CN111101523B - Reinforced ice supporting device for foundation pit and supporting method adopting same - Google Patents
Reinforced ice supporting device for foundation pit and supporting method adopting same Download PDFInfo
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- CN111101523B CN111101523B CN202010050551.4A CN202010050551A CN111101523B CN 111101523 B CN111101523 B CN 111101523B CN 202010050551 A CN202010050551 A CN 202010050551A CN 111101523 B CN111101523 B CN 111101523B
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- ice
- lateral pressure
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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
- E02D33/00—Testing foundations or foundation structures
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- General Life Sciences & Earth Sciences (AREA)
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- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a reinforced ice supporting device for a foundation pit and a supporting method adopting the device, wherein the reinforced ice supporting device comprises a shell formed by splicing a plurality of side plates and a plurality of lateral pressure maintaining devices which are arranged in the shell and correspond to the side plates, each lateral pressure maintaining device comprises a hydraulic jack, an axial force maintaining push plate and a lateral pressure maintaining plate which are sequentially connected, the lateral pressure maintaining plates of the lateral pressure maintaining devices are connected to form a cavity structure, and reinforced ice and a stress detector arranged in the reinforced ice are filled in the cavity structure. When the device is used for supporting, the stress of a foundation pit supporting structure is predicted firstly, a shell, a hydraulic jack axial force maintaining plate, a lateral force maintaining plate, a stress detection plate and a filling reinforced ice material are sequentially arranged at the broken part of an inner support in a foundation pit, and the shell, the hydraulic jack axial force maintaining plate, the lateral force maintaining plate, the stress detection plate and the filling reinforced ice material are cooled and frozen to provide support. The device tears open and props the process simply, only needs to remove the supply of refrigerant liquid, and the disturbance is less, and is safe and stable.
Description
Technical Field
The invention belongs to the field of foundation pit supporting, and particularly relates to a reinforced ice supporting device for a foundation pit and a supporting method adopting the device.
Background
The foundation pit is an earth pit excavated at a foundation design position according to the base elevation and the base plane size, the deformation of the surrounding soil body is inevitably caused in the excavation process of the foundation pit, the influence is generated on surrounding buildings and underground pipelines, the normal use or safety of the foundation pit is seriously threatened, and particularly, the soil body deformation is easier to occur in the deep foundation pit, so that the common supporting structure in the foundation pit supports and protects the foundation pit.
The traditional foundation pit supporting structure needs to be dismantled after being used, and the inner support is generally cut into sections by adopting a drill bit, a rope saw and other modes when being dismantled and then removed, but because the strength of concrete is high, disturbance is easily generated to the surrounding environment in the concrete cutting process, the stability of foundation pit supporting is influenced, and the safety of surrounding buildings is threatened; meanwhile, the inner concrete support is disposable and cannot be recycled or has low recycling value after being dismantled, so that the construction cost is increased, and the resource utilization rate is reduced.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a reinforced ice supporting device for a foundation pit, which has similar mechanical properties to reinforced concrete, is simple in support dismantling process, small in disturbance to the periphery, safe and stable;
a second object of the invention is to provide a method for supporting with the device.
The technical scheme is as follows: the invention relates to a reinforced ice supporting device for a foundation pit, which comprises a shell formed by splicing a plurality of side plates and a plurality of lateral pressure maintaining devices arranged in the shell and corresponding to the side plates, wherein each lateral pressure maintaining device comprises a hydraulic jack, an axial force maintaining push plate and a lateral pressure maintaining plate which are sequentially connected, the lateral pressure maintaining plates of the lateral pressure maintaining devices are adjacently connected to form a cavity structure, and reinforced ice and a stress detector arranged in the reinforced ice are filled in the cavity structure.
Furthermore, the axial force maintaining push plate of the device is connected with the lateral pressure maintaining plate in a sliding mode through the balls.
Furthermore, a plurality of thermometers are arranged on the side wall of the shell. The side wall of the shell is provided with a plurality of freezing pipes, and the other ends of the freezing pipes extend to the outer side of the shell and are connected with a refrigerating fluid supply device. Preferably, the freezing pipes are distributed along the radial direction of the shell, and a plurality of nozzles are uniformly arranged on the radial pipe wall of the freezing pipes and point to the cavity structure formed by the lateral force maintaining plate.
Further, the axial end of the intensified ice of the present invention is wavy. The end of the lateral pressure maintaining plate is provided with a magnetic head for connection.
The method for supporting the foundation pit by adopting the reinforced ice supporting device for the foundation pit comprises the following steps: and predicting the stress of the foundation pit supporting structure, sequentially mounting a shell, a hydraulic jack, an axial force maintaining plate, a lateral pressure maintaining plate, a stress detector and a filling strengthening ice material at the disconnected part of the inner support of the foundation pit, and forming strengthening ice to provide support after being cooled and frozen.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the mechanical property of the device is similar to that of concrete, but the sensitivity to the stress state is higher than that of the concrete; under the condition of unidirectional compression, the strength range value of the composite ice is within the range of 10-20 MPa, and under the condition of three-dimensional compression (the lateral pressure is the same), the strength range value of the composite ice can be increased to 20-35 MPa under the constraint action of the lateral pressure. Meanwhile, the combined type mounting is adopted, the support dismantling process is simple, only the supply of the refrigerating fluid needs to be removed, the disturbance to the periphery is small, and the combined type mounting is safe and stable; the novel ice-making concrete support can be matched with a pre-supported concrete support for use, can adapt to various application scenes, strengthens materials in ice, is simple and easy to obtain, is green and environment-friendly, and can be repeatedly used. In addition, the method for supporting by adopting the device is simple and has strong operability.
Drawings
FIG. 1 is a schematic view of the overall external structure of the apparatus of the present invention;
FIG. 2 is a schematic view of the internal structure of the apparatus of the present invention;
FIG. 3 is a schematic view of the radial plan structure of the apparatus of the present invention;
FIG. 4 is a schematic side plan view of the device of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.
The reinforced ice supporting device for foundation pit supporting comprises a heat-insulating shell 2 which is a sealing structure with a cavity and formed by splicing a plurality of side plates 1, wherein a heat-insulating layer is arranged inside the heat-insulating shell, and the heat-insulating layer can be a heat-insulating structure such as cold-resistant foam and a vacuum interlayer.
A lateral pressure maintaining device 3 is arranged in the inner cavity of the heat preservation shell 2, as shown in fig. 1 and 2. As shown in fig. 3 and 4, the lateral pressure maintaining device 3 includes a hydraulic jack 4, an axial force maintaining push plate 5 and a lateral pressure maintaining plate 6, the hydraulic jack 4 is fixed in the middle of the inner side wall of the thermal insulation casing 2, the telescopic end of the hydraulic jack is fixed on the axial force maintaining push plate 5, the other side of the axial force maintaining push plate 5 is in sliding contact with the lateral pressure maintaining plate 6, that is, the axial force maintaining push plate 5 is provided with a ball 9, and the volume of the reinforced ice material changes in the process of changing into a solid, so that the shear deformation of the lateral pressure maintaining plate 6 is eliminated by the arrangement of the ball 9, and the axial force of the hydraulic jack 4 can be reliably applied to the surface of the reinforced ice 7, thereby ensuring the lateral constraint condition of the reinforced ice 7. The number of the lateral pressure maintaining plates 6 is the same as that of the side plates 1, and the lateral pressure maintaining plates 6 are connected with each other through magnetic heads 13 arranged at the respective ends to form a polygonal cavity. The liquid jack 4 is used for keeping the stress of the lateral pressure maintaining plate 6 perpendicular to the radial direction, and the axial force maintaining push plate 5 and the ball 13 are used for keeping the relative position between the lateral pressure maintaining plate 6 and the adjacent plate so as to correspond to the position change generated by the volume change of the intensified ice in the polygonal cavity. The polygonal cavity is filled with the reinforced ice 7 with the wavy axial end and a wireless stress detector 8, and the stress detector 8 is arranged in the reinforced ice 7. The stress detectors 8 are at least 5 and distributed at four corners and the middle part in the rectangular cavity and used for monitoring the stress of all positions in the reinforced ice 7 in the polygonal cavity.
Still be equipped with wireless thermoscope 12 and freeze pipe 10 in the inner chamber of heat preservation casing 2, thermoscope 12 all has a plurality of groups with freezing pipe 10 to evenly install on the lateral wall of curb plate 1, freeze pipe 10 along the inner chamber radial distribution of heat preservation casing 2, evenly seted up a plurality of spouts on the radial pipe wall, the directional polygon cavity of spout, its other end extends to the outside of heat preservation casing 2, links to each other with refrigerant liquid feeding mechanism 11. The invention also comprises a control terminal (a PLC control system commonly used in the industry) for regulating and controlling the wireless stress detector 8 and the temperature detector 12, and the control terminal also regulates and controls the working state of the refrigerant liquid supply device 11. It should be noted that, the stress detector 8 and the temperature detector 12 are both arranged wirelessly, and are used for reducing defects in the intensified ice 7, maintaining the sealing performance of the heat preservation housing 2, and transmitting the monitoring result to the control terminal, the temperature detector 12 is used for monitoring the temperature inside the heat preservation housing 2 and in the space outside the polygonal cavity, and the control terminal controls the amount of the refrigerant liquid supplied by the refrigerant liquid supply device 11 through the received stress value, so as to adjust or maintain the stress of the intensified ice 7.
The method for supporting by adopting the device comprises the following steps:
(1) predicting the stress of a foundation pit supporting structure, and designing corresponding reinforced ice;
(2) injecting the refrigerant liquid into the refrigerant liquid supply device 11, and debugging all electronic equipment;
(3) preprocessing the fracture of the concrete inner support 14 to smooth the fracture;
(4) a temperature detector 12 and a freezing pipe 10 are arranged on the side wall of the inner cavity of the heat insulation shell 2, the freezing pipe 10 is kept connected with a refrigerating fluid supply device 11, and a lateral pressure maintaining device 3 is arranged on the side plate 1, so that adjacent lateral pressure maintaining plates 6 are mutually matched to form a polygonal cavity;
(5) laying an elastic plastic film in the polygonal cavity, placing a grid net in the cavity, suspending a stress detector 8 in the cavity through cotton threads, and refilling a reinforced ice material;
(6) after the installation is finished, installing the side plate 1 and keeping the heat-insulating shell 2 closed;
(7) starting a refrigerating fluid supply unit, and injecting refrigerating fluid into the heat-insulating shell through a freezing pipe;
(8) the reinforced ice material is frozen by cooling to form reinforced ice 7, and gradually begins to bear force to provide supporting force;
(9) along with the progress of foundation pit construction, the stress provided by the reinforced ice 7 changes, the stress detector monitors the change of the stress and then feeds the change back to the control terminal, and the control terminal adjusts the input of the refrigerant liquid and the supporting force of the hydraulic jack 4 so as to change the stress provided by the reinforced ice 7;
(10) when the inner support needs to be removed, the supporting device can be removed and recovered through the reverse steps S6-S2.
Before construction, trial calculation is carried out on the axial force of the inner support in the foundation pit, and matched refrigerating fluid is modulated according to the axial force; the purpose of processing the section of the concrete on the inner support into a wave shape is to avoid the crushing of the intensified ice caused by the sharp point of the concrete. The freezing pipe is laid on the inner cavity side wall of the heat insulation shell and is positioned outside the polygonal cavity because: the reinforced ice material is frozen from outside to inside, when the reinforced ice is frozen to the inside in sequence, the water inside the reinforced ice material gradually changes into ice, the volume of the reinforced ice material expands to generate expansion stress, when the inner support bears pressure, the expansion force generated by the reinforced ice needs to be offset firstly, and then the reinforced ice support begins to bear the force, so that the compressive strength of the reinforced ice support is improved. Two ends of an elastic plastic film paved in the polygonal cavity are attached to the end faces of the wavy concrete, and the elastic plastic film has the function of bearing water injected into the polygonal cavity and preventing the leakage of the strengthening ice liquid; the placed grid net is used for improving the strength of the reinforced ice, reducing bubbles in the ice, reducing the damage of stress concentration and also ensuring the quality of the end joint of the reinforced ice. The stress detector monitors the change of the stress value in the reinforced ice, and when the stress value is not in the normal threshold range, the control terminal regulates and controls the input of the refrigerant liquid and the magnitude of the supporting force of the low-temperature hydraulic jack according to the value fed back by the stress detector, so as to change the strength value generated by the reinforced ice; and the constant state is maintained according to the value of the thermometer.
In addition, the ice strengthening material adopted in the invention can be deionized water, or wood chips, high-strength fibers and a liquid thickening agent, and is used for reducing bubbles in water and increasing the strength of ice, and the strength of the frozen strengthened ice is 20-35 Mpa under the low-temperature environment (20-30 ℃) and under the lateral pressure.
Claims (8)
1. The utility model provides a foundation ditch is with reinforceing ice supporting device which characterized in that: the device includes casing (2) that is formed by a plurality of curb plates (1) concatenation and locates in this casing (2), a plurality of lateral pressure maintain device (3) corresponding with curb plate (1), this lateral pressure maintain device (3) including consecutive hydraulic jack (4) that set up, push pedal (5) and lateral pressure maintain board (6) are maintained to axial force, lateral pressure maintain board (6) adjacent connection setting of a plurality of lateral pressure maintain device (3) are in order to form the cavity structure, this cavity structure intussuseption is filled and is set up and strengthen ice (7) and locate stress detector (8) in strengthening ice (7).
2. The reinforced ice support device for foundation pits according to claim 1, wherein: the axial force maintaining push plate (5) is connected with the lateral pressure maintaining plate (6) in a sliding mode through a ball (9).
3. The reinforced ice support device for foundation pits according to claim 1, wherein: the side wall of the shell (2) is provided with a plurality of freezing pipes (10), and the other ends of the freezing pipes (10) extend to the outer side of the shell (2) and are connected with a refrigerating fluid supply device (11).
4. The reinforced ice support device for foundation pits according to claim 3, wherein: the freezing pipes (10) are distributed along the radial direction of the shell (2), and a plurality of nozzles are uniformly arranged on the radial pipe wall of the freezing pipes and point to a cavity structure formed by the lateral pressure maintaining plates (6).
5. The reinforced ice support device for foundation pits according to claim 1, wherein: the side wall of the shell (2) is provided with a plurality of thermometers (12).
6. The reinforced ice support device for foundation pits according to claim 1, wherein: the axial end part of the intensified ice (7) is wavy.
7. The reinforced ice support device for foundation pits according to claim 1, wherein: the end of the lateral pressure maintaining plate (6) is provided with a magnetic head (13) for connection.
8. The method for supporting the foundation pit by using the reinforced ice supporting device for the foundation pit as claimed in claim 1, which is characterized by comprising the following steps of:
(1) predicting the stress of a foundation pit supporting structure, and designing corresponding reinforced ice;
(2) pretreating the fracture of the concrete inner support (14) to smooth the fracture;
(3) installing lateral pressure maintaining devices (3) on the side plates (1) to enable adjacent lateral pressure maintaining plates (6) to be matched with each other to form a polygonal cavity;
(4) laying an elastic plastic film in the polygonal cavity, placing a grid net in the cavity, suspending a stress detector (8) in the cavity through cotton threads, and refilling an intensified ice material;
(5) after the installation is finished, the side plates (1) are continuously installed, and the heat-preservation shell (2) is kept closed;
(6) starting a refrigerating fluid supply unit, and injecting refrigerating fluid into the heat-insulating shell through a freezing pipe;
(7) the reinforced ice material is frozen by cooling to form reinforced ice (7), and gradually begins to be stressed to provide supporting force;
(8) along with the progress of foundation pit construction, stress provided by the reinforced ice (7) changes, the stress detector monitors the change of the stress and feeds the change back to the control terminal, and the control terminal adjusts the input of the refrigerant liquid and the supporting force of the hydraulic jack (4) so as to change the stress provided by the reinforced ice (7);
(9) when the inner support (14) needs to be removed, the supporting device can be removed and recovered through the reverse steps S6-S2.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010050551.4A CN111101523B (en) | 2020-01-17 | 2020-01-17 | Reinforced ice supporting device for foundation pit and supporting method adopting same |
| ZA2020/01994A ZA202001994B (en) | 2020-01-17 | 2020-05-04 | Reinforced ice supporting device for foundation pit and method for supporting through same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010050551.4A CN111101523B (en) | 2020-01-17 | 2020-01-17 | Reinforced ice supporting device for foundation pit and supporting method adopting same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111101523A CN111101523A (en) | 2020-05-05 |
| CN111101523B true CN111101523B (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010050551.4A Active CN111101523B (en) | 2020-01-17 | 2020-01-17 | Reinforced ice supporting device for foundation pit and supporting method adopting same |
Country Status (2)
| Country | Link |
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| CN (1) | CN111101523B (en) |
| ZA (1) | ZA202001994B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4295758A (en) * | 1978-02-10 | 1981-10-20 | Mitsui Engineering And Shipbuilding Co., Ltd. | Working platform for oil drilling operations in ice covered sea areas |
| CN1243162C (en) * | 2003-04-01 | 2006-02-22 | 中国矿业大学 | Underground continuous wall frozen construction method |
| CN101487261B (en) * | 2009-01-21 | 2010-06-09 | 浙江中成建工集团有限公司 | Profiled bar freezing wall foundation ditch combined enclosure method and its structure |
| CN107246023B (en) * | 2017-05-25 | 2019-02-01 | 安徽理工大学 | Tunneltron curtain construction freezing method physical model experiment device and experimental method |
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2020
- 2020-01-17 CN CN202010050551.4A patent/CN111101523B/en active Active
- 2020-05-04 ZA ZA2020/01994A patent/ZA202001994B/en unknown
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| Publication number | Publication date |
|---|---|
| ZA202001994B (en) | 2021-05-26 |
| CN111101523A (en) | 2020-05-05 |
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