CN110904977B - Municipal foundation pit supporting system and construction method thereof - Google Patents
Municipal foundation pit supporting system and construction method thereof Download PDFInfo
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- CN110904977B CN110904977B CN201911408190.XA CN201911408190A CN110904977B CN 110904977 B CN110904977 B CN 110904977B CN 201911408190 A CN201911408190 A CN 201911408190A CN 110904977 B CN110904977 B CN 110904977B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The embodiment of the invention discloses a municipal foundation pit supporting system which comprises double-layer supporting mechanisms and an elastic adjustable supporting mechanism arranged between the double-layer supporting mechanisms and used for transversely supporting the double-layer supporting mechanisms, wherein a top plate mechanism used for carrying out interference-free temporary supporting on the ground is arranged on the double-layer supporting mechanism positioned on the outer side; also includes the construction method; the invention reduces the occupation of the municipal road surface during the foundation pit construction through various supporting structures, reduces the influence on municipal activities as much as possible, and simultaneously forms a permanent supporting structure by establishing a three-dimensional supporting structure, not only supporting the side surface of the foundation pit, but also supporting the top of the hollowed part of the foundation pit, thereby improving the stability of the foundation pit.
Description
Technical Field
The embodiment of the invention relates to the technical field of foundation pit supporting, in particular to a municipal foundation pit supporting system and a construction method thereof.
Background
In the current foundation pit construction, the foundation pit is protected by a temporary or permanent supporting system so as to ensure the stability of the inner wall of the foundation pit after the foundation pit construction and the forming and ensure the safety and the reliability of the foundation pit operation. In the existing foundation pit operation, the operation range is wide, so that the construction period is long, and the production and the life of the area involved in the foundation pit operation are greatly influenced. Particularly, for municipal foundation pit operation, the influence is more serious, and as the conventional municipal foundation pit operation is located in a road or other areas with more people and traffic flows, the more the areas involved in the foundation pit operation are, the greater influence is exerted on the people and traffic flows in the areas, serious traffic jam can be caused in rush hours, the commuting efficiency is influenced, and meanwhile, the hidden danger of traffic accidents is increased.
Due to the defects of the current supporting system, the existing foundation pit operation is usually to directly open and dig in the range related to the foundation pit, and backfill is carried out after all construction is finished. The existing foundation pit supporting structure is a single-layer sleeve temporary support, only the side wall of a foundation pit can be supported, the top of the foundation pit cannot be supported, the supporting effect is limited, namely the supporting load is limited, in order to guarantee safety, a certain safety buffer distance needs to be arranged on the outer side of the foundation pit, the occupied area of construction can be further enlarged undoubtedly, and the foundation pit supporting system and the foundation pit construction method in the form can not be suitable for municipal construction, and have serious contradictions with the current municipal demand.
Disclosure of Invention
Therefore, the embodiment of the invention provides a municipal foundation pit supporting system and a construction method thereof, and aims to solve the problem that in the prior art, a foundation pit supporting structure and a foundation pit construction method have serious contradiction with the current municipal demand.
In order to achieve the above object, an embodiment of the present invention provides the following:
a municipal foundation pit supporting system comprises double-layer supporting mechanisms and an elastic adjustable supporting mechanism arranged between the double-layer supporting mechanisms and used for transversely supporting the double-layer supporting mechanisms, wherein a top plate mechanism used for carrying out non-interference temporary supporting on the ground is arranged on the double-layer supporting mechanism positioned on the outer side;
the double-deck supporting mechanism includes that two sets of timbering sleeves of strutting are carried out the foundation ditch along the foundation ditch construction extending direction, but elasticity adjusting support mechanism is including being located the top and carrying out the elasticity bow that elastic support carries out elastic support to timbering the sleeve and being located the bottom and carrying out the hydraulic telescoping rod that the rigidity supported to timbering the sleeve, it is two sets of to correspond between the support sleeve and be provided with elasticity bow and hydraulic telescoping rod.
As a preferable scheme of the present invention, a leveling pit for placing a roof mechanism is provided on the ground outside the double-layered supporting mechanism, a concrete reinforcing wall for stabilizing a roadbed is cast at a joint between the leveling pit and the asphalt pavement, the concrete reinforcing wall has a T-shaped cross section, a concrete wall is fixedly installed outside the double-layered supporting mechanism, and the other side of the concrete reinforcing wall is overlapped on the concrete wall that has already been solidified.
As a preferable aspect of the present invention, the elastic bow is disposed in the shovel flat pit, and the roof mechanism spans the concrete reinforcing wall and the two sets of supporting sleeves and is erected on the elastic bow located between the two sets of supporting sleeves;
the hydraulic telescopic rod is fixed between the two groups of supporting sleeves in the process of excavation of a foundation pit, and the length of the hydraulic telescopic rod is adjusted through hydraulic power so as to adaptively adjust the supporting strength of the two groups of supporting sleeves.
As a preferable scheme of the present invention, the supporting sleeves are gradually pulled out in stages at intervals by an interval method, and a supporting sleeve column is formed by pouring immediately after each supporting sleeve is pulled out, a transverse anchoring rib is arranged on the formed supporting sleeve column, a transverse hump beam is arranged by using the transverse anchoring rib as a bearing beam, an anchoring rib frame is arranged on the transverse hump beam, and a bearing supporting base is arranged by using the anchoring rib frame as the bearing beam.
As a preferable scheme of the invention, the anchoring and protecting mechanism comprises anchoring piles which are transversely arranged in the side wall of the foundation pit in a piling and pouring mode, the anchoring piles and the bearing and supporting base are poured to form an integrated structure, and the top arch mechanism is installed between the two corresponding anchoring piles through hinging.
As a preferred scheme of the present invention, a node beam perpendicular to the arch-pushing mechanism is fixedly installed on the arch-pushing mechanism, a plurality of groups of arc-shaped beams which are sequentially overlapped are installed on the node beam along the arch-pushing mechanism, the lengths of the arc-shaped beams are sequentially reduced from bottom to top, and an elastic return spring is fixedly installed between the end of each arc-shaped beam and the node beam.
In addition, the invention also provides a construction method of the municipal foundation pit supporting system, which comprises the following steps:
step 100, driving support sleeves into two sides of a selected pre-excavation foundation pit to support the side wall of the foundation pit, and performing interference-free temporary support on the road surface after the support is formed so as to recover road traffic;
step 200, tunneling a foundation pit;
step 300, arranging hydraulic telescopic rods between each group of corresponding supporting sleeves to form a bottom supporting structure in the process of excavation of the foundation pit, gradually pulling out the supporting sleeves in stages in intervals by an interval method after excavation of the foundation pit is finished, pouring concrete immediately to form supporting sleeve columns when one supporting sleeve is pulled out, and forming a top supporting structure by taking the supporting sleeve columns and the anchoring mechanism as the basis;
and 400, arranging an elastic adjustable supporting mechanism on the top supporting structure to complete permanent supporting.
As a preferred scheme of the present invention, in step 100, the concrete steps of performing non-interference temporary support on the road surface are as follows:
marking warning lines, excavating the roadbed surface after the supporting sleeve is driven in, and pouring concrete pouring walls and concrete reinforcing walls at the edges of the roadbed surface to reinforce the edges of the roadbed surface during excavation;
and supporting the tops of the adjacent supporting sleeves through elastic bows, erecting a top plate mechanism on the concrete reinforced wall, the supporting sleeves and the elastic bows, and removing the warning lines after erecting the top plate mechanism to recover the road traffic.
As a preferred scheme of the present invention, in step 300, the concrete excavation method of the foundation pit is: and carrying out interval division according to the long axis of the foundation pit within the range of the selected pre-excavation foundation pit, excavating in each interval in a direction perpendicular to the long axis of the foundation pit to finish a single excavating process, and carrying out grouting reinforcement treatment on the soil soft region in each excavating process.
As a preferred embodiment of the present invention, in step 300, the concrete steps of forming the top and bottom supporting structures for the foundation pit are as follows:
301, mounting a hydraulic telescopic rod in a single tunneling process to form a bottom supporting structure, and arranging a temporary bottom plate on the surface of the hydraulic telescopic rod;
302, after the excavation of the foundation pit is finished, gradually pulling out the supporting sleeves in different sections by a spacing method in stages, pouring concrete to form a supporting sleeve column immediately after pulling out one supporting sleeve, and arranging anchoring ribs according to the position of an anchoring mechanism to form an anchoring pile by one-step forming pouring when pouring the supporting sleeve column;
step 303, erecting a top arch mechanism and a node beam in each group of anchoring piles to complete permanent support, and removing the temporary support after the permanent support is formed to complete the overall support of the foundation pit.
The embodiment of the invention has the following advantages:
the invention combines two structures of temporary support and permanent support, reduces the area occupied by the foundation pit operation by two modes of side wall support and top support in the process of the foundation pit operation, avoids generating larger influence on municipal traffic, can temporarily support the constructed area in a foundation pit support system to ensure that the non-ongoing area can still be used for normal municipal activities, and can form three-dimensional support with various structures in the foundation pit by adopting a double-layer support mode to ensure the stability of the foundation pit without additionally arranging a safety buffer distance, can directly carry out municipal activities at the edge of the foundation pit or in the foundation pit operation area, and compared with the conventional foundation pit support structure and foundation pit construction method, the invention reduces the occupied area by 30-70%.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic view of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of a support structure for a load bearing support base according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a nodal beam in an embodiment of the present invention;
fig. 4 is a schematic flow chart of a construction method according to an embodiment of the present invention.
In the figure: 1-double-layer supporting mechanism; 2-an elastic adjustable support mechanism; 3-a roof plate mechanism; 4-anchoring and protecting mechanism; 5-a top arch mechanism; 6-leveling the groove pit; 7-node beam;
101-a support sleeve; 102-a load bearing support base; 103-supporting sleeve columns; 104-transverse anchoring ribs; 105-a transverse camel beam; 106-anchoring rib frame;
201-elastic bow; 202-hydraulic telescopic rod;
401-anchoring piles;
601-concrete reinforced wall; 602-concrete casting of walls;
701-cambered surface beam; 702-elastic return reed pipe.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, the invention provides a municipal foundation pit supporting system, which comprises double-layer supporting mechanisms 1 and elastic adjustable supporting mechanisms 2 arranged between the double-layer supporting mechanisms 1 and used for transversely supporting the double-layer supporting mechanisms 1, wherein a top plate mechanism 3 used for carrying out interference-free temporary supporting on the ground is arranged on the double-layer supporting mechanism 1 positioned on the outer side, an anchoring mechanism 4 is arranged on the double-layer supporting mechanism 1 during foundation pit operation construction, and a top arch mechanism 5 used for carrying out permanent supporting on the top of a foundation pit is fixedly arranged on the anchoring mechanism 4.
The method is divided into two stages, namely a first stage is a temporary stage, and a second stage is a permanent supporting structure, wherein the specific supporting structure of the temporary stage is as follows:
double-deck supporting mechanism 1 includes two sets of supporting sleeve 101 of strutting the foundation ditch along the foundation ditch construction extending direction, but elasticity adjusting support mechanism 2 is including being located the top and carrying out elastic support's elasticity bow 201 and being located the bottom and carrying out the hydraulic telescoping rod 202 that the rigidity supported to supporting sleeve 101 supporting sleeve, it is two sets of to correspond between the supporting sleeve 101 and be provided with elasticity bow 201 and hydraulic telescoping rod 202.
In the present embodiment, the elastic bow 201 supports the top of the supporting sleeve 101, so that the vertical offset of the supporting sleeve 101 can be automatically corrected, thereby ensuring the reliability of the temporary supporting structure and the safety during excavation.
The function of the hydraulic telescopic rod 202 is to define a constant distance between a set of two supporting sleeves 101, so as to prevent the external connection function and the elastic force of the elastic bow 201 from causing abnormal deviation of the position and orientation of the supporting sleeves 101 and causing the supporting sleeves 101 to deviate from the normal preset position.
The concrete reinforcing wall 601 is T-shaped on the cross section, a concrete pouring wall 602 is fixedly mounted on the outer side of the double-layer supporting mechanism 1, and the other side of the concrete pouring wall 601 is arranged on the concrete pouring wall 602 which is already solidified.
In this embodiment, the temporary structure is provided for excavation of the foundation pit in order to reduce the influence on municipal activities during foundation pit construction, and therefore, in this embodiment, the concrete reinforcing wall 601 and the concrete reinforcing wall 602 are poured at the joint between the leveling pit 6 and the asphalt pavement to provide a corresponding loading position for the setting of the roof mechanism 3, thereby ensuring that the roof mechanism 3 can be placed in the leveling pit 6 without height jump to ensure that the road can be restored to normal traffic after the roof mechanism 3 is laid.
Specifically, in order to avoid the roof mechanism 3 from being crushed by a motor vehicle or the like after being laid or from being displaced due to friction, the elastic bow 201 is disposed in the leveling pit 6, and the roof mechanism 3 spans the concrete reinforcing wall 601 and the two sets of supporting sleeves 101 and is laid on the elastic bow 201 between the two sets of supporting sleeves 101.
The hydraulic telescopic rod 202 is fixed between the two groups of supporting sleeves 101 in the process of excavation of a foundation pit, and the length of the hydraulic telescopic rod 202 is adjusted through hydraulic power by the hydraulic telescopic rod 202 so as to adaptively adjust the supporting strength of the two groups of supporting sleeves 101.
In the invention, it should be noted that the concrete excavation method of the foundation pit is as follows: and carrying out interval division according to the long axis of the foundation pit within the range of the selected pre-excavation foundation pit, excavating in each interval in a direction perpendicular to the long axis of the foundation pit to finish a single excavating process, and carrying out grouting reinforcement treatment on the soil soft region in each excavating process.
The reason why the excavation is performed in the direction perpendicular to the long axis of the foundation pit in each interval to complete a single excavation process is that the hydraulic telescopic rods 202 can be synchronously arranged to support the support sleeve 101 every time the excavation is performed in the direction perpendicular to the long axis of the foundation pit, so that the position of the support sleeve 101 is prevented from being shifted due to stress weakening after the earth is excavated.
The supporting sleeves 101 are gradually pulled out in stages in a partition method, and the supporting sleeve column 103 is formed by pouring immediately after each supporting sleeve 101 is pulled out.
And arranging a transverse anchoring rib 104 on the formed supporting sleeve column 103, arranging a transverse hump beam 105 by taking the transverse anchoring rib 104 as a bearing beam, arranging an anchoring rib frame 106 on the transverse hump beam 105, and arranging a bearing supporting base 102 by taking the anchoring rib frame 106 as the bearing beam. Through the mode of bar planting and concreting can form perfect hump burden structure to accomplish the support to top arch mechanism 5, thereby play the purpose of protection foundation ditch top.
The anchoring and protecting mechanism 4 comprises anchoring piles 401 which are transversely arranged in the side wall of the foundation pit in a piling and pouring mode, the anchoring piles 401 and the bearing support base 102 are poured to form an integrated structure, and the top arch mechanism 5 is installed between the two corresponding anchoring piles 401 through hinging.
In this embodiment, the supporting structure is further reinforced with a laterally directed grip by anchoring piles on the side walls of the underpass in order to cooperate with the supporting structure. Therefore, the overlying pressure can be effectively converted to the whole space, and the soil layer structure at a certain position is prevented from being damaged by stress concentration.
As can be seen from the above supporting structures, in the present embodiment, the supporting structure is used to support the soil layer and ensure that the entire soil layer is in a very stable structure.
The top arch mechanism 5 is fixedly provided with a node beam 7 which is perpendicular to the top arch mechanism 5, the node beam 7 is provided with a plurality of groups of arc beams 701 which are sequentially overlapped along the top arch mechanism 5, the lengths of the arc beams 701 are sequentially shortened from bottom to top, the end parts of the arc beams 701 are respectively and fixedly provided with an elastic return spring tube 702, and each elastic return spring tube 702 is respectively and fixedly provided with an arc beam 701 arranged on the top arch mechanism 5.
In this embodiment, the top arch mechanism 5 is installed between two corresponding support ribs through a hinge, and the top arch structure of the top arch mechanism 5 transmits the overlying pressure to the support sleeve column, so as to protect the foundation pit at the top, and in this embodiment, in order to reduce the direct pressure of the overlying pressure on the top arch mechanism and the support sleeve column, a node beam 7 perpendicular to the top arch mechanism 5 is fixedly installed on the top arch mechanism 5, the node beam 7 includes a plurality of groups of arc beams 701 sequentially stacked along the top arch mechanism 5, the lengths of the arc beams 701 are sequentially shortened from bottom to top, and an elastic return spring tube 702 is fixedly installed between the end of each arc beam 701 and the node beam 7.
In the embodiment, the active disturbance can be converted into elastic potential energy through the arranged arc-shaped beam 701 to be offset, and the elastic potential energy can be recovered when the disturbance is carried out again, so that the influence of dynamic transverse shearing force and vertical load on the top arch mechanism and the supporting sleeve column is avoided, and the supporting reliability is improved. This is because the concrete supporting structure has strong pressure resistance and weak shear resistance, and long-term dynamic disturbance will destroy the internal structure of the concrete support, so that the supporting capability is reduced. The construction of the above characteristics is combined with a three-dimensional supporting structure, so that the problem can be perfectly overcome, the foundation pit is in underground depth, and underground municipal engineering can be normally involved in rich intervals from the ground to the foundation pit as required, so that the application rate of underground space is improved.
As can be seen from the above foundation pit supporting system, the characteristics of the present embodiment, which are different from the conventional supporting structure, are as follows:
firstly, a temporary mechanism is adopted to support an area which needs to be excavated and temporarily does not need to be worked, so that the normal operation of municipal activities is guaranteed, meanwhile, the stability of a foundation pit is guaranteed by improving a double-layer supporting structure and constructing a three-dimensional support, a safety buffer distance is not required to be additionally arranged, the municipal activities can be directly carried out at the edge of the foundation pit or in an occupied foundation pit operation area, and compared with a conventional foundation pit supporting structure and a foundation pit construction method, the occupied area is reduced by 30% -70%;
second, the retaining structure for foundation pit in this embodiment not only supports the edge of the foundation pit, but also supports the bottom of the hollow part of the foundation pit, and by setting the permanent top retaining structure, the construction of a new retaining structure by completely excavating the hollow part of the foundation pit can be avoided, and the excavation workload of the earthwork and the construction amount of the retaining structure are reduced.
Based on the supporting system, as shown in fig. 4, the embodiment further provides a construction method of the municipal foundation pit supporting system, which includes the following steps:
step 100, driving support sleeves into two sides of the selected pre-excavation foundation pit to support the side wall of the foundation pit, and performing interference-free temporary support on the road surface after the support is formed so as to recover road traffic.
In step 100, the concrete steps of performing non-interference temporary support on the road surface are as follows:
marking warning lines, excavating the roadbed surface after the supporting sleeve is driven in, and pouring concrete pouring walls and concrete reinforcing walls at the edges of the roadbed surface to reinforce the edges of the roadbed surface during excavation;
and supporting the tops of the adjacent supporting sleeves through elastic bows, erecting a top plate mechanism on the concrete reinforced wall, the supporting sleeves and the elastic bows, and removing the warning lines after erecting the top plate mechanism to recover the road traffic.
In this embodiment, the above step mode is one of the main features of the present technical solution, that is, the range influenced by excavation of the foundation pit is reduced, temporary top support is performed on the area which needs construction but is not used for ground work temporarily, road traffic on the ground is not influenced, and the defects that traffic control is required and a large number of channels are occupied in excavation of the foundation pit in the prior art are overcome, so that the exclusive requirements of municipal construction are met.
And 200, after the basic temporary support is completed, tunneling the foundation pit.
Step 300, arranging hydraulic telescopic rods between each group of corresponding supporting sleeves to form a bottom supporting structure in the process of excavation of the foundation pit, gradually pulling out the supporting sleeves in different sections by an interval method after excavation of the foundation pit is completed, pouring concrete immediately to form supporting sleeve columns when one supporting sleeve is pulled out, and forming a top supporting structure by taking the supporting sleeve columns and the anchoring mechanism as a basis.
The concrete steps of forming the top and bottom supporting structures for the foundation pit are as follows:
301, installing a hydraulic telescopic rod in a single tunneling process to form a bottom supporting structure, and arranging a temporary bottom plate on the surface of the hydraulic telescopic rod so as to facilitate passing and avoid direct damage of mechanical pressure to the hydraulic telescopic rod;
302, after the excavation of the foundation pit is finished, gradually pulling out the supporting sleeves in different sections by a spacing method in stages, pouring concrete to form a supporting sleeve column immediately after pulling out one supporting sleeve, and arranging anchoring ribs according to the position of an anchoring mechanism to form an anchoring pile by one-step forming pouring when pouring the supporting sleeve column;
step 303, erecting a top arch mechanism and a node beam in each group of anchoring piles to complete permanent support, and removing the temporary support after the permanent support is formed to complete the overall support of the foundation pit.
And 400, arranging an elastic adjustable supporting mechanism on the top supporting structure to complete permanent supporting.
In summary, in the present embodiment, it is further necessary to further clarify a problem that a supporting structure is firstly supported by a supporting sleeve rather than directly supported by poured concrete, because disturbance may be generated to the supporting structure during excavation, if a permanent supporting structure is directly formed at the beginning, the permanent supporting structure is difficult to be wedged with the supporting structure after the disturbance is generated at a later stage, which affects stability and reliability of the supporting structure, and the permanent supporting structure is formed after excavation of a foundation pit is completed, because there is no problem of secondary disturbance, the service life of the supporting effect is greatly prolonged.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. A municipal foundation pit supporting system is characterized by comprising double-layer supporting mechanisms (1) and an elastic adjustable supporting mechanism (2) which is arranged between the double-layer supporting mechanisms (1) and used for transversely supporting the double-layer supporting mechanisms (1), wherein a top plate mechanism (3) used for non-interference temporary supporting of the ground is arranged on the double-layer supporting mechanism (1) positioned on the outer side, an anchoring mechanism (4) is arranged on the double-layer supporting mechanism (1) during foundation pit operation construction, and a top arch mechanism (5) used for permanent supporting of the top of a foundation pit is hinged and mounted on the anchoring mechanism (4);
double-deck supporting mechanism (1) includes two sets of supporting sleeve (101) of strutting the foundation ditch along the foundation ditch construction extending direction, but elasticity adjusting support mechanism (2) are including being located the top and carrying out elastic support's elasticity bow (201) and being located the bottom and carrying out the hydraulic telescoping rod (202) that the rigidity supported to supporting sleeve (101) two sets of it is provided with elasticity bow (201) and hydraulic telescoping rod (202) to support to correspond between sleeve (101).
2. The municipal foundation pit supporting system according to claim 1, wherein a spading pit (6) for placing the roof mechanism (3) is formed in the ground outside the double-layered supporting mechanism (1), a concrete reinforcing wall (601) for stabilizing the roadbed is cast at the joint of the spading pit (6) and the asphalt pavement, the concrete reinforcing wall (601) is T-shaped in cross section, a concrete casting wall (602) is fixedly installed outside the double-layered supporting mechanism (1), and the other side of the concrete reinforcing wall (601) is lapped on the concrete casting wall (602) which is already solidified.
3. A municipal foundation pit bracing system according to claim 2, wherein the resilient bows (201) are disposed within the spade pit (6) and the roof mechanism (3) spans the concrete retaining wall (601) and the two sets of bracing sleeves (101) and is erected on the resilient bows (201) between the two sets of bracing sleeves (101);
the hydraulic telescopic rod (202) is fixed between the two groups of supporting sleeves (101) in the process of foundation pit excavation, and the length of the hydraulic telescopic rod (202) is adjusted through hydraulic power by the hydraulic telescopic rod (202) so as to adaptively adjust the supporting strength of the two groups of supporting sleeves (101).
4. The municipal foundation pit supporting system according to claim 1, wherein the supporting sleeves (101) are gradually pulled out in sections by intervals according to a spacing method, the supporting sleeve columns (103) are formed by pouring immediately after each supporting sleeve (101) is pulled out, the formed supporting sleeve columns (103) are provided with transverse anchoring ribs (104), transverse hump beams (105) are arranged by taking the transverse anchoring ribs (104) as bearing beams, anchoring rib frames (106) are arranged on the transverse hump beams (105), and bearing supporting bases (102) are arranged by taking the anchoring rib frames (106) as the bearing beams.
5. The municipal foundation pit support system according to claim 4, wherein the anchoring mechanism (4) comprises an anchoring pile (401) disposed laterally in the side wall of the foundation pit in a pile casting manner, the anchoring pile (401) is cast with the load-bearing support base (102) to form an integral structure, and the arch support (5) is installed between the corresponding two anchoring piles (401) by means of hinge joint.
6. The municipal foundation pit supporting system according to claim 5, wherein a node beam (7) perpendicular to the top arch mechanism (5) is fixedly installed on the top arch mechanism (5), a plurality of groups of arc-shaped beams (701) which are sequentially stacked are installed on the node beam (7) along the top arch mechanism (5), the lengths of the arc-shaped beams (701) are sequentially reduced from bottom to top, and an elastic return reed pipe (702) is fixedly installed between the end of each arc-shaped beam (701) and the node beam (7).
7. A construction method of the municipal foundation pit supporting system according to any one of claims 1 to 6, comprising the following steps:
step 100, driving support sleeves into two sides of a selected pre-excavation foundation pit to support the side wall of the foundation pit, carrying out non-interference temporary support on the road surface after forming the support so as to recover road traffic, wherein the specific steps of carrying out non-interference temporary support on the road surface are as follows:
marking warning lines, excavating the roadbed surface after the supporting sleeve is driven in, and pouring concrete pouring walls and concrete reinforcing walls at the edges of the roadbed surface to reinforce the edges of the roadbed surface during excavation;
supporting the tops of adjacent supporting sleeves through elastic bows, erecting a top plate mechanism on the concrete reinforced wall, the supporting sleeves and the elastic bows, and removing warning lines to recover road traffic after the top plate mechanism is erected;
step 200, tunneling a foundation pit;
step 300, arranging hydraulic telescopic rods between each group of corresponding supporting sleeves to form a bottom supporting structure in the process of excavation of the foundation pit, gradually pulling out the supporting sleeves in stages in intervals by an interval method after excavation of the foundation pit is finished, pouring concrete immediately to form supporting sleeve columns when one supporting sleeve is pulled out, and forming a top supporting structure by taking the supporting sleeve columns and the anchoring mechanism as the basis;
and 400, arranging an elastic adjustable supporting mechanism on the top supporting structure to complete permanent supporting.
8. The method of claim 7, wherein in step 300, the excavation is performed by: and carrying out interval division according to the long axis of the foundation pit within the range of the selected pre-excavation foundation pit, excavating in each interval in a direction perpendicular to the long axis of the foundation pit to finish a single excavating process, and carrying out grouting reinforcement treatment on the soil soft region in each excavating process.
9. The method of claim 8, wherein the step 300 of forming the top and bottom support structures for the excavation comprises:
301, mounting a hydraulic telescopic rod in a single tunneling process to form a bottom supporting structure, and arranging a temporary bottom plate on the surface of the hydraulic telescopic rod;
302, after the excavation of the foundation pit is finished, gradually pulling out the supporting sleeves in different sections by a spacing method in stages, pouring concrete to form a supporting sleeve column immediately after pulling out one supporting sleeve, and arranging anchoring ribs according to the position of an anchoring mechanism to form an anchoring pile by one-step forming pouring when pouring the supporting sleeve column;
step 303, erecting a top arch mechanism and a node beam in each group of anchoring piles to complete permanent support, and removing the temporary support after the permanent support is formed to complete the overall support of the foundation pit.
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| CN112854235B (en) * | 2020-12-31 | 2023-04-21 | 中铁建设集团有限公司 | Deep foundation pit supporting structure and stability monitoring and early warning system thereof |
| CN112900453B (en) * | 2021-03-26 | 2022-07-01 | 江西理工大学 | Supporting frame connecting and mounting assembly of curved surface inner wall foundation pit for building construction |
| CN114673040A (en) * | 2022-03-18 | 2022-06-28 | 中铁二院成都勘察设计研究院有限责任公司 | Roadbed supporting structure |
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| KR20170017194A (en) * | 2015-08-05 | 2017-02-15 | 김용여 | Cut and cover retain of earth using light weight decking panel and support plate, and method for constructing this same |
| CN207553113U (en) * | 2017-12-07 | 2018-06-29 | 中鑫建设集团有限公司 | A kind of combined foundation pit exterior-protected device |
| CN209429135U (en) * | 2018-12-20 | 2019-09-24 | 史保田 | A kind of urban construction road surface foundation pit safeguard structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170017194A (en) * | 2015-08-05 | 2017-02-15 | 김용여 | Cut and cover retain of earth using light weight decking panel and support plate, and method for constructing this same |
| CN207553113U (en) * | 2017-12-07 | 2018-06-29 | 中鑫建设集团有限公司 | A kind of combined foundation pit exterior-protected device |
| CN209429135U (en) * | 2018-12-20 | 2019-09-24 | 史保田 | A kind of urban construction road surface foundation pit safeguard structure |
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