CN111730738A - Prefabricated box girder diaphragm plate connecting structure and construction method thereof - Google Patents
Prefabricated box girder diaphragm plate connecting structure and construction method thereof Download PDFInfo
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- CN111730738A CN111730738A CN202010617888.9A CN202010617888A CN111730738A CN 111730738 A CN111730738 A CN 111730738A CN 202010617888 A CN202010617888 A CN 202010617888A CN 111730738 A CN111730738 A CN 111730738A
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- box girder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/002—Apparatus for washing concrete for decorative purposes or similar surface treatments for exposing the texture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0025—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects with installation or service material, e.g. tubes for electricity or water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
- B28B23/024—Supporting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a prefabricated box girder diaphragm plate connecting structure and a construction method thereof, wherein the prefabricated box girder diaphragm plate connecting structure comprises a prefabricated concrete box girder single body, the prefabricated concrete box girder single body comprises a prefabricated concrete box girder body, flange plates are arranged on two sides of a top plate of the prefabricated concrete box girder body, a box girder bottom plate is arranged at the bottom of the prefabricated concrete box girder body, a top plate connecting main rib is pre-embedded in each flange plate, and the top plate connecting main rib and the flange plates are integrally cast and molded; connect through wet seam between the free flange plate of two adjacent precast concrete box girder, all pre-buried connecting steel sleeve that is equipped with about in the precast concrete box girder monomer curb plate is equipped with a plurality of cross slab horizontal distribution reinforcing bars in the centre, and the cross slab connects the main muscle both ends and passes the connecting steel sleeve in the adjacent precast concrete box girder monomer and connect adjacent cross slab. The invention can effectively avoid the dislocation of the diaphragm plates, improve the use efficiency of the integrated template and achieve the aim of saving and generating good economic and social benefits.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a prefabricated box girder diaphragm connecting structure and a construction method thereof.
Background
In the construction of highway bridges, the construction is generally carried out by adopting a prefabricated box girder mode. In order to strengthen the integral rigidity, the prefabricated box girder is provided with a diaphragm plate for connection. When prefabricating a box girder, the diaphragm is usually cast together with the girder. However, in the installation process of the precast box girder, the phenomenon that the diaphragm plates are dislocated often occurs, and the diaphragm plates are more prominent particularly when a curved bridge and a skew bridge are installed. The main reasons for the dislocation of the diaphragm plates are as follows: 1) the external dimension of the precast beam template or the angle in the direction of the diaphragm beam has deviation; 2) the diaphragm beam template has deviation during installation; 3) the hoisting position of the precast beam has deviation; the dislocation of the diaphragm plates not only can affect the overall beauty of the bridge, but also takes time and labor for treatment. The use function of the bridge is even affected by serious malposition.
In addition, when more and more automatic beam yards are used for producing precast box beams, the integral hydraulic external mold is basically adopted, the angle diaphragm plate template is installed and disassembled, the time and labor are more, and the work efficiency of mechanical operation is reduced.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a transverse clapboard connecting structure of a precast box girder and a construction method thereof, which can effectively avoid the dislocation of the transverse clapboard, improve the use efficiency of an integrated template and achieve the aim of saving and generating good economic and social benefits.
In order to achieve the purpose, the invention provides the following technical scheme that the connecting structure of the diaphragm plate of the precast box girder comprises a precast concrete box girder monomer, wherein the precast concrete box girder monomer comprises a precast concrete box girder body, flange plates are arranged on two sides of a top plate of the precast concrete box girder body, a box girder bottom plate is arranged at the bottom of the precast concrete box girder body, a top plate connecting main rib is pre-embedded in each flange plate, and the top plate connecting main rib and the flange plates are integrally cast and molded; connect through wet seam between the free flange plate of two adjacent precast concrete box girder, all pre-buried connecting steel sleeve that is equipped with about in the precast concrete box girder monomer curb plate is equipped with a plurality of cross slab horizontal distribution reinforcing bars in the centre, and the cross slab connects the main muscle both ends and passes the connecting steel sleeve in the adjacent precast concrete box girder monomer and connect adjacent cross slab.
Furthermore, the horizontally distributed reinforcing steel bars of the transverse partition plates are embedded in the concrete box girder single side plates and are upwards bent and arranged on the inner side of the outer die, after the outer die is disassembled, the horizontally distributed reinforcing steel bars of the transverse partition plates are straightened, and the transverse partition plates are poured after the reinforcing steel bars in the horizontally distributed reinforcing steel bars of the adjacent transverse partition plates are aligned.
Further, still be equipped with vertical reinforcing bar in the cross slab, vertical reinforcing bar with cross slab horizontal distribution reinforcing bar colligation.
The invention also provides a construction method of the connecting structure of the diaphragm plates of the precast box girder, which comprises the following steps:
s1, installing a precast concrete box girder single template, and arranging all embedded parts in a box girder according to the position of a design drawing;
s2, pouring precast box girder concrete, removing the outer mold after the concrete generates certain strength, and exposing the horizontally distributed reinforcing steel bars and the reinforcing steel bar connecting sleeves of the diaphragm plate; flattening the horizontally distributed steel bars;
s3, after the prefabricated box girder is installed in place, inserting the connecting main ribs into the steel bar connecting sleeves for screwing, and welding the connecting main ribs of the two adjacent diaphragm plates after aligning; the top plate is connected with the main reinforcement for welding, the horizontally distributed reinforcements are aligned, and the longitudinally erected reinforcements are bound;
s4, installing a diaphragm plate template and pouring diaphragm plate concrete;
and S5, binding wet joint reinforcing steel bars, installing a template, and pouring wet joint concrete.
Further, in step S1, pre-buried roof connection owner muscle in the flange board of precast concrete box girder body roof both sides the one side that is close to the curb plate in flange board below and the bottom plate is equipped with a plurality of steel bar connection sleeve, is equipped with a plurality of horizontal distribution reinforcing bars between upper and lower steel bar connection sleeve.
Further, in step S2, the horizontally distributed steel bars are bent upward by the end of the outer mold and lean against the outer mold, and the inside of the outer mold is brushed with the slow-setting liquid.
Further, in the step S2, pouring precast box girder concrete, removing the outer mold after the concrete poured in the precast box girder reaches the strength, washing the concrete surface corresponding to the diaphragm plate with water, and exposing the horizontally distributed reinforcing steel bars and the reinforcing steel bar connecting sleeves of the diaphragm plate; and flattening the horizontally distributed reinforcing steel bars, and continuously washing until the concrete stones are exposed.
Further, in the step S3, after the prefabricated box girder is installed in place, the bottom plate connecting main ribs and the diaphragm connecting main ribs are respectively inserted into the corresponding steel bar connecting sleeves and then screwed, and the bottom plate connecting main ribs and the diaphragm connecting main ribs of two adjacent diaphragms are aligned and then welded; aligning and welding the top plate connecting main ribs; the horizontally distributed ribs are aligned, and the longitudinal erection steel bars are bound.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. according to the invention, the main connecting ribs are installed after the prefabricated box girder is installed, so that the angle is easy to adjust, the steel bars are convenient to align, and the problem of dislocation of the diaphragm plates is effectively solved.
2. The invention is used in common prefabricating yard, without special diaphragm plate steel mould, to make the side mould can be assembled in large blocks, to improve working efficiency, and overcome the problem of easy slurry leakage at the end in former diaphragm plate construction.
3. The invention can be used in large centralized prefabricating yard, which can effectively overcome the problem that the diaphragm plate template in the hydraulic integral template is not easy to be assembled and disassembled.
4. The invention can realize that the integral hydraulic side die and the sectional split type side die are not provided with the diaphragm plate template, thereby improving the integrity of the template and ensuring the construction quality.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a schematic view of the reinforcing bar coupler sleeve according to the present invention;
FIG. 4 is a schematic view of the horizontal distribution bar of the present invention being bent;
FIG. 5 is a schematic view of the overall structure of the present invention;
in the figure: 1-prefabricating a concrete box girder body; 2-box girder bottom plate; 3-steel bar connecting sleeve; 4-the bottom plate is connected with the main rib; 5, connecting the transverse partition plate with the main rib; 6-horizontally distributing steel bars on the transverse partition plate; 7-diaphragm plate; 8-longitudinal steel bars; 9-wet seaming; 10-connecting the top plate with the main rib; 11-flange plate.
Detailed Description
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.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1-5, the application provides a prefabricated box girder diaphragm connecting structure, which comprises a prefabricated concrete box girder single body, wherein the prefabricated concrete box girder single body comprises a prefabricated concrete box girder body 1, flange plates 11 are arranged on two sides of a top plate of the prefabricated concrete box girder body 1, a box girder bottom plate 2 is arranged at the bottom of the prefabricated concrete box girder body, top plate connecting main ribs 10 are pre-embedded in the flange plates 11, and the top plate connecting main ribs 10 and the flange plates 11 are integrally cast and molded; connect through wet seam 9 between two adjacent free flange plates of precast concrete case roof beam 11, all pre-buried connecting steel bar sleeve 3 that is equipped with about in the precast concrete case roof beam monomer curb plate, the centre is equipped with a plurality of cross slab horizontal distribution reinforcing bars 6, and 6 both ends of cross slab joint owner muscle are passed connecting steel bar sleeve 3 in the adjacent precast concrete case roof beam monomer and are connected adjacent cross slab 7.
In a further preferred embodiment, the horizontal distribution reinforcing steel bars 6 of the diaphragm plates are pre-embedded in the single side plates of the concrete box girder and are bent upwards and arranged on the inner side of the outer die, after the outer die is removed, the horizontal distribution reinforcing steel bars 6 of the diaphragm plates are straightened, and the horizontal distribution reinforcing steel bars 6 of the adjacent diaphragm plates are aligned and then poured. Still be equipped with vertical reinforcing bar 8 in the cross slab, vertical reinforcing bar 8 with cross slab horizontal distribution reinforcing bar 6 ligatures.
In the above embodiment, the precast concrete box girder single body is firstly subjected to formwork erecting and casting, before the precast concrete box girder single body is cast, the top plate connecting main rib 10 is arranged at the position of the flange plate 11, the top plate connecting main rib 10 extends to the outer side of the flange plate 11, the flange plates 11 of the adjacent precast concrete box girder single bodies are connected through a wet joint 9, a transverse partition plate is arranged below the flange plate 11, one end of a horizontal distribution steel bar 6 of the transverse partition plate is arranged in the precast concrete box girder body 1, when the transverse partition plate is poured at the other end, the bent horizontal distribution steel bars 6 of the diaphragm plate are straightly broken and arranged in the concrete poured by the diaphragm plate, steel bar connecting sleeves 3 are arranged below the flange plates 11 and in the box girder bottom plate 2, after the prefabricated box girder is installed in place, inserting the bottom plate connecting main ribs 4 and the top plate connecting main ribs 10 into the steel bar connecting sleeve 3 for screwing, aligning the bottom plate connecting main ribs 4 and the top plate connecting main ribs 10 of two adjacent diaphragm plates one by one, and then welding; the horizontally distributed ribs are aligned, the longitudinal erection steel bars are bound, and then the templates of the transverse partition plates are installed and poured.
The embodiment also provides a construction method of the connecting structure of the diaphragm plates of the precast box girder, which comprises the following steps:
s1, installing a precast concrete box girder single template, and arranging all embedded parts in a box girder according to the position of a design drawing;
s2, pouring precast box girder concrete, removing the outer mold after the concrete generates certain strength, and exposing the horizontally distributed reinforcing steel bars and the reinforcing steel bar connecting sleeve 3 of the diaphragm plate; flattening the horizontally distributed steel bars;
s3, after the prefabricated box girder is installed in place, inserting the connecting main ribs into the steel bar connecting sleeves 3 for screwing, and welding the connecting main ribs of the two adjacent diaphragm plates after aligning; the top plate is connected with the main reinforcement 10 for welding, the horizontally distributed reinforcements are aligned, and the longitudinal erection reinforcements are bound;
s4, installing a diaphragm plate template and pouring diaphragm plate concrete;
and S5, binding the wet joint 9 steel bars, installing a template, and pouring wet joint 9 concrete.
In above-mentioned construction step, pre-buried roof joint main muscle 10 in the flange plate 11 of 1 roof both sides of precast concrete box girder body the one side that is close to the curb plate in 11 below of flange plate and the bottom plate is equipped with a plurality of steel bar connection sleeve 3, is equipped with a plurality of horizontal distribution reinforcing bars between steel bar connection sleeve 3 about last. The horizontally distributed reinforcing steel bars are bent upwards by the end of the outer die and lean against the outer die, and the inner side of the outer die is brushed with the slow-setting liquid. Therefore, after the concrete in the concrete box girder body is solidified, the concrete close to the inner side of the outer mold is not completely solidified, the outer mold is disassembled after the concrete poured in the prefabricated box girder reaches the strength, the concrete surface corresponding to the diaphragm plate is washed by water, and the horizontally distributed reinforcing steel bars and the reinforcing steel bar connecting sleeve 3 of the diaphragm plate are exposed; and flattening the horizontally distributed reinforcing steel bars, and continuously washing until the concrete stones are exposed. After the prefabricated box girder is installed in place, the bottom plate connecting main ribs 4 and the diaphragm connecting main ribs 6 are respectively inserted into the corresponding steel bar connecting sleeves 3 and then screwed, and the bottom plate connecting main ribs 4 and the diaphragm connecting main ribs 6 of two adjacent diaphragms are aligned and then welded; aligning and welding the top plate connecting main rib 10; the horizontally distributed ribs are aligned, and the longitudinal erection steel bars are bound.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (8)
1. The utility model provides a prefabricated box girder diaphragm connection structure which characterized in that: the prefabricated concrete box girder comprises a prefabricated concrete box girder single body, wherein the prefabricated concrete box girder single body comprises a prefabricated concrete box girder body, flange plates are arranged on two sides of a top plate of the prefabricated concrete box girder body, a box girder bottom plate is arranged at the bottom of the prefabricated concrete box girder body, a top plate connecting main rib is pre-buried in the flange plates, and the top plate connecting main rib and the flange plates are integrally cast and molded; connect through wet seam between the free flange plate of two adjacent precast concrete box girder, all pre-buried connecting steel sleeve that is equipped with about in the precast concrete box girder monomer curb plate is equipped with a plurality of cross slab horizontal distribution reinforcing bars in the centre, and the cross slab connects the main muscle both ends and passes the connecting steel sleeve in the adjacent precast concrete box girder monomer and connect adjacent cross slab.
2. The precast box girder diaphragm plate connection structure according to claim 1, wherein: the transverse partition plate horizontally distributed reinforcing steel bars are embedded in the concrete box girder single side plates and are upwards bent and arranged on the inner side of the outer die, after the outer die is disassembled, the transverse partition plate horizontally distributed reinforcing steel bars are straightened, and the transverse partition plate pouring is carried out after the reinforcing steel bars in the adjacent transverse partition plate horizontally distributed reinforcing steel bars are aligned.
3. The precast box girder diaphragm plate connection structure according to claim 1, wherein: and longitudinal steel bars are further arranged in the transverse partition plate and are bound with the horizontally distributed steel bars of the transverse partition plate.
4. The construction method of the precast box girder diaphragm connection structure according to claim 1, comprising the steps of:
s1, installing a precast concrete box girder single template, and arranging all embedded parts in a box girder according to the position of a design drawing;
s2, pouring precast box girder concrete, removing the outer mold after the concrete generates certain strength, and exposing the horizontally distributed reinforcing steel bars and the reinforcing steel bar connecting sleeves of the diaphragm plate; flattening the horizontally distributed steel bars;
s3, after the prefabricated box girder is installed in place, inserting the connecting main ribs into the steel bar connecting sleeves for screwing, and welding the connecting main ribs of the two adjacent diaphragm plates after aligning; the top plate is connected with the main reinforcement for welding, the horizontally distributed reinforcements are aligned, and the longitudinally erected reinforcements are bound;
s4, installing a diaphragm plate template and pouring diaphragm plate concrete;
and S5, binding wet joint reinforcing steel bars, installing a template, and pouring wet joint concrete.
5. The construction method of the precast box girder diaphragm connection structure according to claim 4, wherein: in step S1, pre-buried roof connection owner muscle in the flange board of precast concrete box girder body roof both sides flange board below and bottom plate one side that is close to the curb plate is equipped with a plurality of steel bar connection sleeve, is equipped with a plurality of horizontal distribution reinforcing bars between upper and lower steel bar connection sleeve.
6. The construction method of the precast box girder diaphragm connection structure according to claim 5, wherein: in the step S2, the horizontally distributed steel bars are bent upward by the end of the outer mold and lean against the outer mold, and the inside of the outer mold is brushed with the slow-setting liquid.
7. The construction method of the precast box girder diaphragm connection structure according to claim 4, wherein: in the step S2, pouring precast box girder concrete, removing the outer mold after the concrete poured in the precast box girder reaches the strength, washing the concrete surface corresponding to the diaphragm plate with water, and exposing the horizontally distributed reinforcing steel bars and the reinforcing steel bar connecting sleeves of the diaphragm plate; and flattening the horizontally distributed reinforcing steel bars, and continuously washing until the concrete stones are exposed.
8. The construction method of the precast box girder diaphragm connection structure according to claim 4, wherein: in the step S3, after the prefabricated box girder is installed in place, the bottom plate connecting main ribs and the diaphragm connecting main ribs are respectively inserted into the corresponding steel bar connecting sleeves and then screwed, and the bottom plate connecting main ribs and the diaphragm connecting main ribs of two adjacent diaphragms are aligned and then welded; aligning and welding the top plate connecting main ribs; the horizontally distributed ribs are aligned, and the longitudinal erection steel bars are bound.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010617888.9A CN111730738A (en) | 2020-06-30 | 2020-06-30 | Prefabricated box girder diaphragm plate connecting structure and construction method thereof |
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| CN202010617888.9A CN111730738A (en) | 2020-06-30 | 2020-06-30 | Prefabricated box girder diaphragm plate connecting structure and construction method thereof |
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| CN111730738A true CN111730738A (en) | 2020-10-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593482A (en) * | 2020-12-04 | 2021-04-02 | 邹宇 | Prefabricated assembled concrete diaphragm structure and construction method |
| CN112627033A (en) * | 2020-12-04 | 2021-04-09 | 中国葛洲坝集团第一工程有限公司 | Diaphragm plate pouring template and method for precast beam on curved bridge |
| CN114737485A (en) * | 2022-05-13 | 2022-07-12 | 福建第一公路工程集团有限公司 | Construction method for preventing transverse partition plate from being dislocated by prefabricated box girder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593482A (en) * | 2020-12-04 | 2021-04-02 | 邹宇 | Prefabricated assembled concrete diaphragm structure and construction method |
| CN112627033A (en) * | 2020-12-04 | 2021-04-09 | 中国葛洲坝集团第一工程有限公司 | Diaphragm plate pouring template and method for precast beam on curved bridge |
| CN114737485A (en) * | 2022-05-13 | 2022-07-12 | 福建第一公路工程集团有限公司 | Construction method for preventing transverse partition plate from being dislocated by prefabricated box girder |
| CN114737485B (en) * | 2022-05-13 | 2023-06-23 | 福建第一公路工程集团有限公司 | Construction method for preventing dislocation of diaphragm plate of prefabricated box girder |
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Application publication date: 20201002 |