CN108240038B - Ultra-large plane concrete structure based on multistage grid type post-cast strip and construction method - Google Patents
Ultra-large plane concrete structure based on multistage grid type post-cast strip and construction method Download PDFInfo
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- CN108240038B CN108240038B CN201810213996.2A CN201810213996A CN108240038B CN 108240038 B CN108240038 B CN 108240038B CN 201810213996 A CN201810213996 A CN 201810213996A CN 108240038 B CN108240038 B CN 108240038B
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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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
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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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
- E04B1/68—Sealings of joints, e.g. expansion joints
- E04B1/6806—Waterstops
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- Civil Engineering (AREA)
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Abstract
The invention relates to the technical field of large-plane concrete structures, and discloses an oversized-plane concrete structure based on a multistage grid type post-cast strip and a construction method. The post-cast strip structure comprises a reinforced concrete structure and post-cast strips for construction, wherein the post-cast strips for construction are distributed in a crisscross manner and are uniformly spaced along the length or width direction of the concrete structure, the post-cast strips for construction are distributed in a crisscross manner and are uniformly spaced along the length or width direction of the concrete structure, and the distance between the post-cast strips for adjacent structures is 130-160m. The invention fully releases the shrinkage or expansion deformation of the concrete structure and effectively avoids the deformation crack of the oversized planar concrete structure.
Description
Technical Field
The invention relates to the technical field of large-plane concrete structures, in particular to an ultra-large-plane concrete structure based on a multi-stage grid type post-pouring strip and a construction method.
Background
The types of concrete cracks are mainly: sedimentation cracks, deformation cracks, composite cracks, expansion cracks, and kinetic inertia cracks. The occurrence rate of concrete deformation cracks in engineering reaches more than 80%, and the concrete deformation cracks are the main cause of the concrete cracks. The deformation cracks mainly occur due to the shrinkage deformation of the concrete, the change of the ambient temperature and the expansion deformation of the concrete, and the solution for generating the cracks due to the change of the temperature mainly comprises the step of controlling the curing temperature of the concrete; aiming at the cracks caused by the deformation of the concrete, the method mainly adopts anti-cracking measures, changes the construction mode, increases the consumption of the reinforcing steel bars or sets the post-pouring belt.
According to the current concrete design specification, in order to avoid shrinkage cracks, a concrete structure is required to be provided with a permanent expansion joint and a construction post-pouring belt, wherein the construction post-pouring belt is a temporary construction joint, is an improvement technology of the permanent expansion joint, and is an effective measure for preventing deformation cracks of an ultralong building. The steel bars at the post-cast strip of the conventional post-cast strip construction method are continuous, shrinkage deformation of the concrete structure cannot be released freely, and deformation cracks are unavoidable when the length or width of the concrete structure exceeds a certain size, so that the size of the concrete structure is still limited greatly.
Disclosure of Invention
The invention provides an oversized planar concrete structure based on a multi-stage grid type post-cast strip, which can fully release shrinkage or expansion deformation of a concrete structure and effectively avoid deformation cracks of the concrete structure, and a construction method.
The technical problems to be solved are as follows: the existing conventional post-cast strip construction can only improve concrete cracks caused by the deformation of concrete to a certain extent, and because the steel bars at the post-cast strip are uninterrupted, the shrinkage deformation of the concrete structure cannot be released freely, and the size of the concrete structure is greatly limited.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses an oversized planar concrete structure based on multistage grid type post-cast strips, which comprises a reinforced concrete structure and construction post-cast strips, wherein the construction post-cast strips are distributed in a grid shape in a crisscross manner, and each construction post-cast strip is uniformly arranged at intervals along the length or width direction of the reinforced concrete structure, and is characterized in that: the post-cast strip structure is characterized by further comprising post-cast strips of structures, wherein the post-cast strips of the structures are distributed in a net shape in a crisscross manner, each post-cast strip of the structures is uniformly arranged at intervals along the length or width direction of the reinforced concrete structure, and the distance between the post-cast strips of the adjacent structures is 130-160m.
The invention is based on the ultra-large planar concrete structure of the multistage grid type post-cast strip, further, the distance between the adjacent post-cast strips is 30-50m, and the width of the post-cast strip is 0.8-1m.
The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip is further characterized in that the width of the post-cast strip is 4-6m.
The ultra-large planar concrete structure based on the multistage grid type post-cast strip is further characterized in that the steel bars in the reinforced concrete structure on one side of the post-cast strip vertically penetrate through the post-cast strip to extend into the reinforced concrete structure on the other side, and the construction is continuous.
The invention is based on an oversized plane concrete structure of a multistage grid type post-cast strip, and further, a steel plate water stop and/or an externally attached water stop are arranged between vertical surfaces at two sides of the post-cast strip and an adjacent reinforced concrete structure.
The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip is characterized in that connecting steel bars are arranged in the post-cast strip in a layered mode, and two ends of the connecting steel bars are respectively connected with corresponding reserved joints in the reinforced concrete structures on two sides.
The invention is based on the ultra-large plane concrete structure of the multi-stage grid type post-cast strip, and further, the reserved joints corresponding to each layer of steel bars are respectively a short steel bar joint and a long steel bar joint, and the length of the short steel bar joint is not less than 500mm.
The invention is based on the oversized planar concrete structure of the multi-stage grid type post-cast strip, and further, the short steel bar joints and the long steel bar joints on each side of the reinforced concrete structure are staggered in the vertical direction, and two ends of each connecting steel bar are respectively connected with the short steel bar joints and the long steel bar joints.
The ultra-large plane concrete structure based on the multi-stage grid type post-cast strip is characterized in that steel plate water stops, externally attached water stops and/or centrally arranged water stops are arranged between the vertical surfaces of two sides of the post-cast strip and the adjacent reinforced concrete structure.
The invention discloses a construction method of an oversized planar concrete structure based on a multistage grid type post-cast strip, which comprises the following steps of:
binding reinforcing steel bars, and reserving construction positions of a construction post-pouring belt and a structure post-pouring belt;
step two (a), supporting pouring templates, and supporting templates on two corresponding sides of the construction post-pouring belt and the structural post-pouring belt;
pouring a reinforced concrete structure and maintaining;
fourthly, after the reinforced concrete structure is poured for at least 45 days, using a micro-expansion concrete pouring construction post-pouring belt which is one level higher than the original pouring concrete, performing construction sequence from bottom to top and from center to periphery, and then storing water for maintenance;
step five, connecting the steel bars in the post-pouring zone of the structure after the pouring of the reinforced concrete structure is completed for at least 90 days;
and step six, using a post-cast strip of the micro-expansion concrete casting structure which is one level higher than the original casting concrete, performing construction sequence from bottom to top and from center to periphery, and then storing water for maintenance.
Compared with the prior art, the ultra-large planar concrete structure based on the multi-stage grid type post-cast strip and the construction method thereof have the following beneficial effects:
the ultra-large planar concrete structure based on the multi-stage grid type post-cast strip is provided with the post-cast strips of the structure which are distributed in a net shape, deformation joints are not required, the post-cast strip of the ultra-large planar concrete structure is constructed in 2 steps, the first stage is the conventional post-cast strip for construction, the second stage is the post-cast strip for structure, the post-cast strip for construction is sealed after the reinforced concrete structure is constructed for no less than 90 days, the distance between the post-cast strips for adjacent structures is 130-180m, shrinkage deformation of the reinforced concrete structure can be fully released, shrinkage cracks of concrete are effectively reduced, and the deformation cracks of the ultra-large planar building structure are prevented.
The steel reinforcement framework in the post-pouring zone of the structure is disconnected, and the steel reinforcement framework in the post-pouring zone of the structure is formed by connecting the connecting steel bars with the reserved joints in the reinforced concrete structures at the two sides, so that the shrinkage deformation of the concrete construction section in the post-pouring zone of the structure can be released freely, and the generation of concrete cracks after the post-pouring zone is closed is controlled.
The construction method of the oversized planar concrete structure based on the multistage grid type post-cast strip is more flexible in construction sequence, does not need a 7-10 day time interval required by construction of adjacent concrete areas like a skip method, is used for separating the construction areas of the reinforced concrete structure formed by the post-cast strip, has no strict requirements on the construction sequence and the period requirements of the intervals of the adjacent construction areas, can be used for completing integral construction of the reinforced concrete structure more quickly, provides a working surface for running water construction of the structure, and improves construction efficiency.
The construction method of the invention is characterized in that the post-cast strips are arranged at intervals on the basis of the post-cast strips, and the construction method is suitable for the construction of large-size and oversized planar concrete structures, and has wider application range.
The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip and the construction method thereof are further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of an oversized planar concrete structure based on a multi-stage grid-type post-cast strip of the present invention;
FIG. 2 is a schematic cross-sectional view of a post-construction casting belt of a base plate;
fig. 3 is a schematic cross-sectional view of a structural post-cast strip of the base plate.
Reference numerals:
1-a reinforced concrete structure; 2-constructing a post-cast strip; 3-structural post-cast strip; 41-a steel plate water stop; 42-externally attached water stop; 43-attaching waterproof coiled materials; 5-short bar joints; 6-long steel bar joints; 7-connecting reinforcing steel bars; 8-middle water stop.
Detailed Description
As shown in fig. 1 to 3, the ultra-large planar concrete structure based on the multi-stage grid type post-cast strip of the present invention comprises a reinforced concrete structure 1, a construction post-cast strip 2 and a structural post-cast strip 3; the construction method is suitable for construction of various building structures such as a bottom plate structure, an outer wall structure, a floor structure beam, a base connecting beam and the like, and the bottom plate is taken as an example in the embodiment.
The construction post-cast strips 2 are distributed in a net shape in a crisscross manner, each construction post-cast strip 2 is uniformly arranged at intervals along the length or width direction of the reinforced concrete structure 1, the distance between adjacent construction post-cast strips 2 is 30-50m, and the width of the construction post-cast strip 2 is 0.8-1m; the steel bars in the reinforced concrete structure 1 on one side of the post-cast strip 2 pass through the post-cast strip 2 vertically and stretch into the reinforced concrete structure 1 on the other side, and the construction is continuous; a steel plate water stop 41 and/or an externally attached water stop 42 are arranged between the vertical surfaces at two sides of the post-cast strip 2 and the adjacent reinforced concrete structure 1, the width of the steel plate water stop 41 is not less than 30mm, and the distance between the steel plate water stop 41 and the bottom surface of the reinforced concrete structure 1 is not less than 1/2 of the thickness of the reinforced concrete structure 1; the external-attached water stop 42 is arranged at the bottom surface of the reinforced concrete structure 1, and an additional waterproof roll 43 can be additionally paved below the external-attached water stop 42, and the width of the additional waterproof roll 43 is not less than 1.5 times of the width of the post-cast strip 2.
The post-pouring strips 3 are distributed in a net shape in a crisscross manner, each post-pouring strip 3 is uniformly arranged at intervals along the length or width direction of the reinforced concrete structure 1, the distance between the adjacent post-pouring strips 3 is 130-180m, and the width of the post-pouring strips 3 is 4-6m; the connecting steel bars 7 in the post-pouring strip 3 are distributed in layers, two ends of the connecting steel bars are respectively connected with reserved joints in the reinforced concrete structures 1 at two sides, the reserved joints opposite to each layer of steel bars are respectively a short steel bar joint 5 and a long steel bar joint 6, the short steel bar joint 5 and the long steel bar joint 6 on each side of the reinforced concrete structure 1 are distributed in a staggered manner in the vertical direction, two ends of the connecting steel bars 7 are respectively connected with the short steel bar joint 5 and the long steel bar joint 6, the joints of the connecting steel bars 7 are connected according to 50% opening, a specific connection mode is or through sleeve straight thread connection, or welding or lap joint, the specific connection mode is selected in relation to the diameters of the steel bars and the lengths of the short steel bar joint 5 and the long steel bar joint 6, and the length of the short steel bar joint 5 is not less than 500mm; a steel plate water stop 41, an externally attached water stop 42 and/or a middle water stop 8 are arranged between the vertical surfaces at two sides of the post-pouring strip 3 and the adjacent reinforced concrete structure 1.
The invention discloses a construction method of an oversized planar concrete structure based on a multistage grid type post-cast strip, which comprises the following steps of:
step one, binding reinforcing steel bars according to construction design requirements, and reserving construction positions of a construction post-cast strip 2 and a structure post-cast strip 3;
step two (a), supporting pouring templates, and supporting templates on two corresponding sides of the construction post-pouring belt 2 and the structure post-pouring belt 3;
step two (b), respectively arranging waterproof structures below the connection part of the reserved construction post-cast strip 2 and the adjacent reinforced concrete structure 1 and below the connection part of the reserved structure post-cast strip 3 and the adjacent reinforced concrete structure 1;
the waterproof structure is a steel plate water stop 41 and/or an externally attached water stop 42, and is fixedly connected with the steel bars;
pouring a reinforced concrete structure 1 according to the sequence from bottom to top and from the center to the periphery, and performing concrete maintenance according to the requirements of the construction Specification of concrete structural engineering (GB 50666-2011);
fourthly, after the reinforced concrete structure 1 is poured for not less than 45 days, using a micro-expansion concrete pouring construction post-pouring belt 2 which is one level higher than the original pouring concrete, performing construction in sequence from bottom to top and from center to periphery, and then storing water for maintenance;
the concrete construction method for constructing the post-cast strip 2 comprises the following steps:
A. cleaning: cleaning a construction area of the post-cast strip 2, and chiseling the side elevation of the two adjacent reinforced concrete structures 1;
B. and (3) supporting a template: supporting construction templates of the construction post-pouring belt 2;
C. and (3) adjusting the steel bars: derusting, straightening and binding and fixing the steel bars of the construction post-cast strip 2;
D. pouring preparation: cleaning sundries in a template of the post-pouring strip 2 for construction, and spraying water to fully wet the construction;
E. pouring concrete: pouring concrete, and finishing one-time pouring;
F. curing: performing concrete curing according to the requirements of the concrete structure engineering construction Specification (GB 50666-2011), wherein the curing time is not less than 14 days, and the impervious concrete curing time is not less than 28 days;
step five, after the reinforced concrete structure 1 is poured for no less than 90 days, arranging connecting steel bars 7 in the post-pouring strip 3 of the structure, and fixedly connecting the connecting steel bars with reserved joints in the reinforced concrete structures 1 at two sides;
step six, using a post-cast strip 3 of a micro-expansion concrete casting structure which is one level higher than the original casting concrete, carrying out construction sequence from bottom to top and from center to periphery, and then carrying out water storage maintenance;
the concrete construction method of the post-pouring strip 3 comprises the following steps:
a. cleaning: cleaning a construction area of the post-pouring strip 3 of the structure, and chiseling the side elevation of the adjacent reinforced concrete structure 1 on two sides;
b. and (3) supporting a template: erecting a construction template of the post-pouring belt 3 with the structure;
c. and (3) adjusting the steel bars: derusting and straightening reserved joints of the steel bars of the post-pouring strip 3, arranging connecting steel bars 7, and binding and fixing;
d. pouring preparation: cleaning sundries in a template of the post-pouring belt 3 of the structure, and spraying water to fully wet the template;
e. pouring concrete: pouring concrete, and finishing one-time pouring;
f. curing: and (3) carrying out concrete curing according to the requirements of the concrete structure engineering construction Specification (GB 50666-2011), wherein the curing time is not less than 14 days, and the impervious concrete curing time is not less than 28 days.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. Ultra-large plane concrete structure based on multistage grid type post-cast strip, including reinforced concrete structure (1) and construction post-cast strip (2), construction post-cast strip (2) vertically and horizontally staggered are netted and distribute, and length or width direction, the even interval setting of every construction post-cast strip (2) along reinforced concrete structure (1), its characterized in that: the post-cast strip structure is characterized by further comprising post-cast strips (3) of structures, wherein the post-cast strips (3) of the structures are distributed in a crisscross manner, each post-cast strip (3) of the structures is uniformly arranged at intervals along the length or width direction of the reinforced concrete structure (1), and the distance between the post-cast strips (3) of the adjacent structures is 130-160m; the width of structure post-cast strip (3) is 4-6m, the inside layering of structure post-cast strip (3) is provided with connecting reinforcement (7), connecting reinforcement (7) both ends are connected with corresponding reserved joint in reinforced concrete structure (1) of both sides respectively, the corresponding reserved joint of every layer of reinforcing bar is short reinforcing bar joint (5) and long reinforcing bar joint (6) respectively, short reinforcing bar joint (5) and long reinforcing bar joint (6) on each side reinforced concrete structure (1) are crisscross the arranging in vertical direction, every connecting reinforcement (7) both ends are connected with short reinforcing bar joint (5) and long reinforcing bar joint (6) respectively.
2. The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip as set forth in claim 1, wherein: the distance between the adjacent construction post-cast strips (2) is 30-50m, and the width of the construction post-cast strips (2) is 0.8-1m.
3. The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip as set forth in claim 1, wherein: the steel bars in the reinforced concrete structure (1) on one side of the construction post-cast strip (2) vertically penetrate through the reinforced concrete structure (1) on the other side of the construction post-cast strip (2), and are continuous and uninterrupted.
4. The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip as set forth in claim 1, wherein: and a steel plate water stop (41) and/or an externally attached water stop (42) are arranged between the vertical surfaces at two sides of the construction post-pouring belt (2) and the adjacent reinforced concrete structure (1).
5. The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip as set forth in claim 1, wherein: the length of the short steel bar joint (5) is not less than 500mm.
6. The ultra-large planar concrete structure based on the multi-stage grid type post-cast strip as set forth in claim 1, wherein: a steel plate water stop (41), an externally attached water stop (42) and/or a centrally arranged water stop (8) are arranged between the two side vertical surfaces of the post-pouring strip (3) and the adjacent reinforced concrete structure (1).
7. The construction method of the ultra-large planar concrete structure based on the multi-stage grid type post-cast strip as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps: the method comprises the following steps:
binding reinforcing steel bars, and reserving construction positions of a construction post-pouring belt (2) and a structure post-pouring belt (3);
step two (a), supporting pouring templates, and supporting templates on two corresponding sides of the construction post-pouring belt (2) and the structure post-pouring belt (3);
pouring a reinforced concrete structure (1), and curing;
fourthly, after the reinforced concrete structure (1) is poured for at least 45 days, using a micro-expansion concrete pouring construction post-pouring belt (2) which is one level higher than the original pouring concrete, performing construction sequence from bottom to top and from center to periphery, and then storing water for maintenance;
step five, connecting the steel bars in the post-pouring strip (3) of the structure after the reinforced concrete structure (1) is poured for at least 90 days;
and step six, using a post-cast strip (3) of the micro-expansion concrete casting structure which is one level higher than the original casting concrete, performing construction sequence from bottom to top and from center to periphery, and then performing water storage maintenance.
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| CN109208907A (en) * | 2018-10-19 | 2019-01-15 | 中国十七冶集团有限公司 | High temperature and the temperature difference it is big under conditions of overlength reinforced concrete wall panel compartment construction method |
| CN111206746B (en) * | 2020-01-09 | 2021-05-11 | 海达建设集团有限公司 | Construction method of large-area terrace |
| CN111648411B (en) * | 2020-05-06 | 2023-06-09 | 上海建工二建集团有限公司 | Down-turned post-pouring belt support changing structure, construction method and post-pouring belt construction method |
| CN112031035B (en) * | 2020-08-27 | 2022-06-14 | 北京市第三建筑工程有限公司 | Entrance and exit indwelling structure of foundation slab post-cast strip with thickness greater than one meter and construction method |
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