CN213038391U - Miniature pile structure for accelerating pit-to-pit construction speed of deep foundation pit - Google Patents
Miniature pile structure for accelerating pit-to-pit construction speed of deep foundation pit Download PDFInfo
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- CN213038391U CN213038391U CN202021923526.4U CN202021923526U CN213038391U CN 213038391 U CN213038391 U CN 213038391U CN 202021923526 U CN202021923526 U CN 202021923526U CN 213038391 U CN213038391 U CN 213038391U
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Abstract
The utility model discloses a miniature pile structure of pit construction speed in deep basal pit with higher speed, include: a high elevation toe support system, a micro pile support system and an external-protection and internal-sticking-prevention waterproof system; the high-elevation slope toe supporting system is formed by driving soil nails in a high-elevation high-slope toe soil body, hanging a reinforcing mesh and spraying cement mortar; the miniature pile supporting system comprises profile steel and a cement wall, and the miniature pile supporting system is welded and connected with the high-grade high slope toe supporting system through steel bars arranged between the profile steel and soil nails in a pulling mode; the external-protection and internal-sticking waterproof system comprises a brick bed die and a waterproof coiled material. The utility model can effectively solve the problem that the construction progress of the position with higher elevation is greatly influenced by the construction progress of the position with lower elevation when the pit-in-pit structure is constructed; the construction noise and vibration are small, and the method is particularly suitable for deep foundation pits with high construction sensitivity in the surrounding environment and pit-in-pit projects of non-deep foundation pits.
Description
Technical Field
The utility model belongs to the technical field of the building engineering construction, a miniature pile structure of hole construction speed in deep basal pit accelerates is provided very much.
Background
With the acceleration of the pace of large and medium-sized city construction, the gradual shortage of urban land and the wild rise of land cost, ultrahigh and ultra-deep projects gradually become the mainstream of city construction, and the projects usually adopt structural forms such as a frame-core barrel, a barrel-in-barrel and the like, so that the structural bottom elevation of a core barrel region is often lower than that of a skirt building region, a structural form of a pit-in-pit is formed, and the excavation depth often exceeds 5 m.
At present, the construction mode of a pit-in-pit structure with the difference of height between the inside and the outside of a core cylinder being greater than 5m is usually constructed according to the working procedures of firstly lowering and then raising, the economic effect is considered, the support mode is usually constructed in a slope-releasing support mode, and the construction progress of the position with higher elevation is greatly influenced by the construction progress of the position with lower elevation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a miniature pile structure of hole construction speed in deep basal pit with higher speed, when mainly used solved the hole structure construction of digging, the construction progress at the higher position of elevation receives the construction progress at the lower position of elevation to influence great problem.
The technical scheme of the utility model is that: a micro pile structure for accelerating the construction speed of a pit in a deep foundation pit comprises: a high elevation toe support system 1, a micro pile support system 2 and an external-prevention and internal-sticking-prevention waterproof system 3; the high-elevation slope toe supporting system 1 is formed by punching soil nails 1a in a high-elevation high-slope toe soil body, hanging a reinforcing mesh 1b and spraying cement mortar 1 c; the miniature pile supporting system 2 comprises section steel 2a and a cement wall 2b, and the miniature pile supporting system 2 is connected with the high-grade high slope toe supporting system 1 in a welding mode through a steel bar 2c arranged between the section steel 2a and a soil nail 1a in a pulling mode; outer waterproof system 3 of preventing sticking in includes brick bed mould 3a and waterproofing membrane 3b, mainly used supplementary low elevation position 5's basement lateral wall's waterproof construction, when high, need with the miniature pile strut between the system 2 through the reinforcing bar drawknot.
Furthermore, the soil nails 1a are arranged at the position of a high-grade high toe along the toe in the horizontal direction and the vertical direction at intervals of 2m, and the diameter of the soil nails 1a is 20-25 mm.
Further, the specification of the reinforcing mesh sheet 1b is as follows
Further, the section steel 2a is 20# I-steel.
Furthermore, the cement wall 2b is made of P. O42.5R ordinary portland cement, the water cement ratio is 0.50-0.60, the strength is not lower than 20MPa, and no less than 12h of intermittent time is reserved between normal pressure grouting and high pressure grouting.
Further, the diameter of the steel bar 2c is 8 mm.
The utility model discloses following profitable effect has:
the utility model can effectively solve the problem that the construction progress of the position with higher elevation is greatly influenced by the construction progress of the position with lower elevation when the pit-in-pit structure is constructed; the construction noise and vibration are small, and the method is particularly suitable for deep foundation pits with high construction sensitivity in the surrounding environment and pit-in-pit projects of non-deep foundation pits.
The utility model discloses the construction generally will be with synchronous or alternate construction such as excavation supporting engineering or earth anchor engineering, and the required machinery of construction and material are machinery or materials commonly used such as excavation supporting engineering or earth anchor engineering, and worker, material, machine and construction cost divide alone the subcontracting with low costs.
The utility model discloses the flexibility is stronger, and construction method is simple, does benefit to and uses widely in the similar project that has simplification process, reduction of erection time requirement.
Drawings
FIG. 1 is a schematic plan view of the present invention;
FIG. 2 is a node diagram of the present invention;
in the figure: 1. a high elevation toe support system; 1a, soil nailing; 1b, reinforcing steel bar meshes; 1c, spraying cement mortar; 2. a micro pile support system; 2a, profile steel; 2b, cement walls; 2c, reinforcing steel bars; 3. an external waterproof and internal waterproof system; 3a, brick moulding bed; 3b, waterproof coiled materials; 4. a high elevation part; 5. a low elevation part.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, a micro pile structure for accelerating the construction speed of a pit in a deep foundation pit comprises: a high elevation toe support system 1, a micro pile support system 2 and an external-prevention and internal-sticking-prevention waterproof system 3; the high-elevation slope toe supporting system 1 is formed by driving soil nails 1a in a high-elevation high-slope toe soil body, hanging a reinforcing mesh 1b and spraying cement mortar 1 c; the micro pile supporting system 2 comprises section steel 2a and a cement wall 2b, and the micro pile supporting system 2 is welded with the high-grade high slope toe supporting system 1 through a steel bar 2c arranged between the section steel 2a and a soil nail 1a in a pulling mode; the external-protection and internal-sticking-prevention waterproof system 3 comprises a brick bed die 3a and a waterproof coiled material 3b, is mainly used for assisting the waterproof construction of the side wall of the underground chamber at the low elevation part 5, and needs to be tied with the micro pile supporting system 2 through reinforcing steel bars when the height is higher.
The utility model discloses well miniature pile support system 2 is under construction according to the construction order of high elevation position 4 toe spray anchor support → down-the-hole drill drilling → shaped steel handling and installation → drilling position ordinary pressure slip casting → stew → high pressure slip casting.
The utility model discloses well high elevation toe support system 1 is for along the toe level to reaching vertical every 2m and beating at high elevation toe position and establish the diameter and be 20mm ~ 25mm soil nail 1a to hang and establish
And spraying cement mortar 1c to seal after the reinforcing mesh sheet 1 b.
The utility model discloses miniature pile supporting system 2 is formed by installing shaped steel 2a and the combination of cement wall 2b that is formed through ordinary pressure slip casting and high pressure slip casting after the down-the-hole drill pore-forming, wherein, shaped steel 2a adopts the 20# I-steel that impression and quality are good, need to do the rust cleaning before the use and accept to be qualified through the inspection; the cement used for the construction of the cement wall 2b is P. O42.5R ordinary portland cement, the water cement ratio is preferably 0.50-0.60, the strength is not lower than 20MPa, and no less than 12h of intermittent time is reserved between normal pressure grouting and high pressure grouting.
In order to ensure the integral rigidity of the micro pile when the structure at the higher part 4 of the elevation is constructed in advance, 8mm steel bars 2c are pulled and welded between the micro pile profile steel 2a and the soil nails 1a after the micro pile is constructed.
The utility model discloses well external defense is interior to paste waterproof system 3 is built by M5 cement mortar by the cement brick that the specification is 190mm x 90mm x 50mm, the wall body top and face the low elevation basement structure lateral wall outside and need adopt M15 cement mortar to plaster and make level, and glue waterproofing membrane 3b in some points on bottom plate bed course and brick moulding bed lateral wall screed after making level and accomplish, waterproofing membrane 3b should be the same with bed course waterproof material, can adopt 3mm thick self-adhesion polymer modified asphalt waterproofing membrane; when the brick moulding bed 3a is built by laying bricks or stones highly and is higher than 1.5m, should follow highly pre-buried diameter and be 8 mm's logical long reinforcing bar, form the reinforced brick layer with building the mortar layer, the reinforced brick layer reinforcing bar is drawn with miniature stake cantilever section along length and direction of height and is established 8mm steel bar welded connection.
The utility model discloses C15 plain concrete should be pour between system 2 to well high elevation toe is strutted system 1 and miniature stake, provides the working face for 4 follow-up constructions in high elevation position in advance, and miniature stake is strutted system 2 and is prevented closely between the interior waterproof system 3 of pasting outward, and the space between the two is under construction in step when pouring the concrete in the low elevation position V basement lateral wall, and for guaranteeing the closure of outer wall waterproof layer, should be slightly more than once pouring the wall body height in the interior waterproof system 3 of pasting outward.
The utility model discloses can adjust the use according to the actual conditions, this embodiment only explains briefly the construction thinking under the specific conditions.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (6)
1. The utility model provides a miniature stake structure of pit construction speed in accelerating deep basal pit which characterized in that includes: a high elevation slope toe supporting system (1), a micro pile supporting system (2) and an external-prevention and internal-sticking-prevention waterproof system (3); the high-elevation slope toe supporting system (1) is formed by drilling soil nails (1a) in a high-elevation slope toe soil body, hanging a steel bar net piece (1b) and spraying cement mortar (1 c); the miniature pile supporting system (2) comprises section steel (2a) and a cement wall (2b), and the miniature pile supporting system (2) is connected with the high-grade high slope foot supporting system (1) in a welding mode through a steel bar (2c) arranged between the section steel (2a) and a soil nail (1a) in a pulling mode; the external-protection and internal-sticking waterproof system (3) comprises a brick mould (3a) and a waterproof coiled material (3 b).
2. The micro pile structure for accelerating the construction speed of the pit in the deep foundation pit is characterized in that the soil nails (1a) are arranged at the position of a high-grade high toe along the horizontal direction and the vertical direction of the toe every 2m, and the diameter of the soil nails (1a) is 20 mm-25 mm.
3. The micro pile structure for accelerating the speed of pit construction in a deep foundation pit according to claim 1, wherein the reinforcing mesh (1b) has a specification of Φ 6@200 x 200.
4. The micro pile structure for accelerating the speed of pit-in-pit construction according to claim 1, wherein the section steel (2a) is 20# i-steel.
5. The micro pile structure for accelerating the speed of pit-in-pit construction according to claim 1, wherein the cement wall (2b) is made of P O42.5R ordinary portland cement, the strength is not lower than 20MPa, and no less than 12h of intermittent time is reserved between normal pressure grouting and high pressure grouting.
6. A micropile structure for accelerating the speed of pit-in-pit construction in a deep foundation pit according to claim 1, wherein said reinforcing bars (2c) have a diameter of 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021923526.4U CN213038391U (en) | 2020-09-07 | 2020-09-07 | Miniature pile structure for accelerating pit-to-pit construction speed of deep foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021923526.4U CN213038391U (en) | 2020-09-07 | 2020-09-07 | Miniature pile structure for accelerating pit-to-pit construction speed of deep foundation pit |
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| CN213038391U true CN213038391U (en) | 2021-04-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081114A (en) * | 2020-09-07 | 2020-12-15 | 中国建筑第四工程局有限公司 | Miniature pile structure for accelerating pit-to-pit construction speed of deep foundation pit |
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- 2020-09-07 CN CN202021923526.4U patent/CN213038391U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112081114A (en) * | 2020-09-07 | 2020-12-15 | 中国建筑第四工程局有限公司 | Miniature pile structure for accelerating pit-to-pit construction speed of deep foundation pit |
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