CN211873035U - Back pressure system for restraining horizontal displacement of foundation pit support structure - Google Patents
Back pressure system for restraining horizontal displacement of foundation pit support structure Download PDFInfo
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- CN211873035U CN211873035U CN202020410958.9U CN202020410958U CN211873035U CN 211873035 U CN211873035 U CN 211873035U CN 202020410958 U CN202020410958 U CN 202020410958U CN 211873035 U CN211873035 U CN 211873035U
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- reinforced water
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 21
- 230000000452 restraining effect Effects 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 81
- 239000010959 steel Substances 0.000 claims abstract description 81
- 238000009412 basement excavation Methods 0.000 claims description 13
- 238000010276 construction Methods 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 8
- 230000001737 promoting effect Effects 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 9
- 230000006872 improvement Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 210000003205 muscle Anatomy 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model provides a back pressure system for restraining the horizontal displacement of a foundation pit support structure, which relates to the field of foundation pit construction in geotechnical engineering, and is characterized in that a steel bracket, a PVC reinforced water bag and a limiting block are arranged; the steel support is arranged at the bottom of the foundation pit; the outer side edge of the cross beam at the bottom of the steel bracket is limited by a positioning block and is used for realizing the limit of the outer side of the steel bracket in the horizontal direction; the upright columns of the steel support are arranged corresponding to the outer side of the enclosure structure at intervals; the PVC reinforced water bag is arranged between the upright post and the enclosure structure; the lower end of the PVC reinforced water bag is arranged on the inner side edge of the cross beam. This application is at the in-service use in-process, and it is little to take up an area of, and stability is high, and the back pressure is highly big, and the back pressure load is big, and the construction is simple and convenient, swift, economical and practical, and application scope is wide, is fit for extensively promoting.
Description
Technical Field
The utility model relates to a foundation ditch construction field among the geotechnical engineering specifically is a restraint foundation ditch retaining structure horizontal displacement's back pressure system.
Background
When the excavation area of the foundation pit is large, a large-area horizontal supporting system is arranged, and meanwhile, more vertical supporting piles and supporting columns need to be arranged, so that the construction period and the construction cost are influenced. At present, when the excavation area of a foundation pit is large, a scheme of reserving counter-pressure soil in a surrounding enclosing structure of the foundation pit is gradually adopted. The reserved back pressure soil is an excavation mode of firstly excavating the earthwork in the middle part of the foundation pit and then excavating the earthwork around the retaining wall, the supporting dosage is small, the cost is low, and the method is suitable for excavating the large-area foundation pit with large foundation pit area and support. The back pressure soil can strengthen or replace a pit bottom supporting system, and the purposes of controlling or reducing the displacement and the internal force of the supporting structure, shortening the embedding depth of the supporting structure and reducing the construction cost are achieved.
However, the reserved soil needs to occupy a certain space, and there may not be enough space to implement the reserved soil back pressure in a limited environment. As is known, the horizontal displacement is a safety control parameter of the enclosure structure in the foundation pit construction process, and if a novel counter-pressure measure can be adopted to reduce the horizontal displacement of the enclosure structure, the safety and the reliability of the foundation pit enclosure structure can be greatly improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a retrain foundation ditch envelope horizontal displacement's back pressure system in order to remedy prior art's defect.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a back pressure system for restraining horizontal displacement of a foundation pit support structure comprises a steel support, a PVC reinforced water bag and a limiting block;
the steel support is arranged at the bottom of the foundation pit; the outer side edge of the cross beam at the bottom of the steel bracket is limited by a positioning block and is used for realizing the limit of the outer side of the steel bracket in the horizontal direction; the upright columns of the steel support are arranged corresponding to the outer side of the enclosure structure at intervals; the PVC reinforced water bag is arranged between the upright post and the enclosure structure; the lower end of the PVC reinforced water bag is arranged on the inner side edge of the cross beam.
As a further improvement of the utility model, a baffle is also arranged; the baffle is arranged between the upright post and the PVC reinforced water bag.
As a further improvement of the utility model, the baffle is of a plate body structure; the two side plate surfaces of the baffle are respectively abutted to the upright post and the PVC reinforced water bag.
As a further improvement of the utility model, the limiting block is made of I-shaped steel; the I-shaped steel is abutted and limited with the bottom end of the outer side of the cross beam.
As a further improvement of the utility model, a steel cable is also arranged; one end of the steel cable is bound with the top of the steel support, and the other end of the steel cable is connected with the fixing pile after bypassing the baffle and the PVC reinforced water bag, so that the steel support, the baffle and the PVC reinforced water bag are limited at the top.
As a further improvement, the PVC adds the height and the foundation ditch excavation degree of depth phase-match of muscle water pocket.
As a further improvement, the PVC reinforced water bag is also provided with a pressurizing device, and the pressurizing device is arranged inside the PVC reinforced water bag.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the occupied area is small. Compared with a traditional reserved soil back pressure system, the method and the device are applicable to foundation pit engineering in a limited environment.
2. The stability is high. In order to prevent the steel bracket from sliding, I-shaped steel is uniformly and alternately driven into the outer side of the steel bracket to form anti-sliding constraint on the steel bracket; and the upper part of the steel bracket is fixed by a steel cable, so that the stability of a back pressure system is greatly improved.
3. The back pressure is high. The height of the lifted water sac counter pressure system can be equal to the excavation depth of the foundation pit, so that the enclosure structure can bear horizontal load in the whole range.
4. The back pressure load is large. The closed PVC reinforced water bag is pressurized, so that a large pressure is generated in the water body (one part is generated by the self weight of the water body), a large horizontal load is generated to act on the enclosure structure, and the horizontal displacement of the enclosure structure is greatly reduced.
5. The application range is wide. The water bag is made of flexible materials, can adapt to various convex-concave uneven structures on the outer vertical surface of the enclosure structure, and is tightly contacted with the outer vertical surface of the enclosure structure under the action of water pressure, so that horizontal load can be effectively transmitted to the enclosure structure.
6. The construction is simple and convenient and fast. Pumping water (or utilizing reclaimed water) in rivers and lakes and filling the water bags with the water bags, so that the requirement on construction equipment is low, the construction space is not occupied, the construction is simple, and the environment is not polluted; when the water bag is removed subsequently, the water is pumped away.
7. Is economical and practical. Large-scale construction machinery is not needed, all-weather operation can be performed, and convenience and rapidness are realized; all the accessories can be used repeatedly, and the cost is low.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
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 is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a back pressure system.
Fig. 2 is a schematic diagram of horizontal pressure generated by the self weight of the water bag water body.
Fig. 3 is a schematic diagram of horizontal pressure generated by pressurizing the inside of a water body of a water bag.
Fig. 4 is a three-dimensional schematic view of the back pressure system of the present invention.
FIG. 5 is a schematic view of the assembled steel bracket, baffle, and water bladder.
Fig. 6 is a schematic view of an explosion structure of the steel bracket, the baffle plate and the water bag.
Fig. 7 is a schematic structural view of a steel bracket.
The reference numbers in the figures illustrate: 1. an enclosure structure; 2. a steel bracket; 3. a PVC reinforced water bag; 4. a baffle plate; 5. i-shaped steel; 6. a steel cord; 7. fixing the pile; A. the original ground; B. and (5) the bottom of the foundation pit.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
With reference to fig. 1 to 7, the utility model provides a restrain foundation ditch envelope horizontal displacement's backpressure system.
Specifically, with reference to fig. 1, fig. 2, fig. 3 and fig. 4, the water-saving device comprises a steel bracket 2, a PVC reinforced water bag 3 and a limiting block;
the steel bracket 2 is arranged at the bottom of the foundation pit; the outer side edge of the cross beam at the bottom of the steel bracket 2 is limited by a positioning block and is used for realizing the limit of the outer side of the steel bracket 2 in the horizontal direction; the upright columns of the steel bracket 2 are arranged corresponding to the outer side of the enclosure structure 1 at intervals; the PVC reinforced water bag is arranged between the upright post and the enclosure structure; the lower end of the PVC reinforced water bag is arranged on the inner side edge of the cross beam.
With reference to fig. 5, 6 and 7, a baffle 4 is further provided; the baffle 4 is arranged between the upright post and the PVC reinforced water bag 3.
Preferably, the baffle 4 is of a plate body structure; the both sides face of baffle 4 respectively with stand and 3 butts of PVC muscle water pocket can realize the stand passes through baffle 4 right PVC adds the even pressure of applying of muscle water pocket 3.
Preferably, the baffle is made of thin steel plate and can be recycled.
Preferably, the limiting block is an I-shaped steel 5; the I-steel 5 with the bottom butt in the crossbeam outside is spacing to this realization is right the fender of crossbeam connects spacingly, can effectively avoid the outside removal of bottom of steel support 2.
A steel cable 6 is also arranged; one end of the steel cable 6 is bound with the top of the steel bracket 2, and the other end of the steel cable is connected with the fixing pile 7 after bypassing the baffle 4 and the PVC reinforced water bag, so that the top of the steel bracket 2, the baffle 4 and the PVC reinforced water bag 3 is limited; and the fixing pile 7 is arranged outside the deformation influence range of the foundation pit excavation soil body. Based on the common constraint of the I-shaped steel 5 and the steel cable 6, the stability of the steel bracket 2 is protected, so that the horizontal acting force of the PVC reinforced water bag 3 can be borne.
The steel bracket 2 is formed by welding or bolting steel plates. The width of the water-filled PVC reinforced water bag 3 between the baffle 4 and the enclosure structure 1 is not more than 50cm due to the restraint of the steel bracket 2.
With reference to fig. 2, the horizontal stress acting on the building envelope is shown in the figure; when the PVC reinforced water bag 3 is not additionally pressurized, the pressure of the water bag is generated by the self-weight stress of water. The horizontal load (stress) at the top of the foundation pit is 0kPa, the horizontal load at the bottom of the foundation pit, namely the water pressure, is rho gh kPa (rho is the density of water, g is the gravity acceleration, and h is the excavation depth of the foundation pit).
Preferably, the PVC reinforced water bag 3 is made of rubber; has the characteristics of light weight, high strength, high flexibility, good wear resistance, good weather resistance, low cost and the like. The height of the PVC reinforced water bag 3 is matched with the excavation depth of the foundation pit, and after the PVC reinforced water bag 3 is filled with water, two sides of the PVC reinforced water bag are respectively abutted to the baffle 4 and the enclosure structure 1; the PVC reinforced water bag 3 is sealed after being filled with water, and equipment is used for pressurizing the water body in the PVC reinforced water bag, so that extra water body pressure is generated.
With reference to fig. 3, when the PVC reinforced water bag 3 is additionally pressurized, the pressure of the water bag is generated by the combination of the self-weight stress of water and the additional pressure, and the horizontal stress acting on the enclosure structure is as shown in the figure. The horizontal load (stress) at the top of the foundation pit is P kPa, and the horizontal load at the bottom of the foundation pit, namely the water pressure, is (P + rho gh) kPa (P is the pressure generated by additional pressurization).
In another embodiment, a pressurizing device is further arranged, and the pressurizing device is arranged inside the PVC reinforced water bag 3. If extra pressurization needs to be carried out on the PVC reinforced water bag 3, the pressurizing device is placed into the PVC reinforced water bag 3 in advance, and the pressurizing device is started after sealing, so that extra pressure different from the self-weight stress of the water body is generated in the PVC reinforced water bag 3. The magnitude of the extra pressure is comprehensively determined according to the strength of the water bag and the excavation depth of the foundation pit.
The construction method of the back pressure system for restraining the horizontal displacement of the foundation pit support structure comprises the following steps:
s1, preparing materials such as a steel bracket 2, a PVC reinforced water bag 3, a baffle 4, I-shaped steel 5, a steel cable 6 and the like in advance and corresponding construction machinery;
s2, placing the steel support 2 at a designed position at the bottom of a foundation pit to be provided with a back pressure system, and driving I-shaped steel 5 into the outer side of the steel support 2 at uniform intervals to prevent the steel support 2 from horizontally sliding;
s3, closely attaching the baffle 4 to the upright post of the steel bracket 2 close to one side of the envelope 1, placing the PVC reinforced water bag 3 between the baffle 4 and the envelope 1, and filling the PVC reinforced water bag 3 with water to be full;
s4, in the process of filling water into the PVC reinforced water bag 3, binding a steel cable 6 at the top of the steel bracket 2, fixing the other end of the steel cable 6 on a fixed pile 7, and arranging the fixed pile 7 outside the deformation influence range of the foundation pit excavation soil body;
and S5, after the PVC reinforced water bag 3 is filled with water and is full, sealing the water inlet. If extra pressurization needs to be carried out on the PVC reinforced water bag 3, the pressurizing device is placed into the PVC reinforced water bag 3 in advance, and the pressurizing device is started after sealing, so that extra pressure different from the self-weight stress of the water body is generated in the PVC reinforced water bag 3. The magnitude of the extra pressure is comprehensively determined according to the strength of the water bag and the excavation depth of the foundation pit;
s6, after the construction is finished, discharging water from the PVC reinforced water bag 3, and then disassembling and collecting the steel bracket 2, the PVC reinforced water bag 3, the baffle 4, the I-shaped steel 5 and the steel cable 6 to prepare for the next reuse
It should be noted that, in the application process, a good technical effect is obtained, which includes:
1. the occupied area is small. The total occupied area width of the back pressure system is less than 1.0m, and the method is suitable for foundation pit engineering in a limited environment. The width of the traditional reserved soil back pressure system is often difficult to be smaller than 2.5m, and the smaller the width is, the smaller the height is, and the poorer the back pressure effect is.
2. The stability is high. In order to prevent the steel bracket from sliding, I-shaped steel is uniformly and alternately driven into the outer side of the steel bracket to form anti-sliding constraint on the steel bracket; and the upper part of the steel bracket is fixed by a steel cable, so that the stability of a back pressure system is greatly improved.
3. The back pressure is high. The height of the water bag back pressure system can be equal to the excavation depth of the foundation pit, so that the enclosure structure can bear horizontal load in the whole range, which is difficult to realize by the existing back pressure method.
4. The back pressure load is large. The closed PVC reinforced water bag 3 is pressurized, so that a large pressure is generated in the water body (one part is generated by the self weight of the water body), a large horizontal load is generated to act on the enclosure structure, and the horizontal displacement of the enclosure structure is greatly reduced.
5. The application range is wide. The water bag is made of flexible materials, can adapt to various convex-concave uneven structures on the outer vertical surface of the enclosure structure, and is tightly contacted with the outer vertical surface of the enclosure structure under the action of water pressure, so that horizontal load can be effectively transmitted to the enclosure structure.
6. The construction is simple and convenient and fast. Pumping water (or utilizing reclaimed water) in rivers and lakes and filling the water bags with the water bags, so that the requirement on construction equipment is low, the construction space is not occupied, the construction is simple, and the environment is not polluted; when the water bag is removed subsequently, the water is pumped away.
7. Is economical and practical. Large-scale construction machinery is not needed, all-weather operation can be performed, and convenience and rapidness are realized; all the accessories can be used repeatedly, and the cost is low.
Only show the partial shape and the partial connected mode of the back pressure system of restraint foundation ditch envelope horizontal displacement in the attached drawing, according to the thinking that puts forward, can change the shape and the connected mode of each component, form the back pressure system that utilizes water pressure to form of other relevant types, it all belongs to the utility model discloses an equivalent modification and change, no longer give consideration to here.
The drawings are for illustrative purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted; the same or similar reference numerals correspond to the same or similar parts; the terms describing the positional relationship in the drawings are for illustrative purposes only and are not to be construed as limiting the present invention.
The present invention is not limited to the above-mentioned embodiments, and according to the above-mentioned contents, according to the common technical knowledge and the conventional means in the field, without departing from the basic utility model idea of the present invention, the present invention can also make other equivalent modifications, replacements or changes in various forms, all falling within the protection scope of the present invention.
Claims (7)
1. The utility model provides a restraint foundation ditch envelope horizontal displacement's back pressure system which characterized in that: comprises a steel bracket, a PVC reinforced water bag and a limiting block;
the steel support is arranged at the bottom of the foundation pit; the outer side edge of the cross beam at the bottom of the steel bracket is limited by a positioning block and is used for realizing the limit of the outer side of the steel bracket in the horizontal direction; the upright columns of the steel support are arranged corresponding to the outer side of the enclosure structure at intervals; the PVC reinforced water bag is arranged between the upright post and the enclosure structure; the lower end of the PVC reinforced water bag is arranged on the inner side edge of the cross beam.
2. The backpressure system of restraining horizontal displacement of foundation pit enclosure structure of claim 1, wherein: a baffle is also arranged; the baffle is arranged between the upright post and the PVC reinforced water bag.
3. The backpressure system of restraining horizontal displacement of foundation pit enclosure structure of claim 2, wherein: the baffle is of a plate body structure; the two side plate surfaces of the baffle are respectively abutted to the upright post and the PVC reinforced water bag.
4. The backpressure system of restraining horizontal displacement of foundation pit enclosure structure of claim 1, wherein: the limiting block is made of I-shaped steel; the I-shaped steel is abutted and limited with the bottom end of the outer side of the cross beam.
5. The backpressure system of restraining horizontal displacement of foundation pit enclosure structure of claim 2, wherein: a steel cable is also arranged; one end of the steel cable is bound with the top of the steel support, and the other end of the steel cable is connected with the fixing pile after bypassing the baffle and the PVC reinforced water bag, so that the steel support, the baffle and the PVC reinforced water bag are limited at the top.
6. The backpressure system of restraining horizontal displacement of foundation pit enclosure structure of claim 1, wherein: the height of the PVC reinforced water bag is matched with the excavation depth of the foundation pit.
7. The backpressure system of restraining horizontal displacement of foundation pit enclosure structure of claim 1, wherein: and the PVC reinforced water bag is also provided with a pressurizing device, and the pressurizing device is arranged inside the PVC reinforced water bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020410958.9U CN211873035U (en) | 2020-03-27 | 2020-03-27 | Back pressure system for restraining horizontal displacement of foundation pit support structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020410958.9U CN211873035U (en) | 2020-03-27 | 2020-03-27 | Back pressure system for restraining horizontal displacement of foundation pit support structure |
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| CN211873035U true CN211873035U (en) | 2020-11-06 |
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| CN202020410958.9U Expired - Fee Related CN211873035U (en) | 2020-03-27 | 2020-03-27 | Back pressure system for restraining horizontal displacement of foundation pit support structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287200A (en) * | 2020-03-27 | 2020-06-16 | 中煤第三建设（集团）有限责任公司 | Back pressure system for restraining horizontal displacement of foundation pit support structure and construction method thereof |
-
2020
- 2020-03-27 CN CN202020410958.9U patent/CN211873035U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287200A (en) * | 2020-03-27 | 2020-06-16 | 中煤第三建设（集团）有限责任公司 | Back pressure system for restraining horizontal displacement of foundation pit support structure and construction method thereof |
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