CN115434330A - Sectional type support replacing construction method - Google Patents
Sectional type support replacing construction method Download PDFInfo
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- CN115434330A CN115434330A CN202210446928.7A CN202210446928A CN115434330A CN 115434330 A CN115434330 A CN 115434330A CN 202210446928 A CN202210446928 A CN 202210446928A CN 115434330 A CN115434330 A CN 115434330A
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- cast strip
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention provides a sectional type support changing construction method, which belongs to the technical field of building construction and specifically comprises the following steps: s1: carrying out preparation work; s2: processing post-cast strip steel force transmission components corresponding to the plate thickness and the area in batches according to the deepened node diagram; s3: the material enters a field, and the material, thickness, size and processing quality of the component are subjected to incoming field acceptance according to a deepening map; s4: transporting the components to a construction area, and arranging the components at intervals according to a drawing; s5: welding a steel bar fixing support, and filling a concrete block at the bottom of the support; s6: after concrete pouring and formwork dismantling of wall bodies at two side ramps and hole openings reach the age, oppositely supporting steel members, namely steel pipes, are installed according to the original modulus, and the steel members adopt
The steel pipe pair brace with the wall thickness of 12mm solves the problems that in the inner support dismantling process, the back-topping construction time of a post-cast strip and a ramp hole is long, pouring is difficult, and manpower is consumed, and the ramp and the hole pair brace achieve the effect that different modules can be formed in a dismountable mode for recycling after the bracing is completed.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a sectional type support changing construction method.
Background
The foundation pit is a space below the ground excavated for constructing a foundation and a basement of a building (including a structure). The foundation pit belongs to temporary engineering, and aims to provide a space, so that the building operation of the foundation can be carried out according to the position appointed by the design, in the excavation process of the foundation pit, an inner supporting beam of the foundation pit plays a supporting role, and after the excavation of the foundation pit is finished, when a building main body is constructed, the inner supporting beam needs to be dismantled.
The traditional inner support removal needs to be performed after the concrete of a post-cast strip is sealed, and the support removal can be performed after the strength reaches the designed strength, or the support removal can be performed after the concrete is sealed in sections and reaches the designed strength; structural hole parts of non-post-cast strip areas, such as automobile ramps, yard cavities and the like. The method is characterized in that reinforced concrete is adopted to pour the supporting beam, and cutting and dismantling or chiseling removal are carried out after the supporting is dismantled. This kind of interior support mode of demolising efficiency is lower, and post-cast strip part is poured and ramp, entrance to a cave department reinforced concrete are pour the degree of difficulty to the bracing beam big, have increased the potential safety hazard simultaneously.
Disclosure of Invention
The invention aims to provide a sectional type support changing construction method, which specifically comprises the following steps:
s1: carrying out preparation work;
s2: processing post-cast strip steel force transmission components corresponding to the plate thickness and the area in batches according to the deepened node diagram;
s3: the material enters a field, and the material, thickness, size and processing quality of the component are checked and accepted according to a deepening drawing;
s4: transporting the components to a construction area, and setting the interval arrangement according to a drawing;
s5: welding a steel bar fixing support, and filling a concrete block at the bottom of the support; the ramp and the hole pair support achieve the effect of disassembling and forming different modules for recycling after the support is finished, the breaking of concrete amount is reduced, and the quantity of field operation environment pollution sources is reduced;
s6: after concrete pouring of walls at the ramps on the two sides and the opening and dismantling of the templates, the walls reach the age, steel supporting members, namely steel pipes, are installed according to the original modulus, and the steel members adopt
The steel pipes with 12mm wall thickness are oppositely supported, two ends of the steel pipes are welded with 750X 12 thick steel plates, and the steel plates are connected with the wall bodies (beams and columns) at two sides by adopting
Expansion bolt fixing (four points on one surface);
s7: after the support in the subareas is removed, the slope removing way and the hole steel transfer beam can be removed and used for the next area;
the steel member is used for supporting the internal support of the beam to remove the ramp and the opening to transmit force, the reinforced concrete is replaced to support the top, the problem that the inserted bars are reserved during early-stage external wall construction or the support frame needs to be erected again to pour the concrete of the supporting beam is solved, the steel member can be used for supporting the beam to remove other parts needing to be supported and reinforced after the internal support is removed, later-stage concrete removal amount is reduced, and money, trouble and labor are saved.
Further, the method comprises the following steps of;
the preparation work in the step S1 comprises the following steps:
s11: checking according to the plate thickness condition of the arrangement position and related stress, and selecting the section size and the arrangement interval of the component;
s12: increasing the inflection point of the water stop steel plate according to the positions of the component and the water stop steel plate;
s13: and calculating the minimum length and the number of the steel structure counter stays at the opening and the ramp opening in a partitioning manner, and reasonably arranging the processing length and the processing number.
Further, the method comprises the following steps of;
and the post-cast strip steel force transmission component in the step S2 comprises a bottom plate post-cast strip support changing mechanism, a second-layer post-cast strip support changing mechanism and an underground first-layer post-cast strip support changing mechanism.
Further, the method comprises the following steps of;
in the bottom plate post-cast strip support changing mechanism, H400 multiplied by 13 multiplied by 12 section steel is adopted for bottom plate post-cast strip support changing, the distance is 2.5, Q235B grade steel is adopted as steel, and E43 is adopted as a welding rod.
Further, the method comprises the following steps of;
and the casting strip support changing steel in the underground two-layer post-casting strip support changing mechanism and the underground one-layer post-casting strip support changing mechanism adopts Q345B-grade steel, and welding rods adopt E50.
Further, the method comprises the following steps of;
and in the step S3, structural floor slabs with the first thickness are formed on two sides of the post-cast strip area, and extend for a certain preset distance along the boundary of the post-cast strip area in the direction away from the post-cast strip area, so that the structural floor slabs on the two sides are turned downwards and are provided with reinforcing steel bars penetrating through the lower part of the post-cast strip area to form the reinforced concrete edge beam with the thickness.
Further, the method comprises the following steps of;
the structural floor includes concrete and a first reinforcement cage disposed laterally within the concrete.
Further, the method comprises the following steps of;
the thickness of the reinforced concrete boundary beam is larger than or equal to that of the structural floor slab.
Further, the method comprises the following steps of;
and (3) removing the template after the concrete curing of the structural floor reaches the design requirement, removing the next temporary support, and arranging a heat preservation layer and a waterproof layer on the side wall of the outer wall of the basement structure.
Further, the method comprises the following steps of;
the temporary support is arranged in the ultra-large deep foundation pit, and the temporary support and the foundation pit support structure form a stable foundation pit temporary support system.
The invention is realized in the following way:
ramp, entrance to a cave department are demolishd to the internal support of braced beam by the adoption steel member and carry out the transmission of power of opposite vertex, replace reinforced concrete and support the opposite vertex, reserve the dowel or need set up the support frame again and pour to the braced beam concrete when solving outer wall construction earlier stage, and treat that the internal support demolishs to accomplish the back can demolish the steel member to the braced beam and be used for other needs to carry out to propping reinforced (rfd) position, reduce later stage concrete demolishs the volume, and is laborsaving in money saving.
The invention has the beneficial effects that: compared with the traditional reinforced concrete opposite-bracing construction method, the method is more convenient, safer and more economical; the problem of support demolish in-process post-cast strip and ramp entrance to a cave back the construction time long, pour difficult, consume artifical is solved, ramp and entrance to a cave have reached to support and have accomplished the effect that the back can dismantle the different modulus reuse of constitution, have reduced the chisel of concrete volume, have reduced site operation environmental pollution source quantity, have promoted workman's operating efficiency and operation safety assurance. The purpose of combining economy, benefit and environmental protection is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a solid diagram of the overall flow structure of a sectional type support-changing construction method according to an embodiment of the present invention;
FIG. 2 is a detailed view of the support change of the bottom plate post-cast strip in the sectional support change construction method according to the embodiment of the invention;
FIG. 3 is a detailed view of the support change of the underground second-layer post-cast strip of the sectional type support change construction method provided by the embodiment of the invention;
FIG. 4 is a detailed supporting replacing diagram of the post-cast strip in the next floor of the sectional supporting replacing construction method provided by the embodiment of the invention;
fig. 5 is a structural diagram of a sectional type support changing construction method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the present product is conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "suspended" and the like do not imply that the components are absolutely horizontal or suspended, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Example (b):
the embodiment provides a sectional support changing construction method, which specifically includes the following steps, as shown in fig. 1-5:
s1: carrying out preparation work;
s2: processing post-cast strip steel force transmission components corresponding to the plate thickness and the area in batches according to the deepened node diagram;
s3: the material enters a field, and the material, thickness, size and processing quality of the component are checked and accepted according to a deepening drawing;
s4: transporting the components to a construction area, and arranging the components at intervals according to a drawing;
s5: welding a steel bar fixing support, and filling a concrete block at the bottom of the support;
s6: after concrete pouring and formwork dismantling of wall bodies at two side ramps and hole openings reach the age, oppositely supporting steel members, namely steel pipes, are installed according to the original modulus, and the steel members adopt
The steel pipes with 12mm wall thickness are oppositely supported, two ends of the steel pipes are welded with 750X 12 thick steel plates, and the steel plates are connected with the wall bodies (beams and columns) at two sides by adopting
Expansion bolt fixing (four points on one surface);
s7: after the support in the subareas is removed, the slope removing way and the hole steel transfer beam can be removed and used for the next area; the inner support is dismantled by partitions, after the partition dismantling plan for the inner support in the basement is completed, the minimum length of the support is realized by processing ramps and steel members at the entrance to a cave according to conventional modulus, and the rest scattered modulus processing small block members can improve the turnover utilization rate of the support by the steel members, thereby further reducing the cost.
The steel member is used for supporting the internal support of the beam to remove the ramp and the opening to transmit force, the reinforced concrete is replaced to support the top, the problem that the inserted bars are reserved during early-stage external wall construction or the support frame needs to be erected again to pour the concrete of the supporting beam is solved, the steel member can be used for supporting the beam to remove other parts needing to be supported and reinforced after the internal support is removed, later-stage concrete removal amount is reduced, and money, trouble and labor are saved.
Referring to fig. 1, the preparation in step S1 includes the following steps:
s11: checking according to the plate thickness condition of the arrangement position and related stress, and selecting the section size and the arrangement interval of the component;
s12: the bottom plate needs to consider the placing position of the component and the management of the water stop steel plate, and the inflection point of the water stop steel plate is increased when necessary;
s13: and calculating the minimum length and the number of the steel structure counter stays at the opening and the ramp opening in a partitioning manner, and reasonably arranging the processing length and the processing number.
Specifically, the post-cast strip steel force transmission component in the step S2 comprises a bottom plate post-cast strip support changing mechanism, a second-layer post-cast strip support changing mechanism and an underground first-layer post-cast strip support changing mechanism.
Referring to fig. 2, further, in the supporting mechanism for the bottom plate post-cast strip, H400 × 400 × 13 × 12 steel is used for supporting the bottom plate post-cast strip, the distance is 2.5, Q235B grade steel is used as steel material, and E43 is used as welding rod.
Referring to fig. 3, further, the casting strip support changing steel in the underground second-layer post-casting strip support changing mechanism and the underground first-layer post-casting strip support changing mechanism adopts Q345B-grade steel, and the welding rod adopts E50; the height of the welding seam is 8m except the special indication, the periphery is fully welded, the non-man defense area is arranged at the position of the primary and secondary beams of the structure, and the man defense area is arranged on the floor slab.
Referring to fig. 4, further, in the step S3, structural floor slabs with a first thickness are formed on two sides of the post-cast strip region, and extend a predetermined distance in a direction away from the post-cast strip region along a boundary of the post-cast strip region, so that the structural floor slabs on the two sides are turned down and are configured with reinforcing steel bars penetrating through the lower portion of the post-cast strip region, thereby forming a reinforced concrete edge beam with a thickness.
Further, the structural floor includes concrete and a first reinforcement cage disposed laterally within the concrete.
Further, the thickness of the reinforced concrete boundary beam is larger than or equal to that of the structural floor slab.
Further, after the concrete curing of the structural floor slab reaches the design requirement, the template is dismantled, meanwhile, the next temporary support is dismantled, and an insulating layer and a waterproof layer are arranged on the side wall of the outer wall of the basement structure;
the heat preservation and the waterproof layer can both effectually protect the foundation ditch, prevent effectively that the foundation ditch is impaired, improve the construction effect of foundation ditch.
Further, the temporary support is arranged in the ultra-large deep foundation pit, and the temporary support and the foundation pit support structure form a stable foundation pit temporary support system;
the temporary support forms a stable foundation pit temporary support system, so that the foundation pit can be effectively prevented from being damaged, and the subsequent foundation pit support replacement construction operation is influenced.
When the basement bottom plate and the floor are constructed, the cast-in post-cast strip part needs to be disconnected in advance, the concrete with the post-cast strip section and the closed concrete can be constructed after most of the thermal stress of the concrete on the two sides is released, in order to avoid the trouble that the concrete with the post-cast strip needs to be cast in sections before the follow-up inner support is dismantled, the post-cast strip concrete cast in sections is optimized into steel structure section pre-embedding according to the thickness of the bottom plate and the floor, and the difficult problem of the casting of the closed concrete of the pre-cast post-cast strip is solved. The steel member is adopted to support the internal support of the supporting beam to remove the ramp and the opening to transmit force, the reinforced concrete is replaced to support the top, the problem that the steel member is used for supporting the supporting beam to remove other parts needing to be supported and reinforced after the internal support removal is completed by reserving the inserted bars or needing to erect the support frame again during the early-stage external wall construction is solved, the later-stage concrete removal amount is reduced, and money, trouble and labor are saved. The inner support is dismantled by partitions, after the partition dismantling plan of the inner support in the basement is completed, the ramp and the portal steel member are machined according to the conventional modulus to support the minimum length, and the rest scattered modulus is machined into small blocks, so that the turnover utilization rate of the steel member to the support can be improved, and the cost is further reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sectional type support changing construction method is characterized by comprising the following steps:
s1: carrying out preparation work;
s2: processing post-cast strip steel force transmission components corresponding to the plate thickness and the area in batches according to the deepened node diagram;
s3: the material enters a field, and the material, thickness, size and processing quality of the component are checked and accepted according to a deepening drawing;
s4: transporting the components to a construction area, and setting the interval arrangement according to a drawing;
s5: welding a steel bar fixing support, and filling a concrete block at the bottom of the support;
s6: after concrete pouring and formwork dismantling of wall bodies at two side ramps and hole openings reach the age, oppositely supporting steel members, namely steel pipes, are installed according to the original modulus, and the steel members adopt
The steel pipes with 12mm wall thickness are oppositely supported, 750-12 thick steel plates are welded at two ends, and the steel plates are connected with the wall bodies at two sides by adopting
Fixing an expansion bolt;
s7: after the inner supports in the subareas are removed, the slope removing way and the steel force transfer beam at the opening can be removed and used for the next area.
2. The segmental support-changing construction method according to claim 1, wherein the preparation work in the step S1 comprises the following steps:
s11: checking according to the plate thickness condition of the arrangement position and related stress, and selecting the section size and the arrangement interval of the component;
s12: according to the positions of the member and the water stop steel plate, increasing the inflection point of the water stop steel plate;
s13: and calculating the minimum length and the number of the steel structure opposite supports of the hole and the ramp mouth in a partitioning manner, and reasonably arranging the processing length and the number.
3. The segmented support-changing construction method according to claim 1, wherein the post-cast strip steel force transmission component in the step S2 comprises a bottom plate post-cast strip support-changing mechanism, a second-layer post-cast strip support-changing mechanism and a next-layer post-cast strip support-changing mechanism.
4. The sectional type support-changing construction method according to claim 3, wherein in the support-changing mechanism for the bottom plate post-cast strip, H400X 13X 12 section steel is adopted for the bottom plate post-cast strip support-changing mechanism, the spacing is 2.5, Q235B grade steel is adopted for the steel material, and an E43 welding rod is adopted for the welding rod.
5. The sectional type support changing construction method according to claim 4, wherein the casting band support changing steel materials in the underground second-layer post-casting band support changing mechanism and the underground first-layer post-casting band support changing mechanism are both Q345B grade steel, and welding rods are E50.
6. The sectional type support-changing construction method according to claim 3, wherein in the step S3, structural floor slabs with the first thickness are formed on two sides of the post-cast strip area, and the structural floor slabs on the two sides are turned downwards and are provided with reinforcing steel bars penetrating through the lower portion of the post-cast strip area to form reinforced concrete side beams with the first thickness by extending a certain preset distance in the direction away from the post-cast strip area along the boundary of the post-cast strip area.
7. The segmented shoe replacement construction method according to claim 6, wherein the structural floor comprises concrete and the first reinforcement cage is disposed laterally within the concrete.
8. The segmented type support-changing construction method according to claim 1, wherein the thickness of the reinforced concrete boundary beam is greater than or equal to that of the structural floor slab.
9. The sectional type support-changing construction method according to claim 2, wherein the formwork is removed after concrete curing of the structural floor slab meets design requirements, a next temporary support is removed at the same time, and an insulating layer and a waterproof layer are arranged on the side wall of the outer wall of the basement structure.
10. The segmented support-changing construction method according to claim 9, wherein the temporary support is arranged in an oversized deep foundation pit, and the temporary support and a foundation pit enclosure form a stable foundation pit temporary support system.
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| CN202210446928.7A CN115434330A (en) | 2022-04-26 | 2022-04-26 | Sectional type support replacing construction method |
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| CN202210446928.7A CN115434330A (en) | 2022-04-26 | 2022-04-26 | Sectional type support replacing construction method |
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| CN103015432A (en) * | 2012-12-07 | 2013-04-03 | 天津住宅集团建设工程总承包有限公司 | Construction method for changing steel pipe supports of ramp foundation pit |
| CN110185043A (en) * | 2019-06-14 | 2019-08-30 | 中国十七冶集团有限公司 | A kind of deep foundation pit support inner support support replacement method |
| CN111074905A (en) * | 2020-01-10 | 2020-04-28 | 广西建工集团联合建设有限公司 | Early-dismantling structure and construction method for bottom layer support beam of inner support system of deep foundation pit |
| CN111456025A (en) * | 2020-04-09 | 2020-07-28 | 中建八局天津建设工程有限公司 | Combined support replacing and dismantling construction method for ultra-deep foundation pit |
| CN111648411A (en) * | 2020-05-06 | 2020-09-11 | 上海建工二建集团有限公司 | Downward-turning type post-cast strip support replacing structure, construction method and post-cast strip construction method |
| WO2021228189A1 (en) * | 2020-05-15 | 2021-11-18 | 中建三局第三建设工程有限责任公司 | Reusable post-cast strip support replacement force transfer device and construction method therefor |
-
2022
- 2022-04-26 CN CN202210446928.7A patent/CN115434330A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103015432A (en) * | 2012-12-07 | 2013-04-03 | 天津住宅集团建设工程总承包有限公司 | Construction method for changing steel pipe supports of ramp foundation pit |
| CN110185043A (en) * | 2019-06-14 | 2019-08-30 | 中国十七冶集团有限公司 | A kind of deep foundation pit support inner support support replacement method |
| CN111074905A (en) * | 2020-01-10 | 2020-04-28 | 广西建工集团联合建设有限公司 | Early-dismantling structure and construction method for bottom layer support beam of inner support system of deep foundation pit |
| CN111456025A (en) * | 2020-04-09 | 2020-07-28 | 中建八局天津建设工程有限公司 | Combined support replacing and dismantling construction method for ultra-deep foundation pit |
| CN111648411A (en) * | 2020-05-06 | 2020-09-11 | 上海建工二建集团有限公司 | Downward-turning type post-cast strip support replacing structure, construction method and post-cast strip construction method |
| WO2021228189A1 (en) * | 2020-05-15 | 2021-11-18 | 中建三局第三建设工程有限责任公司 | Reusable post-cast strip support replacement force transfer device and construction method therefor |
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