CN217870505U - Excavation supporting construction of tunnel top foundation ditch excavation - Google Patents
Excavation supporting construction of tunnel top foundation ditch excavation Download PDFInfo
- Publication number
- CN217870505U CN217870505U CN202221179202.3U CN202221179202U CN217870505U CN 217870505 U CN217870505 U CN 217870505U CN 202221179202 U CN202221179202 U CN 202221179202U CN 217870505 U CN217870505 U CN 217870505U
- Authority
- CN
- China
- Prior art keywords
- steel
- excavation
- tunnel
- pile
- shotcrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Foundations (AREA)
Abstract
The utility model relates to a foundation ditch excavation enclosure technical field especially relates to an excavation supporting construction of tunnel top foundation ditch excavation. Including two-way tunnel, two-way tunnel both sides are provided with the bored concrete pile, be provided with the lattice column stake in the middle of the two-way tunnel, be provided with steel lattice column on the lattice column stake, steel lattice column roof portion is provided with even roof beam along two-way tunnel excavation direction and connects, is provided with the multilayer steel shotcrete along the excavation direction in the foundation ditch, the steel shotcrete sets up and all is connected with the bored concrete pile in the top and both ends of two-way tunnel excavation face. The multilayer steel shotcrete includes from last first steel shotcrete, second steel shotcrete and the third steel shotcrete extremely down, and every steel shotcrete all sets up in every layer excavation face top 0.5m department. The utility model discloses can reduce the disturbance of foundation ditch excavation to the tunnel, the cost is low, and construction cycle is short, and the construction degree of difficulty is low.
Description
Technical Field
The utility model relates to a excavation supporting technology field especially relates to an excavation supporting construction of tunnel top excavation.
Background
Along with the development of urban subway tunnels, the buildings built along the subway line are more and more, the excavation problem of the brought deep foundation pit is more and more complicated, under the ordinary condition, excavation of the foundation pit above the subway tunnel is bound to be accompanied by disturbance to the subway tunnel, and then the uplift deformation of the subway tunnel is caused, so that technical challenges and risks are brought to excavation construction of the foundation pit. The existing underground top foundation pit supporting structure has the problems of high construction cost, long construction period and the like.
In order to ensure the safe operation of the underground tunnel, the underground continuous wall is deepened and thickened in the engineering, but the cast-in-place structure has higher manufacturing cost and longer construction period, and particularly under the condition that the underground continuous wall of the underground tunnel is protected to be built, the thickness and the depth of the underground continuous wall are difficult to increase. Therefore, an excavation supporting structure specially aiming at the excavation foundation pit above the tunnel needs to be researched so as to reduce the disturbance of the excavation of the foundation pit to the tunnel. And (3) constructing foundation engineering above the subway tunnel by adopting a new supporting structure.
SUMMERY OF THE UTILITY MODEL
To the problem that exists, the utility model aims at providing an excavation supporting construction of tunnel top foundation ditch excavation for solve among the prior art tunnel top excavation foundation ditch and cause the disturbance to the tunnel easily, and the seepage flow of river influences the stability of foundation ditch, and then causes the technical problem that the tunnel uplift warp easily.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides an excavation supporting construction of tunnel top foundation ditch excavation, includes two-way tunnel, two-way tunnel both sides are provided with the bored concrete pile, be provided with lattice column pile in the middle of the two-way tunnel, be provided with steel lattice column on the lattice column pile, steel lattice column top is provided with even roof beam along two-way tunnel tunnelling direction and connects, is provided with the multilayer steel shotcrete along the excavation direction in the foundation ditch, the steel shotcrete sets up and all is connected with the bored concrete pile in the top and both ends of two-way tunnel excavation face.
Preferably, the cast-in-situ bored pile comprises a steel casing and a steel reinforcement cage, the steel casing is driven into the pile forming area and then drilled, the steel reinforcement cage is placed in the hole, stirrups are arranged on the outer ring of the steel reinforcement cage, a crown beam extends from the top of the steel reinforcement cage, and concrete is poured into the steel reinforcement cage to form the cast-in-situ bored pile.
Preferably, the steel lattice column is formed by welding four equilateral angle steels and batten plates.
Preferably, multilayer steel shotcrete includes from last first steel shotcrete, second steel shotcrete and the third steel shotcrete that sets up to interval in proper order down, and every way steel shotcrete all sets up in every layer excavation face top 0.5m department, the both ends of first steel shotcrete set up on the joint spare, the joint spare is fixed to be set up on the bored concrete pile, and the both ends of second steel shotcrete and third steel shotcrete all are provided with the steel and enclose the arris.
Preferably, the clamping piece is a clamping barrel transversely installed at the upper end of the cast-in-situ bored pile, an open slot is formed in the upper end of the clamping piece, and two ends of the first steel support are respectively located in the open slot.
Preferably, a steel angle support is arranged at the joint of the steel support and the steel lattice column.
Compared with the prior art, the beneficial effects of the utility model are that:
the excavation support special for the excavation foundation pit above the tunnel can reduce disturbance of excavation of the foundation pit to the tunnel, and is low in manufacturing cost, short in construction period and low in construction difficulty.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic sectional view of an excavation-time section of an excavation supporting structure;
FIG. 2 is a schematic cross-sectional view of portion A of FIG. 1;
FIG. 3 is a schematic view of a cast-in-situ bored pile;
FIG. 4 is a schematic view of a lattice stake;
FIG. 5 is a view showing a foundation treatment.
Wherein: 1. the method comprises the following steps of a two-way tunnel, 2. A bored pile, 3. A lattice column pile, 4. A steel lattice column, 5. A connecting beam, 6. A first steel support, 7. A second steel support, 8. A third steel support, 9. A first excavation surface, 10. A second excavation surface, 11. A third excavation surface, 12. A steel purlin, 13. A base, 14. A crown beam, 15. A reinforcement cage, 16. A stirrup, 17. A batten plate, 18. A steel angle brace, 19. Cement replacement, 20. A plain concrete rigid pile and 21. A clamping cylinder.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The embodiment is as follows:
referring to the attached drawings 1-5, an excavation supporting structure of tunnel top foundation ditch excavation, including two- way tunnel 1, 1 both sides of two-way tunnel are provided with bored concrete pile 2, be provided with lattice column pile 3 in the middle of the two-way tunnel 1, be provided with steel lattice column 4 on the lattice column pile 3, 4 tops of steel lattice column are provided with even roof beam 5 along two-way tunnel tunnelling direction and connect, are provided with the multilayer steel shotcrete along the excavation direction in the foundation ditch to take place to collapse to the foundation ditch when avoiding excavating the both sides soil body, the steel shotcrete sets up and all is connected with bored concrete pile 2 in the top of 1 excavation face of two-way tunnel and both ends.
In this embodiment, the bored pile 2 includes a steel casing and a reinforcement cage 15, the steel casing is driven into the pile forming area and then drilled by a rotary drilling machine, the reinforcement cage 15 is placed in the hole after the drilling, a hoop 16 is bound to an outer ring of the reinforcement cage 15, a part of the top of the reinforcement cage 15 extends to form a crown beam 14, and then concrete is poured into the reinforcement cage 15 to form the bored pile 2.
In the present embodiment, the lattice-type piles 3 are cast in reinforced concrete.
In the present embodiment, the steel lattice column 4 is formed by welding four equal angle steels and the gusset plate 17, and the four faces of the steel lattice column 4 are all fully welded.
In this embodiment, the pile-forming area is first hollowed by hand, then a rotary drilling machine is used to perform hole-forming construction, a hole is expanded and cleaned below, a reinforcement cage is hoisted in the expanded area, and concrete is poured to form the lattice column pile 3. And then, hoisting the steel lattice column 4 above the lattice column pile through a positioning funnel, and finally pouring concrete after the steel lattice column 4 is hoisted and placed and the positioning mortise and tenon device are matched. All steel lattice columns 4 are connected by a connecting beam 5.
In this embodiment, from the construction of the downward excavation of follow, multilayer steel shotcrete includes from last to first steel shotcrete 6, second steel shotcrete 7 and the third steel shotcrete 8 of interval setting in proper order down, and first steel shotcrete 6 sets up in excavation face 9 top 0.5m department for the first time, and second steel shotcrete 7 sets up in excavation face 10 top 0.5m department for the second time, and third steel shotcrete 8 sets up in excavation face 11 top 0.5m department for the third time, the both ends of first steel shotcrete 6 set up on joint spare, joint spare is fixed to be set up on bored concrete pile 2, joint spare is transversely installed at the joint section of thick bamboo 21 of 2 upper ends of bored concrete pile, and its upper end has seted up the open slot, the both ends of first steel shotcrete 6 are located the open slot respectively. And steel surrounding edges 12 are arranged at two ends of the second steel support 7 and the third steel support 8, the steel surrounding purlins 12 are longitudinally welded on the cast-in-situ bored pile, and the second steel support 7 and the third steel support 8 are connected with the steel surrounding purlins 12.
In this embodiment, the clamping piece is a clamping barrel 21 transversely installed at the upper end of the cast-in-situ bored pile 2, an open slot is formed in the upper end of the clamping piece, and two ends of the first steel support 6 are respectively located in the open slot.
In this embodiment, steel gussets 18 are provided where the steel struts join the steel lattice columns 4.
In this embodiment, after the foundation bottom surface is excavated, two schemes are adopted for reinforcing the foundation: the foundation above the subway tunnel is reinforced by plain concrete rigid piles, the plain concrete rigid piles 20 are arranged in a quincunx shape, the pile distance is 2m, the vertical reinforcing depth is within 3m below the bottom of the foundation pit, the soil body mainly comprises medium sand and silty clay, the pile is formed by a method of pumping concrete in a pipe through long spiral drilling, and three pile lengths are adopted according to the difference of the filling thickness of the miscellaneous parts of the foundation pit. And the other positions adopt a method of replacing and filling cement 19 to carry out foundation reinforcement.
The utility model discloses construction flow:
the first step is as follows: the required place of the construction theme is enclosed, the place is leveled, the foundation pit dewatering, the bored concrete pile, the upright pile and the pile foundation, the pile top cast-in-place beam, the soil retaining plate and the like are constructed.
The second step is that: and (5) excavating a foundation pit and constructing a first support.
The third step: and excavating to 0.5m of the bottom of each support from top to bottom in sequence, and constructing the steel purlin, the second steel pipe support and the third steel pipe support.
The fourth step: and excavating to the bottom of the foundation pit to construct a bottom plate and a side wall and prevent water.
The fifth step: and erecting and supporting.
And a sixth step: and (5) removing the third steel support.
The seventh step: and (4) removing the replacement support, the second support and the first support in sequence, and backfilling after being removed, wherein the backfilled soil meets the design requirement and the compaction coefficient can be removed from the lower support.
Eighth step: and removing the rest latticed columns, backfilling and covering soil, and restoring the pavement.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an excavation supporting construction of tunnel top foundation ditch excavation, includes two-way tunnel (1), its characterized in that: two-way tunnel (1) both sides are provided with bored concrete pile (2), be provided with lattice column pile (3) in the middle of two-way tunnel (1), be provided with steel lattice column (4) on lattice column pile (3), steel lattice column (4) top is provided with even roof beam (5) along two-way tunnel (1) tunnelling direction and connects, is provided with the multilayer steel shotcrete along the excavation direction in the foundation ditch, the steel shotcrete sets up and all is connected with bored concrete pile (2) in the top and both ends of two-way tunnel (1) excavation face.
2. The excavation supporting structure of excavation of a foundation pit above a tunnel according to claim 1, wherein: the cast-in-situ bored pile (2) comprises a steel casing and a reinforcement cage (15), the steel casing is driven into a pile forming area and then drilled, the reinforcement cage (15) is placed in a hole, stirrups (16) are arranged on the outer ring of the reinforcement cage (15), a crown beam (14) extends from the top of the reinforcement cage (15), and concrete is poured into the reinforcement cage (15) to form the cast-in-situ bored pile (2).
3. The excavation supporting structure for excavation of a foundation pit above a tunnel according to claim 1, wherein: the steel lattice column (4) is formed by welding four equal-edge angle steels and batten plates (17).
4. The excavation supporting structure of excavation of a foundation pit above a tunnel according to claim 1, wherein: multilayer steel shotcrete includes from last first steel shotcrete (6), second steel shotcrete (7) and the third steel shotcrete (8) of interval setting down in proper order, and every way steel shotcrete all sets up in every layer excavation face top 0.5m department, the both ends of first steel shotcrete (6) set up on joint spare, joint spare is fixed to be set up on drilling bored concrete pile (2), the both ends of second steel shotcrete (7) and third steel shotcrete (8) all are provided with steel and enclose arris (12).
5. The excavation supporting structure of excavation of a foundation pit above a tunnel of claim 4, wherein: the clamping piece is a clamping barrel (21) transversely installed at the upper end of the cast-in-situ bored pile (2), an open slot is formed in the upper end of the clamping piece, and two ends of the first steel support (6) are respectively located in the open slot.
6. The excavation supporting structure for excavation of a foundation pit above a tunnel according to claim 1, wherein: and a steel angle brace (18) is arranged at the joint of the steel support and the steel lattice column (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221179202.3U CN217870505U (en) | 2022-05-16 | 2022-05-16 | Excavation supporting construction of tunnel top foundation ditch excavation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221179202.3U CN217870505U (en) | 2022-05-16 | 2022-05-16 | Excavation supporting construction of tunnel top foundation ditch excavation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217870505U true CN217870505U (en) | 2022-11-22 |
Family
ID=84091295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221179202.3U Active CN217870505U (en) | 2022-05-16 | 2022-05-16 | Excavation supporting construction of tunnel top foundation ditch excavation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217870505U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117266184A (en) * | 2023-11-22 | 2023-12-22 | 中交第一航务工程局有限公司 | Large-size bearing platform cofferdam structure and large-size bearing platform construction method |
-
2022
- 2022-05-16 CN CN202221179202.3U patent/CN217870505U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117266184A (en) * | 2023-11-22 | 2023-12-22 | 中交第一航务工程局有限公司 | Large-size bearing platform cofferdam structure and large-size bearing platform construction method |
| CN117266184B (en) * | 2023-11-22 | 2024-01-30 | 中交第一航务工程局有限公司 | Large-size bearing platform cofferdam structure and large-size bearing platform construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20140026518A1 (en) | Construction method for root-type foundation anchorage and bored, root-type cast in-situ pile with anchor bolts | |
| CN112554198B (en) | Construction method of deep foundation pit protection structure adjacent to high-rise building | |
| CN111778793B (en) | Cavity collapse prevention and control structure and construction method | |
| CN110306593A (en) | A kind of station construction method | |
| CN212866028U (en) | River course limit sewage pipe network combines sheet-like barricade arrangement structure of stake | |
| CN112031814B (en) | Cave-entering construction method for crossing shallow-layer high-load highway | |
| CN217870505U (en) | Excavation supporting construction of tunnel top foundation ditch excavation | |
| CN114482099A (en) | Steel sheet pile cofferdam construction method | |
| CN214245694U (en) | Pile forming system for large-diameter cast-in-situ bored pile in karst area | |
| CN212175751U (en) | Integrated steel reinforcement cage for combined construction of underground continuous wall and cast-in-situ bored pile | |
| CN116464035A (en) | Construction method for replacing underground structure internal pile with column | |
| CN216339582U (en) | Combined inclined support for foundation pit support | |
| CN115787642A (en) | Construction method suitable for drilling covering layer easy to collapse | |
| CN212296394U (en) | Control structure for long-term settlement of shield or pipe-jacking tunnel | |
| CN103711130A (en) | Portal frame type bamboo joint mortar pile enclosure structure and construction method thereof | |
| CN112609731A (en) | Flexible permeable cutting retaining wall and construction method | |
| CN112664203A (en) | Reinforcing system for controlling deformation of shield tunnel by dredging river above shield tunnel and construction method | |
| CN115198787B (en) | Steel tube column type tower crane foundation and construction method thereof, and cover-excavation reverse construction method | |
| CN217150193U (en) | Sack stake of adjustable sack position framework of steel reinforcement | |
| CN219080388U (en) | Pier circular deep foundation | |
| CN214831860U (en) | Structure for improving bearing capacity of pier | |
| CN218175855U (en) | Storehouse section of thick bamboo type secant pile underground lattice wall underground structure for protecting foundation pit | |
| CN215669539U (en) | PHC precast tubular pile and steel lattice column combined diagonal brace | |
| CN110258621B (en) | Assembled retaining wall convenient to quick construction | |
| CN212294642U (en) | Pre-reinforcing retaining wall structure of manual hole digging pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |