CN218757519U - Deep foundation pit support structure considering isolating underground confined water - Google Patents
Deep foundation pit support structure considering isolating underground confined water Download PDFInfo
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- CN218757519U CN218757519U CN202223047260.3U CN202223047260U CN218757519U CN 218757519 U CN218757519 U CN 218757519U CN 202223047260 U CN202223047260 U CN 202223047260U CN 218757519 U CN218757519 U CN 218757519U
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Abstract
The utility model relates to a deep basal pit retaining structure of underground confined water is cut off in consideration, including the retaining structure main part, the back up coat at the bottom of the hole, add water proof back up coat and hole interior drainage well, wherein the retaining structure main part sets up the border position at deep basal pit, and the back up coat setting is at the bottom of the hole of deep basal pit, and additional water proof back up coat sets up in the bottom of the hole below of back up coat and lie in among the bearing water layer of retaining structure main part within range, and the drainage well setting is in the hole and the bottom lies in among the bearing water layer in the deep basal pit, and the drainage well is connected with groundwater automatic monitoring drainage system in the hole. The utility model has the advantages that: the water-resisting measures and the automatic monitoring dewatering system for the water-resisting reinforcing layers are arranged at the bottom of the pit, so that the problem that the earth penetration depth of the enclosure structure is too large in the current deep foundation pit design is solved, the water-resisting property of the foundation pit is improved to the maximum extent, the underground water level of the foundation pit can be measured and controlled, the construction cost is greatly reduced, and a large number of social resources are saved.
Description
Technical Field
The utility model belongs to the technical field of foundation ditch engineering technique and specifically relates to a consider deep basal pit retaining structure who cuts off secret confined water.
Background
Underground continuous walls are mostly adopted as an enclosure structure for deep foundation pits in cities. When a pressure-bearing water layer exists at the bottom of a foundation pit, in order to cut off underground water, usually, an underground continuous wall needs to be inserted into a waterproof stratum below the pressure-bearing water layer, so that the design of a foundation pit support structure is controlled by the sudden surge of the pressure-bearing water layer, but not the stability of the foundation pit and the deformation of the support structure, the insertion ratio (the ratio of the soil penetration depth to the excavation depth of the foundation pit) of the underground continuous wall is very large, for example, the design of a deep foundation pit in a soft soil area of the upper sea is taken as an example, the design depth of the underground continuous wall of the foundation pit with the excavation depth of about 30m usually reaches 60-70m, so that the construction cost is very high, and the great social resource waste is caused.
Therefore, how to optimally design the deep foundation pit enclosure structure in the city on the premise of ensuring the engineering safety, namely how to reasonably design the insertion ratio and the water-proof measure of the underground diaphragm wall, and adopting corresponding monitoring and drainage methods become a problem to be solved urgently in the design of the current deep foundation pit engineering enclosure structure.
Disclosure of Invention
The utility model aims at providing a deep basal pit retaining structure who considers to cut off secret confined water according to above-mentioned prior art not enough, through the multilayer water proof structure of foundation ditch bottom, effectively reduced underground continuous wall's design degree of depth to assist and carry out real time monitoring and automatic drainage to the end of a pit water level with foundation ditch water level automatic monitoring system, ensure construction safety.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
the utility model provides a consider to cut off deep basal pit retaining structure of secret confined water for carry out the enclosure to the deep basal pit, the below of deep basal pit has confined water layer and impervious bed, impervious bed is located the below of confined water layer, its characterized in that: the deep foundation pit support structure comprises a support structure main body, a pit bottom reinforcing layer, an additional water-resisting reinforcing layer and a pit internal drainage well, wherein the support structure main body is arranged at the boundary position of the deep foundation pit, the pit bottom reinforcing layer is arranged at the pit bottom of the deep foundation pit, the additional water-resisting reinforcing layer is arranged below the pit bottom reinforcing layer and is located in the range of the support structure main body among the pressure-bearing water layer, the pit internal drainage well is arranged in the deep foundation pit, the bottom end of the pit is located in the pressure-bearing water layer, and the pit internal drainage well is connected with an underground water automatic monitoring drainage system.
Two or more than two additional waterproof reinforcing layers are arranged in the pressure-bearing water layer in the range of the enclosure structure main body, and the additional waterproof reinforcing layers are arranged at intervals.
And a water-resisting layer is arranged outside the pit of the deep foundation pit, and the bottom surface of the water-resisting layer corresponds to the bottom surface of the deep foundation pit.
And an outer-pit standby drainage well is arranged outside the pit of the deep foundation pit, the outer-pit standby drainage well is connected with the underground water automatic monitoring drainage system, and the bottom end of the outer-pit standby drainage well is positioned in the pressure-bearing water layer.
And an off-pit water level observation well is arranged outside the pit of the deep foundation pit, the off-pit water level observation well is connected with the underground water automatic monitoring drainage system, and the bottom end of the off-pit water level observation well is positioned in the pressure-bearing water layer.
And a water recharging well is arranged outside the pit of the deep foundation pit, and the bottom end of the water recharging well is positioned in the pressure water bearing layer.
The utility model has the advantages that: the water-proof measures of the water-proof reinforcing layers and the automatic monitoring precipitation system are arranged at the bottom of the pit, so that the problem that the depth of the enclosure structure in the current deep foundation pit design is too large is solved, the water-proof performance of the foundation pit is improved to the maximum extent, the underground water level of the foundation pit can be measured and controlled, the construction cost is greatly reduced, and a large number of social resources are saved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the present invention in practice;
fig. 3 is a flow chart of the present invention in application.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of examples to facilitate understanding by those skilled in the art:
as shown in fig. 1-3, the symbols 1-11 in the figures are respectively expressed as: the underground continuous wall 1, the pit bottom reinforcing layer 2, the additional waterproof reinforcing layer 3, the pit outer water level observation well 4, the pit inner drainage well 5, the pit outer spare drainage well 6, the underground water automatic monitoring drainage system 7, the recharge water well 8, the pressure-bearing water layer 9, the impermeable layer 10 and the impermeable layer 11.
Example (b): as shown in fig. 1 to 3, in the embodiment, the deep foundation pit enclosure structure for isolating the underground confined water is used for enclosing the deep foundation pit, and the multilayer water isolation structure is arranged at the bottom of the deep foundation pit, so that the design depth of the underground diaphragm wall 1 serving as the enclosure structure main body is effectively reduced, and meanwhile, an underground water automatic monitoring and drainage system can be used for real-time monitoring and automatic drainage to ensure the construction safety.
Specifically, as shown in fig. 1, the deep foundation pit in the present embodiment is disposed above the layer of confined water 9 and the impermeable layer 10, which is disposed below the layer of confined water 9. The underground continuous wall 1 is used as a main body of the enclosure structure, and the underground continuous wall 1 is arranged at the boundary position of the deep foundation pit and is used for supporting and blocking soil outside the pit; the underground diaphragm wall 1 is inserted into the layer of pressurized water 9 at the bottom.
The pit bottom strengthening layer 2 is arranged at the pit bottom of the deep foundation pit, and the pit bottom strengthening layer 2 is used for strengthening the pit bottom of the deep foundation pit, resisting the uplift of a soil body at the pit bottom and ensuring the stability of the deep foundation pit enclosure structure, and is used for partitioning a pressure-bearing water layer 9. Two additional waterproof reinforcing layers 3 are arranged below the pit bottom reinforcing layer 2, and the two additional waterproof reinforcing layers 3 are arranged at intervals and are positioned in a pressure-bearing water layer 9 in the range enclosed by the underground continuous wall 1; the additional waterproof reinforcing layer 3 is used for partitioning the confined water layer 9 in cooperation with the pit bottom reinforcing layer 2.
In this embodiment, both the pit bottom reinforcing layer 2 and the additional water-resisting reinforcing layer 3 can be used to reinforce the soil at the pit bottom and the soil below the pit bottom by using the MJS method, high-pressure jet grouting reinforcement, or other methods.
As shown in fig. 1, a drainage system is further configured in the deep foundation pit support structure of this embodiment, and the drainage system, the pit bottom reinforcing layer 2 and the additional waterproof reinforcing layer 3 are jointly used, so that the water level at the pit bottom can be effectively isolated, monitored in real time and automatically drained, and the construction safety is ensured.
The drainage system comprises an outside-pit water level observation well 4, an inside-pit drainage well 5, an outside-pit standby drainage well 6, an underground water automatic monitoring drainage system 7 and a recharge water well 8. The pit internal drainage well 5 and the pit external spare drainage well 6 are respectively used for realizing drainage of a pressure-bearing water layer 9; the in-pit drainage well 5 is provided in an area in the pit of the deep foundation pit surrounded by the underground diaphragm walls 1, and the out-of-pit backup drainage well 6 is provided in an area outside the deep foundation pit. The water level observation well 4 outside the pit is arranged outside the deep foundation pit and is used for observing the underground water level of the confined water layer 9. The recharge water well 8 is arranged outside the deep foundation pit, and when the underground water level is too low, the recharge water well 8 can recharge water to the pressure-bearing water layer 9 so as to ensure that the underground water level is controllable. The underground water automatic monitoring and drainage system 7 is respectively connected with the water level observation well 4 outside the pit, the drainage well 5 inside the pit and the spare drainage well 6 outside the pit, and the underground water automatic monitoring and drainage system 7 can control the drainage well 5 inside the pit and/or the spare drainage well 6 outside the pit to automatically drain the pressure-bearing water layer 9 in or around the deep foundation pit according to the current underground water level measured by the water level observation well 4 outside the pit.
In this embodiment, the various components of the drainage system may be implemented using well-established equipment in the art. For example, the water level sensor is arranged in the well pipe of the off-pit water level observation well 4, the water level sensor can monitor the underground water level condition in real time, then the water level sensor sends monitoring data to the underground water automatic monitoring drainage system 7 in a wireless signal transmission or wired transmission mode, the underground water automatic monitoring drainage system 7 is provided with a controller, and when the monitored underground water level exceeds a certain set value, the in-pit drainage well 5 and/or the off-pit backup drainage well 6 are controlled to start working, namely underground water of the pressure-bearing water layer 9 is pumped and drained; along with the pumping and drainage of the underground water, the water level sensor in the water level observation well 4 outside the pit monitors that the underground water level gradually drops below a set value or a set value in real time, and then the automatic underground water monitoring and drainage system 7 can control the drainage well 5 in the pit and the standby drainage well 6 outside the pit to stop working, so that the automatic drainage in the foundation pit or around the foundation pit is realized. The pit internal drainage well 5 and the pit external backup drainage well 6 have a well pipe and a suction pump provided in the well pipe, and may be provided with a filter layer or the like for improving the use effect.
In some cases, the recharging water well 8 can also realize automatic recharging in an automatic mode according to the monitoring data of the water level observation well 4 outside the pit; for example, a recharging water tank is arranged at the recharging water well 8, and when the underground water level is detected to be lower than a critical value, the underground water automatic monitoring and draining system 7 controls a water pump in the recharging water tank to start working, and recharging water to the pressure water layer 9 through a well pipe of the recharging water well 8.
As shown in fig. 1, in this embodiment, in order to ensure the drainage effect and further avoid the deformation of the soil outside the deep foundation pit; and a water-resisting layer 11 is arranged below each well pipe outside the pit, and the water-resisting layer 11 corresponds to the bottom surface of the deep foundation pit. The water level observation well 4 outside the pit, the spare drainage well 6 outside the pit and the reinjection water well 8 respectively penetrate through the water-resisting layer 11 and enter the pressure-bearing water layer 9 below.
In the present embodiment, as shown in fig. 2 and fig. 3, the following construction methods are included:
1) The underground diaphragm wall 1 is designed according to a design method of an anti-uplift stability safety coefficient considering the shape and the plane size of the foundation pit.
2) And (5) dewatering the foundation pit by using the drainage well 5 in the pit.
3) And when the foundation pit is excavated to the pit bottom, the pit bottom reinforcing layer 2 is constructed by using cement soil mixing piles or high-pressure jet grouting and other methods.
4) And (3) constructing the additional waterproof layer 3 under the pit bottom reinforcing layer by using cement soil mixing piles or high-pressure jet grouting and other methods.
5) And constructing a water level observation well 4 outside the pit and a standby dewatering well 6 outside the pit, connecting the water level observation well and the standby dewatering well with an underground water automatic monitoring and drainage system 7, and carrying out real-time observation and drainage on the periphery of the foundation pit and the water level in the pit.
6) The automatic monitoring and drainage system of the foundation pit automatically determines a precipitation control index according to the size of the foundation pit, soil parameters and maintenance structure information, controls precipitation operation of a precipitation well until the water level and the water pressure reach target values, and monitors the change of the water level and the water pressure in construction in real time.
7) And after the foundation pit construction is finished, carrying out groundwater recharge operation by using a recharge well 8.
Although the foregoing embodiments have been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the claims, and further description is not necessary here.
Claims (6)
1. The utility model provides a consider to cut off deep basal pit retaining structure of secret confined water for carry out the enclosure to the deep basal pit, the below of deep basal pit has confined water layer and impervious bed, impervious bed is located the below of confined water layer, its characterized in that: the deep foundation pit support structure comprises a support structure main body, a pit bottom reinforcing layer, an additional water-resisting reinforcing layer and a pit internal drainage well, wherein the support structure main body is arranged at the boundary position of the deep foundation pit, the pit bottom reinforcing layer is arranged at the pit bottom of the deep foundation pit, the additional water-resisting reinforcing layer is arranged below the pit bottom reinforcing layer and is located in the range of the support structure main body among the pressure-bearing water layer, the pit internal drainage well is arranged in the deep foundation pit, the bottom end of the pit is located in the pressure-bearing water layer, and the pit internal drainage well is connected with an underground water automatic monitoring drainage system.
2. The deep foundation pit enclosure structure considering isolating underground confined water as claimed in claim 1, wherein: two or more than two additional waterproof reinforcing layers are arranged in the pressure-bearing water layer in the range of the enclosure structure main body, and the additional waterproof reinforcing layers are arranged at intervals.
3. The deep foundation pit enclosure structure considering isolating underground confined water as claimed in claim 1, wherein: and a water-resisting layer is arranged outside the pit of the deep foundation pit, and the bottom surface of the water-resisting layer corresponds to the bottom surface of the deep foundation pit.
4. The deep foundation pit support structure considering to cut off underground confined water according to claim 1, characterized in that: and an outer-pit standby drainage well is arranged outside the pit of the deep foundation pit, the outer-pit standby drainage well is connected with the underground water automatic monitoring drainage system, and the bottom end of the outer-pit standby drainage well is positioned in the pressure-bearing water layer.
5. The deep foundation pit enclosure structure considering isolating underground confined water as claimed in claim 1, wherein: and an off-pit water level observation well is arranged outside the pit of the deep foundation pit, the off-pit water level observation well is connected with the underground water automatic monitoring drainage system, and the bottom end of the off-pit water level observation well is positioned in the pressure-bearing water layer.
6. The deep foundation pit enclosure structure considering isolating underground confined water as claimed in claim 1, wherein: and a water recharging well is arranged outside the pit of the deep foundation pit, and the bottom end of the water recharging well is positioned in the pressure water bearing layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223047260.3U CN218757519U (en) | 2022-11-16 | 2022-11-16 | Deep foundation pit support structure considering isolating underground confined water |
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| CN202223047260.3U CN218757519U (en) | 2022-11-16 | 2022-11-16 | Deep foundation pit support structure considering isolating underground confined water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118531778A (en) * | 2024-07-18 | 2024-08-23 | 上海建工一建集团有限公司 | Construction method of pit bottom bored pile combining depressurization and weight |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118531778A (en) * | 2024-07-18 | 2024-08-23 | 上海建工一建集团有限公司 | Construction method of pit bottom bored pile combining depressurization and weight |
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