CN111472348B - Profile steel and concrete combined underground continuous wall structure and construction method thereof - Google Patents
Profile steel and concrete combined underground continuous wall structure and construction method thereof Download PDFInfo
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- CN111472348B CN111472348B CN202010326736.3A CN202010326736A CN111472348B CN 111472348 B CN111472348 B CN 111472348B CN 202010326736 A CN202010326736 A CN 202010326736A CN 111472348 B CN111472348 B CN 111472348B
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- continuous wall
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a profile steel and concrete combined underground continuous wall structure and a construction method thereof. The basement construction method based on the combined underground continuous wall comprises the following steps: putting the precast concrete underground diaphragm wall on site, inserting the section steel in the reserved hole, grouting and filling the gap, constructing the basement, and removing and recycling the section steel and grouting and filling after the construction of the basement is finished. The underground continuous wall adopts a prefabricated mode, profile steel is inserted into a reserved cavity of the underground continuous wall after the underground continuous wall is placed in place, the profile steel is recovered after the construction of a basement structure is completed, concrete is subjected to partial grouting treatment and then continues to be used together with the outer wall of the basement or is used as the outer wall of the basement as a permanent structure, no rigid barrier exists below the basement after the profile steel is recovered, resources are saved, and conditions are reserved for the subsequent development of deep underground spaces.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a low-cost section steel and concrete combined underground continuous wall structure capable of recycling section steel and meeting the requirements of overall stability, pit bottom bulging and overturning resistance of a foundation pit and a construction method thereof.
Background
When the underground continuous wall is designed, in order to meet the requirements of integral stability, pit bottom uplift and anti-overturning of a foundation pit, the conventional method is that the underground continuous wall is deeply arranged below a basement bottom plate for a certain depth, after the construction of an underground structure is finished, the underground continuous wall below the basement bottom plate is directly left underground, and the extended part loses the original use function, so that certain waste is caused; in addition, the part below the bottom plate is generally regarded as an obstacle and is permanently buried below the basement, which affects the development of the subsequent deep underground space.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a low-cost section steel and concrete combined underground continuous wall structure capable of meeting the requirements of overall stability, pit bottom uplift and anti-overturning of a foundation pit and capable of recycling section steel and a construction method thereof.
The profile steel and concrete combined underground continuous wall structure is characterized by comprising a prefabricated underground continuous wall body and profile steel, wherein a group of parallel reserved holes are formed in the prefabricated underground continuous wall body at intervals, the shape and the size of each reserved hole are matched with those of the profile steel, the profile steel is inserted into the reserved holes, and grouting and filling are performed on the space between the profile steel and the reserved holes to obtain a grouting solidification guard ring; the length of shaped steel is greater than the height of prefabricated formula underground continuous wall body, and the shaped steel lower extreme extends from bottom surface under the prefabricated formula underground continuous wall body, and during the construction, the shaped steel lower extreme extends to in the soil body of prefabricated formula underground continuous wall body below.
The profile steel and concrete combined underground continuous wall structure is characterized in that the distance between two adjacent reserved holes is 0.5-2.0 m.
The profile steel and concrete combined underground continuous wall structure is characterized in that the depth of the lower end of the profile steel extending downwards from the bottom surface of the prefabricated underground continuous wall body is 0.2H-2.5H, and H is the depth of a foundation pit.
The basement construction method of the combined underground continuous wall structure is characterized by comprising the steps of prefabricating an underground continuous wall with reserved holes in a factory, putting the prefabricated underground continuous wall on site, inserting section steel into the reserved holes of the underground continuous wall, grouting and filling gaps between the section steel and the underground continuous wall, constructing the basement, removing and recovering the section steel after the basement construction is finished, and grouting and filling concrete holes after the section steel is removed.
The basement construction method based on the combined underground continuous wall structure is characterized by comprising the following steps:
1) prefabricating the underground continuous wall with the reserved holes from a factory according to design requirements to obtain a prefabricated underground continuous wall body, wherein the reserved holes are arranged at intervals along the length direction of the prefabricated underground continuous wall body, and the size of the reserved holes is matched with the profile steel to obtain the prefabricated underground continuous wall with the reserved holes for later use;
2) transporting the prefabricated underground continuous wall with the reserved holes and a corresponding amount of profile steel to a construction site, lowering the prefabricated underground continuous wall with the reserved holes into a pre-dug groove, inserting the profile steel into each reserved hole, and enabling the profile steel to penetrate out of the bottom of the underground continuous wall and extend downwards to a certain depth;
3) grouting and filling a gap between the section steel and the reserved hole, and obtaining a grouting solidification guard ring after grouting and solidification;
4) performing basement construction according to the conventional method;
5) removing and recycling the profile steel after the basement construction is finished, and presenting concrete holes matched with the profile steel structure in the reserved holes of the prefabricated underground continuous wall body (1);
6) and (5) grouting and filling the concrete hole after the section steel is pulled out, and obtaining a grouting solidification column after grouting solidification to finish the construction of the basement.
The basement construction method of the combined underground continuous wall structure is characterized in that the interval length of the reserved holes in the step 1) is 0.5-2.0 m.
The basement construction method of the combined underground continuous wall structure is characterized in that the depth of downward extension of the section steel in the step 2) is 0.2H-2.5H, and H is the depth of a foundation pit.
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
1) by adopting the combined underground continuous wall structure with the limited structure, because the length of the section steel is greater than the height of the underground continuous wall with the reserved holes, the bottom of the section steel extends downwards, during construction, the bottom of the section steel extends to a corresponding depth below a basement bottom plate, the section steel replaces an extension section of an underground continuous wall adopted in common construction, on one hand, the use of concrete is reduced, the cost is reduced, the construction period is shortened, and the working efficiency is improved, on the other hand, after the basement construction is finished, the internal section steel is taken out and recycled, so that the cost is further limited, the concrete part is continuously used together with the basement outer wall or used as the basement outer wall as a permanent structure after grouting treatment, no rigid barrier exists below the basement after the section steel is recycled, resources are saved, and conditions are reserved for subsequent deep underground space development;
2) the prefabricated combined underground continuous wall with the limited structure is used for assisting basement construction, namely fixing the underground continuous wall during basement construction, effectively avoids the extension of the underground continuous wall in conventional construction, wastes are caused in the later period of the extended underground continuous wall, and after construction is finished, section steel is pulled out, grouting is performed for filling, and development of deep underground space is facilitated.
Drawings
Fig. 1 is a schematic structural view of a combined underground diaphragm wall of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is a schematic structural view of a prefabricated underground diaphragm wall body according to the present invention;
FIG. 4 is a schematic structural view illustrating the combination of the prefabricated underground diaphragm wall and the section steel in step 2) of the present invention;
FIG. 5 is a schematic structural diagram of the invention after construction in step 5);
FIG. 6 is an enlarged view of the structure at B in FIG. 5;
FIG. 7 is a schematic structural diagram of the invention after construction in step 6);
fig. 8 is an enlarged schematic view of the structure at C in fig. 7.
In the figure: the method comprises the following steps of 1-prefabricating an underground diaphragm wall body, 2-reserving holes, 3-section steel, 4-grouting solidification guard rings, 5-concrete holes and 6-grouting solidification columns.
Detailed Description
The invention is further described with reference to the accompanying drawings, but the scope of the invention is not limited thereto:
the invention avoids the waste of the extension underground continuous wall in the background technology, is beneficial to the development of deep underground space, and particularly discloses a section steel and concrete combined underground continuous wall capable of recycling section steel. As shown in fig. 1-2, the profile steel and concrete combined underground continuous wall structure defined by the invention comprises a prefabricated underground continuous wall body 1 and profile steel 3, wherein a group of parallel reserved holes 2 are arranged in the prefabricated underground continuous wall body 1 at intervals, the shape and the size of each reserved hole 2 are matched with those of the profile steel 3, the profile steel 3 is inserted into the reserved holes 2, and the space between the profile steel 3 and the reserved holes 2 is filled by grouting to obtain a grouting solidification guard ring 4; the length of shaped steel 3 is greater than the height of prefabricated formula underground continuous wall body 1, and 3 lower extremes of shaped steel extend from prefabricated formula underground continuous wall body 1 bottom surface down, and during the construction, 3 lower extremes of shaped steel extend to in the soil body of prefabricated formula underground continuous wall body 1 below.
As shown in fig. 1-2, it can be seen from the cross sectional views that the section steels in the combined underground continuous wall are distributed in the underground continuous wall at certain intervals, and the size of the section steels and the size of the interval are determined according to the calculation of the lateral soil pressure of the foundation pit and the deformation control requirement. The sectional view of the foundation pit shows that the section steel concrete combined underground continuous wall is arranged above the elevation of the pit bottom, and the section steel continuously extends downwards to increase the stability of the section steel concrete combined underground continuous wall; during construction, the bottom of the section steel extends to a corresponding depth below a basement bottom plate, the section steel replaces an underground continuous wall extension section adopted in common construction, on one hand, the use of concrete is reduced, the cost is reduced, the construction period is shortened, and the working efficiency is improved.
As shown in fig. 1-8, the basement construction method of the section steel and concrete combined underground continuous wall based on the recyclable section steel of the invention comprises the steps of prefabricating the underground continuous wall with reserved holes in a factory, putting down the prefabricated underground continuous wall on site, inserting the section steel into the reserved holes of the underground continuous wall, grouting and filling gaps between the section steel and the underground continuous wall, constructing the basement, removing the recyclable section steel after the basement construction is finished, and grouting and filling concrete holes after the section steel is removed, and specifically comprises the following steps:
1) according to design requirements, prefabricating an underground continuous wall with reserved holes in a factory, wherein the reserved holes are arranged at intervals along the length direction of the underground continuous wall, the size of each reserved hole is matched with the profile steel, and the prefabricated underground continuous wall with the reserved holes is obtained for later use;
2) the prefabricated underground continuous wall with reserved holes in the step 1) and a corresponding amount of profile steel are transported to a construction site, firstly, grooves are dug, the prefabricated underground continuous wall with reserved holes is placed into the pre-dug grooves, the profile steel is inserted into each reserved hole, the profile steel penetrates out of the bottom of the underground continuous wall and extends downwards to a certain depth, the structure of the prefabricated underground continuous wall is shown in figure 4, the downwards extending depth can be calculated according to the stability requirement of national or local foundation pit specifications, the preferred depth of the prefabricated underground continuous wall is 0.2H-2.5H, and H is the depth of a foundation pit;
3) grouting and filling a gap between the section steel and the reserved hole, wherein the grouting mode and the used grout are conventional technologies, and are not described again, and the structure obtained in the step is shown in fig. 1 and fig. 2;
4) after grouting solidification, namely excavating a basement, namely a foundation pit after the construction of the continuous wall is finished, and performing basement construction;
5) removing the section steel and recovering after the basement construction is finished, wherein the structure after the section steel is removed is shown in figures 5 and 6;
6) grouting and filling the concrete hole with the removed section steel to finish the construction of the underground continuous wall, wherein the structure is shown in figures 7 and 8; the underground diaphragm wall obtained by the process comprises an underground diaphragm wall body 1, a group of parallel reserved holes 2 are arranged in the underground diaphragm wall body 1 at intervals, a grouting ring 3 and a grouting core 4 are arranged in each reserved hole 2 from outside to inside, profile steel is inserted into each reserved hole 2 during underground structure construction, an annular gap between the profile steel and each reserved hole 2 is filled with grouting to obtain the grouting ring 3, after the underground structure construction is finished, a profile steel hole left by the profile steel is pulled out for grouting and filling to obtain the grouting core 4, the bottom of the grouting core 4 extends to the position below the bottom of the underground diaphragm wall, the preferred extension depth is 0.2H-2.5H below the underground diaphragm wall, and H is the depth of a foundation pit.
By adopting the technology, the underground continuous wall with the reserved cavity and the section steel are both in a prefabricated form, the section steel is inserted into the reserved cavity after the underground continuous wall is placed in place, finally, after the construction of the basement structure is completed, the section steel is recovered, the concrete part is subjected to grouting treatment and then is continuously used together with the basement outer wall or used as the basement outer wall as a permanent structure, no rigid barrier exists below the basement after the section steel is recovered, resources are saved, and conditions are reserved for the subsequent development of deep underground space.
Claims (4)
1. A profile steel and concrete combined underground continuous wall structure is characterized by comprising a prefabricated underground continuous wall body (1) and profile steel (3), wherein a group of parallel reserved holes (2) are formed in the prefabricated underground continuous wall body (1) at intervals, the shape and the size of each reserved hole (2) are matched with those of the profile steel (3), the profile steel (3) is inserted into the reserved holes (2), and the space between the profile steel (3) and the reserved holes (2) is filled with grouting to obtain a grouting solidification guard ring (4); the length of the section steel (3) is greater than the height of the prefabricated underground continuous wall body (1), the lower end of the section steel (3) extends out of the lower bottom surface of the prefabricated underground continuous wall body (1), and during construction, the lower end of the section steel (3) extends into a soil body below the prefabricated underground continuous wall body (1); the distance between two adjacent reserved holes (2) is 0.5-2.0 m; the depth of the lower end of the section steel (3) extending downwards from the bottom surface of the prefabricated underground continuous wall body (1) is 0.2H-2.5H, and H is the depth of a foundation pit.
2. The basement construction method based on the combined underground continuous wall structure of claim 1, comprising the steps of prefabricating the underground continuous wall with reserved holes in a factory, lowering the prefabricated underground continuous wall on site, inserting section steel into the reserved holes of the underground continuous wall, grouting and filling gaps between the section steel and the underground continuous wall, constructing the basement, removing and recovering the section steel after the basement construction is finished, and grouting and filling concrete holes after the section steel is removed, and the basement construction method is characterized by comprising the following steps:
1) prefabricating the underground continuous wall with the reserved holes (2) from a factory according to design requirements to obtain a prefabricated underground continuous wall body (1), wherein the reserved holes (2) are arranged at intervals along the length direction of the prefabricated underground continuous wall body (1), and the size of the reserved holes (2) is matched with that of the section steel (3) to obtain the prefabricated underground continuous wall with the reserved holes for later use;
2) the prefabricated underground continuous wall with the reserved holes in the step 1) and a corresponding number of section steels (3) are transported to a construction site, the prefabricated underground continuous wall with the reserved holes is placed into a pre-dug groove, the section steels (3) are inserted into each reserved hole (2), and the section steels (3) penetrate out of the bottom of the underground continuous wall and extend downwards to a certain depth;
3) grouting and filling the gap between the section steel (3) and the reserved hole (2), and obtaining a grouting solidification guard ring (4) after grouting and solidification;
4) performing basement construction according to the conventional method;
5) after the basement construction is finished, the section steel (3) is pulled out and recovered, and a concrete hole (5) matched with the structure of the section steel (3) is formed in a reserved hole (2) of the prefabricated underground continuous wall body (1);
6) and (4) grouting and filling the concrete hole after the section steel (3) is pulled out, and obtaining a grouting solidification column (6) after grouting solidification to finish the construction of the basement.
3. The basement construction method of a combined underground continuous wall structure according to claim 2, wherein the interval length of the reserved holes in step 1) is 0.5m to 2.0 m.
4. The basement construction method of a combined underground continuous wall structure according to claim 2, wherein the depth of the downward extension of the section steel in the step 2) is 0.2H to 2.5H, and H is the depth of the foundation pit.
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| CN202010326736.3A CN111472348B (en) | 2020-04-23 | 2020-04-23 | Profile steel and concrete combined underground continuous wall structure and construction method thereof |
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| CN202010326736.3A CN111472348B (en) | 2020-04-23 | 2020-04-23 | Profile steel and concrete combined underground continuous wall structure and construction method thereof |
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| CN111472348B true CN111472348B (en) | 2021-10-15 |
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| CN1776112A (en) * | 2005-11-30 | 2006-05-24 | 王平 | High-performance cement soil continuous wall construction method |
| JP2010222944A (en) * | 2009-03-25 | 2010-10-07 | Tenox Corp | Wall member for continuous underground wall, construction method for continuous underground wall, and continuous underground wall |
| CN103758134A (en) * | 2014-01-24 | 2014-04-30 | 中国建筑股份有限公司 | Combined double-row pile supporting system and construction method thereof |
| CN109083128A (en) * | 2018-09-10 | 2018-12-25 | 浙江吉通地空建筑科技有限公司 | Fashioned iron column assembled underground continuous wall with high-bearing capacity |
| CN109518696A (en) * | 2018-11-02 | 2019-03-26 | 东通岩土科技股份有限公司 | Assembled manomelia diaphram wall |
| CN110258526A (en) * | 2019-05-28 | 2019-09-20 | 广州穗岩土木科技股份有限公司 | The method of prefabricated diaphram wall and construct outer wall of basement and floor |
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2020
- 2020-04-23 CN CN202010326736.3A patent/CN111472348B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1776112A (en) * | 2005-11-30 | 2006-05-24 | 王平 | High-performance cement soil continuous wall construction method |
| JP2010222944A (en) * | 2009-03-25 | 2010-10-07 | Tenox Corp | Wall member for continuous underground wall, construction method for continuous underground wall, and continuous underground wall |
| CN103758134A (en) * | 2014-01-24 | 2014-04-30 | 中国建筑股份有限公司 | Combined double-row pile supporting system and construction method thereof |
| CN109083128A (en) * | 2018-09-10 | 2018-12-25 | 浙江吉通地空建筑科技有限公司 | Fashioned iron column assembled underground continuous wall with high-bearing capacity |
| CN109518696A (en) * | 2018-11-02 | 2019-03-26 | 东通岩土科技股份有限公司 | Assembled manomelia diaphram wall |
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