CN216999738U - Combined prefabricated dado square pile foundation pit supporting structure - Google Patents
Combined prefabricated dado square pile foundation pit supporting structure Download PDFInfo
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- CN216999738U CN216999738U CN202120982339.1U CN202120982339U CN216999738U CN 216999738 U CN216999738 U CN 216999738U CN 202120982339 U CN202120982339 U CN 202120982339U CN 216999738 U CN216999738 U CN 216999738U
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Abstract
The utility model discloses a combined prefabricated dado square pile foundation pit supporting structure which is characterized in that a water-stopping and soil-retaining integrated underground dado is formed by constructing a mixing pile, a prefabricated pile, a connecting steel member, an externally-hung steel member and micro-expansion concrete, so that the supporting stability is provided for a foundation pit, and the foundation pit can be rapidly and safely excavated in the shielding range of the underground dado; moreover, the external hanging part of the external hanging steel member is used for hanging the lining wall of the basement externally, so that a fertilizer groove required by the lining wall of the basement during conventional construction can be eliminated, excavation and filling of a foundation pit are reduced, the using area of the basement is enlarged, the embedded ribs of the lining wall of the basement can be reduced or even eliminated, the underground retaining wall can be used as a permanent structure without being dismantled, the underground retaining wall can be used as an outer wall of the basement at both the construction stage and the using stage, and the engineering cost is remarkably saved; the utility model has the advantages of safety, short construction period and low construction cost.
Description
Technical Field
The utility model relates to foundation pit supporting, in particular to a combined prefabricated dado square pile foundation pit supporting structure.
Background
The foundation pit support is a retaining, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit. The vertical supporting member in the conventional foundation pit supporting mode mainly comprises a row pile support, a ground connecting wall, a tubular pile, a slope placing pile and a construction method pile; the horizontal supporting component comprises a concrete support, a steel support, an anchor cable 6, a soil nail and the like. One foundation pit supporting form can be one or more supporting forms. During excavation of the foundation pit, underground water control also belongs to a part of foundation pit support, and the underground water control method can be divided into open drainage for water collection, precipitation, water interception, recharge and the like for independent or combined use.
Urban land is tightened due to urban development, and numerous foundation pits emerge from urban construction for developing and utilizing land resources as much as possible. The conventional foundation pit support has the following common defects:
firstly, the foundation pit support generally belongs to a temporary structure, needs to be set back for a certain distance to meet the requirement of the construction of the side wall of the basement 1, so that the land utilization is wasted, the area of the basement 1 is reduced, and the digging and filling cost of the fertilizing groove is increased.
Secondly, the existing foundation pit supporting construction is mostly carried out on site concrete pouring, so that various common defects of the concrete on site pouring can be caused, and corresponding detection needs to be completed, so that resource waste is caused, and the construction period is delayed.
Thirdly, numerous city management regulations specify that the horizontal members of the foundation pit support are prohibited from producing red lines, so that the anchor cables are severely limited in the use of the foundation pit, and the support cost is increased by virtue of empty space after the anchor cables are adjusted to other support members.
At present, the design and construction of foundation pit support are relatively extensive, noise pollution exists on site, slurry and waste water do not meet the requirements of high-quality development and environmental protection advocated by China.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: a combined prefabricated dado square pile foundation pit supporting structure is provided.
The technical scheme adopted by the utility model is as follows:
the utility model provides a combination prefabricated dado square pile foundation ditch supporting construction which characterized in that includes: a stirring pile ring belt formed by connecting a plurality of groups of stirring piles; a plurality of precast piles are vertically inserted into the mixing pile ring belt to form a precast pile ring belt extending along the mixing pile ring belt; a steel member is pressed between two adjacent precast piles and is filled with micro-expansion concrete, so that the precast pile annuluses are connected to form an underground retaining wall, wherein the steel member comprises a connecting steel member and an externally-hanging steel member which can both play a role in connecting the precast piles, and the externally-hanging steel member is provided with an externally-hanging part extending out of the inner side surface of the precast pile annuluses; and a basement is arranged in a foundation pit constructed in the enclosing range of the underground retaining wall, the external hanging part of the external hanging steel member is hung with the steel bars of the lining wall of the basement and is buried in the concrete of the lining wall, wherein before the basement construction, the inner side surface of the underground retaining wall is subjected to surface cement and soil removal and net hanging and concrete spraying construction, so that the external hanging part of the external hanging steel member is exposed in the foundation pit.
Therefore, the water-stopping and soil-retaining integrated underground retaining wall is formed by constructing the mixing pile, the precast pile, the connecting steel member, the externally-hung steel member and the micro-expansion concrete, so that the support stability is provided for the foundation pit, and the foundation pit can be quickly and safely excavated in the enclosing and shielding range of the underground retaining wall;
moreover, the external hanging part of the external hanging steel member is used for hanging the lining wall of the basement externally, so that a fertilizer groove required by the lining wall of the basement during conventional construction can be eliminated, the excavation and filling of a foundation pit are reduced, the use area of the basement is enlarged, the steel bars for the lining wall of the basement can be reduced and even eliminated, the underground retaining wall can be used as a permanent structure, the underground retaining wall does not need to be dismantled, the underground retaining wall can be used as the outer wall of the basement at both the construction stage and the use stage, and the construction cost is obviously saved;
therefore, the method is suitable for the foundation pit supporting engineering which has the advantages of limited supporting structure land, narrow foundation pit construction range, short construction period requirement, requirement that the basement is tightly attached to the supporting side line of the foundation pit, strict control requirement of the surrounding environment and limitation of the horizontal component of the foundation pit supporting to be exposed to the red line, and has the advantages of safety, short construction period and low engineering cost.
Preferably: the combined prefabricated dado square pile foundation pit supporting structure is connected with a stirring pile sub-belt formed by connecting a plurality of groups of stirring piles corresponding to the position of each externally hung steel member, and each stirring pile sub-belt is vertically connected to the outer side surface of the stirring pile ring belt; at least one precast pile is inserted into each stirring pile sub-belt to form a precast pile sub-belt vertically connected with the outer side surface of the precast pile annular belt; and the stirring pile sub-belts and the externally hung steel members are preferably uniformly arranged at intervals along the extension direction of the stirring pile annular belt.
The external steel member still has the connecting portion that stretches out precast pile clitellum lateral surface, and the connecting portion of this external steel member pass through the little expanded concrete and connect the precast pile who links to each other with the precast pile clitellum in the precast pile subband to, adjacent two forming the precast pile subband have impressed the subband between the precast pile and connect the steel member and fill little expanded concrete, so that the precast pile subband is connected and is formed the side direction knee wall.
Therefore, the utility model forms the multi-surface lateral supporting wall by constructing the mixing pile, the precast pile, the subband connecting steel member and the micro-expansion concrete, so that each lateral supporting wall is connected with the underground retaining wall to form a T-shaped structure to limit the lateral displacement of the soil body in a certain range outside the foundation pit, fully mobilizes the gravity of the soil body around the periphery of the foundation pit to realize the self-stabilization of the soil body, improves the stability of the supporting structure, is beneficial to controlling the displacement of the foundation pit and realizes the economical efficiency of the foundation pit support.
As a preferred embodiment of the present invention: precast pile clitellum, precast pile subband, little expanded concrete, connecting steel member, external steel member and subband connect the connected mode between the steel member, preferably adopt one of following three kinds of schemes:
in a first scheme, referring to fig. 2 to 6, the precast pile has a rectangular cross section and is divided into a double-groove precast pile and a single-groove precast pile, the double-groove precast pile is symmetrically provided with double rows of grooves extending along the axial direction of the double-groove precast pile on two opposite side surfaces of the double-groove precast pile, and the single-groove precast pile is symmetrically provided with single rows of grooves extending along the axial direction of the single-groove precast pile on two opposite side surfaces of the single-groove precast pile;
the prefabricated pile girdle is formed by adopting the double-groove prefabricated pile, and the prefabricated pile sub-girdle is formed by adopting the single-groove prefabricated pile; at the connecting steel member, two rows of grooves of two adjacent double-groove precast piles are connected to form two filling holes, the connecting steel member is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and micro-expansion concrete is filled in the two filling holes; at the position of the external steel member, a gap is reserved between two adjacent double-groove precast piles, double-row grooves of the two double-groove precast piles are communicated with a single-row groove of a single-groove precast pile in the precast pile sub-belt through the gap to form a special-shaped filling hole, the external steel member is two transverse H-shaped steels, one end parts of the two H-shaped steels are inserted into the double-row grooves, the other end parts of the two H-shaped steels are respectively used as an external hanging part and a connecting part of the external steel member, and micro-expansion concrete is filled in the special-shaped filling hole; at the position of the auxiliary belt connecting steel member, the single-row grooves of two adjacent single-groove precast piles are connected to form a filling hole, and the auxiliary belt connecting steel member is an I-shaped steel which is inserted into the filling hole and is transversely arranged;
here, the longitudinal direction described herein refers to the vertical direction in the drawings of fig. 2, 7, and 8, and the lateral direction described herein refers to the horizontal direction in the drawings of fig. 2, 7, and 8.
Secondly, referring to fig. 5 to 7, the precast pile has a rectangular cross section and is divided into a double-groove precast pile and a single-groove precast pile, the double-groove precast pile is symmetrically provided with double-row grooves extending along the axial direction of the double-groove precast pile on two opposite side surfaces of the double-groove precast pile, and the single-groove precast pile is symmetrically provided with single-row grooves extending along the axial direction of the single-groove precast pile on two opposite side surfaces of the single-groove precast pile;
the prefabricated pile girdle is formed by adopting the double-groove prefabricated pile, and the prefabricated pile sub-girdle is formed by adopting the single-groove prefabricated pile; at the connecting steel member, the double-row grooves of two adjacent double-groove precast piles are connected to form two filling holes, the connecting steel member is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and micro-expansion concrete is filled in the two filling holes; at the external steel member, a gap is reserved between two adjacent double-groove precast piles, double-row grooves of the two double-groove precast piles are communicated with a single-row groove of a single-groove precast pile in the precast pile sub-belt through the gap to form a special-shaped filling hole, the external steel member is an I-shaped steel, a web plate of the I-shaped steel is provided with two rib plates and is transversely arranged, the two rib plates of the I-shaped steel are inserted into the double-row grooves, two end parts of the I-shaped steel are respectively used as an external hanging part and a connecting part of the external steel member, and micro-expansion concrete is filled in the special-shaped filling hole; at the position of the auxiliary belt connecting steel member, the single-row grooves of two adjacent single-groove precast piles are connected to form a filling hole, and the auxiliary belt connecting steel member is an I-shaped steel which is inserted into the filling hole and is transversely arranged;
thirdly, referring to fig. 6 and 8, the precast pile is a single-groove precast pile with a rectangular cross section, and the single-groove precast pile is symmetrically provided with single-row grooves extending along the axial direction of the single-groove precast pile on two opposite side surfaces of the single-groove precast pile;
at the connecting steel member, the single-row grooves of two adjacent single-groove precast piles are connected to form a filling hole, the connecting steel member is an I-shaped steel which is inserted into the filling hole and is longitudinally arranged, and micro-expansion concrete is filled in the filling hole; at the external steel member, a gap is reserved between two adjacent single-groove precast piles, single-row grooves of the two single-groove precast piles are communicated with single-row grooves of the single-groove precast piles in the precast pile sub-belt through the gap to form a special-shaped filling hole, the external steel member is an I-shaped steel, a web plate of the I-shaped steel is provided with a rib plate, the I-shaped steel is transversely arranged, the rib plate of the I-shaped steel is inserted into the single-row grooves, two end parts of the I-shaped steel are respectively used as an external hanging part and a connecting part of the external steel member, and micro-expansion concrete is filled in the special-shaped filling hole; the steel member department is connected to the subband, and the single-row groove connection of two adjacent single flute precast piles constitutes a filling hole, the steel member is a I-steel that inserts in this filling hole and transverse arrangement for the subband.
Preferably, the following components: the precast pile is provided with a central hole extending along the axial direction of the precast pile so as to reduce the weight of the precast pile and facilitate transportation; the top of the central hole is filled with micro-expansion concrete, and the filling depth is generally 2 m.
As a preferred embodiment of the present invention: the top of the underground retaining wall is provided with a crown beam, the top of the lateral supporting wall is provided with a connecting beam, wherein the crown beam and the connecting beam are both reinforced concrete beams, and the steel bars of the crown beam and the connecting beam are lapped with the steel bars of corresponding precast piles;
the top surface of the connecting beam is provided with a wedge-shaped anchor backing plate, the wedge-shaped anchor backing plate is provided with an inclined surface which inclines inwards, the combined prefabricated dado square pile foundation pit supporting structure is stretched with a prestressed anchor cable, the upper end of the prestressed anchor cable is locked on the inclined surface of the wedge-shaped anchor backing plate, and the lower end of the prestressed anchor cable is anchored in an underground soil body.
Therefore, the utility model further transfers the gravity of the soil around the periphery of the foundation pit to realize the self-stabilization of the soil and control the displacement of the foundation pit by arranging the prestressed anchor cables, improves the rigidity and the anti-overturning capability of the supporting structure, avoids the prestressed anchor cables from generating red lines, and realizes the green and environment-friendly excavation of the foundation pit.
Compared with the prior art, the utility model has the following beneficial effects:
firstly, the water-stopping and soil-retaining integrated underground retaining wall is formed by constructing the mixing pile, the precast pile, the connecting steel member, the externally-hung steel member and the micro-expansion concrete, so that the support stability is provided for the foundation pit, and the foundation pit can be quickly and safely excavated in the shielding range of the underground retaining wall;
moreover, the external hanging part of the external hanging steel member is used for hanging the lining wall of the basement externally, so that a fertilizer groove required by the lining wall of the basement during conventional construction can be eliminated, excavation and filling of a foundation pit are reduced, the using area of the basement is enlarged, the embedded ribs of the lining wall of the basement can be reduced or even eliminated, the underground retaining wall can be used as a permanent structure without being dismantled, the underground retaining wall can be used as an outer wall of the basement at both the construction stage and the using stage, and the engineering cost is remarkably saved;
therefore, the method is suitable for the foundation pit supporting engineering which has the advantages of limited supporting structure land, narrow foundation pit construction range, short construction period requirement, requirement that the basement is tightly attached to the supporting side line of the foundation pit, strict control requirement of the surrounding environment and limitation of the horizontal component of the foundation pit supporting to be exposed to the red line, and has the advantages of safety, short construction period and low engineering cost.
Secondly, the multi-surface lateral supporting wall is formed by constructing the mixing piles, the precast piles, the sub-belt connecting steel members and the micro-expansion concrete, each lateral supporting wall is connected with the underground retaining wall to form a T-shaped structure, so that the lateral displacement of the soil body in a certain range outside the foundation pit is limited, the gravity of the soil body around the periphery of the foundation pit is fully transferred to realize the self-stabilization of the soil body, the stability of the supporting structure is improved, the displacement of the foundation pit is favorably controlled, and the economical efficiency of foundation pit supporting is realized.
Thirdly, the scheme of connection among the precast pile annular belt, the precast pile sub-belt, the micro-expansion concrete, the connecting steel member, the externally-hung steel member and the sub-belt connecting steel member is realized, and the prefabricated pile sub-belt has the advantages of simple and reliable structure, convenience in construction and low cost.
Fourthly, the utility model further transfers the gravity of the soil around the periphery of the foundation pit to realize the self-stabilization of the soil and control the displacement of the foundation pit by arranging the prestressed anchor cables, thereby improving the rigidity and the anti-overturning capability of the supporting structure, avoiding the prestressed anchor cables from generating red lines and realizing the green and environment-friendly excavation of the foundation pit.
Drawings
The utility model is described in further detail below with reference to the following figures and specific examples:
FIG. 1 is a schematic structural diagram of a combined prefabricated dado square pile foundation pit supporting structure of the utility model;
FIG. 2 is a cross-sectional view A-A of FIG. 1, taken in accordance with protocol one;
FIG. 3 is a cross-sectional view B-B of FIG. 1, taken in accordance with protocol one;
FIG. 4-1 is a C-C cross sectional view of FIG. 1 before foundation pit construction according to the first embodiment;
4-2 are C-C sectional views of FIG. 1 after foundation pit construction using scenario one;
4-3 are cross-sectional views C-C of FIG. 1 after construction of the basement using option one;
FIG. 5 is a schematic cross-sectional view of a double-groove precast pile according to the present invention;
FIG. 6 is a schematic cross-sectional view of a single-groove precast pile according to the present invention;
FIG. 7 is a sectional view taken along line B-B of FIG. 1 when embodiment two is employed;
fig. 8 is a sectional view B-B of fig. 1 when the third embodiment is adopted.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and the accompanying drawings to help those skilled in the art to better understand the inventive concept of the present invention, but the scope of the claims of the present invention is not limited to the following embodiments, and all other embodiments obtained without inventive work by those skilled in the art will fall within the scope of the present invention without departing from the inventive concept of the present invention.
Example one
As shown in fig. 1 to 8, the utility model discloses a combined prefabricated dado square pile foundation pit supporting structure, which comprises: a plurality of groups of mixing piles 1 are connected to form a mixing pile ring belt 1-1; a plurality of precast piles 2 are vertically inserted into the mixing pile ring belt 1-1 to form a precast pile ring belt 2-1 extending along the mixing pile ring belt 1-1; a steel member is pressed between two adjacent precast piles 2 and micro-expansion concrete 3 is filled in the steel member, so that the precast pile annuluses 2-1 are connected to form an underground retaining wall, wherein the steel member is divided into a connecting steel member 4 and an externally-hung steel member 5 which can play a role in connecting the precast piles 2, and the externally-hung steel member 5 is provided with an externally-hung part 5-1 extending out of the inner side surface of the precast pile annulus 2-1; and a basement 6 is arranged in a foundation pit constructed in the enclosing range of the underground retaining wall, the external hanging part 5-1 of the external hanging steel member 5 is externally hung with the reinforcing steel bars of the lining wall 6-1 of the basement 6 and is buried in the concrete of the lining wall 6-1, wherein before the basement 6 is constructed, the inner side surface of the underground retaining wall is subjected to surface cement soil removal and net hanging and concrete spraying construction, so that the external hanging part 5-1 of the external hanging steel member 5 is exposed in the foundation pit.
Therefore, the water-stopping and soil-retaining integrated underground retaining wall is formed by constructing the mixing pile 1, the precast pile 2, the connecting steel member 4, the externally-hung steel member 5 and the micro-expansion concrete 3, so that the support stability is provided for the foundation pit, and the foundation pit can be rapidly and safely excavated in the enclosing and shielding range of the underground retaining wall;
moreover, the external hanging part 5-1 of the external hanging steel member 5 is used for externally hanging the lining wall 6-1 of the basement 6, so that a fertilizer groove required by the lining wall 6-1 of the basement 6 in conventional construction can be eliminated, the excavation and filling of a foundation pit are reduced, the use area of the basement 6 is enlarged, the reinforcing bars of the lining wall of the basement 6 can be reduced and even eliminated, the underground retaining wall can be used as a permanent structure without being dismantled, the underground retaining wall can be used as the outer wall of the basement 6 in both a construction stage and a use stage, and the construction cost is obviously saved;
therefore, the method is suitable for the foundation pit supporting engineering which has the advantages of limited land use of the supporting structure, narrow foundation pit construction range, short construction period requirement, requirement that the basement 6 is tightly attached to the supporting side line of the foundation pit, strict control requirement of the surrounding environment and limitation of the horizontal component of the foundation pit supporting to be out of the red line, and has safety, short construction period and low engineering cost.
The above is a basic implementation manner of the first embodiment, and further optimization, improvement and limitation may be performed on the basis of the basic implementation manner:
preferably: the combined prefabricated dado square pile foundation pit supporting structure is connected with a stirring pile sub-belt 1-2 formed by connecting a plurality of groups of stirring piles 1 at the position corresponding to each externally hung steel member 5, and each stirring pile sub-belt 1-2 is vertically connected to the outer side surface of the stirring pile ring belt 1-1; at least one precast pile 2 is inserted into each stirring pile sub-belt 1-2 to form a precast pile sub-belt 2-2 vertically connected with the outer side surface of the precast pile annular belt 2-1; preferably, each stirring pile auxiliary belt 1-2 and each externally hung steel member 5 are uniformly arranged at intervals along the extension direction of the stirring pile annular belt 1-1.
The external hanging steel member 5 is further provided with a connecting part 5-2 extending out of the outer side face of the precast pile girdle 2-1, the connecting part 5-2 of the external hanging steel member 5 is connected with the precast pile 2 connected with the precast pile girdle 2-1 in the precast pile sub-belts 2-2 through micro-expansion concrete 3, and sub-belt connecting steel members 7 are pressed between two adjacent precast piles 2 forming the precast pile sub-belts 2-2 and filled with the micro-expansion concrete 3, so that the precast pile sub-belts 2-2 are connected to form a lateral support wall.
Therefore, the utility model constructs the mixing pile 1, the precast pile 2, the sub-belt connecting steel member 7 and the micro-expansion concrete 3 to form a multi-surface lateral support wall, so that each lateral support wall is connected with the underground retaining wall to form a T-shaped structure to limit the lateral displacement of the soil body in a certain range outside the foundation pit, fully mobilize the gravity of the soil body around the periphery of the foundation pit to realize the self-stabilization of the soil body, improve the stability of the supporting structure, be beneficial to controlling the displacement of the foundation pit and realize the economy of the foundation pit supporting.
Example two
On the basis of the first embodiment, the second embodiment also adopts the following preferred embodiments:
precast pile clitellum 2-1, precast pile subband 2-2, little expanded concrete 3, connecting steel member 4, external steel member 5 and subband connecting steel member 7 between the connected mode, preferably adopt one of following three kinds of schemes:
in a first scheme, referring to fig. 2 to 6, the precast pile 2 has a rectangular cross section and is divided into a double-groove precast pile 2A and a single-groove precast pile 2B, the double-groove precast pile 2A is symmetrically provided with double-row grooves 2A1 extending axially along the double-groove precast pile on two opposite side surfaces, and the single-groove precast pile 2B is symmetrically provided with single-row grooves 2B1 extending axially along the single-groove precast pile on two opposite side surfaces;
moreover, the precast pile girdle 2-1 is formed by adopting the double-groove precast pile 2A, and the precast pile sub-girdle 2-2 is formed by adopting the single-groove precast pile 2B; at the connecting steel member 4, the double-row grooves 2A1 of two adjacent double-groove precast piles 2A are connected to form two filling holes, the connecting steel member 4 is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and the two filling holes are filled with micro-expansion concrete 3; at the external steel member 5, a gap is reserved between two adjacent double-groove precast piles 2A, double-row grooves 2A1 of the two double-groove precast piles 2A are communicated with a single-row groove 2B1 of a single-groove precast pile 2B in the precast pile sub-belt 2-2 through the gap to form a special-shaped filling hole, the external steel member 5 is two transversely arranged I-shaped steels, one end parts of the two I-shaped steels are inserted into the double-row groove 2A1, the other end parts of the two I-shaped steels are respectively used as an external hanging part 5-1 and a connecting part 5-2 of the external steel member 5, and micro-expansion concrete 3 is filled in the special-shaped filling hole; at the sub-belt connecting steel member 7, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form a filling hole, and the sub-belt connecting steel member 7 is an I-shaped steel which is inserted into the filling hole and is transversely arranged;
here, the longitudinal direction described herein refers to the vertical direction in the drawings of fig. 2, 7, and 8, and the lateral direction described herein refers to the horizontal direction in the drawings of fig. 2, 7, and 8.
Secondly, referring to fig. 5 to 7, the precast pile 2 has a rectangular cross section and is divided into a double-groove precast pile 2A and a single-groove precast pile 2B, the double-groove precast pile 2A is symmetrically provided with double-row grooves 2A1 extending along the axial direction thereof on two opposite side surfaces, and the single-groove precast pile 2B is symmetrically provided with single-row grooves 2B1 extending along the axial direction thereof on two opposite side surfaces;
moreover, the precast pile girdle 2-1 is formed by adopting the double-groove precast pile 2A, and the precast pile sub-girdle 2-2 is formed by adopting the single-groove precast pile 2B; at the connecting steel member 4, the double-row grooves 2A1 of two adjacent double-groove precast piles 2A are connected to form two filling holes, the connecting steel member 4 is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and the two filling holes are filled with micro-expansion concrete 3; at the external steel member 5, a gap is reserved between two adjacent double-groove precast piles 2A, double-row grooves 2A1 of the two double-groove precast piles 2A are communicated with single-row grooves 2B1 of a single-groove precast pile 2B in the precast pile sub-belt 2-2 through the gap to form a special-shaped filling hole, the external steel member 5 is an I-shaped steel, a web plate of the I-shaped steel is provided with two rib plates 5-3 and is transversely arranged, the two rib plates 5-3 of the I-shaped steel are inserted into the double-row grooves 2A1, two end parts of the I-shaped steel are respectively used as an external part 5-1 and a connecting part 5-2 of the external steel member 5, and micro-expansion concrete 3 is filled in the special-shaped filling hole; at the sub-belt connecting steel member 7, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form a filling hole, and the sub-belt connecting steel member 7 is an I-shaped steel which is inserted into the filling hole and is transversely arranged;
thirdly, referring to fig. 6 and 8, the precast pile 2 is a single-groove precast pile 2B with a rectangular cross section, and the single-groove precast pile 2B is symmetrically provided with single-row grooves 2B1 extending axially along two opposite side surfaces thereof;
in addition, at the connecting steel member 4, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form a filling hole, the connecting steel member 4 is an i-steel which is inserted into the filling hole and is arranged longitudinally, and the filling hole is filled with micro-expansion concrete 3; at the external steel member 5, a gap is reserved between two adjacent single-groove precast piles 2B, the single-row grooves 2B1 of the two single-groove precast piles 2B are communicated with the single-row grooves 2B1 of the single-groove precast piles 2B in the precast pile sub-belt 2-2 through the gap to form a special-shaped filling hole, the external steel member 5 is an I-shaped steel, the web plate of the I-shaped steel is provided with a ribbed plate 5-3 and is transversely arranged, the ribbed plate 5-3 of the I-shaped steel is inserted into the single-row grooves 2B1, two end parts of the I-shaped steel are respectively used as an external part 5-1 and a connecting part 5-2 of the external steel member 5, and micro-expansion concrete 3 is filled in the special-shaped filling hole; at the sub-belt connecting steel member 7, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form one filling hole, and the sub-belt connecting steel member 7 is an i-steel which is inserted into the filling hole and is transversely arranged.
The above is the basic implementation manner of the second embodiment, and further optimization, improvement and limitation can be made on the basis of the basic implementation manner:
preferably: the precast pile 2 has a central hole 2c extending along the axial direction thereof to reduce the weight of the precast pile 2 for easy transportation; the top of the central hole 2c is filled with micro-expansive concrete, typically to a depth of 2 m.
EXAMPLE III
On the basis of the first embodiment or the second embodiment, the third embodiment further adopts the following preferred embodiments:
the top of the underground retaining wall is provided with a crown beam 8, the top of the lateral supporting wall is provided with a connecting beam 9, wherein the crown beam 8 and the connecting beam 9 are both reinforced concrete beams, and the reinforcing steel bars of the crown beam 8 and the connecting beam 9 are lapped with the reinforcing steel bars of the corresponding precast pile 2;
a wedge-shaped anchor backing plate 10 is placed on the top surface of the connecting beam 9, the wedge-shaped anchor backing plate 10 is provided with an inclined surface which inclines inwards, a prestressed anchor cable 11 is stretched on the combined prefabricated dado square pile foundation pit supporting structure, the upper end of the prestressed anchor cable 11 is locked on the inclined surface of the wedge-shaped anchor backing plate 10, and the lower end of the prestressed anchor cable 11 is anchored in an underground soil body.
Therefore, the utility model further transfers the gravity of the soil around the periphery of the foundation pit to realize the self-stabilization of the soil and control the displacement of the foundation pit by arranging the prestressed anchor cables 11, improves the rigidity and the anti-overturning capability of the supporting structure, avoids the prestressed anchor cables 11 from generating red lines, and realizes the green and environment-friendly excavation of the foundation pit.
Example four
As shown in fig. 1 to 8, the utility model also discloses a construction method of the combined prefabricated dado square pile foundation pit supporting structure, which comprises the following steps:
s1, leveling a construction site of the foundation pit, and emigrating a pipeline influencing foundation pit construction;
s2, constructing a plurality of groups of mixing piles 1 on the construction site to form mixing pile ring belts 1-1 surrounding the foundation pit to be constructed in a connected mode; and vertically inserting a precast pile 2 into the mixing pile 1 to form a precast pile annulus 2-1 extending along the mixing pile annulus 1-1;
before the initial setting of the gelled body formed by mixing the cement slurry in the hole and the soil of the mixing pile 1, the corresponding precast pile 2 is inserted so as to prevent the precast pile 2 from being difficult to insert or the mixing pile 1 from firmly fixing the precast pile 2, and the interval between the construction time of the mixing pile 1 and the insertion time of the precast pile 2 is not more than 0.5 hour;
wherein, each group of the mixing piles 1 can be any one of a single-shaft mixing pile, a double-shaft mixing pile, a three-shaft mixing pile and a multi-shaft mixing pile, and is selected according to construction requirements;
in addition, the precast pile 2 can be inserted into the mixing pile 1 through a positioning guide frame fixed on the ground to ensure the perpendicularity of the precast pile 2.
Step S3, referring to fig. 4-1, pressing a steel member between two adjacent precast piles 2 and filling micro-expansion concrete 3 to connect the precast pile loops 2-1 to form an underground retaining wall enclosing the foundation pit to be constructed; the steel members comprise a connecting steel member 4 and an externally hung steel member 5 which can play a role in connecting the precast pile 2, and the externally hung steel member 5 is provided with an externally hung part 5-1 extending out of the inner side surface of the annular belt 2-1 of the precast pile; the micro-expansion concrete 3 does not need to be filled to the depth of the whole length of the precast pile 2, and is generally filled to the position 2m below the bottom plate of the basement 6.
Step S4, referring to a picture 4-2, in the enclosing and shielding range of the underground retaining wall, excavating earthwork to the bottom of a foundation pit in a layered and segmented manner, removing surface cement soil on the inner side surface of the underground retaining wall, and carrying out net hanging and concrete spraying construction to enable an externally hanging part 5-1 of an externally hanging steel member 5 to be exposed in the foundation pit;
step S5, referring to fig. 4-3, constructing a basement 6 in the foundation pit, wherein the external hanging part 5-1 of the external hanging steel member 5 is externally hung with the steel bars of the lining wall 6-1 of the basement 6 and is buried in the concrete of the lining wall 6-1.
Therefore, the water-stopping and soil-retaining integrated underground retaining wall is formed by constructing the mixing pile 1, the precast pile 2, the connecting steel member 4, the externally-hung steel member 5 and the micro-expansion concrete 3, so that the support stability is provided for the foundation pit, and the foundation pit can be rapidly and safely excavated in the enclosing and shielding range of the underground retaining wall;
moreover, the external hanging part 5-1 of the external hanging steel member 5 is used for hanging the lining wall 6-1 of the basement 6 externally, so that a fertilizer groove required by the lining wall 6-1 of the basement 6 in conventional construction can be eliminated, the excavation and filling of a foundation pit are reduced, the use area of the basement 6 is enlarged, the embedded wall steel bars of the basement 6 can be reduced or even eliminated, the underground retaining wall can be used as a permanent structure without being dismantled, the underground retaining wall can be used as the outer wall of the basement 6 in both the construction stage and the use stage, and the construction cost is obviously saved;
therefore, the method is suitable for the foundation pit supporting engineering which has the advantages of limited supporting structure land, narrow foundation pit construction range, short construction period requirement, requirement that the basement 6 is tightly attached to the supporting side line of the foundation pit, strict control requirement of the surrounding environment and limitation of the horizontal component of the foundation pit supporting to be exposed to the red line, and has safety, short construction period and low engineering cost.
The above is the basic implementation of the fourth embodiment, and further optimization, improvement and limitation can be made on the basis of the basic implementation:
preferably: in the step S2, a stirring pile sub-band 1-2 is formed by connecting the stirring pile 1 constructed on the construction site corresponding to the position of each externally hung steel member 5, and each stirring pile sub-band 1-2 is vertically connected to the outer side surface of the stirring pile annulus 1-1; at least one precast pile 2 is inserted into each stirring pile sub-belt 1-2 to form a precast pile sub-belt 2-2 vertically connected with the outer side surface of the precast pile annular belt 2-1; preferably, each stirring pile auxiliary belt 1-2 and each externally hung steel member 5 are uniformly arranged at intervals along the extension direction of the stirring pile annular belt 1-1.
In the step S3, the external steel member 5 further has a connecting portion 5-2 extending out of the outer side surface of the precast pile circumferential band 2-1, the connecting portion 5-2 of the external steel member 5 connects the precast pile 2 connected to the precast pile circumferential band 2-1 in the precast pile sub-band 2-2 through micro-expansion concrete 3, and a sub-band connecting steel member 7 is pressed between two adjacent precast piles 2 forming the precast pile sub-band 2-2 and the micro-expansion concrete 3 is filled to connect the precast pile sub-bands 2-2 to form a lateral support wall.
Therefore, the utility model constructs the mixing pile 1, the precast pile 2, the sub-belt connecting steel member 7 and the micro-expansion concrete 3 to form a multi-surface lateral support wall, so that each lateral support wall is connected with the underground retaining wall to form a T-shaped structure to limit the lateral displacement of the soil body in a certain range outside the foundation pit, fully mobilize the gravity of the soil body around the periphery of the foundation pit to realize the self-stabilization of the soil body, improve the stability of the supporting structure, be beneficial to controlling the displacement of the foundation pit and realize the economy of the foundation pit supporting.
EXAMPLE five
On the basis of the fourth embodiment, the fifth embodiment further adopts the following preferred embodiments:
the connection mode among the precast pile annular belt 2-1, the precast pile auxiliary belt 2-2, the micro-expansion concrete 3, the connecting steel member 4, the externally-hung steel member 5 and the auxiliary belt connecting steel member 7 preferably adopts one of the following three schemes:
in a first scheme, referring to fig. 2 to 6, the precast pile 2 has a rectangular cross section and is divided into a double-groove precast pile 2A and a single-groove precast pile 2B, the double-groove precast pile 2A is symmetrically provided with double-row grooves 2A1 extending axially along the double-groove precast pile on two opposite side surfaces, and the single-groove precast pile 2B is symmetrically provided with single-row grooves 2B1 extending axially along the single-groove precast pile on two opposite side surfaces;
moreover, the precast pile girdle 2-1 is formed by adopting the double-groove precast pile 2A, and the precast pile sub-girdle 2-2 is formed by adopting the single-groove precast pile 2B; at the connecting steel member 4, the double-row grooves 2A1 of two adjacent double-groove precast piles 2A are connected to form two filling holes, the connecting steel member 4 is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and the two filling holes are filled with micro-expansion concrete 3; at the external steel member 5, a gap is reserved between two adjacent double-groove precast piles 2A, double-row grooves 2A1 of the two double-groove precast piles 2A are communicated with a single-row groove 2B1 of a single-groove precast pile 2B in the precast pile sub-belt 2-2 through the gap to form a special-shaped filling hole, the external steel member 5 is two transversely arranged I-shaped steels, one end parts of the two I-shaped steels are inserted into the double-row groove 2A1, the other end parts of the two I-shaped steels are respectively used as an external hanging part 5-1 and a connecting part 5-2 of the external steel member 5, and micro-expansion concrete 3 is filled in the special-shaped filling hole; at the sub-belt connecting steel member 7, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form a filling hole, and the sub-belt connecting steel member 7 is an I-shaped steel which is inserted into the filling hole and is transversely arranged;
here, the longitudinal direction described herein refers to the up-down direction in fig. 2, 7, and 8, and the lateral direction described herein refers to the left-right direction in fig. 2, 7, and 8.
Secondly, referring to fig. 5 to 7, the precast pile 2 has a rectangular cross section and is divided into a double-groove precast pile 2A and a single-groove precast pile 2B, the double-groove precast pile 2A is symmetrically provided with double-row grooves 2A1 extending along the axial direction thereof on two opposite side surfaces, and the single-groove precast pile 2B is symmetrically provided with single-row grooves 2B1 extending along the axial direction thereof on two opposite side surfaces;
moreover, the precast pile girdle 2-1 is formed by adopting the double-groove precast pile 2A, and the precast pile sub-girdle 2-2 is formed by adopting the single-groove precast pile 2B; at the connecting steel member 4, the double-row grooves 2A1 of two adjacent double-groove precast piles 2A are connected to form two filling holes, the connecting steel member 4 is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and the two filling holes are filled with micro-expansion concrete 3; at the external steel member 5, a gap is reserved between two adjacent double-groove precast piles 2A, double-row grooves 2A1 of the two double-groove precast piles 2A are communicated with single-row grooves 2B1 of a single-groove precast pile 2B in the precast pile sub-belt 2-2 through the gap to form a special-shaped filling hole, the external steel member 5 is an I-shaped steel, a web plate of the I-shaped steel is provided with two rib plates 5-3 and is transversely arranged, the two rib plates 5-3 of the I-shaped steel are inserted into the double-row grooves 2A1, two end parts of the I-shaped steel are respectively used as an external part 5-1 and a connecting part 5-2 of the external steel member 5, and micro-expansion concrete 3 is filled in the special-shaped filling hole; at the sub-belt connecting steel member 7, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form a filling hole, and the sub-belt connecting steel member 7 is an I-shaped steel which is inserted into the filling hole and is transversely arranged;
thirdly, referring to fig. 6 and 8, the precast pile 2 is a single-groove precast pile 2B with a rectangular cross section, and the single-groove precast pile 2B is symmetrically provided with single-row grooves 2B1 extending axially along two opposite side surfaces thereof;
in addition, at the connecting steel member 4, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form a filling hole, the connecting steel member 4 is an i-steel which is inserted into the filling hole and is arranged longitudinally, and the filling hole is filled with micro-expansion concrete 3; a gap is reserved between every two adjacent single-groove precast piles 2B at the external steel member 5, the single-row grooves 2B1 of the two single-groove precast piles 2B are communicated with the single-row grooves 2B1 of the single-groove precast piles 2B in the precast pile sub-belt 2-2 through the gap to form a special-shaped filling hole, the external steel member 5 is an I-shaped steel, the web plate of the I-shaped steel is provided with a rib plate 5-3 and is transversely arranged, the rib plate 5-3 of the I-shaped steel is inserted into the single-row grooves 2B1, two end parts of the I-shaped steel are respectively used as an external part 5-1 and a connecting part 5-2 of the external steel member 5, and the special-shaped filling hole is filled with micro-expansion concrete 3; at the sub-belt connecting steel member 7, the single-row grooves 2B1 of two adjacent single-groove precast piles 2B are connected to form one filling hole, and the sub-belt connecting steel member 7 is an i-steel which is inserted into the filling hole and is transversely arranged.
The above is the basic implementation of the fifth embodiment, and further optimization, improvement and limitation may be performed on the basis of the basic implementation:
preferably: the precast pile 2 has a central hole 2c extending along the axial direction thereof to reduce the weight of the precast pile 2 for easy transportation; in step S3, the top of the central hole 2c is also filled with micro-expansive concrete, typically to a depth of 2 m.
EXAMPLE six
On the basis of the fourth or fifth embodiment, the sixth embodiment further adopts the following preferred embodiments:
the construction method further includes, after the step S3 and before the step S4:
step S3-1, carrying out slope excavation on soil above the underground retaining wall and the lateral supporting wall, constructing a crown beam 8 on the top of the underground retaining wall, and constructing a connecting beam 9 on the top of the lateral supporting wall, wherein the crown beam 8 and the connecting beam 9 are both reinforced concrete beams, and reinforcing steel bars of the crown beam 8 and the connecting beam 9 are overlapped with reinforcing steel bars of the corresponding precast pile 2;
step S3-2, after the crown beam 8 and the connecting beam 9 reach 70% of design strength, placing a wedge-shaped anchor backing plate 10 on the top surface of the connecting beam 9, wherein the wedge-shaped anchor backing plate 10 is provided with an inclined surface inclined inwards, and tensioning the prestressed anchor cable 11, so that the upper end of the prestressed anchor cable 11 is locked on the inclined surface of the wedge-shaped anchor backing plate 10, and the lower end of the prestressed anchor cable 11 is anchored in an underground soil body.
Therefore, the utility model further transfers the gravity of the soil around the periphery of the foundation pit to realize the self-stabilization of the soil and control the displacement of the foundation pit by arranging the prestressed anchor cables 11, improves the rigidity and the anti-overturning capability of the supporting structure, avoids the prestressed anchor cables 11 from generating red lines, and realizes the green and environment-friendly excavation of the foundation pit.
The present invention is not limited to the above embodiments, and various other equivalent modifications, substitutions or alterations can be made on the basis of the above description and the common general technical knowledge and conventional means in the field without departing from the basic technical idea of the utility model.
Claims (7)
1. The utility model provides a combination prefabricated dado square pile foundation ditch supporting construction which characterized in that includes: a stirring pile ring belt (1-1) formed by connecting a plurality of groups of stirring piles (1); a plurality of precast piles (2) are vertically inserted into the mixing pile annular belt (1-1) to form a precast pile annular belt (2-1) extending along the mixing pile annular belt (1-1); a steel member is pressed in between two adjacent precast piles (2) and is filled with micro-expansion concrete (3), so that the precast pile annuluses (2-1) are connected to form an underground retaining wall, wherein the steel member is divided into a connecting steel member (4) and an externally-hanging steel member (5) which can play a role in connecting the precast piles (2), and the externally-hanging steel member (5) is provided with an externally-hanging part (5-1) extending out of the inner side face of the precast pile annuluses (2-1); and a basement (6) is arranged in a foundation pit constructed in the enclosing range of the underground retaining wall, and an externally hung part (5-1) of the externally hung steel member (5) is externally hung with the steel bars of a lining wall (6-1) of the basement (6) and is buried in the concrete of the lining wall (6-1).
2. The combined prefabricated dado square pile foundation pit supporting structure according to claim 1, characterized in that: the combined prefabricated dado square pile foundation pit supporting structure is connected with a position corresponding to each externally hung steel member (5) to form a stirring pile sub-belt (1-2) formed by connecting a plurality of groups of stirring piles (1), and each stirring pile sub-belt (1-2) is vertically connected to the outer side face of the stirring pile ring belt (1-1); at least one precast pile (2) is inserted into each mixing pile sub-belt (1-2) to form a precast pile sub-belt (2-2) vertically connected with the outer side surface of the precast pile ring belt (2-1);
the external steel member (5) is further provided with a connecting part (5-2) extending out of the outer side face of the precast pile girdle (2-1), the connecting part (5-2) of the external steel member (5) is connected with the precast pile (2) connected with the precast pile girdle (2-1) in the precast pile sub-belts (2-2) through micro-expansion concrete (3), and sub-belt connecting steel members (7) are pressed between two adjacent precast piles (2) forming the precast pile sub-belts (2-2) and the micro-expansion concrete (3) is filled, so that the precast pile sub-belts (2-2) are connected to form a lateral support wall.
3. The combined prefabricated dado square pile foundation pit supporting structure according to claim 2, characterized in that: precast pile clitellum (2-1), precast pile subband (2-2), micro-expansive concrete (3), connecting steel member (4), external steel member (5) and subband connecting steel member (7) between connected mode, as follows:
the precast pile (2) is provided with a rectangular cross section and is divided into a double-groove precast pile (2A) and a single-groove precast pile (2B), the two opposite side surfaces of the double-groove precast pile (2A) are symmetrically provided with double-row grooves (2A1) extending along the axial direction of the double-groove precast pile, and the two opposite side surfaces of the single-groove precast pile (2B) are symmetrically provided with single-row grooves (2B1) extending along the axial direction of the single-groove precast pile;
moreover, the precast pile girdle band (2-1) is formed by adopting the double-groove precast pile (2A), and the precast pile sub-band (2-2) is formed by adopting the single-groove precast pile (2B); at the connecting steel member (4), the double-row grooves (2A1) of two adjacent double-groove precast piles (2A) are connected to form two filling holes, the connecting steel member (4) is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and micro-expansion concrete (3) is filled in the two filling holes; a gap is reserved between two adjacent double-groove precast piles (2A) at the external steel member (5), double-row grooves (2A1) of the two double-groove precast piles (2A) are communicated with a single-row groove (2B1) of a single-groove precast pile (2B) in the precast pile sub-belt (2-2) through the gap to form a special-shaped filling hole, the external steel member (5) is two transverse H-shaped steels, one end parts of the two H-shaped steels are inserted into the double-row groove (2A1), the other end parts of the two H-shaped steels are respectively used as an external hanging part (5-1) and a connecting part (5-2) of the external steel member (5), and micro-expansion concrete (3) is filled in the special-shaped filling hole; at the sub-belt connecting steel member (7), the single-row grooves (2B1) of two adjacent single-groove precast piles (2B) are connected to form a filling hole, and the sub-belt connecting steel member (7) is an I-shaped steel which is inserted into the filling hole and is transversely arranged.
4. The combined prefabricated dado square pile foundation pit supporting structure according to claim 2, characterized in that: precast pile clitellum (2-1), precast pile subband (2-2), little expanded concrete (3), connecting steel member (4), external steel member (5) and subband connecting steel member (7) between the connected mode, as follows:
the precast pile (2) has a rectangular cross section and is divided into a double-groove precast pile (2A) and a single-groove precast pile (2B), two opposite side surfaces of the double-groove precast pile (2A) are symmetrically provided with double-row grooves (2A1) extending along the axial direction of the double-groove precast pile, and two opposite side surfaces of the single-groove precast pile (2B) are symmetrically provided with single-row grooves (2B1) extending along the axial direction of the single-groove precast pile;
moreover, the precast pile girdle band (2-1) is formed by adopting the double-groove precast pile (2A), and the precast pile sub-band (2-2) is formed by adopting the single-groove precast pile (2B); at the connecting steel member (4), the double-row grooves (2A1) of two adjacent double-groove precast piles (2A) are connected to form two filling holes, the connecting steel member (4) is two I-shaped steels which are respectively inserted into the two filling holes and are longitudinally arranged, and micro-expansion concrete (3) is filled in the two filling holes; a gap is reserved between two adjacent double-groove precast piles (2A) at the position of the externally-hung steel member (5), double-row grooves (2A1) of the two double-groove precast piles (2A) are communicated with single-row grooves (2B1) of single-groove precast piles (2B) in the precast pile sub-belts (2-2) through the gap to form a special-shaped filling hole, the externally-hung steel member (5) is an I-shaped steel, a web plate of the I-shaped steel is provided with two rib plates (5-3) and the I-shaped steel is transversely arranged, the two rib plates (5-3) of the I-shaped steel are inserted into the double-row grooves (2A1), two end parts of the I-shaped steel are respectively used as an externally-hung part (5-1) and a connecting part (5-2) of the externally-hung steel member (5), and micro-expansion concrete (3) is filled in the special-shaped filling hole; steel member (7) department is connected to the subband, and single groove (2B1) of two adjacent single flute precast piles (2B) are connected and are constituteed a filling hole, steel member (7) are connected for a subband insert in this filling hole and transverse arrangement's I-steel.
5. The combined prefabricated dado square pile foundation pit supporting structure of claim 2, wherein: precast pile clitellum (2-1), precast pile subband (2-2), little expanded concrete (3), connecting steel member (4), external steel member (5) and subband connecting steel member (7) between the connected mode, as follows:
the precast pile (2) is a single-groove precast pile (2B) with a rectangular cross section, and single-row grooves (2B1) extending along the axial direction of the single-groove precast pile (2B) are symmetrically arranged on the two opposite side surfaces of the single-groove precast pile (2B);
in addition, single-row grooves (2B1) of two adjacent single-groove precast piles (2B) are connected to form a filling hole at the connecting steel member (4), the connecting steel member (4) is an I-shaped steel which is inserted into the filling hole and is longitudinally arranged, and micro-expansion concrete (3) is filled in the filling hole; a gap is reserved between every two adjacent single-groove precast piles (2B) at the position of the externally-hung steel member (5), single-row grooves (2B1) of the two single-groove precast piles (2B) are communicated with single-row grooves (2B1) of the single-groove precast piles (2B) in the precast pile sub-belts (2-2) through the gap to form a special-shaped filling hole, the externally-hung steel member (5) is an I-shaped steel with a web plate provided with a rib plate (5-3) and transversely arranged, the rib plate (5-3) of the I-shaped steel is inserted into the single-row grooves (2B1), two end parts of the I-shaped steel are respectively used as an externally-hung part (5-1) and a connecting part (5-2) of the externally-hung steel member (5), and micro-expansive concrete (3) is filled in the special-shaped filling hole; at the sub-belt connecting steel member (7), the single-row grooves (2B1) of two adjacent single-groove precast piles (2B) are connected to form a filling hole, and the sub-belt connecting steel member (7) is an I-shaped steel which is inserted into the filling hole and is transversely arranged.
6. The combined prefabricated dado square pile foundation pit supporting structure according to any one of claims 1 to 5, wherein: the precast pile (2) has a central hole (2c) extending axially therealong; the top of the central hole (2c) is filled with micro-expansion concrete.
7. The combined prefabricated dado square pile foundation pit supporting structure according to any one of claims 2 to 5, characterized in that: the top of the underground retaining wall is provided with a crown beam (8), the top of the lateral supporting wall is provided with a connecting beam (9), the crown beam (8) and the connecting beam (9) are both reinforced concrete beams, and reinforcing steel bars of the crown beam (8) and the connecting beam (9) are lapped with reinforcing steel bars of corresponding precast piles (2);
a wedge-shaped anchor backing plate (10) is placed on the top surface of the connecting beam (9), the wedge-shaped anchor backing plate (10) is provided with an inclined surface which inclines inwards, a prestressed anchor cable (11) is stretched in the combined prefabricated dado square pile foundation pit supporting structure, the upper end of the prestressed anchor cable (11) is locked on the inclined surface of the wedge-shaped anchor backing plate (10), and the lower end of the prestressed anchor cable (11) is anchored in an underground soil body.
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