CN211285630U - Double-support construction structure for soft foundation deep foundation pit - Google Patents
Double-support construction structure for soft foundation deep foundation pit Download PDFInfo
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- CN211285630U CN211285630U CN201922042549.8U CN201922042549U CN211285630U CN 211285630 U CN211285630 U CN 211285630U CN 201922042549 U CN201922042549 U CN 201922042549U CN 211285630 U CN211285630 U CN 211285630U
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Abstract
The application discloses soft foundation deep basal pit double bracing construction structures, first drilling bored concrete pile is close to one side of foundation ditch, first drilling bored concrete pile encloses city annular hole with the foundation ditch, be equipped with ring group hole sclerosis road in the week of annular hole, be equipped with the protection railing between ring group hole sclerosis road and the foundation ditch, the foundation ditch is by first stage excavation layer, second stage excavation layer and third stage excavation layer, still be equipped with the escape canal in the foundation ditch week, the in-process that the second stage excavation layer was excavated is laid many second drilling bored concrete column piles in the foundation ditch, install the lattice column on the second drilling bored concrete column pile, be equipped with a plurality of concrete supports on the lattice column, concrete support upper berth is equipped with many steel shotcrews, steel shotcrete and first drilling bored concrete column pile fixed connection, be equipped with a plurality of sump pit. The utility model discloses a double track supports construction structures, and the construction is simple, and the security is high, and has effectively protected the environment.
Description
Technical Field
The utility model relates to a hydraulic engineering's technical field especially relates to a soft ground deep basal pit double bracing construction structures.
Background
Along with the improvement of the requirement of coastal areas on urban drainage capacity in recent years, construction of drainage pumping stations is highly emphasized in various places, and because pumping station foundations are deeply excavated, foundation pits need to be supported in order to ensure the safety of surrounding buildings. However, the existing support construction structure is complex, long in construction period, low in safety and large in damage to the environment. Therefore, it is necessary to develop a double-support construction structure for a deep foundation pit of a soft foundation to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art not enough and provide a construction is simple, the security is high, and can the environmental protection's soft ground deep basal pit double bracing construction structures.
Solve the technical problem, the utility model discloses take following technical scheme:
a double-support construction structure of a soft foundation deep foundation pit comprises a first cast-in-situ bored pile and a second high-pressure jet grouting column which are embedded in the foundation pit, the first cast-in-situ bored pile is close to one side of the foundation pit and encloses the foundation pit with an annular pit, a ring pit hardened road is arranged on the circumference of the ring pit, a protective railing is arranged between the ring pit hardened road and the foundation pit, the foundation pit consists of a first stage excavation layer, a second stage excavation layer and a third stage excavation layer, a drainage ditch is also arranged on the periphery of the foundation pit, a plurality of second drilling and column filling piles are laid in the foundation pit in the process of excavating the second stage excavation layer, lattice columns are installed on the second drilling and column filling piles, the lattice column is provided with a plurality of concrete supports, the concrete supports are paved with a plurality of steel supports, the steel supports are fixedly connected with the first drilling and column filling piles, and the foundation pit is internally provided with a plurality of water collecting wells.
The embodiment of the utility model provides a steel shotcrete divides the foundation ditch into first block, second block, third block, fourth block, fifth block, sixth block, seventh block and eighth block, be equipped with first machinery access way in the eighth block, be equipped with second machinery access way in the fifth block, be equipped with main pump house in the sixth block.
The embodiment of the utility model provides a first block, second block, third block, fourth block, fifth block, sixth block, seventh block and eighth block all are equipped with two-layerly, and the thickness on every layer is 1.5-1.9 m.
The embodiment of the utility model provides a slope ratio between arbitrary one adjacent layer in first block, second block, third block, fourth block, fifth block, sixth block, seventh block and the eighth block is 1: 2-4.
The embodiment of the utility model provides a be equipped with the forebay of intaking in the eighth block, be equipped with the intake pond in the seventh block.
The embodiment of the utility model provides a be equipped with first high pressure jet grouting pile in the intake chamber.
The embodiment of the utility model provides a lattice column is connected with U type clamp with the steel shotcrete.
The embodiment of the utility model provides a be equipped with axial force detection module on the steel shotcrete, still be equipped with the voussoir that is used for locking steel shotcrete and lattice column on the rigid support.
The embodiment of the utility model provides a longitudinal gradient in escape canal is 1-5%.
The embodiment of the utility model provides a longitudinal gradient in escape canal is 3%.
The utility model has the advantages that:
the traditional concrete support and the traditional steel support are combined, the soil pressure on one side of the foundation pit is transmitted to the other side through the effect of the reinforced concrete support and the steel support and is kept balanced with the soil pressure on the other side, so that the foundation pit is in a safe state, and the change of the supporting axial force can indirectly reflect the change situation of the soil pressure on two sides of the foundation pit, so that the safe construction can be correctly guided by monitoring the supporting axial force. During the excavation of the foundation pit, the soil pressure on two sides is increased along with the increase of the depth, the soil pressure is transmitted to the enclosure structure through force and is inclined towards the inner side of the foundation pit, after the double-channel support is adopted for opposite supporting, the soil pressure on two sides of the foundation pit is well balanced, the safety is ensured, the reinforced concrete support of the channel can fully exert the stress characteristics of large rigidity and small deformation of materials, and the safety of basement construction, foundation construction, peripheral adjacent buildings, roads, underground pipelines and other public facilities is ensured. The construction of the steel support of the next course is simple, the exposure time of the foundation pit is reduced, and the environment is protected.
Other features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
Drawings
FIG. 1 is a longitudinal section view of a foundation pit excavated in stages in a double-support construction structure of a deep foundation pit of a soft foundation according to the present invention;
FIG. 2 is a plan view of the second stage of excavation of the foundation pit in the double-support construction structure of the deep foundation pit of the soft foundation of the present invention;
FIG. 3 is a longitudinal section of a second stage excavation in the double-support construction structure of the soft foundation deep foundation pit of the present invention;
FIG. 4 is a plan view of the third stage of excavation of the foundation pit in the double-support construction structure of the deep foundation pit of the soft foundation of the present invention;
FIG. 5 is a longitudinal section view of the third stage excavation in the double-support construction structure of the soft foundation deep foundation pit of the present invention;
FIG. 6 is a cross-sectional view of the main pump house foundation support in the construction structure for the double-support of the soft foundation deep foundation pit of the present invention;
FIG. 7 is a sectional view of a supporting structure of a foundation pit of a water inlet pool in the double-support construction structure of the deep foundation pit of the soft foundation;
figure 8 is excavation supporting longitudinal section picture among the soft ground deep basal pit double bracing construction structures.
The figures are numbered:
1. hardening the road by the ring foundation pit; 2. a drainage ditch; 3. excavating a layer in a first stage; 4. excavating a layer at the second stage; 5. excavating a layer in a third stage; 6. a first block; 7. a second block; 8. a third block; 9. a fourth block; 10. a fifth block; 11. a sixth block; 12. a seventh block; 13. an eighth block; 14. roads around the foundation pit; 15. a guard rail; 16. a drainage ditch; 17. a crown beam; 18. a second mechanical access duct; 19. a first mechanical access duct; 20. a water inlet pool; 21. a main pump house; 22. a water inlet forebay; 23. supporting concrete; 24. supporting steel; 25. a soil outlet; 26. a water collecting well; 27. a first high-pressure jet grouting pile; 28. a second high-pressure jet grouting pile; 29. a first drilling and column filling pile; 30. a lattice column; 31. and (5) grouting a pile by using a second drill hole.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.
In the following description, the appearances of the indicating orientation or positional relationship, such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are only for convenience in describing the embodiments and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
Referring to fig. 1-7, a double-support construction structure for a deep foundation pit of a soft foundation provided in an embodiment of the present invention includes a first bored pile 29 and a second high-pressure jet grouting column 28 embedded in the foundation pit, the first bored pile 29 is close to one side of the foundation pit, the first bored pile 29 encloses the foundation pit into an annular pit, a ring pit hardened road 1 is circumferentially provided in the annular pit, a guard rail 15 is provided between the ring pit hardened road 1 and the foundation pit, the foundation pit is composed of a first stage excavation layer 3, a second stage excavation layer 4 and a third stage excavation layer 5, a drainage ditch 2 is further provided circumferentially in the foundation pit, a plurality of second bored pile piles 31 are laid in the foundation pit during excavation of the second stage excavation layer 4, a lattice column 30 is installed on the second bored pile 31, a plurality of concrete supports 23 are provided on the lattice column 30, a plurality of steel supports 24 are laid on the concrete support 23, the steel supports 24 are fixedly connected with a first drilling and column filling pile 29, and a plurality of water collecting wells 26 are arranged in the foundation pit.
The utility model discloses soft ground deep basal pit double bracing construction structures, its double bracing is that traditional concrete support and steel shotcrete combine together, pass through reinforced concrete support and steel shotcrete's effect with foundation ditch one side soil pressure, transmit the opposite side, keep balance with the soil pressure of opposite side, thereby make the foundation ditch be in safe state, the change of supporting shaft power can indirect reaction go out foundation ditch both sides soil pressure change condition, consequently can be through monitoring supporting shaft power, the exact safe construction of guiding. During the excavation of the foundation pit, the soil pressure on the two sides is increased along with the increase of the depth, the soil pressure is transmitted to the enclosure structure through force and is inclined towards the inner side of the foundation pit, and after the double-channel support is adopted for oppositely supporting, the soil pressure on the two sides of the foundation pit is well balanced. To achieve the desired effect. The reinforced concrete support can fully exert the stress characteristics of large rigidity and small deformation of the material, and can ensure the safety of basement construction, foundation construction and peripheral public facilities such as adjacent buildings, roads, underground pipelines and the like. The construction of the steel support of the next course is simple, the applicability is strong, the operation is convenient, the exposure time of the foundation pit is reduced, the timeliness is strong, the steel support can be recycled and reused, and the steel support is economical and environment-friendly.
In this embodiment, the steel support 24 divides the foundation pit into a first block 6, a second block 7, a third block 8, a fourth block 9, a fifth block 10, a sixth block 11, a seventh block 12 and an eighth block 13, wherein a first mechanical access passage 19 is arranged in the eighth block 13, a second mechanical access passage 18 is arranged in the fifth block 10, and a main pump room 21 is arranged in the sixth block 11.
In the present embodiment, the first block 6, the second block 7, the third block 8, the fourth block 9, the fifth block 10, the sixth block 11, the seventh block 12 and the eighth block 13 are all provided with two layers, and the thickness of each layer is 1.5-1.9 m.
In the present embodiment, the gradient ratio between adjacent layers of any one of the first block 6, the second block 7, the third block 8, the fourth block 9, the fifth block 10, the sixth block 11, the seventh block 12, and the eighth block 13 is 1: 2-4.
In this embodiment, a water inlet front pool 19 is disposed in the eighth block 13, and a water inlet pool 20 is disposed in the seventh block 12.
In this embodiment, a first high-pressure jet grouting pile 27 is arranged in the water inlet pool 20.
In this embodiment, a U-shaped clamp is attached to the lattice column 30 and the steel support 24.
In this embodiment, an axial force detection module is disposed on the steel support 24, and a wedge block for locking the steel support 24 and the lattice column 30 is further disposed on the steel support 24.
In this embodiment, the longitudinal slope of the drainage ditch 2 is 1 to 5%.
In the present embodiment, the longitudinal slope of the drainage ditch 2 is 3%.
The embodiment of the utility model provides a still provide the construction method who adopts above-mentioned soft ground deep basal pit double bracing construction structures, specifically include following step:
1. upper support construction
1.1, constructing the bottom die (cushion layer) of the reinforced concrete support beam and the top beam, wherein the method can adopt the methods of filling and tamping the original soil of a foundation pit and covering a nylon film, or can adopt the methods of paving a template, pouring a plain concrete cushion layer, paving a felt and the like.
And 1.2, fixing the reinforced concrete support beam and the side mold of the crown beam by using a pull rod screw, and pre-arching the reinforced concrete support beam according to design requirements.
1.3, the concrete pouring of the reinforced concrete supporting beam and the concrete pouring of the crown beam are carried out simultaneously, and the integrity of a supporting system is ensured.
1.4, in order to ensure the safety of the constructors walking on the supporting beam, iron parts for welding the railings are embedded on two sides of the supporting beam.
1.5, in order to shorten the construction period and enter the earth excavation stage as soon as possible, an early strength agent can be added into the concrete proportioning, the maintenance is enhanced, and the earth excavation can be carried out after the concrete reaches the required strength.
And 1.6, pouring concrete, removing a formwork and maintaining according to the relevant standard requirements, so that the later strength of the concrete is increased.
2. Earth excavation
2.1, the site around the foundation pit is leveled before earth excavation, and the elevation of the leveled site is not higher than the designed elevation.
2.2, during earth excavation, the soil is not allowed to be stored within the range of one time of the pit depth at the edge of the foundation pit, and the stacking load is not more than 30KPa within the range of one time to two times of the pit depth.
And 2.3, in order to reduce the deformation of the enclosure structure and the ground and ensure the construction safety, the excavation of the foundation pit is divided into sections and excavated in layers strictly according to the design requirements of construction organization, the longitudinal excavation of the foundation pit is carried out, the length of each section is consistent with the distance (about 15-20 meters) of a transverse construction joint of the main structure, and the whole length is not excavated at one time synchronously.
And 2.4, in the process of excavating the foundation pit, arranging a water collecting pit and well performing drainage work in the foundation pit.
2.5, when the foundation pit is excavated to the designed position of each support, digging a groove to the bottom of each support at each support setting position, then timely setting supports in the groove and applying support prestress, wherein the temporary space time of the enclosure structure cannot exceed 6 h.
2.6, earth excavation follows the principles of 'layered and segmented excavation, strict over excavation forbidding' and 'support before excavation', and the like, in the soil layer excavation process of each support, the excavation width of each section is required to be controlled within 6m, the section of steel support or the steel inclined strut is installed in time, and prestress is applied.
3. Support construction for lower track
3.1, supporting and erecting time: the steel support and the earth excavation are two close and inseparable processes, and the steel support and the earth excavation are mutually promoted and mutually restricted. How to select a proper support erection time is the key of the whole construction progress. For the main structure, the structure length is longer, the depth is larger, the distance between the upper support and the lower support is about 5 meters generally, and the flow process of the large excavator is facilitated. The excavation length is about 15 meters every time, so a steel support needs to be erected in time when the support position is exposed, and the structure safety is ensured.
3.2, the steel support is erected accurately in place, prestress is applied strictly according to design requirements, the stability of the diagonal brace is particularly paid attention to, during operation of the diagonal brace, each installation link needs to be carefully operated, and meanwhile, the steel purlin also needs to meet the requirements of stability, strength and deformation in the manufacturing and installation processes.
And 3.3, firm connection, and connection construction with the lattice column, the enclosing purlin and the enclosure structure.
3.4, stress application design requirement: the axial force is applied by a gradual and continuous method, and the stress loss cannot be prevented in one step. Meanwhile, when the jack is used for exerting the pre-stress, the force must be larger than the designed pre-stress axial force. After the jack applies the axial force, certain stress loss occurs when the jack is locked by the steel wedge, so that the safety factor is reduced, and therefore, a larger axial force than the prestress is applied at the initial stage of force application to ensure the maintenance of the stress. In actual operation, a force is added in advance, after the steel wedge is installed in place, the axial force is measured and calculated so as to monitor the stress loss in the period, after multiple tests, the stress loss can be measured and calculated approximately, and preparation can be made only in the stress applying process in the later period. Reference is made in particular to the design axial force and pre-axial force table in table 1 below:
table 1:
3.5, the two ends of the support are connected with the steel enclosing purlin, the steel enclosing purlin is required to be closely attached to the enclosing pile, and the steel enclosing purlin is densely filled with fine aggregate concrete in a place with a gap.
3.6, when the steel support is installed, the axis deviation is less than or equal to 5cm, and the bearing capacity of the support joint is ensured to meet the design requirement. The steel support is connected by symmetrically arranging bolts and fastening the bolts in sequence, and meanwhile, in order to prevent the steel support from generating overlarge deflection when axial force is applied, the deflection is corrected to be horizontal before the axial force is applied.
3.7, before the steel support is installed, whether the processed and formed support is vertical or not is checked, and correction is carried out if the processed and formed support is not vertical; the steel support is then mounted on the bracket upper mount and fastened.
3.8, in order to ensure that the diagonal bracing steel enclosing purlin cannot move horizontally when prestress is applied, the diagonal bracing steel enclosing purlin on each layer needs to be provided with anti-shearing stools, and specifically, two anti-shearing stools are arranged on two sides of the center of the diagonal bracing. The position of the shear stool corresponds to the position of the actual cape protecting pile.
It can be understood that the utility model discloses a two-way support construction structure is applicable to soft soil foundation, peripheral building and does not allow the deep basal pit engineering that has great deformation.
The above only is the preferred embodiment of the present invention, not therefore the limit the patent protection scope of the present invention, all applications the equivalent structure transformation made by the contents of the specification and the drawings of the present invention is directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.
Claims (10)
1. A double-channel support construction structure of a soft foundation deep foundation pit is characterized by comprising a first cast-in-place bored pile and a second high-pressure rotary spraying column which are embedded into the foundation pit, wherein the first cast-in-place bored pile is close to one side of the foundation pit, the first cast-in-place bored pile encloses the foundation pit into an annular pit, a ring-shaped pit hardened road is arranged in the circumferential direction of the annular pit, a protective railing is arranged between the ring-shaped pit hardened road and the foundation pit, the foundation pit is composed of a first stage excavation layer, a second stage excavation layer and a third stage excavation layer, a drainage ditch is further arranged in the circumferential direction of the foundation pit, a plurality of second cast-in-place bored piles are laid in the foundation pit in the excavation process of the second stage excavation layer, a lattice column is installed on each second cast-in-place bored pile, a plurality of concrete supports are arranged on the lattice column, a plurality of steel supports are laid on each concrete support, and are fixedly connected with, and a plurality of water collecting wells are arranged in the foundation pit.
2. The soft foundation deep foundation pit double support construction structure of claim 1, wherein the steel support divides the foundation pit into a first block, a second block, a third block, a fourth block, a fifth block, a sixth block, a seventh block and an eighth block, wherein a first mechanical access passage is arranged in the eighth block, a second mechanical access passage is arranged in the fifth block, and a main pump room is arranged in the sixth block.
3. The soft foundation deep foundation pit double-support construction structure as claimed in claim 2, wherein the first block, the second block, the third block, the fourth block, the fifth block, the sixth block, the seventh block and the eighth block are provided with two layers, and the thickness of each layer is 1.5-1.9 m.
4. The soft foundation deep foundation pit double-support construction structure as claimed in claim 2, wherein the gradient ratio between adjacent layers of any one of the first block, the second block, the third block, the fourth block, the fifth block, the sixth block, the seventh block and the eighth block is 1: 2-4.
5. The soft foundation deep foundation pit double-support construction structure as claimed in claim 2, wherein a water inlet forebay is arranged in the eighth block, and a water inlet sump is arranged in the seventh block.
6. The soft foundation deep foundation pit double-support construction structure as claimed in claim 5, wherein a first high-pressure jet grouting pile is arranged in the water intake pool.
7. The soft foundation deep foundation pit double bracing construction structure according to claim 1, wherein the lattice column and the steel bracing are connected with a U-shaped clamp.
8. The soft foundation deep foundation pit double bracing construction structure according to claim 7, wherein the steel bracing is provided with an axial force detection module, and the steel bracing is further provided with a wedge block for locking the steel bracing and the lattice column.
9. The soft foundation deep foundation pit double-support construction structure as claimed in claim 1, wherein the longitudinal slope of the drainage ditch is 1-5%.
10. The soft foundation deep foundation pit double-support construction structure as claimed in claim 9, wherein the longitudinal slope of the drainage ditch is 3%.
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| CN201922042549.8U CN211285630U (en) | 2019-11-21 | 2019-11-21 | Double-support construction structure for soft foundation deep foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113684832A (en) * | 2021-08-26 | 2021-11-23 | 中天建设集团有限公司 | Construction structure and construction method for deep and shallow foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113684832A (en) * | 2021-08-26 | 2021-11-23 | 中天建设集团有限公司 | Construction structure and construction method for deep and shallow foundation pit |
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