CN115233720A - Super-thick radiation-proof raft plate L-shaped construction joint structure and construction method - Google Patents
Super-thick radiation-proof raft plate L-shaped construction joint structure and construction method Download PDFInfo
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- 238000009415 formwork Methods 0.000 claims description 85
- 230000003014 reinforcing effect Effects 0.000 claims description 22
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Abstract
The invention discloses an L-shaped construction joint structure of an ultra-thick radiation-proof raft and a construction method, relating to the technical field of radiation-proof raft structures, and adopting the technical scheme that the L-shaped construction joint structure comprises two construction areas which are divided according to the construction of the raft, wherein each construction area comprises a construction area I and a construction area II; the first construction area comprises a first area raft plate bottom steel bar, a first area section steel support, a first area raft plate top steel bar and a raft plate top steel bar sling bar; the second raft in the construction area is divided into an upper pouring section and a lower pouring section along the height. The invention has the beneficial effects that: this patent research and development a new super thick radiation protection raft pouring mode sets up at construction area one and two hookup locations in construction area and hangs mould system and hang mould braced system, and this method can effectively reduce the heat of hydration of super thick raft, simultaneously with the raft in the subregion, through setting up L type construction joint, can avoid the current back casting area of adopting or jump storehouse to pour the through crack that produces, and then effectively guarantee the radiation protection effect of super thick raft.
Description
Technical Field
The invention relates to the technical field of radiation-proof raft structures, in particular to an ultra-thick radiation-proof raft L-shaped construction joint structure and a construction method.
Background
Proton and heavy ion treatment technology is the most effective cancer treatment means at present, belongs to one of radiotherapy, is the most advanced technology of internationally recognized radiotherapy, and proton and heavy ion belong to the particle beam together, and different from traditional photon beam, the particle beam can form energy Bragg peak, can reduce the injury to healthy tissue when concentrating the blasting to the tumour. The Xuzhou proton heavy ion hospital is the first hospital containing proton and heavy ion treatment in the Huaihai economic district, and the proton heavy ion treatment area is provided with a proton heavy ion treatment room, a linear accelerator, nuclear medicine, a cyclotron and the like.
Taking Xuzhou proton heavy ion hospital as an example, in order to prevent the influence of proton heavy ion treatment rays on underground water and soil, the raft foundation of the project is 3m thick, and the local thickness reaches 6m. The raft belongs to large-volume concrete construction, and large-volume concrete construction is usually provided with a post-cast strip or is constructed by adopting a skip method due to large hydration heat. And the radiation-proof concrete does not allow the penetration of a construction joint for realizing the radiation-proof effect of the structure, so that the traditional jumping construction can not meet the field requirement due to the existence of the construction joint. Therefore, a new method needs to be developed for the construction of the radiation-proof super-thick raft, and the radiation-proof effect of the structure can be still ensured while the hydration heat of concrete is reduced.
Disclosure of Invention
In order to achieve the purpose, the invention provides an ultra-thick radiation-proof raft L-shaped construction joint structure and a construction method.
The technical scheme is that the raft comprises two construction areas which are divided according to the construction of a raft, wherein the construction areas comprise a first construction area and a second construction area;
the first construction zone comprises a zone raft bottom steel bar, a zone section steel support, a zone raft top steel bar and a raft top plate steel bar sling bar, and the zone section steel support comprises a zone vertical steel support, a zone middle section steel support and a zone top section steel keel;
the second raft in the construction area is divided into an upper pouring section and a lower pouring section along the height, and the lower pouring section comprises reinforcing steel bars at the bottom of the second raft; the upper pouring section comprises a second-region steel support and second-region raft plate top steel bars; the second-region steel support comprises a second-region vertical support and a second-region top steel keel;
construction district one and two boundary positions in construction district are provided with the side direction and hang the mould system, the side direction hangs the mould system and includes base lower part pole setting, pole setting bracing, hangs the mould side brace base, hangs the mould side brace, hangs mould bottom sprag, hangs mould and roof side direction binding off the net, the height that hangs the mould place sets up to half of raft thickness.
The first-region raft plate bottom steel bars and the second-region raft plate bottom steel bars are positioned on the same plane of the bottom of the raft plate;
one district vertical shaped steel supports and is located between one district raft bottom reinforcing bar and one district raft top reinforcing bar, one district vertical shaped steel supports's middle part sets up one district middle part shaped steel supports, one district vertical shaped steel supports's top sets up one district top shaped steel fossil fragments, the top of one district top shaped steel fossil fragments sets up one district raft top reinforcing bar is provided with in construction district one and two hookup location departments of construction district raft top reinforcing bar gets rid of the muscle, raft top reinforcing bar gets rid of the muscle and is located one district raft top reinforcing bar orientation the one end of construction district two.
The suspension mould bottom support is arranged on one side of the end part of the first-region middle section steel support close to the second construction region, and the suspension mould is arranged between the top steel bars of the raft plate of the first region and the suspension mould bottom support;
hang being close to of mould bottom sprag horizontal direction two one sides in the construction district are on a parallel with and hang the mould trend and set up hang the mould side and prop the base, hang the mould side prop the base with hang mould middle part one side and hang the mould side prop the base and hang and all set up between mould top one side hang the mould side prop, the bottom of hanging the mould side prop is fixed hang on the mould side prop the base, the top of hanging the mould side prop support hang on the mould.
The hoisting mould side support base is arranged at the top of the upright rod at the lower part of the base, and the upright rod inclined support is arranged at one side of the upright rod at the lower part of the base, which is far away from the vertical section steel support of the first area;
the top plate lateral closing net is arranged at the position of a rebar throwing bar at the top of the raft.
The extension length of the bottom support of the hanging die is larger than the thickness of the hanging die.
The height of the hanging mould is equal to the distance from the top of the bottom support of the hanging mould to the lower part of the top steel bar of the raft.
The construction is completed the section top of pouring down sets up two district vertical braces, the top of two district vertical braces sets up two district top shaped steel fossil fragments, the top of two district top shaped steel fossil fragments sets up two district raft top reinforcing bar.
A construction method based on an ultra-thick radiation-proof raft L-shaped construction joint structure comprises the following steps:
s1, dividing the construction of a raft into a first construction area and a second construction area according to the site construction condition, starting to bind bottom steel bars of the raft after the foundation pit excavation raft cushion layer construction is completed, and simultaneously binding the bottom steel bars of the first raft in the first construction area and the bottom steel bars of the second raft in the second construction area;
s2, because the thickness of the raft is larger, the plate ribs only comprise plate top steel bars and plate bottom steel bars, and the height is larger, the traditional steel bar stirrup is difficult to support the upper plate top steel bars, when the bottom steel bars of the raft are bound, a first-area vertical steel bar support is synchronously installed, in order to ensure the stability of the first-area vertical steel bar support, the first-area middle steel bar support is installed at the middle position of the first-area vertical steel bar support to form the first-area steel bar support into a whole, a first-area top steel keel is arranged at the top of the first-area vertical steel bar support to serve as the support of the upper steel bars, after all the support structures are completely installed, the top steel bars of the first-area raft are bound, and in the process of completely binding one support structure and the steel bars of the raft in the first-area, the second raft in the construction area only binds the lower steel bars, namely the bottom steel bars of the second-area raft;
s3, reasonably arranging a lateral formwork hanging system at the junction position of the first construction area and the second construction area, wherein the height of the formwork hanging system can be half of the thickness of the raft; in the process of installing the section steel support in the middle of the first area, a hanging formwork bottom support is installed at the end part of the section steel support close to the second construction area, and the extending length of the hanging formwork bottom support needs to meet the hanging formwork support requirement on the upper part;
when the reinforcing steel bars at the bottom of the raft in the second area are bound, the lower upright post of the base is installed, because the stress borne by the hoisting formwork mainly comes from lateral pressure, the side surface of the lower upright post of the base is provided with an upright post inclined strut, the top of the upright post at the lower part of the base is provided with a hoisting formwork side strut base, after the section steel supports in the reinforcing steel bars of the raft in the first construction area are completely installed, the hoisting formwork is installed, after the hoisting formwork is installed, the side struts of the hoisting formwork are installed, and the lower parts of the side struts of the hoisting formwork are fixed on the side strut base of the hoisting formwork;
in order to ensure the connection effectiveness of the connection positions of the top steel bars of the first raft plate and the second raft plate in the construction area, when the top steel bars of the first raft plate are constructed, the connection positions of the top steel bars of the first raft plate and the second raft plate are provided with raft plate top steel bar slings, and a top plate lateral binding net is arranged at the position of the raft plate top steel bar slings;
s4, pouring concrete in the first construction area, wherein due to the existence of the hanging formwork, the space of the raft at the lower part of the hanging formwork in the second construction area can be synchronously poured with the construction area, but concrete in the second construction area and areas with the same height as the hanging formwork is not poured;
s5, after the strength of the concrete of the first construction area and the strength of the concrete of the second lower pouring section of the construction area meet requirements, removing the hanging formwork side support base, the hanging formwork side support and the hanging formwork, and roughening the concrete at the construction position;
s6, mounting second-zone vertical supports and second-zone top section steel keels on the lower raft of the second construction zone after construction is completed, binding second-zone raft top steel bars on the top of the second-zone section steel supports after the second-zone section steel supports are mounted, and finishing pouring of concrete of the second upper pouring section of the second construction zone after all the steel bars are bound.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: this patent is main to the super thick raft structure of proton heavy ion architectural design, research and development a new super thick radiation protection raft mode of pouring, set up hanging formwork system and hanging formwork braced system in construction area one and two hookup locations in construction area, this method can effectively reduce the hydration heat of super thick raft and then reduce the fissured production of concrete, simultaneously with the raft in the subregion, through setting up L type construction joint, can avoid the current adoption back-cast area or jump storehouse to pour the through crack of production, and then effectively guarantee the radiation protection effect of super thick raft.
Drawings
Fig. 1 is a schematic view of the whole structure of the embodiment of the invention, wherein a supporting structure and raft steel bars are completely bound in a construction area, and two raft plates in the construction area are only bound with lower steel bars.
Fig. 2 is a schematic structural diagram of a lateral die-lifting system according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of concrete pouring of a lower pouring section of a construction area I and a construction area II according to an embodiment of the invention.
Fig. 4 is a schematic structural view of the embodiment of the invention for completing the binding of the reinforcing steel bars at the upper part of the second construction zone.
FIG. 5 is a schematic structural view of the second upper pouring section of the construction area after the concrete pouring of the embodiment of the invention is completed.
Wherein the reference numerals are: 100. a first construction area; 1. reinforcing steel bars at the bottom of the raft plate in the first area; 2. a first-area vertical section steel support; 3. a section steel support is arranged in the middle of the first area; 4. a section steel keel at the top of the first area; 5. reinforcing steel bars at the top of the raft in the first area; 7. the raft plate top plate steel bars are subjected to rib throwing; 200. a second construction area; 8. reinforcing steel bars at the bottoms of the raft plates in the second area; 9. a second area vertical support; 10. a section steel keel is arranged at the top of the second area; 11. reinforcing steel bars at the tops of the raft plates in the second area;
6. a lateral form hoisting system; 601. a vertical rod is arranged at the lower part of the base; 602. an upright rod inclined strut; 603. hanging a mould side support base; 604. hanging a mould side support; 605. supporting the bottom of the hoisting mould; 606. lifting the mold; 607. the top plate is provided with a lateral closing net.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
Referring to fig. 1 to 5, the present invention provides an ultra-thick radiation-proof raft L-shaped construction joint structure and a construction method, including two construction zones divided according to the construction of a raft, the construction zones including a first construction zone 100 and a second construction zone 200;
the first construction area 100 comprises first-area raft bottom steel bars 1, first-area section steel supports, first-area raft top steel bars 5 and raft top plate steel bar slingers 7, and the first-area section steel supports comprise first-area vertical steel supports 2, first-area middle section steel supports 3 and first-area top section steel keels 4;
the raft in the second construction area 200 is divided into an upper pouring section and a lower pouring section along the height, and the lower pouring section comprises reinforcing steel bars 8 at the bottom of the raft in the second area; the upper pouring section comprises a second-zone steel support and second-zone raft plate top steel bars 11; the second-zone steel support comprises a second-zone vertical support 9 and a second-zone top steel keel 10;
and a lateral formwork hanging system 6 is arranged at the junction position of the first construction area 100 and the second construction area 200, the lateral formwork hanging system 6 comprises a base lower upright rod 601, an upright rod inclined strut 602, a formwork hanging side strut base 603, a formwork hanging side strut 604, a formwork hanging bottom strut 605, a formwork hanging 606 and a top plate lateral closing-up net 607, and the height of the formwork hanging 606 is half of the thickness of the raft.
The first-zone raft bottom steel bars 1 and the second-zone raft bottom steel bars 8 are positioned on the same plane of the bottom of the raft;
one district vertical section steel supports 2 and is located between one district raft bottom reinforcing bar 1 and one district raft top reinforcing bar 5, the middle part of one district vertical section steel supports 2 sets up one district middle part section steel and supports 3, the top of one district vertical section steel supports 2 sets up one district top section steel fossil fragments 4, the top of one district top section steel fossil fragments 4 sets up one district raft top reinforcing bar 5, be provided with raft top reinforcing bar whipping 7 in construction district one 100 and two 200 hookup location departments of construction district, raft top reinforcing bar whipping 7 is located one district raft top reinforcing bar 5 towards the one end of two 200 of construction district.
The suspension formwork bottom support 605 is arranged on one side of the end part of the first middle section steel support 3 close to the second construction area 200, and the suspension formwork 606 is arranged between the top steel bars 5 of the raft in the first area and the suspension formwork bottom support 605;
and one side of the hanging formwork bottom support 605 in the horizontal direction, which is close to the second 200 construction area, is provided with a hanging formwork side support base 603 in parallel to the trend of the hanging formwork 606, hanging formwork side supports 604 are arranged between the hanging formwork side support base 603 and one side of the middle of the hanging formwork 606 and between the hanging formwork side support base 603 and one side of the top of the hanging formwork 606, the bottom of the hanging formwork side support 604 is fixed on the hanging formwork side support base 603, and the top of the hanging formwork side support 604 is supported on the hanging formwork 606.
The side supporting base 603 of the suspended mould is arranged at the top of the upright 601 at the lower part of the base, and the upright inclined support 602 is arranged at one side of the upright 601 at the lower part of the base, which is far away from the vertical section steel support 2;
roof side direction binding off net 607 sets up 7 positions departments at raft plate top reinforcing bar whipping.
The die bottom support 605 extends a length greater than the thickness of the die 606.
The height of the suspension form 606 is equal to the distance from the top of the suspension form bottom support 605 to the lower part of the top reinforcing bars 5 of one raft.
Pour section top under the completion of construction and set up two district vertical braces 9, two top of district vertical braces 9 set up two district top shaped steel keels 10, and two top of district top shaped steel keels 10 set up two district raft board top reinforcing bars 11.
Take Xuzhou proton heavy ion hospital project raft construction as an example, project raft thickness is 3m, and the board top arrangement of arrangement is 2 layers 28@150 both way arrangement, and the board bottom arrangement of arrangement is 2 layers 32@150 both way arrangement. On-spot when construction raft structure, divide into a plurality of partitions with the raft, every partition progressively pours, but when the partition is poured, does not allow to stay and establishes the construction joint that runs through, for the explanation convenience, this patent introduces with two partitions, and main construction steps are as follows:
s1, dividing the construction of a raft into two construction areas, namely a first construction area 100 and a second construction area 200, after the construction of a raft cushion layer for foundation pit excavation is completed, beginning to bind bottom reinforcing steel bars of the raft, and simultaneously binding the first-area raft bottom reinforcing steel bars 1 of the first construction area 100 and the second-area raft bottom reinforcing steel bars 8 of the second construction area 200 in the binding process;
s2, because the raft is large in thickness, only plate top steel bars and plate bottom steel bars are used as plate bars, and the height is large, the upper plate top steel bars are difficult to support by a traditional steel bar stirrup, when the bottom steel bars of the raft are bound, the first-area vertical steel supports 2 are synchronously installed, in order to ensure the stability of the first-area vertical steel supports 2, the first-area middle steel supports 3 are installed at the middle positions of the first-area vertical steel supports 2 to form the first-area steel supports into a whole, the top of the first-area vertical steel supports 2 is provided with the first-area top steel keels 4 as supports for the upper steel bars, after all the support structures are completely installed, the first-area raft top steel bars 5 are bound, and in the process of completely binding the first-area construction structures and the raft steel bars, the second-area raft 200 only lower steel bars are bound, namely the second-area raft bottom steel bars 8;
s3, reasonably arranging a lateral suspension formwork system 6 at the junction of the first construction area 100 and the second construction area 200, wherein the height of a suspension formwork 606 can be half of the thickness of the raft; in the process of installing the first-zone middle section steel support 3, a hanging formwork bottom support 605 is installed at the end part close to the second construction zone 200, and the extending length of the hanging formwork bottom support needs to meet the supporting requirement of a hanging formwork 606 at the upper part;
when the reinforcing steel bars 8 at the bottoms of the two raft plates are bound for construction, the lower vertical rod 601 of the base is installed, and because the stress borne by the hoisting formwork 606 mainly comes from lateral pressure, the side surface of the lower vertical rod 601 of the base is provided with the vertical rod inclined strut 602, the top of the lower vertical rod 601 of the base is provided with the hoisting formwork side strut base 603, after the steel supports of one area in the reinforcing steel bars of 100 raft plates in a construction area are completely installed, the hoisting formwork 606 is installed, after the hoisting formwork 606 is installed, the hoisting formwork side strut 604 is installed, and the lower part of the hoisting formwork side strut 604 is fixed on the hoisting formwork side strut base 603;
in order to ensure the connection effectiveness of the connection positions of the top steel bars of the first raft 100 and the second raft 200 in the construction area, when the top steel bars 5 of the first raft are constructed, raft top steel bar slingers 7 are arranged at the connection positions of the first raft 100 and the second raft 200 in the construction area, and a top plate lateral closing net 607 is arranged at the positions of the raft top steel bar slingers 7;
s4, pouring 100 concrete in the first construction area, wherein due to the existence of the hanging die 606, the space of the raft in the second construction area 200 at the lower part of the hanging die 606 can be synchronously poured with the first construction area 100, but concrete in the second construction area 200 and the area with the same height as the hanging die 606 is not poured;
s5, after the strength of the concrete of the first construction area 100 and the concrete of the second construction area 200 lower pouring section meets the requirement, the hanging formwork side support base 603, the hanging formwork side support 604 and the hanging formwork 606 are dismantled, and the concrete at the construction position is subjected to roughening treatment;
and S6, mounting a second-region vertical support 9 and a second-region top section steel keel 10 on the lower raft plate with the second construction region 200 constructed, binding second-region raft plate top reinforcing steel bars 11 on the top of the second-region section steel supports after the second-region section steel supports are mounted, and finishing the pouring of the concrete of the pouring section on the second construction region 200 after the reinforcing steel bars are completely bound.
This patent construction method main thinking is that construction area one 100 raft pours to the summit once, and two 200 rafts in construction area divide into two along highly pouring the section, and at the in-process that construction area one 100 was pour, bottom area was pour earlier to construction area two 200, has consequently set up side direction formwork hoist system 6 at the juncture position of construction area one 100 and construction area two 200, and construction area two 200 are poured for the first time highly for the bottom elevation of raft to the bottom elevation of formwork hoist. Because the concrete of the second construction area 200 is poured twice, the whole construction joint between the first construction area 100 and the second construction area 200 is in an L state, and a vertical through construction joint does not exist at a joint position, so that the radiation-proof effect of the raft can be effectively ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (8)
1. An ultra-thick radiation-proof raft L-shaped construction joint structure is characterized by comprising two construction zones divided according to the construction of a raft, wherein each construction zone comprises a construction zone I (100) and a construction zone II (200);
the first construction zone (100) comprises a zone raft bottom steel bar (1), a zone steel support, a zone raft top steel bar (5) and a raft top plate steel bar sling (7), and the zone steel support comprises a zone vertical steel support (2), a zone middle steel support (3) and a zone top steel keel (4);
the raft in the second construction area (200) is divided into an upper pouring section and a lower pouring section along the height, and the lower pouring section comprises reinforcing steel bars (8) at the bottom of the raft in the second area; the upper pouring section comprises a second-region steel support and second-region raft top steel bars (11); the second-zone steel support comprises a second-zone vertical support (9) and a second-zone top steel keel (10);
construction district one (100) and construction district two (200) boundary position are provided with side direction formwork system (6), side direction formwork system (6) include base lower part pole setting (601), pole setting bracing (602), hang mould side brace base (603), hang mould side brace (604), hang mould bottom sprag (605), hang mould (606) and roof side direction binding off net (607), the height at hang mould (606) place sets up to half of raft thickness.
2. The L-shaped construction joint structure of the ultra-thick radiation-proof raft plates of claim 1, wherein the first-zone raft plate bottom steel bars (1) and the second-zone raft plate bottom steel bars (8) are positioned on the same plane of the bottom of the raft plates;
one district vertical shaped steel supports (2) and is located between one district raft bottom reinforcing bar (1) and one district raft top reinforcing bar (5), the middle part of one district vertical shaped steel supports (2) sets up one district middle part shaped steel supports (3), the top of one district vertical shaped steel supports (2) sets up one district top shaped steel fossil fragments (4), the top of one district top shaped steel fossil fragments (4) sets up one district raft top reinforcing bar (5) is provided with in construction district one (100) and two (200) hookup location departments of construction district raft top reinforcing bar gets rid of muscle (7), raft top reinforcing bar gets rid of muscle (7) and is located one district raft top reinforcing bar (5) orientation the one end of two (200) of construction district.
3. The L-shaped construction joint structure of the ultra-thick radiation-proof rafts according to claim 2, wherein the suspension formwork bottom support (605) is arranged on one side of the end part of the first-zone middle section steel support (3) close to the second construction zone (200), and the suspension formwork (606) is arranged between the first-zone raft top steel bar (5) and the suspension formwork bottom support (605);
hang being close to of mould bottom sprag (605) horizontal direction construction district two (200) one side is on a parallel with and hangs mould (606) trend setting hang mould side support base (603), hang mould side support base (603) with hang mould (606) middle part one side and hang mould side support base (603) and hang and all set up between mould (606) top one side hang mould side support (604), the bottom of hanging mould side support (604) is fixed hang on the mould side support base (603), the top of hanging mould side support (604) supports hang on the mould (606).
4. The L-shaped construction joint structure of the ultra-thick radiation-proof raft plates as claimed in claim 3, wherein the hoisting formwork side support base (603) is arranged on the top of the base lower vertical rod (601), and the vertical rod diagonal support (602) is arranged on one side of the base lower vertical rod (601) far away from the vertical section steel support (2);
the top plate lateral closing net (607) is arranged at the position of a steel bar sling (7) at the top of the raft.
5. The L-shaped construction joint structure of the ultra-thick radiation-proof rafts as claimed in claim 3, wherein the extension length of the suspended formwork bottom support (605) is greater than the thickness of the suspended formwork (606).
6. The L-shaped construction joint structure of the ultra-thick radiation-proof rafts according to claim 3, wherein the height of the hanging form (606) is equal to the distance from the top of the hanging form bottom support (605) to the lower part of the top steel bar (5) of the raft.
7. The L-shaped construction joint structure of the ultra-thick radiation-proof rafts according to claim 1, wherein the two-region vertical supports (9) are arranged at the top of the lower pouring section after construction is completed, the two-region top section steel keels (10) are arranged at the tops of the two-region vertical supports (9), and the two-region raft top reinforcing steel bars (11) are arranged at the tops of the two-region top section steel keels (10).
8. A construction method based on an ultra-thick radiation-proof raft L-shaped construction joint structure is characterized by comprising the following steps:
s1, dividing the construction of a raft into two construction areas, namely a construction area I (100) and a construction area II (200), after the construction of a foundation pit excavation raft cushion layer is completed, binding bottom reinforcements of the raft, and simultaneously binding first-area raft bottom reinforcements (1) of the construction area I (100) and second-area raft bottom reinforcements (8) of the construction area II (200) at the time of binding;
s2, because the raft is large in thickness, only plate top steel bars and plate bottom steel bars are used as plate bars, and the height is large, the upper plate top steel bars are difficult to support by a traditional steel bar stirrup, when the raft bottom steel bars are bound, one-zone vertical steel bar supports (2) are synchronously installed, in order to ensure the stability of the one-zone vertical steel bar supports (2), one-zone middle steel bar supports (3) are installed at the middle position of the one-zone vertical steel bar supports (2) to form the one-zone steel bar supports into a whole, one-zone top steel keels (4) are arranged at the tops of the one-zone vertical steel bar supports (2) as supports of the upper steel bars, after all support structures are completely installed, the first-zone raft top steel bars (5) are bound, and in the process that the support structures and the raft steel bars in the first construction zone (100) are completely bound, the second-zone raft in the second construction zone (200) only binds the lower steel bars, namely the second-zone raft bottom steel bars (8);
s3, reasonably arranging a lateral suspension formwork system (6) at the junction position of the construction area I (100) and the construction area II (200), wherein the height of a suspension formwork (606) can be half of the thickness of the raft; in the process of installing the first-zone middle section steel support (3), a hanging formwork bottom support (605) is installed at the end part close to the second construction zone (200), and the extending length of the hanging formwork bottom support needs to meet the supporting requirement of the hanging formwork (606) at the upper part;
when the second-region raft bottom steel bars (8) are bound and constructed, the lower-part upright stanchion (601) of the base is installed, and the stress borne by the hanging formwork (606) mainly comes from lateral pressure, so that the side surface of the lower-part upright stanchion (601) of the base is provided with an upright stanchion inclined strut (602), the top of the lower-part upright stanchion (601) of the base is provided with a hanging formwork side strut base (603), after all section steel struts in the raft steel bars in the first construction region (100) are installed, the hanging formwork (606) is installed, after the hanging formwork (606) is installed, a hanging formwork side strut (604) is installed, and the lower part of the hanging formwork side strut (604) is fixed on the hanging formwork side strut base (603);
in order to ensure the connection effectiveness of the connection positions of the top steel bars of the raft in the first construction area (100) and the second construction area (200), when the top steel bars (5) of the raft in the first construction area are constructed, the connection positions of the first construction area (100) and the second construction area (200) are provided with raft top steel bar slingers (7), and top plate lateral closing-up nets (607) are arranged at the positions of the raft top steel bar slingers (7);
s4, pouring concrete in the first construction area (100), wherein due to the existence of the hanging formwork (606), the space of the raft plate of the second construction area (200) at the lower part of the hanging formwork (606) can be synchronously poured with the first construction area (100), but concrete in the second construction area (200) and the area with the same height as the hanging formwork (606) is not poured;
s5, after the strength of the concrete of the first construction area (100) and the concrete of the lower pouring section of the second construction area (200) meets the requirement, removing a hanging formwork side support base (603), a hanging formwork side support (604) and a hanging formwork (606), and roughening the concrete at the construction position;
s6, installing a second-zone vertical support (9) and a second-zone top section steel keel (10) on the lower raft board of the second construction zone (200) after construction, binding second-zone top section steel bars (11) on the top of the second-zone section steel support after the second-zone section steel support is installed, and finishing pouring of concrete of a pouring section on the second construction zone (200) after all the steel bars are bound.
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