CN104404967A - Rigid frame foundation pit support structure and construction method - Google Patents
Rigid frame foundation pit support structure and construction method Download PDFInfo
- Publication number
- CN104404967A CN104404967A CN201410696503.7A CN201410696503A CN104404967A CN 104404967 A CN104404967 A CN 104404967A CN 201410696503 A CN201410696503 A CN 201410696503A CN 104404967 A CN104404967 A CN 104404967A
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- China
- Prior art keywords
- rigid frame
- foundation pit
- column
- short beam
- campshed
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention discloses a rigid frame foundation pit support structure and a construction method. The structure comprises a soil-retaining and water-stopping pile, a boundary beam connected with the soil-retaining and water-stopping pile, a rigid frame structure arranged in a foundation pit, and a temporary pile connected with the inner edge of the rigid frame structure, wherein the rigid frame structure consists of long beams and short beams which intersect, and stand columns arranged on joints of the long beams and the short beams; inclined rods are connected between the joints of the long beams and the short beams, and the opposite angles in the vertical plane of the same short beams in the next layer of the joints of the long beams and the short beams; the short beams close to the edge of the foundation pit are connected with the boundary beam; and the stand columns has a lattice steel structure or steel tubes, and is connected by lower columns arranged below the elevation of the foundation pit and upper columns arranged above the elevation of the foundation pit. According to rigid frame foundation pit support structure, the number of inner support structures and the stand columns can be reduced, a large space for excavation is provided, the construction cost is reduced, and the investment is saved.
Description
Technical field
The invention belongs to civil construction project field, relate to a kind of foundation pit supporting project, particularly a kind of rigid frame posture internal support of foundation pit structure and construction method.
Background technology
At present in foundation pit supporting construction, generally have employed inner supporting structure, traditional inner supporting structure mostly is support or angle brace, and the support of this form needs a large amount of columns, and investment cost is larger, construction period is longer, but also bring great inconvenience to shoveling, shoveling expense is increased, and the duration of cutting the earth increases, therefore reducing inner support is reduce pattern foundation pit supporting structure cost, the effective means of reduction of erection time.
Summary of the invention
technical problem:object of the present invention aims to provide a kind of quantity, the quantity that reduces column that can reduce inner support, large space is provided to shoveling, thus reduction construction costs, the rigid frame posture internal support of foundation pit structure of investment reduction, provides a kind of construction method of this braced structures simultaneously.
technical scheme:rigid frame posture internal support of foundation pit structure of the present invention is arranged along foundation ditch surrounding, comprise the gear soil sealing campshed being arranged at foundation ditch periphery, the side bar be connected with the native sealing campshed of gear, be arranged on the rigid frame structure in foundation ditch, the interim campshed be connected with described rigid frame structure inside edge, described rigid frame structure is by the long beam intersected and short beam, the column being arranged on described long beam and short beam crossed node place is formed, the node that long beam and short beam intersect and its lower one deck in same short beam perpendicular to corner node between be connected with brace, the short beam of next-door neighbour's margin of foundation pit is also connected with side bar, column adopts latticed steel structure or steel pipe, is formed by connecting with the upper prop being arranged on more than hole end absolute altitude by the lower prop being arranged on below hole end absolute altitude.
In the preferred version of rigid frame posture internal support of foundation pit structure of the present invention, arrange the long beam of multilayer and short beam in described rigid frame structure, every layer long beam is all connected with column with the node of short beam.
In the preferred version of rigid frame posture internal support of foundation pit structure of the present invention, arrange the long beam of individual layer and short beam in rigid frame structure, the lower end of described brace is connected with the column at foundation ditch bottom surface place and side bar.
In the preferred version of rigid frame posture internal support of foundation pit structure of the present invention, the position of long beam, short beam and column in rigid frame structure, absolute altitude, sectional dimension and mechanical characteristic are determined according to the designing requirement of basement and parameter.
In the preferred version of rigid frame posture internal support of foundation pit structure of the present invention, the paxilla being positioned at below absolute altitude at the bottom of foundation ditch is provided with below base plate, base plate and column, brace and gear soil sealing campshed is connected also together builds, and described paxilla to be inserted in soil layer and is mounted in base plate.
In the present invention, long beam arranges and parallels with side bar, short beam arrange and side bar perpendicular, to build into both intersections of side bar at short beam and be integrated.
When each layer absolute altitude of rigid frame posture internal support of foundation pit structure of the present invention is consistent with basement each layer absolute altitude, and column and basement post are apart from identical, when long beam in structure, short beam are consistent with the design parameters of each respective members of characteristic and basement structure with the sectional dimension of column, rigid frame posture internal support of foundation pit structure just can double as basement structure, thus eliminate column, eliminate short beam and Chang Liang, uniting two into one of this basement structure and rigid frame posture internal support of foundation pit structure, save investment greatly, shorten the duration.
Topmost one deck side bar is arranged on the top keeping off native sealing campshed usually, and is fixedly connected with; All the other side bars are arranged on the waist keeping off native sealing campshed, and long beam, short beam and brace are all crossing with column and be fixedly connected with, and long beam, short beam, the brace number of plies vertically can be individual layer, multilayer, is specifically determined by calculating.
Not do not limit the columns of column in the present invention, comprise in other words one across and the situation of multispan rigid frame, the Pin number of concrete framework is determined by calculating.
The lower prop of column is arranged on below hole end absolute altitude, and upper prop is arranged on more than hole end absolute altitude, and upper prop adopts latticed steel structure or steel pipe.
In order to improve the rigidity of rigid frame posture inner supporting structure further, reduce the distortion of supporting and protection structure, soil excavation on earth after, some paxillas can be squeezed in the soil below basement according to design, and these paxillas are built and is mounted in basement bottom board, together with namely basement bottom board is cast in column, brace, gear soil sealing campshed and paxilla, define an entirety, the quantity of paxilla, length, arrangement and position are determined by designing and calculating, do not limit by schematic diagram.
The construction method of rigid frame posture internal support of foundation pit structure of the present invention, its concrete steps are:
1) the native sealing campshed of gear, column and interim campshed are constructed in construction;
2) earth excavation is to column, interim campshed with to keep off the stake top mark of native sealing campshed high;
3) the pouring construction long beam of one deck, short beam and side bar topmost;
4) cut the earth downwards to keeping off between native sealing campshed, until the end absolute altitude of the long beam of the second layer at interim campshed.
5) the long beam of the construction second layer, short beam, side bar, and the brace between first floor short beam and second layer short beam;
6) by above-mentioned steps 2)-5) continue construction, until absolute altitude at the bottom of earth excavation to foundation ditch, construct whole rigid frame structure;
7) all the other earthwork in excavation pit, and reclaim interim campshed, build basement bottom board;
8) successively to construct from bottom to top basement, and remove rigid frame structure.
In the preferred version of construction method of the present invention, when removing rigid frame structure in step 8), if utilize rigid frame structure as basement structure ingredient, then retain long beam, short beam and column, only remove brace, otherwise long beam, short beam, column and brace are all removed.
In the preferred version of construction method of the present invention, in step 6) after absolute altitude at the bottom of earth excavation to foundation ditch, also construct bottom foundation ditch paxilla and bottom one deck brace, and build base plate.
beneficial effect:compared with traditional foundation pit supporting construction, the present invention has the following advantages:
Rigid frame posture internal support of foundation pit structure of the present invention, decreases the quantity of support and column, thus decreases engineering quantity, reduce construction investment and shorten the duration, simultaneously because inner support has been lacked, cut the earth little by the impact of inner support, the expense of shoveling and time all can reduce; When each layer absolute altitude of rigid frame posture internal support of foundation pit structure of the present invention is consistent with basement each layer absolute altitude, and column and basement structure post are apart from time consistent, rigid frame posture internal support of foundation pit structure can double as basement structure, makes the two unite two into one, further investment reduction, the reduction of erection time.
Accompanying drawing explanation
Fig. 1 is rigid frame posture internal support of foundation pit structural plan schematic diagram.
Fig. 2 be soil excavation between interim campshed and gear soil sealing campshed on earth time rigid frame generalized section.
Fig. 3 is that rigid frame completes, all the other soil excavations rear rigid frame generalized section on earth in hole.
Have in figure: column 1, long beam 2, short beam 3, brace 4, interim campshed 5, keep off native sealing campshed 6, side bar 7, base plate 8, paxilla 9, lower prop 11, upper prop 12.
Detailed description of the invention
Below in conjunction with Figure of description and embodiment, technical scheme of the present invention is described in further details.
Rigid frame posture internal support of foundation pit structure of the present invention is arranged along foundation ditch surrounding, comprise the gear soil sealing campshed 6 being arranged at foundation ditch periphery, the side bar 7 be connected with the native sealing campshed 6 of gear, be arranged on the rigid frame structure in foundation ditch, the interim campshed 5 be connected with described rigid frame structure inside edge, described rigid frame structure is by the long beam 2 intersected and short beam 3, the column 1 being arranged on described long beam 2 and short beam 3 crossed node place is formed, the node that long beam 2 and short beam 3 intersect and its lower one deck in same short beam 3 perpendicular to corner node between be connected with brace 4, the short beam 3 of next-door neighbour's margin of foundation pit is also connected with side bar 7 with long beam 2,
Described column 1 adopts latticed steel structure or steel pipe, is formed by connecting with the upper prop 12 being arranged on more than hole end absolute altitude by the lower prop 11 being arranged on below hole end absolute altitude.
In the preferred embodiment of rigid frame posture internal support of foundation pit structure of the present invention, arrange the long beam 2 of multilayer and short beam 3 in described rigid frame structure, every layer long beam 2 is all connected with column 1 with the node of short beam 3.
In the another kind of preferred embodiment of rigid frame posture internal support of foundation pit structure of the present invention, arrange the long beam 2 of individual layer and short beam 3 in rigid frame structure, the lower end of described brace 4 is connected with side bar 7 with the column 1 at foundation ditch bottom surface place.
In the preferred embodiment of rigid frame posture internal support of foundation pit structure of the present invention, the position of the long beam 2 in rigid frame structure, short beam 3 and column 1, absolute altitude, sectional dimension and mechanical characteristic are determined according to the designing requirement of basement and parameter, and mechanical characteristic here refers to bending resistance, the shear resistant capacity in cross section.
In the preferred version of rigid frame posture internal support of foundation pit structure of the present invention, base plate 8 is below provided with the paxilla 9 being positioned at below absolute altitude at the bottom of foundation ditch, base plate 8 and column 1, brace 4 and keep off native sealing campshed 6 and be connected and also together build, and described paxilla 9 is inserted in soil layer.
In the present invention, long beam arranges and parallels with side bar, and short beam arranges with side bar perpendicular.
When each layer absolute altitude of rigid frame posture internal support of foundation pit structure of the present invention is consistent with basement each layer absolute altitude, and column and basement post are apart from identical, when long beam in structure, short beam are consistent with the design parameters of each respective members of mechanical characteristic and basement structure with the sectional dimension of column, rigid frame posture internal support of foundation pit structure just can double as basement structure, thus eliminate column, eliminate short beam and Chang Liang, uniting two into one of this basement structure and rigid frame posture internal support of foundation pit structure, save investment greatly, shorten the duration.
Topmost one deck side bar is arranged on the top keeping off native sealing campshed 6 usually, and is fixedly connected with; All the other side bars are arranged on the waist keeping off native sealing campshed, and long beam 2, short beam 3 and brace 4 are all crossing with column 1 and be fixedly connected with, and long beam, short beam, the brace number of plies vertically can be individual layer, multilayer, is specifically determined by calculating.
Not do not limit the columns of column 1 in the present invention, comprise in other words one across and the situation of multispan rigid frame, the Pin number of concrete framework is determined by calculating.
The lower prop 11 of column 1 is arranged on below hole end absolute altitude, and upper prop 12 is arranged on more than hole end absolute altitude, and upper prop 12 adopts latticed steel structure or steel pipe.
In order to improve the rigidity of rigid frame posture inner supporting structure further, reduce the distortion of supporting and protection structure, soil excavation on earth after, some paxillas 9 can be squeezed in the soil below basement according to design, and these paxillas are cast in basement bottom board, together with namely basement bottom board is cast in column, brace, gear soil sealing campshed and paxilla, define an entirety, the quantity of paxilla, length, arrangement and position are determined by designing and calculating, do not limit by schematic diagram.
The construction method of rigid frame posture internal support of foundation pit structure of the present invention, its concrete steps are:
1) the native sealing campshed 6 of gear, column 1 and interim campshed 5 are constructed in construction;
2) earth excavation is to column 1, interim campshed 5 with to keep off the stake top mark of native sealing campshed 6 high;
3) the pouring construction long beam 2 of one deck, short beam 3 and side bar 7 topmost;
4) cut the earth downwards, until the end absolute altitude of the long beam 2 of the second layer between the native sealing campshed 6 of gear at interim campshed 5.
5) the long beam 2 of the construction second layer, short beam 3, side bar 7, and the brace 4 between first floor short beam and second layer short beam;
6) by above-mentioned steps 2)-5) continue construction, until absolute altitude at the bottom of earth excavation to foundation ditch, construction paxilla 9, builds base plate 8, has constructed whole rigid frame structure;
7) all the other earthwork in excavation pit, and reclaim interim campshed 5, build basement bottom board 8;
8) successively to construct from bottom to top basement, and remove rigid frame structure.
In the preferred version of construction method of the present invention, when removing rigid frame structure in step 8), if utilize frame construction as basement structure ingredient, then retain long beam 2, short beam 3 and column 1, only remove brace 4, otherwise long beam 2, short beam 3, column 1 and brace 4 are all removed.
In the preferred version of construction method of the present invention, in step 6) after absolute altitude at the bottom of earth excavation to foundation ditch, also construct bottom foundation ditch paxilla 9 and bottom one deck brace 4, and build base plate.
Above-described embodiment is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention; some improvement and equivalent replacement can also be made; these improve the claims in the present invention and are equal to the technical scheme after replacing, and all fall into protection scope of the present invention.
Claims (8)
1. a rigid frame posture internal support of foundation pit structure, it is characterized in that, this braced structures is arranged along foundation ditch surrounding, comprise gear soil sealing campshed (6) being arranged at foundation ditch periphery, the side bar (7) be connected with the native sealing campshed (6) of gear, be arranged on the rigid frame structure in foundation ditch, the interim campshed (5) be connected with described rigid frame structure inside edge, described rigid frame structure is by the long beam (2) intersected and short beam (3), the column (1) being arranged on described long beam (2) and short beam (3) crossed node place is formed, the node that long beam (2) and short beam (3) intersect and its time one deck be positioned at same short beam (3) perpendicular to being connected with brace (4) between corner node, the short beam (3) of next-door neighbour's margin of foundation pit is also connected with side bar (7),
Described column (1) adopts latticed steel structure or steel pipe, by being arranged on the lower prop (11) of below hole end absolute altitude and being arranged on the upper prop (12) of cheating more than end absolute altitude and being formed by connecting.
2. rigid frame posture internal support of foundation pit structure according to claim 1, is characterized in that, arranges the long beam of multilayer (2) and short beam (3) in described rigid frame structure, and every layer long beam (2) is all connected with column (1) with the node of short beam (3).
3. rigid frame posture internal support of foundation pit structure according to claim 1, is characterized in that, arranges the long beam of individual layer (2) and short beam (3) in described rigid frame structure, and the lower end of described brace (4) is connected with the column at foundation ditch bottom surface place and side bar.
4. the rigid frame posture internal support of foundation pit structure according to claim 1,2 or 3, it is characterized in that, the position of the long beam (2) in described rigid frame structure, short beam (3) and column (1), absolute altitude, sectional dimension and mechanical characteristic are determined according to the designing requirement of basement and parameter.
5. the rigid frame posture internal support of foundation pit structure according to claim 1,2 or 3, it is characterized in that, absolute altitude place at the bottom of described foundation ditch is provided with base plate (8), described base plate (8) is provided with the paxilla (9) being positioned at below absolute altitude at the bottom of foundation ditch below, base plate (8) and column (1), brace (4) and keep off native sealing campshed (6) and be connected and together build, described paxilla (9) to be inserted in soil layer and is mounted in base plate (8).
6. adopt a construction method for rigid frame posture internal support of foundation pit structure described in claim 1,2,3,4 or 5, it is characterized in that, the concrete steps of this construction method are:
1) the native sealing campshed (6) of gear, column (1) and interim campshed (5) are constructed in construction;
2) earth excavation is high to the stake top mark of column (1), temporarily campshed (5) and the native sealing campshed (6) of gear;
3) the pouring construction long beam of one deck (2), short beam (3) and side bar (7) topmost;
4) cut the earth downwards, until the end absolute altitude of the long beam of the second layer (2) to keeping off between native sealing campshed (6) at interim campshed (5);
5) the construction long beam of the second layer (2), short beam (3), side bar (7), and the brace (4) between first floor short beam and second layer short beam;
6) by above-mentioned steps 2) to 5) continue construction, until absolute altitude at the bottom of earth excavation to foundation ditch, construct whole rigid frame structure;
7) all the other earthwork in excavation pit, and reclaim interim campshed (5), build basement bottom board (8);
8) successively to construct from bottom to top basement, and remove rigid frame structure.
7. construction method according to claim 6, it is characterized in that, when removing rigid frame structure in described step 8), if utilize rigid frame structure as basement structure ingredient, then retain long beam (2), short beam (3) and column (1), only remove brace (4), otherwise long beam (2), short beam (3), column (1) and brace (4) are all removed.
8. the construction method according to claim 6 or 7, is characterized in that, in described step 6) after absolute altitude at the bottom of earth excavation to foundation ditch, and also construct bottom foundation ditch paxilla (9) and bottom one deck brace (4), and build base plate (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410696503.7A CN104404967B (en) | 2014-11-26 | 2014-11-26 | Rigid frame posture internal support of foundation pit structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410696503.7A CN104404967B (en) | 2014-11-26 | 2014-11-26 | Rigid frame posture internal support of foundation pit structure and construction method |
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| CN104404967A true CN104404967A (en) | 2015-03-11 |
| CN104404967B CN104404967B (en) | 2016-09-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110965586A (en) * | 2019-11-25 | 2020-04-07 | 中国十九冶集团有限公司 | Construction method of multi-layer basement structure of municipal road |
| CN113338296A (en) * | 2020-03-02 | 2021-09-03 | 浙江明思特建筑支护技术有限公司 | Connecting piece for foundation pit steel pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110965586A (en) * | 2019-11-25 | 2020-04-07 | 中国十九冶集团有限公司 | Construction method of multi-layer basement structure of municipal road |
| CN110965586B (en) * | 2019-11-25 | 2021-06-29 | 中国十九冶集团有限公司 | Construction method of multi-layer basement structure of municipal road |
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| CN113338296B (en) * | 2020-03-02 | 2022-05-13 | 浙江明思特建筑支护技术有限公司 | Connecting piece for foundation pit steel pipe |
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| CN104404967B (en) | 2016-09-21 |
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