CN212896381U - Subway tunnel foundation pit bottom pressing bottom plate structure - Google Patents
Subway tunnel foundation pit bottom pressing bottom plate structure Download PDFInfo
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- CN212896381U CN212896381U CN202021452512.9U CN202021452512U CN212896381U CN 212896381 U CN212896381 U CN 212896381U CN 202021452512 U CN202021452512 U CN 202021452512U CN 212896381 U CN212896381 U CN 212896381U
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Abstract
The utility model provides a subway tunnel foundation pit bottom pressing plate structure, which comprises a cast-in-place pressing plate and a prefabricated pressing plate, wherein the prefabricated pressing plate is laid firstly, and then the cast-in-place pressing plate is poured; after the prefabricated plate connecting ribs are firmly connected through the inter-plate fastening bolts, pouring construction of the inter-plate reinforcement is carried out; leading holes from the inner side wall of the support pile to the soil body around the pile, inserting the grouting anchor pipe into the soil body around the pile, grouting the grouting anchor pipe through an external grouting equipment part, and forming anchoring grouting body around the grouting anchor pipe in the soil body around the pile; firstly, carrying out drainage cushion layer construction on the upper surface of a pit bottom soil body, then carrying out binding construction of the longitudinal ribs of the bottom plate and the stirrups of the bottom plate, and firmly connecting the post-positioned anchor ribs with the longitudinal ribs of the bottom plate through anchor rib connecting bolts. The utility model discloses can promote joint strength and structural integrity between the prefabricated plate, improve site operation quality and efficiency.
Description
Technical Field
The utility model relates to a foundation ditch supporting engineering among the underground works, in particular to can promote joint strength and structural integrity between prefabricated plate, improve the subway tunnel foundation ditch pit bottom pressure bottom plate structure of site operation quality and efficiency.
Background
During excavation and construction of a subway foundation pit, various problems in stability control are often involved under the influence of safety control of the surrounding environment, and for the problems, in order to ensure smooth implementation of engineering construction, the excavation and support technology and the construction technology of the foundation pit are often optimized and improved.
In the prior art, a latticed reinforcing method for the bottom of a foundation pit in a soft soil area is provided, and a non-reinforced area which does not need to take reinforcing measures is divided in the foundation pit; reinforcing the soft soil in the latticed reinforced area; and excavating the foundation pit to the designed pit bottom. According to the technology, the pit bottom is reinforced in a partitioned mode, the bottom plate of the pit bottom is still integrally cast, and the site construction efficiency and the integrity of the bottom plate structure are difficult to effectively improve.
In view of this, in order to improve the construction quality and efficiency of a foundation pit excavation supporting system, the invention of the subway tunnel foundation pit bottom pressing bottom plate structure capable of improving the overall stability of the structure and improving the construction quality and efficiency is urgently needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a not only can promote the stability of foundation ditch structure, can promote cast-in-place pressure bottom plate's closely knit degree moreover, can also improve structural integrity's subway tunnel foundation ditch hole end pressure bottom plate structure.
For the purpose above of realizing, this technical scheme provides a subway tunnel foundation ditch hole end pressure bottom plate structure, and wherein the subway tunnel foundation ditch is surrounded by a fender pile and forms, and a fender pile avris is equipped with the all soil body of stake, and subway tunnel foundation ditch bottom side is equipped with the hole end soil body, includes: the integral connecting plate, the rear anchor bar, the pit bottom pressing bottom plate, the drainage cushion layer, the bottom plate longitudinal bar, the bottom plate stirrup, the top die position control connecting plate and the bottom pressing plate top die; the integral connecting plate is connected to one side, close to the foundation pit, of the support pile, the rear anchor bars are arranged from the integral connecting plate to the support pile in a driving mode, the top side of the integral connecting plate is provided with a top die position control connecting plate, and the top die position control connecting plate is connected with a bottom plate top die through a top die position control bolt; the drainage bed course is arranged on the upper surface of the soil body at the bottom of the pit, the longitudinal ribs of the bottom plate are bound with the stirrups of the bottom plate and are arranged in a space between the drainage bed course and the top die of the bottom pressing plate, the longitudinal ribs of the bottom plate are connected with the postposition anchor ribs, and the bottom pressing plate at the bottom of the pit is arranged between the top die of the bottom pressing plate and the drainage bed course.
In some embodiments, the pit bottom pressure plate comprises a cast-in-place pressure plate and a prefabricated pressure plate, the cast-in-place pressure plate is arranged on the inner side of the support pile along the circumferential direction, and the prefabricated pressure plate is arranged in an annular space formed by the cast-in-place pressure plate in an enclosing mode.
In some embodiments, the integral tie plate is connected to the support pile by anchor pipe bolts.
In some embodiments, the cross section of the integral connecting plate is circular arc, the central angle is 45-60 degrees, and holes for the grouting anchor pipe and the rear anchor bar to penetrate are arranged on the integral connecting plate.
In some embodiments, the top die position control link plate is vertically connected to the top die position control link plate, and the bottom of the top die position control link plate is vertically connected to the bottom plate top die.
In some embodiments, the prefabricated press bottom plate is provided with connecting steps on the periphery, a joint connecting tenon and a joint mortise are arranged on the lower step of the prefabricated press bottom plate, prefabricated plate connecting ribs are arranged on the upper step of the prefabricated press bottom plate, and an inter-plate reinforcing rib connected with a bottom plate longitudinal rib or a bottom plate hoop rib is arranged on the lower step connected with the cast-in-situ press bottom plate.
In some embodiments, the joint tenon and the joint mortise are isosceles trapezoid in cross section, and the joint tenon and the joint mortise are respectively arranged on two parallel surfaces of the prefabricated pressing bottom plate.
Compared with the prior art, the technical scheme has the following beneficial effects:
(1) the utility model discloses a mud jacking anchor pipe and anchor mud jacking body will integral even board and a fender pile firm in connection to accessible anchor bar connecting bolt indulges the muscle with the bottom with rearmounted anchor bar and is connected one wholly, can reduce the concentrated stress at seam position by a wide margin, strengthens the wholeness of structure.
(2) The utility model discloses a top mould accuse position is tied and is injectd the vertical position of pressure bottom plate top mould, can exert the overdraft to concreting, promotes cast-in-place pressure bottom plate's closely knit degree.
(3) The utility model discloses the pressure bottom plate includes cast-in-place pressure bottom plate and prefabricated pressure bottom plate at the bottom of the hole, makes cast-in-place pressure bottom plate locate a fender pile's inboard along the hoop, sets up prefabricated pressure bottom plate in cast-in-place pressure bottom plate encloses the annular space that closes formation, can promote site operation efficiency by a wide margin.
(4) The utility model discloses set up seam tenon and seam tongue-and-groove on prefabricated pressure bottom plate to set up prefabricated plate connection and inter-plate reinforcement between the prefabricated pressure bottom plate that meets, can promote joint strength and the structural integrity between the prefabricated plate.
Drawings
FIG. 1 is a plan view of the arrangement of the cast-in-place pressure plate and the prefabricated pressure plate of the utility model;
FIG. 2 is a schematic view of a construction structure of the cast-in-place impression floor of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the grouting anchor pipe of FIG. 1;
FIG. 4 is a schematic view of the connection structure between the prefabricated baseplates of FIG. 1;
fig. 5 is a schematic cross-sectional view of the pre-pressed floor of fig. 1.
In the figure: 1-supporting a pile; 2-pressing the bottom plate at the bottom of the pit; 3-casting a pressure bottom plate in situ; 4-soil body around the pile; 5, prefabricating a bottom pressing plate; 6-grouting anchor pipes; 7-connecting steps; 8-anchoring the grouting body; 9-anchor pipe bolts; 10-integral tie-plates; 11-post anchor bars; 12 pit bottom soil body; 13-a drainage blanket; 14-longitudinal ribs of the bottom plate; 15-base plate stirrup; 16-anchor bar connecting bolt; 17-interplate obturation; 18-top mould position control connecting plate; 19-a top mold position control bolt; 20-pressing a bottom plate top die; 21-fastening bolts between plates; 22-precast slab connecting ribs; 23-an interplate reinforcement; 24-seam joint tenons; 25-joint mortises; 26-reinforcing ribs between plates; 27-slurry hydraulic outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only 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 all belong to the protection scope of the present invention.
The rolling and welding construction technical requirement of shaped steel, bolt-up construction technical requirement, fender pile construction technical requirement, on-the-spot hoist and mount construction technical requirement, concrete placement construction technical requirement etc. no longer give unnecessary details in this embodiment, the key explanation the utility model relates to an embodiment of method.
Fig. 1 is the utility model discloses cast-in-place pressure bottom plate and prefabricated pressure bottom plate lay plan, and fig. 2 is the cast-in-place pressure bottom plate construction structure schematic diagram of fig. 1, and fig. 3 is the anchor pipe cross-section schematic diagram of fig. 1, and fig. 4 is the prefabricated inter-plate connection structure schematic diagram of pressing bottom plate of fig. 1, and fig. 5 is the prefabricated inter-plate cross-section schematic diagram of pressing bottom plate of fig. 1.
Referring to fig. 2-5, the bottom pressing plate structure at the bottom of the subway tunnel foundation pit, wherein the subway tunnel foundation pit is surrounded by the support piles 1, the side of the support pile 1 is provided with the soil body 4 around the pile, and the bottom of the subway tunnel foundation pit is provided with the soil body 12 at the bottom of the pit, including:
the structure comprises an integral connecting plate 10, a rear anchor bar 11, a pit bottom pressing bottom plate 2, a drainage cushion layer 13, a bottom plate longitudinal bar 14, a bottom plate stirrup 15, a top die position control connecting plate 18 and a bottom pressing plate top die 20;
the integral connecting plate 10 is connected to one side, close to a foundation pit, of the support pile 1, the rear anchor bars 11 are arranged from the integral connecting plate 10 to the support pile 1, the top side of the integral connecting plate 10 is provided with a top die position control connecting plate 18, and the top die position control connecting plate 18 is connected with a bottom plate top die 20 through a top die position control bolt 19;
the drainage cushion layer 13 is arranged on the upper surface of the pit bottom soil body 12, the bottom plate longitudinal ribs 14 are bound with the bottom plate stirrups 15 and are arranged in a space between the drainage cushion layer 13 and the pressing bottom plate top die 20, the bottom plate longitudinal ribs 14 are connected with the rear anchor ribs 11, and the pit bottom pressing bottom plate 2 is arranged between the pressing bottom plate top die 20 and the drainage cushion layer 13.
The pit bottom pressure bottom plate 2 comprises a cast-in-place pressure bottom plate 3 and a prefabricated pressure bottom plate 5, the prefabricated pressure bottom plate 5 is constructed firstly, then pouring construction of the cast-in-place pressure bottom plate 3 is carried out, the cast-in-place pressure bottom plate 3 is arranged on the inner side of the supporting pile 1 along the circumferential direction, and the prefabricated pressure bottom plate 5 is arranged in an annular space formed by enclosing the cast-in-place pressure bottom plate 3.
Specifically, the inner side wall of the support pile 1 is provided with a hole which penetrates into the soil body 4 around the pile, the grouting anchor pipe 6 is inserted into the hole, the grouting anchor pipe 6 is grouted through the external grouting equipment part, and the anchoring grouting body 8 is formed around the grouting anchor pipe 6 in the soil body 4 around the pile. The grouting anchor pipe 6 is formed by rolling a steel pipe, and a grouting hydraulic outlet 27 is formed in the side wall of the grouting anchor pipe and connected with the support pile 1 in a grouting mode.
The integral connecting plate 10 is connected with the support pile 1 through the anchor pipe bolt 9, namely, the anchor pipe bolt 9 penetrates through the integral connecting plate 10 to be inserted into the support pile 1. In addition, a post-anchor bar 11 is also connected between the integral connecting plate 10 and the support pile 1.
Correspondingly, the cross section of the integral connecting plate 10 is arc-shaped, the central angle is 45-60 degrees, holes for the grouting anchor pipe 6 and the rear anchor bar 11 to penetrate through are formed in the integral connecting plate 10, and the integral connecting plate is vertically welded and connected with the top die position control connecting plate 18.
The top mold position-controlling connecting plate 18 is vertically connected to the top mold position-controlling connecting plate 18, and the bottom of the top mold position-controlling connecting plate 18 is vertically connected to the bottom plate top mold 20. The top die position control bolt 19 is formed by screw rolling and is connected with the top die position control connecting plate 18 through threads.
The rear anchor bar 11 is formed by rolling a steel pipe or a steel bar, is welded with the integral connecting plate 10, and is connected with the bottom plate longitudinal bar 14 through an anchor bar connecting bolt 16.
The prefabricated pressure bottom plate 5 is prefabricated by reinforced concrete materials, the periphery of the prefabricated pressure bottom plate is provided with connecting steps 7, a seam connecting tenon 24 and a seam mortise 25 are arranged on the lower step of the prefabricated pressure bottom plate 5, a prefabricated plate connecting rib 22 is arranged on the upper step of the prefabricated pressure bottom plate 5, and an inter-plate reinforcing rib 26 connected with a bottom plate longitudinal rib 14 or a bottom plate stirrup 15 is arranged on the lower step connected with the cast-in-place pressure bottom plate 3.
The cross sections of the joint connecting tenon 24 and the joint mortise 25 are isosceles trapezoids, the joint connecting tenon 24 and the joint mortise 25 are respectively arranged on two mutually parallel surfaces of the prefabricated pressing bottom plate 5, and the joint connecting tenon 24 and the joint mortise 25 are matched in shape to realize the connection of the prefabricated pressing bottom plate 5.
Specifically, the construction method of the subway tunnel foundation pit bottom pressing bottom plate structure comprises the following steps:
firstly, constructing a drainage cushion layer 13 on the upper surface of a pit bottom soil body 12, then, binding construction of a bottom plate longitudinal rib 14 and a bottom plate stirrup 15, firmly connecting a post-positioned anchor rib 11 with the bottom plate longitudinal rib 14 through an anchor rib connecting bolt 16, firstly, laying construction of a prefabricated pressing bottom plate 5 according to the plane position requirement of the prefabricated pressing bottom plate 5, arranging an inter-plate airtight body 17 at a vertical joint of a lower-layer step of the prefabricated pressing bottom plate 5, limiting the position of a pressing bottom plate top mold 20 through a top mold position control bolt 19 on a top mold position control connecting plate 18, then, pouring construction of a cast-in-place pressing bottom plate 3, and pouring construction of an inter-plate reinforcing body 23 after firmly connecting prefabricated plate connecting ribs 22 through an inter-plate fastening bolt 21.
The support pile 1 comprises a separation pile and a circumferential pile, and is a concrete cast-in-place pile with the diameter of 1000mm, wherein the separation pile is used for separating an excavation block, and the circumferential pile is arranged along the circumferential direction of a foundation pit to be excavated.
The cast-in-place pressure bottom plate 3 is formed by pouring concrete with the strength grade of C35, and the thickness is 30 cm; the prefabricated pressing bottom plate 5 is prefabricated by adopting reinforced concrete materials, and the thickness is 30 cm; the periphery of the prefabricated pressure bottom plate 5 is provided with connecting steps 7, the heights of the lower step and the upper step are 15cm, the lower step is provided with a joint tenon 24 and a joint mortise 25, the upper step is provided with a prefabricated plate connecting rib 22, the lower step connected with the cast-in-place pressure bottom plate 3 is provided with an inter-plate reinforcing rib 26 connected with a bottom plate longitudinal rib 14 or a bottom plate stirrup 15, the width of a middle platform of the connecting step 7 is 100mm, the prefabricated plate connecting rib 22 and the inter-plate reinforcing rib 26 are respectively formed by rolling a screw rod with the diameter of 30mm and a threaded steel bar with the diameter of 32mm, and the bottom plate longitudinal rib 14 and the bottom plate stirrup 15 are respectively formed by threaded ribbed steel bars with the diameter of 32mm and threaded ribbed steel bars with the diameter of 10 mm.
The cross sections of the joint tenon 24 and the joint mortise 25 are isosceles trapezoids, the top width is 10cm, the bottom width is 20cm, and the height is 5 cm.
The soil body 4 around the pile is sandy soil in a medium density state.
The anchoring grout 8 is made of cement mortar.
The anchor pipe bolt 9 is composed of a high-strength screw rod with the diameter of 30mm and a bolt.
The integral connecting plate 10 is formed by rolling a steel plate with the thickness of 10mm, the cross section of the integral connecting plate is in a circular arc shape, the central angle of the integral connecting plate is 60 degrees, and holes for the grouting anchor pipes 6 and the rear anchor bars 11 to penetrate are formed in the integral connecting plate 10 and are vertically welded and connected with the top die position control connecting plate 18. Wherein, the top mould position control connecting plate 18 is formed by rolling a steel plate with the thickness of 10mm, the mud jacking anchor pipe 6 is a steel pipe with the inner diameter of 60mm, a mud hydraulic outlet 27 is arranged on the side wall of the mud jacking anchor pipe, the outer surface of the mud hydraulic outlet is connected with the support pile 1 through glue injection, and the diameter of the mud hydraulic outlet 27 is 20 mm.
The rear anchor bar 11 is formed by rolling a screw rod with the diameter of 30mm, is welded with the integral connecting plate 10, is connected with the bottom plate longitudinal bar 14 through an anchor bar connecting bolt 16, and the anchor bar connecting bolt 16 adopts a nut matched with the rear anchor bar 11.
The drainage cushion layer 13 is made of medium coarse sand material and has the thickness of 10 cm.
The interpanel closing body 17 is formed by cutting a rubber plate with the thickness of 10 mm.
The top die position control bolt 19 is formed by rolling a screw rod with the diameter of 30mm and is connected with the top die position control connecting plate 18 through threads.
The pressing bottom plate top die 20 is formed by rolling a steel plate with the thickness of 3 mm.
The inter-plate fastening bolt 21 adopts a nut matched with the precast slab connecting rib 22.
The inter-plate reinforcement 23 is formed by pouring self-compacting impermeable concrete with the strength grade of C35.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.
Claims (8)
1. The utility model provides a subway tunnel foundation pit presses bottom plate structure at bottom of hole, wherein the subway tunnel foundation pit is surrounded by fender pile (1) and forms, and fender pile (1) avris is equipped with all soil bodies (4) of stake, and subway tunnel foundation pit bottom side is equipped with the bottom of the hole soil body (12), its characterized in that includes:
the device comprises an integral connecting plate (10), a rear anchor bar (11), a pit bottom pressing bottom plate (2), a drainage cushion layer (13), a bottom plate longitudinal bar (14), a bottom plate stirrup (15), a top die position control connecting plate (18) and a bottom pressing plate top die (20);
wherein the integral connecting plate (10) is connected to one side of the support pile (1) close to the foundation pit, the rear anchor bar (11) is arranged from the integral connecting plate (10) to the support pile (1), the top side of the integral connecting plate (10) is provided with a top die position control connecting plate (18), and the top die position control connecting plate (18) is connected with a bottom plate top die (20) through a top die position control bolt (19);
the drainage cushion layer (13) is arranged on the upper surface of the pit bottom soil body (12), the bottom plate longitudinal ribs (14) and the bottom plate stirrups (15) are bound and arranged in a space between the drainage cushion layer (13) and the bottom pressing plate top die (20), the bottom plate longitudinal ribs (14) are connected with the rear anchor ribs (11), and the pit bottom pressing plate (2) is arranged between the bottom pressing plate top die (20) and the drainage cushion layer (13).
2. The underground tunnel foundation pit bottom pressure bottom plate structure of claim 1, characterized in that, the underground tunnel foundation pit bottom pressure bottom plate (2) comprises a cast-in-place pressure bottom plate (3) and a prefabricated pressure bottom plate (5), the cast-in-place pressure bottom plate (3) is arranged at the inner side of the supporting pile (1) along the circumferential direction, and the prefabricated pressure bottom plate (5) is arranged in the annular space formed by the cast-in-place pressure bottom plate (3).
3. The underground tunnel foundation pit bottom press bottom plate structure is characterized in that the integral connecting plate (10) is connected with the support pile (1) through an anchor pipe bolt (9).
4. The underground tunnel foundation pit bottom press floor structure according to claim 3, characterized in that the cross section of the integral connecting plate (10) is arc-shaped, the central angle is 45-60 degrees, and holes for the grouting anchor pipe (6) and the rear anchor bar (11) to penetrate are arranged on the integral connecting plate (10).
5. The bottom pressing bottom plate structure of the subway tunnel foundation pit according to claim 1, characterized in that the top die position control connecting plate (18) is vertically connected to the top die position control connecting plate (18), and the bottom of the top die position control connecting plate (18) is vertically connected to the bottom pressing bottom plate top die (20).
6. The bottom pressing bottom plate structure of the subway tunnel foundation pit is characterized in that the top die position control bolt is formed by rolling a screw rod and is in threaded connection with the top die position control connecting plate.
7. The floor pressing structure of the subway tunnel foundation pit bottom according to claim 2, characterized in that the prefabricated pressing floor (5) is provided with connecting steps (7) all around, a joint tenon (24) and a joint mortise (25) are arranged on the lower step of the prefabricated pressing floor (5), a prefabricated slab connecting rib (22) is arranged on the upper step of the prefabricated pressing floor (5), and an inter-slab reinforcing rib (26) connected with the bottom plate longitudinal rib (14) or the bottom plate stirrup (15) is arranged on the lower step connected with the cast-in-situ pressing floor (3).
8. The foundation pit bottom pressing plate structure of the subway tunnel foundation pit as claimed in claim 7, wherein the cross sections of the joint connecting tenon (24) and the joint mortise (25) are isosceles trapezoids, and the joint connecting tenon (24) and the joint mortise (25) are respectively arranged on two mutually parallel surfaces of the prefabricated pressing plate (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021452512.9U CN212896381U (en) | 2020-07-21 | 2020-07-21 | Subway tunnel foundation pit bottom pressing bottom plate structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021452512.9U CN212896381U (en) | 2020-07-21 | 2020-07-21 | Subway tunnel foundation pit bottom pressing bottom plate structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212896381U true CN212896381U (en) | 2021-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021452512.9U Active CN212896381U (en) | 2020-07-21 | 2020-07-21 | Subway tunnel foundation pit bottom pressing bottom plate structure |
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| CN (1) | CN212896381U (en) |
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2020
- 2020-07-21 CN CN202021452512.9U patent/CN212896381U/en active Active
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