CN111188412B - Cast-in-place superposition construction method for thick and heavy concrete roof structure system - Google Patents
Cast-in-place superposition construction method for thick and heavy concrete roof structure system Download PDFInfo
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- CN111188412B CN111188412B CN202010026158.1A CN202010026158A CN111188412B CN 111188412 B CN111188412 B CN 111188412B CN 202010026158 A CN202010026158 A CN 202010026158A CN 111188412 B CN111188412 B CN 111188412B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/32—Arched structures; Vaulted structures; Folded structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
- E04B1/166—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material with curved surfaces, at least partially cast in situ in order to make a continuous concrete shell structure
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Abstract
The invention discloses a cast-in-place superposition construction method of a thick and heavy concrete roof slab structure system, which comprises the following steps of 1) pouring a bottom slab by adopting concrete; 2) installing a wall body reinforcement cage on the poured and formed bottom plate, pouring concrete into the wall body reinforcement cage from the bottom to the height required by the side wall after the wall body reinforcement cage is installed, and stopping pouring to finish the pouring of the side wall; 3) erecting a support frame and an arch template between the upper ends of the two poured side walls, installing arch plate steel bars, pouring concrete, and finishing the first node pouring; 4) continuously pouring concrete between the wall body steel reinforcement cage and the arch bar steel reinforcement to finish the second pouring of the hidden arch layer; 5) and (5) installing steel bars on the flat top layer, and pouring concrete to finish the third pouring of the flat top layer. According to the cast-in-place superposition construction method, the one-time pouring of the originally designed arch structure is changed into the batch pouring of the three parts of the node structure, the hidden arch structure and the flat plate structure, so that the structure flow construction can be realized, the construction load is effectively reduced, and the construction safety is ensured.
Description
Technical Field
The invention relates to an arch cast-in-place superposition method, in particular to a cast-in-place superposition construction method for an ultra-thick concrete structure system.
Background
The thickness of a top plate of the arched cast-in-place reinforced concrete structure reaches 2.5-3 m, the height of an arch top is high, the thickness of the cross section of an arched part along the vertical direction is larger, and the requirement is difficult to meet by adopting the traditional one-step integral cast-in-place concrete pouring process. Through calculation, if the main body structure construction is finished by one-time integral casting, even if heavy supports are adopted, the distance between the vertical supports is smaller than the operation space, and therefore the construction scheme for finishing the main body arch structure concrete by one-time casting is not feasible.
Disclosure of Invention
The invention aims to solve the technical problem that the existing one-time integral cast-in-place concrete pouring process is difficult to meet the requirement on the stability of an arch roof support system, and aims to provide a cast-in-place superposition construction method for a thick and heavy concrete roof structure system.
The invention is realized by the following technical scheme:
a cast-in-place superposition construction method for a thick and heavy concrete roof structure system comprises the following steps: 1) pouring the bottom plate by adopting concrete; 2) installing a wall body reinforcement cage on the poured and formed bottom plate, pouring concrete into the wall body reinforcement cage from the bottom to the height required by the side wall after the wall body reinforcement cage is installed, and stopping pouring to finish the pouring of the side wall; 3) erecting a support frame and an arch template between the two poured side walls, installing arch plate steel bars along the surface of the arch template, pouring concrete, wherein the pouring height is H1, and finishing the first node pouring, wherein H1 is smaller than the rise of the arch template; 4) after the first node pouring is finished to obtain strength, pouring concrete into the arch plate reinforcing steel bars to finish the pouring of the hidden arch ring, continuously pouring concrete between the wall body reinforcing cage and the hidden arch ring, wherein the pouring height is H2, and finishing the second pouring of the hidden arch layer, wherein H1+ H2 is higher than the rise of the arch template, the bottom surface of the hidden arch layer is arch-shaped, and the top surface of the hidden arch layer is flat; 5) and after the secondary pouring of the dark arch layer is finished to obtain the strength, the dark arch layer and the dark arch ring are used as a supporting stress system, the flat top layer steel bars are installed above the dark arch layer and the dark arch ring, and concrete is poured after the installation is finished to finish the third pouring of the flat top layer.
The cast-in-place superposition construction method changes one-time pouring of the originally designed arch structure into pouring in batches of three parts of nodes, a dark arch (a dark arch ring and a dark arch layer) and a flat top structure, can realize flow construction of the organization, effectively reduces construction load, ensures construction safety, provides a working surface for subsequent construction and saves construction period. The construction method of the invention comprises the steps of firstly pouring a bottom plate, then pouring a side wall, and finally pouring a top arch structure, namely dividing the whole structure into three large blocks to be respectively poured, wherein the bottom plate and the side wall are poured without supporting frames for bearing force, after the side wall is poured, the top arch structure is layered when being poured, namely, a first node pouring, a second dark arch layer pouring and a third flat top layer pouring are respectively carried out, wherein the first node pouring is firstly carried out on a part with larger thickness at the bottom of an arch, the part with larger thickness at the bottom of the arch is poured, the great difficulty caused by the selection of a supporting system is avoided, then the dark arch pouring is carried out, namely, a horizontal line with a certain distance to the highest point of an arch ring is poured, so that a stress system at the arch structure is formed, and finally, the flat top layer is poured above, the perfect flow construction of each section can be realized, and the difficulty of the binding of, meanwhile, the strain monitoring result of the supporting stress system rod piece also shows that the pouring method ensures the safe reliability of the frame body; through cast-in-place coincide construction, avoid whole roof to be the arc reinforcing bar under the prerequisite of keeping roof arch form atress characteristic for upper portion roof structure reinforcing bar arranges unanimously with bottom plate reinforcing bar arrangement, and it is horizontal flat vertical, and reinforcement is simple, and the work efficiency is high, has effectively accelerated the construction progress.
The arch bar reinforcing bar includes the horizontal atress reinforcing bar of arc bottom surface downside that sets up along arch template circumference outer wall, and the horizontal structure reinforcing bar of bottom surface upside has been set up in the outside of the horizontal atress reinforcing bar of bottom surface downside, is equipped with the stirrup between the horizontal structure reinforcing bar of bottom surface upside and the horizontal atress reinforcing bar of bottom surface downside, and the ligature has the vertical structure reinforcing bar of bottom surface downside along the setting of the vertical direction of arch template on the horizontal atress reinforcing bar of bottom surface downside, and the ligature has the vertical structure reinforcing bar of bottom surface upside along the setting of vertical direction on the horizontal.
The transverse stressed steel bar at the lower side of the bottom surface is used for resisting a negative bending moment borne by the main body structure and pulled at the upper part; the bottom surface upper side transverse structural steel bars, the bottom surface upper side longitudinal structural steel bars and the bottom surface lower side longitudinal structural steel bars have the functions of resisting concrete shrinkage and temperature stress, and are convenient to fix stirrups which are used for providing effective constraint for arc bottom surface lower side transverse stress steel bars along the span direction of the lower edge of the main body structure, and the vertical structural steel bars can enable upper and lower layers of concrete to form combined joint work; the reinforcing bars of the bottom surface lower side transverse stress reinforcing bars, the bottom surface upper side transverse structural reinforcing bars and the stirrups are reinforced according to the stress characteristics, so that the integral reinforcing bar ratio is reasonably optimized and reduced.
The flat top layer reinforcing steel bar comprises a top surface transverse stress reinforcing steel bar and a top surface longitudinal structure reinforcing steel bar which are horizontally arranged, and further comprises a vertical structure reinforcing steel bar which is vertically arranged and penetrates through the bottom surface of the flat top layer, the lower end of the vertical structure reinforcing steel bar is hooked and bound together with the bottom surface lower side longitudinal structure reinforcing steel bar and the bottom surface upper side longitudinal structure reinforcing steel bar, and the vertical structure reinforcing steel bar is hooked and bound together with the top surface longitudinal structure reinforcing steel bar. Because the main structure of the top plate adopts a construction scheme of secondary cast-in-place superposition, and a secondary concrete joint surface exists in the thickness range, the vertical structural ribs are arranged, and the capacity of resisting shearing force of the joint surface can be ensured.
The hoop distance between two adjacent stirrups is 200 mm.
The distance between the highest point of the arch ring of the dark arch layer and the top surface of the dark arch layer, namely the rise of the H1+ H2-arch template is 500mm, wherein H1 and H2 and the distance value between the highest point of the arch ring and the top surface of the dark arch layer are determined according to actual conditions.
The top surface transverse stress steel bar comprises a through steel bar and a support negative steel bar, wherein the length of the through steel bar penetrates through the whole transverse surface.
The nodes and the construction joints of the hidden arch layer are horizontally arranged; the construction joints of the nodes and the hidden arch rings are arranged perpendicular to the hidden arch rings, so that the stress of the hidden arch rings can vertically act on the nodes, and the shearing stress of the positions is reduced.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the cast-in-place superposition construction method for the thick and heavy concrete roof structure system, one-time pouring of an originally designed arch structure is changed into pouring in batches of the three parts of the node, the dark arch and the flat roof structure, so that the structure flow construction can be realized, the construction load is effectively reduced, the construction safety is ensured, a working surface is provided for subsequent construction, and the construction period is saved;
2. the cast-in-place superposition construction method for the thick and heavy concrete roof plate structure system can realize perfect flow construction of each section, greatly reduces the difficulty of binding reinforcing steel bars on site, and simultaneously displays the strain monitoring result of a supporting stress system to ensure the safe reliability of a frame body;
3. according to the cast-in-place superposition construction method for the thick and heavy concrete roof structure system, the initial casting thickness of the roof is reduced, and the whole roof is prevented from being arc-shaped steel bars through cast-in-place superposition construction, so that the arrangement of the steel bars of the roof structure at the upper part is consistent with that of the steel bars of the bottom plate, the steel bars are horizontally and vertically tied simply, the work efficiency is high, and the construction progress is effectively accelerated;
4. the cast-in-place superposition construction method for the thick and heavy concrete roof structure system reduces the initial casting thickness of the roof and the load of the support system, and can simplify the whole support system by utilizing the stress system formed by casting the roof structure first and then casting the roof structure.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of a casting structure according to the present invention;
fig. 2 is a schematic view of the reinforcement structure of the present invention.
Reference numbers and corresponding part names in the drawings:
1-bottom plate, 2-hidden arch ring, 3-side wall, 4-node, 5-hidden arch layer, 6-flat top layer, 7-bottom surface lower side transverse stress steel bar, 8-bottom surface upper side transverse structural steel bar, 9-hidden arch stirrup, 10-bottom surface lower side longitudinal structural steel bar, 11-bottom surface upper side longitudinal structural steel bar, 12-top surface transverse stress steel bar, 13-top surface longitudinal structural steel bar and 14-vertical structural steel bar.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, the cast-in-place superposition construction method for the thick and heavy concrete roof slab structure system comprises the following steps: 1) pouring the bottom plate 1 by adopting concrete; 2) installing a wall body reinforcement cage on the poured and formed bottom plate 1, pouring concrete into the wall body reinforcement cage from the bottom to the height required by the side wall 3 after the wall body reinforcement cage is installed, and stopping pouring to finish pouring of the side wall 3; 3) erecting a support frame and an arch template between the two poured side walls 3, installing arch plate steel bars along the surface of the arch template, pouring concrete, wherein the pouring height is H1, and finishing the first-time node 4 pouring, wherein H1 is smaller than the rise of the arch template; 4) after the first node pouring is finished to obtain strength, pouring concrete into the arch slab reinforcing steel bars, finishing the pouring of the hidden arch ring 2, continuously pouring concrete between the wall body reinforcing cage and the hidden arch ring 2 at a pouring height of H2, and finishing the second pouring of the hidden arch layer 5, wherein H1+ H2 is larger than the rise of the arch template, the bottom surface of the hidden arch layer 5 is arch-shaped, and the top surface of the hidden arch layer is flat; 5) and after the secondary pouring of the dark arch layer 5 is finished to obtain the strength, the dark arch layer and the dark arch ring are used as a supporting stress system, the flat top layer steel bars are arranged above the dark arch layer and the dark arch ring, and concrete is poured after the installation is finished to finish the third pouring of the flat top layer 6.
The cast-in-place superposition construction method changes one-time pouring of the originally designed arch structure into pouring in batches of three parts of nodes, a dark arch (a dark arch ring and a dark arch layer) and a flat top structure, can realize flow construction of the organization, effectively reduces construction load, ensures construction safety, provides a working surface for subsequent construction and saves construction period. The construction method of the invention comprises the steps of firstly pouring a bottom plate, then pouring a side wall, and finally pouring a top arch structure, namely dividing the whole structure into three large blocks to be respectively poured, wherein the bottom plate and the side wall are poured without supporting frames for bearing force, after the side wall is poured, the top arch structure is layered when being poured, namely, a first node pouring, a second dark arch layer pouring and a third flat top layer pouring are respectively carried out, wherein the first node pouring is firstly carried out on a part with larger thickness at the bottom of an arch, the part with larger thickness at the bottom of the arch is poured, the great difficulty caused by the selection of a supporting system is avoided, then the dark arch layer pouring is carried out, namely, a horizontal line with a certain distance to the highest point of an arch ring is poured, so that a stress system at the arch structure is formed, and finally, the flat top layer is poured above the arch structure, the perfect flow construction of each section can be realized, and the difficulty of, meanwhile, the strain monitoring result of the supporting stress system rod piece also shows that the pouring method ensures the safe reliability of the frame body; through cast-in-place coincide construction, avoid whole roof to be the arc reinforcing bar under the prerequisite of keeping roof arch form atress characteristic for upper portion roof structure reinforcing bar arranges unanimously with bottom plate reinforcing bar arrangement, and it is horizontal flat vertical, and reinforcement is simple, and the work efficiency is high, has effectively accelerated the construction progress.
Preferably, as shown in fig. 2, the arch bar reinforcing bar includes the horizontal atress reinforcing bar 7 of arc bottom surface downside that sets up along arch template circumference outer wall, the horizontal atress reinforcing bar 8 of bottom surface upside has been set up in the outside of the horizontal atress reinforcing bar 7 of bottom surface downside, be equipped with stirrup 9 between the horizontal atress reinforcing bar 7 of bottom surface upside and the horizontal atress reinforcing bar 7 of bottom surface downside, the ligature has the vertical structure reinforcing bar 10 of bottom surface downside along the setting of the vertical direction of arch template on the horizontal atress reinforcing bar 7 of bottom surface downside, the ligature has the vertical structure reinforcing bar 11 of bottom surface upside along the vertical direction setting on the horizontal structure reinforcing bar.
The transverse stressed steel bar at the lower side of the bottom surface is used for resisting a negative bending moment borne by the main body structure and pulled at the upper part; the bottom surface upper side transverse structural steel bars, the bottom surface upper side longitudinal structural steel bars and the bottom surface lower side longitudinal structural steel bars have the functions of resisting concrete shrinkage and temperature stress, and are convenient to fix stirrups which are used for providing effective constraint for arc bottom surface lower side transverse stress steel bars along the span direction of the lower edge of the main body structure, and the vertical structural steel bars can enable upper and lower layers of concrete to form combined joint work; the reinforcing bars of the bottom surface lower side transverse stress reinforcing bars, the bottom surface upper side transverse structural reinforcing bars and the stirrups are reinforced according to the stress characteristics, so that the integral reinforcing bar ratio is reasonably optimized and reduced.
Preferably, as shown in fig. 2, the top-flat reinforcing steel bars include top-side transverse stressed reinforcing steel bars 12 and top-side longitudinal structural reinforcing steel bars 13 which are horizontally arranged, and also include vertical structural reinforcing steel bars 14 which are vertically arranged and penetrate through the bottom surface of the top-flat layer, the lower ends of the vertical structural reinforcing steel bars 14 are hooked and bound with the bottom-side lower-side longitudinal structural reinforcing steel bars 10 and the bottom-side upper-side longitudinal structural reinforcing steel bars 11, and the vertical structural reinforcing steel bars 14 are hooked and bound with the top-side longitudinal structural reinforcing steel bars 13. Because the main structure of the top plate adopts a construction scheme of secondary cast-in-place superposition, and a secondary concrete joint surface exists in the thickness range, the vertical structural ribs are arranged, and the capacity of resisting shearing force of the joint surface can be ensured.
Preferably, the circumferential distance between two adjacent stirrups is 200 mm.
Preferably, the distance between the highest point of the arch ring of the dark arch layer and the top surface of the dark arch layer, namely the rise of the H1+ H2-arch template is 500mm, wherein H1 and H2 and the distance value between the highest point of the arch ring and the top surface of the dark arch layer are determined according to actual conditions.
Preferably, the top surface transverse stress steel bar comprises a penetrating steel bar and a support negative steel bar, wherein the length of the penetrating steel bar penetrates through the whole transverse surface.
Preferably, the nodes and the construction joints of the hidden arch layer are horizontally arranged; the construction joints of the nodes and the hidden arch rings are arranged perpendicular to the hidden arch rings, so that the stress of the hidden arch rings can vertically act on the nodes, and the shearing stress of the positions is reduced.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A cast-in-place superposition construction method for a thick and heavy concrete roof structure system is characterized by comprising the following steps: 1) pouring of the bottom plate (1) is carried out by adopting concrete; 2) installing a wall reinforcement cage on the poured and formed bottom plate (1), pouring concrete into the wall reinforcement cage from the bottom to the height required by the side wall (3) after the wall reinforcement cage is installed, and stopping pouring to complete pouring of the side wall (3); 3) erecting a support frame and an arch template between the two poured side walls (3), installing arch plate steel bars along the surface of the arch template, pouring concrete, wherein the pouring height is H1, and finishing the first-time node (4) pouring, wherein H1 is smaller than the rise of the arch template; 4) after the first node pouring is finished to obtain the strength, pouring concrete into the arch slab reinforcing steel bars to finish the pouring of the hidden arch ring (2), continuously pouring the concrete between the wall body reinforcing steel bar cage and the hidden arch ring (2), wherein the pouring height is H2, and finishing the second pouring of the hidden arch layer (5), wherein H1+ H2 is the rise height of the arch template, the bottom surface of the hidden arch layer (5) is arch-shaped, and the top surface of the hidden arch layer is flat; 5) and after the secondary pouring of the hidden arch layer (5) is finished to obtain the strength, the hidden arch layer and the hidden arch ring are used as a supporting stress system, the flat top layer steel bar is arranged above the supporting stress system, and concrete is poured after the installation is finished to finish the third pouring of the flat top layer (6).
2. The cast-in-place superposition construction method for the thick and heavy concrete roof structure system according to claim 1, characterized in that the arch slab steel bars comprise arc bottom surface lower side transverse stress steel bars (7) erected along the outer wall of the circumference of the arch-shaped formwork, bottom surface upper side transverse structural steel bars (8) are erected outside the bottom surface lower side transverse stress steel bars (7), stirrups (9) are arranged between the bottom surface upper side transverse structural steel bars (8) and the bottom surface lower side transverse stress steel bars (7), bottom surface lower side longitudinal structural steel bars (10) arranged along the longitudinal direction of the arch-shaped formwork are bound on the bottom surface lower side transverse stress steel bars (7), and bottom surface upper side longitudinal structural steel bars (11) arranged along the longitudinal direction are bound on the bottom surface upper side transverse structural steel bars (8).
3. The cast-in-place superposition construction method for the heavy and heavy concrete roof slab structure system according to claim 2, characterized in that the steel bars on the flat top layer comprise horizontally arranged top surface transverse stress steel bars (12) and top surface longitudinal construction steel bars (13), and further comprise vertically arranged vertical construction steel bars (14) penetrating through the bottom surface of the flat top layer, the lower ends of the vertical construction steel bars (14) are hooked and bound with the bottom surface lower side longitudinal construction steel bars (10) and the bottom surface upper side longitudinal construction steel bars (11), and the vertical construction steel bars (14) are hooked and bound with the top surface longitudinal construction steel bars (13).
4. The cast-in-place superposition construction method for the thick and heavy concrete roof slab structure system according to claim 1, characterized in that the circumferential distance between two adjacent stirrups (9) is 200 mm.
5. The cast-in-place superposition construction method for the heavy concrete roof structure system according to the claim 1, characterized in that the distance between the highest point of the arch ring in the dark arch layer (5) and the top surface of the dark arch layer (5), namely the rise of the H1+ H2-arch form is 500 mm.
6. The cast-in-place superposition construction method for the thick and heavy concrete roof slab structure system according to the claim 3, characterized in that the top surface transverse stress steel bars (12) comprise penetrating steel bars and support negative bars with the length penetrating through the whole transverse surface.
7. The cast-in-place superposition construction method of the thick and heavy concrete roof slab structure system according to the claim 1, characterized in that the construction joints of the nodes (4) and the hidden arch layer (6) are horizontally arranged; the construction joints of the nodes (4) and the hidden arch rings (2) are arranged perpendicular to the hidden arch rings (2).
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| CN112482856A (en) * | 2020-10-14 | 2021-03-12 | 上海建工二建集团有限公司 | Silo and construction method of silo top of circular arc body structure of silo |
| CN112983090B (en) * | 2021-03-08 | 2022-08-12 | 上海建工二建集团有限公司 | Silo top and construction method thereof |
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| JPH08239943A (en) * | 1995-03-03 | 1996-09-17 | Marusa Jutaku Kk | Arch-shaped prefabricated block and building using the block |
| CN108978712A (en) * | 2018-08-03 | 2018-12-11 | 上海市机械施工集团有限公司 | Arch top plate precast assembly structure and its construction method |
| CN109183848B (en) * | 2018-08-10 | 2019-06-21 | 广东省建工设计院有限公司 | A kind of Tunnel Design and building method |
| CN109252875B (en) * | 2018-12-03 | 2024-03-19 | 中铁三局集团有限公司 | Existing tunnel lining reinforcing structure and reinforcing method |
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