CN212452653U - Supporting structure for constructing foundation pit above existing facility - Google Patents
Supporting structure for constructing foundation pit above existing facility Download PDFInfo
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- CN212452653U CN212452653U CN202021110183.XU CN202021110183U CN212452653U CN 212452653 U CN212452653 U CN 212452653U CN 202021110183 U CN202021110183 U CN 202021110183U CN 212452653 U CN212452653 U CN 212452653U
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Abstract
The utility model relates to a supporting construction of foundation ditch is under construction in existing facility top, include: the door type reinforcing body encloses the existing facilities; a pipe curtain formed in a top beam of the door-type reinforcement body. The utility model has the advantages that the reinforcement body is arranged around the existing facility, the pipe curtain is arranged in the top beam of the reinforcement body, the pipe curtain and the reinforcement body integrally resist the water pressure around the existing facility and restrict the deformation of the existing facility, so that the better protection effect and the water blocking effect can be obtained, and the safety of foundation pit excavation and the structural safety of the existing facility can be fully ensured; the supporting structure can be well applied to engineering construction under the conditions of a water-containing sand layer and the like, and particularly, the construction safety performance of engineering such as excavation of a foundation pit above an underground tunnel and the like is well guaranteed.
Description
Technical Field
The utility model belongs to the technical field of civil engineering, concretely relates to supporting construction in existing facility top construction foundation ditch.
Background
The shield tunnel is the structure form that urban rail transit is used always, along with rail transit's vigorous development, inevitably can be under the shield tunnel construction foundation ditch engineering, this can cause very big influence to the safety in tunnel, especially excavate the foundation ditch in rich water sand bed, confined water aquifer and still can often meet the not enough condition of confined water stability. Under the common condition, when the stability of confined water is insufficient, confined water can be reduced or confined water can be separated by adopting an enclosure structure to meet the requirement of confined water inrush stability in foundation pit engineering, but the tunnel generates larger deformation to influence the safety of the tunnel aiming at the precipitation of the foundation pit engineering above the tunnel, and the enclosure structure cannot be lengthened to separate the confined water due to the existence of the tunnel below the foundation pit.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a supporting construction of foundation ditch is under construction in existing facility top can solve prior art's partial defect at least.
The utility model relates to a supporting construction of foundation ditch is under construction in existing facility top, include:
the door type reinforcing body encloses the existing facilities;
a pipe curtain formed in a top beam of the door-type reinforcement body.
As one embodiment, the supporting structure for constructing a foundation pit above an existing facility further includes two sets of well body enclosures formed on two sides of the portal-type reinforcing body, and two ends of the pipe curtain respectively extend out of the portal-type reinforcing body and are connected with the well body enclosures on the corresponding side to form an anti-floating structure.
As one embodiment, the anti-floating structure comprises a pipe curtain, a well body enclosure structure adjacent to the pipe curtain and anchor bars, wherein the anchor bars are partially positioned in the pipe curtain steel pipe, partially extend out of the pipe curtain steel pipe and are lapped with the enclosure steel bars of the well body enclosure structure, and the pipe curtain and the well body enclosure structure are integrated through cast-in-place concrete.
As one of the implementation modes, the anchor bar comprises an upper bar section and a lower bar section, the upper bar section is contained in the pipe curtain steel pipe, the lower bar section is arranged on the pipe curtain steel pipe in a penetrating manner, the top of the lower bar section is connected with the upper bar section through a bar connector, and the bottom of the lower bar section is in lap joint with the enclosure bar.
As an embodiment, the anchoring end of the anchor bar is located in the tube curtain steel tube.
In one embodiment, the anchor bars are distributed to form a plurality of bar rows, each bar row is sequentially arranged along the width direction of the pipe curtain, and each bar row comprises a plurality of anchor bars sequentially arranged along the axial direction of the pipe curtain steel pipe.
In one embodiment, the well body enclosure structure comprises a waterproof curtain and cast-in-situ bored piles located on the periphery of the waterproof curtain, and the pipe curtain is connected with the cast-in-situ bored piles.
As one embodiment, the existing facility is an underground tunnel, and the door-type reinforcing body is correspondingly formed with two door openings.
The utility model discloses following beneficial effect has at least:
the utility model has the advantages that the reinforcement body is arranged around the existing facility, the pipe curtain is arranged in the top beam of the reinforcement body, the pipe curtain and the reinforcement body integrally resist the water pressure (such as the pressure of the pressure-bearing water) around the existing facility and restrict the deformation of the existing facility, so that the better protection effect and the water blocking effect can be obtained, and the safety of the excavation of the foundation pit and the structural safety of the existing facility can be fully ensured; the supporting structure can be well applied to engineering construction under the conditions of a water-containing sand layer and the like, and particularly, the construction safety performance of engineering such as excavation of a foundation pit above an underground tunnel and the like is well guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic plan view of a supporting structure provided in an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
fig. 4 is a schematic view of an anti-floating structure provided in an embodiment of the present invention;
fig. 5 is a schematic view of the distribution of anchor bars in the anti-floating structure provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, 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 without creative efforts belong to the protection scope of the present invention.
Example one
As shown in fig. 1-3, an embodiment of the present invention provides a method for constructing a foundation pit above an existing facility, including:
s1, constructing a door type reinforcing body 3, wherein the door type reinforcing body 3 encloses the existing facility 1;
s2, constructing an initial well 51 and a receiving well 52;
s3, performing construction of a pipe screen 4 through the starting well 51 and the receiving well 52, wherein the pipe screen 4 is formed in the top beam 31 of the door-type reinforcement 3;
and S4, backfilling the initial well 51 and the receiving well 52, and constructing the foundation pit 2.
The door type reinforcing bodies 3 are of a door type structure, namely reinforcing and enclosing are carried out on the left side and the right side of the existing facility 1 and above the existing facility 1; the existing engineering reinforcement 3 is suitable for this embodiment, and preferably a cement-based reinforcement is used, such as a mixing pile reinforcement, a grouting reinforcement, or a reinforcement made by MJS method, and the detailed structure thereof is not described herein. In one embodiment, the existing facility 1 is an underground tunnel 1, especially a shield tunnel 1, and the portal reinforcement body 3 may be correspondingly provided with two door openings for respectively enclosing the two tunnels, so that the reinforcement structure is more stable and can better support an upper engineering structure. The door-type reinforcing body 3 is preferably constructed by using an MJS construction method, which is a conventional construction method and will not be described in detail herein, and the disturbance to the soil body is small.
The construction of the starting well 51 and the receiving well 52 and the construction of the pipe screen 4 through the starting well 51 and the receiving well 52 are prior art, and are easy to operate by those skilled in the art, and will not be described herein. Wherein, the construction of the pipe curtain 4 is preferably the construction by adopting a pipe jacking method; the diameter of the pipe curtain steel pipes 41 and the distance between adjacent pipe curtain steel pipes 41 can be determined according to actual engineering, and water stop steel plates can be arranged between the pipe curtain steel pipes 41 according to actual engineering requirements or freezing pipes are embedded in the pipe curtain steel pipes 41 to freeze and reinforce soil bodies between the pipe curtains so as to meet water stop requirements.
In the above S4, after the originating well 51 and the receiving well 52 are backfilled, the foundation pit 2 is excavated by dividing the pit according to the normal procedure and the corresponding structural section is constructed at the position of the foundation pit 2, and the number of divided pits of the foundation pit 2 and the construction procedure can be determined according to the actual engineering situation.
In the method for constructing the foundation pit above the existing facility, provided by the embodiment, the reinforcement 3 is applied around the existing facility 1 for reinforcement, the pipe curtain 4 is applied in the top beam 31 of the reinforcement 3, and the pipe curtain 4 and the reinforcement 3 integrally resist the water pressure (such as the pressure of the pressure-bearing water) around the existing facility 1 and restrain the deformation of the existing facility 1, so that a better protection effect and a water blocking effect can be obtained, and the excavation safety of the foundation pit 2 and the structural safety of the existing facility 1 can be fully ensured; the method can be well applied to engineering construction under the conditions of a water-containing sand layer and the like, and particularly, the construction safety performance of engineering such as excavation of a foundation pit 2 above an underground tunnel 1 and the like is well guaranteed.
Further optimizing the method, in S2, the originating well 51 and the receiving well 52 are each implemented with well enclosures 6. Conventional well enclosures 6 are suitable for use in this embodiment, and in one embodiment the well enclosure 6 includes a waterproof curtain 62 and bored piles 61 positioned around the waterproof curtain 62. As shown in fig. 3, optionally the enclosure of the well enclosure 6 near the existing installation 1 side is attached to the portal reinforcement 3.
The well body enclosure structure 6 not only ensures the construction safety of the initial well 51 and the receiving well 52, but also can play a role of peripheral enclosure after the initial well 51 and the receiving well 52 are backfilled, and can further ensure the excavation safety of the foundation pit 2 and the structural safety of the existing facility 1. Further preferably, in S3, after the pipe curtain 4 is constructed in place, the pipe curtain 4 is connected with the well enclosure 6 to form an anti-floating structure, and based on the structure, the reinforcement 3, the pipe curtain 4 and the well enclosure 6 can be combined into an integrated structure, so that the overall stress performance of the structure is remarkably improved, the requirements on confined water inrush stability and the like are met, the anti-floating performance of the pipe curtain 4 and the reinforcement 3 can be remarkably improved, and the excavation safety of the foundation pit 2 and the structural safety of the existing facility 1 are further improved. In the above-mentioned structure in which the well enclosure 6 includes the waterproof curtain 62 and the bored pile 61, it is preferable that the pipe curtain 4 is connected to the bored pile 61.
Further preferably, as shown in fig. 4 and 5, the construction method of the anti-floating structure includes:
chiseling off the concrete of the well body enclosure structure 6 at the corresponding position and exposing the enclosure reinforcing steel bar 611, and completing the construction of the anchor bar 7 through a bar penetrating hole reserved on the pipe curtain steel pipe 41, wherein the anchor bar 7 is partially positioned in the pipe curtain steel pipe 41 and partially extends to be lapped with the enclosure reinforcing steel bar 611;
the cast-in-place concrete enables the pipe curtain 4 and the adjacent well body enclosure structure 6 to be solidified into a whole.
The well body enclosure 6 at the corresponding position obviously corresponds to the construction position of the pipe curtain steel pipe 41, and preferably, because the pipe curtain 4 has a certain width, the enclosure bodies close to the reinforcing bodies 3 within the width range of the pipe curtain 4 are preferably chiseled off from top to bottom in sequence, so that the top of the part of the enclosure bodies is positioned below the pipe curtain 4. Obviously, the chiseled portion is a reinforced concrete structure, which satisfies the above-mentioned purpose of exposing the enclosure reinforcement 611; for example, in the above-described structure in which the well enclosure 6 includes the waterproof curtain 62 and the cast-in-situ bored pile 61, the cast-in-situ bored pile 61 is constructed of a reinforced concrete pile.
Preferably, the anchoring end of the anchor bar 7 is positioned in the tube curtain steel tube 41; for convenience of construction, the anchor bars 7 can be segmented, the upper bar segments 71 are directly sent into the pipe curtain steel pipes 41, the lower bar segments 72 penetrate into the pipe curtain steel pipes 41 from the bar penetrating holes reserved on the pipe curtain steel pipes 41 from bottom to top, and the upper bar segments 71 are connected with the lower bar segments 72 through bar connectors and the like. That is, the rib penetrating hole is formed at the bottom of the tube curtain steel tube 41, or when the tube curtain 4 is constructed, the rib penetrating hole of the tube curtain steel tube 41 is formed at the bottom thereof. Furthermore, in order to facilitate the construction of the cast-in-place concrete, cast-in-place holes are formed in the top of the pipe curtain steel pipe 41, and the cast-in-place concrete can enter the pipe curtain steel pipe 41 through each cast-in-place hole; meanwhile, cast-in-place concrete obviously fills a chiseling space between the pipe curtain 4 and the enclosure below, and the pipe curtain 4 and the well enclosure structure 6 can be connected into a whole due to the fact that the anchor bars 7 are in lap joint with the enclosure reinforcing bars 611.
The construction method of the anti-floating structure is simple to operate and convenient to construct, and can better ensure the connection reliability between the pipe curtain 4 and the well body enclosure structure 6.
Example two
As shown in fig. 1-3, the embodiment of the utility model provides a supporting construction of construction foundation ditch above existing facility includes:
the door type reinforcing body 3 encloses the existing facility 1;
a pipe screen 4, the pipe screen 4 being formed in the top beam 31 of the door-type reinforcement body 3.
The door type reinforcing bodies 3 are of a door type structure, namely reinforcing and enclosing are carried out on the left side and the right side of the existing facility 1 and above the existing facility 1; the existing engineering reinforcement 3 is suitable for this embodiment, and preferably a cement-based reinforcement is used, such as a mixing pile reinforcement, a grouting reinforcement, or a reinforcement made by MJS method, and the detailed structure thereof is not described herein. In one embodiment, the existing facility 1 is an underground tunnel 1, and the door-type reinforcing body 3 may be correspondingly provided with two door openings for respectively enclosing the two tunnels, so that the reinforcing structure is more stable and can better support an upper engineering structure. The tube sheet 4 is a conventional engineering structure, and generally includes a tube row composed of a plurality of tube sheet steel tubes 41, and the diameter of the tube sheet steel tubes 41 and the distance between adjacent tube sheet steel tubes 41 can be determined according to the actual engineering.
According to the supporting structure provided by the embodiment, the reinforcement body 3 is arranged around the existing facility 1 for reinforcement, the pipe curtain 4 is arranged in the top beam 31 of the reinforcement body 3, and the pipe curtain 4 and the reinforcement body 3 integrally resist the water pressure (such as pressure-bearing water pressure) around the existing facility 1 and restrain the deformation of the existing facility 1, so that a better protection effect and a water blocking effect can be obtained, and the excavation safety of the foundation pit 2 and the structural safety of the existing facility 1 are fully ensured; the supporting structure can be well applied to engineering construction under the conditions of a water-containing sand layer and the like, and particularly, the construction safety performance of engineering such as excavation of a foundation pit 2 above an underground tunnel 1 and the like is well guaranteed.
In a preferred scheme, as shown in fig. 1 and 3, the supporting structure further comprises two groups of well body enclosures 6 formed on two sides of the portal-type reinforcing body 3, and two ends of the pipe curtain 4 respectively extend out of the portal-type reinforcing body 3 and are connected with the well body enclosures 6 on the corresponding sides to form an anti-floating structure. The two groups of well body enclosing structures 6 are used for enclosing the starting well 51 and the receiving well 52 during construction of the pipe curtain 4, and also have peripheral enclosing effects on the existing facility 1 and the foundation pit 2, so that the excavation safety of the foundation pit 2 and the structural safety of the existing facility 1 can be further ensured. Based on the anti-floating structure, the reinforcing body 3, the pipe curtain 4 and the well body enclosure structure 6 can be combined into an integrated structure, the overall stress performance of the structure is obviously improved, the requirements of confined water inrush stability and the like are met, meanwhile, the anti-floating performance of the pipe curtain 4 and the reinforcing body 3 can be obviously improved, and the excavation safety of the foundation pit 2 and the structural safety of the existing facility 1 are further improved.
As shown in fig. 3, optionally, the enclosure body of the well enclosure structure 6 close to one side of the existing facility 1 is attached to the door-type reinforcing body 3, so that the water-stopping effect is better. Conventional well enclosures 6 are suitable for use in this embodiment, and in one embodiment the well enclosure 6 includes a waterproof curtain 62 and bored piles 61 positioned around the waterproof curtain 62. In the above-mentioned structure in which the well enclosure 6 includes the waterproof curtain 62 and the bored pile 61, it is preferable that the pipe curtain 4 is connected to the bored pile 61.
Further preferably, as shown in fig. 4 and 5, the anti-floating structure comprises a pipe curtain 4, a well body enclosure 6 adjacent to the pipe curtain 4, and anchor bars 7, wherein the anchor bars 7 are partially located in the pipe curtain steel pipe 41, partially extend out of the pipe curtain steel pipe 41 and overlap with the enclosure reinforcing bars 611 of the well body enclosure 6, and the pipe curtain 4 and the well body enclosure 6 are integrated by cast-in-place concrete. Correspondingly, a rib penetrating hole is formed at the bottom of the pipe curtain steel pipe 41, and the anchor rib 7 penetrates through the rib penetrating hole; preferably, the anchoring end of the anchor bar 7 is positioned in the tube curtain steel tube 41; in one embodiment, for convenience of construction, the anchor bars 7 include an upper bar section 71 and a lower bar section 72, the upper bar section 71 is located in the tube curtain steel tube 41, the bottom of the lower bar section 72 overlaps the enclosure bar 611 and the top of the lower bar section extends into the tube curtain steel tube 41 to connect with the upper bar section 71, and the two can be connected by a bar connector or the like.
The well casing 6 adjacent to the pipe sheet 4, i.e. the enclosure of the well casing 6 near the reinforcement 3, is preferably chiseled from the top down in sequence within the width of the pipe sheet 4, so that the top of the part of the enclosure is located below the pipe sheet 4 to form the enclosure to be connected with the pipe sheet 4, as described in the above embodiment. Obviously, the enclosure body connected to the pipe curtain 4 is of a reinforced concrete structure, which satisfies the above-mentioned purpose of exposing the enclosure reinforcing bars 611; for example, in the above-described structure in which the well enclosure 6 includes the waterproof curtain 62 and the cast-in-situ bored pile 61, the cast-in-situ bored pile 61 is constructed of a reinforced concrete pile.
Furthermore, in order to facilitate the construction of the cast-in-place concrete, cast-in-place holes are formed in the top of the pipe curtain steel pipe 41, and the cast-in-place concrete can enter the pipe curtain steel pipe 41 through each cast-in-place hole; meanwhile, cast-in-place concrete obviously fills a chiseling space between the pipe curtain 4 and the enclosure below, and the pipe curtain 4 and the well enclosure structure 6 can be connected into a whole due to the fact that the anchor bars 7 are in lap joint with the enclosure reinforcing bars 611.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a supporting construction of construction foundation ditch above existing facility which characterized in that includes:
the door type reinforcing body encloses the existing facilities;
a pipe curtain formed in a top beam of the door-type reinforcement body.
2. A support structure for constructing a foundation pit over an existing facility as claimed in claim 1, wherein: the anti-floating type well body structure is characterized by further comprising two groups of well body enclosing structures formed on two sides of the door type reinforcing body, and two ends of the pipe curtain respectively extend out of the door type reinforcing body and are connected with the well body enclosing structures on the corresponding sides to form an anti-floating structure.
3. A support structure for constructing a foundation pit over an existing facility as claimed in claim 2, wherein: the anti-floating structure comprises a pipe curtain, a well body enclosure structure adjacent to the pipe curtain and anchor bars, wherein the anchor bars are partially positioned in the pipe curtain steel pipe, partially extend out of the pipe curtain steel pipe and are in lap joint with the enclosure steel bars of the well body enclosure structure, and the pipe curtain and the well body enclosure structure are integrated through cast-in-place concrete.
4. A support structure for constructing a foundation pit over an existing facility as claimed in claim 3, wherein: the anchor bar comprises an upper rib section and a lower rib section, the upper rib section is contained in the pipe curtain steel pipe, the lower rib section penetrates through the pipe curtain steel pipe, the top of the lower rib section is connected with the upper rib section through a steel bar connector, and the bottom of the lower rib section is in lap joint with the enclosure steel bars.
5. A support structure for constructing a foundation pit over an existing facility as claimed in claim 3, wherein: and the anchoring end of the anchor bar is positioned in the pipe curtain steel pipe.
6. A support structure for constructing a foundation pit over an existing facility as claimed in claim 3, wherein: the anchor bar has a plurality ofly and distributes and form a plurality of muscle row, and each muscle row is arranged along pipe curtain width direction in proper order, and every muscle row includes a plurality of anchor bars that arrange in proper order along pipe curtain steel pipe axial.
7. A support structure for constructing a foundation pit over an existing facility as claimed in claim 2, wherein: the well body enclosing structure comprises a waterproof curtain and cast-in-situ bored piles located on the periphery of the waterproof curtain, and the pipe curtain is connected with the cast-in-situ bored piles.
8. A support structure for constructing a foundation pit over an existing facility as claimed in claim 1, wherein: the existing facilities are underground tunnels, and the door type reinforcing bodies are correspondingly provided with two door openings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021110183.XU CN212452653U (en) | 2020-06-16 | 2020-06-16 | Supporting structure for constructing foundation pit above existing facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021110183.XU CN212452653U (en) | 2020-06-16 | 2020-06-16 | Supporting structure for constructing foundation pit above existing facility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212452653U true CN212452653U (en) | 2021-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021110183.XU Active CN212452653U (en) | 2020-06-16 | 2020-06-16 | Supporting structure for constructing foundation pit above existing facility |
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|---|---|
| CN (1) | CN212452653U (en) |
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2020
- 2020-06-16 CN CN202021110183.XU patent/CN212452653U/en active Active
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