CN111827303A - Backfill-free foundation pit permanent support system and construction method thereof - Google Patents
Backfill-free foundation pit permanent support system and construction method thereof Download PDFInfo
- Publication number
- CN111827303A CN111827303A CN202010733176.3A CN202010733176A CN111827303A CN 111827303 A CN111827303 A CN 111827303A CN 202010733176 A CN202010733176 A CN 202010733176A CN 111827303 A CN111827303 A CN 111827303A
- Authority
- CN
- China
- Prior art keywords
- foundation pit
- slope
- supporting structure
- waterproof
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
-
- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Foundations (AREA)
Abstract
The invention provides a backfill-free foundation pit permanent support system and a construction method thereof, relating to the technical field of foundation pit construction; the backfill-free foundation pit permanent support system comprises an inner slope support structure, an outer slope waterproof support structure, a frame support structure and a capping structure which are constructed in sequence. According to the invention, the original temporary-supported slope inner supporting structure is used as the inner support of the slope, the slope outer waterproof supporting structure is used as the outer support and the waterproof structure of the slope, the frame supporting structure and the connecting beam are used for reinforcing and supporting and are used as the mounting foundation of the capping structure, and finally the capping of the fertilizer tank is completed through the capping structure, so that the sealing of the fertilizer tank can be effectively completed under the condition that the foundation pit is not backfilled, and the water-resisting performance of the foundation pit slope is improved.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a backfill-free foundation pit permanent support system and a construction method thereof.
Background
A foundation pit is a space excavated from the ground downward for constructing the underground portion of a building. The foundation pit support is a temporary measure adopted for the construction of the underground part of the main structure, the foundation pit is generally temporary, and the design service life is 1-2 years. When the foundation pit support is designed, the changes of load, material performance and surrounding environment when the foundation pit is used for a long time are not considered, and the foundation pit support needs to be backfilled in time after the construction of the underground structure is completed.
However, in the construction of building engineering, the situation that the underground structural body cannot bear any lateral soil pressure after being built due to structural seismic requirements or special stress forms of the structural body and the like is often encountered, the foundation pit cannot be backfilled, water cannot exist in the foundation pit, the foundation pit support becomes a permanent structure, and the foundation pit becomes a permanent foundation pit; therefore, how to seal the permanent foundation pit without backfilling and improve the water-resisting performance of the foundation pit slope is a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a backfill-free foundation pit permanent support system, which aims to solve the problems that how to seal the existing permanent foundation pit without backfilling and improve the water-resisting performance.
In order to solve the technical problems, the invention provides a backfill-free foundation pit permanent support system, which has the following specific technical scheme:
a backfill-free foundation pit permanent support system comprises an inner side slope support structure, an outer side slope waterproof support structure, a frame support structure and a capping structure;
the inner side slope supporting and protecting structure is arranged in the side slope of the foundation pit;
the side slope outer waterproof supporting structure is arranged on the foundation pit side slope;
the frame supporting structure is arranged between the slope outer waterproof supporting structure and the main body structure, preset distances are reserved between the slope outer waterproof supporting structure and the main body structure respectively, and the frame supporting structure is connected with the slope outer waterproof supporting structure through a plurality of connecting beams arranged from top to bottom;
the capping structure is arranged on the slope outer waterproof supporting structure and the frame supporting structure and is connected with the main body structure.
Further, the inner side slope supporting and protecting structure comprises a first anchor rod anchored in the foundation pit side slope and a surface layer; one end of the first anchor rod is positioned in the waterproof supporting structure outside the side slope; the surface layer is arranged on the foundation pit side slope.
Further, the slope outer waterproof supporting structure comprises a filling body, a fixing layer, a first waterproof layer and a lattice type retaining wall which are sequentially constructed from inside to outside; the filling body is arranged on the surface layer; the lattice type retaining wall is connected with the frame supporting structure through the connecting beam.
Further, the device also comprises a second anchor rod; one end of the second anchor rod is anchored in the filling body, and the other end of the second anchor rod is anchored in the foundation pit slope.
Further, the foundation pit side slope is excavated into an inclined shape; in the vertical direction, the surface layer, the filling body and the waterproof layer are in a step shape.
Further, the frame supporting structure comprises a plurality of vertically arranged frame columns and a plurality of horizontally arranged frame beams;
the plurality of frame columns are arranged at intervals around the foundation pit side slope;
and the plurality of frame beams are arranged at intervals along the vertical direction and are respectively connected with the plurality of frame columns.
Further, the capping structure comprises an earth covering retaining wall, a cover plate, a fertilizer groove top plate, a second waterproof layer and a soil covering layer;
the earthing retaining wall is arranged on the frame supporting structure;
one end of the cover plate is connected with the main body structure, the other end of the cover plate is installed on the soil-covered retaining wall, and the horizontal height of the cover plate is lower than that of the foundation pit side slope;
the fertilizer tank top plate is arranged on the uppermost connecting beam, and the horizontal height of the fertilizer tank top plate is lower than that of the soil covering retaining wall;
the second waterproof layer is arranged on the cover plate and the top plate of the fertilizer tank, and when the slope outer waterproof supporting structure comprises the first waterproof layer, the second waterproof layer is connected with the first waterproof layer;
the soil covering layer is arranged on the second waterproof layer.
Furthermore, the cover plate is flexibly connected with the soil covering retaining wall.
Further, still including setting up in the foundation ditch side slope cut water curtain.
The second purpose of the invention is to provide a construction method of the backfill-free foundation pit permanent support system, which comprises the following steps:
constructing a side slope inner supporting structure in a foundation pit side slope;
constructing a side slope external waterproof supporting structure on the foundation pit side slope;
constructing a frame supporting structure between the slope outer waterproof supporting structure and the main structure;
the frame supporting structure is respectively away from the slope outer waterproof supporting structure and the main body structure by a preset distance, and the frame supporting structure is connected with the slope outer waterproof supporting structure through a plurality of connecting beams;
constructing a capping structure on the slope outer waterproof supporting structure and the frame supporting structure, wherein the capping structure is connected with the main structure
According to the backfill-free foundation pit permanent support system and the construction method provided by the invention, the inner side slope support structure of the original temporary support is used as the inner side support of the side slope, the outer side slope waterproof support structure is used as the outer support and the waterproof structure of the side slope, the frame support structure and the connecting beam are used for reinforcing and supporting and used as the mounting foundation of the capping structure, and finally the capping of the fertilizer tank is completed through the capping structure, so that the sealing of the fertilizer tank can be effectively completed under the condition that the foundation pit is not backfilled, and the water-resisting property of the side slope of the foundation pit is improved.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a backfill-free foundation pit permanent supporting system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another backfill-free foundation pit permanent supporting system provided in the embodiment of the invention;
fig. 3 is a partial structural schematic view of the backfill-free foundation pit permanent supporting system in fig. 1 or fig. 2;
fig. 4 is a schematic structural diagram of another backfill-free foundation pit permanent supporting system according to an embodiment of the present invention;
fig. 5 is a partial structural schematic view of the backfill-free foundation pit permanent supporting system in fig. 4.
Icon:
1-foundation pit side slope; 2-main body structure; 3-a first anchor rod; 4-surface layer; 5-a filler; 6-a fixing layer; 7-a first waterproof layer; 8-lattice retaining wall; 9-connecting the beams; 10-a second anchor rod; 11-frame posts; 12-a frame beam; 13-covering soil and retaining walls; 14-a cover plate; 15-top plate of the fertilizer groove; 16-a second waterproof layer; 17-covering soil layer; 18-a flexible member; 19-water cut-off curtain; 20-supporting piles; 21-a crown beam; 22-a cushion layer; 23-base.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
With reference to fig. 1, 2, and 3, the present embodiment provides a backfill-free permanent support system for a foundation pit, which specifically includes three structural forms, that is, the structural form applied to the two slope-excavation foundation pits in fig. 1 and 2, where the foundation pit side slope 1 is inclined, and the structural form applied to the vertical excavation foundation pit in fig. 4, where the foundation pit side slope 1 is vertical.
Based on the problems in the background art, the inventor finds that structurally, the foundation pit is formed by combining a plurality of building side slopes, and the building side slopes do not need to be backfilled, so that the permanent foundation pit can be supported by the permanent side slopes. Although the permanent foundation pit does not need to be backfilled, the top of the fertilizer tank needs to be sealed after the construction of the underground main structure 2 is completed, which cannot be solved without consideration of the existing side slope supporting structure.
In addition, when the permanent side slope is supported, water in the slope surface is usually led out by using the drain holes, that is, the supporting structure is required to have certain water permeability, which is contrary to the requirement that the supporting structure is required to have water-resisting property in the permanent foundation pit.
In addition, in the aspect of slope structure water insulation, the dam construction engineering has mature experience. However, the water-proof structure of the dam prevents water on the outside from penetrating into the interior of the slope through the supporting structure, and the permanent foundation pit prevents water in the slope from penetrating into the foundation pit through the supporting structure. Due to the different water-resisting directions, the waterproof structure of the dam is not suitable for use in permanent foundation pits.
It is therefore not sufficient for the prior art to solve the problems of the background art, and therefore the present embodiment provides a permanent supporting structure based on an existing temporary supporting structure, which includes an inner slope supporting structure, an outer slope waterproof supporting structure, a frame supporting structure, and a capping structure.
The side slope inner supporting structure of the embodiment is installed in the foundation pit side slope 1, and when a foundation pit is processed into a permanent foundation pit from a temporary foundation pit, the side slope inner supporting is a temporary supporting erected when the foundation pit is used for temporary foundation pit construction, so that the embodiment can be understood as ingeniously utilizing the original temporary supporting as a part of the permanent supporting.
Specifically, the inner side slope supporting structure of the embodiment includes a plurality of first anchor rods 3 anchored in the foundation pit side slope 1 and a surface layer 4 constructed on the foundation pit side slope, the first anchor rods 3 may be steel bars or steel strands, the length of exposed sections thereof should be determined according to the design of a permanent supporting structure, and the surface layer 4 may be formed by pouring concrete. In order to improve the anchoring performance, one end of the first anchor rod 3 of the embodiment is located outside the side slope in the waterproof supporting structure, and the other end is located in the foundation pit side slope 1.
The outer waterproof supporting construction of side slope of this embodiment sets up on foundation ditch side slope 1 for support the side slope, and play the water proof effect, the frame bearing structure of this embodiment sets up between outer waterproof supporting construction of side slope and major structure 2, and has the distance of predetermineeing with outer waterproof supporting construction of side slope and major structure 2 respectively, and the frame bearing structure is connected through a plurality of tie-beams 9 that arrange from top to bottom with the outer waterproof supporting construction of side slope.
The capping structure of this embodiment is installed on waterproof supporting structure outside the side slope and frame bearing structure to be connected with major structure 2, in order to realize the capping of fertile groove of foundation ditch, fertile groove of this embodiment refers to the space between major structure 2 and foundation ditch side slope 1, and major structure 2 of this embodiment can be the capital construction facility of construction after the foundation ditch excavation, structures such as subway station.
According to the backfill-free foundation pit permanent support system, the slope inner support structure of the original temporary support is used as the inner support of the slope, the slope outer waterproof support structure is used as the outer support and the waterproof structure of the slope, the frame support structure and the connecting beam 9 are used for reinforcing and supporting and used as the mounting base of the capping structure, and finally the capping of the fertilizer tank is completed through the capping structure, so that the sealing of the fertilizer tank can be effectively completed under the condition that the foundation pit is not backfilled, and the water-resisting performance of the foundation pit slope 1 is improved.
As a preferred embodiment of this embodiment, this embodiment improves the specific structural form of the slope external waterproof supporting structure to improve the supporting and water-resisting performance thereof.
Referring to fig. 1 and 2, the slope exterior waterproof supporting structure of the embodiment includes a filling body 5, a fixed layer 6, a first waterproof layer 7 and a lattice-type retaining wall 8, which are sequentially constructed from inside to outside; wherein, the filling body 5 of the embodiment is arranged on the surface layer 4; the lattice retaining wall 8 of this embodiment is connected to the frame support structure by connecting beams 9.
In this embodiment, the temporary head of the first anchor rod 3 is located and closely attached to the surface layer 4, and the surface layer 4 in this embodiment may be a steel mesh + sprayed concrete, a finished steel mesh + sprayed concrete, or other materials that can be used for temporary support.
The filling body 5 of the embodiment can be low-grade concrete and is used for filling a gap between the formwork and the surface layer 4, and preferably, the slope outer waterproof supporting structure further comprises a second anchor rod 10; one end of a second anchor rod 10 is anchored in the filling body 5, and the other end of the second anchor rod is anchored in the foundation pit side slope 1, so that the connection between the filling body and the surface layer 4 is increased; the second anchor 10 of the present embodiment is of the same or similar construction as the first anchor 3.
The fixed bed 6 of this embodiment is brick wall or template, and brick wall or the vertical setting of template, when the foundation ditch for putting the slope excavation foundation ditch, brick wall or template are the echelonment along with surface course 4 slope design.
The first waterproof layer 7 of this embodiment may be an existing waterproof structure layer, for example, formed by constructing materials such as cement mortar, the lattice-type retaining wall 8 of this embodiment is a reinforced concrete structure, and is located on the outer side of a brick wall or a formwork, and the end of the exposed section of the first anchor rod 3 is located inside the node of the lattice-type retaining wall 8.
The frame supporting structure of the embodiment comprises a plurality of vertically arranged frame columns 11 and a plurality of horizontally arranged frame beams 12; a plurality of frame columns 11 are arranged at intervals around the foundation pit side slope 1; the plurality of frame beams 12 are arranged at intervals in the vertical direction and are respectively connected with the plurality of frame columns 11, and the connecting beam 9 of the embodiment is used for connecting the frame column 11, the frame beam 12 node and the lattice type retaining wall 8 node.
The capping structure of this embodiment includes an earth-covered retaining wall 13, a cover plate 14, a fertilizer tank top plate 15, a second waterproof layer 16, and a soil-covering layer 17. Wherein, the earth-covering retaining wall 13 of the embodiment is installed on the frame supporting structure, specifically on the uppermost frame beam 12, and is connected with the fertilizer trough top plate 15; one end of a cover plate 14 is connected with the main structure 2, the other end of the cover plate is arranged on the soil covering retaining wall 13, and the horizontal height of the cover plate 14 is lower than that of the foundation pit side slope 1; the fertilizer trough top plate 15 of the present embodiment is mounted on the uppermost connecting beam 9, and the level of the fertilizer trough top plate 15 is lower than that of the earth retaining wall 13.
The second waterproof layer 16 of the embodiment is arranged on the cover plate 14 and the top plate 15 of the fertilizer tank and is connected with the first waterproof layer 7; a cover soil layer 17 of the present embodiment is provided on the second waterproof layer 16. Effective sealing of the fertilizer tank can be achieved through the cover plate 14, the fertilizer tank top plate 15, the soil covering layer 17 and the like, backfilling is not needed, good supporting can be conducted on the side slope through matching of the frame supporting structure and the connecting beam 9, and the supporting effect can be further improved through combining the side slope inner supporting structure and the side slope outer waterproof supporting structure.
As a preferred embodiment of this embodiment, the cover plate 14 of this embodiment is flexibly connected with the earth-covering retaining wall 13, and the flexible connection can be realized by placing a flexible member 18 between the two, or can be connected by polyurethane sealant or the like, so that a certain displacement between the main body structure and the supporting structure can be allowed by the deformation of the flexible member 18.
As a preferred embodiment of this embodiment, in order to further improve the water-resisting effect, the backfill-free foundation pit permanent supporting system of this embodiment further includes a water-stopping curtain 19 disposed in the foundation pit slope 1, and the water-stopping curtain 19 is preferably disposed in a vertical direction and forms a double-layer water-resisting structure with the first waterproof layer 7, the top of which has a certain distance from the ground, and the bottom of which is lower than the cushion layer 22 of the foundation pit.
The following description is made of the construction method of the backfill-free foundation pit permanent support system for the slope-setting excavation foundation pit and the vertical excavation foundation pit of the embodiment:
firstly, when adopting current interim foundation ditch reinforcement to be permanent foundation ditch, have the first stock 3 as temporary support this moment, its construction step is as follows:
1. and constructing a first layer of template, a second anchor rod 10 and a filling body reinforcement at a designed position, wherein the top of the first layer of template is lower than the position of the first anchor rod 3 at the lowest layer, and then pouring the filling body.
2. And paving part of the first waterproof layer 7, and synchronously constructing the main foundation 23, the outer wall, the frame foundation 23, the frame column 11, the frame beam 12 and the lowest latticed retaining wall 8.
3. And (3) erecting a construction platform on the first layer of filling bodies and the main body outer wall, and constructing the first anchor rod 3 at the lowest layer.
4. And (5) continuously constructing the upper layer of template, the second anchor rods 10 and the filling body reinforcing bars, and pouring the filling body when the top of the upper layer of template is lower than the position of the first anchor rods 3 of the upper layer.
5. And paving part of the first waterproof layer 7, and synchronously constructing an upper layer of main body outer wall, a frame foundation 23, a frame column 11, a frame beam 12, a connecting beam 9 and an upper layer of lattice type retaining wall 8.
6. And (4) erecting a construction platform on the layer of filling bodies and the main body outer wall, and constructing a first anchor rod 3.
7. And (4) continuing the steps 4, 5 and 6 until the uppermost lattice retaining wall 8 and the frame columns 11 are constructed.
8. Constructing a frame beam 12 at the uppermost layer, a connecting beam 9, a fertilizer tank top plate 15, an earth covering retaining wall 13 and a cover plate 14.
9. A second waterproof layer 16 is laid.
10. And filling a covering soil layer 17.
Secondly, when a general permanent foundation pit is constructed, the temporary first anchor rod 3 support is not available at the moment, and the construction method is as follows:
1. and excavating a first layer of soil at a design position, constructing a first anchor rod 3, a construction surface layer 4 and a waist beam, and constructing a temporary anchor head.
2. And after the first anchor rods 3 and the surface layer 4 reach the design strength, performing next layer excavation construction until the construction reaches the bottom of the foundation pit, and finishing the excavation of the foundation pit.
3. And all the steps of reinforcing the temporary foundation pit into a permanent foundation pit are combined with the construction progress of the main body outer wall, and a permanent supporting structure is constructed from the pit bottom to the upper part, wherein the construction of the first anchor rod 3 is omitted in one step.
In addition, as shown in fig. 4 and 5, when the foundation pit is a vertical excavation type foundation pit, the backfill-free foundation pit permanent supporting system of the embodiment includes a temporary supporting structure, a permanent supporting structure, a cover plate 14 and a waterproof layer.
Wherein, the temporary supporting structure comprises supporting piles 20, a crown beam 21, a surface layer 4, a first anchor rod 3, a waist beam (not shown in the figure) and a temporary anchor head (not shown in the figure); the surface course 4 is located fender pile 20 and is close to foundation ditch one side, and first stock 3 passes surface course 4, and the body of rod is most located the ground internal, and the waist rail is located the position that first stock 3 exposes section and hugs closely surface course 4 with interim anchor head.
The permanent supporting structure of this embodiment also includes the above-mentioned surface layer 4, filling body 5, fixing layer 6, first waterproof layer 7, lattice-type retaining wall 8 and cover plate 14, but does not include the above-mentioned frame supporting structure.
The construction method of the vertical excavation type permanent foundation pit of the embodiment is also divided into two types, one is to reinforce the temporary foundation pit into the permanent foundation pit, and the other is to reinforce the general permanent foundation pit.
The construction method of the backfill-free foundation pit permanent support system for reinforcing the temporary foundation pit into the permanent foundation pit comprises the following steps:
1. and constructing a first layer of template, a second anchor rod 10 and a filling body reinforcement at a designed position, wherein the top of the first layer of template is lower than the position of the first anchor rod 3 at the lowest layer, and pouring the filling body.
2. And laying part of the first waterproof layer 7, and synchronously constructing the main foundation 23, the outer wall and the lowest layer of the lattice type retaining wall 8.
3. And (3) erecting a construction platform on the first layer of filling bodies and the main body outer wall, and constructing the first anchor rod 3 at the lowest layer.
4. And (5) continuously constructing the upper layer of template, the second anchor rods 10 and the filling body reinforcing bars, and pouring the filling body when the top of the upper layer of template is lower than the position of the first anchor rods 3 of the upper layer.
5. And laying part of the second waterproof layer 16, and synchronously constructing a layer of lattice retaining wall 8 on the outer wall of the main body.
6. And (4) erecting a construction platform on the layer of filling bodies and the main body outer wall, and constructing a first anchor rod 3.
7. And (4) continuing to the steps (4) to (6) until the lattice type retaining wall 8 at the uppermost layer is constructed.
8. The cover plate 14 is constructed. 9. A second waterproof layer 16 is laid.
10. And filling a covering soil layer 17.
Secondly, the construction method of the backfill-free foundation pit permanent support system of the general permanent foundation pit of the embodiment is as follows:
1. constructing a support pile 20 and a crown beam 21 at a designed position;
2. and excavating a first layer of soil, and constructing a first anchor rod 3, a waist beam, a surface layer 4 and a temporary anchor head.
3. And after the anchor rod and the surface layer 4 reach the design strength, performing next layer of excavation construction until the construction reaches the bottom of the foundation pit, and finishing the excavation of the foundation pit.
4. And (3) according to the step of reinforcing the temporary foundation pit vertically excavated into the permanent foundation pit, combining the construction progress of the main body outer wall, and constructing a permanent supporting structure from the pit bottom to the top, wherein the first anchor rod 3 is omitted in one step.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A backfill-free foundation pit permanent support system is characterized by comprising an inner slope support structure, an outer slope waterproof support structure, a frame support structure and a capping structure;
the inner side slope supporting and protecting structure is arranged in the side slope of the foundation pit;
the side slope outer waterproof supporting structure is arranged on the foundation pit side slope;
the frame supporting structure is arranged between the slope outer waterproof supporting structure and the main body structure, preset distances are reserved between the slope outer waterproof supporting structure and the main body structure respectively, and the frame supporting structure is connected with the slope outer waterproof supporting structure through a plurality of connecting beams arranged from top to bottom;
the capping structure is arranged on the slope outer waterproof supporting structure and the frame supporting structure and is connected with the main body structure.
2. The backfill-free foundation pit permanent support system of claim 1, wherein the in-slope support structure comprises a first anchor anchored in the foundation pit slope and a facing; one end of the first anchor rod is positioned in the waterproof supporting structure outside the side slope; the surface layer is arranged on the foundation pit side slope.
3. The backfill-free foundation pit permanent support system according to claim 2, wherein the slope-outside waterproof support structure comprises a filling body, a fixing layer, a first waterproof layer and a lattice-type retaining wall which are sequentially constructed from inside to outside; the filling body is arranged on the surface layer; the lattice type retaining wall is connected with the frame supporting structure through the connecting beam.
4. The backfill-free foundation pit permanent support system of claim 3, further comprising a second anchor; one end of the second anchor rod is anchored in the filling body, and the other end of the second anchor rod is anchored in the foundation pit slope.
5. The backfill-free foundation pit permanent support system according to claim 3, wherein the foundation pit side slope excavation is inclined; in the vertical direction, the surface layer, the filling body and the waterproof layer are in a step shape.
6. The backfill-free foundation pit permanent support system of claim 1, wherein the frame support structure comprises a plurality of vertically arranged frame columns and a plurality of horizontally arranged frame beams;
the plurality of frame columns are arranged at intervals around the foundation pit side slope;
and the plurality of frame beams are arranged at intervals along the vertical direction and are respectively connected with the plurality of frame columns.
7. The backfill-free foundation pit permanent support system according to any one of claims 1-6, wherein the capping structure comprises an earth-covered retaining wall, a cover plate, a fertilizer tank top plate, a second waterproof layer and a soil covering layer;
the earthing retaining wall is arranged on the frame supporting structure;
one end of the cover plate is connected with the main body structure, the other end of the cover plate is installed on the soil-covered retaining wall, and the horizontal height of the cover plate is lower than that of the foundation pit side slope;
the fertilizer tank top plate is arranged on the uppermost connecting beam, and the horizontal height of the fertilizer tank top plate is lower than that of the soil covering retaining wall;
the second waterproof layer is arranged on the cover plate and the top plate of the fertilizer tank, and when the slope outer waterproof supporting structure comprises the first waterproof layer, the second waterproof layer is connected with the first waterproof layer;
the soil covering layer is arranged on the second waterproof layer.
8. The backfill-free foundation pit permanent support system according to claim 7, wherein the cover plate is flexibly connected with the earth-covered retaining wall.
9. The backfill-free foundation pit permanent support system according to any one of claims 1-6, further comprising a water interception curtain disposed within the foundation pit slope.
10. A construction method for constructing the backfill-free foundation pit permanent support system of any one of claims 1-9, comprising the following steps:
constructing a side slope inner supporting structure in a foundation pit side slope;
constructing a side slope external waterproof supporting structure on the foundation pit side slope;
constructing a frame supporting structure between the slope outer waterproof supporting structure and the main structure;
the frame supporting structure is respectively away from the slope outer waterproof supporting structure and the main body structure by a preset distance, and the frame supporting structure is connected with the slope outer waterproof supporting structure through a plurality of connecting beams;
and constructing a capping structure on the slope outer waterproof supporting structure and the frame supporting structure, wherein the capping structure is connected with the main body structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010733176.3A CN111827303B (en) | 2020-07-27 | 2020-07-27 | Backfill-free foundation pit permanent support system and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010733176.3A CN111827303B (en) | 2020-07-27 | 2020-07-27 | Backfill-free foundation pit permanent support system and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111827303A true CN111827303A (en) | 2020-10-27 |
| CN111827303B CN111827303B (en) | 2021-06-01 |
Family
ID=72925016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010733176.3A Active CN111827303B (en) | 2020-07-27 | 2020-07-27 | Backfill-free foundation pit permanent support system and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111827303B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653104A (en) * | 2021-08-25 | 2021-11-16 | 中国建筑第八工程局有限公司 | Waterproof structure at underground wall and construction method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012144890A (en) * | 2011-01-11 | 2012-08-02 | Toko Geotech Corp | Net for foundation construction of planting, and method of foundation construction of planting and planting method using the net |
| CN104895089A (en) * | 2015-04-08 | 2015-09-09 | 山东大学 | Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles |
| CN105735325A (en) * | 2016-04-20 | 2016-07-06 | 山东大学 | Intensified permanent support assembly type basement structure system and construction method |
| CN107268638A (en) * | 2017-08-11 | 2017-10-20 | 广西大学 | Water rich strata Deep Foundation Pit of Metro Stations side wall waterproof construction and its construction method |
| CN110387886A (en) * | 2019-06-06 | 2019-10-29 | 广东宏骏建筑工程有限公司 | Civil air defense constructions and installations foundation pit supporting construction and its construction method |
-
2020
- 2020-07-27 CN CN202010733176.3A patent/CN111827303B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012144890A (en) * | 2011-01-11 | 2012-08-02 | Toko Geotech Corp | Net for foundation construction of planting, and method of foundation construction of planting and planting method using the net |
| CN104895089A (en) * | 2015-04-08 | 2015-09-09 | 山东大学 | Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles |
| CN105735325A (en) * | 2016-04-20 | 2016-07-06 | 山东大学 | Intensified permanent support assembly type basement structure system and construction method |
| CN107268638A (en) * | 2017-08-11 | 2017-10-20 | 广西大学 | Water rich strata Deep Foundation Pit of Metro Stations side wall waterproof construction and its construction method |
| CN110387886A (en) * | 2019-06-06 | 2019-10-29 | 广东宏骏建筑工程有限公司 | Civil air defense constructions and installations foundation pit supporting construction and its construction method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113653104A (en) * | 2021-08-25 | 2021-11-16 | 中国建筑第八工程局有限公司 | Waterproof structure at underground wall and construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111827303B (en) | 2021-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110159294B (en) | Construction method for lengthening open cut tunnel at tunnel junction section of high and steep terrain bridge | |
| CN207003499U (en) | A kind of anti-floating lifting device of underground tunnel upper excavation of foundation pit | |
| CN103938634B (en) | A kind of deep foundation pit supporting structure and construction method | |
| CN105862930A (en) | Protection structure on existing tunnel below new underground engineering | |
| CN104878835A (en) | Strip-shaped foundation house rear basement structure | |
| CN109403332B (en) | Method for combined excavation of layered bench sections of deep foundation pit of sandy cobble thick covering layer wide shallow valley | |
| CN113882390A (en) | Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method | |
| CN112211199A (en) | Large deep foundation pit supporting construction structure and method thereof | |
| CN112681374A (en) | Shallow-buried underground-excavated channel cover excavation top-down construction method under complex conditions | |
| CN106436730B (en) | A kind of masonry house concrete filled steel tube pillar support shock insulating foundation structure and construction method | |
| CN206396775U (en) | A kind of masonry house concrete filled steel tube pillar support shock insulating foundation structure | |
| CN110158602B (en) | Soft soil geological deep foundation pit supporting excavation construction structure and construction method | |
| CN111827303B (en) | Backfill-free foundation pit permanent support system and construction method thereof | |
| CN107326932B (en) | Quasi-semi-reverse construction method for underground garage | |
| CN209760299U (en) | light and shade of avoiding house to tear open and move is dug and is combined subway station structure | |
| CN216765941U (en) | Tunnel decompression load shedding structure under bias voltage state | |
| JP4226954B2 (en) | Underpinning method and viaduct | |
| CN113982004B (en) | Anchor cable-reinforced soil combined retaining member and construction method thereof | |
| CN217026767U (en) | Existing culvert structure is striden on open cut tunnel | |
| CN211447000U (en) | Foundation pit backfill area construction elevator foundation | |
| CN210141142U (en) | Underground structure is built in same direction as digging in hole stake secret | |
| CN117823170B (en) | Construction method for shallow tunnel downward-penetrating gully section | |
| CN111254938B (en) | Foundation pit supporting structure based on side wall of underground chamber and reverse construction method thereof | |
| CN113106979B (en) | Excavation method of upper cover foundation pit and construction method for upper cover storey addition | |
| CN111828051B (en) | Construction method of two-lining middle partition wall injection tunnel with support |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |