CN112663619A - Foundation pit cover plate and support system construction method - Google Patents
Foundation pit cover plate and support system construction method Download PDFInfo
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- CN112663619A CN112663619A CN202011298062.7A CN202011298062A CN112663619A CN 112663619 A CN112663619 A CN 112663619A CN 202011298062 A CN202011298062 A CN 202011298062A CN 112663619 A CN112663619 A CN 112663619A
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- cover plate
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- template
- frame body
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- 238000010276 construction Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 23
- 239000004567 concrete Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 description 16
- 239000010410 layer Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
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Abstract
The invention relates to the technical field of building equipment, in particular to a foundation pit cover plate and support system construction method, which comprises the following steps: step 1) measuring paying-off and earth excavation; step 2), binding a support frame and installing a template; step 3), earth backfilling; step 4), pouring a cover plate cushion layer; step 5), binding a cover plate bracket body; step 6) support body and apron stake body are pour, replace the construction operation plane of adopting artifical set up the stake pocket template system to do, carry out the ligature of apron stake body and support body and apron stake body on the apron bed course at last and pour, whole construction, can use construction machinery backfill earthwork to replace artifical set up support effect construction supporting body as construction operation plane, whole process mechanization degree is high, construction cycle is short, the manual set up support of current large-span apron construction adoption has been solved, relate to high altitude construction, the risk is big, the mechanical operation rate is low, construction cost is high, the long problem of construction period.
Description
Technical Field
The invention relates to the technical field of subway construction, in particular to a foundation pit cover plate and a supporting system construction method.
Background
The length of a common subway station foundation pit is 200-300 m, the width is 18-22 m, the depth is 16-20 m, the span is small, and requirements of heavy stacking materials and traffic passage do not exist, so that the enclosure structure only adopts concrete supports and steel supports to be combined, a cover plate does not need to be arranged on the concrete supports and the steel supports, but aiming at the subway station with the foundation pit length larger than 400m and the width larger than 50m, the enclosure structure adopts three reinforced concrete truss supports, and the cover plate is arranged in a first support part area to stack the heavy materials and be used for traffic passage.
Conventionally, adopt full hall support construction as supporting operation plane, after supporting construction and accomplishing, set up full hall support construction apron again behind the 2m high earthwork of excavation, whole process, the construction progress is slow, relates to high altitude construction, and the risk is big, and mechanical operation rate is low, leads to construction cost height, and the construction period is long.
In summary, there is a need for a foundation pit cover plate and a construction method of a foundation pit cover plate support system.
Disclosure of Invention
The invention aims to: aiming at the problems that the existing large-span cover plate construction adopts manual support erection, and relates to high-altitude operation, high risk, low mechanical operation rate, high construction cost and long construction period, the construction method of the foundation pit cover plate supporting system is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a construction method of a supporting system comprises the following steps:
step 1) measurement of paying-off and earth excavation: carrying out foundation pit measurement and paying-off and foundation pit earthwork excavation according to the construction scheme;
step 2), binding of a support frame and installation of a template: binding reinforcing steel bars to form a support frame body, and arranging a template on the outer side of the support frame body;
step 3), earth backfilling: backfilling earthwork in a frame body formed by the template, and flattening the earthwork to enable the earthwork to be flush with the upper surface of the template;
step 4), pouring a cover plate cushion layer: pouring concrete on the upper surfaces of the earthwork and the template to form a cover plate cushion layer;
step 5) binding of a cover plate support body: binding steel bars on the upper surface of the cover plate cushion layer to form a cover plate support body;
step 6), pouring the support frame body and the cover plate support body: adopt concrete placement support frame body and apron stake frame body.
The method comprises the steps of measuring paying-off and foundation pit earthwork excavation according to a construction scheme, forming a support frame body serving as a protective enclosure structure by binding reinforcing steel bars, arranging a template on the outer side of the support frame body after the support frame body is manufactured, backfilling earthwork in a frame body formed by the template, flattening the earthwork, enabling the earthwork to be flush with the upper surface of the outer side template of the support body to form a construction operation plane for pouring a concrete cover plate cushion layer, replacing a construction operation plane formed by manually erecting a support frame template system, finally binding a cover plate support body on the cover plate cushion layer and pouring the support frame body and the cover plate support body, using the backfilled earthwork of a construction machine as the construction operation plane to replace manually erecting a support frame for constructing a construction supporting body, and achieving high mechanization degree and short construction period in the whole process, so that the problem that the manual erection of a support frame in the existing large-span cover, the risk is big, the mechanical operation rate is low, construction cost is high, the long problem of construction period.
Preferably, in the step 2), the steel bars of the support frame body and the steel bars of the cover plate support body are connected in a binding mode. The reinforcing steel bars of the cover plate bracket body are inserted in the middle of the reinforcing steel bars of the support bracket body, the space between the upper and lower rows of reinforcing steel bars of the support bracket body is properly enlarged when the reinforcing steel bars of the support bracket body are bound, the reinforcing steel bar binding position of the cover plate bracket body is reserved in advance, and smooth binding construction of the reinforcing steel bars of the cover plate bracket body in the later period can be guaranteed.
Preferably, in step 2), a plurality of supporting members are arranged on the outer side of the template. Before earth is backfilled in a frame body formed by the templates, a plurality of supporting pieces are arranged on the outer side of the templates, so that the problem of the pouring quality of the support body in the templates due to the fact that the earth extrudes the templates to deform and fall into the templates in the earth backfilling process can be solved.
Preferably, the supporting pieces are uniformly distributed along the extending direction of the template. The strength of the form and the ability to resist earth extrusion can be improved.
Preferably, the bottom and the top of the template are respectively provided with a backing plate. At the job site, because ground unevenness, through setting up the backing plate respectively at the bottom and the top of template, through the different position thickness differences of backing plate, can guarantee that the top and the bottom elevation at the different position of template are the same, as the reference of apron bed course construction, can guarantee that apron construction elevation is correct.
Preferably, the supporting member is fixedly connected with the part of the backing plate protruding out of the template.
Preferably, the step 4) is to arrange a floor glue layer at the upper end of the cover plate cushion layer.
Preferably, the supporting frame body is poured firstly in the step 6), then the cover plate frame body is poured, and a vibrator is adopted to vibrate the joint part of the supporting frame body and the cover plate frame body. When the supporting frame body and the cover plate frame body are poured, the supporting frame body is poured firstly, then the cover plate frame body is poured, and vibration operation is carried out at the joint position of the supporting frame body and the cover plate frame body, so that the construction quality of a concrete structure can be improved.
Preferably, the template is a wooden structural member.
The utility model provides a foundation ditch apron, the apron support body adopts double-deck two-way reinforcement to tie the shaping, just the concreting thickness of apron support body is 350 ~ 400 cm. The cover plate frame body is poured to be 350-400 cm in thickness, can bear uniform load of 20kPa, and can be used for stacking materials with large weight and meeting parking or traffic passing of cranes, pump trucks and earth moving vehicles.
Compared with the prior art, the invention has the advantages that: the invention relates to a foundation pit cover plate and a construction method of a supporting system, which measures paying-off and foundation pit earth excavation according to a construction scheme, adopts a binding reinforcing steel bar to form a supporting frame body as a protective enclosure structure, arranges a template on the outer side of the supporting frame body after the supporting frame body is manufactured, backfills in a frame body formed by the template, and flattens the earthwork to ensure that the earthwork is flush with the upper surface of an outer side template of the supporting frame body to form a construction operation plane for pouring a concrete cover plate cushion layer, replaces a construction operation plane which is manually built by adopting a supporting frame template system, finally, binds the cover plate support body on the cover plate cushion layer and pours the supporting frame body and the cover plate support body, can use the backfilled earthwork of a construction machine as the construction operation plane to replace the manual building of a support for construction of a construction supporting body, has high mechanization degree and short construction period, solves the problems that the manual building of a support is, the problems of high-altitude operation, high risk, low mechanical operation rate, high construction cost and long construction period are solved.
The beneficial effects of other embodiments of the application are as follows:
1. the reinforcing steel bars of the cover plate bracket body are inserted in the middle of the reinforcing steel bars of the support bracket body, the space between the upper and lower rows of reinforcing steel bars of the support bracket body is properly enlarged when the reinforcing steel bars of the support bracket body are bound, the reinforcing steel bar binding position of the cover plate bracket body is reserved in advance, and smooth binding construction of the reinforcing steel bars of the cover plate bracket body in the later period can be guaranteed.
2. Before earth is backfilled in a frame body formed by the templates, a plurality of supporting pieces are arranged on the outer side of the templates, so that the problem of the pouring quality of the support body in the templates due to the fact that the earth extrudes the templates to deform and fall into the templates in the earth backfilling process can be solved.
3. The supporting pieces are uniformly distributed along the extension direction of the template, so that the strength of the template and the capability of resisting the extrusion of earthwork can be improved.
4. At the job site, because ground unevenness, through setting up the backing plate respectively at the bottom and the top of template, through the different position thickness differences of backing plate, can guarantee that the top and the bottom elevation at the different position of template are the same, as the reference of apron bed course construction, can guarantee that apron construction elevation is correct.
5. When the supporting frame body and the cover plate frame body are poured, the supporting frame body is poured firstly, then the cover plate frame body is poured, and vibration operation is carried out at the joint position of the supporting frame body and the cover plate frame body, so that the construction quality of a concrete structure can be improved.
6. The cover plate frame body is poured to be 350-400 cm in thickness, can bear uniform load of 20kPa, and can be used for stacking materials with large weight and meeting parking or traffic passing of cranes, pump trucks and earth moving vehicles.
Drawings
FIG. 1 is a schematic view of the construction of the cover plate and earthwork of the foundation pit of the present invention;
FIG. 2 is a schematic structural view of a reinforced concrete cover plate according to the present invention;
fig. 3 is a schematic view of the construction of the formwork, bolster and support mounting of the present invention.
Reference numerals
1-reinforced concrete cover plate, 2-reinforced concrete support, 3-earthwork, 4-template, 5-base plate and 6-support piece.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The construction method of the foundation pit cover plate and the supporting system is shown in the attached drawings 1, 2 and 3, the cover plate is used as an important auxiliary construction component in the subway station construction process and has high quality requirements, the cover plate is mainly used for stacking materials, traffic passage, crane, pump truck and earth moving vehicle parking, 20kPa uniform load is comprehensively considered for foundation pits with the length being larger than 535.5m and the width being 71.4 m-80 m, the reinforced concrete cover plate 1 is 350mm thick, and double-layer bidirectional C25@150 main ribs are adopted.
Under the action of 20kpa of uniform load, the maximum bending moment value of the midspan reaches 1248 kN · m, the maximum bending moment value of the support reaches 2475kN · m, and the maximum shearing force value reaches 684 kN. The reinforcement ratio of the reinforced concrete support 2 is calculated according to the designed internal force value, and the following table is calculated:
checking and calculating the reinforced concrete cover plate 1: under the action of 20kpa of uniform load, the maximum bending moment value of the span and the maximum shearing force value borne by the reinforced concrete cover plate 1 reach 95 kN.m, the maximum bending moment value of the support reaches 107 kN.m, and the maximum shearing force value reaches 136 kN. The reinforcement ratio of the reinforced concrete cover plate 1 is calculated according to the designed internal force value, and the following table is calculated:
measuring paying-off and foundation pit earthwork excavation according to a construction scheme, adopting binding steel bars to form a support frame body as a protective enclosure structure, properly enlarging the distance between upper and lower rows of steel bars of the support frame body when binding the steel bars of the support frame body, reserving the binding position of the steel bars of the cover plate support body in advance, ensuring smooth binding construction of the steel bars of the cover plate support body at the later stage, arranging templates 4 at the outer side of the support frame body after the support frame body is manufactured, backfilling earthwork 3 between the templates 4, flattening the earthwork 3, enabling the earthwork 3 to be flush with the upper surface of the outer template 4 of the support body to form a construction operation plane for pouring a concrete cover plate cushion layer, replacing the construction operation plane which is formed by manually erecting a support template system, and when the cover plate cushion layer is poured, concentrating on the middle area of the construction operation plane to stack concrete and scraping the concrete to the whole operation plane, carefully treating the edges of the templates 4, not allowing concrete to enter the templates 4, avoiding influencing the quality of the supporting frame body, finally binding the cover plate bracket body on the cover plate cushion layer, inserting the reinforcing steel bars for binding the cover plate bracket body in the middle of the reinforcing steel bars of the supporting frame body, carefully controlling the thickness of a protective layer at the bottom of the reinforcing steel bars during binding of the reinforcing steel bars, avoiding the occurrence of exposed reinforcing steel bars of the cover plate due to uneven cover plate cushion layer and other reasons, when the supporting frame body and the cover plate bracket body are poured, firstly pouring the supporting frame body to form the reinforced concrete supports 2, then pouring the cover plate bracket body to form the reinforced concrete cover plate 1, and performing vibration operation at the joint part of the reinforced concrete supports 2 and the reinforced concrete cover plate 1, thus improving the construction quality of a concrete structure, curing the reinforced concrete cover plate 1 in time after pouring is finished, the construction machine backfill earthwork can be used as a construction operation plane to replace manual support erection for construction of a construction supporting body, high-altitude operation is not involved in construction with the backfill earthwork, no major potential safety hazard exists, the safety coefficient is high, and the backfill earthwork construction is adopted, the reinforced concrete cover plate and the reinforced concrete support are cast and formed at one time, so that a construction joint does not exist, the strength is high, the quality is good, the bearing capacity is high, the mechanization degree of the whole process is high, the construction period is short, and the problems that manual support erection is adopted in the existing large-span cover plate construction, high-altitude operation is involved, the risk is large, the mechanical operation rate is low, the construction cost is high, and the construction period.
Before backfilling earthwork 3 in a frame body formed by the template 4, a plurality of supporting pieces 6 are arranged on the outer side of the template 4, so that the problem of support body pouring quality in the template 4 caused by the fact that the template 4 is supported in the template 4 due to the fact that the earthwork extruding template 4 deforms in the backfilling process can be solved, and the supporting pieces 6 are uniformly distributed in the extending direction of the template, so that the strength of the template 4 can be improved, and the earthwork extruding resistance can be improved.
At the job site, because ground unevenness, through setting up backing plate 5 respectively at the bottom and the top of template 4, through the different position thickness difference of backing plate 5, can guarantee that the top and the bottom elevation at the different positions of template 4 are the same, as the reference of the construction of the 4 bed courses of apron, can guarantee that apron 4 construction elevation is correct.
The above embodiments are only used for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement of the present invention is made; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.
Claims (10)
1. A construction method of a supporting system is characterized in that: the method comprises the following steps:
step 1) measurement of paying-off and earth excavation: carrying out foundation pit measurement and paying-off and foundation pit earthwork excavation according to the construction scheme;
step 2), binding of a support frame and installation of a template: binding reinforcing steel bars to form a support frame body, and arranging a template on the outer side of the support frame body;
step 3), earth backfilling: backfilling earthwork (3) in a frame body formed by the template (4), and flattening the earthwork (3) to enable the earthwork (3) to be flush with the upper surface of the template (4);
step 4), pouring a cover plate cushion layer: pouring concrete on the upper surfaces of the earthwork (3) and the template (4) to form a cover plate cushion layer;
step 5) binding of a cover plate support body: binding steel bars on the upper surface of the cover plate cushion layer to form a cover plate support body;
step 6), pouring the support frame body and the cover plate support body: adopt concrete placement support frame body and apron stake frame body.
2. The construction method of a supporting system according to claim 1, characterized in that: in the step 2), the reinforcing steel bars of the support frame body are connected with the reinforcing steel bars of the cover plate support body in a binding mode.
3. The construction method of a supporting system according to claim 1, characterized in that: in the step 2), a plurality of supporting pieces (6) are arranged on the outer side of the template (4).
4. The construction method of a support system according to claim 3, characterized in that: the supporting pieces (6) are uniformly distributed along the extension direction of the template (4).
5. The construction method of a support system according to claim 4, wherein: and the bottom and the top of the template (4) are respectively provided with a backing plate (5).
6. The construction method of a support system according to claim 5, wherein: the supporting piece (6) is fixedly connected with the part of the backing plate (5) protruding out of the template (4).
7. The construction method of a supporting system according to claim 1, characterized in that: and 4) arranging a floor glue layer at the upper end of the cover plate cushion layer.
8. The construction method of a supporting system according to claim 1, characterized in that: and 6), pouring the support frame body firstly, pouring the cover plate frame body secondly, and vibrating the joint part of the support frame body and the cover plate frame body by adopting a vibrator.
9. The construction method of a supporting system according to any one of claims 1 to 8, characterized in that: the template (4) is a wooden structural member.
10. The utility model provides a foundation ditch apron which characterized in that: the apron support body adopts double-deck two-way reinforcement to bind the shaping, just the concreting thickness of apron support body is 350 ~ 400 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011298062.7A CN112663619A (en) | 2020-11-18 | 2020-11-18 | Foundation pit cover plate and support system construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011298062.7A CN112663619A (en) | 2020-11-18 | 2020-11-18 | Foundation pit cover plate and support system construction method |
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| CN112663619A true CN112663619A (en) | 2021-04-16 |
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| CN202011298062.7A Pending CN112663619A (en) | 2020-11-18 | 2020-11-18 | Foundation pit cover plate and support system construction method |
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2020
- 2020-11-18 CN CN202011298062.7A patent/CN112663619A/en active Pending
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|---|---|---|---|---|
| JPH06146311A (en) * | 1992-11-17 | 1994-05-27 | Ohbayashi Corp | Construction method of underground work by completely automatic building construction system |
| CN102505709A (en) * | 2011-11-03 | 2012-06-20 | 浙江天力建设集团有限公司 | Concrete-formwork-precast foundation construction method |
| CN102926403A (en) * | 2012-11-15 | 2013-02-13 | 中国建筑第八工程局有限公司 | Roof construction method by cover-excavation method |
| CN104264682A (en) * | 2014-09-11 | 2015-01-07 | 成都市第六建筑工程公司 | Anchor traction wall protection pile base layer concrete beam support pouring technology |
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| 张建华: "《坝工模板工 第2版》", 31 August 1997, 黄河水利出版社 * |
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