CN111764307A - Reaction frame structure and construction method thereof - Google Patents
Reaction frame structure and construction method thereof Download PDFInfo
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- CN111764307A CN111764307A CN202010785953.9A CN202010785953A CN111764307A CN 111764307 A CN111764307 A CN 111764307A CN 202010785953 A CN202010785953 A CN 202010785953A CN 111764307 A CN111764307 A CN 111764307A
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- 238000010276 construction Methods 0.000 title abstract description 39
- 230000008093 supporting effect Effects 0.000 claims abstract description 68
- 238000000034 method Methods 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000009415 formwork Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 11
- 238000005056 compaction Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000003466 welding Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000001976 improved effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001669679 Eleotris Species 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention discloses a reaction frame structure and a construction method thereof, and relates to the technical field of bridge construction. First supporting beam and second supporting beam including parallel arrangement, the first end of first supporting beam with the first end of second supporting beam set up respectively in web concrete structure, first supporting beam with be provided with the third supporting beam between the second supporting beam, the second end of first supporting beam with the second end of second supporting beam passes through the third supporting beam is connected, the second end of second supporting beam is provided with to the jack that the effort was applyed to the second supporting beam, the jack is located the second supporting beam deviates from one side of third supporting beam. The influence of external environment can be reduced, and the construction progress is promoted.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a reaction frame structure and a construction method thereof.
Background
The hanging basket is used as main equipment for the construction of the cantilever casting continuous beam, is a bearing framework capable of sliding along the beam top, is various in form, and has the advantages of being clear in stress, simple in structure, stable, simple and convenient to calculate and the like. As a construction facility for bridge sections, it has been widely used in bridge construction.
The safety performance of the cradle structure is very important to detect, the main framework serves as a core stress component of the cradle, the detection of the bearing capacity of the main framework is more critical, and the cradle pre-pressing is needed before construction in order to detect the overall stability of the cradle structure under the action of equivalent load and the stress characteristic of a main bearing structure before formal cantilever beam construction. On one hand, the structural safety performance of the cantilever beam can be practically checked, on the other hand, the working conditions of each section of the construction process can be simulated, the deformation data of the main frame can be summarized, and reference data can be provided for the linear monitoring of the cantilever beam construction.
The traditional prepressing modes such as preloading, jack tension steel strand prepressing and water tank prepressing have long time consumption and large material mechanical investment, are greatly influenced by external environment and influence the construction progress.
Disclosure of Invention
The invention aims to provide a reaction frame structure which can reduce the influence of the external environment and improve the construction progress.
The embodiment of the invention is realized by the following steps:
in one aspect of the embodiments of the present invention, a reaction frame structure is provided, which is disposed in a web concrete structure, and includes a first support beam and a second support beam that are disposed in parallel, a first end of the first support beam and a first end of the second support beam are disposed in the web concrete structure, respectively, a third support beam is disposed between the first support beam and the second support beam, a second end of the first support beam and a second end of the second support beam are connected by the third support beam, a second end of the second support beam is provided with a jack that applies an acting force to the second support beam, and the jack is located on a side of the second support beam away from the third support beam.
Optionally, the length of the first support beam is less than the length of the second support beam.
Optionally, the length of the first end of the first support beam embedded into the web concrete structure is greater than or equal to the exposed length of the first support beam.
Optionally, the length of the first end of the second support beam embedded into the web concrete structure is smaller than the exposed length of the second support beam.
Optionally, one end of the jack abuts against the second support beam, and the other end of the jack abuts against a bottom formwork longitudinal beam on the web concrete structure.
Optionally, a base plate is arranged between the jack and the bottom die longitudinal beam.
Optionally, the first support beam, the second support beam and the third support beam are integrally formed, or the first support beam and the second support beam are respectively fixed to the web concrete structure and assembled with the third support beam.
Optionally, both ends of the third supporting beam are respectively provided with a tangent plane, and the tangent planes are respectively attached to the side surfaces of the first supporting beam and the second supporting beam.
Optionally, the first support beam, the second support beam and the third support beam are arranged in multiple groups and located on two opposite sides of the web concrete structure respectively.
In another aspect of the embodiments of the present invention, a method for constructing a reaction frame structure is provided, where the method includes: fixing and molding the first support beam, the second support beam and the third support beam to form a frame structure; hoisting the frame structure to a preset position, and relatively fixing the frame structure and a pouring template; pouring concrete into the pouring template, and condensing the first end of the first supporting beam and the first end of the second supporting beam in a web concrete structure formed by the concrete; arranging a jack at a bottom die longitudinal beam of the web concrete structure, so that the jack can be abutted against the second end of the second support beam; setting a monitoring point position, determining a pre-pressing load, and loading a force application load on the jack in a grading manner; and observing the settlement value of the monitoring point location at each stage of loading, and analyzing the observed data.
The embodiment of the invention has the beneficial effects that:
according to the reaction frame structure and the construction method thereof provided by the embodiment of the invention, the first support beam and the second support beam are arranged in parallel, the first end of the first support beam and the first end of the second support beam are respectively arranged in the web plate concrete structure, and when the web plate concrete structure is cast and formed, the first support beam and the second support beam are directly cast and formed together with the web plate concrete structure and fixed. Adopt above-mentioned form, need not to set up at web concrete structure's side and reserve the piece, the rethread is reserved the piece and is connected fixedly, has simplified the installation fixed form, is favorable to promoting the construction progress. Through the third supporting beam that sets up between first supporting beam and the second supporting beam, and the second end of first supporting beam and the second end of second supporting beam pass through the third supporting beam and connect, when exerting the effort to the second end of second supporting beam through the jack, can simulate the concrete and heavily divide the section and load the pre-compaction step by step. Adopt the reaction frame structure of this application to compare with traditional pre-compaction form, overcome that current string basket surmounts the pre-compaction operation middling pressure heavy object material many, material machinery drops into big, consuming time long scheduling problem, overcome the shortcoming that aquatic bridge string basket below sets up fixed anchor spindle difficulty. The influence of external environment can be reduced, and the construction progress is promoted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a reaction frame structure according to an embodiment of the present invention;
FIG. 2 is a structural diagram of a third support beam according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a construction method of a reaction frame structure according to an embodiment of the present invention.
Icon: 100-reaction frame structure; 105-web concrete structure; 107-bottom die longitudinal beams; 110-a first support beam; 120-a second support beam; 130-a third support beam; 132-cutting the noodles; 140-a jack; 150-backing plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The continuous beam hanging basket is used as a movable template supporting system, and in order to test the overall stability of the hanging basket under the action of equivalent load and the stress characteristic of a main bearing structure, hanging basket pre-pressing is required before construction to ensure that the hanging basket has enough rigidity and stability. The traditional prepressing modes such as preloading, jack tension steel strand prepressing method and water tank prepressing have long time consumption and large material mechanical investment and are greatly influenced by topographic, geological and hydrological conditions. This application adopts reaction frame structure 100 in order to realize required pre-compaction test, can be better avoid above-mentioned problem.
Referring to fig. 1, the embodiment provides a reaction frame structure 100 disposed on a web concrete structure 105, including a first supporting beam 110 and a second supporting beam 120 disposed in parallel, a first end of the first supporting beam 110 and a first end of the second supporting beam 120 are disposed on the web concrete structure 105, respectively, a third supporting beam 130 is disposed between the first supporting beam 110 and the second supporting beam 120, a second end of the first supporting beam 110 and a second end of the second supporting beam 120 are connected by the third supporting beam 130, a second end of the second supporting beam 120 is disposed with a jack 140 for applying an acting force to the second supporting beam 120, and the jack 140 is located on a side of the second supporting beam 120 departing from the third supporting beam 130.
Specifically, reaction frame structure 100 of this application, when setting up the installation, can be directly assemble the completion back at ground welding, hoist to predetermineeing the position. And the first ends of the first support beam 110 and the second support beam 120 are respectively located at the spatial position where the web concrete structure 105 is located. When the web concrete structure 105 is formed by pouring, the first supporting beam 110 and the second supporting beam 120 are fixedly connected with the web concrete structure 105, so that the fixing form is simplified, and the construction progress is promoted.
After the first end of the first support beam 110 and the first end of the second support beam 120 are fixed to the web concrete structure 105, the second end of the first support beam 110 and the second end of the second support beam 120 pass through the connected third support beam 130, so that a triangular stable support structure is formed among the first support beam 110, the side wall of the web concrete structure 105, the second support beam 120 and the third support beam 130, which is beneficial to improving the stability of the overall structural support.
By providing a jack 140 at a second end of the second support beam 120 for applying a force to the second support beam 120, the jack 140 is located on a side of the second support beam 120 facing away from the third support beam 130. This simulates the form of pre-compression. Specifically, according to the force transfer characteristic of continuous beam cantilever casting, during the concrete casting period, the load at the positions of the bottom plate and the web plate is firstly transferred to the front and rear lower beams of the hanging basket from the bottom die and then transferred to the main truss acting on the bridge floor and the rear anchor position of the bottom basket through hanging. The load of the top plate is transmitted to the main truss and the rear anchor position of the bottom basket by the hanging through the front end part of the inner and outer sliding beams, and the rear end part is directly anchored on the bridge deck of the poured front section by the inner hanging. By adopting the mode of loading the jack 140, all loads under the limit condition are transmitted to the front and rear lower beams of the hanging basket by the bottom die and then transmitted to the main truss acting on the bridge floor and the rear anchor position of the bottom basket by the hanging. Therefore, the concrete load is simulated to act on the hanging basket bottom plate for pre-pressing loading. I.e., the opposing force through the reaction frame structure 100, to simulate the force-bearing process described above.
In the reaction frame structure 100 according to the embodiment of the present invention, the first support beam 110 and the second support beam 120 are arranged in parallel, the first end of the first support beam 110 and the first end of the second support beam 120 are respectively arranged in the web concrete structure 105, and when the web concrete structure 105 is cast, the first support beam 110 and the second support beam 120 are directly cast together with the web concrete structure 105 and fixed. By adopting the form, the reserved part is not required to be arranged on the side edge of the web concrete structure 105, and then the reserved part is connected and fixed, so that the installation and fixing form is simplified, and the construction progress is favorably promoted. Through the third support beam 130 arranged between the first support beam 110 and the second support beam 120, and the second end of the first support beam 110 and the second end of the second support beam 120 are connected through the third support beam 130, when acting force is applied to the second end of the second support beam 120 through the jack 140, the concrete heavy subsection step-by-step loading prepressing can be simulated. Compared with the traditional prepressing mode, the reaction frame structure 100 overcomes the problems of more heavy materials, large material mechanical investment, long consumed time and the like in the existing hanging basket stacking prepressing operation, and overcomes the defect of difficulty in setting the fixed anchor ingots below the hanging basket of the bridge in water. The influence of external environment can be reduced, and the construction progress is promoted.
Alternatively, as shown in fig. 1, the length of the first support beam 110 is less than the length of the second support beam 120. Thus, on the premise of ensuring the stability of the reaction frame structure 100, the jack 140 can be arranged at a proper position and can bear force stably through the arrangement form of the second support beam 120 according to the requirement of actual pre-pressing force.
Optionally, as shown in fig. 1, the length of the first end of the first support beam 110 embedded into the web concrete structure 105 is greater than or equal to the exposed length of the first support beam 110.
Specifically, the first end of the first support beam 110 (i.e., the dotted line portion of the first support beam 110 in fig. 1) needs to be stably connected to the web concrete structure 105, and thus, the length of the first end of the first support beam 110 extending into the web concrete structure 105 cannot be too short. Meanwhile, since the first support beam 110 bears a large force when the jack 140 works, in order to avoid an excessive deformation of the first support beam 110 due to the force, the exposed length of the first support beam 110 cannot be too long, so that the first support beam 110 can bear the large force. Therefore, in order to ensure the stability and better bearing capacity of the connection, in a preferred embodiment, the length of the first end of the first support beam 110 embedded into the web concrete structure 105 is greater than or equal to the exposed length of the first support beam 110.
Alternatively, as shown in fig. 2, the length of the first end of the second support beam 120 embedded into the web concrete structure 105 is less than the length of the second support beam 120 exposed.
In particular, the first end of the second support beam 120 (i.e., the dashed portion of the second support beam 120 in fig. 1) is required to provide favorable conditions for the placement of the jack 140 while ensuring a stable connection with the web concrete structure 105. When the jack 140 operates, the jack 140 provides a force to the second end of the second support beam 120 and plays a supporting role through the third support beam 130 to form a cradle preloading system.
As shown in fig. 1, when the jack 140 and the third support beam 130 support to form a cradle preloading system, one end of the jack 140 abuts against the second support beam 120, and the other end of the jack 140 abuts against the bottom mold longitudinal beam 107 on the web concrete structure 105. In this way, the reaction force of the reaction frame structure 100 is easily utilized and transmitted to the bottom mold side member 107 via the jack 140, and the required preload is applied to the bottom mold side member 107.
As shown in fig. 1, a pad 150 is disposed between the jack 140 and the bottom mold stringer 107.
For example, the tie plate 150 may be made of sleeper or i-beam, etc. to increase the contact area with the bottom mold stringer 107. Thereby reducing stress concentrations. In addition, through setting up backing plate 150, can make die block longeron 107 atress more even, hang basket pre-compaction load and also more be close to actual construction conditions, be favorable to promoting the accuracy of hanging basket pre-compaction.
Alternatively, the first support beam 110, the second support beam 120 and the third support beam 130 are integrally formed, or the first support beam 110 and the second support beam 120 are respectively fixed to the web concrete structure 105 and assembled with the third support beam 130.
When the first support beam 110, the second support beam 120, and the third support beam 130 are integrally formed, the profile may be welded and formed at a construction site after being transported to the site, and then hoisted to a predetermined position for fixing. When the first support beam 110 and the second support beam 120 are fixed to the web concrete structure 105 and assembled with the third support beam 130, the first support beam 110 and the second support beam 120 may be fixed to the corresponding positions of the web concrete structure 105 to be formed, and the first support beam 110 and the second support beam 120 may be fixed to the web concrete structure 105 during the forming process of the web concrete structure 105. After the first and second support beams 110 and 120 are fixed, the third support beam 130 may be hoisted between the first and second support beams 110 and 120 for welding.
As shown in fig. 1 and 2, the third support beam 130 has cut surfaces 132 at both ends thereof, and the cut surfaces 132 are respectively attached to the first support beam 110 and the second support beam 120.
Thus, when the first supporting beam 110 is connected to the second supporting beam 120 through the third supporting beam 130, the tangent plane 132 of the third supporting beam 130 can be better attached to the side surfaces of the first supporting beam 110 and the second supporting beam 120, which is beneficial to improving the welding quality, ensuring the structural strength of the joint, and improving the overall stability and reliability of the reaction frame structure 100.
Optionally, the first support beam 110, the second support beam 120, and the third support beam 130 are provided in multiple groups, and are respectively located at opposite sides of the web concrete structure 105.
Specifically, in the construction process, in order to ensure the stability of the cradle in use, the reaction frame structures 100 are required to be arranged at intervals and respectively arranged at the opposite sides of the web concrete structure 105. Illustratively, 4 sets of reaction frame structures 100 may be provided, and two sets may be provided on one side of the web concrete structure 105 to ensure stable support.
Optionally, the first support beam 110, the second support beam 120, and the third support beam 130 are double-split i-beams. Therefore, the connection strength can be improved, the stability of the structure is improved when the jack 140 is used for pre-pressing, and the test error is reduced.
As shown in fig. 3, an embodiment of the present invention further provides a construction method of the reaction frame structure 100, where the method includes:
and S100, fixing and forming the first support beam 110, the second support beam 120 and the third support beam 130 to form a frame structure.
Specifically, the first support beam 110, the second support beam 120 and the third support beam 130 may be made of standard section bars, and after the required section bars are transported to a construction site, the first support beam 110, the second support beam 120 and the third support beam 130 may be welded, fixed and formed at the construction site to form a required frame structure. Therefore, the construction quality is easier to control, and the construction difficulty is reduced.
S200, hoisting the frame structure to a preset position, and relatively fixing the frame structure and the pouring template.
Specifically, after the required frame structure is hoisted to the preset position, in order to ensure that the actual consolidation position of the frame structure does not deviate in the process of pouring the web concrete structure 105, the frame structure and the pouring template can be relatively fixed. The pouring template is used for pouring and molding the web concrete structure 105, and when the frame structure and the pouring template are relatively fixed, the first supporting beam 110 and the second supporting beam 120 can be connected and fixed with reinforcing steel bars and the like arranged in the web concrete structure 105, so that the position deviation in the pouring process is avoided, and the position precision of the frame structure in the fixing process is favorably ensured.
S300, concrete is poured into the pouring formwork, so that the first end of the first support beam 110 and the first end of the second support beam 120 are condensed in the web concrete structure 105 formed of concrete.
Thus, after the web concrete structure 105 is solidified and formed, the frame structure is directly and fixedly connected with the web concrete structure 105, and a triangular stable connection is formed between the frame structure and the side wall of the web concrete structure 105, so that a foundation is provided for stable support of the frame structure.
And S400, arranging the jack 140 at the bottom die longitudinal beam 107 on the web concrete structure 105, so that the jack 140 can be abutted against the second end of the second support beam 120.
Specifically, since the jack 140 is in contact with the second end of the second support beam 120 by the stroke of the jack 140, in order to prevent the shift of the jack 140 caused by the lateral movement of the cradle during the pre-pressing process, a position limiting member may be disposed at a position corresponding to the jack 140 to prevent the lateral shift of the jack 140. Thus, the stability of the jack 140 in use can be improved. In addition, in order to increase the contact area between the jacks 140 and the bottom die longitudinal beams 107, the form of the base plate 150 arranged between the jacks 140 and the bottom die longitudinal beams 107 can be adopted, and meanwhile, the stability of the cradle can be ensured by adding stiffening plates at corresponding positions of the bottom die longitudinal beams 107.
S500, setting a monitoring point position, determining a pre-pressing load, and loading a force application load on the jack 140 in a grading manner.
Specifically, in the construction process, in order to ensure the stability of the cradle in use, the reaction frame structures 100 are required to be arranged at intervals and respectively arranged at the opposite sides of the web concrete structure 105. Illustratively, 4 sets of reaction frame structures 100 may be provided, and two sets may be provided on one side of the web concrete structure 105 to ensure stable support. In addition, in order to ensure the synchronous stability, a 1-to-4 intelligent tensioning machine can be adopted.
The monitoring points can be arranged at the hanging point position of the front hanging belt and the jacking position of the jack 140, after the pre-pressing load is determined, when the force application load is loaded on the jack 140 in stages, the four-stage load of 10%, 50%, 100% and 120% of the load is respectively loaded in the loading process, the load reduction is performed according to four stages of 100%, 50%, 10% and no-load, after the load reduction or each stage of load reduction is completed, the static load is 15min, and the static load is 2h after the 4-stage load is completed.
S600, observing settlement values of the monitoring point positions in each stage of loading, and analyzing observation data.
When the jack 140 is loaded with a force application load in a grading manner, the settlement value of each observation point at each stage of prepressing needs to be observed, and then observation data is analyzed, so that reliable data support is provided for subsequent continuous beam hanging basket construction.
According to the construction method of the reaction frame structure 100 provided by the embodiment of the invention, in actual construction, the whole construction welding and hoisting time is only 1 day, the prepressing process is only 0.5 day, large-scale mechanical equipment investment is not needed, and excessive prepressing materials are not needed, so that the project cost is greatly saved. And hang basket pre-compaction and adopt reaction frame construction, do not receive any geography, surrounding environment influence, directly carry out the pre-compaction construction at hanging basket die block, convenient operation, the security obtains guaranteeing.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a reaction frame structure, sets up in web concrete structure, its characterized in that, including parallel arrangement's first supporting beam and second supporting beam, the first end of first supporting beam with the first end of second supporting beam set up respectively in web concrete structure, first supporting beam with be provided with a third supporting beam between the second supporting beam, the second end of first supporting beam with the second end of second supporting beam passes through a third supporting beam connects, the second end of second supporting beam is provided with to the jack that effort was applyed to the second supporting beam, the jack is located the second supporting beam deviates from one side of third supporting beam.
2. A reaction frame structure according to claim 1, wherein the length of the first support beam is less than the length of the second support beam.
3. The reaction frame structure of claim 1 or 2, wherein the length of the first end of the first support beam embedded into the web concrete structure is greater than or equal to the exposed length of the first support beam.
4. The reaction frame structure of claim 1 or 2, wherein the length of the first end of the second support beam embedded into the web concrete structure is less than the length of the second support beam exposed.
5. The reaction frame structure of claim 1 wherein one end of the jack abuts against the second support beam and the other end of the jack abuts against a bottom formwork stringer on the web concrete structure.
6. The reaction frame structure according to claim 5, wherein a cushion plate is provided between the jack and the bottom die longitudinal beam.
7. The reaction frame structure of claim 1, wherein the first support beam, the second support beam and the third support beam are integrally formed, or the first support beam and the second support beam are respectively fixed to the web concrete structure and assembled with the third support beam.
8. A reaction frame structure according to claim 1 or 7, wherein the third support beam is provided with cut surfaces at both ends thereof, the cut surfaces being laterally attached to the first support beam and the second support beam, respectively.
9. A reaction frame structure according to claim 1, wherein the first support beam, the second support beam and the third support beam are arranged in groups and located on opposite sides of the web concrete structure, respectively.
10. A method of constructing a reaction frame structure, the method comprising:
fixing and molding the first support beam, the second support beam and the third support beam to form a frame structure;
hoisting the frame structure to a preset position, and relatively fixing the frame structure and a pouring template;
pouring concrete into the pouring template, and condensing the first end of the first supporting beam and the first end of the second supporting beam in a web concrete structure formed by the concrete;
arranging a jack at a bottom die longitudinal beam of the web concrete structure, so that the jack can be abutted against the second end of the second support beam;
setting a monitoring point position, determining a pre-pressing load, and loading a force application load on the jack in a grading manner;
and observing the settlement value of the monitoring point location at each stage of loading, and analyzing the observed data.
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| CN202010785953.9A CN111764307A (en) | 2020-08-06 | 2020-08-06 | Reaction frame structure and construction method thereof |
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| KR20050091251A (en) * | 2004-03-11 | 2005-09-15 | 엠에스아시아 주식회사 | Construction method for bridge using a form traveller |
| CN202023150U (en) * | 2011-03-03 | 2011-11-02 | 中铁四局集团第一工程有限公司 | Reaction frame pre-pressing system used in bridge hanging basket construction |
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