CN108286223B - Forming template for sectional one-time forming construction of box-type arch ring and construction method - Google Patents
Forming template for sectional one-time forming construction of box-type arch ring and construction method Download PDFInfo
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- CN108286223B CN108286223B CN201810340711.1A CN201810340711A CN108286223B CN 108286223 B CN108286223 B CN 108286223B CN 201810340711 A CN201810340711 A CN 201810340711A CN 108286223 B CN108286223 B CN 108286223B
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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
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a molding template for one-step molding construction of a box-type arch ring section and a construction method, wherein a bottom template, a top template, an inner template system, two symmetrically arranged lateral templates and two symmetrically arranged arch foot side templates of the molding template are formed; the construction method comprises the steps of firstly, erecting a supporting system; 2. supporting a forming template; 3. pouring concrete; 4. and forming the constructed arch ring. The top template of the forming template is formed by bending and processing the rectangular plane plate, and can be supported at one time when being supported, so that the construction procedure is reduced, the construction period is shortened, the production of construction joints can be greatly reduced, and the integrity of the constructed box-shaped arch ring formed by construction is high; the construction method carries out one-step forming construction on the middle span or the side span, effectively reduces the production of construction joints in the construction process, increases the integrity of the constructed box arch ring, simultaneously reduces the concrete setting time to a great extent, shortens the construction period and saves manpower.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a molding template for one-step molding construction of a box-type arch ring section and a construction method.
Background
At present, the method adopted for cast-in-situ construction of the full framing of the box-type arch bridge at home and abroad is split-ring and segmented pouring, the thin-wall box-type arch bridge is influenced by the characteristic of high reinforcement, the width of the baffle plate of the arch ring of the box body is about 0.2m, the protective layer and the reinforcing steel bar are removed, and the clear distance of the reinforcing steel bar is about 0.1 m; the longitudinal inclination angles of the two side spans are about 43 degrees, if the conventional split ring is adopted to pour the arch ring, no matter the construction method of the bottom plate, the rear partition plate, the top plate or the bottom plate, the partition plate and the rear top plate is adopted, the top of the partition plate is required to be covered with the partition plate top template to prevent concrete from collapsing during concrete pouring construction, but under the conditions that the reinforcement is extremely dense and the reinforcement clearance is small, the on-site operation and the difficulty thereof mainly exist as follows: if the clear distance of the steel bars is too small, if the top template of the sealing cover partition plate is required to cut all sealing cover materials according to the size of the steel bars, all sealing cover materials are put into the sealing cover at one time, and the material waste is huge; the construction of the top templates of the sealing cover partition plate requires the site positioning and cutting of all the top templates according to the positions of the reinforcing steel bars, so that the labor cost is huge; the operation space is too small, the baffle top template sealing cover is difficult to position and fix, the concrete line shape and the design deviation after pouring are huge, meanwhile, the steel bar clearance is too small, the construction joint treatment after pouring is difficult to reach the standard requirement, the full bridge stress and the design deviation are larger after the thin-wall box arch ring is formed, and huge potential safety hazards are left for the stress of the thin-wall box arch bridge.
Meanwhile, when pouring an arch ring in the traditional ring-dividing and segment-dividing construction method, a side span section is generally poured firstly, then a middle span section is poured, and finally a middle section is poured, wherein the pouring sequence of the construction method has the following defects: 1. when the side span is poured, the middle part of the full framing at the lower part is horizontally extruded, so that the full framing at the middle part of the main arch is easily deformed, and roof collapse is generated at the middle part of the full framing; 2. meanwhile, in the traditional ring-separating and sectional construction method, the construction of the partition board can be carried out after the concrete of the bottom board is condensed, and the construction of the top board can be carried out after the concrete of the partition board is condensed, or the construction of the top board can be carried out after the concrete of the bottom board and the concrete of the partition board are condensed, so that the construction period is long and the labor waste is large.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a molding template for one-time molding construction of a box-type arch ring segment, which divides a midspan section and a side span section through the arrangement of an assembled separation mechanism to ensure that the casting of concrete of the midspan section and the side span section is smoothly constructed; each top template is formed by bending and processing a rectangular plane plate, when the top templates are erected, the top templates can be erected at one time, the construction procedure is reduced, the construction period is shortened, meanwhile, the generation of construction joints can be greatly reduced, and the integrity of the constructed box-shaped arch ring formed by construction is high; according to the construction method, the concrete of the midspan section can be poured firstly, so that adverse effects such as concrete cracking after pouring is finished due to deformation of a supporting system can be prevented; the construction method has the advantages that the middle span section or the side span section is subjected to one-step forming construction, the top template of the partition plate does not need to be independently covered, the top template is covered at one time, the operation is simple and convenient, materials are saved, meanwhile, the production of construction joints in the construction process is effectively reduced, the integrity of the constructed box-shaped arch ring after construction forming is high, meanwhile, the concrete setting time is greatly shortened, the construction period is greatly shortened, and the labor is saved.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a box arch ring segmentation one-time molding is shaping template for construction which characterized in that: the constructed box-shaped arch ring comprises two side spans which are symmetrically distributed and a middle span which is connected between the two side spans, wherein the middle span is connected with the two side spans through a middle section; the constructed box-type arch ring comprises a bottom plate, a top plate and left and right webs, wherein the top plate is positioned right above the bottom plate, the webs are symmetrically distributed, the webs are vertically distributed, and the webs are respectively distributed between the left side and the right side of the bottom plate and the left side and the right side of the top plate; the inner cavity of the constructed box-type arch ring is divided into a plurality of box cavities by a plurality of partition walls which are arranged in parallel, the structures and the sizes of the partition walls are the same, the partition walls are arranged from left to right along the transverse bridge direction, and each partition wall is arranged along the longitudinal bridge direction; the structure and the size of the box cavities are the same, each box cavity is divided into a plurality of box body units by a plurality of partition boards distributed along the transverse bridge direction, and the partition boards are distributed from front to back along the longitudinal bridge direction; the partition wall is vertically arranged, the box body unit is an arc-shaped cavity, and the cross section of the box body unit is rectangular; the bottom plate, the top plate, the partition wall and the partition plate are all of reinforced concrete structures;
The forming template comprises a bottom template, a top template, an internal mold system, two symmetrically arranged lateral templates and two symmetrically arranged arch foot side templates, wherein the top template is arranged right above the bottom template; the internal mold system comprises a plurality of internal mold groups which are distributed from left to right, the structures and the sizes of the plurality of internal mold groups are the same, and the number of the internal mold groups is the same as that of the box cavities; each inner die set comprises a plurality of inner die plates which are arranged from front to back along the longitudinal bridge direction and are used for forming the box body unit;
two bottom separating pieces are symmetrically arranged on the bottom template, each bottom separating piece is uniformly distributed at the position of one middle section, and each bottom separating piece is supported between the bottom template and one inner template;
two top separating pieces are symmetrically arranged on the internal mold system, each top separating piece is uniformly distributed right above one bottom separating piece, and each top separating piece is supported between a top mold plate and one internal mold plate;
Each bottom partition piece and the top partition piece positioned right above the bottom partition piece are connected into an assembled partition mechanism through a plurality of middle partition pieces, the number of the middle partition pieces is the same as that of partition walls, and each middle partition piece is connected between two adjacent inner templates at left and right sides; the inner cavity of the molding template is divided into three molding cavities through the inner mold system and the two assembled separation mechanisms, and the three molding cavities are respectively a midspan section molding cavity for molding a midspan section and two side span molding cavities symmetrically distributed on two sides of the midspan section molding cavity and for molding a side span section.
Above-mentioned box arch ring segmentation one-time molding is formed with shaping template, characterized by: every cavity passageway that supplies the operating personnel to pass through all is provided with between inner formword and the top template, every all open on the inner formword confession cavity passageway installation's lower installation mouth, open on the top template confession cavity passageway installation's last installation mouth, the top template passes through cavity passageway and the inside intercommunication of inner formword.
Above-mentioned box arch ring segmentation one-time molding is formed with shaping template, characterized by: the top template and the bottom template are arc-shaped forming templates formed by bending rectangular flat templates; one cavity channel is arranged between each inner template and each top template;
The inner template is an arc-shaped template with a cavity inside and a rectangular cross section, the inner template comprises a lower plate, four side plates respectively arranged above the periphery side of the lower plate and an upper plate arranged right above the side plates, the upper plate and the lower plate are arc-shaped plates formed by bending rectangular flat plates, and the four side plates are supported between the upper plate and the lower plate;
the lower mounting opening is a first opening arranged in the middle of the upper plate, a notch for vibrating concrete is formed in the lower plate, and the notch is arranged along the length direction of the lower plate;
the upper mounting openings are second openings formed in the top template, one first opening is formed under each second opening, a surrounding structure is arranged between each first opening and the second opening right above the first opening, and the first openings, the second openings and the surrounding structure form a cavity channel.
Above-mentioned box arch ring segmentation one-time molding is formed with shaping template, characterized by: the rectangular shape of the first opening, the length of the first opening is 75 cm-80 cm, the width of the first opening is 50 cm-75 cm, the length of the notch is 40 cm-50 cm, and the width of the notch is 15 cm-20 cm.
Above-mentioned box arch ring segmentation one-time molding is formed with shaping template, characterized by: the four side plates comprise two partition wall forming side plates which are arranged along the longitudinal bridge direction and used for forming partition walls and two partition wall forming side plates which are arranged along the transverse bridge direction and used for forming the partition walls.
Above-mentioned box arch ring segmentation one-time molding is formed with shaping template, characterized by: the bottom and top dividers are each disposed along a transverse bridge.
Above-mentioned box arch ring segmentation one-time molding is formed with shaping template, characterized by: the thickness of each partition plate is the same from top to bottom, and the height of the box cavity is the same as the height of each partition plate.
The invention also provides a one-step molding construction method for the sectional part of the box-type arch ring, which is characterized by comprising the following steps:
step one, erecting a supporting system: setting up a supporting system for supporting the forming die plate;
step two, supporting a molding template, which comprises the following steps:
step 201, supporting a bottom template and an assembled separation mechanism: the bottom template and the assembled separation mechanism are supported on the supporting system which is erected in the first step, and the arch springing side template and the lateral template are supported at the same time;
Step 202, respectively binding reinforcing steel bars on a bottom plate, a plurality of partition plates and a plurality of partition walls of the constructed box-type arch ring on the bottom template supported in the step 201;
step 203, supporting an internal mold system: hoisting each inner template in the inner mould system in place;
step 204, binding reinforcing steel bars on the top plate of the constructed box arch ring on the inner mould system in step 203;
step 204, supporting a top template: erecting a top template to obtain the built and molded molding template, and obtaining the middle span molding cavity and the two side span molding cavities;
step three, concrete pouring, wherein the process is as follows:
step 301, pouring middle span concrete: performing concrete pouring in the midspan section forming cavity in the step 204, and completing the concrete pouring process of the midspan section;
step 302, pouring side span concrete: synchronously pouring concrete in the two side span forming cavities in the step 204, and completing the concrete pouring process of the two side spans;
step 303, pouring middle section concrete: after the concreting in the step 301 and the step 302 are all final setting, dismantling the assembled separation mechanism, and concreting the middle section;
Fourthly, forming the constructed arch ring: and (3) after the poured concrete in the step (303) is finally set, removing the inner templates in the inner mold system, and respectively removing the top templates, the bottom templates, the arch springside templates and the side templates.
The construction method is characterized in that: pre-pressing the support system in the first step before the forming template in the second step is erected, and monitoring deformation of the support system while pre-pressing;
the support system is a full framing, the transverse distance and the longitudinal distance of the vertical rods of the full framing are 600-900 mm, and the step distance is 900-1200 mm.
The construction method is characterized in that: in step 203, a cavity channel for operators to pass through is arranged between each inner template and each top template, a lower mounting port for mounting the cavity channel is formed in each inner template, an upper mounting port for mounting the cavity channel is formed in each top template, and the top templates are communicated with the inner template through the cavity channels;
the inner template is an arc-shaped template with a cavity inside and a rectangular cross section, the inner template comprises a lower plate, four side plates respectively arranged above the periphery side of the lower plate and an upper plate arranged right above the side plates, the upper plate and the lower plate are arc-shaped plates formed by bending rectangular flat plates, and the four side plates are supported between the upper plate and the lower plate;
The lower mounting opening is a first opening arranged in the middle of the upper plate, a notch for vibrating concrete is formed in the lower plate, and the notch is arranged along the length direction of the lower plate;
the upper mounting openings are second openings formed in the top template, one first opening is formed under each second opening, a surrounding structure is arranged between the first opening and the second opening right above the first opening, and the first opening, the second opening and the surrounding structure form a cavity channel;
in step 303, when the assembled separation mechanism is removed and when the inner template is removed in step four, the inner template is removed through the cavity channel;
and step four, after the inner template system is dismantled, carrying out reinforcement binding and concrete pouring construction on the area where the cavity channel is located in the constructed box-type arch ring.
Compared with the prior art, the invention has the following advantages:
1. the forming template comprises a bottom template, a top template right above the bottom template, an internal mold system between the bottom template and the top template, two symmetrically arranged lateral templates and two symmetrically arranged arch foot lateral templates, and has simple structure and good use effect.
2. According to the invention, the middle span and the side span are divided by the arrangement of the assembled separation mechanism, so that the smooth construction of the pouring of the concrete of the middle span and the side span is ensured.
3. Each top template of the forming template is formed by bending and processing a rectangular plane plate, the traditional top template comprises a top template body arranged on a top plate and a partition plate top template arranged above a partition plate, when the top template is constructed, as the constructed box-shaped arch ring is a thin-wall box-shaped arch ring, the thickness of the partition plate is small, the top template is required to be spliced through the top template body and the partition plate top template, the cutting and the splicing of the top template are carried out for multiple times, the construction process is complex, meanwhile, the construction joints in the construction process are increased, and the top templates are all formed by bending and processing the rectangular plane plate.
4. The invention can ensure that operators pass smoothly through the arrangement of the cavity channel, is mainly used for pouring and vibrating the bottom plate and dismantling the inner template after the concrete pouring is finished, and is convenient for controlling the quality in the concrete pouring process.
5. When the top template is supported, the slope of the side span is larger, so that the top template is supported on the side span for preventing concrete from overflowing downwards in the concrete pouring process, and the middle span is positioned at the position of the constructed box-shaped arch ring close to the vault, so that the linearity is gentle and the slope is smaller, the top template is not required to be supported, the construction quality of the constructed box-shaped arch ring is ensured, and the construction procedure is reasonably simplified.
6. When the concrete is poured, the reasonable selection of the concrete pouring sequence of the constructed box-type arch ring directly influences the forming quality of the concrete of the constructed box-type arch ring and the stability of a supporting system in the construction process, and the selection of the symmetrical pouring midspan section and the symmetrical pouring side span section firstly mainly has two reasons: on the one hand, as the inclination angle of the side span section is larger, if the side span section is poured first, the middle part of the support system is horizontally extruded, so that the middle part of the support system is easily deformed, and the middle part of the support system is propped up; on the other hand, as the middle support of the supporting system is higher than the two sides of the supporting system, the deformation of the supporting system is larger than that of the two sides, and in order to prevent the adverse effects such as concrete cracking after the casting is finished due to the deformation of the supporting system, the part with larger deformation of the supporting system is cast firstly during the concrete casting construction.
7. According to the invention, the constructed box-shaped arch ring is divided into the middle span section and the two side span sections, and in actual construction, the middle span section or the two side span sections are molded and poured at one time, and the top template is covered at one time without singly covering the top template, so that the operation is simple and convenient, the materials are saved, meanwhile, the production of construction joints in the construction process is effectively reduced, the integrity of the constructed thin-wall box-shaped arch ring after construction molding is strong, the concrete setting time is greatly shortened, the construction period is greatly shortened, and the manpower is saved. The invention is especially suitable for the construction of the large-span box-type arch ring with the span larger than 100 m.
In summary, the forming template of the invention divides the midspan section and the side span section through the arrangement of the assembled separation mechanism, so that the smooth construction of the pouring of the concrete of the midspan section and the side span section is ensured; each top template is formed by bending and processing a rectangular plane plate, when the top templates are erected, the top templates can be erected at one time, the construction procedure is reduced, the construction period is shortened, meanwhile, the generation of construction joints can be greatly reduced, and the integrity of the constructed box-shaped arch ring formed by construction is high; according to the construction method, the concrete of the midspan section can be poured firstly, so that adverse effects such as concrete cracking after pouring is finished due to deformation of a supporting system can be prevented; the construction method has the advantages that the middle span section or the side span section is subjected to one-step forming construction, the top template of the partition plate does not need to be independently covered, the top template is covered at one time, the operation is simple and convenient, materials are saved, meanwhile, the production of construction joints in the construction process is effectively reduced, the integrity of the constructed box-shaped arch ring after construction forming is high, meanwhile, the concrete setting time is greatly shortened, the construction period is greatly shortened, and the labor is saved.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic view of a forming die plate according to the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a schematic view of a construction state of a box arch ring constructed according to the present invention.
Fig. 4 is a section A-A of fig. 3.
FIG. 5 is a schematic view of the structure of the inner form of the present invention.
Fig. 6 is a schematic structural view of the upper plate of the present invention.
Fig. 7 is a schematic view of the structure of the lower plate of the present invention.
Fig. 8 is a block flow diagram of the construction method of the present invention.
Reference numerals illustrate:
1-side span section; 2-midspan section; 3-an intermediate section;
4-a support system; 5-a bottom plate; 6, a separator;
7-a top plate; 8-a bottom template; 9-an inner template;
9-1, lower plate; 9-2 side plates; 9-3-upper plate;
10-1-end templates; 10-2-side templates; 11-top template;
12-a box unit; 13-a lower support structure; 14-a first opening;
15-notch; 16-post-cast strip; 17-top separator;
18-a bottom separator; 19-a surrounding structure; 20-a second opening;
21-partition wall.
Detailed Description
The molding template for one-step molding construction of the box-type arch ring segments is shown in fig. 1 and 2, the constructed box-type arch ring comprises two side spans 1 which are symmetrically distributed and a middle span 2 which is connected between the two side spans 1, the middle span 2 is connected with the two side spans 1 through a middle section 3, and the structure of the constructed box-type arch ring is shown in fig. 3 and 4 in detail; the constructed box-type arch ring comprises a bottom plate 5, a top plate 7 positioned right above the bottom plate 5 and two webs which are symmetrically distributed left and right, wherein the two webs are vertically distributed and are respectively distributed between the bottom plate 5 and the left and right sides of the top plate 7; the inner cavity of the constructed box-type arch ring is divided into a plurality of box cavities by a plurality of partition walls 21 which are arranged in parallel, the structures and the sizes of the partition walls 21 are the same, the partition walls 21 are arranged from left to right along the transverse bridge direction, and each partition wall 21 is arranged along the longitudinal bridge direction; the structure and the size of the box cavities are the same, each box cavity is divided into a plurality of box body units 12 by a plurality of partition boards 6 distributed along the transverse bridge direction, and the partition boards 6 are distributed from front to back along the longitudinal bridge direction; the partition wall 21 is vertically arranged, the box body unit 12 is an arc-shaped cavity, and the cross section of the box body unit is rectangular; the bottom plate 5, the top plate 7, the partition wall 21 and the partition plate 6 are all of reinforced concrete structures;
The forming template comprises a bottom template 8, a top template 11, an internal mold system, two symmetrically arranged lateral templates 10-2 and two symmetrically arranged arch foot side templates 10-1, wherein the top template 11 is arranged right above the bottom template 8, the internal mold system is arranged between the bottom template 8 and the top template 11, the two lateral templates 10-2 are respectively supported between the left side and the right side of the bottom template 8 and the left side and the right side of the top template 11, and the two arch foot side templates 10-1 are respectively supported between the front end and the rear end of the bottom template 8 and the front end and the rear end of the top template 11; the internal mold system comprises a plurality of internal mold groups which are distributed from left to right, the structures and the sizes of the plurality of internal mold groups are the same, and the number of the internal mold groups is the same as that of the box cavities; each inner die set comprises a plurality of inner die plates 9 which are arranged from front to back along the longitudinal bridge direction and are used for forming the box body unit 12;
two bottom separating pieces 18 are symmetrically arranged on the bottom template 8, each bottom separating piece 18 is uniformly distributed at the position of one middle section 3, and each bottom separating piece 18 is supported between the bottom template 8 and one inner template 9;
two top separating pieces 17 are symmetrically arranged on the internal mold system, each top separating piece 17 is uniformly distributed right above one bottom separating piece 18, and each top separating piece 17 is supported between a top mold plate 11 and one internal mold plate 9;
Each bottom partition 18 and the top partition 17 located right above the bottom partition are connected to form an assembled partition mechanism through a plurality of middle partitions, the number of the middle partitions is the same as that of partition walls 21, and each middle partition is connected between two adjacent left and right inner templates 9; the inner cavity of the forming template is divided into three forming cavities through the inner mould system and the two assembled separating mechanisms, and the three forming cavities are respectively a middle span forming cavity for forming the middle span 2 and two side span forming cavities symmetrically distributed on two sides of the middle span forming cavity and used for forming the side span 1.
In practical use, the bottom template 8 and the top template 11 are both plywood with the thickness of 15 mm.
In addition, for the convenience of processing, the inner mould systems of the lateral templates 10-2 and the arch springing side templates 10-1 are all plywood with the thickness of 15 mm.
When the concrete pouring structure is in actual use, the inner cavity of the forming template is divided into the midspan section forming cavity and the side span section forming cavities symmetrically distributed on two sides of the midspan section forming cavity through the arrangement of the assembled separating mechanism, so that the smooth pouring construction of concrete of the midspan section 2 and the side span section 1 can be effectively ensured. Thus, the overall height of the assembled divider is the same as the height of the cavity of the forming die plate, the height of the bottom divider 18 is the same as the thickness of the bottom plate 5, and the transverse width of the bottom divider 18 is the same as the width of the bottom plate 5; the height of the top partition 17 is the same as the thickness of the top plate 7, and the width of the top partition 17 in the transverse direction is the same as the width of the top plate 7. The longitudinal bridge length of the assembled divider is the same as the length of the intermediate section 3.
In this embodiment, the bottom spacer 18 and the top spacer 17 are each disposed along a transverse bridge.
In actual use, the top 17 and bottom 18 dividers are identical in construction and are both bridging dividers disposed between the two side forms 10-2. The transverse bridge direction separating piece can be a solid transverse bridge direction separating strip or consists of two separating plates distributed along the transverse bridge direction. The transverse bridge direction dividing strip is an arc dividing strip and the cross section of the transverse bridge direction dividing strip is rectangular.
Correspondingly, the middle partition piece is arranged along the transverse bridge direction, and can adopt a solid transverse bridge direction middle partition strip or be composed of two middle partition baffles arranged along the transverse bridge direction. The transverse bridge middle separation strip is an arc separation strip, and the cross section of the transverse bridge middle separation strip is rectangular.
In this embodiment, as shown in fig. 1, the bridging spacers are disposed between the front and rear adjacent inner templates 9. The bottom partition 18 is disposed below and between the front and rear adjacent two inner templates 9, the top partition 17 is disposed above and between the front and rear adjacent two inner templates 9, and each middle partition is connected between the front and rear adjacent two inner templates 9.
In actual construction, when the top 17 and bottom 18 dividers are the cross-bridge dividers, the length of the cross-bridge dividers is the same as the length of the intermediate section 3 at the location thereof, the height of the cross-bridge dividers as the top 17 is the same as the height of the bottom plate 5 at the location thereof, and the height of the cross-bridge dividers as the bottom 18 is the same as the height of the top plate 7 at the location thereof. When the middle partition adopts the transverse bridge to middle partition strip, the length of the transverse bridge to middle partition strip is the same as the length of the middle section 3 at the position where the transverse bridge to middle partition strip is located, and the cross section shape and the dimension of the transverse bridge to middle partition strip are the same as the cross section shape and the dimension of the partition wall 21 at the position where the transverse bridge to middle partition strip is located.
In order to facilitate the disassembly of the assembled separation mechanism and the reinforcement binding of the middle section 3, as shown in fig. 1, each of the top separation member 17 and the bottom separation member 18 is composed of two separation plates arranged along the transverse bridge direction, the separation plates are arranged perpendicular to the top template 11 at the position where the separation plates are arranged, the distance between the outer side walls of the two separation plates in the bottom separation member 18 is the same as the length of the middle section 3 at the position where the separation plates are arranged, and the height of the two separation plates in the bottom separation member 18 is the same as the height of the bottom plate 5 at the position where the separation plates are arranged; the distance between the outer side walls of two of the top dividers 17 is the same as the length of the intermediate section 3 at the location where it is located, and the height of two of the top dividers 17 is the same as the height of the top plate 7 at the location where it is located.
In this embodiment, the partition plate is a rectangular flat plate.
In this embodiment, the middle partition member is composed of two middle partition plates arranged along the transverse bridge direction, the distance between the outer side walls of the two middle partition plates is the same as the length of the middle section 3 at the position where the two middle partition plates are located, and the heights of the two middle partition plates are the same as the height of the partition wall 21 at the position where the two middle partition plates are arranged.
In this embodiment, the partition plates in the bottom partition member 18 are bottom partition plates, the partition plates in the top partition member 17 are top partition plates, each of the bottom partition plates and the top partition plate located right above the bottom partition plate are connected through a plurality of intermediate partition plates arranged on the same plane, and a plurality of intermediate partition plates and the bottom partition plates and the top partition plates connected with the intermediate partition plates are uniformly arranged on the same plane. And the plurality of middle separation baffles are connected with the bottom separation plate and the top separation plate which are connected with the middle separation baffles to form a transverse bridge assembled separation plate.
In actual use, the two ends of the constructed box arch ring along the longitudinal bridge are arch legs of the constructed box arch ring, and the arch legs are supported on the lower supporting structure 13.
In actual construction, the length of the intermediate section 3 is 100cm, wherein the length of the intermediate section 3 refers to the arc length on the arch axis of the constructed box arch.
For being convenient for demolish inner bolster 9, every all be provided with the cavity passageway that supplies the operating personnel to pass through between inner bolster 9 and the cope match-plate pattern 11, every all open on the inner bolster 9 and supply the lower installing port of cavity passageway installation, it supplies to open on the cope match-plate pattern 11 the last installing port of cavity passageway installation, cope match-plate pattern 11 passes through cavity passageway and the inside intercommunication of inner bolster 9.
In this embodiment, as shown in fig. 2, the cavity channel is arranged perpendicular to the top template 11 at the position where the cavity channel is located.
In this embodiment, the top template 11 and the bottom template 8 are arc-shaped molding templates formed by bending rectangular flat templates.
In actual use, the top template 11 is formed by bending a rectangular plane plate, and the traditional top template 11 comprises a top template body arranged on the top plate 7 and a baffle top template arranged above the baffle 6, when the top template 11 is constructed, as the constructed box arch ring is a thin-wall box arch ring, the thickness of the baffle 6 is small, the top template 11 needs to be spliced through the top template body and the baffle top template, the cutting and the splicing of the top template 11 are carried out for multiple times, the construction process is complex, meanwhile, construction joints in the construction process are increased, the top template 11 is formed by bending the rectangular plane plate, when the top template 11 is erected, the construction process can be reduced, the construction period can be shortened, meanwhile, the generation of the construction joints can be greatly reduced, and the integrity of the constructed box arch ring formed by construction is strong.
In actual construction, in order to accelerate the installation speed of the inner template 9, meanwhile, the difference of the specification and the size of a plurality of box units 12 is considered, the size of each box unit 12 is accurately controlled to meet the design requirement, and the inner template 9 is processed in a factory, so that the purposes of accelerating the construction process, accurately controlling the size of the box units 12, avoiding the waste of on-site processing and discharging and the like are achieved.
During actual construction, the arrangement of the cavity channel can ensure that operators pass smoothly, and is mainly used for pouring and vibrating the bottom plate 5 and dismantling the inner template 9 after concrete pouring is finished, and meanwhile quality control in the concrete pouring process is facilitated.
In this embodiment, one cavity channel is disposed between each of the inner mold plate 9 and the top mold plate 11.
In actual construction, the number of cavity channels and the arrangement positions of the cavity channels between each inner die plate 9 and the top die plate 11 can be respectively determined according to specific requirements.
As shown in fig. 5, 6 and 7, the inner mold plate 9 is an arc mold plate with a cavity inside, and the cross section of the inner mold plate is rectangular, the inner mold plate 9 comprises a lower plate 9-1, four side plates 9-2 respectively arranged above the peripheral sides of the lower plate 9-1, and an upper plate 9-3 arranged right above the side plates 9-2, the upper plate 9-3 and the lower plate 9-1 are arc plates formed by bending rectangular flat plates, and the four side plates 9-2 are supported between the upper plate 9-3 and the lower plate 9-1.
In this embodiment, the lower plate 9-1, the side plate 9-2 and the upper plate 9-3 are all plywood with a thickness of 15 mm.
As shown in fig. 6, the lower mounting opening is a first opening 14 arranged in the middle of the upper plate 9-3, the lower plate 9-1 is provided with a notch 15 for vibrating concrete, and the notch 15 is arranged along the length direction of the lower plate 9-1.
In this embodiment, the length of the first opening 14 is 75cm to 80cm, the width of the first opening 14 is 50cm to 75cm, the length of the notch 15 is 40cm to 50cm, and the width of the notch 15 is 15cm to 20cm.
As shown in fig. 7, the upper mounting opening is a second opening 20 formed in the top template 11, one first opening 14 is disposed under each second opening 20, a surrounding structure 19 is disposed between the first opening 14 and the second opening 20 located directly above the first opening 14, and the first opening 14, the second opening 20 and the surrounding structure 19 form a cavity channel.
One notch 15 is provided on the lower plate 9-1 of each of the case units 12, and the notch 15 is provided at the center of the lower plate 9-1 of each of the case units 12 in the longitudinal direction.
In this embodiment, the first opening 14 is rectangular, the length of the first opening 14 is 75cm to 80cm, and the width of the first opening 14 is 50cm to 75cm.
In actual use, the first opening 14 is rectangular or circular, and preferably the first opening 14 is rectangular.
During actual use, when the length and the width of the first opening 14 are too large, the pouring of concrete is affected, meanwhile, the workload of blocking the first opening 14 in the later period is increased, when the length and the width of the first opening 14 are too small, the passing of operators cannot be guaranteed, and the inner formwork 9 is not easy to dismantle and transport.
When in actual use, when the length and the width of the notch 15 are too large, concrete overflows when concrete is poured, the construction progress is affected, and when the length and the width of the notch 15 are too small, the vibration quality of the concrete is difficult to guarantee.
When in actual use, when the length and the width of the notch 15 are too large, concrete overflows when concrete is poured, the construction progress is affected, and when the length and the width of the notch 15 are too small, the vibration quality of the concrete is difficult to guarantee.
The four side plates 9-2 include two partition wall forming side plates arranged in the longitudinal direction and used for forming the partition wall 21, and two partition wall forming side plates arranged in the transverse direction and used for forming the partition wall 6.
In this embodiment, the thickness of each partition plate 6 is the same from top to bottom, and the height of the box cavity is the same as the height of the partition plate 6.
The construction method for carrying out one-step molding pouring on the segment of the box-type arch ring by using the molding template as shown in fig. 8 comprises the following steps:
step one, erecting a supporting system: erecting a supporting system 4 for supporting the forming template;
step two, supporting a molding template, which comprises the following steps:
step 201, supporting a bottom template and an assembled separation mechanism: a bottom template 8 is supported on the supporting system 4 erected in the first step, and the assembled separation mechanism, the arch springing side template 10-1 and the side template 10-2 are respectively supported on the bottom template 8;
step 202, respectively binding reinforcing steel bars on a bottom plate 5, a plurality of partition plates 6 and a plurality of partition walls of the constructed box-type arch ring on a bottom template 8 supported in step 201;
step 203, supporting an internal mold system: hoisting each inner template 9 in the inner mould system in place;
step 204, binding reinforcing steel bars on the top plate 7 of the constructed box arch ring on the inner mould system in step 203;
step 204, supporting a top template: erecting a top template 11 to obtain the built molding template, and obtaining the middle span molding cavity and the two side span molding cavities;
step three, concrete pouring, wherein the process is as follows:
Step 301, pouring middle span concrete: performing concrete pouring in the midspan section forming cavity in the step 204, and completing the concrete pouring process of the midspan section 2;
step 302, pouring side span concrete: synchronously pouring concrete in the two side span molding cavities in the step 204, and completing the concrete pouring process of the two side spans 1;
step 303, pouring middle section concrete: after the concreting in the step 301 and the step 302 are all final setting, dismantling the assembled separation mechanism, and concreting the middle section 3;
fourthly, forming the constructed arch ring: after the concrete poured in step 303 is finally set, the inner mold plate 9 in the inner mold system is removed, and the top mold plate 11, the bottom mold plate 8, the arch springside mold 10-1 and the side mold plate 10-2 are respectively removed.
When the bottom plate 5 and the partition plate 6 are bound by the steel bars in the actual construction, the steel bars of the bottom plate 5 and the partition plate 6 are bound by the construction method of sectioning and one-step forming in the steel bar engineering construction, and the steel bars of the top plate 7 are bound after the inner mould system is erected, hoisted, positioned and reinforced.
In actual construction, the inner die plate 9 of the inner die system in step 203 realizes industrial processing, and the installation speed of the inner die plate 9 is increased while the dimensional accuracy of the inner die plate 9 is ensured.
In actual construction, when the top formwork 11 in step 204 is erected, because the slope of the side span section 1 is larger, in order to prevent concrete from overflowing downwards in the concrete pouring process, the top formwork 11 is erected on the side span section 1, and the middle span section 2 is positioned at the position of the constructed box-type arch ring close to the vault, so that the linearity is gentle and the slope is smaller, the top formwork 11 is not required to be erected, the construction quality of the constructed box-type arch ring is ensured, and the construction procedure is reasonably simplified.
In actual construction, the side span 1, the middle span 2 and the middle section 3 are separated by the arrangement of the top separator 17 and the bottom separator 18, so that the side span 1, the middle span 2 and the middle section 3 are respectively poured when only concrete is poured.
In this embodiment, the assembly type separation mechanism is removed in step 303 and the inner mold plate 9 is removed in step four, both through the cavity channel.
During actual construction, when the concrete is poured in the third step, reasonable selection of the concrete pouring sequence of the constructed box arch ring directly influences the forming quality of the concrete of the constructed box arch ring and the stability of the supporting system 4 in the construction process, and the selection of symmetrically pouring the middle span 2 and then symmetrically pouring the side span 1 mainly has two reasons: on the one hand, because the inclination angle of the side span section 1 is larger, if the side span section 1 is poured first, the middle part of the supporting system 4 is horizontally extruded, so that the middle part of the supporting system 4 is easily deformed, and the middle part of the supporting system 4 is propped up; on the other hand, the middle support of the supporting system 4 is higher than the two sides of the supporting system 4, so that the deformation of the supporting system 4 is larger than that of the two sides, and in order to prevent the adverse effects such as concrete cracking after the casting is finished due to the deformation of the supporting system 4, the part with larger deformation of the supporting system 4 is cast firstly during the concrete casting construction.
In actual construction, when the midspan section is concreted in step 301, a plurality of concreting devices are adopted to symmetrically arrange the midspan section 2 for simultaneous continuous concreting.
In actual construction, when the concrete of the midspan section 2 is poured in step 301, after the symmetrical pouring is completed, the post-pouring belt 16 is constructed by adopting a conventional method, and the post-pouring belt 16 is arranged in the middle of the midspan section 2.
In actual construction, after the pouring of the concrete of the two side spans 1 is completed in step 302, the construction of the two post-cast strips 16 is performed by adopting a conventional method, and the two post-cast strips 16 are respectively arranged at the joints of the two side spans 1 and the arch springing.
In practical construction, in the traditional construction method, ring-separating pouring is adopted on the construction means of forming the thin-wall box-shaped arch ring, namely, the construction method of the first bottom plate 5, the second partition plate 6 and the second top plate 7 or the construction method of the first bottom plate 5, the partition plate 6 and the second top plate 7 is adopted, but when the construction method is adopted for construction, the following defects exist: the box body unit 12 can leave a large number of construction joints for the formed constructed box arch ring whether the box body unit is formed twice or three times, the construction difficulty for the construction joint treatment in the later stage is huge, and the unqualified construction joint treatment tends to cause great hidden trouble for the later stage stress of the arch bridge; the ring-division pouring of the constructed box-shaped arch ring is difficult to ensure the forming integrity of the constructed box-shaped arch ring, so that the deviation between the constructed box-shaped arch ring formed by in-situ actual pouring and a theoretical calculation model is larger, and the design effect is difficult to achieve; when the constructed box-type arch ring is poured in a split ring mode, the construction process is influenced by working procedures such as on-site processing templates and construction joint treatment, the construction period is long, the waste of personnel, materials and equipment is huge, and the economic benefit is poor.
During actual construction, the constructed box-type arch ring is divided into a middle span section 2 and two side span sections 1, and during actual construction, the middle span section 2 or the two side span sections 1 are molded and poured at one time, a separate sealing cover partition top template is not needed, the combined top template 11 is sealed at one time, the operation is simple and convenient, the materials are saved, meanwhile, the production of construction joints in the construction process is effectively reduced, the integrity of the constructed thin-wall box-type arch ring after construction molding is high, the concrete setting time is greatly reduced, the construction period is greatly shortened, and the manpower is saved.
In actual construction, since the lower portion of the top separator 17 is supported on the upper plate 9-3 and the upper portion of the bottom separator 18 is supported on the lower plate 9-1, when the top separator 17 and the bottom separator 18 are removed, the inner form 9 sandwiched between the top separator 17 and the bottom separator 18 is first removed, specifically, the upper plate 9-3, the lower plate 9-1, and the left and right side plates 9-2 of the inner form 9 are partially removed.
In the actual construction, in the first step, under the condition of meeting the stability and safety of the bracket, the load is calculated in different areas, so that the engineering quantity of the full framing is saved to the maximum extent, and the double saving of the material and the labor cost is achieved.
In actual construction, the process of controlling the elevation of the bottom die is required to consider the pre-camber of each part according to the design line type according to the requirements of a design drawing; after the construction of the constructed box-type arch ring is completed, the constructed box-type arch ring is elastically sunk due to the influence of the factors such as dead weight, temperature change, elastic compression of the constructed box-type arch ring, creep of concrete, pier displacement and the like, and the pre-camber must be considered in order to enable the arch axis of the constructed box-type arch ring to meet the design requirement.
In this embodiment, before the forming template in the second step is erected, the support system 4 in the first step is pre-pressed, and deformation of the support system 4 is monitored while pre-pressing;
the supporting system 4 is a full framing, the transverse distance and the longitudinal distance of the vertical rods of the full framing are 600-900 mm, and the step distance is 900-1200 mm.
And in actual construction, prepressing the full framing according to standard requirements, wherein the prepressing adopts 3-level prepressing according to standard requirements, and the elevation of the bottom die is adjusted according to observation data after the prepressing is finished.
In order to ensure the construction quality of the cast-in-place concrete engineering of the full framing of the steel pipe and ensure the construction safety of the engineering, according to the specification of JGJ/T194-2009 of the technical regulations for the prepressing of the full framing of the steel pipe, the full framing of the steel pipe is required to be prepressed according to the specification after being erected, and the next working procedure construction can be carried out after the prepressing is qualified.
And step four, after the inner template system is dismantled, carrying out reinforcement binding and concrete pouring construction on the area where the cavity channel is located in the constructed box-type arch ring.
In actual construction, in step 303, the reinforcing steel bar binding may be performed on the intermediate section 3 before the assembly type separation mechanism is removed, or the reinforcing steel bar binding may be performed on the intermediate section 3 after the assembly type separation mechanism is removed.
In this embodiment, the location of the assembled separating mechanism is the layout location of the partition 6.
Accordingly, when the assembled partition mechanism is removed in step 303, the two lateral-bridge assembled partition plates in the assembled partition mechanism are removed, and when any one of the lateral-bridge assembled partition plates is removed, an operator enters the inner die plate 9 connected to the lateral-bridge assembled partition plate through the cavity passage, and removes the lateral-bridge assembled partition plate connected thereto in the inner die plate 9.
In order to ensure the quality of the shaping of the intermediate section 3, the assembly-type separating mechanism should be dismantled in order to ensure that no inner formwork 9 between the two transverse bridge-wise assembly-type separating plates in the assembly-type separating mechanism is dismantled. This is mainly because, when the bridge-to-assembly-type partition plate is removed, damage to the inner form 9 connected thereto is unavoidable, but the inner form 9 located between two bridge-to-assembly-type partition plates in the assembly-type partition mechanism is not damaged, and at least the front and rear side plates 9-2 of the inner form 9 (i.e., the two side plates 9-2 arranged in the bridge-to-bridge direction) should be ensured not to be damaged. Thus, when the assembled divider mechanism is removed, the inner form 9 to which it is attached needs to be damaged as little as possible.
In this embodiment, when the assembled separation mechanism and the inner mold plate 9 are removed, the assembled separation mechanism and the small plates of the inner mold plate 9 are removed destructively, and the disassembled small plates are transported out from the cavity channel.
During actual construction, when the inner die plate 9 is removed in the fourth step, the inner die plate 9 is decomposed into small-size plates which can be transported from the cavity channel, so that the inner die plate 9 can be transported conveniently.
Therefore, when the middle span concrete casting is performed in step 301 and when the side span concrete casting is performed in step 302, the reinforcement and the concrete casting construction are not performed in the cavity channel.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides a box arch ring segmentation one-time molding is shaping template for construction which characterized in that: the constructed box-shaped arch ring comprises two side spans (1) which are symmetrically distributed and a middle span (2) which is connected between the two side spans (1), wherein the middle span (2) is connected with the two side spans (1) through a middle section (3); the constructed box-type arch ring comprises a bottom plate (5), a top plate (7) positioned right above the bottom plate (5) and two webs which are symmetrically distributed left and right, wherein the two webs are vertically distributed and are respectively distributed between the bottom plate (5) and the left and right sides of the top plate (7); the inner cavity of the constructed box-type arch ring is divided into a plurality of box cavities by a plurality of partition walls (21) which are arranged in parallel, the structures and the sizes of the partition walls (21) are the same, the partition walls are arranged from left to right along the transverse bridge direction, and each partition wall (21) is arranged along the longitudinal bridge direction; the structure and the size of the box cavities are the same, each box cavity is divided into a plurality of box units (12) by a plurality of partition boards (6) distributed along the transverse bridge direction, and the partition boards (6) are distributed from front to back along the longitudinal bridge direction; the partition wall (21) is vertically arranged, the box body unit (12) is an arc-shaped cavity, and the cross section of the box body unit is rectangular; the bottom plate (5), the top plate (7), the partition wall (21) and the partition plate (6) are all of reinforced concrete structures;
The forming template comprises a bottom template (8), a top template (11) positioned right above the bottom template (8), an internal mold system positioned between the bottom template (8) and the top template (11), two symmetrically arranged lateral templates (10-2) and two symmetrically arranged arch foot side templates (10-1), wherein the two lateral templates (10-2) are respectively supported between the left side and the right side of the bottom template (8) and the left side and the right side of the top template (11), and the two arch foot side templates (10-1) are respectively supported between the front end and the rear end of the bottom template (8) and the front end and the rear end of the top template (11); the internal mold system comprises a plurality of internal mold groups which are distributed from left to right, the structures and the sizes of the plurality of internal mold groups are the same, and the number of the internal mold groups is the same as that of the box cavities; each inner die set comprises a plurality of inner die plates (9) which are arranged from front to back along the longitudinal bridge direction and are used for forming the box body unit (12);
two bottom separating pieces (18) are symmetrically arranged on the bottom template (8), each bottom separating piece (18) is uniformly distributed at the position of one middle section (3), and each bottom separating piece (18) is supported between the bottom template (8) and one inner template (9);
Two top separating pieces (17) are symmetrically arranged on the internal mold system, each top separating piece (17) is uniformly distributed right above one bottom separating piece (18), and each top separating piece (17) is supported between a top mold plate (11) and one internal mold plate (9);
each bottom partition (18) and the top partition (17) right above the bottom partition are connected into an assembled partition mechanism through a plurality of middle partitions, the number of the middle partitions is the same as that of partition walls (21), and each middle partition is connected between two adjacent left and right inner templates (9); the inner cavity of the molding template is divided into three molding cavities by the inner mold system and two assembled separating mechanisms, and the three molding cavities are respectively a middle span molding cavity for molding a middle span (2) and two side span molding cavities symmetrically arranged at two sides of the middle span molding cavity and used for molding an opposite side span (1);
a cavity channel for operators to pass through is arranged between each inner template (9) and each top template (11), a lower mounting port for mounting the cavity channel is formed in each inner template (9), an upper mounting port for mounting the cavity channel is formed in each top template (11), and the top templates (11) are communicated with the inside of the inner templates (9) through the cavity channels;
The top template (11) and the bottom template (8) are arc-shaped forming templates formed by bending rectangular flat templates; each cavity channel is arranged between each inner template (9) and each top template (11);
the inner template (9) is an arc-shaped template with a cavity inside and is rectangular in cross section, the inner template (9) comprises a lower plate (9-1), four side plates (9-2) which are respectively arranged above the periphery side of the lower plate (9-1), and an upper plate (9-3) which is arranged right above the side plates (9-2), the upper plate (9-3) and the lower plate (9-1) are arc-shaped plates formed by bending rectangular flat plates, and the four side plates (9-2) are supported between the upper plate (9-3) and the lower plate (9-1);
the lower mounting opening is a first opening (14) arranged in the middle of the upper plate (9-3), a notch (15) for vibrating concrete is formed in the lower plate (9-1), and the notch (15) is arranged along the length direction of the lower plate (9-1);
the upper mounting opening is a second opening (20) formed in the top template (11), a first opening (14) is formed under each second opening (20), a surrounding structure (19) is arranged between the first opening (14) and the second opening (20) right above the first opening, and the first opening (14), the second opening (20) and the surrounding structure (19) form a cavity channel;
The rectangular shape of the first opening (14), the length of the first opening (14) is 75 cm-80 cm, the width of the first opening (14) is 50 cm-75 cm, the length of the notch (15) is 40 cm-50 cm, and the width of the notch (15) is 15 cm-20 cm;
the four side plates (9-2) comprise two partition wall forming side plates which are arranged along the longitudinal bridge direction and are used for forming partition walls (21) and two partition wall forming side plates which are arranged along the transverse bridge direction and are used for forming partition walls (6).
2. A molding die plate for one-time molding construction of a segment of a box arch ring according to claim 1, wherein: the bottom divider (18) and the top divider (17) are each disposed along a transverse bridge.
3. A molding die plate for one-time molding construction of a segment of a box arch ring according to claim 1, wherein: the thickness of each partition plate (6) is the same from top to bottom, and the height of the box cavity is the same as the height of each partition plate (6).
4. A construction method for one-step molding casting of a box arch ring segment by using the molding template as claimed in claim 1, characterized in that the construction method comprises the following steps:
step one, erecting a supporting system: setting up a supporting system (4) for supporting the forming template;
Step two, supporting a molding template, which comprises the following steps:
step 201, supporting a bottom template and an assembled separation mechanism: a bottom template (8) is supported on the supporting system (4) erected in the first step, and the assembled separation mechanism, the arch foot side template (10-1) and the side template (10-2) are respectively supported on the bottom template (8);
step 202, respectively binding reinforcing steel bars on a bottom plate (5), a plurality of partition plates (6) and a plurality of partition walls of the constructed box-type arch ring on a bottom template (8) supported in the step 201;
step 203, supporting an internal mold system: hoisting each inner template (9) in the inner mould system in place;
step 204, binding reinforcing steel bars on a top plate (7) of the constructed box arch ring on the inner mould system in step 203;
step 204, supporting a top template: supporting a top template (11) to obtain a formed template, and obtaining the middle span forming cavity and two side span forming cavities;
step three, concrete pouring, wherein the process is as follows:
step 301, pouring middle span concrete: performing concrete pouring in the midspan section forming cavity in the step 204, and completing the concrete pouring process of the midspan section (2);
Step 302, pouring side span concrete: synchronously pouring concrete in the two side span molding cavities in the step 204, and completing the concrete pouring process of the two side spans (1);
step 303, pouring middle section concrete: after the concreting in the step 301 and the step 302 are all final setting, dismantling the assembled separation mechanism, and concreting the middle section (3);
fourthly, forming the constructed arch ring: after the concrete poured in the step 303 is finally set, the inner template (9) in the inner mould system is removed, and the top template (11), the bottom template (8), the arch springing side template (10-1) and the side template (10-2) are respectively removed.
5. The construction method according to claim 4, wherein: pre-pressing the support system (4) in the first step before supporting the molding template in the second step, and monitoring deformation of the support system (4) while pre-pressing;
the supporting system (4) is a full framing, the transverse distance and the longitudinal distance of the vertical rods of the full framing are 600-900 mm, and the step distance is 900-1200 mm.
6. The construction method according to claim 4, wherein: in step 203, a cavity channel for operators to pass through is arranged between each inner template (9) and each top template (11), each inner template (9) is provided with a lower mounting port for mounting the cavity channel, each top template (11) is provided with an upper mounting port for mounting the cavity channel, and the top templates (11) are communicated with the inside of the inner templates (9) through the cavity channels;
The inner template (9) is an arc-shaped template with a cavity inside and is rectangular in cross section, the inner template (9) comprises a lower plate (9-1), four side plates (9-2) which are respectively arranged above the periphery side of the lower plate (9-1), and an upper plate (9-3) which is arranged right above the side plates (9-2), the upper plate (9-3) and the lower plate (9-1) are arc-shaped plates formed by bending rectangular flat plates, and the four side plates (9-2) are supported between the upper plate (9-3) and the lower plate (9-1);
the lower mounting opening is a first opening (14) arranged in the middle of the upper plate (9-3), a notch (15) for vibrating concrete is formed in the lower plate (9-1), and the notch (15) is arranged along the length direction of the lower plate (9-1);
the upper mounting opening is a second opening (20) formed in the top template (11), a first opening (14) is formed under each second opening (20), a surrounding structure (19) is arranged between the first opening (14) and the second opening (20) right above the first opening, and the first opening (14), the second opening (20) and the surrounding structure (19) form a cavity channel;
In the step 303, when the assembled separation mechanism is dismounted and when the inner template (9) is dismounted in the step four, the inner template is dismounted through the cavity channel;
and step four, after the inner template system is dismantled, carrying out reinforcement binding and concrete pouring construction on the area where the cavity channel is located in the constructed box-type arch ring.
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| CN201810340711.1A CN108286223B (en) | 2018-04-17 | 2018-04-17 | Forming template for sectional one-time forming construction of box-type arch ring and construction method |
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| CN108286223B true CN108286223B (en) | 2023-08-25 |
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| CN110130934B (en) * | 2019-05-22 | 2020-07-07 | 河南省交通规划设计研究院股份有限公司 | Construction method of urban tunnel branch junction with box-type top plate structure |
| CN110219232B (en) * | 2019-07-09 | 2020-12-04 | 中国十七冶集团有限公司 | Concrete pouring method for deck type arch bridge |
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