 2007-11-15 | 2008-10-08 | 中交第一公路工程局有限公司 | Loading prepressing device for suspended bracket |
| CN202766971U (en) * | 2011-12-26 | 2013-03-06 | 中铁七局集团有限公司 | A ground counter-pull pre-pressing device for a continuous beam cantilever cast-in-place hanging basket |
| CN202787086U (en) * | 2012-08-24 | 2013-03-13 | 中铁十二局集团有限公司 | Cantilever pouring construction hanging-basket pre-pressing device |
| CN104746438A (en) * | 2015-01-28 | 2015-07-01 | 中国水利水电第五工程局有限公司 | Prepressing method for hanging basket jack |
| CN109682690A (en) * | 2019-01-22 | 2019-04-26 | 中铁十六局集团第五工程有限公司 | Hanging Basket artificial intelligence loading system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110607765B (en) | 2021-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107905109B (en) | Equal-load simulation segmented preloading construction method for crossing type bridge cast-in-place platform | |
| CN108457188A (en) | A kind of walking incremental launching construction by multipoint jacking construction | |
| CN102051858B (en) | Jack loading triangular truss hanging basket and load test construction method thereof | |
| CN109778721A (en) | Synchronization of jacking up bridge top and the bottom structure carries out the method that bridge increases transformation | |
| CN101824801B (en) | Non-in-situ prepressing method of self-anchored type support frame and self-anchored type support frame thereof | |
| CN204849607U (en) | A continuous beam string basket pre -compaction device for bridge construction | |
| CN103470041B (en) | The cast-in-place concrete beam template steel pipe support precompressed construction method that adopts loose sand to load | |
| CN103174097A (en) | Supporting pre-stress back tension loading and pre-pressing method for upper steel structure of large-span bridge | |
| CN212925807U (en) | Cast-in-place continuous box girder side span straightway template support system | |
| CN205223871U (en) | Suspension bridge bridge tower overarm brace pre -compaction device | |
| CN110940571B (en) | Test device for simulating dynamic soil arch effect of shed frame structure | |
| CN100422445C (en) | Steel strand reversal fulcrum preloading method | |
| CN115753338A (en) | Composite bearing capacity test device and method based on power transmission tower anchor cable bearing platform | |
| CN214695184U (en) | Pre-pressing system for double-thin-wall pier beam support bracket | |
| CN107101872A (en) | Reinforced beam torsion test device | |
| CN204112240U (en) | The overall prepressing device of Hanging Basket | |
| CN201495493U (en) | Counter-pressure preloading device of hydraulic jack | |
| CN211079936U (en) | Novel assembled high-shear-resistance bailey bracket | |
| CN110607765B (en) | Intelligent bridge hanging basket prepressing device and control method thereof | |
| CN205676784U (en) | Bracket reverse drawing loads prepressing device | |
| CN110565540A (en) | Novel assembly type high-shear-resistance bailey bracket and construction method thereof | |
| CN206696076U (en) | Reinforced beam torsion test device | |
| CN111501577B (en) | Hanging basket integral prepressing detection method | |
| CN112921829B (en) | Prepressing device for overpass bridge hanging basket construction and prepressing loading method thereof | |
| CN105155424B (en) | A kind of arch door shape steel leaning tower Inclined cable-stayed construction technology |
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 |