CN114263184A - Foundation pit supporting construction method - Google Patents
Foundation pit supporting construction method Download PDFInfo
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- CN114263184A CN114263184A CN202111098135.2A CN202111098135A CN114263184A CN 114263184 A CN114263184 A CN 114263184A CN 202111098135 A CN202111098135 A CN 202111098135A CN 114263184 A CN114263184 A CN 114263184A
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- 238000010276 construction Methods 0.000 title claims abstract description 38
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- 238000004080 punching Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention belongs to the technical field of construction of constructional engineering and discloses a foundation pit supporting construction method. The invention discloses a foundation pit supporting construction method, which comprises the following steps: measuring and setting out, drawing an excavation side line of the foundation pit, and excavating a first layer of earthwork of the foundation pit in layers; measuring the position of the anchor rod hole of the paying-off line, and performing punching construction on the anchor rod hole on the side wall of the foundation pit, wherein the anchor rod hole is obliquely and downwards arranged; arranging a retaining wall unit in the foundation pit, and connecting adjacent retaining wall units by using connecting pieces; after the retaining wall units are installed and connected, the anchor rods are driven into the anchor rod holes in the side wall of the foundation pit from the anchor rod holes of the retaining wall units, the end parts of the anchor rods are exposed out of the inner sides of the retaining wall units, and all the retaining wall units on the first layer are installed at one time; and excavating the rest earthwork of the foundation pit from top to bottom in sequence, and excavating a layer by utilizing the supporting mode until the foundation pit is supported. The foundation pit supporting construction method can not only ensure the stability of the foundation pit support, but also effectively improve the efficiency of the foundation pit retaining wall construction.
Description
Technical Field
The invention belongs to the technical field of construction of constructional engineering, and particularly relates to a foundation pit supporting construction method.
Background
The construction of deep foundation pits is generally met in the building construction, and a plurality of foundation pit supporting forms such as steel sheet piles, concrete piles, underground continuous walls and the like exist at the present stage. The supporting modes have advantages and have insufficient places, and most construction methods cannot be recycled. Nowadays, the assembly type is greatly developed, and the idea can also be adopted to promote the development of the construction method in the foundation pit construction.
Utility model patent No. CN202022206765.4 discloses a deep basal pit lateral wall supporting device for building engineering. This patent support position occupies too many volumes, and the workman operates inconvenience inside, does not have the connecting means with the foundation ditch side slope moreover, and stability is not enough.
The invention patent with the application number of CN201810932346.3 discloses an assembled deep foundation pit supporting structure and a construction method thereof, wherein a template is fixed by adopting an anchor rod mode, so that a support crossing a foundation pit does not need to be arranged or a supporting point does not need to be arranged inside the foundation pit, the influence on the construction of workers in the foundation pit can be avoided, but the problems that the supporting structure is difficult to assemble and disassemble and the like exist, particularly, the connecting pieces such as screw connection and the like easily rust, are inconvenient to assemble and disassemble, can be repeatedly utilized and the like exist in the environment in the foundation pit.
Disclosure of Invention
The invention aims to solve the technical problem of providing a foundation pit supporting construction method, which not only can ensure the stability of foundation pit supporting, but also can effectively improve the efficiency of foundation pit retaining wall construction.
The invention discloses a foundation pit supporting construction method, which comprises the following steps:
measuring and setting out, drawing an excavation side line of the foundation pit, and excavating a first layer of earthwork of the foundation pit in layers;
measuring the position of the anchor rod hole of the paying-off line, and performing punching construction on the anchor rod hole on the side wall of the foundation pit, wherein the anchor rod hole is obliquely and downwards arranged;
arranging a retaining wall unit in the foundation pit, wherein the inner side of the retaining wall unit is provided with a connecting clamping groove and an anchor rod hole which inclines downwards, adjusting the retaining wall unit to be accurate in place, aligning and coaxially arranging the anchor rod hole of the retaining wall unit and the anchor rod hole of the side wall of the foundation pit, connecting adjacent retaining wall units by using a connecting piece, wherein the connecting piece is provided with a connecting rod and clamping joints arranged at two ends of the connecting rod, and the connecting clamping joints at two ends of the connecting piece are respectively clamped into the connecting clamping grooves of the adjacent retaining wall units to realize the connection between the adjacent retaining wall units;
after the retaining wall units are installed and connected, the anchor rods are driven into the anchor rod holes in the side wall of the foundation pit from the anchor rod holes of the retaining wall units, the end parts of the anchor rods are exposed out of the inner sides of the retaining wall units, and all the retaining wall units on the first layer are installed at one time;
and excavating the rest earthwork of the foundation pit from top to bottom in sequence, and excavating a layer by utilizing the supporting mode until the foundation pit is supported.
Preferably, when the anchor rod hole is punched on the side wall of the foundation pit, the included angle between the anchor rod hole and the horizontal plane is 25-35 degrees.
Preferably, after the foundation pit supporting is finished, constructing an internal structure of the foundation pit;
after the construction of the internal structure of the foundation pit is completed, the dado unit begins to be dismantled, when the dado unit is dismantled, the anchor rod is firstly pulled out mechanically, cement slurry is filled in the anchor rod hole in the side wall of the foundation pit, and then the dado unit is dismantled after the connecting piece is taken down.
Preferably, when the retaining wall units are dismantled, the dismantling sequence is that the retaining wall units are dismantled layer by layer from bottom to top, the retaining wall unit on the next layer is dismantled firstly, and after the retaining wall unit on the previous layer is refilled on the next layer, the retaining wall unit on the previous layer is dismantled.
Preferably, the connecting clamping groove comprises a transverse clamping section and a vertical clamping section, the clamping section is communicated with the top of the clamping section, the clamping section comprises an opening formed in the inner surface of the retaining wall unit and a clamping cavity located on the inner side of the opening, the transverse section width of the clamping cavity is larger than that of the opening of the clamping section, the clamping connector is matched with the clamping cavity of the connecting clamping groove, and the transverse section width is larger than that of the opening of the connecting clamping groove and smaller than that of the clamping section of the connecting clamping groove;
when the connecting piece is used for connecting adjacent wall protection units, the clamping heads at two ends of the connecting piece are respectively clamped into the corresponding clamping sections through the clamping grooves of the connecting clamping grooves corresponding to the adjacent wall protection units, then the clamping heads are downwards moved to be clamped into the corresponding clamping cavities, and the connecting rod of the connecting piece penetrates through the openings of the corresponding clamping sections.
Preferably, the wall protection unit comprises a first corner wall protection unit and a second corner wall protection unit, the side edges of the first corner wall protection unit and the second corner wall protection unit are hinged, the connecting clamping groove comprises a corner connecting clamping groove, the first corner wall protection unit and the second corner wall protection unit are respectively provided with corresponding corner connecting clamping grooves, the connecting piece comprises a corner connecting piece, and the connecting rod of the corner connecting piece is of a straight-line structure;
when the retaining wall units are arranged, the first corner retaining wall unit and the second corner retaining wall unit are respectively arranged on two mutually perpendicular side walls at the corner of the foundation pit, so that the first corner retaining wall unit and the second corner retaining wall unit are mutually perpendicular, the clamping joints at two ends of the corner connecting piece are respectively clamped into the clamping sections of the corner connecting clamping grooves, and then the clamping joints are downwards moved and clamped into the corresponding clamping cavities, so that the first corner retaining wall unit and the second corner retaining wall unit are supported and connected.
Preferably, straight-edge connecting clamping grooves are formed in the inner walls of the first corner retaining wall unit and the second corner retaining wall unit far away from the hinged side, straight-edge connecting clamping grooves are formed in the adjacent retaining wall units of the first corner retaining wall unit far away from the hinged side and the adjacent retaining wall units of the second corner retaining wall unit far away from the hinged side, the connecting pieces comprise straight-edge connecting pieces, and connecting rods of the straight-edge connecting pieces are of C-shaped structures;
when the wall protection units are arranged, the first corner wall protection unit and the adjacent wall protection unit far away from the hinged side are clamped into the corresponding straight-edge connecting clamping groove through the straight-edge connecting piece to be connected, and the second corner wall protection unit and the adjacent wall protection unit far away from the hinged side are clamped into the corresponding straight-edge connecting clamping groove through the straight-edge connecting piece to be connected.
Preferably, the wall protection unit comprises a straight-edge middle wall protection unit, two sides of the straight-edge middle wall protection unit are respectively provided with a straight-edge connecting clamping groove, the connecting piece comprises a straight-edge connecting piece, and a connecting rod of the straight-edge connecting piece is of a C-shaped structure;
when the wall protection units are arranged, the straight-side middle wall protection unit is clamped into the corresponding straight-side connecting clamping groove through the straight-side connecting piece to be connected with the adjacent wall protection unit.
Preferably, the upper and lower parts of the connecting slot of the wall protection unit are respectively clamped with a connecting piece, a supporting piece is arranged between the upper and lower connecting pieces, the upper and lower ends of the supporting piece are respectively provided with a bayonet,
when the retaining wall unit is arranged, the upper and lower ends of the supporting piece are respectively clamped with the upper and lower connecting pieces through the bayonets.
Preferably, the anchor rod hole on the retaining wall unit is positioned in the middle of the retaining wall unit and positioned between the connecting clamping grooves on the two sides.
The invention has the beneficial effects that:
1. convenient installation and disassembly and rapid construction progress
The wall protection unit is formed by directly adopting the modularization idea to pile without concrete construction, the wall protection unit is clamped and connected through the connecting piece, the installation process is simple, the construction progress is faster, components including the anchor rod do not need to be fixed by members such as bolts, and the number of material components is small.
2. Controllable cost
The wall protection device adopted by the invention can be recycled, is relatively environment-friendly, has extremely high material recovery rate and reutilization rate due to no small parts such as bolts and the like, can reduce material consumption and reduce construction cost.
3. Good wall protection effect
The retaining wall has good effect, and particularly, after the connecting piece is connected up and down by the supporting piece, the connecting piece and the retaining wall unit can form a stable whole, and the anchor rod is driven into the side wall of the foundation pit to be firmly locked with the foundation pit.
4. Has high safety
The construction process is simple, the processes of layered excavation, layered wall protection and the like are compactly connected, the risk of collapse and the like of the foundation pit is not easy to occur, and the safety is relatively high.
5. The construction in the foundation pit is convenient.
The inboard bracing point that need not to set up of foundation ditch or span the support component of foundation ditch, the connecting piece occupies that the foundation ditch inner space is little, is favorable to the construction operation in the foundation ditch.
Drawings
Figure 1 is a schematic perspective view of an excavation supporting apparatus;
figure 2 is a top plan view of the excavation supporting apparatus;
FIG. 3 is an attached perspective view of the corner retaining wall unit;
FIG. 4 is a top view of the connection of the corner retaining wall units;
FIG. 5 is an exploded schematic view of a corner retaining wall unit;
FIG. 6 is a schematic view of the connection of the corner connector to the support member;
fig. 7 is a schematic view of the connection of the straight-sided connecting member to the supporting member.
Reference numerals: the connecting structure comprises a first corner wall protection unit 11, a first hinged sleeve 111, a first convex block 112, a first positioning groove 113, a second corner wall protection unit 12, a second hinged sleeve 121, a second convex block 122, a second positioning groove 123, a corner connecting clamping groove 21, a straight-edge connecting clamping groove 22, a clamping section 201, a clamping section 202, a corner connecting piece 31, a straight-edge connecting piece 32, a clamping joint 301, a connecting rod 302, a supporting piece 4, an anchor rod 5, an anchor rod hole 51 and a hinge shaft 6.
Detailed Description
The present invention is further described below.
The invention discloses a foundation pit supporting construction method, which comprises the following steps:
measuring and setting out, drawing an excavation side line of the foundation pit, and excavating a first layer of earthwork of the foundation pit in layers; before excavation of the foundation pit, precipitation construction is usually required, and excavation of the foundation pit is carried out after precipitation is finished;
measuring the position of the anchor rod hole 51, and performing punching construction on the anchor rod hole 51 on the side wall of the foundation pit, wherein the anchor rod hole 51 is obliquely and downwards arranged; the foundation pit side wall anchor rod hole 51 is consistent with the inclination and the size of the anchor rod hole 51 on the wall protection unit in subsequent construction according to requirements. The angle between the anchor eye 51 and the horizontal is preferably 25 to 35, most preferably 30.
Arranging a retaining wall unit in the foundation pit, wherein the inner side of the retaining wall unit is provided with a connecting clamping groove and an anchor rod hole 51 which inclines downwards, adjusting the retaining wall unit to be accurate in place, aligning and coaxially arranging the anchor rod hole 51 of the retaining wall unit and the anchor rod hole 51 of the side wall of the foundation pit, connecting adjacent retaining wall units by using a connecting piece, wherein the connecting piece is provided with a connecting rod 302 and clamping joints 301 arranged at two ends of the connecting rod 302, and realizing the connection between the adjacent retaining wall units by respectively clamping the clamping joints 301 at two ends of the connecting piece into the connecting clamping grooves of the adjacent retaining wall units; the wall protection unit and the connecting piece are both pre-processed and manufactured, and can be repeatedly used. The two sides of the retaining wall unit are generally provided with adjacent retaining wall units, so that the two sides of the retaining wall unit can be respectively provided with connecting clamping grooves for connection, and in order to ensure that the force of the retaining wall unit is balanced, the anchor rod hole 51 on the retaining wall unit is positioned in the middle of the retaining wall unit and positioned between the connecting clamping grooves on the two sides.
After the retaining wall units are installed and connected, the anchor rods 5 are driven into the anchor rod holes 51 of the side walls of the foundation pit from the anchor rod holes 51 of the retaining wall units, the end parts of the anchor rods 5 are exposed out of the inner sides of the retaining wall units, and all the retaining wall units on the first layer are installed at one time; the exposed length of the end of the anchor rod 5 is preferably about 100 mm.
The foundation pit supporting device is convenient to mount and dismount, and after foundation pit supporting is completed, construction of an internal structure of a foundation pit is carried out; after the construction of the internal structure of the foundation pit is completed, the dado unit begins to be dismantled, when the dado unit is dismantled, the anchor rod 5 is firstly pulled out mechanically, cement slurry is filled in the anchor rod hole 51 of the side wall of the foundation pit, and then the dado unit is dismantled after the connecting piece is taken down. Because the anchor rod 5 is installed after drilling, the anchor rod can be pulled out easily, and the anchor rod can be pulled out by adopting a hydraulic device or a hoisting device generally. The anchor rod hole 51 is filled with cement paste to block the hole, and then the retaining wall unit is taken down. Most of the disassembled parts can be reused.
In order to keep the foundation pit stable, when the retaining wall units are dismantled, the dismantling sequence is preferably that the retaining wall units are dismantled layer by layer from bottom to top, the retaining wall unit on the next layer is dismantled first, and after the retaining wall unit on the next layer is backfilled, the retaining wall unit on the previous layer is dismantled. And after the one-layer retaining wall unit is removed, the one-layer retaining wall unit is backfilled, so that the side wall of the foundation pit can be prevented from collapsing after the retaining wall unit is removed.
The connection between the retaining wall units of the foundation pit supporting device utilizes the clamping form of the connecting clamping groove matched with the connecting piece, and as for the specific structures of the connecting clamping groove and the connecting piece, in the preferred embodiment of the application, the connecting clamping groove comprises a transverse clamping section 201 and a vertical clamping section 202, the clamping section 201 is communicated with the top of the clamping section 202, the clamping section 202 comprises an opening formed in the inner surface of the retaining wall unit and a clamping cavity positioned on the inner side of the opening, the transverse section width of the clamping cavity is greater than the transverse section width of the opening of the clamping section 202, the clamping connector 301 is matched with the clamping cavity of the connecting clamping groove, and the transverse section width is greater than the transverse section width of the opening of the connecting clamping groove and less than the transverse section width of the clamping section 201 of the connecting clamping groove; when the connecting piece is used for connecting adjacent wall protection units, the clamping joints 301 at two ends of the connecting piece are respectively clamped into the clamping sections 201 through the clamping grooves corresponding to the adjacent wall protection units, then the clamping joints are downwards moved to be clamped into the corresponding clamping cavities, and the connecting rod 302 of the connecting piece penetrates through the opening corresponding to the clamping section 202. The connecting piece of the foundation pit supporting device is clamped into the clamping section 202 from the transverse clamping section 201 of the connecting clamping groove and then keeps connected, so that the clamping operation is convenient, the end part of the connecting clamping groove is of a closed structure, the influence of sundries entering on the disassembly and the assembly is reduced, and the strength of the retaining wall unit can be greatly improved.
The retaining wall units can be arranged according to a conventional arrangement mode, for the corner position of the foundation pit, in order to ensure the stability of the retaining and protecting of the foundation pit, in a preferred embodiment of the application, the retaining wall unit comprises a first corner retaining wall unit 11 and a second corner retaining wall unit 12, the side edges of the first corner retaining wall unit 11 and the second corner retaining wall unit 12 are hinged, the connecting slot comprises a corner connecting slot 21, the first corner retaining wall unit 11 and the second corner retaining wall unit 12 are respectively provided with corresponding corner connecting slots 21, the connecting piece comprises a corner connecting piece 31, and a connecting rod 302 of the corner connecting piece 31 is in a straight-line structure; when the retaining wall units are arranged, the first corner retaining wall unit 11 and the second corner retaining wall unit 12 are respectively arranged on two mutually perpendicular side walls at the corner of the foundation pit, so that the first corner retaining wall unit 11 and the second corner retaining wall unit 12 are mutually perpendicular, the clamping joints 301 at two ends of the corner connecting piece 31 are respectively clamped into the clamping sections 201 of the corner connecting clamping grooves 21, and then the clamping joints are downwards moved and clamped into corresponding clamping cavities, so that the first corner retaining wall unit 11 and the second corner retaining wall unit 12 are supported and connected.
The corner connector 31 here is one of the connectors having the basic structure and function of the connector described above, as well as the first corner retaining wall unit 11 and the second corner retaining wall unit 12 are one of the retaining wall units having the basic structure and function of the retaining wall units described above, and the corner connecting card slot 21 is also one of the connecting card slots described above. When the wall is arranged, the first corner retaining wall unit 11 and the second corner retaining wall unit 12 are usually closely attached to the edge of the foundation pit at an angle of 90 degrees, and due to the hinged relation of the first corner retaining wall unit 11 and the second corner retaining wall unit 12, the positions of the two corner retaining wall units are not easy to be dislocated. The corner connector 31 may also function as a support in addition to a connection function to hold the first corner retaining wall element 11 and the second corner retaining wall element 12 at 90 °, and therefore, the connecting rod 302 of the corner connector 31 is preferably of a straight-line configuration to ensure a support effect, although other configurations may be used. The snap-in section 201 of the corner connector pocket 21 may be suitably elongated to facilitate the snap-in of the corner connector 31.
The connection between the first corner retaining wall element 11 and the second corner retaining wall element 12 utilizes a corner connecting snap groove 21 and a corner connecting piece 31, which are different from the connection in the straight edge direction. As shown in fig. 1, straight-edge connecting slots 22 are formed in inner walls of the first corner retaining wall unit 11 and the second corner retaining wall unit 12 away from the hinge side, straight-edge connecting slots 22 are formed in adjacent retaining wall units of the first corner retaining wall unit 11 away from the hinge side and adjacent retaining wall units of the second corner retaining wall unit 12 away from the hinge side, the connecting members include straight-edge connecting members 32, and connecting rods 302 of the straight-edge connecting members 32 are C-shaped structures; when the wall protection units are arranged, the first corner wall protection unit 11 and the adjacent wall protection unit far away from the hinged side are clamped into the corresponding straight-edge connecting clamping groove 22 through the straight-edge connecting piece 32 to be connected, and the second corner wall protection unit 12 and the adjacent wall protection unit far away from the hinged side are clamped into the corresponding straight-edge connecting clamping groove 22 through the straight-edge connecting piece 32 to be connected. The straight-edge connecting clamping groove 22 is one of the connecting clamping grooves, the straight-edge connecting piece 32 is one of the connecting pieces, the straight-edge direction of the corner wall protection unit is connected with the adjacent wall protection unit through the straight-edge connecting clamping groove 22 and the straight-edge connecting piece 32, and the connecting principle is the same as that in the previous embodiment. The connecting rod 302 of the straight-edge connecting member 32 is preferably of a C-shaped structure, and may have other structural forms such as a frame structure.
The hinge connection between the first corner dado unit 11 and the second corner dado unit 12 can refer to the existing hinge connection, in the preferred embodiment of the present application, the lower part of the hinge side of the first corner dado unit 11 is provided with a first hinge sleeve 111, the upper part of the hinge side of the second corner dado unit 12 is provided with a second hinge sleeve 121, and the first hinge sleeve 111 and the second hinge sleeve 121 are provided with a hinge shaft 6 to form the hinge connection. The connection and the disassembly are very convenient, and during the installation, the first corner dado unit 11 with the first hinge sleeve 111 at the lower part is firstly installed, then the hinge shaft 6 is inserted, and then the second hinge sleeve 121 of the second corner dado unit 12 is sleeved.
In order to reduce the acting force borne by the hinge shaft 6, the side surface of the first corner retaining wall unit 11 connected with the second corner retaining wall unit 12 is provided with a positioning structure, and the positioning structure comprises a first projection 112 arranged on the side surface of the first corner retaining wall unit 11, a second projection 122 arranged on the side surface of the second corner retaining wall unit 12, a first positioning groove 113 arranged on the side surface of the first corner retaining wall unit 11 and a second positioning groove 123 arranged on the side surface of the second corner retaining wall unit 12; the first protrusion 112 of the first corner retaining wall unit 11 is positioned in the second positioning groove 123 of the side of the second corner retaining wall unit 12, and the second protrusion 122 of the second corner retaining wall unit 12 is positioned in the first positioning groove 113 of the first corner retaining wall unit 11. The engagement of the projection with the detent prevents misalignment between the first corner retaining wall element 11 and the second corner retaining wall element 12 and also reduces the unbalanced force experienced by the hinge shaft 6.
In the embodiment shown in the figure, the size of the foundation pit is small, so that the supporting can be realized only by utilizing the corner retaining wall units, if the size of the foundation pit is large, straight-edge middle retaining wall units are required to be arranged between the corner retaining wall units, two sides of each straight-edge middle retaining wall unit are provided with straight-edge connecting clamping grooves 22, each connecting piece comprises a straight-edge connecting piece 32, and the connecting rod 302 of each straight-edge connecting piece 32 is of a C-shaped structure; when the wall protection units are arranged, the straight-side middle wall protection unit is clamped into the corresponding straight-side connecting clamping groove 22 through the straight-side connecting piece 32 to be connected with the adjacent wall protection unit. The adjacent ones of the straight-edge intermediate retaining wall elements may be corner retaining wall elements or other straight-edge intermediate retaining wall elements, depending on the specific location. The connection between the straight-edge intermediate retaining wall unit and the adjacent retaining wall unit, and the connection between the corner retaining wall unit and the adjacent retaining wall unit in the straight-edge direction, can adopt the same connection structure, namely, the way of matching the straight-edge connecting clamping groove 22 and the straight-edge connecting piece 32. Here, the straight-edge connector 32 is preferably a C-shaped connector 302, and may be of other configurations such as a frame structure.
Can only set up the one deck connecting piece between two adjacent dado units, also can press and set up two-layer at least connecting piece on the direction of height, to the connection of multilayer connecting piece, can independently set up the draw-in groove to every connecting piece, nevertheless this kind sets up mode processing comparatively complicated undoubtedly, in the preferred embodiment of this application, the upper and lower difference joint of the draw-in groove of dado unit has the connecting piece, be provided with support piece 4 between the upper and lower connecting piece, support piece 4's upper and lower both ends are provided with the bayonet socket respectively to through the bayonet socket respectively with upper and lower connecting piece looks joint. So, can set up two or more connecting pieces even in same connecting slot, connect through support piece 4 between the connecting piece, support piece 4 not only can stabilize the position of upper portion connecting piece, can also connect as an organic whole each connecting piece, reinforcing wholeness. The supporting piece 4 is connected with the connecting piece through a bayonet, and the connecting mode is simple and easy to assemble and disassemble. As shown in fig. 6 and 7, the support members 4 may be provided at positions near both ends of the aforementioned in-line corner connector 31, and the support members 4 may be provided at three sides of the aforementioned C-shaped straight-side connector 32.
Claims (10)
1. The foundation pit supporting construction method is characterized by comprising the following steps:
measuring and setting out, drawing an excavation side line of the foundation pit, and excavating a first layer of earthwork of the foundation pit in layers;
measuring the position of the anchor rod hole (51) which is paid out, performing punching construction of the anchor rod hole (51) on the side wall of the foundation pit, and arranging the anchor rod hole (51) in an inclined and downward manner;
arranging a retaining wall unit in the foundation pit, wherein the inner side of the retaining wall unit is provided with a connecting clamping groove and an anchor rod hole (51) which inclines downwards, adjusting the retaining wall unit to be accurate in place, aligning and coaxially arranging the anchor rod hole (51) of the retaining wall unit and the anchor rod hole (51) of the side wall of the foundation pit, connecting adjacent retaining wall units by using a connecting piece, wherein the connecting piece is provided with a connecting rod (302) and clamping joints (301) arranged at two ends of the connecting rod (302), and respectively clamping the clamping joints (301) at two ends of the connecting piece into the connecting clamping grooves of the adjacent retaining wall units to realize the connection between the adjacent retaining wall units;
after the retaining wall units are installed and connected, an anchor rod (5) is driven into an anchor rod hole (51) of the side wall of the foundation pit from an anchor rod hole (51) of the retaining wall unit, the end part of the anchor rod (5) is exposed out of the inner side of the retaining wall unit, and all the retaining wall units on the first layer are installed at one time;
and excavating the rest earthwork of the foundation pit from top to bottom in sequence, and excavating a layer by utilizing the supporting mode until the foundation pit is supported.
2. A method of retaining and retaining a foundation according to claim 1, wherein: when the anchor rod hole (51) is punched on the side wall of the foundation pit, the included angle between the anchor rod hole (51) and the horizontal plane is 25-35 degrees.
3. A method of retaining and retaining a foundation according to claim 1, wherein: after the foundation pit supporting is finished, constructing an internal structure of the foundation pit;
after the construction of the internal structure of the foundation pit is completed, the dado unit begins to be dismantled, when the dado unit is dismantled, the anchor rod (5) is pulled out mechanically, cement slurry is filled in the anchor rod hole (51) of the side wall of the foundation pit, and then the dado unit is dismantled after the connecting piece is taken down.
4. A method of retaining and retaining a foundation according to claim 3, wherein: when the retaining wall units are dismantled, the dismantling sequence is that the retaining wall units are dismantled layer by layer from bottom to top, the next layer of retaining wall unit is dismantled first, and after the next layer is backfilled, the retaining wall unit on the previous layer is dismantled.
5. A method of retaining and retaining a foundation according to claim 1, wherein: the connecting clamping groove comprises a transverse clamping section (201) and a vertical clamping section (202), the clamping section (201) is communicated with the top of the clamping section (202), the clamping section (202) comprises an opening formed in the inner surface of the retaining wall unit and a clamping cavity located on the inner side of the opening, the transverse section width of the clamping cavity is larger than that of the opening of the clamping section (202), the clamping connector (301) is matched with the clamping cavity of the connecting clamping groove, and the transverse section width is larger than that of the opening of the connecting clamping groove and smaller than that of the clamping section (201) of the connecting clamping groove;
when the connecting piece is used for connecting adjacent wall protection units, clamping heads (301) at two ends of the connecting piece are clamped into the corresponding clamping cavities through clamping sections (201) of connecting clamping grooves corresponding to the adjacent wall protection units respectively, then the clamping heads are moved downwards to be clamped into the corresponding clamping cavities, and connecting rods (302) of the connecting piece penetrate through openings of the corresponding clamping sections (202).
6. A method of retaining and retaining a foundation according to claim 5, wherein: the wall protection unit comprises a first corner wall protection unit (11) and a second corner wall protection unit (12), the side edges of the first corner wall protection unit (11) and the second corner wall protection unit (12) are hinged, the connecting clamping groove comprises a corner connecting clamping groove (21), the first corner wall protection unit (11) and the second corner wall protection unit (12) are respectively provided with corresponding corner connecting clamping grooves (21), the connecting piece comprises a corner connecting piece (31), and a connecting rod (302) of the corner connecting piece (31) is of a straight-line structure;
when the retaining wall units are arranged, the first corner retaining wall unit (11) and the second corner retaining wall unit (12) are respectively arranged on two mutually perpendicular side walls at the corner of the foundation pit, so that the first corner retaining wall unit (11) and the second corner retaining wall unit (12) are mutually perpendicular, the clamping joints (301) at two ends of the corner connecting piece (31) are respectively clamped into the clamping sections (201) of the corner connecting clamping grooves (21), and then the clamping joints are downwards moved and clamped into corresponding clamping cavities, so that the first corner retaining wall unit (11) and the second corner retaining wall unit (12) are supported and connected.
7. A method of retaining and retaining a foundation according to claim 6, wherein: straight-edge connecting clamping grooves (22) are formed in the inner walls, far away from the hinged side, of the first corner retaining wall unit (11) and the second corner retaining wall unit (12), straight-edge connecting clamping grooves (22) are formed in the adjacent retaining wall units, far away from the hinged side, of the first corner retaining wall unit (11) and the adjacent retaining wall units, far away from the hinged side, of the second corner retaining wall unit (12), the connecting pieces comprise straight-edge connecting pieces (32), and connecting rods (302) of the straight-edge connecting pieces (32) are of C-shaped structures;
when the wall protection units are arranged, the first corner wall protection unit (11) and the adjacent wall protection unit far away from the hinged side are clamped into the corresponding straight-edge connecting clamping groove (22) through the straight-edge connecting piece (32) to be connected, and the second corner wall protection unit (12) and the adjacent wall protection unit far away from the hinged side are clamped into the corresponding straight-edge connecting clamping groove (22) through the straight-edge connecting piece (32) to be connected.
8. A method of retaining and retaining a foundation according to claim 5, wherein: the wall protection unit comprises a straight-edge middle wall protection unit, two sides of the straight-edge middle wall protection unit are respectively provided with a straight-edge connecting clamping groove (22), the connecting piece comprises a straight-edge connecting piece (32), and a connecting rod (302) of the straight-edge connecting piece (32) is of a C-shaped structure;
when the wall protection units are arranged, the straight-side middle wall protection unit is clamped into the corresponding straight-side connecting clamping groove (22) through the straight-side connecting piece (32) to be connected with the adjacent wall protection unit.
9. A foundation pit supporting construction method according to claim 5, 6, 7 or 8, wherein: the upper part and the lower part of the connecting clamping groove of the wall protection unit are respectively clamped with a connecting piece, a supporting piece (4) is arranged between the upper connecting piece and the lower connecting piece, the upper end and the lower end of the supporting piece (4) are respectively provided with a clamping opening,
when the wall protection unit is arranged, the upper end and the lower end of the support piece (4) are respectively clamped with the upper connecting piece and the lower connecting piece through bayonets.
10. A method of retaining and retaining a foundation according to claim 1, wherein: and an anchor rod hole (51) on the wall protection unit is positioned in the middle of the wall protection unit and positioned between the connecting clamping grooves on the two sides.
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