CN113897970A - Temporary steel support structure for deep foundation pit construction and construction method thereof - Google Patents
Temporary steel support structure for deep foundation pit construction and construction method thereof Download PDFInfo
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- CN113897970A CN113897970A CN202110244251.4A CN202110244251A CN113897970A CN 113897970 A CN113897970 A CN 113897970A CN 202110244251 A CN202110244251 A CN 202110244251A CN 113897970 A CN113897970 A CN 113897970A
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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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
A temporary steel support structure for deep foundation pit construction, comprising: the embedded parts are arranged on the wall body and the upright post near the post-cast strip; and two ends of the supporting rod are respectively connected with the embedded parts on the two adjacent upright posts and the wall body. The construction method of the temporary steel support structure comprises the following steps: s1: when a wall body and a stand column of a negative N layer of a basement (the basement has the negative N layer, N is more than or equal to 2) are constructed, an embedded part is arranged on the wall body and the stand column near a post-cast strip; s2: after the construction of the upright columns on the negative N layer of the basement, the wall body near the post-cast strip and the negative (N-1) layer plate surface is completed in the step S1, mounting support rods to form a temporary steel support structure, and then removing the support beams in the foundation pit above the level of the negative (N-1) layer plate surface; s3: repeating the step S1 and the step S2 to construct other layers of the basement; s4: the temporary steel support structure formed in step S2 may be removed when the post-cast strip is closed for a preset time. The method is suitable for the sectional dismantling and replacing of the reinforced concrete inner support of the ultra-long basement deep foundation pit, and further can ensure the sectional flow construction of the basement.
Description
Technical Field
The invention relates to the field of deep foundation pit construction, in particular to a temporary steel support structure for deep foundation pit construction and a construction method thereof, and more particularly relates to a temporary steel support structure for sectional replacement of a reinforced concrete inner support of a deep foundation pit and a construction method thereof.
Background
At present, in urban building dense areas, due to the influence of sites and geological conditions, a deep foundation pit generally adopts a supporting and protecting mode of fender posts and reinforced concrete inner supports. In the basement building, the arrangement of the post-cast strip of the structure enables the basement structure to be divided into different sections, and the arrangement of the post-cast strip leads to that the support can be detached and replaced after the construction of the structures on the same floor of the basement is completed, so that the flow construction operation can not be realized.
Disclosure of Invention
The invention mainly aims to provide a temporary steel support structure for deep foundation pit construction and a construction method thereof, and aims to solve the technical problems, so that the temporary steel support structure for supporting, sectionally dismantling and replacing supports in reinforced concrete is realized, the influence of a post-structure casting belt on dismantling and replacing the supports is avoided, and further the sectionally and sectionally constructing basement is realized.
A temporary steel support structure for deep foundation pit construction, comprising:
the embedded parts are arranged on the wall body and the upright post near the post-cast strip;
two ends of the supporting rod are respectively connected with embedded parts on two adjacent upright columns; or one end of the connecting rod is connected with the embedded part on the upright post, and the other end of the connecting rod is connected with the embedded part on the wall body; the support rods comprise horizontal support rods and inclined support rods.
Preferably, the embedment includes: the panel and set up perpendicularly a plurality of pre-buried poles on the panel surface keep away from on every pre-buried pole the one end of panel is provided with the embedding piece. When embedding the embedded part, the embedded rod and the embedded block are arranged inside the wall body and the upright column near the post-cast strip, and the panel is flush with the surface of the wall body and the surface of the upright column so as to be connected with the supporting rod.
Preferably, the embedded rod is connected with the panel in a perforation plug welding mode; the embedded rod is connected with the embedded block in a perforation plug welding mode. The through-hole plug welding mode is adopted for connection, the structure is simple, the welding quality is good, and the processing and the preparation of the embedded part are convenient.
Preferably, the support rod comprises an upper plate body, a lower plate body and a middle plate body arranged between the upper plate body and the lower plate body, and the cross section of the support rod is in an I shape. The upper plate body, the lower plate body and the middle plate body are all Q345B steel plates, the cross section of the components is in an I-shaped structure, the structure is simple, and the processing and the manufacturing are convenient.
Preferably, connecting plates for connecting with the embedded parts are respectively arranged at two ends of the middle plate body, and the connecting plates are fixedly connected with the middle plate body through bolts.
Preferably, the connecting plate and the embedded part are welded, a full penetration welding seam is adopted, and the grade of the welding seam is two-grade.
Preferably, when the embedded part is only connected with the horizontal supporting rod, 4 embedded rods are uniformly arranged on the panel and are uniformly distributed at four corners of the panel; when the embedded parts are only connected with the inclined supporting rods, 6 embedded rods are arranged on the panel, and the panel is divided into two rows and arranged on the panel; when the embedded parts are used for connecting the oblique supporting rods and the horizontal supporting rods which are mutually converged, 10 embedded rods are arranged on the panel, and the embedded rods are divided into two rows and arranged on the panel.
Preferably, the bracing piece both ends are preset to the oblique angle structure, when being used for carrying out the surperficial nonparallel that the bracing piece supported between two adjacent stands, perhaps stand surface and wall body surface nonparallel, through having preset the oblique angle at the bracing piece both ends for the terminal surface and the stand of bracing piece, wall body laminating guarantee the reliability of connecting.
A construction method of a temporary steel support structure constructed by adopting the deep foundation pit comprises the following steps:
s1: when a wall body and a stand column of a negative N layer of a basement (the basement has the negative N layer, N is more than or equal to 2) are constructed, an embedded part is arranged on the wall body and the stand column near a post-cast strip;
s2: after the construction of the upright columns on the negative N layer of the basement, the wall body near the post-cast strip and the negative (N-1) layer plate surface of the basement is finished in the step S1, mounting support rods, wherein the support rods comprise horizontal support rods and inclined support rods, and removing the support beams in the foundation pit above the level of the negative (N-1) layer plate surface after a temporary steel support structure is formed;
s3: repeating the step S1 and the step S2 to construct other layers of the basement;
s4: the temporary steel support structure formed in step S2 may be removed when the post-cast strip is closed for a preset time.
Preferably, the preset time in the step S4 is more than or equal to 28 days.
Preferably, in the step S1, when the embedded parts are used to connect the intersecting oblique supporting rods and the horizontal supporting rods, embedded nodes are provided on the columns or walls corresponding to the embedded parts to embed the embedded parts, and in the step S4, the temporary steel supporting structure is removed to cut the embedded nodes.
Compared with the prior art, the invention has at least the following beneficial effects: the temporary steel support structure is arranged near the post-structure pouring zone, so that the reinforced concrete inner support is not influenced by the post-structure pouring zone, and the support is detached and replaced in time, so that the relative independence of the reinforced concrete inner supports in each section and the relative independence of the basement structure in each section are realized, and then the support is detached and replaced in a sectional manner, and further the flow construction of the basement structure is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a top view of a temporary steel support structure according to the present invention;
FIG. 2 is a view from A-A, B-B, C-C, D-D of FIG. 1;
FIG. 3 is a top view of a schematic of the position of embedments in the temporary steel support structure of the present invention;
FIG. 4 is a view from the side of FIG. 3A-A, B-B, C-C, D-D, E-E, F-F and G-G;
FIG. 5 is a schematic view of a structure of an embedded part for connecting with a horizontal support rod;
FIG. 6 is a schematic structural view of an embedded part for connecting with an inclined supporting rod;
FIG. 7 is a schematic structural view of an embedded part for connecting intersecting oblique and horizontal support rods;
FIG. 8 is a schematic view of a support bar structure in the temporary steel support structure of the present invention;
FIG. 9 is a schematic view of a connection structure of an embedded part and an inclined support rod according to the present invention;
FIG. 10 is a schematic structural diagram of a pre-buried node according to the present invention;
FIG. 11 is a schematic structural diagram of an underground negative four-layer temporary support area in an embodiment of the invention;
FIG. 12 is a schematic structural diagram of an underground negative three-layer temporary support area in an embodiment of the invention;
FIG. 13 is a schematic structural diagram of a sub-surface negative two-layer temporary support area in an embodiment of the invention.
The reference numbers illustrate:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Referring first to fig. 1 and 2, fig. 1 is a top view of the temporary steel support structure of the present invention, and fig. 2 is a view from a-A, B-B, C-C, D-D of fig. 1. A temporary steel support structure for deep foundation pit construction, comprising:
the embedded parts 20 are arranged on the wall body 11 and the upright post 12 near the post-cast strip 10;
two ends of the supporting rod 30 are respectively connected with the embedded parts 20 on the two adjacent upright posts 12; or one end of the embedded part is connected with the embedded part 20 on the upright post 12, and the other end of the embedded part is connected with the embedded part 20 on the wall body 11; the support rods 30 include a horizontal support rod 31 and an inclined support rod 32.
As shown in fig. 5 to 7, in the present embodiment, the embedded part 20 includes: the panel 21 and set up perpendicularly a plurality of buried poles 22 on panel 21 a surface, be equipped with embedded piece 23 on the one end of keeping away from on every buried pole 22 panel 21. When the embedded parts 20 are embedded, the embedded rods 22 and the embedded blocks 23 are arranged inside the wall body 11 and the upright post 12 near the post-cast strip, and the panel 21 is flush with the surfaces of the wall body 11 and the upright post 12 so as to be connected with the supporting rods 30.
In this embodiment, the embedded rod 22 and the panel 21 are connected by a plug welding method; the embedded rod 22 and the embedded block 23 are connected in a perforation plug welding mode. The through-hole plug welding mode is adopted for connection, the structure is simple, the welding quality is good, and the processing and the preparation of the embedded part 20 are facilitated.
Further, in the present embodiment, when the embedded parts 20 are only connected to the horizontal support rods 31, 4 embedded rods 22 are uniformly arranged on the panel 21 at four corners of the panel 21; when the embedded parts 20 are only connected with the inclined supporting rods 32, 6 embedded rods 22 are arranged on the panel 21 and are arranged on the panel 21 in two rows; when the embedded parts 20 are used for connecting the intersecting oblique support rods 32 and the horizontal support rods 31, 10 embedded rods 22 are arranged on the panel 21, and the embedded rods 22 are arranged on the panel 21 in two rows.
Referring to fig. 8, fig. 8 is a schematic structural view of a support rod 30 in the temporary steel support structure according to the present invention. In this embodiment, the support rod 30 includes an upper plate 301, a lower plate 302, and a middle plate 303 disposed between the upper plate 301 and the lower plate 302, and the cross section of the support rod 30 is "i" shaped. The upper plate body 301, the lower plate body 302 and the middle plate body 303 are all Q345B steel plates, the cross section of the components is in an I-shaped structure, the structure is simple, and the processing and the manufacturing are convenient.
Further, in this embodiment, two ends of the middle plate 303 are respectively provided with a connecting plate 304 for connecting with the embedded part 20, and the connecting plate 304 and the middle plate 303 are fixedly connected by bolts.
In this embodiment, the connection plate 304 and the embedded part 20 are welded together by using a full penetration weld, and the grade of the weld is two.
In this embodiment, the two ends of the supporting rod 30 are preset to be bevel structures, and when the surfaces of the two adjacent columns 12 for supporting the supporting rod 30 are not parallel or the surfaces of the columns 12 and the wall 11 are not parallel, the bevel angles are preset at the two ends of the supporting rod 30, so that the end surfaces of the supporting rod 30 are attached to the columns 12 and the wall 11, and the connection reliability is ensured.
The embodiment of the invention also provides a construction method of the temporary steel support structure for deep foundation pit construction, which comprises the following steps:
s1: when constructing the wall body 11 and the upright post 12 of the negative N layer of the basement (the basement has the negative N layer, N is more than or equal to 2), arranging the embedded part 20 on the wall body 11 and the upright post 12 near the post-cast strip;
s2: after the construction of the upright 12 of the basement negative N layer, the wall 11 near the post-cast strip and the negative (N-1) layer plate surface of the basement is finished in the step S1, mounting the support rods 30, wherein the support rods 30 comprise horizontal support rods 31 and inclined support rods 32, and after a temporary steel support structure is formed, dismantling the support beams in the foundation pit above the level of the negative (N-1) layer plate surface;
s3: repeating the step S1 and the step S2 to construct other layers of the basement;
s4: the temporary steel support structure formed in step S2 may be removed when the post-cast strip is closed for a preset time.
Referring to fig. 2, 4, and 11 to 13, in this embodiment, the basement has negative four floors, and the specific construction steps are as follows:
s1: when constructing the wall 11 and the upright post 12 of the negative four layers of the basement, arranging embedded parts 20 on the wall 11 and the upright post 12 near the post-cast strip;
s2: after the construction of the upright 12 at the negative four-layer of the basement, the wall 11 near the post-cast strip and the slab surface at the negative three-layer is finished in the step S1, mounting the support rod 30, wherein the support rod 30 comprises a horizontal support rod 31 and an inclined support rod 32, and removing the support beam in the foundation pit above the elevation of the slab surface at the negative three-layer after forming the temporary steel support structure;
s3: repeating the step S1 and the step S2 to construct other floors above the basement;
s4: the temporary steel support structure formed in step S2 may be removed when the post-cast strip is closed for a preset time.
In the embodiment, the preset time in step S4 is equal to or more than 28 days.
In this embodiment, in the step S1, when the embedded parts 20 are used to connect the intersecting oblique supporting rods 32 and the horizontal supporting rods 31, the embedded nodes 40 are provided on the columns 12 or the walls 11 corresponding to the embedded parts 20 for embedding the embedded parts 20, and in the step S4, the temporary steel supporting structure is removed to cut the embedded nodes 40.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. The utility model provides a interim steel bearing structure of deep basal pit construction which characterized in that includes:
the embedded parts are arranged on the wall body and the upright post near the post-cast strip;
two ends of the supporting rod are respectively connected with embedded parts on two adjacent upright columns; or one end of the connecting rod is connected with the embedded part on the upright post, and the other end of the connecting rod is connected with the embedded part on the wall body; the support rods comprise horizontal support rods and inclined support rods.
2. A temporary steel support structure for deep foundation pit construction according to claim 1, wherein the embedment member includes: the panel and set up perpendicularly a plurality of pre-buried poles on the panel surface keep away from on every pre-buried pole the one end of panel is provided with the embedding piece.
3. A temporary steel support structure for deep foundation pit construction according to claim 2, wherein the embedded rod is connected with the panel by means of plug welding; the embedded rod is connected with the embedded block in a perforation plug welding mode.
4. A temporary steel support structure for deep foundation pit construction according to claim 1, wherein the support rod comprises an upper plate body, a lower plate body, and an intermediate plate body disposed between the upper plate body and the lower plate body, and the support rod has an i-shaped cross-section.
5. A temporary steel support structure for deep foundation pit construction according to claim 4, wherein connecting plates for connecting with the embedded parts are respectively provided at both ends of the middle plate body, and the connecting plates and the middle plate body are fixedly connected by bolts.
6. A temporary steel support structure for deep foundation pit construction according to claim 5, wherein the connection plate and the embedded part are welded by a full penetration weld, and the grade of the weld is two grade.
7. A temporary steel support structure for deep foundation pit construction according to claim 3,
when the embedded part is only connected with the horizontal supporting rod, 4 embedded rods are uniformly distributed on four corners of the panel;
when the embedded parts are only connected with the inclined supporting rods, 6 embedded rods are arranged on the panel, and the panel is divided into two rows and arranged on the panel;
when the embedded parts are used for connecting the oblique supporting rods and the horizontal supporting rods which are mutually converged, 10 embedded rods are arranged on the panel, and the embedded rods are divided into two rows and arranged on the panel.
8. A temporary steel support structure for deep foundation pit construction according to claim 1, wherein both ends of the support rod are preset to an oblique angle structure.
9. A construction method of a temporary steel support structure for deep foundation pit construction according to any one of claims 1 to 8, comprising the steps of:
s1: when a wall body and a stand column of a negative N layer of a basement (the basement has the negative N layer, N is more than or equal to 2) are constructed, an embedded part is arranged on the wall body and the stand column near a post-cast strip;
s2: after the construction of the upright columns on the negative N layer of the basement, the wall body near the post-cast strip and the negative (N-1) layer plate surface of the basement is finished in the step S1, mounting support rods, wherein the support rods comprise horizontal support rods and inclined support rods, and removing the support beams in the foundation pit above the level of the negative (N-1) layer plate surface after a temporary steel support structure is formed;
s3: repeating the step S1 and the step S2 to construct other layers of the basement;
s4: the temporary steel support structure formed in step S2 may be removed when the post-cast strip is closed for a preset time.
10. The construction method according to claim 9, wherein the preset time in the step S4 is 28 days or more.
11. The construction method according to claim 9, wherein in step S1, when the embedded parts are used to connect the crossing diagonal support bars and the horizontal support bars, embedded nodes are provided on the columns or walls corresponding to the embedded parts for embedding the embedded parts, and in step S4, the temporary steel support structure is removed to cut the embedded nodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110244251.4A CN113897970A (en) | 2021-03-05 | 2021-03-05 | Temporary steel support structure for deep foundation pit construction and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110244251.4A CN113897970A (en) | 2021-03-05 | 2021-03-05 | Temporary steel support structure for deep foundation pit construction and construction method thereof |
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| CN113897970A true CN113897970A (en) | 2022-01-07 |
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| CN202110244251.4A Pending CN113897970A (en) | 2021-03-05 | 2021-03-05 | Temporary steel support structure for deep foundation pit construction and construction method thereof |
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| CN109056737A (en) * | 2018-06-22 | 2018-12-21 | 中建五局华东建设有限公司 | Deep basal pit outer wall of basement integrates the construction method of one side formwork support system |
| CN109555129A (en) * | 2018-12-24 | 2019-04-02 | 上海建工二建集团有限公司 | One kind is quickly met an urgent need diagonal brace and construction method for salvage of foundation pits |
| CN111305221A (en) * | 2019-12-09 | 2020-06-19 | 中建四局土木工程有限公司 | Method for replacing inner support of foundation pit |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004308328A (en) * | 2003-04-09 | 2004-11-04 | Nippon Steel Corp | Revetment structure |
| CN201546227U (en) * | 2009-10-31 | 2010-08-11 | 华丰建设股份有限公司 | Steel support beam for supporting foundation pit bracing piling wall and basement structure outer wall |
| CN102720201A (en) * | 2012-07-02 | 2012-10-10 | 中建三局第二建设工程有限责任公司 | Support change construction building method implemented by using main structure of building |
| CN102747736A (en) * | 2012-07-12 | 2012-10-24 | 中建一局集团第三建筑有限公司 | Combination tool type inner bracing changing method |
| CN205839767U (en) * | 2016-07-27 | 2016-12-28 | 中船勘察设计研究院有限公司 | A kind of deep foundation pit steel tube/concrete is combined inner supporting structure |
| CN106499199A (en) * | 2016-12-14 | 2017-03-15 | 上海建工二建集团有限公司 | Close on the interim support replacement of subway ultra-deep foundation pit mid-board and its construction method |
| CN107227842A (en) * | 2017-06-16 | 2017-10-03 | 华润建筑有限公司 | Post-cast strip adjustable steel support system and application method |
| CN109056737A (en) * | 2018-06-22 | 2018-12-21 | 中建五局华东建设有限公司 | Deep basal pit outer wall of basement integrates the construction method of one side formwork support system |
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| CN111305221A (en) * | 2019-12-09 | 2020-06-19 | 中建四局土木工程有限公司 | Method for replacing inner support of foundation pit |
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Application publication date: 20220107 |