CN210288410U - Ultra-large deep foundation pit support-replacing backfill structure - Google Patents
Ultra-large deep foundation pit support-replacing backfill structure Download PDFInfo
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- CN210288410U CN210288410U CN201920630957.2U CN201920630957U CN210288410U CN 210288410 U CN210288410 U CN 210288410U CN 201920630957 U CN201920630957 U CN 201920630957U CN 210288410 U CN210288410 U CN 210288410U
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Abstract
The utility model relates to a super large deep basal pit trades to prop and backfills structure belongs to building construction technical field for solve high-rise building deep basal pit and trade to prop and backfill the problem that has the potential safety hazard. The method comprises the following steps: 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 support replacing belt is arranged between the outer wall of the basement structure and the underground continuous wall in a jumping mode, the support replacing belt and the basement main body structure are constructed simultaneously, the elevation of the support replacing belt is consistent with that of a beam plate of the basement main body structure, one end of the support replacing belt is fixedly connected with the side wall of the outer wall of the basement structure, and the other end of the support replacing belt is connected with a support pile of the underground continuous wall in a hanging mode; the backfill layer is consistent with the elevation of the support replacing plate strip and is formed by pouring light foaming concrete.
Description
Technical Field
The utility model belongs to the technical field of the construction, concretely relates to super large deep basal pit trades to prop and backfills structure.
Background
The support replacement in the deep foundation pit of the super high-rise building needs to adopt corresponding technical measures to replace an inner supporting structure system with a temporary supporting effect according to specific conditions (soil quality and pile foundation bearing capacity), so that after the temporary inner support is dismantled, main structure engineering can be safely carried out, and the stress can be safely and orderly adjusted, transferred and redistributed. The support changing principle enables partial stress generated by removing the inner support of the support pile to be transmitted to a third person with enough bearing capacity through the force transmission component, and therefore new stress balance is achieved. The method can adopt a backfill mode to realize the deformation control and the stress transmission by adopting a rigid supporting piece (inclined strut and horizontal support) to connect the supporting pile with the basement structure. In the conversion process, the enclosure system still plays a considerable role in supporting. The support replacement in the deep foundation pit of the super high-rise building currently has two mature technologies: one is to adopt a horizontal rigid component to change the support, and the other is to add a diagonal support.
However, the horizontal rigid member is adopted for support replacement, and the support replacement mode of transferring the stress of the support system through the beam plate is more suitable for the engineering with relatively tight construction period. The support changing method is characterized in that the main structure beam plate is used for bearing the internal force of the foundation pit, so that the requirement on the main safety of the engineering is greatly improved, and corresponding technical measures are required to reduce potential safety hazards. However, in the actual construction process, the waterproof construction intervention is late, the compactness of the backfill material is difficult to control, and the internal force transmission of a larger foundation pit cannot be guaranteed, so that the backfill material is only used as an auxiliary force transmission belt and tamped; and then a 250-sand 500mm thick plain concrete horizontal annulus is poured above the backfill soil (or sand stone) to serve as a support replacement, and the temporary support system can be removed after the plain concrete reaches the strength required by the design. However, for the engineering with the ultra-large and ultra-deep foundation pit or the main structure with complex stress, the method has the disadvantages of difficult actual operation, low construction efficiency, long construction period and difficult control, and the safety risk probability of the foundation pit enclosure system is obviously increased, thereby seriously influencing the whole construction period.
Although the support changing method for adding the inclined support has short construction period and less investment, the selection of the support points corresponding to the whole enclosure system is difficult, and the whole situation is difficult to be considered; the whole effect of the support replacement is poor and the support replacement is easy to damage. In the actual construction process on site, the distance between the support piles and the side wall (outer wall) of the main structure is narrow, so that the inclined strut needs to penetrate through the wall body to be connected with the bracket of the concrete bottom plate of the basement, the waterproof construction difficulty is increased, and the construction period is delayed by detaching the inclined strut.
Therefore, a novel support-changing backfill method is needed to meet the construction requirement of an ultra-large and ultra-deep foundation pit or an engineering structure with complex stress, and safe, simple and efficient support-changing construction of the ultra-large and ultra-deep foundation pit can be realized.
SUMMERY OF THE UTILITY MODEL
The method aims at solving the problem of engineering quality in different degrees due to unreasonable modes of backfilling and layering compaction when the support of the oversized deep foundation pit of the high-rise building is changed and earthwork is backfilled; and can cause the foundation ditch because of trading the support method improper to have great potential safety hazard, and then lead to the problem of occurence of failure, the utility model aims to provide a super large deep basal pit trades and props backfill structure, can realize that super large deep basal pit's safety, simple and direct, efficient trade props the construction to avoid carrying out work such as secondary demolishment, backfill tamp in narrow and small space, and make it have very strong practicality, satisfy the construction demand.
In order to solve the technical problem, the technical scheme of the utility model as follows:
the utility model provides a structure is backfilled to super large deep basal pit trade and props, it includes:
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 support replacing belt is arranged between the outer wall of the basement structure and the underground continuous wall in a jumping mode, the support replacing belt and the basement main body structure are constructed simultaneously, the elevation of the support replacing belt is consistent with that of a beam plate of the basement main body structure, one end of the support replacing belt is fixedly connected with the side wall of the outer wall of the basement structure, and the other end of the support replacing belt is in hanging connection with a support pile of the underground continuous wall;
and the backfill layer is consistent with the elevation of the support plate replacement strip and is formed by pouring light foamed concrete.
Compared with the prior art, the utility model discloses profitable technological effect lies in:
(1) the utility model discloses a super large deep basal pit trades to prop and backfills structure adopts light foaming concrete to trade to prop and backfills, and self-compaction performance is good, need not to clear up debris and backfill tamped soil operation, has improved backfill efficiency, and light foaming concrete backfill material internal force transmission performance is good moreover. The support is replaced by the support replacing plate belt, and the cabin jumping arrangement ensures that the deep foundation pit is always in a safe and stable state during the construction of the underground structure, greatly saves the construction period and avoids the cost increase caused by labor; the supporting plate is replaced with the jumping cabin, so that the whole stress transmission of an ultra-large deep foundation pit supporting system is not influenced, space construction can be reserved for waterproof heat preservation, the ventilation performance is good, the alternate construction is realized, and the engineering progress is actively promoted.
(2) The utility model discloses a super large deep basal pit trades to prop and backfills structure, and cast-in-place foaming concrete water absorption rate is lower, and relatively independent closed bubble and good wholeness make it have certain waterproof performance. The space between the outer wall of the main structure of the basement and the supporting piles of the underground continuous wall is narrow and small in the ultra-large deep foundation pit, the operation space is narrow, the quality of waterproof construction is difficult to guarantee, and the backfill material also plays a certain waterproof role.
Further, trade built-in reinforcing bar of fagging in-band, the reinforcing bar includes main muscle, vice muscle and hangs the muscle, the one end anchor of main muscle is on the lateral wall of basement structure outer wall, the other end anchor of main muscle is in the drilling of underground continuous wall fender pile, the one end of hanging the muscle is buried underground and is traded the fagging in-band, the other end of hanging the muscle and underground continuous wall's fender pile welded connection.
Furthermore, the support plate replacement belt is formed by pouring early-strength concrete.
Further, the heat-insulating layer and the waterproof layer are further included, and the height of the heat-insulating layer and the height of the waterproof layer, which are higher than the backfill layer, are 300 mm.
Further, the jump bin distance between two adjacent support plate changing belts is 3 m.
Furthermore, a construction joint is reserved on the outer wall of the basement structure, and the height of the construction joint is 300-500 mm higher than the elevation of the beam slab of the basement main structure.
Drawings
The utility model discloses a super large deep basal pit trades to prop and backfills structure is given by following embodiment and attached drawing.
Fig. 1 is a diagram illustrating a positional relationship between a support system and a main structure in a support-replacing backfill structure of an ultra-large deep foundation pit according to an embodiment of the present invention;
fig. 2 is a reinforcement arrangement diagram of a support replacing plate band of the ultra-large deep foundation pit support replacing backfill structure in an embodiment of the invention;
fig. 3 is a schematic view of construction joint setting of the support-replacement backfill structure of the ultra-large deep foundation pit in an embodiment of the present invention;
fig. 4 is a schematic view of waterproof construction at the support plate replacement zone in the ultra-large deep foundation pit support replacement backfill structure in an embodiment of the present invention;
fig. 5 is a schematic view of a backfill layer in a support-replacement backfill structure of an ultra-large deep foundation pit according to an embodiment of the present invention;
fig. 6 is a schematic view of unified backfilling and pouring after the completion of the main structure of the basement according to an embodiment of the present invention;
FIG. 7 is a schematic view of the embodiment of the present invention showing the stress condition of backfilling normal concrete or gravel material (without the support plate-changing belt);
fig. 8 is a schematic view of the stress condition of the backfilled lightweight foamed concrete (with the support plate strip) according to an embodiment of the present invention.
In the figure:
10-bottom plate, 11-cushion layer, 13-outer frame column; 20-underground diaphragm wall; 30-the outer wall of the basement structure,
31-insulating layer, 32-waterproof layer and 33-construction joint; 40-temporary support; 50-basement main structure beam
A plate; 60-support plate changing belt, 61-main rib, 62-auxiliary rib and 63-hanging rib; 70-backfill layer.
Detailed Description
The utility model provides a super large deep basal pit trades and props backfill structure does further detailed description with specific embodiment in the following combination figure. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. For convenience of description, the directions of "up" and "down" in the following description are the same as the directions of "up" and "down" in the drawings, but this should not be construed as limiting the technical solution of the present invention.
Example one
The structural composition of the ultra-large deep foundation pit support-changing backfill structure of the present invention is described with reference to fig. 1 to 8.
The utility model provides a structure is backfilled to super large deep basal pit trade and props, it includes:
the temporary support 40 is arranged in the oversized deep foundation pit, and the temporary support 40 and the foundation pit support structure form a stable foundation pit temporary support system;
the support plate changing belt 60 is arranged between the basement structure outer wall 30 and the underground continuous wall 20 in a jumping mode, the support plate changing belt 60 and the basement main structure are constructed simultaneously, the elevation of the support plate changing belt is consistent with that of a beam plate of the basement main structure, one end of the support plate changing belt is fixedly connected with the side wall of the basement structure outer wall, and the other end of the support plate changing belt is connected with a support pile of the underground continuous wall in a hanging mode;
and the backfill layer 70 is consistent with the elevation of the support plate strip, and the backfill layer 70 is formed by pouring light foamed concrete.
In this embodiment, preferably, the support plate replacement belt 60 is provided with built-in steel bars, each steel bar comprises a main bar 61, an auxiliary bar 62 and a hanging bar 63, one end of each main bar is anchored on the side wall of the outer wall of the basement structure, the other end of each main bar is anchored in a drilling hole of a support pile of the underground continuous wall, one end of each hanging bar is embedded in the support plate replacement belt, and the other end of each hanging bar is welded with the support pile of the underground continuous wall.
In this embodiment, the stay-replacing plate strip 60 is preferably formed by pouring early strength concrete, so that the construction period is short and the construction progress is accelerated.
In this embodiment, it is preferable that the waterproof layer further includes an insulating layer 31 and a waterproof layer 32, and the height of the insulating layer 31 and the height of the waterproof layer 32 higher than the backfill layer are 300mm, so as to ensure the overlapping requirement of the subsequent waterproof construction.
Example two
Please continue to refer to fig. 1 to 8, the present invention further provides a construction method of the above ultra-large deep foundation pit support-replacing backfill structure, the construction method includes the following steps:
step one, constructing a foundation pit enclosure structure, namely sequentially dividing a plurality of regions from top to bottom to arrange temporary supports 40 and excavate earthwork in the foundation pit until the earthwork in the foundation pit is excavated to a base, and pouring a cushion layer 11 and a base bottom plate 10 in time, wherein the foundation pit enclosure structure adopts a mode that an underground continuous wall 20 and a basement structure outer wall 30 are separated;
secondly, pouring the basement main structure and the support plate changing belt 60, arranging the support plate changing belt 60 between the basement structure outer wall 30 and the underground continuous wall 20 in a jumping manner, wherein the elevation of the support plate changing belt 60 is consistent with the elevation of the basement main structure beam plate 50;
step three, after the concrete curing of the basement main structure reaches the design requirement, the template is dismantled, meanwhile, the next temporary support 40 is dismantled, and an insulating layer 31 and a waterproof layer 32 are arranged on the side wall of the basement outer wall;
backfilling light foamed concrete, and pouring and tamping, wherein the backfilling height is the same as the elevation position of the support plate changing belt 60; and
and step five, repeating the step two to the step four until the support replacement and backfill construction of the ultra-large deep foundation pit is completed.
In this embodiment, more preferably, step two includes:
firstly, respectively erecting a scaffold and a template of a basement main body structure, and simultaneously arranging a template and a frame body of a support plate strip;
secondly, binding reinforcing steel bars of the basement main body structure, and binding reinforcing steel bars of the support plate replacement belt after the reinforcing steel bars of the side wall of the basement structure outer wall are bound, so that one end of the reinforcing steel bars of the support plate replacement belt is fixed on the side wall of the basement structure outer wall 30, and the other end of the reinforcing steel bars of the support plate replacement belt is hung and connected on the support piles of the underground continuous wall 20;
and thirdly, pouring concrete of the basement main structure and concrete of the support plate replacement belt respectively, and reserving a construction joint 33 on the side wall of the basement outer wall.
In the present embodiment, the shoring belt 60 is preferably cast with early strength concrete.
In this embodiment, more preferably, step four includes: during backfilling, according to the construction site, appropriate backfilling is determined, or after the temporary support of the whole foundation pit is completely replaced and the whole basement structure is completed, light foamed concrete is backfilled and poured in the area between the underground continuous wall 20 and the basement structure outer wall 30 to serve as a backfilling layer 70.
In this embodiment, more preferably, the skip distance between two adjacent support-changing plate strips 60 is 3 m.
In this embodiment, it is more preferable that the height of the construction joints 33 on the side walls of the external wall 30 of the basement structure is 300mm to 500mm higher than the elevation of the beam slab 50 of the main structure of the basement.
To sum up, the utility model discloses an ultra large deep basal pit trades to prop backfilling structure has following advantage:
(1) the support is replaced by the support replacing plate belt, and the cabin jumping arrangement ensures that the deep foundation pit is always in a safe and stable state during the construction of the underground structure, greatly saves the construction period and avoids the cost increase caused by labor; the supporting plate is replaced with the jumping cabin, so that the whole stress transmission of an ultra-large deep foundation pit supporting system is not influenced, space construction can be reserved for waterproof heat preservation, the ventilation performance is good, the alternate construction is realized, and the engineering progress is actively promoted.
(2) The utility model discloses a super large deep basal pit trades when propping and backfills the construction, according to the atress configuration reinforcing bar, pours in the lump and trades the stay plate area pouring basement major structure in-process, trades the stay plate area and adopts early strong concrete placement, and the structure construction is simple, has not only accelerated the construction progress, has moreover that compression performance is good, the quality is reliable, arrange characteristics such as nimble, with low costs, has very strong practicality.
(3) The utility model discloses a super large deep basal pit trades to prop and backfills structure adopts light foaming concrete to trade to prop and backfills, and self-compaction performance is good, need not to clear up debris and backfill tamped soil operation, has improved backfill efficiency, and light foaming concrete backfill material internal force transmission performance is good moreover.
(4) The utility model discloses a super large deep basal pit trades to prop and backfills structure, and cast-in-place foaming concrete water absorption rate is lower, and relatively independent closed bubble and good wholeness make it have certain waterproof performance. The space between the outer wall of the main structure of the basement and the supporting piles of the underground continuous wall is narrow and small in the ultra-large deep foundation pit, the operation space is narrow, the quality of waterproof construction is difficult to guarantee, and the backfill material also plays a certain waterproof role.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.
Claims (6)
1. The utility model provides a super large deep basal pit trades and props backfill structure which characterized in that, it includes:
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 support replacing belt is arranged between the outer wall of the basement structure and the underground continuous wall in a jumping mode, the support replacing belt and the basement main body structure are constructed simultaneously, the elevation of the support replacing belt is consistent with that of a beam plate of the basement main body structure, one end of the support replacing belt is fixedly connected with the side wall of the outer wall of the basement structure, and the other end of the support replacing belt is in hanging connection with a support pile of the underground continuous wall;
and the backfill layer is consistent with the elevation of the support plate replacement strip and is formed by pouring light foamed concrete.
2. The ultra-large deep foundation pit support-replacing backfill structure according to claim 1, wherein reinforcing steel bars are arranged in the support-replacing strip, the reinforcing steel bars comprise main steel bars, auxiliary steel bars and hanging steel bars, one end of each main steel bar is anchored on the side wall of the outer wall of the basement structure, the other end of each main steel bar is anchored in a drilled hole of the underground continuous wall support pile, one end of each hanging steel bar is embedded in the support-replacing strip, and the other end of each hanging steel bar is welded with the support pile of the underground continuous wall.
3. The ultra-large deep foundation pit bracing-replacing backfill structure according to claim 1, wherein the bracing-replacing belt is formed by pouring early strength concrete.
4. The ultra-large deep foundation pit support-replacing backfill structure according to claim 1, further comprising an insulating layer and a waterproof layer, wherein the height of the insulating layer and the height of the waterproof layer higher than the backfill layer are 300 mm.
5. The ultra-large deep foundation pit support-replacing backfill structure according to claim 1, wherein a skip cabin distance between two adjacent support-replacing plate strips is 3 m.
6. The ultra-large deep foundation pit support-replacing backfill structure according to claim 1, wherein a construction joint is reserved on an outer wall of a basement structure, and the height of the construction joint is 300 mm-500 mm higher than the elevation of a beam plate of a main structure of the basement.
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| CN201920630957.2U CN210288410U (en) | 2019-05-05 | 2019-05-05 | Ultra-large deep foundation pit support-replacing backfill structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080244A (en) * | 2019-05-05 | 2019-08-02 | 上海建工一建集团有限公司 | A kind of super-sized foundation pit support replacement backfill structure and construction method |
| CN113445515A (en) * | 2021-07-23 | 2021-09-28 | 中国建筑第二工程局有限公司 | Construction method for reverse construction of three-row pile support of ultra-deep foundation pit |
| CN114250791A (en) * | 2021-12-31 | 2022-03-29 | 浙江恒鸿建设有限公司 | Construction method of deep foundation pit support replacing system |
-
2019
- 2019-05-05 CN CN201920630957.2U patent/CN210288410U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080244A (en) * | 2019-05-05 | 2019-08-02 | 上海建工一建集团有限公司 | A kind of super-sized foundation pit support replacement backfill structure and construction method |
| CN113445515A (en) * | 2021-07-23 | 2021-09-28 | 中国建筑第二工程局有限公司 | Construction method for reverse construction of three-row pile support of ultra-deep foundation pit |
| CN113445515B (en) * | 2021-07-23 | 2022-08-23 | 中国建筑第二工程局有限公司 | Construction method for reverse construction of three-row pile support of ultra-deep foundation pit |
| CN114250791A (en) * | 2021-12-31 | 2022-03-29 | 浙江恒鸿建设有限公司 | Construction method of deep foundation pit support replacing system |
| CN114250791B (en) * | 2021-12-31 | 2023-03-28 | 浙江恒鸿建设有限公司 | Construction method of deep foundation pit support replacing system |
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