CN111827297A - System and method for sand-egg stratum foundation pit dewatering and excavation construction - Google Patents
System and method for sand-egg stratum foundation pit dewatering and excavation construction Download PDFInfo
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- CN111827297A CN111827297A CN202010758462.5A CN202010758462A CN111827297A CN 111827297 A CN111827297 A CN 111827297A CN 202010758462 A CN202010758462 A CN 202010758462A CN 111827297 A CN111827297 A CN 111827297A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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Abstract
The invention discloses a system and a method for sand-egg stratum foundation pit dewatering and excavation construction, wherein the system comprises a foundation pit supporting assembly, the foundation pit supporting assembly comprises a coaming, and the coaming is of a hollow plate-shaped structure; the coaming comprises an outer side plate connected with the foundation pit and an inner side plate close to the center of the foundation pit, wherein a plurality of communicating holes penetrating through the inner side and the outer side of the outer side plate are formed in the outer side plate; the inner side plate is provided with a water outlet which penetrates through the inner side and the outer side of the inner side plate, and the fluid communication capacity of the water outlet is adjustable; the water tank is fixed on the inner side plate, and the outlet end of the water outlet is positioned in the water tank. The method is based on the system. By adopting the system and the method provided by the scheme, the foundation pit excavation and the construction in the foundation pit are facilitated, and meanwhile, the safety control of the foundation pit drainage is facilitated.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a system and a method for precipitation and excavation construction of a sand-egg stratum foundation pit.
Background
The foundation pit generally refers to a soil pit excavated at the design position of a building foundation according to the elevation of the building foundation and the plane size of the foundation. Aiming at foundation pit construction, the foundation pit supporting system is used as a temporary structure and is a safety protection structure and used for preventing collapse in the foundation pit construction process. Meanwhile, in the excavation and construction processes of the foundation pit, the precipitation problem of the foundation pit needs to be considered.
The sandy gravel geology generally has loose stratums and rich water, and particularly needs to pay attention to the influence of stratum rainfall on the surrounding environment in the foundation pit construction of a building with the sandy gravel stratum close to the water-rich sand gravel stratum. Therefore, in the existing construction, a series of problems of large construction difficulty, large influence on the surrounding environment and the like exist in the construction process of a sand-gravel stratum deep foundation pit (foundation pit engineering with excavation depth of more than 5 meters (including 5 meters) or depth of less than 5 meters, but geological conditions, surrounding environment and underground pipelines are particularly complex).
The research on water-rich sand-egg stratum deep foundation pit dewatering optimization and risk control is carried out, and the method has important significance for building construction.
Disclosure of Invention
Aiming at the technical problem that development of water-rich sand-egg stratum deep foundation pit dewatering optimization and risk control research has great significance for construction of the building, the invention provides a system and a method for sand-egg stratum foundation pit dewatering and excavation construction.
The system for the precipitation of the sand-egg stratum foundation pit and the excavation construction comprises a foundation pit supporting assembly, wherein the foundation pit supporting assembly comprises a coaming plate which is of a hollow plate-shaped structure;
the coaming comprises an outer side plate connected with the foundation pit and an inner side plate close to the center of the foundation pit, wherein a plurality of communicating holes penetrating through the inner side and the outer side of the outer side plate are formed in the outer side plate;
the inner side plate is provided with a water outlet which penetrates through the inner side and the outer side of the inner side plate, and the fluid communication capacity of the water outlet is adjustable;
the water tank is fixed on the inner side plate, and the outlet end of the water outlet is positioned in the water tank.
The technical scheme is favorable for optimizing the precipitation of the sand-gravel stratum foundation pit and controlling the risk by aiming at the problems that the construction difficulty is large and the peripheral environment is easily influenced in the construction process of the sand-gravel stratum foundation pit, particularly the deep foundation pit construction process, and the sand-gravel stratum is usually accompanied by the characteristic of water enrichment and is extremely easy to collapse.
This scheme is when concrete when using, and the bounding wall can adopt the concatenation of polylith panel to form, like according to interior design, to the scheme that does not adopt the filter screen, can adopt 6 dull and stereotyped welding, to including the filter screen and need carry out the scheme of maintaining to the filter screen, set up to one of them dull and stereotyped rather than the dull and stereotyped bolted connection that meets etc.. The inner side plate of the coaming is attached to the wall surface of the foundation pit, so that the coaming is used as a retaining wall of the foundation pit.
Specifically, set up to including setting up intercommunicating pore on the outer panel, setting up outlet on the interior plate, setting up the basin on the interior plate on the bounding wall, when specifically using, this scheme provides an implementation scheme who utilizes the bounding wall as foundation ditch lateral wall drainage if the characteristics that do not easily utilize well point precipitation to realize precipitation to the sand egg stratum: the water that oozes by the foundation ditch lateral wall gets into the inside of bounding wall through the intercommunicating pore, assembles to the basin in through the outlet again to under the condition that provides the support for the foundation ditch lateral wall, reach the purpose of safe, the convenient foundation ditch precipitation that realizes.
Meanwhile, the loose problem of the sand-egg stratum is considered, the water outlet is adjustable in fluid conduction capacity, the water body is led out through the water outlet as little as possible on the premise that foundation pit excavation precipitation can be achieved according to foundation pit excavation requirements, so that the influence of foundation pit construction on the underground water level is reduced, the possibility that the foundation pit construction causes overlarge holes around the foundation pit is reduced, and safety precipitation or drainage is achieved.
The further technical scheme is as follows:
as a concrete scheme that the fluid conducting capacity of the water outlet is adjustable, the water outlet is provided with the following components: the number of the water outlets is multiple, and the blocking state of part or all of the water outlets can be adjusted. According to the scheme, the water outlet flow of the enclosing plate is adjusted through the water outlets, and a mode of blocking part of the water outlets is adopted as a specific adjusting mode. When the drainage device is used specifically, if the drainage of the foundation pit does not meet the safety requirement, the drainage device can adopt a state of completely blocking the upper drainage hole.
This scheme is when concrete implementation, for realizing that the bounding wall passes through many gradients of outlet discharge flow adjustable, preferred setting is as many as possible to outlet quantity, simultaneously, to the water guide ability at foundation ditch edge on considering the bounding wall outer panel, avoids concentrating the water guide and leads to the too big influence that enlarges foundation ditch excavation and cause the bottom of foundation ditch local hole, and preferred adoption intercommunicating pore evenly distributed is at the mode on the whole face of outer panel, prevents stifled scheme as an outlet, sets up to: the filter screen is arranged in the hollow space of the enclosing plate, and the hollow space is divided into an outer side cavity and an inner side cavity by the filter screen in the plate thickness direction of the enclosing plate, wherein the outer side cavity is a cavity between the filter screen and the outer side plate, and the inner side cavity is a cavity between the filter screen and the inner side plate;
the mud discharging port is connected to the bottom side of the enclosing plate, and the inlet end of the mud discharging port is connected with the inner side cavity;
the water injection port is connected to the enclosing plate, and the outlet end of the water injection port is connected with the inner side cavity;
and the sludge discharge port and the water injection port are respectively provided with a cut-off device for controlling the on-off state of each. In the scheme, the filter screen is used as a filter component between the communication hole and the water outlet, so that the water outlet is prevented from being blocked due to the fact that sand, mud and the like are introduced into the enclosing plate in a short time due to more communication holes; set up to include mud discharging port, water filling port aim at realizing: periodically or under the condition of need, injecting cleaning water through the water injection port to clean the outer cavity, and then discharging the cleaning water through the sludge discharge port; the device is characterized by also comprising a cutting device, aiming at realizing the cutting of the sludge outlet under the unnecessary condition, and the fluid is only enriched in the water tank and pumped out by a common pump body; the positions of the sludge discharge port and the water injection port are limited, and the whole filtering surface of the filter screen is covered by the cleaning water as much as possible; the setting of cutting the device more than not only aims at realizing above current-limiting purpose, also can regard as the space of keeping in of entering bounding wall sand, mud through the outside cavity simultaneously, if utilize sand, the mud of certain time interval outside cavity accumulation, judge the influence of precipitation flow this moment to the stratum security.
As a technical scheme for solving the problem of the blockage of the communication hole by introducing pressure gas into the hollow space of the enclosing plate under the condition of closing each water outlet and shutting off the cut-off device, the device is provided with the following components: each water outlet is matched with a plug, and the water outlet also comprises a communicating pipe which is connected to the enclosing plate, and the outlet end of the communicating pipe is communicated with the hollow space.
As a technical scheme convenient for cleaning and maintenance in the installation and use processes of the filter screen: the connection of the filter screen and the coaming is realized through the following modes: the other four surfaces of the coaming are respectively an upper end surface, a lower end surface, a left end surface and a right end surface, and any one of the other four surfaces is connected to the coaming through a bolt;
two chutes which are in a dead-against relation are arranged on the wall surface of the hollow space of the enclosing plate, and the filter screen is clamped in the hollow space through the chutes;
the starting end of the sliding groove is opposite to the surface of the bolt connected to the enclosing plate. This scheme of adoption, after the face of detaching bolted connection on the bounding wall, can accomplish the dismantlement or the installation of filter screen through taking out, inserting the operation.
For reducing the design to filter screen structural strength or rigidity to realize that filter screen lightweight design carries out corresponding operation with the convenience to the filter screen, the design is: the filter screen is used as the surface of the boundary of the inner cavity to be supported on the support plate.
As a technical scheme convenient for finishing the bounding wall at the edge of the foundation pit, the method is characterized in that: still including the support frame that is used for supporting the bounding wall, the support frame includes pole setting and many horizontal poles of arranging along pole setting axis direction, the horizontal pole is as the support piece between pole setting and the bounding wall inboard, the length of horizontal pole is adjustable.
As a specific scheme that the length of the cross rod is adjustable and is convenient to adjust, the cross rod comprises a threaded cylinder and a threaded rod which are connected in series, the threaded cylinder is in threaded connection and coaxial with the threaded rod, the threaded cylinder is connected with the upright rod, and a base plate is further arranged between the end part of the threaded rod and the inner side of the enclosing plate;
the backing plate includes: the first plate body, the second plate body for plastic slab or graphite plate, the third plate body for the steel sheet of steel sheet, first plate body and threaded rod fixed connection, the centre gripping of second plate body is between first plate body and third plate body, the outside and the bounding wall inboard contact of bottom plate body. This scheme simple structure, the antifriction panel between first plate body and the third plate body is regarded as to the second plate body to realize that first plate body and third plate body rotate relatively.
As one kind through balanced pole setting both sides atress, be convenient for stabilize the position of pole setting in the space for the support frame is split type structure, and the support frame position of being convenient for shifts and saves, makes can be according to the technical scheme of the convenient adjustment horizontal pole position of concrete support needs, sets up to: the device also comprises sleeves which are sleeved on the vertical rods and can slide along the axial lines of the vertical rods, two cross rods are fixed on each sleeve, and the cross rods on each sleeve are in line symmetry relative to the axial lines of the sleeves;
and the locking device is used for realizing the position locking of the sleeve on the axis of the cross bar. The locking device can adopt a bolt which is in threaded connection with the sleeve, and the locking is completed in a jacking mode, or a bolt which is arranged between the sleeve and the upright rod is adopted.
The scheme also discloses a method for the precipitation and excavation construction of the sand-egg stratum foundation pit, which is based on the system in any item, and the method is realized through the following steps:
s1, arranging a reinforcing mesh serving as a steel structure framework inside the concrete wall body on the wall surface of the excavated foundation pit;
s2, arranging a plurality of grouting pipes on the outer wall of the reinforcing mesh, wherein the grouting pipes are arranged at intervals, the gap between every two adjacent grouting pipes is used as a fluid circulation channel between the inlet end of the communication hole and the reinforcing mesh, a plurality of grouting holes are arranged on each grouting pipe along the axial line, and the openings of the grouting holes face the reinforcing mesh;
s3, erecting a coaming, wherein the outer wall of the outer side plate is attached to the grouting pipe;
s4, in the process of foundation pit excavation and construction, the side surface of the foundation pit is flushed with water and discharged by using the enclosing plate as a soil-retaining and water-discharging wall, and the flow control of the water discharge is realized by adjusting the fluid conduction capacity of a water discharge opening;
and S5, after foundation pit excavation and construction are completed, injecting concrete or slurry into the reinforcing mesh by using the grouting pipe, and using the enclosing plate as a supporting template in the concrete or slurry curing process. The method provides a technical scheme relating to foundation pit drainage and foundation pit long-term support setting in the foundation pit construction process: specifically, the installation of the foundation equipment is completed in steps S1 to S3, the foundation pit dewatering is realized by using the system in step S4, and the long-term support is formed in step S5 to serve as a long-term retaining wall and a water plugging layer. The long-term support is formed, and by adopting the system and the method, different from the prior art, in the precipitation process, aiming at the cavity which is formed by the sand-egg stratum easily due to precipitation and is close to the outer side plate of the enclosing plate, the grouting pipe is utilized, and the cavity can be filled with mortar to be beneficial to the stability of the stratum around the foundation pit. Simultaneously, this scheme provides one kind and not only can realize the foundation ditch precipitation, can realize the technical scheme of system's multipurpose simultaneously.
The invention has the following beneficial effects:
in the system architecture design that this scheme provided, concrete, set up to including setting up intercommunicating pore on the outer panel, setting up outlet on the interior plate, setting up the basin on the interior plate on the bounding wall, when specifically using, this scheme is if the characteristics that are difficult for utilizing well point precipitation to realize precipitation to the sand egg stratum, provides an implementation scheme that utilizes the bounding wall as foundation ditch lateral wall drainage: the water that oozes by the foundation ditch lateral wall gets into the inside of bounding wall through the intercommunicating pore, assembles to the basin in through the outlet again to under the condition that provides the support for the foundation ditch lateral wall, reach the purpose of safe, the convenient foundation ditch precipitation that realizes.
Meanwhile, the loose problem of the sand-egg stratum is considered, the water outlet is adjustable in fluid conduction capacity, the water body is led out through the water outlet as little as possible on the premise that foundation pit excavation precipitation can be achieved according to foundation pit excavation requirements, so that the influence of foundation pit construction on the underground water level is reduced, the possibility that the foundation pit construction causes overlarge holes around the foundation pit is reduced, and safety precipitation or drainage is achieved.
In the design of the method provided by the scheme, the steps S1 to S3 are to finish the installation of basic equipment, the step S4 is to utilize the system to realize foundation pit dewatering, and the step S5 is to form long-term support to be used as a long-term retaining wall and a water plugging layer. The long-term support is formed, and by adopting the system and the method, different from the prior art, in the precipitation process, aiming at the cavity which is formed by the sand-egg stratum easily due to precipitation and is close to the outer side plate of the enclosing plate, the grouting pipe is utilized, and the cavity can be filled with mortar to be beneficial to the stability of the stratum around the foundation pit. Simultaneously, this scheme provides one kind and not only can realize the foundation ditch precipitation, can realize the technical scheme of system's multipurpose simultaneously.
Drawings
FIG. 1 is a side view of an embodiment of the system for precipitation and excavation of a sand-gravel formation pit of the present invention;
fig. 2 is a partial schematic view of an embodiment of the system for sand-gravel formation foundation pit dewatering and excavation according to the present invention, which is used to reflect the structural composition of the enclosure portion.
The reference numbers in the figures are in order: 1. the concrete pouring device comprises a coaming, 2, a cross rod, 3, a vertical rod, 4, a threaded cylinder, 5, a threaded rod, 6, a backing plate, 7, a mud discharging port, 8, a communicating pipe, 9, a water injecting port, 10, a grouting pipe, 11, a reinforcing mesh, 12, a water tank, 13, a water discharging port, 14, a plug, 15, a communicating hole, 16, a filter screen, 17 and a supporting plate.
Detailed Description
The present invention will be described in further detail with reference to examples, but the structure of the present invention is not limited to the following examples.
Example 1:
as shown in fig. 1 and 2, the system for sand-gravel stratum foundation pit dewatering and excavation construction comprises a foundation pit supporting assembly, wherein the foundation pit supporting assembly comprises a coaming 1, and the coaming 1 is of a hollow plate-shaped structure;
the coaming 1 comprises an outer side plate connected with the foundation pit and an inner side plate close to the center of the foundation pit, wherein a plurality of communicating holes 15 penetrating through the inner side and the outer side of the outer side plate are formed in the outer side plate;
the inner side plate is provided with a water outlet 13 which penetrates through the inner side and the outer side of the inner side plate, and the fluid communication capacity of the water outlet 13 is adjustable;
the water tank 12 is fixed on the inner side plate, and the outlet end of the water outlet 13 is positioned in the water tank 12.
The technical scheme is favorable for optimizing the precipitation of the sand-gravel stratum foundation pit and controlling the risk by aiming at the problems that the construction difficulty is large and the peripheral environment is easily influenced in the construction process of the sand-gravel stratum foundation pit, particularly the deep foundation pit construction process, and the sand-gravel stratum is usually accompanied by the characteristic of water enrichment and is extremely easy to collapse.
This scheme is when concrete when using, and bounding wall 1 can adopt the concatenation of polylith panel to form, like according to interior design, to the scheme that does not adopt filter screen 16, can adopt 6 dull and stereotyped weldings, to including filter screen 16 and need carry out the scheme of maintaining filter screen 16, sets up to one of them dull and stereotyped rather than the dull and stereotyped bolted connection that meets etc.. The inner side plate of the coaming 1 is attached to the wall surface of the foundation pit, so that the coaming 1 is used as a retaining wall of the foundation pit.
Specifically, set up to including setting up intercommunicating pore 15 on the outer panel, setting up outlet 13 on the inner panel, setting up basin 12 on the inner panel on bounding wall 1, when specifically using, this scheme provides an implementation scheme who utilizes bounding wall 1 as foundation ditch lateral wall drainage if the characteristics of difficult utilization well point precipitation realization precipitation to sand egg stratum: the water body that oozes by the lateral wall of foundation ditch gets into the inside of bounding wall 1 through intercommunicating pore 15, gathers to in basin 12 through outlet 13 again to under the condition that provides the support for the lateral wall of foundation ditch, reach the purpose safe, conveniently realize foundation ditch precipitation.
Meanwhile, the loose problem of the sand-egg stratum is considered, the water outlet 13 is adjustable in fluid conduction capacity, the water outlet 13 is used for leading out water as little as possible on the premise that foundation pit excavation precipitation can be achieved according to foundation pit excavation requirements, so that the influence of foundation pit construction on the underground water level is reduced, the possibility that the foundation pit construction causes overlarge holes around the foundation pit is reduced, and safety precipitation or drainage is achieved.
Example 2:
as shown in fig. 1 and fig. 2, the present embodiment is further defined on the basis of embodiment 1: as a specific solution for adjusting the fluid conducting capacity of the water discharge port 13, the following are provided: the number of the water discharge openings 13 is multiple, and the blocking state of part or all of the water discharge openings 13 can be adjusted. According to the scheme, the water outlet flow of the enclosing plate 1 is adjusted through the water outlets 13, and the specific adjusting mode adopts a mode of blocking part of the water outlets 13. When the drainage device is used specifically, if the drainage of the foundation pit does not meet the safety requirement, the drainage device can adopt a state of completely blocking the upper drainage port 13.
This scheme is when concrete implementation, for realizing that bounding wall 1 passes through outlet 13 drainage flow many gradients adjustable, the preferred 13 quantity that sets up into the outlet is as many as possible, simultaneously, consider the water guide ability to the foundation ditch edge on the 1 outer panel of bounding wall, avoid concentrating the water guide and lead to the too big influence that enlarges foundation ditch excavation and cause the bottom of foundation ditch local hole, the preferred mode that adopts 15 evenly distributed of intercommunicating pore on the whole face of outer panel, as an outlet 13 prevents stifled scheme, sets up to: the filter screen 16 is arranged in the hollow space of the enclosing plate 1, and in the plate thickness direction of the enclosing plate 1, the hollow space is divided into an outer side cavity and an inner side cavity by the filter screen 16, wherein the outer side cavity is a cavity between the filter screen 16 and the outer side plate, and the inner side cavity is a cavity between the filter screen 16 and the inner side plate;
the mud discharging port 7 is connected to the bottom side of the enclosing plate 1, and the inlet end of the mud discharging port is connected with the inner cavity;
the water injection port 9 is connected to the surrounding plate 1, and the outlet end of the water injection port is connected with the inner side cavity;
the sludge discharge port 7 and the water injection port 9 are both provided with cut-off devices for controlling the on-off state of each. In the scheme, the filter screen 16 is used as a filter component between the communication hole 15 and the water discharge opening 13, so that the water discharge opening 13 is prevented from being blocked due to the fact that sand, mud and the like are introduced into the enclosing plate 1 in a short time due to more communication holes 15; set up to include mud discharging port 7, water filling port 9 aim at realizing: periodically or under the condition of need, injecting cleaning water through the water injection port 9 to clean the outer cavity, and then discharging the cleaning water through the sludge discharge port 7; the device is provided with a cutting device, and aims to realize cutting of the sludge outlet 7 under an optional condition, and the fluid is only enriched in the water tank 12 and is pumped out by a common pump body; the positions of the sludge discharge port 7 and the water injection port 9 are limited, and the whole filtering surface of the filter screen 16 is covered by the cleaning water as much as possible; the setting of cutting the device more than not only aims at realizing above current-limiting purpose, also can regard as the space of keeping in of getting into 1 sand of bounding wall, mud through the outside cavity simultaneously, if utilize sand, the mud of certain time interval outside cavity accumulation, judge the influence of precipitation flow this moment to the stratum security.
In order to solve the problem of clogging of the communication hole 15 by introducing a gas under pressure into the hollow space of the shroud 1 when the shut-off means is closed by closing the respective water discharge ports 13, the following means is provided: each water outlet 13 is matched with a plug 14 and also comprises a communicating pipe 8 which is connected to the enclosing plate 1 and the outlet end of which is communicated with the hollow space.
As a technical scheme for facilitating the cleaning and maintenance of the filter screen 16 during the installation and use processes: the connection of the filter screen 16 and the coaming 1 is realized by the following modes: the rest four surfaces of the coaming 1 are respectively an upper end surface, a lower end surface, a left end surface and a right end surface, and any one of the rest four surfaces is connected to the coaming 1 through a bolt;
two chutes which are in a facing relation are arranged on the wall surface of the hollow space of the enclosing plate 1, and the filter screen 16 is clamped in the hollow space through the chutes;
the starting end of the sliding groove is opposite to the surface of the enclosing plate 1 connected with the bolt. This scheme of adoption, after the face of detaching bolted connection on bounding wall 1, can accomplish the dismantlement or the installation of filter screen 16 through taking out, inserting the operation.
For the design of reducing filter screen 16 structural strength or rigidity to realize filter screen 16 lightweight design and carry out corresponding operation with the convenience to filter screen 16, design is: the filter screen is characterized by further comprising a supporting plate 17 arranged in the inner cavity, and the filter screen 16 is supported on the supporting plate 17 as the surface of the boundary of the inner cavity.
As a technical scheme convenient for finishing the bounding wall 1 at the edge of the foundation pit, the method is characterized in that: still including the support frame that is used for supporting bounding wall 1, the support frame includes pole setting 3 and many horizontal poles 2 of arranging along 3 axis directions in pole setting, horizontal pole 2 is as the support piece between pole setting 3 and the 1 inboard of bounding wall, the length of horizontal pole 2 is adjustable.
As a specific scheme that the length of the cross rod 2 is adjustable and convenient to adjust, the cross rod 2 comprises a threaded cylinder 4 and a threaded rod 5 which are connected in series, the threaded cylinder 4 is in threaded connection and coaxial with the threaded rod 5, the threaded cylinder 4 is connected with the upright rod 3, and a base plate 6 is further arranged between the end part of the threaded rod 5 and the inner side of the enclosing plate 1;
the pad 6 includes: for the first plate body of steel sheet, for the second plate body of plastic slab or graphite plate, for the third plate body of steel sheet, first plate body and 5 fixed connection of threaded rod, the centre gripping of second plate body is between first plate body and third plate body, the outside and the 1 inboard contact of bounding wall of bottom plate body. This scheme simple structure, the antifriction panel between first plate body and the third plate body is regarded as to the second plate body to realize that first plate body and third plate body rotate relatively.
As one kind through 3 both sides atress of balanced pole setting, be convenient for stabilize the position of pole setting 3 in the space for the support frame is split type structure, and the support frame position of being convenient for shifts and saves, makes can be according to the convenient technical scheme of adjustment horizontal pole 2 positions of concrete support needs, sets up to: the device also comprises sleeves which are sleeved on the vertical rods 3 and can slide along the axial lines of the vertical rods 3, two cross rods 2 are fixed on each sleeve, and the cross rods 2 on each sleeve are in line symmetry relative to the axial lines of the sleeves;
and locking means for achieving the positional locking of the sleeve on the axis of the crossbar 2. The locking device can adopt a bolt which is in threaded connection with the sleeve, and the locking is completed in a jacking mode, or a bolt which is arranged between the sleeve and the upright rod 3 is adopted.
Example 3:
the embodiment discloses a method for sand-egg stratum foundation pit dewatering and excavation construction, which is based on the system provided by any one of the embodiments, and is realized by the following steps:
s1, arranging a reinforcing mesh 11 as a steel structure framework in the concrete wall body on the wall surface of the excavated foundation pit;
s2, arranging a plurality of grouting pipes 10 on the outer wall of the reinforcing mesh 11, wherein the grouting pipes 10 are arranged at intervals, the gap between adjacent grouting pipes 10 is used as a fluid flow channel between the inlet end of the communication hole 15 and the reinforcing mesh 11, a plurality of grouting holes are arranged on the grouting pipes 10 along the axis, and the openings of the grouting holes face the reinforcing mesh 11;
s3, erecting the coaming 1, wherein the outer wall of the outer side plate is attached to the grouting pipe 10;
s4, in the process of foundation pit excavation and construction, the coaming 1 is used as a soil-retaining drainage wall to realize the drainage of water gushing from the side surface of the foundation pit, and the drainage flow control is realized by adjusting the fluid conduction capacity of the drainage outlet 13;
and S5, after foundation pit excavation and construction are completed, injecting concrete or slurry into the reinforcing mesh 11 by using the grouting pipe 10, and using the coaming 1 as a supporting template in the concrete or slurry curing process. The method provides a technical scheme relating to foundation pit drainage and foundation pit long-term support setting in the foundation pit construction process: specifically, the installation of the foundation equipment is completed in steps S1 to S3, the foundation pit dewatering is realized by using the system in step S4, and the long-term support is formed in step S5 to serve as a long-term retaining wall and a water plugging layer. The long-term support is formed, and by adopting the system and the method, different from the prior art, in the precipitation process, aiming at the cavity which is easy to form due to precipitation and is close to the outer side plate of the enclosing plate 1, the grouting pipe 10 is utilized, so that the cavity can be filled with mortar to be beneficial to the stability of the stratum around the foundation pit. Simultaneously, this scheme provides one kind and not only can realize the foundation ditch precipitation, can realize the technical scheme of system's multipurpose simultaneously.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. For those skilled in the art to which the invention pertains, other embodiments that do not depart from the gist of the invention are intended to be within the scope of the invention.
Claims (10)
1. The system for sand-egg stratum foundation pit dewatering and excavation construction comprises a foundation pit supporting assembly, wherein the foundation pit supporting assembly comprises a coaming (1), and is characterized in that the coaming (1) is of a hollow plate-shaped structure;
the coaming (1) comprises an outer side plate connected with the foundation pit and an inner side plate close to the center of the foundation pit, wherein a plurality of communicating holes (15) penetrating through the inner side and the outer side of the outer side plate are formed in the outer side plate;
the inner side plate is provided with a water outlet (13) which penetrates through the inner side and the outer side of the inner side plate, and the fluid communication capacity of the water outlet (13) is adjustable;
the water tank (12) is fixed on the inner side plate, and the outlet end of the water outlet (13) is positioned in the water tank (12).
2. The system for sand-egg formation foundation pit dewatering and excavation construction according to claim 1, wherein the number of the water discharge openings (13) is multiple, and the blocking state of part or all of the water discharge openings (13) is adjustable.
3. The system for sand-egg stratum foundation pit dewatering and excavation construction according to claim 1, characterized by further comprising a filter screen (16) arranged in the hollow space of the enclosing plate (1), wherein the filter screen (16) divides the hollow space into an outer cavity and an inner cavity in the plate thickness direction of the enclosing plate (1), the outer cavity is a cavity between the filter screen (16) and the outer plate, and the inner cavity is a cavity between the filter screen (16) and the inner plate;
the mud discharging port (7) is connected to the bottom side of the enclosing plate (1), and the inlet end of the mud discharging port is connected with the inner cavity;
the water injection port (9) is connected to the enclosing plate (1), and the outlet end of the water injection port is connected with the inner side cavity;
the sludge discharge port (7) and the water injection port (9) are provided with cut-off devices for controlling the on-off states of the sludge discharge port and the water injection port respectively.
4. The system for sand-egg formation foundation pit dewatering and excavation construction according to claim 3, characterized in that each drainage opening (13) is matched with a plug (14), and further comprises a communicating pipe (8) connected to the enclosing plate (1) and having an outlet end communicated with the hollow space.
5. The system for sand-egg stratum foundation pit dewatering and excavation construction according to claim 3, characterized in that the connection of the filter screen (16) and the coaming (1) is realized by: the other four surfaces of the coaming (1) are respectively an upper end surface, a lower end surface, a left end surface and a right end surface, and any one of the other four surfaces is connected to the coaming (1) through a bolt;
two chutes which are opposite to each other are arranged on the wall surface of the hollow space of the enclosing plate (1), and the filter screen (16) is clamped in the hollow space through the chutes;
the starting end of the sliding groove is opposite to the surface of the enclosing plate (1) connected with the bolt.
6. A system for sand and gravel formation pit dewatering and excavation according to claim 5, further comprising a support plate (17) disposed within the inner cavity, the filter screen (16) being supported on the support plate (17) as a surface of the inner cavity boundary.
7. The system for sand-gravel stratum foundation pit dewatering and excavation construction according to claim 1, further comprising a support frame for supporting the enclosing plate (1), wherein the support frame comprises a vertical rod (3) and a plurality of cross rods (2) arranged along the axial direction of the vertical rod (3), the cross rods (2) serve as support members between the vertical rod (3) and the inner side of the enclosing plate (1), and the length of the cross rods (2) is adjustable.
8. The system for sand-gravel stratum foundation pit dewatering and excavation construction according to claim 7, wherein the cross rod (2) comprises a threaded cylinder (4) and a threaded rod (5) which are connected in series, the threaded cylinder (4) is in threaded connection and coaxial with the threaded rod (5), the threaded cylinder (4) is connected with the upright rod (3), and a base plate (6) is further arranged between the end of the threaded rod (5) and the inner side of the enclosing plate (1);
the pad (6) comprises: for the first plate body of steel sheet, for the second plate body of plastic slab or graphite plate, for the third plate body of steel sheet, first plate body and threaded rod (5) fixed connection, the centre gripping of second plate body is between first plate body and third plate body, the outside and bounding wall (1) inboard contact of bottom plate body.
9. The system for sand-egg stratum foundation pit dewatering and excavation construction as claimed in claim 7 or 8, further comprising sleeves which are sleeved on the vertical rods (3) and can slide along the axes of the vertical rods (3), wherein two cross rods (2) are fixed on each sleeve, and the cross rods (2) on each sleeve are in line symmetry with respect to the axes of the sleeves;
the locking device is used for realizing the position locking of the sleeve on the axis of the cross rod (2).
10. Method for foundation pit dewatering and excavation in sandy-pebbly ground, characterised in that it is based on a system according to any one of claims 1 to 9, and in that it is carried out by:
s1, arranging a reinforcing mesh (11) serving as a steel structure framework in the concrete wall body on the wall surface of the excavated foundation pit;
s2, arranging a plurality of grouting pipes (10) on the outer wall of the reinforcing mesh (11), wherein the grouting pipes (10) are arranged at intervals, the gap between every two adjacent grouting pipes (10) is used as a fluid circulation channel between the inlet end of the communication hole (15) and the reinforcing mesh (11), a plurality of grouting holes are arranged on each grouting pipe (10) along the axial line, and the openings of the grouting holes face the reinforcing mesh (11);
s3, erecting the coaming (1), wherein the outer wall of the outer side plate is attached to the grouting pipe (10);
s4, in the process of foundation pit excavation and construction, the side surface of the foundation pit is flushed and discharged by using the enclosing plate (1) as a soil-retaining drainage wall, and drainage flow control is realized by adjusting the fluid conduction capacity of the drainage outlet (13);
s5, after foundation pit excavation and construction are completed, concrete or slurry is injected into the reinforcing mesh (11) through the grouting pipe (10), and the coaming (1) is used as a supporting template in the concrete or slurry curing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010758462.5A CN111827297A (en) | 2020-07-31 | 2020-07-31 | System and method for sand-egg stratum foundation pit dewatering and excavation construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010758462.5A CN111827297A (en) | 2020-07-31 | 2020-07-31 | System and method for sand-egg stratum foundation pit dewatering and excavation construction |
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| Publication Number | Publication Date |
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| CN111827297A true CN111827297A (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010758462.5A Pending CN111827297A (en) | 2020-07-31 | 2020-07-31 | System and method for sand-egg stratum foundation pit dewatering and excavation construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216200A (en) * | 2021-04-08 | 2021-08-06 | 河南征信建筑工程有限公司 | Building foundation pit slope protection system and method |
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2020
- 2020-07-31 CN CN202010758462.5A patent/CN111827297A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216200A (en) * | 2021-04-08 | 2021-08-06 | 河南征信建筑工程有限公司 | Building foundation pit slope protection system and method |
| CN113216200B (en) * | 2021-04-08 | 2022-09-30 | 河南征信建筑工程有限公司 | Building foundation pit slope protection system and method |
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