CN211421139U - Shield constructs well crown beam bearing structure - Google Patents
Shield constructs well crown beam bearing structure Download PDFInfo
- Publication number
- CN211421139U CN211421139U CN201921899776.6U CN201921899776U CN211421139U CN 211421139 U CN211421139 U CN 211421139U CN 201921899776 U CN201921899776 U CN 201921899776U CN 211421139 U CN211421139 U CN 211421139U
- Authority
- CN
- China
- Prior art keywords
- template
- crown beam
- support
- shield
- construction
- 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
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The utility model discloses a shield constructs well crown beam bearing structure, prop and steel pipe bracing including crown beam template, crown beam template is made by 12mm bamboo plywood, the template prop set up in the outside of crown beam template, the template props and is made by the square timber, the end of steel pipe bracing holds in the palm the support and is in on the square timber. The utility model discloses a shield constructs well crown beam bearing structure has guaranteed that the strict control soil body subsides and the foundation ditch warp in the work progress, has guaranteed to be rich in the anhydrous operation among the fine sand layer work progress of water powder, has guaranteed construction safety.
Description
Technical Field
The utility model relates to a construction field, in particular to shield constructs well crown beam bearing structure.
Background
The project civil engineering construction 06 contract segment of Beijing subway No. 17 is located in the sunny region of Beijing City, and the north street of south-rising Taiyang palace and the north-crossing of the middle street of Taiyang palace to the Beijing west station of subway No. 15, which is approximately in the south-north direction. The mark section comprises a station-to-station interval, a Sunggong-Tanjing-West station interval and a Tanjing-West station.
From the natural conditions (meteorological hydrology, geological conditions, hydrological conditions and engineering environment), the construction of the section has the following difficulties: (1) the safety of peripheral pipelines is ensured in the construction process, the excavation of a key foundation pit of the engineering construction can certainly cause the deformation of soil bodies around the adjacent foundation pit, the deformation of the soil bodies is uneven, and the excavation essentially influences the pipelines is caused by the displacement of the soil bodies caused by the excavation. The soil body displacement acts on the pipeline, so that the pipeline generates additional stress on one hand, and the pipeline is subjected to uneven settlement on the other hand. When the additional stress is greater than the tensile strength of the material, the pipeline will break and lose its ability to function. In addition, uneven settling of the pipeline will cause the joint angle to be too large, and when it exceeds the joint angle limit, the closed condition will not be maintained and leakage will occur. The water source pipe is a main water supply pipeline in Beijing, provides domestic water of 1/3 people near Beijing, and is an important life pipeline. The pipeline has high requirements on compression resistance and deformation, and soil body settlement and foundation pit deformation need to be strictly controlled in construction. (2) The foundation pit dewatering is made in the fine sand layer rich in water powder, which is a difficult point of the project, the bad foundation pit effects such as water seepage and sand flow among piles, sudden base gushing and the like are easy to occur during the construction, and the difficulty of the project is how to make the foundation pit dewatering and ensure the waterless operation. (3) The deep foundation pit excavation belongs to a subsection project with high risk, is organization expert demonstration before construction of the project, and is constructed according to an expert demonstration scheme strictly in the construction process. The foundation pit earthwork excavation is carried out by strictly observing the construction principle of 'vertical layering, supporting and excavating firstly', and the construction process is used for strengthening the enclosure structure and monitoring the surrounding buildings (structures).
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a shield constructs well crown beam bearing structure is provided, it has overcome prior art's above-mentioned difficulty.
The utility model discloses the technical problem that solve is realized through following technical scheme:
the utility model provides a shield constructs well crown beam bearing structure, includes crown beam template, template brace and steel pipe bracing, crown beam template is made by the thick bamboo offset plate of 12mm, the template brace set up in the outside of crown beam template, the template brace is made by the square timber, the end of steel pipe bracing is provided with the end and holds in the palm, the end holds in the palm the support and is in on the square timber.
Preferably, in the above technical scheme, the steel pipe bracing includes a plurality of vertically-erected steel pipes, the steel pipes are 4 layers, and the horizontal distance is 60 cm.
Preferably, in the above technical solution, the template support includes a template horizontal support and a template vertical support, the template horizontal support is 100mm × 100m square wood @250mm, and the template vertical support is 100mm × 100mm square wood @600 mm.
Preferably, in the above technical solution, the height difference of the joint between two adjacent formworks is not greater than 2 mm.
Preferably, in the above technical solution, the end support is a U-shaped support, and the U-shaped support is supported on the square timber.
The above technical scheme of the utility model, following beneficial effect has:
the utility model discloses a shield constructs well crown beam bearing structure has guaranteed that the strict control soil body subsides and the foundation ditch warp in the work progress, has guaranteed to be rich in the anhydrous operation among the fine sand layer work progress of water powder, has guaranteed construction safety.
Drawings
Fig. 1 is the utility model discloses a shield constructs well crown beam bearing structure's schematic diagram.
Detailed Description
The following detailed description of the present invention is provided to facilitate further understanding of the invention.
The utility model provides a shield constructs well crown beam bearing structure, includes crown beam template 1, template brace 2 and steel pipe bracing 3, and crown beam template 1 is made by 12mm thick bamboo offset plate, and template brace 2 sets up in crown beam template 1's the outside, and template brace 2 is made by the square timber, and the end of steel pipe bracing 3 is provided with the end and holds in the palm, and the end holds in the palm and supports on the square timber.
Specifically, steel pipe bracing 3 includes the steel pipe of many vertical erections, and preferred steel pipe is 4 layers, and the horizontal interval is 60 cm. The template support comprises a template horizontal support and a template vertical support, the template horizontal support is 100mm multiplied by 100m square timber @250mm, and the template vertical support is 100mm multiplied by 100mm square timber @600 mm. The height difference of the joint of the two adjacent templates is not more than 2 mm. Namely, the vertical back ridges are made of 100 multiplied by 100mm square wood with the spacing of 600mm, the horizontal back ridges are made of 100 multiplied by 100mm square wood with the spacing of 250 mm. Preferably, the end head support is a U-shaped support, and the U-shaped support is supported on the square timber.
A shield well and shaft deep foundation pit excavation safe construction method comprises the following steps:
1. and (3) supporting construction of the crown beam and the concrete:
(1) construction of No. 1 shield shaft crown beam and concrete support:
and the construction of the pile top crown beam and the retaining wall is carried out after the construction of the fender pile is finished. The construction of the fender pile is completed, the earthwork is excavated by taking off the cap, the pile head is broken before the construction of the crown beam, the circular cutting method is adopted for construction, the PVC pipe is sleeved outside the embedded steel bar before the concrete is poured on the fender pile, the insufficient contact between the steel bar and the concrete is ensured, and the convenience is provided for the circular cutting construction of the pile head. And after the pile head is broken, the construction of the crown beam is started. The size of the section of the crown beam is 1m (height) multiplied by 1m (width), the crown beam steel bars are bound on site, the template adopts a bamboo plywood, the support adopts a steel pipe inclined strut, after the construction of the crown beam is finished, a first concrete support is constructed, the support is 1m (height) multiplied by 1.2m in width and 16.2m in length, the support is arranged in the south-north direction, the concrete adopts commercial concrete, the concrete is poured by an automobile pump, and the concrete is vibrated by an insertion vibrator. And reserving concrete supporting steel bars during construction of the top beam.
The method comprises the following steps of excavating a crown beam and a concrete supporting earthwork by adopting an excavator, manually clearing and trimming a bottom, tamping a base, paving a bottom die, arranging a water retaining wall on the crown beam, and preventing rainwater from flowing backwards into a well mouth. The crown beam and the concrete supporting template adopt bamboo plywood with the thickness of 12mm, the surface of the template is cleaned and coated with a separant before the template is supported, the joint of the template is tight and does not leak slurry, and the height difference of the joint of two adjacent templates is not more than 2 mm. The template horizontal support adopts 100mm multiplied by 100mm square wood @250mm, and the vertical support adopts 100mm multiplied by 100mm square wood @600 mm; the horizontal interval of steel pipe is 60cm, and vertical 4 layers of erectting altogether, the end adds the U type and holds in the palm, props on the square timber, and the steel pipe support outward appearance should violently be flat vertical, forbids in disorder to prop and takes in disorder strictly. Template reinforcement is detailed in the following figures. The concrete is poured by C30 commercial concrete, and is compacted by vibration of an inserted vibrating rod.
(2) Construction of No. 2 shield well crown beam:
and the construction of the pile top crown beam and the retaining wall is carried out after the construction of the fender pile is finished. The construction of the fender pile is completed, the earthwork is excavated downwards by 1.16m to reach the designed elevation of the bottom of the crown beam, before the construction of the crown beam, the pile head is broken, the circular cutting method is adopted for construction, before the concrete is poured on the fender pile, the PVC pipe is sleeved outside the embedded steel bar, the insufficient contact between the steel bar and the concrete is ensured, and the convenience is provided for the circular cutting construction of the pile head. And after the pile head is broken, the construction of the crown beam is started. The size of the section of the crown beam is 1m (height) multiplied by 1m (width), the crown beam steel bars are bound on site, the template adopts a bamboo plywood, the support adopts a steel pipe inclined strut, the concrete adopts commercial concrete, the automobile pump is poured, and the plug-in vibrator vibrates. And reserving a steel support embedded steel plate during the construction of the top beam.
Excavating the earthwork of the crown beam by adopting an excavator, manually cleaning the bottom, trimming, tamping the base, then paving the bottom die, arranging a water retaining wall on the crown beam, and preventing rainwater from flowing back to the well mouth. The crown beam template adopts a bamboo plywood with the thickness of 12mm, the surface of the template is cleaned and coated with a separant before the template is supported, the joint of the template is tight and does not leak slurry, and the height difference of the joint of two adjacent templates is not more than 2 mm. The template horizontal support adopts 100mm multiplied by 100mm square wood @250mm, and the vertical support adopts 100mm multiplied by 100mm square wood @600 mm; the horizontal interval of steel pipe is 60cm, and vertical 4 layers of erectting altogether, the end adds the U type and holds in the palm, props on the square timber, and the steel pipe support outward appearance should violently be flat vertical, forbids in disorder to prop and takes in disorder strictly. Template reinforcement is detailed in the following figures. The concrete is poured by C30 commercial concrete, the inserted vibrating rod is vibrated to be compact, the crown beam formwork is erected and the formwork at the junction with the cover plate is erected as shown in the following figure, and the cover plate is arranged between the concrete support and the crown beam.
2. Construction of concrete retaining wall
And a 240mm wide reinforced concrete retaining wall is arranged at the top of the crown beam. The retaining wall adopts phi 16 thread steel bar double-layer arrangement, and the waterwall is arranged above the concrete support, and the height of the retaining wall exceeds the top elevation of the concrete support by 0.5 m. The concrete retaining wall template adopts a bamboo plywood with the thickness of 12mm, the surface of the template is cleaned and coated with a separant before the template is supported, the joint of the template is tight and does not leak slurry, and the height difference of the joint of two adjacent templates is not more than 2 mm. The template horizontal support adopts 100mm multiplied by 100mm square wood @300mm, and the vertical support adopts 100mm multiplied by 100mm square wood @600 mm; the horizontal interval of steel pipe 600mm, vertical 4 layers of erectting altogether, the end adds the U type and holds in the palm, props on square timber, and the steel pipe support outward appearance should violently be flat vertical, and the indiscriminate is propped in disorder. The concrete is poured by C30 commercial concrete, and is compacted by vibration of an inserted vibrating rod.
3. Earth excavation construction process
The earth excavation follows the basic principle of 'along with excavation and supporting', and takes mechanical excavation as a main part and manual matching as an auxiliary part. And (5) carrying out inter-pile net shotcrete and steel purlin and steel support construction along with earth excavation. No. 1 shield constructs the well and adopts the grab bucket to go out native, and No. 2 shield constructs the well and adopts the mode of portal crane perpendicular handling soil fill to go out native.
No. 1 shield shaft construction step:
the first step is as follows: constructing a fence, leveling the field, constructing a cast-in-situ bored pile, driving a dewatering well, excavating downwards to the elevation of the bottom of a crown beam, constructing a crown beam on the top of the pile and a brick retaining wall, excavating earthwork to a position 0.5m below a first concrete support, and constructing the first concrete support.
The second step is that: and excavating earthwork to a position 0.5m below the second and sixth steel supports in sequence, and constructing the second and sixth steel supports. And excavating to the substrate layer by layer after construction is finished.
The third step: pouring a bottom plate cushion layer and laying a waterproof layer; and constructing part of the side wall of the bottom plate to the position below the sixth steel support.
The fourth step: and removing the sixth steel support, laying a side wall waterproof layer, pouring part of the side wall to the position below the fifth support, and applying a first reverse support after the side wall reaches the strength required by the design. HL1 and HL3 are poured temporarily.
The fifth step: and (4) removing the fifth steel support, laying a side wall waterproof layer, and pouring a fourth waist beam and part of the side wall. And constructing a reverse support II after the side wall reaches the strength required by the design.
And a sixth step: and (3) removing the fourth steel support, laying a waterproof layer, pouring a third waist beam and part of side walls, constructing a small advanced guide pipe and a large advanced pipe shed between the two sides of the mining method area from the shield well, and constructing HL1 and HL3 after the construction is finished.
The seventh step: and removing the third steel support, laying a side wall waterproof layer, and pouring a second waist beam and part of the side wall.
And eighthly, dismantling the second steel support, laying a side wall waterproof layer and pouring the first waist beam.
And ninthly, when the ingate is excavated, detaching the first reverse support and the second reverse support, excavating the south mine method section firstly, and excavating the north mine method section 15-20 m behind the south mine method section. After the deformation of the initial support of the south mine method area is stable, a second lining structure and HL2 of the south area can be constructed firstly, after the second lining structure reaches the design strength, the shield starting can be carried out, and the second lining and HL4 of the north area can be constructed at a proper time. And (5) completing the construction of the main structure of the shield well, and constructing a left shield section after the excavation length of the mining method sections on the two sides is not less than 5 m.
And tenth, after the shield interval and the mining method interval are constructed, constructing a shield well structural plate, laying a roof waterproof layer, backfilling and covering soil below the first support, and backfilling the first support to the ground after the first support is removed.
No. 2 shield shaft construction step:
the first step is as follows: constructing a fence, leveling the field, driving a dewatering well, constructing a cast-in-situ bored pile, excavating downwards to the elevation of the bottom of a top beam, constructing the cast-in-situ bored pile, the top beam of the pile and a brick retaining wall, excavating earthwork to a position 0.5m below a first steel support, and constructing the first steel support.
The second step is that: and excavating earthwork to a position 0.5m below the second and sixth steel supports in sequence, and constructing the second and sixth steel supports. And excavating to the substrate layer by layer after construction is finished.
The third step: pouring a bottom plate cushion layer and laying a waterproof layer; and constructing part of the side wall of the bottom plate to the position below the sixth steel support.
The fourth step: and removing the sixth steel support, laying a side wall waterproof layer, and pouring part of the side wall. And after the side wall reaches the strength required by the design, applying a reverse support.
The fifth step: and (4) removing the fifth steel support, laying a side wall waterproof layer, and pouring a fourth waist beam and part of the side wall. And after the fourth waist rail reaches the strength required by the design, constructing a back-up support II.
And a sixth step: and (3) removing the fourth steel support, laying a waterproof layer, pouring the third waist beam and part of side walls, constructing a small advanced guide pipe and a large advanced pipe shed between the two sides of the mining method area from the shield well, and constructing HL1, HL3 and HL4 after the construction is finished.
The seventh step: and removing the third steel support, laying a side wall waterproof layer, and pouring a second waist beam and part of the side wall.
Eighth step: and (4) removing the second steel support, laying a side wall waterproof layer, pouring to the first waist beam, and gradually removing the sections on the two sides of the reversed-strut broken-hole excavation after the structure reaches the strength required by the design.
The ninth step: the method comprises the steps of firstly excavating a south mine method section, and excavating a north mine method section after excavating 15-20 m. After the deformation of the initial support of the south mine method area is stable, a second lining structure and HL2 of the south area can be constructed firstly, after the second lining structure reaches the design strength, the shield starting can be carried out, and the second lining, HL5 and the crossover line of the north area can be constructed at proper time.
The tenth step: and after the shield interval and the mining method interval are constructed, constructing a shield well structural plate, laying a roof waterproof layer, backfilling and covering soil.
Although the present invention has been described with reference to the above embodiments, it is not intended to limit the present invention, and various alternatives and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a shield constructs well crown beam bearing structure, its characterized in that, props and steel pipe bracing including crown beam template, crown beam template is made by the thick bamboo offset plate of 12mm, the template prop set up in the outside of crown beam template, the template props and is made by the square timber, the end of steel pipe bracing is provided with the end and holds in the palm, the end holds in the palm and supports on the square timber.
2. The shield well crown beam supporting structure according to claim 1, wherein the steel pipe diagonal brace comprises a plurality of vertically erected steel pipes, the steel pipes are 4 layers, and the horizontal distance is 60 cm.
3. The shield well crown beam supporting structure of claim 1, wherein the template support comprises a template horizontal support and a template vertical support, the template horizontal support is 100mm x 100m square wood @250mm, and the template vertical support is 100mm x 100mm square wood @600 mm.
4. The shield well crown beam supporting structure according to claim 1, wherein the height difference of the joint of two adjacent template is not more than 2 mm.
5. The shield well crown beam supporting structure according to claim 1, wherein the end head support is a U-shaped support supported on the square timber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921899776.6U CN211421139U (en) | 2019-11-05 | 2019-11-05 | Shield constructs well crown beam bearing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921899776.6U CN211421139U (en) | 2019-11-05 | 2019-11-05 | Shield constructs well crown beam bearing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211421139U true CN211421139U (en) | 2020-09-04 |
Family
ID=72274487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921899776.6U Active CN211421139U (en) | 2019-11-05 | 2019-11-05 | Shield constructs well crown beam bearing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211421139U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820756A (en) * | 2019-11-05 | 2020-02-21 | 中铁二十二局集团轨道工程有限公司 | Shield well and vertical shaft deep foundation pit excavation safety construction method |
-
2019
- 2019-11-05 CN CN201921899776.6U patent/CN211421139U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820756A (en) * | 2019-11-05 | 2020-02-21 | 中铁二十二局集团轨道工程有限公司 | Shield well and vertical shaft deep foundation pit excavation safety construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104612162B (en) | A kind of Deep Foundation Pit of Metro Stations excavation construction method | |
| CN103741714B (en) | Underground engineering full sheltered reverse excavation construction method | |
| CN107313431B (en) | Close on not contour foundation pit method for synchronously constructing | |
| CN102444142A (en) | Pile group column replacement expanded basement and construction method of same | |
| CN109371905B (en) | Dam and construction method | |
| CN110004991B (en) | Underground structure anti-floating system based on convex wing foot plate and construction method | |
| CN107542115A (en) | Underground project waterproof structure and its construction method | |
| CN106320120A (en) | Construction process for pile slab type non-soil roadbed highway | |
| CN108560536A (en) | The continuous piling wall construction method of Soil-cement | |
| CN109208545B (en) | Construction method of artificial landscape overflow dam with energy dissipation effect | |
| CN107700474A (en) | A kind of existing construction foundation reinforcement means and campshed formula diaphram wall | |
| CN205399474U (en) | Assemble cast -in -place formula reinforced earth retaining wall fast | |
| CN107119695A (en) | A kind of operation support body and construction method for cancelling outer wall of basement backfill | |
| CN110055973B (en) | Foundation pit enclosure structure under high-speed railway bridge with limited construction space and water stopping method | |
| CN211144503U (en) | High steep topography bridge tunnel meets section open cut tunnel and connects long structure | |
| CN102235007B (en) | Method for supporting deep foundation with upper nail-lower pile combination | |
| CN103334450B (en) | Construction method of pile precast slab retaining wall with drainage ditch | |
| CN110820756A (en) | Shield well and vertical shaft deep foundation pit excavation safety construction method | |
| CN109898556A (en) | A kind of underground pipe gallery structure and sunk type construction method | |
| CN104453915B (en) | Big cross section vertical shaft pre-pouring grout reinforces Rapid Excavation method | |
| CN207228173U (en) | A kind of underground project waterproof structure | |
| CN211421139U (en) | Shield constructs well crown beam bearing structure | |
| CN212272234U (en) | High-strength combined template for open groove section of large-section inclined shaft | |
| CN208803460U (en) | A kind of enhancing cement mixing method intercepts water the Prefabricated Concrete sheet pile of effect | |
| CN105484270A (en) | Reinforcement protection construction method of high steep old rubble retaining wall adjacent to deep foundation pit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |