CN112609706B - Construction method of opposite-bracing angle brace concrete horizontal supporting structure of foundation pit in sea reclamation area - Google Patents
Construction method of opposite-bracing angle brace concrete horizontal supporting structure of foundation pit in sea reclamation area Download PDFInfo
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- CN112609706B CN112609706B CN202011432296.6A CN202011432296A CN112609706B CN 112609706 B CN112609706 B CN 112609706B CN 202011432296 A CN202011432296 A CN 202011432296A CN 112609706 B CN112609706 B CN 112609706B
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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Abstract
The invention discloses a construction method of a horizontal supporting structure of foundation pit bracing angle brace concrete in a sea reclamation area, which comprises the following steps: dividing the foundation pit into at least two horizontal layers along the vertical direction, wherein any horizontal layer comprises an angle support area and a counter support area; completing pile driving construction on the surface layer of the whole foundation pit; excavating earth on the surface layer of the whole foundation pit to a first horizontal layer, and taking the first horizontal layer as a current construction horizontal layer; pouring a corner brace in a corner brace area of the current construction horizontal layer; continuously excavating the opposite support area of the current construction horizontal layer and reserving soil for slope placement to the next horizontal layer; continuously excavating the corner brace area of the current construction horizontal layer to the next horizontal layer, pouring the corner brace of the next horizontal layer, pouring the counter brace of the current construction horizontal layer, and taking the next horizontal layer as the current construction horizontal layer; and repeating the first two steps until the corner support and the butt support of the bottommost horizontal layer are finished. The construction method can improve the excavation efficiency of the foundation pit earthwork, thereby improving the engineering construction efficiency.
Description
Technical Field
The invention relates to the field of foundation pit supporting construction methods, in particular to a construction method of a sea reclamation area foundation pit diagonal bracing angle brace concrete horizontal supporting structure.
Background
In the foundation pit engineering, the support system plays an extremely important role in the stability of the foundation pit, the construction period and the construction cost. In the construction process of the foundation pit in the sea reclamation area, the dense diagonal bracing angle brace concrete horizontal supporting structure is required to be used for supporting the side wall of the foundation pit due to the complex geological condition of the sea reclamation area. In the traditional construction method, a layer of supporting structure is poured for excavating a layer of earthwork, but when the construction site where the foundation pit is located is narrow and the slope cannot be set in the foundation pit, the dense diagonal bracing and angle brace concrete supporting structure occupies space, so that the excavator is difficult to enter the foundation pit for excavation, and the technical problem of low earthwork excavation efficiency exists.
Disclosure of Invention
The invention mainly aims to provide a construction method of a butt-bracing angle brace concrete horizontal supporting structure of a foundation pit in a sea-filling area, and aims to solve the technical problem that the earthwork excavation efficiency of a traditional construction method in a narrow construction place in the sea-filling area in the prior art is low.
In order to achieve the purpose, the construction method of the opposite-bracing angle brace concrete horizontal supporting structure of the foundation pit in the sea reclamation area, which is provided by the invention, comprises the following steps:
dividing the foundation pit into at least two horizontal layers along the vertical direction, wherein any horizontal layer comprises an angle support area and a counter support area;
the construction of precast concrete tubular piles, triaxial mixing piles, concrete pouring support piles, support pile crown beams and corner brace area upright piles is finished on the surface layer of the whole foundation pit;
excavating earth on the surface layer of the whole foundation pit to a first horizontal layer, and taking the first horizontal layer as a current construction horizontal layer;
pouring a corner brace in a corner brace area of the current construction horizontal layer;
continuously excavating the opposite support area of the current construction horizontal layer and reserving soil for slope placement to the next horizontal layer;
continuously excavating the corner brace area of the current construction horizontal layer to the next horizontal layer, pouring the corner brace of the next horizontal layer, pouring the counter brace of the current construction horizontal layer, and then taking the next horizontal layer as the current construction horizontal layer;
and repeatedly executing the steps of continuously excavating the diagonal bracing region of the current construction horizontal layer and reserving soil for slope placement to the next horizontal layer, continuously excavating the diagonal bracing region of the current construction horizontal layer to the next horizontal layer and pouring the diagonal bracing of the next horizontal layer, pouring the diagonal bracing of the current construction horizontal layer, and then taking the next horizontal layer as the current construction horizontal layer until the diagonal bracing and the diagonal bracing of the bottommost horizontal layer are finished.
Optionally, before the step of continuously excavating the corner brace area of the current construction horizontal layer to the next horizontal layer and pouring the corner brace of the next horizontal layer, the construction method further includes:
and constructing the slope-releasing protection surface.
Optionally, the step of reinforcing the slope includes:
finishing the slope surface of the slope;
inserting a plurality of steel bars into the slope surface, wherein the steel bars protrude out of the slope surface by a preset length;
spraying concrete on the slope surface according to the preset length of the reinforcing steel bars to form a first layer of protective surface;
after the first layer of protective surface is finally set, laying a steel bar net sheet on the surface of the first layer of protective surface, and arranging a slope surface drainage system;
and spraying concrete on the surface of the first layer of protective surface to form a second layer of protective surface, and spraying water to the second layer of protective surface for maintenance after the second layer of protective surface is finally set, so that the protective surface construction is completed.
Optionally, after the step of completing the corner brace and the counter brace of the bottommost horizontal layer, the construction method further includes:
pouring a construction foundation bottom plate on the base below the bottommost horizontal layer;
and sequentially pouring a construction foundation bottom plate for each horizontal layer in the at least two horizontal layers along the vertical upward direction, and removing the corner brace and the butt brace of each horizontal layer to complete the whole underground structure.
Optionally, the construction method further includes, after the step of sequentially pouring a construction foundation slab for each horizontal layer in the at least two horizontal layers and removing the corner brace and the counter brace of each horizontal layer along the vertical upward direction, and completing the whole underground structure:
and backfilling the side wall of the foundation pit.
Optionally, before the steps of constructing the precast concrete tubular pile, the triaxial mixing pile, the concrete pouring support pile, the support pile crown beam and the corner brace area upright pile on the surface layer of the full foundation pit, the construction method further comprises the following steps:
and arranging a plurality of settlement monitoring points and recharging wells around the foundation pit at the ground surface foundation pit.
Optionally, the step of continuously excavating the corner brace region of the current construction horizontal layer to the next horizontal layer and pouring the corner brace of the next horizontal layer includes:
and according to the design depth of the horizontal layer, continuously excavating the corner brace region of the current construction horizontal layer from the first preset depth to the next horizontal layer and pouring the corner brace of the next horizontal layer.
Optionally, the step of continuously excavating the opposite supporting area of the current construction horizontal layer and reserving soil for slope placement to the next horizontal layer comprises:
continuously excavating the opposite support area of the current construction horizontal layer to a second preset depth and reserving soil for slope putting to the next horizontal layer;
wherein the second preset depth is greater than the first preset depth.
Optionally, the slope is a slope of 1: 2.5.
According to the technical scheme, the foundation pit is excavated in a layered and staggered manner, the foundation pit is partitioned on a horizontal plane, the corner brace of the current construction horizontal layer is poured to support the current construction horizontal layer, at the moment, the excavator can reserve soil in the opposite-support area of the current construction horizontal layer in the area to be inclined to the next horizontal layer, and the two horizontal layers are not affected with each other. Then the excavator can move to the corner support area to excavate the corner support area to the next horizontal layer, and the counter support of the current construction horizontal layer can be poured at the moment. Therefore, construction of adjacent horizontal layers in a staggered mode in a foundation pit with complex geological conditions in a sea filling area can be achieved, the digging machine can be used for directly entering the foundation pit to dig, the earthwork excavation efficiency in the foundation pit is improved, the engineering construction efficiency is improved, and the construction period is shortened.
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 schematic step view of a method for constructing a horizontal bracing structure of a diagonal bracing angle brace concrete of a foundation pit in a reclamation area according to a first embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the foundation pit engineering, the support system plays an extremely important role in the stability of the foundation pit, the construction period and the construction cost. In the process of foundation pit construction in the sea reclamation area, due to the fact that the geological condition of the sea reclamation area is complex, namely the engineering geological condition in a common project site is poor, from the perspective of engineering mechanics, mucky soil and other alluvial soil in the project site of the sea reclamation area belong to geology of a thick soft soil layer, and are extremely unfavorable for foundation pit supporting, and a dense diagonal bracing angle bracing concrete horizontal supporting structure is needed to be used for supporting the side wall of a foundation pit. In the traditional construction method, one layer of supporting structure is poured for excavating one layer of earthwork, but when the foundation pit cannot be set to a slope in a narrow foundation pit in a construction site where the foundation pit is located, the dense diagonal bracing and angle bracing concrete supporting structure occupies the narrow space in the foundation pit, so that the excavator is difficult to enter the foundation pit to excavate the earthwork, the technical problem of low earthwork excavation efficiency exists, and further the project period is long.
Therefore, the embodiment of the invention provides a construction method of a horizontal bracing and angle brace concrete supporting structure of a foundation pit in a sea reclamation area. Then the excavator can move to the corner support area to excavate the corner support area to the next horizontal layer, and the counter support of the current construction horizontal layer can be poured at the moment. Therefore, construction of adjacent horizontal layers in a staggered mode in a foundation pit with complex geological conditions in a sea filling area can be achieved, the excavator can be used for directly entering the foundation pit to excavate, the earth excavation efficiency in the foundation pit is improved, and the engineering construction efficiency is improved.
The inventive concept of the present application is further illustrated below with reference to some specific embodiments.
Referring to fig. 1, in a first embodiment of the present invention, a method for constructing a horizontal bracing structure of a foundation pit bracing angle brace in a reclamation area includes the following steps:
and S100, dividing the foundation pit into at least two horizontal layers along the vertical direction, wherein any horizontal layer comprises an angle support area and a butt support area.
Specifically, in the step, earthwork in the foundation pit is layered according to a design drawing, and each layer of space is partitioned according to the design drawing. It is easy to understand that, since the technical solution of the embodiment is suitable for the situation of narrow foundation pit, for example, for a rectangular foundation pit in the north-south direction, the corner brace area at the south end of each horizontal layer in the foundation pit can be divided into a zone; dividing a northern end corner brace area of each horizontal layer in the foundation pit into two areas; the third zone is a middle support zone in front of the first zone and the second zone. Thereby being beneficial to the transfer of large-scale machines such as follow-up command excavators and the like among all areas in the narrow place.
And S200, completing the construction of precast concrete tubular piles, triaxial mixing piles, concrete pouring support piles, support pile crown beams and corner brace area upright piles on the surface layer of the whole foundation pit.
In this step, standard operation before earth excavation is performed, and those skilled in the art can know how to perform this step according to relevant standards, which will not be described herein.
And S300, excavating earth on the surface layer of the whole foundation pit to a first horizontal layer, and taking the first horizontal layer as a current construction horizontal layer.
In this step, a plurality of excavators can be used to simultaneously excavate in each area of the surface layer of the full foundation pit. The excavation depth is determined according to a specific design drawing. The first horizontal layer is a space area where the first layer of supporting structure is located in the design drawing.
And S400, pouring a corner brace in the corner brace area of the current construction horizontal layer.
In the step, after the surface layer of the foundation pit is excavated to the first horizontal layer, the first corner brace can be poured. It is understood that the concrete casting process of the first gusset belongs to the prior art in the field, and the details are not repeated herein.
And S500, continuously excavating the opposite support area of the current construction horizontal layer and reserving soil for slope release to the next horizontal layer.
Compared with the traditional method of excavating a layer of earthwork and pouring a layer of supporting structure, the method has the advantages that the opposite support is not constructed temporarily in the step, the opposite support area of the current construction horizontal layer is excavated continuously, and soil is left to be put on the slope to the next horizontal layer. For example, the excavator in the bracing area begins to excavate earthwork from the surface of the foundation pit, and the excavation is not stopped after one layer of earthwork is excavated until the second horizontal layer is reached. And soil is left and slope is put in the process. And finishing the support of the side wall of the foundation pit where the support area is located through slope relief. For example, the slope is a slope of 1: 2.5.
In the step, the excavator is located in the diagonal bracing area, the diagonal bracing area is used for casting the diagonal bracing, and large-scale equipment in the two areas can be normally used.
And S600, continuously excavating the corner brace region of the current construction horizontal layer to the next horizontal layer, pouring the corner brace of the next horizontal layer, pouring the counter brace of the current construction horizontal layer, and taking the next horizontal layer as the current construction horizontal layer.
In the step, after the corner brace of the first layer of supporting structure is completed, the second corner brace of the second layer of supporting structure can be continuously constructed. Excavation earth is excavated to the designed depth of the second corner brace through the excavator, namely excavation is carried out to the next horizontal layer, and then supporting of the side wall of the foundation pit is completed through the corner brace. At the moment, the excavator in the opposite-bracing area can be transferred, the opposite bracing of the first-layer supporting structure in the first horizontal layer is cast and constructed, and the casting construction of the first-layer supporting structure is completed. At the moment, the second horizontal layer can be used as the current construction horizontal layer so as to continuously finish the subsequent excavation and supporting of the foundation pit earthwork.
Step S700, repeating step S500 and step S600 until the corner support and the butt support of the bottommost horizontal layer are completed.
Compared with the traditional construction method that one layer of supporting structure is completed by pouring the construction corner brace and the counter brace by excavating one layer of earthwork, the construction method provided by the embodiment adopts the steps of excavating in the foundation pit in a staggered mode in layers, partitioning the foundation pit on the horizontal plane, pouring the corner brace of the current construction horizontal layer to support the current construction horizontal layer, and at the moment, the excavator can reserve soil in the counter brace area of the current construction horizontal layer in the area and place the soil on the next horizontal layer without influencing the current construction horizontal layer and the counter brace. Then the excavator can move to the corner support area to excavate the corner support area to the next horizontal layer, and the counter support of the current construction horizontal layer can be poured at the moment. Therefore, construction of adjacent horizontal layers in a staggered mode in a foundation pit with complex geological conditions in a sea filling area can be achieved, the excavator can be used for directly entering the foundation pit to excavate, the earth excavation efficiency in the foundation pit is improved, and the engineering construction efficiency is improved.
As an option of this embodiment, in order to further improve the supporting effect of the slope, before step S600, the construction method further includes:
and constructing the slope-releasing protection surface.
For example, specifically include: finishing the slope surface of the slope; inserting a plurality of steel bars into the slope surface, wherein the steel bars protrude out of the slope surface by a preset length; spraying concrete on the slope surface according to the preset length of the reinforcing steel bars to form a first layer of protective surface; after the first layer of protective surface is finally set, laying a steel bar net sheet on the surface of the first layer of protective surface, and arranging a slope surface drainage system; and spraying concrete on the surface of the first layer of protective surface to form a second layer of protective surface, and spraying water to the second layer of protective surface for maintenance after the second layer of protective surface is finally set, so that the protective surface construction is completed. Whereby the landslide is reinforced by the combined action of high pressure shotcrete and reinforcing bars driven into the landslide to provide a temporary supporting structure.
For ease of understanding, a specific embodiment is shown: after finishing the slope according to the slope of 1:2.5, the short reinforcing steel bars with L of 1.5 m phi 16 phi 1200 x 1200 are driven in the vertical direction of the slope, the interval between the short reinforcing steel bars is 2m, and the short reinforcing steel bars leak out of the slope surface by 20 cm. Wherein the short reinforcing steel bars are bent after the reinforcing steel bar net sheets are hung. The short steel bars are used for controlling the thickness of the sprayed concrete. Spraying anchor is carried out twice, steel plate meshes are laid between gaps of the two concrete spraying processes, and a drainage system is arranged. The drainage system is characterized in that a water drain pipe of a water drain pipe L of 400mm phi 100mmpvc is arranged on a slope surface, the water drain pipe is installed downwards according to a gradient of 5%, and the horizontal and vertical distances of the water drain pipe are 2000 mm. If the thickness of the spray anchor is designed to be 80mm, the thickness of the first spray and the thickness of the second spray are both 40 mm. And the concrete is sprayed in layers, sections and zones in sequence, and the spraying sequence moves spirally from bottom to top. A gap exists between two sprayed concretes, and the gap is generally carried out after the final setting of the previous layer of protective surface.
Based on the first embodiment of the present invention, a second embodiment of the present invention is provided. In this embodiment, after the steps of completing the corner brace and the butt brace up to the bottommost horizontal layer, the construction method further includes:
and S800, pouring a foundation slab for construction below the bottommost horizontal layer.
And S900, pouring a construction foundation bottom plate for each horizontal layer in the at least two horizontal layers in sequence along the vertical upward direction, and removing the angle brace and the opposite brace of each horizontal layer to finish the whole underground structure.
Specifically, the embodiment uses a complete foundation pit excavation implementation method, namely, the method comprises earth excavation and subsequent support replacement, support disassembly and support and construction of underground structures such as foundation slabs and force transmission plates. It is easily understood that the foregoing steps can be performed according to relevant standards and specific designs by those skilled in the art, and are not essential to the invention of this application, and will not be described herein again.
Optionally, the method further comprises backfilling the side wall of the foundation pit after the whole underground structure is completed.
A third embodiment of the present invention is proposed based on the first and second embodiments of the present invention. In this embodiment, before step S200, the method further includes:
and arranging a plurality of settlement monitoring points and recharging wells around the foundation pit at the ground surface foundation pit.
Particularly, the step is used for monitoring the settlement condition and the dewatering and drainage condition of the surrounding environment of the foundation pit so as to monitor the construction of the foundation pit, timely prewarning when the side wall of the foundation pit has problems in supporting and protecting, and ensuring that surrounding buildings are not affected. It is easily understood that the settlement monitoring technology and the dewatering design can be implemented according to the relevant standards and specific situations by those skilled in the art, and are not described herein again.
A fourth embodiment of the present invention is proposed based on the first to third embodiments of the present invention. In this embodiment, step S500 includes:
and continuously excavating the opposite support area of the current construction horizontal layer to a second preset depth and reserving soil for slope putting to the next horizontal layer.
The step S600 includes:
and according to the design depth of the horizontal layer, continuously excavating the corner brace region of the current construction horizontal layer from the first preset depth to the next horizontal layer and pouring the corner brace of the next horizontal layer.
Wherein the second preset depth is greater than the first preset depth.
Particularly, the excavation depth of the opposite support area is larger than that of the corner support area, so that pouring construction of corner supports in the corner support area is facilitated.
In one embodiment, the construction method comprises the steps of:
a. according to the design drawing, the foundation pit comprises two layers of supporting structures, namely, earthwork in the foundation pit is divided into two horizontal layers along the vertical direction. Dividing the south end corner brace area of each horizontal layer in the foundation pit into a zone; the north-end corner brace area of each horizontal layer in the foundation pit is divided into two areas; the three regions are middle support regions in front of the first region and the second region. Thereby being beneficial to the transfer of large-scale machines such as follow-up command excavators and the like among all areas in the narrow place.
b. After the pre-tensioning method precast concrete pipe piles, the triaxial mixing piles, the concrete pouring support piles, the support pile crown beams and the corner brace position upright piles are constructed, excavating the earthwork of the whole foundation pit to the position of-2.800 m of a first position, pouring and constructing a first corner brace, temporarily not constructing the first counter brace, excavating the earthwork of three areas of a first horizontal layer, and reserving the soil to the position of-7.000 m.
c. And (4) spraying concrete with the thickness of 80mm on the pile top of the three-region grouting support pile and the slope surface of the basement outer wall pipe pile (the elevation is 7.000m) by using a hanging net, and completing spray anchor support.
d. And excavating earth in the first area and the second area of the first layer to-6.450 m to the position of the second corner brace, namely reaching the second layer, and pouring and constructing the second corner brace. And then continuing to excavate the earthwork in the first area and the second area of the second layer to the bottom of the foundation pit cushion layer.
e. And (5) pouring and constructing a first opposite support.
f. And excavating three regions of earthwork on the second layer to lay a slope, reserving soil, laying the slope for the second time to the bottom of the foundation pit cushion layer, and pouring and constructing a second channel counter brace.
g. And continuously excavating earthwork at the second slope-laying position to the bottom of the foundation pit cushion layer.
The above description is only an alternative embodiment of the present invention, and 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 (9)
1. A construction method for a horizontal supporting structure of foundation pit bracing angle brace concrete in a sea reclamation area is characterized by comprising the following steps:
dividing the foundation pit into at least two horizontal layers along the vertical direction, wherein any horizontal layer comprises an angle support area and a counter support area;
the construction of precast concrete tubular piles, triaxial mixing piles, concrete pouring support piles, support pile crown beams and corner brace area upright piles is finished on the surface layer of the whole foundation pit;
excavating earth on the surface layer of the whole foundation pit to a first horizontal layer, and taking the first horizontal layer as a current construction horizontal layer;
pouring a corner brace in a corner brace area of the current construction horizontal layer;
continuously excavating the opposite support area of the current construction horizontal layer and reserving soil for slope placement to the next horizontal layer;
continuously excavating the corner brace area of the current construction horizontal layer to the next horizontal layer, pouring the corner brace of the next horizontal layer, pouring the counter brace of the current construction horizontal layer, and then taking the next horizontal layer as the current construction horizontal layer;
and repeatedly executing the steps of continuously excavating the diagonal bracing region of the current construction horizontal layer and reserving soil for slope placement to the next horizontal layer, continuously excavating the diagonal bracing region of the current construction horizontal layer to the next horizontal layer and pouring the diagonal bracing of the next horizontal layer, pouring the diagonal bracing of the current construction horizontal layer, and then taking the next horizontal layer as the current construction horizontal layer until the diagonal bracing and the diagonal bracing of the bottommost horizontal layer are finished.
2. The construction method according to claim 1, wherein before the step of excavating the corner brace region of the current construction horizontal layer to the next horizontal layer and pouring the corner brace of the next horizontal layer, the construction method further comprises:
and constructing the slope-releasing protection surface.
3. The construction method according to claim 2, wherein the step of constructing the slope-releasing protecting surface comprises:
finishing the slope surface of the slope;
inserting a plurality of steel bars into the slope surface, wherein the steel bars protrude out of the slope surface by a preset length;
spraying concrete on the slope surface according to the preset length of the reinforcing steel bars to form a first layer of protective surface;
after the first layer of protective surface is finally set, laying a steel bar net sheet on the surface of the first layer of protective surface, and arranging a slope surface drainage system;
and spraying concrete on the surface of the first layer of protective surface to form a second layer of protective surface, and spraying water to the second layer of protective surface for maintenance after the second layer of protective surface is finally set, so that the protective surface construction is completed.
4. The construction method according to claim 1, wherein after the steps of finishing the corner brace and the counter brace up to the bottommost horizontal layer, the construction method further comprises:
pouring a construction foundation bottom plate on the base below the bottommost horizontal layer;
and sequentially pouring a construction foundation bottom plate for each horizontal layer in the at least two horizontal layers along the vertical upward direction, and removing the corner brace and the butt brace of each horizontal layer to complete the whole underground structure.
5. The construction method according to claim 4, wherein after the steps of sequentially pouring a construction foundation slab for each horizontal layer of the at least two horizontal layers and removing the corner brace and the counter brace of each horizontal layer in the vertically upward direction are completed, the construction method further comprises:
and backfilling the side wall of the foundation pit.
6. The construction method according to claim 5, wherein before the steps of constructing the precast concrete pipe pile, the triaxial mixing pile, the concrete pouring support pile, the support pile crown beam and the corner brace area stand column pile on the surface layer of the full foundation pit, the construction method further comprises the following steps of:
and arranging a plurality of settlement monitoring points and recharging wells around the foundation pit on the ground surface.
7. The construction method according to claim 1, wherein the step of continuously excavating the corner brace area of the current construction horizontal layer to the next horizontal layer and pouring the corner brace of the next horizontal layer comprises:
and according to the design depth of the horizontal layer, continuously excavating the corner brace region of the current construction horizontal layer from the first preset depth to the next horizontal layer and pouring the corner brace of the next horizontal layer.
8. The construction method according to claim 7, wherein the step of continuously excavating the braced area of the current construction horizontal layer and reserving soil for slope to the next horizontal layer comprises the following steps:
continuously excavating the opposite support area of the current construction horizontal layer to a second preset depth and reserving soil for slope putting to the next horizontal layer;
wherein the second preset depth is greater than the first preset depth.
9. The construction method according to any one of claims 1 to 8, wherein the relief slope is a 1:2.5 slope.
Priority Applications (1)
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