CN212506301U - Support system in combination assembled forever - Google Patents

Support system in combination assembled forever Download PDF

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Publication number
CN212506301U
CN212506301U CN202021240305.7U CN202021240305U CN212506301U CN 212506301 U CN212506301 U CN 212506301U CN 202021240305 U CN202021240305 U CN 202021240305U CN 212506301 U CN212506301 U CN 212506301U
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steel
foundation pit
support system
support
wall
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CN202021240305.7U
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Inventor
周锋
吴晓风
胡锦
冯琰
应晔
吴欣之
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Shanghai Mechanized Construction Group Co Ltd
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Shanghai Mechanized Construction Group Co Ltd
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Abstract

The utility model discloses a permanent-temporary combined assembled inner support system, relating to the technical field of ultra-deep foundation pit engineering construction, comprising a foundation pit, wherein the inner wall of the foundation pit is provided with an underground continuous wall, and a plurality of steel supports are horizontally arranged in the foundation pit; and a part of permanent structure is arranged at the position, corresponding to the end part of the steel support, of the inner wall of the foundation pit, and a temporary structure is connected between the end part of the steel support and the part of permanent structure. To prior art have the problem that the construction process is many, maintenance duration is long, construction speed is slow, unable turnover utilizes, the utility model aims at providing a face to combine assembled interior support system forever, it has that construction speed is fast, the turnover uses green's advantage.

Description

Support system in combination assembled forever
Technical Field
The utility model relates to an ultra-deep foundation ditch engineering construction technical field, more specifically say, it relates to a face to combine assembled interior support system forever.
Background
With the continuous promotion of urban construction, the building foundation pit in the soft soil area or the foundation pit of the subway station will be deeper and deeper. Generally, for an ultra-deep foundation pit inner support system in a soft soil area, cast-in-place concrete supports and concrete purlins with high rigidity are mainly selected, and the method is safe and reliable. And the steel pipe support is generally only used in a shallow foundation pit due to smaller bearing capacity and poorer rigidity.
The concrete support and the purlin of the ultra-deep foundation pit mainly have the following defects:
1. after the structure is constructed, the concrete supports and the concrete purlins can only be chiseled off and cannot be recycled, and the construction concept is not consistent with the current green and environment-friendly construction concept;
2. the concrete supports and the concrete purlins used in the ultra-deep foundation pit have large section sizes and are difficult to remove, and heavy machinery is required to be matched with the concrete supports and the concrete purlins; the dismantling speed is slow, and the construction period is limited by the number of labor force and cutting equipment.
SUMMERY OF THE UTILITY MODEL
To prior art have the problem that the construction process is many, maintenance duration is long, construction speed is slow, unable turnover utilizes, the utility model aims at providing a face to combine assembled interior support system forever, it has that construction speed is fast, the turnover uses green's advantage.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a permanent-temporary combined assembled inner support system comprises a foundation pit, wherein an underground continuous wall is arranged on the inner wall of the foundation pit, and a plurality of steel supports are horizontally arranged in the foundation pit;
and a part of permanent structure is arranged at the position, corresponding to the end part of the steel support, of the inner wall of the foundation pit, and a temporary structure is connected between the end part of the steel support and the part of permanent structure.
According to the technical scheme, firstly, the steel support is adopted to erect the inner support system, and the steel support is prefabricated and processed in a factory, so that the construction efficiency is improved, and the construction period is shortened; secondly, adopt and face the support system that combines forever, utilize partial permanent structure wherein, support the support intensity and the firmness of support system in the reinforcing, be favorable to the safety of foundation ditch construction, rethread temporary structure conveniently dismantles the steel shotcrete, realizes reasonable adjustment, turnover and the reallocation of support structure spare in the underground on the one hand, and the support structure spare resource utilization is more reasonable, accords with green's theory, and on the other hand can make the horizontal braces demolish and do not occupy the key time limit for a project.
The present invention may be further configured in a preferred embodiment as: the part of the permanent structure comprises a steel plate strip fixed on the inner wall of the underground continuous wall, and the temporary structure is erected on the steel plate strip.
Through above-mentioned technical scheme, adopt the mode that hoist and mount erect, compare in traditional cement and pour the maintenance, the process is simpler, and the efficiency of construction is higher.
The present invention may be further configured in a preferred embodiment as: the partial permanent structure further comprises a hidden beam arranged on the inner wall of the underground continuous wall, an embedded part is arranged in the hidden beam, and one side of the steel plate strip is fixed on the embedded part.
Through above-mentioned technical scheme, be favorable to the lath to be connected with the hidden beam through burying the piece more firmly.
The present invention may be further configured in a preferred embodiment as: and a stiffening plate for enhancing the bearing strength of the steel plate strip is fixed between the steel plate strip and the embedded part.
Through the technical scheme, the stiffening plate is obliquely arranged between the steel plate strip and the embedded part to form a stable triangular supporting structure.
The present invention may be further configured in a preferred embodiment as: the temporary structure comprises a steel box girder fixed at the end part of the steel support, the steel box girder is erected on the steel lath, and a connecting layer is filled between the steel box girder and the partial permanent structure.
Through above-mentioned technical scheme, the connecting layer is filled, is compensatied the size interval between steel box girder and the partial permanent structure, plays the effect of temporary connection simultaneously.
The present invention may be further configured in a preferred embodiment as: the steel support is a steel pipe concrete pole.
The steel support is provided with a cutting unloading section, the cutting unloading section of the steel support is of a hollow structure, and a rib plate for reinforcement is arranged in the cutting unloading section.
Through the technical scheme, when the steel support is used, the widths of different positions in the foundation pit are different, the unloading section is cut off through the cutting part, and the length of the steel support is adjusted so as to adapt to horizontal supports with different lengths required by different positions in the foundation pit.
The present invention may be further configured in a preferred embodiment as: still vertically be provided with many steel-pipe columns in the foundation ditch, be fixed with on the steel-pipe column and be used for vertical support bracket the steel corbel of steel shotcrete.
Through above-mentioned technical scheme, the steel corbel is used for carrying out the support of vertical direction to the steel shotcrete, further strengthens the support intensity of interior support system.
A construction method of a permanent temporary combined assembled inner support system comprises the following steps:
s1, prefabricating a steel pipe concrete pipe, filling micro-expansion and self-compaction concrete in a plurality of sections of steel pipes, connecting by using flange joints to manufacture a steel support, and welding a steel box girder section at the end part of the steel support;
arranging a cutting unloading section at the non-standard section of the steel support, wherein a rib plate is adopted to replace filled concrete in the section of the steel pipe;
s2, after the foundation pit is dug to the bottom of the support, firstly constructing a lining wall section by using a template support, installing embedded parts and a reinforcement cage, and pouring concrete to form a hidden beam;
s3, welding the steel plate strips and the stiffening plates to the embedded parts;
s4, hoisting the steel support with the steel box girder section to a pair of steel laths;
s5, filling micro-expansion fine aggregate concrete or grouting material into a gap between the steel box girder and the lining wall, and welding steel plate strips on the steel plate above the steel box girder;
and S6, welding the plurality of steel box girder sections end to end, enclosing the plurality of steel box girder sections on the inner wall of the lining wall to form the steel concrete combined enclosing purlin of the steel box girder superposed concrete hidden girder, and forming the permanently-bound assembled inner support system.
According to the technical scheme, firstly, the steel support is adopted to erect the inner support system, and the steel support is prefabricated and processed in a factory, so that the construction efficiency is improved, and the construction period is shortened; secondly, adopt and face the support system that combines forever, be favorable to the safety of foundation ditch construction, conveniently dismantle the steel shotcrete, realize reasonable adjustment, turnover and the reallocation of support structure spare in the underground on the one hand, support structure spare resource utilization is more reasonable, accords with green's theory, and on the other hand can make horizontal brace demolish not occupy the key time limit for a project.
To sum up, the utility model discloses a following at least one useful technological effect:
(1) the inner support system is erected by adopting the steel supports, and the steel supports are prefabricated and processed in factories, so that the construction efficiency is improved, and the construction period is shortened;
(2) the enclosing purlin is a combined enclosing purlin combined by a permanent and temporary structure, namely the combined enclosing purlin combined by a permanent structure and a temporary structure, so that the safety of foundation pit construction is facilitated, the steel support is convenient to disassemble, reasonable adjustment, turnover and redistribution of the underground inner support structural part are realized on one hand, the resource utilization of the support structural part is more reasonable, the green and environment-friendly concept is met, and on the other hand, the horizontal support is dismantled without occupying a critical construction period;
(3) because the width of different positions department in the foundation ditch has the difference, through setting up the cutting uninstallation section of different length, the length of adjustment steel shotcrete to the horizontal brace of the required different length of different positions in the adaptation foundation ditch.
Drawings
FIG. 1 is a schematic view of a horizontal sectional structure of the present embodiment;
FIG. 2 is a schematic vertical sectional structure of the present embodiment;
fig. 3 is a schematic structural view of a portion a in fig. 2.
Reference numerals: 1. a foundation pit; 2. an underground diaphragm wall; 3. supporting steel; 4. steel plate strips; 5. hidden beams; 6. embedding the parts; 7. a stiffening plate; 8. a steel box girder; 9. a connecting layer; 10. cutting the unloading section; 11. steel pipe columns; 12. steel corbels; 13. a flange joint; 14. a pile foundation; 15. lining a wall; 16. supporting the first concrete; 17. a steel strip.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A permanently-temporary combined assembled inner support system is shown in figures 1 and 2 and comprises a foundation pit 1, wherein an underground continuous wall 2 is arranged on the inner wall of the foundation pit 1, a first concrete support 16 is fixed in the foundation pit 1 by the underground continuous wall 2, a plurality of steel supports 3 are horizontally arranged below the first concrete support 16 in the foundation pit 1, two ends of each steel support 3 are respectively connected with two sides of the underground continuous wall 2 to realize horizontal support for the foundation pit 1, the assembled inner support system which is permanently and temporarily combined is adopted below the first concrete support 16 in the underground continuous wall 2, a part of permanent structure which is finished in advance is arranged at the position, corresponding to the end part of each steel support, of the inner wall of the foundation pit 1, and a temporary structure is connected between the end part of each steel support 3 and the part of the permanent structure.
The steel support 3 is a steel pipe concrete pole which is processed and manufactured in a factory in advance, so that compared with a traditional support system, the on-site maintenance time is reduced, and the construction efficiency is greatly improved; in addition, the temporary structure is used for temporary connection, so through breaking off the temporary structure, the steel shotcrete 3 is convenient to pull down, adjusts, shifts and redistributes, improves the utilization degree of the steel shotcrete 3 resource, and for partial permanent structure, because the inner wall of the underground continuous wall 2 is required to be poured subsequently to form a complete interior lining wall 15, through pouring partial permanent structure completed in advance into the interior lining wall 15, the trouble that the temporary structure needs to be removed is effectively avoided, and the support removal work is prevented from occupying a key construction period.
As shown in fig. 2 and 3, part permanent structure is including setting up in the hidden roof beam 5 of 2 inner walls of underground continuous wall, pre-buried piece 6 that has buried in hidden roof beam 5, piece 6 is including the steel sheet that is fixed in hidden roof beam 5 tip buried, one side of steel sheet is fixed with a plurality of embedded steel bars, embedded steel bar is pre-buried to be set up in hidden roof beam 5, still pre-buried extension bar in hidden roof beam 5, the both ends of extension bar all extend hidden roof beam 5, be used for follow-up pre-buried setting in interior wall 15, one side level welded fastening that embedded steel bar was kept away from to the steel sheet has steel strip 4, be fixed with between steel strip 4 and the embedded piece 6 and be used for strengthening the stiffening plate 7 of steel strip.
The temporary structure comprises a steel box girder 8 fixed at the end part of the steel support 3, the steel box girder 8 is erected on the steel lath 4, a connecting layer 9 is filled between the steel box girder 8 and a part of the permanent structure, the connecting layer 9 is fine aggregate concrete or grouting material filled between the steel box girder 8 and the steel plate, when the temporary structure is used, the steel support 3 is erected on the steel lath 4 on the pair of hidden beams 5, assembly type construction is realized, and the construction efficiency is high; in addition, by breaking the connecting layer 9, the disassembly, turnover and redistribution of the steel support 3 can be realized.
The steel support 3 is provided with a cutting unloading section 10, the steel support 3 is arranged in the cutting unloading section 10 to be of a hollow structure, and a reinforcing plate is arranged in the cutting unloading section 10 and used for ensuring the bearing strength of the steel support 3 in the cutting unloading section 10. When the adjustable horizontal support is used, the widths of different positions in the foundation pit 1 are different, and the lengths of the steel supports 3 are adjusted by arranging the cutting unloading sections 10 with different lengths so as to adapt to horizontal supports with different lengths required by different positions in the foundation pit 1.
The bottom of foundation ditch 1 is provided with a plurality of pile foundations 14, and pre-buried many steel-pipe columns 11 that are connected with in the pile foundation 14, many steel-pipe columns 11 are vertical to be set up in foundation ditch 1, are fixed with the steel corbel 12 that is used for vertical support steel shotcrete 3 on the steel-pipe column 11.
A construction method of a permanent temporary combined assembled inner support system comprises the following steps:
s1, prefabricating a steel tube concrete tube, filling micro-expansion and self-compaction concrete in a plurality of sections of steel tubes, connecting by using a flange joint 13 to manufacture a steel support 3, and welding 8 sections of steel box girders at the end parts of supporting rods;
arranging a cutting unloading section at the non-standard section of the steel support 3, replacing filled concrete with a rib plate in a steel pipe of the section, facilitating later-stage removal, and changing the length of the steel support 3 to adapt to positions with different widths of the foundation pit 1;
s2, after the foundation pit 1 is excavated to the bottom of the support, firstly constructing the lining wall 15 corresponding to the support position by the template support, installing the embedded part 6 and the reinforcement cage, and pouring concrete to form the hidden beam 5;
s3, welding the steel plate strips 4 and the stiffening plates 7 to the embedded parts 6;
s4, hoisting the steel support 3 with the 8 sections of the steel box girder to a pair of steel laths 4;
s5, filling micro-expansion fine aggregate concrete or grouting material in a gap between the steel box girder 8 and the lining wall 15, and welding steel bars 17 on the steel plate above the steel box girder 8;
and S6, welding the 8 sections of the steel box girders end to end, and enclosing the 8 sections of the steel box girders on the inner wall of the lining wall 15 to form the steel concrete combined enclosing purlin of the steel box girder 8 superposed concrete hidden girder 5, so as to form the permanently-bound assembled inner support system.
In summary, the following steps:
the permanently-temporary combined assembly type inner support system is designed in the embodiment, wherein the main support rod pieces are supported by concrete-filled steel tubes prefabricated in a factory, the rigidity of the concrete-filled steel tubes is matched with that of the cast-in-place concrete supports, and the steel tube support system has a green and environment-friendly concept that the steel tube supports can be circulated;
the concrete-filled steel tube support is prefabricated in a factory, so that the field maintenance time is shortened;
in consideration of later dismantling of the steel pipe concrete support, a cutting unloading section is arranged at a non-standard section, and a rib plate is adopted in the steel pipe of the section to replace filled concrete;
adopt the combination of part permanent structure and temporary structure, construct in advance, use the 15 structures of part interior welt, reduce the quantity of steel box girder 8, greatly reduced the cost of construction, avoided demolising in later stage simultaneously. And through utilizing the reasonable replacement of establishing of the underground structure of building back to prop, adjust the strong point of foundation ditch 1 enclosure, realize the safe and orderly adjustment, transfer and the reallocation of enclosure stress, reach the control requirement that foundation ditch 1 warp in each stage.
Because the steel enclosing purlin section connected with the concrete-filled steel tube is constructed, the horizontal support does not influence the construction of a part of permanent structures, on one hand, the horizontal support can be dismantled without occupying a critical construction period, on the other hand, the horizontal support is dismantled postponed, and the construction safety of the foundation pit 1 is facilitated.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (7)

1. A permanent-temporary combined assembled inner support system comprises a foundation pit (1), and is characterized in that an underground continuous wall (2) is arranged on the inner wall of the foundation pit (1), and a plurality of steel supports (3) are horizontally arranged in the foundation pit (1);
the inner wall of the foundation pit (1) is provided with a partially permanent structure which is finished in advance at a position corresponding to the end part of the steel support (3), and a temporary structure is connected between the end part of the steel support (3) and the partially permanent structure.
2. A permanently bonded fabricated internal support system according to claim 1, wherein said partially permanent structure comprises steel strips (4) fixed to the inner wall of said underground continuous wall (2), and said temporary structure is erected on said steel strips (4).
3. A permanently bonded fabricated internal support system according to claim 2, characterized in that said partially permanent structure further comprises hidden beams (5) arranged on the inner wall of said underground continuous wall (2), said hidden beams (5) being provided with embedded parts (6), one side of said steel sheet strips (4) being fixed on said embedded parts (6).
4. A permanently bonded fabricated internal support system according to claim 3, characterized in that stiffening plates (7) for increasing the bearing strength of the steel strips (4) are fixed between the steel strips (4) and the embedded parts (6).
5. A permanently bonded fabricated internal support system according to claim 2, characterized in that the temporary structure comprises steel box girders (8) fixed to the ends of the steel supports (3), the steel box girders (8) are erected on the steel sheet bars (4), and a connection layer (9) is filled between the steel box girders (8) and the partially permanent structure.
6. A permanently bonded fabricated internal support system according to claim 1, wherein said steel struts (3) are steel tube concrete poles;
the steel support (3) is provided with a cutting unloading section (10), the steel support (3) is arranged in the cutting unloading section (10) to be of a hollow structure, and a rib plate for reinforcement is arranged in the cutting unloading section (10).
7. The permanently temporary combined fabricated inner support system according to claim 1, wherein a plurality of steel pipe columns (11) are vertically arranged in the foundation pit (1), and steel corbels (12) for vertically supporting the steel supports (3) are fixed on the steel pipe columns (11).
CN202021240305.7U 2020-06-30 2020-06-30 Support system in combination assembled forever Active CN212506301U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113605370A (en) * 2021-08-26 2021-11-05 广东省构建工程建设有限公司 Original underground diaphragm wall permanent-changing structure and construction process thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113605370A (en) * 2021-08-26 2021-11-05 广东省构建工程建设有限公司 Original underground diaphragm wall permanent-changing structure and construction process thereof

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