CN212405174U - Supporting structure and building of soft rock foundation pit at lower part of upper soil layer - Google Patents

Supporting structure and building of soft rock foundation pit at lower part of upper soil layer Download PDF

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Publication number
CN212405174U
CN212405174U CN202021449957.1U CN202021449957U CN212405174U CN 212405174 U CN212405174 U CN 212405174U CN 202021449957 U CN202021449957 U CN 202021449957U CN 212405174 U CN212405174 U CN 212405174U
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fender
building
fender pile
soft rock
soil
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CN202021449957.1U
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曹平
刘春宇
刘洋
李果
张骐
唐凯
李冀伟
何伟
曾理彬
卢致强
钟扬
刘建伟
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Chengdu architectural design and Research Institute Co.,Ltd.
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Chengdu Architectural Design & Research Institute
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Abstract

The utility model belongs to the technical field of urban rail transit civil engineering, concretely relates to supporting construction, building of soft rock foundation ditch of upper portion soil layer lower part. The technical scheme is as follows: the utility model provides a supporting construction of soft rock foundation ditch of upper portion soil layer lower part, includes the fender pile, and the upper segment of fender pile is located the soil horizon, and the hypomere of fender pile stretches into the stratum, and the diameter of the upper segment of fender pile is greater than the diameter of the hypomere of fender pile. A building of a soft rock foundation pit on the lower part of an upper soil layer comprises a supporting structure and a plurality of layers of building main bodies. The utility model provides a practice thrift economy and can improve the super dark underground structure, the building of the soft rock of upper portion soil layer lower part of efficiency of construction.

Description

Supporting structure and building of soft rock foundation pit at lower part of upper soil layer
Technical Field
The utility model belongs to the technical field of urban rail transit civil engineering, concretely relates to supporting construction, building of soft rock foundation ditch of upper portion soil layer lower part.
Background
Subway stations generally adopt an open-cut and direct-construction method. Because open cut is buried shallowly, the wholeness of the structure, the self-waterproofing of the structure and the waterproofing effect of the additional waterproof layer can be ensured, and the construction is convenient, the construction cost is low, the construction period is easy to control, the requirement on the geological condition is not high, and the open cut direct construction method is preferentially adopted for construction under the ground condition. The supporting method is commonly used in open cut and sequential construction, in which an inner support or an anchor cable is added to the bored pile.
Due to the encryption of subway wire nets, the increase of transfer stations and the like, ultra-deep foundation pits with depths exceeding 25m appear in foundation pits of subway stations. In particular, in regions such as Chengdu, a plurality of ultra-deep foundation pits penetrate through an upper soil layer or a sandy gravel stratum, and the larger depth is in the range of a soft rock stratum. The soft rock stratum has better stability, and no over-sized fender post is needed. The supporting structure of the conventional design is continued to use the supporting form and the size parameter of a pure soil layer or a sandy gravel layer, so that waste is caused to a certain extent. And moreover, the fender piles with larger sizes are adopted in the upper soil layer and the lower soft rock layer, so that the construction efficiency is lower.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide an ultra-deep foundation pit supporting structure, building of the soft rock of upper portion soil layer lower part that practice thrift economy and can improve the efficiency of construction.
The utility model discloses the technical scheme who adopts does:
the utility model provides a supporting construction of soft rock foundation ditch of upper portion soil layer lower part, includes the fender pile, and the upper segment of fender pile is located the soil horizon, and the hypomere of fender pile stretches into the stratum, and the diameter of the upper segment of fender pile is greater than the diameter of the hypomere of fender pile, is provided with the arrangement of reinforcement in the fender pile. The diameter of the upper section of the fender pile is larger than that of the lower section of the fender pile, so that under the condition of meeting the requirements on strength and the like, the diameter of the fender pile extending into a rock stratum section is reduced, the using amount of reinforced concrete can be reduced, and the economy is saved. And because the diameter of the lower section of the fender post is reduced, the time for manufacturing the reinforcement cage is shortened, and the efficiency of pouring concrete is improved.
As the utility model discloses an optimal scheme, the hypomere of fender pile is connected with a plurality of anchor ropes, is connected with the support steel between the upper segment of the fender pile of both sides, is favorable to shallow pipeline and peripheral building protection. The lower part of the fender pile is supported by the anchor cable, so that the excavation efficiency of the foundation pit can be improved, and the underground structure is favorable for resisting floating. The utility model discloses an upper segment and hypomere of fender post adopt different support forms, can be under the circumstances of guaranteeing the support effect, efficiency when further improving economic nature and foundation ditch excavation.
As the utility model discloses a preferred scheme, the hypomere of fender pile and fender pile aligns in the soil facing side in the upper segment of fender pile, and the back of the body soil side of fender pile's hypomere forms fertile groove, and the anchor rope is connected in the fertile groove of the back of the body soil side of fender pile hypomere. Because the side wall is vertically arranged, a fertilizer groove with a certain width is reserved between the side wall and the lower section of the fender post. And the fertilizer groove between the side wall and the fender post can be used as an anchor cable fertilizer groove, so that the condition that the anchor cable fertilizer groove occupies space independently is avoided.
As the preferred scheme of the utility model, the top of fender pile is provided with the hat roof beam.
A building of a soft rock foundation pit at the lower part of an upper soil layer comprises fender posts at two sides, wherein the upper sections of the fender posts are positioned in the soil layer, the lower sections of the fender posts extend into a rock stratum, the diameter of the upper sections of the fender posts is larger than that of the lower sections of the fender posts, and reinforcing bars are arranged in the fender posts; a plurality of layers of building main bodies are arranged between the fender piles at two sides. The diameter of the upper section of the fender pile is larger than that of the lower section of the fender pile, so that under the condition of meeting the requirements on strength and the like, the diameter of the fender pile extending into a rock stratum section is reduced, the using amount of reinforced concrete can be reduced, and the economy is saved. And because the diameter of the lower section of the fender post is reduced, the time for manufacturing the reinforcement cage is shortened, and the efficiency of pouring concrete is improved.
As the utility model discloses an optimal scheme, the building subject includes side wall and floor, and the floor of bottommost protrudes the side wall setting. The upper segment of fender pile aligns at the soil facing side with the hypomere of fender pile, forms fertile groove between the soil-backed side of the hypomere of fender pile and the building subject, builds the piece in the fertile inslot. Therefore, the building blocks in the fertilizer groove can press the convex parts of the bottommost floor, and the anti-floating of the building main body is facilitated.
As the preferred scheme of the utility model, the top of fender pile is provided with the hat roof beam, is provided with the capping beam that the material is little expansion concrete between the top floor of hat roof beam and building subject. Therefore, the capping beam can also play a role in resisting floating of the building body.
The utility model has the advantages that:
1. the utility model discloses a diameter of fender pile's upper segment is greater than the diameter of fender pile's hypomere, then under the condition that satisfies requirements such as intensity, stretches into the diameter in rock layer section through reducing fender pile, and economy is practiced thrift to reducible reinforced concrete's quantity. And because the diameter of the lower section of the fender post is reduced, the time for manufacturing the reinforcement cage is shortened, and the efficiency of pouring concrete is improved.
2. Because the side wall is vertically arranged, a certain gap is reserved between the side wall and the lower section of the fender post. And the space between the side wall and the fender post can be used as an anchor cable fertilizer groove, so that the condition that the anchor cable fertilizer groove occupies space independently is avoided.
3. The upper section of the fender pile is supported by support steel, and the rigidity of the support steel is higher than that of the anchor cable, so that the fender pile is beneficial to protecting surrounding buildings. The lower part of the fender pile is supported by the anchor cable, so that the excavation efficiency of the foundation pit can be improved, and the underground structure is favorable for resisting floating. The utility model discloses an upper segment and hypomere of fender post adopt different support forms, can be under the circumstances of guaranteeing the support effect, efficiency when improving economic nature and foundation ditch excavation.
4. The bottom plate of building main body is chosen outward, and during the use of underground station, through and the fertile groove between filling fender post and the building main body of mould building, form the building block, then the bottom plate of building main body is pushed down by the building block of fertile inslot, avoids building main body come-up. And the crown beam and the capping beam can press the building main body from the upper part of the building main body, so that the anti-floating capacity of the building main body is further improved.
Drawings
Fig. 1 is a schematic structural view of the supporting structure of the present invention;
FIG. 2 is a schematic structural view of the building of the present invention;
fig. 3 is a schematic structural view of a fender post.
In the figure, 1-fender post; 2-reinforcing bars; 3, anchor cable; 4-support steel; 5-a crown beam; 6-building main body; 7-capping the beam; 8-building blocks; 9-anti-floating beam; 51-a retaining wall; 61-side walls; 62-floor.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
Example 1:
as shown in fig. 1, the supporting structure of the soft rock foundation pit on the lower portion of the upper soil layer comprises a fender pile 1, wherein the upper section of the fender pile 1 is located in the soil layer, the lower section of the fender pile 1 extends into the rock layer, the diameter of the upper section of the fender pile 1 is larger than that of the lower section of the fender pile 1, a reinforcement bar 2 is arranged in the fender pile 1, and a crown beam 5 is arranged at the top of the fender pile 1. The utility model discloses a diameter of fender pile 1's upper segment is greater than the diameter of fender pile 1's hypomere, then under the condition that satisfies requirements such as intensity, through reducing the diameter that fender pile 1 stretches into the rock stratum section, the economy is practiced thrift to reducible reinforced concrete's quantity. And, because the diameter of the lower section of the fender post 1 is reduced, the time for manufacturing the steel reinforcement cage is shortened, and the efficiency of pouring concrete is improved.
The lower section of the fender pile 1 is connected with a plurality of anchor cables 3, and supporting steel 4 is connected between the upper sections of the fender piles 1 on the two sides. The upper section of the fender pile 1 is supported by support steel 4, and the rigidity of the support steel 4 is larger than that of the anchor cable 3, so that the protection of surrounding buildings is facilitated. The lower part of the fender pile 1 is supported by the anchor cable 3, so that the excavation efficiency of a foundation pit can be improved, and the underground structure is favorable for resisting floating. The utility model discloses an upper segment and hypomere of fender pile 1 adopt different support forms, can be under the circumstances of guaranteeing the support effect, efficiency when further improving economic nature and foundation ditch excavation.
The upper section of the fender pile 1 is aligned with the lower section of the fender pile 1 on the soil-facing side, the soil-back side of the lower section of the fender pile 1 forms a fertilizer groove, and the anchor cable 3 is connected in the fertilizer groove on the soil-back side of the lower section of the fender pile 1. Because the side wall 61 is vertically arranged, a certain gap is left between the side wall 61 and the lower section of the fender post 1. And the gap between the side wall 61 and the fender pile 1 can be used as a fertilizer groove of the anchor cable 3, so that the condition that the fertilizer groove of the anchor cable 3 occupies space independently is avoided.
As shown in fig. 3, the reinforcing bars 2 in the fender pile 1 are provided with longitudinal main bars, spiral stirrups and stiffening bars. The reinforcing bars 2 are uniformly distributed in the fender post 1. The fertilizer groove of the anchor cable 3 is arranged on the soil-back side of the lower section of the fender pile 1, and the other end of the anchor cable 3 obliquely extends to the soil-facing side of the lower section of the fender pile 1 and is fixed.
Example 2:
as shown in fig. 2, the building of the soft rock foundation pit at the lower part of the upper soil layer comprises fender posts 1 at two sides, wherein the upper sections of the fender posts 1 are positioned in the soil layer, the lower sections of the fender posts 1 extend into the rock layer, the diameter of the upper sections of the fender posts 1 is larger than that of the lower sections of the fender posts 1, and reinforcing bars 2 are arranged in the fender posts 1; a plurality of layers of building main bodies 6 are arranged between the fender piles 1 at two sides.
The diameter of the upper section of the fender post 1 of the embodiment is larger than that of the lower section of the fender post 1, so that under the condition of meeting the requirements on strength and the like, the diameter of the fender post 1 extending into a rock stratum section is reduced, the using amount of reinforced concrete can be reduced, and the economy is saved. And, because the diameter of the lower section of the fender post 1 is reduced, the time for manufacturing the steel reinforcement cage is shortened, and the efficiency of pouring concrete is improved.
In the process of excavating the foundation pit, the upper section of the fender post 1 is supported by the support steel 4, and the rigidity of the support steel 4 is higher than that of the anchor cable 3, so that the protection of surrounding buildings is facilitated. When the building main body 6 is laid, the supporting steel 4 is gradually removed, and the safety of the whole construction process is ensured. The lower part of the fender pile 1 is supported by the anchor cable 3, so that the excavation efficiency of a foundation pit can be improved, and the underground structure is favorable for resisting floating.
The upper section of the fender pile 1 is aligned with the lower section of the fender pile 1 on the soil-facing side, and the anchor cable 3 is connected to the soil-back side of the lower section of the fender pile 1. Because the side wall 61 is vertically arranged, a certain gap is left between the side wall 61 and the lower section of the fender post 1. And the gap between the side wall 61 and the fender pile 1 can be used as a fertilizer groove of the anchor cable 3, so that the condition that the fertilizer groove of the anchor cable 3 occupies space independently is avoided. And after the anchor cable 3 is installed in the gap between the side wall 61 and the lower section of the fender post 1, filling the gap with concrete.
The building main body 6 comprises side walls 61 and floor slabs 62, and the floor slab 62 at the bottommost layer is arranged to protrude out of the side walls 61. The upper segment of fender pile 1 aligns at the soil facing side with the hypomere of fender pile 1, forms fertile groove between the soil backing side of the hypomere of fender pile 1 and building subject 6, builds building block 8 in the fertile groove. Therefore, the building blocks 8 in the fertilizer groove can press the convex parts of the bottommost floor slab 62, and the building main body 6 is favorably prevented from floating. The top of the fender pile 1 is provided with a crown beam 5, and a capping beam 7 made of micro-expansive concrete is arranged between the crown beam 5 and a top floor 62 of the building main body 6. Thus, the cap 7 and the crown 5 also serve the purpose of anti-floating of the building body 6. Still be provided with anti floating beam 9 between the upper segment of building block 8 and fender pile 1, further improve the anti effect of floating of building subject 6 and fender pile 1.
As shown in fig. 3, the reinforcing bars 2 in the fender pile 1 are provided with longitudinal main bars, spiral stirrups and stiffening bars. The reinforcing bars 2 are uniformly distributed in the fender post 1. The fertilizer groove of the anchor cable 3 is arranged on the soil-back side of the lower section of the fender pile 1, and the other end of the anchor cable 3 obliquely extends to the soil-facing side of the lower section of the fender pile 1 and is fixed.
The implementation process of the ultra-deep foundation pit building comprises the following steps:
s1: and drilling by adopting drill bits with different pore-forming diameters, wherein the pore diameter in the rock stratum is smaller than that in the soil stratum.
S2: putting a reinforcement cage in the drilled hole, and performing underwater concrete pouring to form a fender post 1; the crown beam 5 and the retaining wall 51 are constructed.
S3: excavating a foundation pit; and in the process of excavating the foundation pit, a plurality of supporting steels 4 are erected between the upper sections of the fender piles 1 on the two sides, and a plurality of anchor cables 3 are arranged on the lower sections of the fender piles 1.
When the foundation pit is excavated to be 0.5m below the central line of the support steel 4 to be erected, stopping excavation and erecting the support steel 4 in time; and (5) excavating the foundation pit until the position of the anchor cable 3 to be arranged is 0.5m below, stopping excavating and arranging the anchor cable 3 in time.
S4: a plurality of layers of building main bodies 6 are constructed in the foundation pit, and the supporting steel 4 is dismantled in the process. The method specifically comprises the following steps: excavating the foundation pit to a designed elevation, and constructing a bottom floor 62 and a part of the side wall 61; after the concrete of the bottom floor 62 reaches the design strength, constructing a negative three-layer side wall 61, a negative two-layer floor 62, a middle longitudinal beam and a middle column; after the concrete of the negative second floor 62 reaches the design strength, constructing a negative second side wall 61, a negative first floor 62, a middle longitudinal beam and a middle column; and after the concrete of the first floor 62 reaches the designed strength, removing the second supporting steel 4, and constructing the first side wall 61, the top floor 62, the top longitudinal beam and the middle column.
In the process of constructing the building main body 6, concrete is poured into the fertilizer tank to form a building block (8), and a floating-resisting beam 9 is constructed between the building block and the upper section of the fender pile 1. The capping beams 7 are applied between the top floor 62 of the building body 6 and the crown beams 5.
S5: and (3) after the top floor slab 62 and the side wall 61 reach the design strength, removing the first supporting steel 4, removing the retaining wall 51, backfilling the foundation pit and recovering the pavement.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.

Claims (7)

1. The utility model provides a supporting construction of soft rock foundation ditch of upper portion soil layer lower part, its characterized in that includes fender pile (1), and the upper segment of fender pile (1) is located the soil horizon, and the hypomere of fender pile (1) stretches into the stratum, and the diameter of the upper segment of fender pile (1) is greater than the diameter of the hypomere of fender pile (1).
2. The supporting structure of the soft rock foundation pit on the upper soil layer and the lower soft rock foundation pit is characterized in that a plurality of anchor cables (3) are connected to the lower sections of the fender piles (1), and supporting steel (4) are connected between the upper sections of the fender piles (1) on the two sides.
3. The supporting structure of the soft rock foundation pit under the upper soil layer is characterized in that the upper section of the fender pile (1) is aligned with the lower section of the fender pile (1) on the soil facing side, the soil backing side of the lower section of the fender pile (1) forms a fertilizer groove, and the anchor cable (3) is connected into the fertilizer groove on the soil backing side of the lower section of the fender pile (1).
4. The supporting structure of the soft rock foundation pit on the upper soil layer and the lower soft rock foundation pit according to any one of claims 1-3, characterized in that the top of the fender post (1) is provided with a crown beam (5).
5. The building of the soft rock foundation pit at the lower part of the upper soil layer is characterized by comprising fender posts (1) at two sides, wherein the upper sections of the fender posts (1) are positioned in the soil layer, the lower sections of the fender posts (1) extend into a rock stratum, and the diameter of the upper sections of the fender posts (1) is larger than that of the lower sections of the fender posts (1); a plurality of layers of building main bodies (6) are arranged between the fender piles (1) at the two sides.
6. The building of the soft rock foundation pit on the lower part of the upper soil layer is characterized in that the building main body (6) comprises a side wall (61) and a floor slab (62), the floor slab (62) on the bottommost layer is arranged to protrude out of the side wall (61), the upper section of the fender post (1) is aligned with the lower section of the fender post (1) on the soil facing side, a fertilizer groove is formed between the soil backing side of the lower section of the fender post (1) and the building main body (6), and a building block (8) is built in the fertilizer groove.
7. The building of the soft rock foundation pit on the upper soil layer and the lower soft rock foundation pit is characterized in that the top of the fender pile (1) is provided with a crown beam (5), and a capping beam (7) made of micro-expansion concrete is arranged between the crown beam and a top floor (62) of the building body (6).
CN202021449957.1U 2020-07-21 2020-07-21 Supporting structure and building of soft rock foundation pit at lower part of upper soil layer Active CN212405174U (en)

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Application Number Priority Date Filing Date Title
CN202021449957.1U CN212405174U (en) 2020-07-21 2020-07-21 Supporting structure and building of soft rock foundation pit at lower part of upper soil layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021449957.1U CN212405174U (en) 2020-07-21 2020-07-21 Supporting structure and building of soft rock foundation pit at lower part of upper soil layer

Publications (1)

Publication Number Publication Date
CN212405174U true CN212405174U (en) 2021-01-26

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Address after: 610017 No. 4, floor 1, building 1, No. 28, dongchenggenxia street, Qingyang District, Chengdu, Sichuan

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