CN220580007U - Inclined strut supporting structure of steel lattice column of subway deep foundation pit - Google Patents
Inclined strut supporting structure of steel lattice column of subway deep foundation pit Download PDFInfo
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- CN220580007U CN220580007U CN202322075714.6U CN202322075714U CN220580007U CN 220580007 U CN220580007 U CN 220580007U CN 202322075714 U CN202322075714 U CN 202322075714U CN 220580007 U CN220580007 U CN 220580007U
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Abstract
The utility model relates to the technical field of building construction, in particular to a steel lattice column diagonal bracing supporting structure of a subway deep foundation pit, which comprises supporting piles and a steel lattice column foundation bearing platform, wherein crown beams are arranged at the upper ends of the supporting piles, a dewatering well is arranged on the inward side of the supporting piles, the steel lattice column foundation bearing platform is arranged on the inward side of the dewatering well, and meanwhile, the supporting piles and the steel lattice column foundation bearing platform are fixedly connected through a plurality of steel lattice diagonal braces. According to the supporting structure, the concrete strength does not need to be waited, and the next earth excavation can be directly carried out after the steel lattice diagonal bracing is installed, so that the construction period of the position can be effectively shortened, meanwhile, the number of positions of the supporting structure penetrating through a basement structure is reduced by taking the steel lattice diagonal bracing as a main support, and the leakage probability of the basement is further reduced.
Description
Technical Field
The utility model relates to the technical field of building construction, in particular to a diagonal bracing supporting structure of a steel lattice column of a deep foundation pit of a subway.
Background
The existing subway deep foundation pit supporting schemes are mostly concrete internal supporting schemes in foundation pits, and the defects that the process is complicated, the cost is high, the basement structure construction is influenced and the like exist. In order to effectively shorten the construction period, reduce the construction cost, reduce the influence of supporting structure to basement structure construction, and be convenient for later stage demolishs, solve the problem that noise, dust pollution and construction waste are handled because of reinforced concrete is broken and is brought in the later stage of supporting in the concrete. Therefore, a new deep foundation pit supporting scheme is needed to solve the problems of the traditional concrete internal supporting scheme.
The utility model of China with publication number of CN105113540A discloses a construction method for newly building a large deep foundation pit basement under a protective building, which combines a mature building translation technology with reverse construction method foundation pit construction in a limited base range on the premise of not dismantling the protective building, directly carries out integral construction of a basement of one and two areas after the protective building is in earthquake-resistant butt joint with a top plate of the basement of one area, reduces construction working conditions, steps and construction period of the basement on the basis of ensuring the stability of the protective building structure, improves the safety and stability of the protective building, increases the integral construction quality and efficiency, effectively controls the surrounding environment, reduces the middle separation belts of the first area and the second area, and maximizes time benefit, space benefit and stability benefit. However, the supporting structure of the construction method needs to pass through the basement structure, and hidden danger of basement leakage exists.
Disclosure of Invention
The utility model aims to provide a bracing support structure for a steel lattice column of a subway deep foundation pit, which aims to solve the problems in the background technology.
The technical scheme of the utility model is as follows: the utility model provides a face subway deep basal pit steel latticed post bracing supporting structure, including supporting pile and steel latticed post foundation pile cap, the upper end of supporting pile is provided with the crown beam, the supporting pile is inwards one side and is provided with the precipitation well, steel latticed post foundation pile cap sets up in the precipitation well inwards one side, simultaneously carry out fixed connection through a plurality of steel latticed bracing between supporting pile and the steel latticed post foundation pile cap.
Still further, one end of each steel lattice diagonal bracing is fixedly connected with one inward side of the supporting pile through an embedded part, the other end of each steel lattice diagonal bracing is fixed on the steel lattice column foundation pile cap through a steel structure column diagonal bracing pile cap, and the steel structure column diagonal bracing pile cap is arranged at the lower end of the steel lattice column foundation pile cap.
Furthermore, each steel lattice diagonal brace penetrates through the outer wall of the basement, and the outer wall of the basement is arranged between the dewatering well and the steel lattice column foundation bearing platform.
Furthermore, the upper end of each steel structure column diagonal bracing pile cap is fixedly provided with a steel lattice column, and each steel lattice column corresponding to the steel structure column diagonal bracing pile cap is arranged right below the steel lattice diagonal bracing corresponding to the previous steel structure column diagonal bracing pile cap.
Furthermore, one end of the steel lattice diagonal bracing, which is close to the steel lattice column foundation bearing platform, is provided with a water stop steel sheet.
And further, the steel lattice diagonal braces are sequentially arranged on the steel lattice column foundation bearing platform from left to right.
Still further, be provided with the bed course between the tip of steel check diagonal bracing and the steel lattice column foundation cushion cap, the bed course sets up the inside at steel lattice column foundation cushion cap, the upper end of bed course is provided with waterproof protection layer, the junction between waterproof protection layer and the steel check diagonal bracing tip is sealed through sealing paste.
Still further, the upper end of precipitation well is provided with waterproofing mechanism, waterproofing mechanism is including waterproof layer, concrete layer and sealing paste, concrete layer, waterproof layer and sealing paste set gradually from the bottom up.
The utility model provides a bracing support structure for a steel lattice column of a subway deep foundation pit through improvement, which has the following improvement and advantages compared with the prior art:
according to the supporting structure, the concrete strength does not need to be waited, and the next earth excavation can be directly carried out after the steel lattice diagonal bracing is installed, so that the construction period of the position can be effectively shortened, meanwhile, the number of positions of the supporting structure penetrating through a basement structure is reduced by taking the steel lattice diagonal bracing as a main support, and the leakage probability of the basement is further reduced.
Drawings
The utility model is further explained below with reference to the drawings and examples:
FIG. 1 is a cross-sectional view of a steel lattice column diagonal bracing structure of a subway deep foundation pit of the present utility model;
FIG. 2 is a schematic construction diagram of a support pile, curtain, dewatering well, steel structure column diagonal support pile cap and crown beam of the present utility model;
reference numerals illustrate:
1. supporting piles; 2. a crown beam; 3. a basement exterior wall; 4. steel lattice diagonal bracing; 5. steel lattice upright posts; 6. a water stop steel sheet; 7. a waterproof mechanism; 8. dewatering well; 9. supporting the pile cap by the steel structure column; 10. a steel lattice column base bearing platform; 11. and (5) embedding the parts.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, in the description of the present utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, it should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale, e.g., the thickness or width of some layers may be exaggerated relative to other layers for ease of description.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined or illustrated in one figure, no further detailed discussion or description thereof will be necessary in the following description of the figures.
Referring to fig. 1, the embodiment provides a diagonal bracing structure for a steel lattice column of a subway deep foundation pit, which comprises a supporting pile 1, a crown beam 2, a basement outer wall 3, a precipitation well 8 and a steel lattice column foundation bearing platform 10. Wherein the crown beam 2 is arranged at the upper end of the support pile 1, the dewatering well 8 is arranged at one side of the support pile 1 facing inwards, the steel lattice column foundation bearing platform 10 is arranged at one side of the dewatering well 8 facing inwards, and the basement outer wall 3 is arranged between the dewatering well 8 and the steel lattice column foundation bearing platform 10.
In this embodiment, the support piles 1 and the steel lattice column base table 10 are fixedly connected by a plurality of steel lattice diagonal braces 4. Notably, a plurality of steel lattice diagonal braces 4 are disposed in sequence on the steel lattice column base cap 10 from left to right. Specifically, one end of each steel lattice diagonal brace 4 is fixedly connected with one inward side of the supporting pile 1 through an embedded part 11, meanwhile, the other end of each steel lattice diagonal brace 4 is fixed on the steel lattice column foundation pile cap 10 through a steel structure column diagonal brace pile cap 9, and the steel structure column diagonal brace pile cap 9 is arranged at the lower end of the steel lattice column foundation pile cap 10. Notably, each steel lattice diagonal brace 4 extends through the basement exterior wall 3.
Further, the upper end of each steel structure column diagonal bracing pile cap 9 is fixed with a steel lattice column 5, and the steel lattice column 5 corresponding to each steel structure column diagonal bracing pile cap 9 is arranged right below the steel lattice diagonal bracing 4 corresponding to the previous steel structure column diagonal bracing pile cap 9. Wherein one end of the steel lattice diagonal bracing 4, which is close to the steel lattice column foundation bearing platform 10, is provided with a water stop steel sheet 6. Specifically, a cushion layer is arranged between the end part of the steel lattice diagonal bracing 4 and the steel lattice column foundation pile cap 10, the cushion layer is arranged inside the steel lattice column foundation pile cap 10, a waterproof protection layer is arranged at the upper end of the cushion layer, and the joint between the waterproof protection layer and the end part of the steel lattice diagonal bracing 4 is sealed through sealing paste.
In this embodiment, the upper end of dewatering well 8 is provided with waterproofing mechanism 7, and waterproofing mechanism 7 is including waterproof layer, concrete layer and sealing paste, and concrete layer, waterproof layer and sealing paste set gradually from the bottom up.
Specifically, the construction method of the inclined strut supporting structure of the steel lattice column of the subway deep foundation pit in the embodiment specifically comprises the following steps:
step S1: according to the surrounding environment conditions of a specific project, leveling the field and leaving the construction operation surface of the support piles 1, the curtains and the crown beams 2. In the embodiment, the support pile 1 adopts mechanical drilling to form holes, adopts a slurry wall protection drilling bored pile construction process, adopts a spacer pile construction, and carries out adjacent pile hole forming construction after concrete final setting. The curtain adopts a construction process that a row of high-pressure jet grouting piles are arranged between piles of the support piles 1, and the jet grouting piles adopt triple pipe injection pipes for jet grouting. It is noted that after the drilling machine is in place, perpendicularity correction is needed, and the drill rod is vertically aligned with the center position of the drilling hole. Before the crown beam 2 is constructed, pile top slurry, low-strength concrete and broken parts are removed. Meanwhile, the construction of the dewatering well 8 is strictly carried out according to the procedures of drilling holes, breaking the well walls, changing slurry, installing a water filtering pipe, throwing filter materials and flushing the well, and before the foundation pit formally dewatering, the water filtering and dewatering effects of the well should be checked by pumping water, wherein the sand content of the dewatering well 8 should be less than 1/20000. The steel structure column diagonal bracing pile 9 is constructed in a hollow piling mode, the depth of a hollow hole is about 15 meters, and the pile top design elevation of the steel structure column diagonal bracing pile 9 is required to be strictly controlled in the construction process so as to ensure the construction of the subsequent steel structure column diagonal bracing pile 9. Referring to fig. 2, fig. 2 is a schematic view of construction of a support pile, a curtain, a dewatering well, a steel structure column diagonal support pile cap pile and a crown beam in the present embodiment.
Step S2: a plurality of steel lattice diagonal braces 4 are sequentially arranged on the steel lattice column base bearing platform 10 from left to right. Wherein each steel lattice diagonal brace 4 needs to wait until the construction of the previous steel lattice diagonal brace 4 is completed, and then the construction is performed. In addition, except for the construction process of the first steel lattice diagonal brace 4, the construction process of each remaining steel lattice diagonal brace 4 is the same, and in this embodiment, the construction process of the first steel lattice diagonal brace 4 and the construction process of the second steel lattice diagonal brace 4 are taken as examples for specific explanation.
Step S2.1: the construction process of the first steel lattice diagonal bracing 4 specifically comprises the following steps:
step S2.1.1: and excavating the first layer of earthwork to the elevation of the lower side of the first concrete waist beam so that the first concrete waist beam can be conveniently constructed by taking soil as support to enter the reinforced concrete waist beam, and performing spraying construction of the support pile 1 according to the design requirement after the first layer of earthwork is excavated. The spraying protection of the first layer of support piles 1 avoids the position of the concrete waist beam so as to avoid influencing the combination between the concrete waist beam and the support piles 1, and the spraying protection construction of the first layer of support piles 1 can be performed after the construction of the concrete waist beam is completed.
Step S2.1.2: when the first layer of earthwork is excavated to the lower side of the concrete waist beam, the first concrete waist beam construction should be timely carried out, and the concrete waist beam construction should be strictly constructed according to the following procedures.
The first step: and positioning the concrete waist beam. The positioning and paying-off are carried out according to the designed position of the concrete waist beam, and it is worth noting that whether the position of the support pile 1 affects the position of the waist beam or not needs to be checked. When the position of the support pile 1 influences the waist beam position, the support pile 1 should be chiseled in the height range of the concrete waist beam, and the chiseling is performed until the reinforcement of the support pile 1, meanwhile, the reinforcement of the support pile cannot be disturbed, and the rest of the support piles 1 which do not influence the position of the concrete waist beam should be chiseled for 3-5cm in the height range of the concrete waist beam. It is worth noting that the concrete waist beam and the support pile 1 need to be chiseled into a plane to enlarge the contact area of the concrete waist beam and the support pile 1, so that the firm bonding between the concrete waist beam and the support pile 1 is ensured. When the position of the support pile 1 still affects the position of the concrete waist beam after chiseling, the position of the concrete waist beam can be adjusted according to actual conditions, and the adjusted position of the concrete waist beam should be rechecked with the border of the basement outer wall 3, wherein the concrete waist beam cannot affect the template installation of the basement outer wall 3 and the subsequent construction of waterproofing, backfilling and the like.
And a second step of: and (5) planting tendons on the waist beams. After the support pile 1 is chiseled, the AB component bar planting glue is adopted for bar planting, wherein the hole diameter of the bar planting hole, the depth of the bar planting hole and the construction process of the bar planting are strictly required according to design and related specifications, and the exposed length of the bar planting is required to meet the actual design requirement.
And a third step of: binding the waist beam steel bars. Before the waist beam steel bar binding, waste templates are fully paved on the ground of the lower side of the waist beam to serve as the lower side templates of the waist beam, so that the bottom concrete of the waist beam is smooth during the excavation of the lower side earthwork, and meanwhile, the waist beam steel bar binding is required according to design requirements. It is worth noting that the position of the waist beam steel bars should be rechecked before the waist beam steel bars are bound, so that the influence of the support piles 1 on the binding positions of the steel bars is avoided, and the construction condition that the deviation of the waist beam steel bars influences the basement outer wall 3 is caused. Meanwhile, after the waist beam is bound, an embedded part 11 is required to be installed on the inclined surface of the lower side of the concrete waist beam.
Fourth step: and (5) installing the waist beam template and pouring concrete. After the concrete waist beam steel bars are installed, the concrete waist beam template is required to be installed. Before the formwork is installed, the positions of the waist beam steel bars need to be rechecked again to ensure that the positions of the waist beam meet the follow-up construction of the basement outer wall 3.
Step S2.1.3: and the first steel lattice diagonal brace 4 is used for slope repairing. After the construction of the first concrete waist beam is completed, the slope of the first steel lattice diagonal bracing 4 is repaired, the slope is required to be excavated according to the actual design gradient, and meanwhile, the deformation observation of the foundation pit is required to be enhanced in the slope repairing process. After finishing the slope repair, measures such as color stripe cloth coverage and the like are adopted to protect slope soil, so that the slope is prevented from being washed by rain water, water and soil loss of the slope is avoided, and the supporting safety is influenced.
Step S2.1.4: the first steel lattice column foundation pile cap 10 is constructed. To avoid over-excavation of the earth, the first steel lattice column base cap 10 is only half of the entire steel lattice column base cap 10. It is worth noting that the pile foundation of the steel structure column diagonal bracing pile cap 9 should be detected before the steel lattice column foundation pile cap 10 is constructed, pile cap reinforcement can be carried out after the pile foundation is detected to be qualified, and the embedded part 11 is installed after the reinforcement is completed.
Step S2.2: and during the construction process of the second steel lattice diagonal bracing 4, after the welding of the first steel lattice diagonal bracing 4 is finished, when the strength of the first steel lattice column foundation bearing platform 10 and the strength of the concrete waist beam reach more than 80%, the second layer of earthwork excavation can be carried out, wherein the second layer of earthwork excavation reaches the elevation position of the bottom of the second concrete waist beam so as to facilitate the construction of the second concrete waist beam. In this embodiment, the construction process of the first steel lattice diagonal brace 4 and the construction process of the second steel lattice diagonal brace 4 are the same except that the first steel lattice upright 5 needs to be added. Specifically, the first steel lattice upright 5 is arranged right below the first steel lattice diagonal bracing 4 and is located right above the second steel structural column diagonal bracing pile 9.
Step S2.3: and the construction process of the rest other steel lattice diagonal braces 4 is the same as that of the second steel lattice diagonal brace 4, namely, when the strength of the second steel lattice column foundation bearing platform 10 and the concrete waist beam reach more than 80%, the rest earthwork excavation is carried out.
Step S3: and after the supporting construction of the steel lattice diagonal bracing 4 is completed, carrying out main structure construction. The steel grid upright 5 penetrates through the raft to be waterproof, and construction is performed according to the pile head waterproof method. That is, the steel lattice column 5 is filled with concrete, and the filling height is 15cm higher than that of the cushion layer, wherein the position higher than the cushion layer is constructed by referring to the pile head waterproof method. Meanwhile, the steel lattice diagonal bracing 4 penetrates through the basement outer wall 3, and a water stop steel sheet 6 is arranged at one end, close to the steel lattice column foundation bearing platform 10, of the steel lattice diagonal bracing 4. When the steel lattice diagonal braces 44 are removed, the holes at the positions where the steel lattice diagonal braces 4 penetrate through the basement outer wall 3 are required to be repaired.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a face subway deep basal pit steel latticed post bracing supporting structure, its characterized in that, including support stake (1) and steel latticed post foundation pile cap (10), the upper end of support stake (1) is provided with crown beam (2), support stake (1) one side inwards is provided with dewatering well (8), steel latticed post foundation pile cap (10) set up in dewatering well (8) one side inwards, simultaneously carry out fixed connection through a plurality of steel latticed bracing (4) between support stake (1) and steel latticed post foundation pile cap (10).
2. The steel lattice column diagonal bracing supporting structure for the subway deep foundation pit according to claim 1, wherein one end of each steel lattice diagonal bracing (4) is fixedly connected with one inward side of a supporting pile (1) through an embedded part (11), the other end of each steel lattice diagonal bracing (4) is fixed on a steel lattice column foundation pile cap (10) through a steel structural column diagonal bracing pile cap (9), and the steel structural column diagonal bracing pile cap (9) is arranged at the lower end of the steel lattice column foundation pile cap (10).
3. The steel lattice column diagonal bracing supporting structure for the subway deep foundation pit according to claim 1, wherein each steel lattice diagonal bracing (4) penetrates through a basement outer wall (3), and the basement outer wall (3) is arranged between a dewatering well (8) and a steel lattice column foundation bearing platform (10).
4. The steel lattice column diagonal bracing supporting structure for the subway deep foundation pit according to claim 2, wherein steel lattice columns (5) are fixed at the upper end of each steel structural column diagonal bracing pile cap (9), and the steel lattice columns (5) corresponding to each steel structural column diagonal bracing pile cap (9) are arranged right below the steel lattice diagonal bracing (4) corresponding to the previous steel structural column diagonal bracing pile cap (9).
5. The inclined strut supporting structure of the steel lattice column of the subway deep foundation pit, which is disclosed by claim 4, is characterized in that a water stop steel sheet (6) is arranged at one end of the steel lattice diagonal strut (4) close to a steel lattice column foundation bearing platform (10).
6. The steel lattice column diagonal bracing supporting structure for the subway deep foundation pit according to claim 5, wherein a plurality of steel lattice diagonal bracing (4) are sequentially arranged on a steel lattice column foundation bearing platform (10) from left to right.
7. The steel lattice column diagonal bracing supporting structure for the subway deep foundation pit according to claim 6, wherein a cushion layer is arranged between the end part of the steel lattice diagonal bracing (4) and the steel lattice column foundation bearing platform (10), the cushion layer is arranged inside the steel lattice column foundation bearing platform (10), a waterproof protection layer is arranged at the upper end of the cushion layer, and the junction between the waterproof protection layer and the end part of the steel lattice diagonal bracing (4) is sealed through sealing paste.
8. A steel lattice column diagonal bracing supporting structure for a subway deep foundation pit according to claim 1 or 3, wherein a waterproof mechanism (7) is arranged at the upper end of the dewatering well (8), the waterproof mechanism (7) comprises a waterproof layer, a concrete layer and sealing paste, and the concrete layer, the waterproof layer and the sealing paste are sequentially arranged from bottom to top.
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| CN202322075714.6U CN220580007U (en) | 2023-08-03 | 2023-08-03 | Inclined strut supporting structure of steel lattice column of subway deep foundation pit |
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| CN202322075714.6U CN220580007U (en) | 2023-08-03 | 2023-08-03 | Inclined strut supporting structure of steel lattice column of subway deep foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118855006A (en) * | 2024-07-29 | 2024-10-29 | 上海宝冶集团有限公司 | A method for monitoring internal forces of inclined supports of lattice columns in foundation pits |
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2023
- 2023-08-03 CN CN202322075714.6U patent/CN220580007U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118855006A (en) * | 2024-07-29 | 2024-10-29 | 上海宝冶集团有限公司 | A method for monitoring internal forces of inclined supports of lattice columns in foundation pits |
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