CN114960673A - Quickly-formed deep foundation pit PC (polycarbonate) component supporting structure and construction method - Google Patents
Quickly-formed deep foundation pit PC (polycarbonate) component supporting structure and construction method Download PDFInfo
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- CN114960673A CN114960673A CN202210665975.0A CN202210665975A CN114960673A CN 114960673 A CN114960673 A CN 114960673A CN 202210665975 A CN202210665975 A CN 202210665975A CN 114960673 A CN114960673 A CN 114960673A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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Abstract
The invention discloses a fast-forming deep foundation pit PC component supporting structure and a construction method, the structure comprises a prefabricated supporting pile, the top end and the waist part of the prefabricated supporting pile are provided with embedded screws, the center of the prefabricated supporting pile is provided with a vertical grouting hole, transverse grouting holes are distributed along the vertical line, prefabricated crown beams are arranged at the top end of the prefabricated supporting pile in the same row through the embedded screws, the waist part of the prefabricated supporting pile is provided with a pile beam switching steel seat through the embedded screws, the pile beam switching steel seat in the same row is provided with a steel plate waist beam through bolts, an expansion steel pipe which penetrates through the steel plate waist beam and then obliquely extends into an anchor hole downwards is distributed along the steel plate waist beam, a hollow anchor rod with two exposed ends penetrates through the expansion steel pipe, the tail section of the expansion steel pipe is a plurality of separated steel belts, the head section of the hollow anchor rod is a thread section sleeved with a nut, the tail end is an enlarged head, the center is a through grouting hole, and the nut is pressed against the expansion steel pipe and screwed forwards so that the steel belt is unfolded into an umbrella rib shape under the extrusion of the enlarged head. The invention has the advantages of quick construction, early stress forming, safety, stability, economy and applicability.
Description
Technical Field
The invention belongs to the field of foundation pit support, and particularly relates to a quickly-formed deep foundation pit PC member support structure and a construction method.
Background
Along with more and more high-rise buildings and more deep foundation pit projects of the buildings, the deep foundation pit support is used for guaranteeing safe construction and effective drainage of a soil body structure in a foundation pit, and is used as a temporary project and strictly controlling the construction cost. At present, a deep foundation pit mainly adopts a supporting structure of a cast-in-place supporting pile and an anchor rope, so that the construction period is longer, and the construction cost is higher.
Disclosure of Invention
The invention aims to provide a quickly-formed deep foundation pit PC component supporting structure and a construction method, which are quick in construction, early in stressed forming, safe, stable and good in economic applicability.
The technical scheme adopted by the invention is as follows:
a fast-forming deep foundation pit PC component supporting structure comprises a prefabricated supporting pile, wherein the top end and the waist of the prefabricated supporting pile are provided with embedded screws, the center of the prefabricated supporting pile is provided with a vertical grouting hole, transverse grouting holes are distributed along the vertical line, soil body gaps in the pile holes and around the pile holes are filled with rapid-setting cement paste through pressure pouring of the vertical grouting holes, prefabricated crown beams are installed at the top ends of the prefabricated supporting piles in the same row through the embedded screws, the waist of the prefabricated supporting pile is provided with pile beam switching steel seats through the embedded screws, the pile beam switching steel seats in the same row are provided with steel plate waist beams through bolts, expansion steel pipes which penetrate through the steel plate waist beams and extend into anchor holes obliquely downwards are distributed along the steel plate waist beams, hollow anchor rods with exposed two ends penetrate through the expansion steel pipes, the tail section of each expansion steel pipe is provided with a plurality of separated steel belts, the first section of each hollow anchor rod is provided with a screw thread section sleeved with a nut, the tail end of each expansion head, and the center of each hollow anchor rod is a through grouting hole, the nut is pressed against the expansion steel pipe and is screwed forwards, so that the steel belt is unfolded into a rib shape under the extrusion of the expansion head, and quick-setting cement slurry is poured into gaps between the anchor hole and the surrounding soil body through the pressure of the grouting hole for filling.
Furthermore, one side of the pile beam switching steel base is an arc-shaped groove attached to the prefabricated support pile, the other side of the pile beam switching steel base is a box-shaped groove, and the box-shaped groove is provided with a through hole corresponding to the embedded screw and the bolt.
Furthermore, the expansion steel pipe penetrates through the steel plate waist beam, a steel backing plate is sleeved on the position of the steel plate waist beam, the nut is pressed on the steel plate waist beam through the steel backing plate, and the contact surface of the steel backing plate and the nut is an inclined surface adaptive to the angle of the anchor hole.
Furthermore, one surface of the expanded head extruding the steel strip is a curved surface.
Furthermore, the embedded screws at the top end of the prefabricated support pile are uniformly distributed around the shaft center.
A quick forming deep foundation pit PC component support construction method comprises the following steps of:
s1, manufacturing a PC component in advance: determining the size according to construction requirements, manufacturing a prefabricated support pile and a prefabricated crown beam in advance in a factory, reserving a vertical grouting hole, a transverse grouting hole and a pre-embedded screw on the prefabricated support pile, and reserving a through hole of the pre-embedded screw on the prefabricated crown beam;
s2, measurement and paying-off: measuring the plane position and the elevation of the prefabricated support piles around the foundation pit after lofting, and arranging a drilling machine according to the lofting position;
s3, drilling, installing and grouting the prefabricated support piles: rotary excavating to form a hole at the position of the prefabricated support pile, cleaning the hole after the prefabricated support pile reaches the designed pile bottom elevation, immediately hoisting the prefabricated support pile by using a crane after the hole is cleaned, vertically inserting the prefabricated support pile into the pile hole, pressure-pouring quick-setting cement slurry through a vertical grouting hole after the prefabricated support pile is in place, filling the gap between the prefabricated support pile and the pile hole, and infiltrating into the soil body around to be consolidated into a whole;
s4, mounting the prefabricated crown beam: the prefabricated supporting piles in the same row are provided with prefabricated crown beams at the top ends through embedded screws to form integral stress;
s5, excavating a foundation pit: carrying out layered excavation on earthwork in the foundation pit, and carrying out hanging net concrete spraying treatment on the excavated bare and leaked soil body in time;
s6, installing the pile beam switching steel seat and the steel plate waist beam: after the waist of the prefabricated support pile is excavated, soil and slurry near the waist embedded screw are cleaned, a protective sleeve on the waist embedded screw is taken down, pile beam switching steel seats are installed on the waist of the prefabricated support pile through the embedded screw, and the pile beam switching steel seats in the same row are provided with steel plate waist beams through bolts, so that the integral stress is enhanced;
s7, installing, pressing and grouting an expansion steel pipe and a hollow anchor rod: drilling an anchor hole along the steel plate waist beam according to the length and the inclination angle of the hollow anchor rod, enabling the sleeved expansion steel pipe and the hollow anchor rod to penetrate through the steel plate waist beam and then obliquely extend downwards into the anchor hole, pushing a nut on the expansion steel pipe and screwing the nut forwards to enable a steel belt to expand under the extrusion of an expansion head and invade a surrounding soil body to form a rib shape, pouring quick setting cement paste through the pressure of a grouting hole, and filling gaps between the soil body in the anchor hole and the surrounding soil body;
s8, excavation and dewatering of the foundation pit: continuously excavating to the bottom of the foundation pit in a layered manner, making drainage measures for the bottom of the foundation pit, and constructing a foundation and an underground structure;
s9, foundation pit backfilling: and (3) timely carrying out layered backfilling on the foundation pit, removing the recovered pile beam switching steel seat and the steel plate waist beam when backfilling to the waist of the prefabricated support pile, and removing the recovered prefabricated crown beam after backfilling to the top of the foundation pit.
Further, when the quick-setting cement paste is pressure-poured, the strength of the paste is M20, the 2Mpa grouting pressure is kept, and grouting is finished after the pressure is stabilized for 3 min.
And further, when the longer precast crown beams on the single side of the foundation pit need to be continuously spliced, the adjacent precast crown beams are connected through a steel plate and a hole reserved in advance.
The invention has the beneficial effects that:
the PC member (precast concrete) has the advantages of standardization, integration and high forming speed, the precast support piles and the precast crown beams are adopted, the precast support piles and the precast crown beams can be quickly installed and spliced, the pile foundation concrete pouring and maintenance processes are not needed, the construction is quick, the stressed forming is early, the construction can be quickly carried out on the deep foundation pit foundation, and the construction period is greatly saved; the prefabricated support pile is matched with the prefabricated crown beam pile beam, the adapting steel seat and the steel plate waist beam to form a whole body, the whole body and the soil body are anchored by the expanding steel pipe and the hollow anchor rod, gaps of the soil body in the pile hole and around are filled with the rapid-setting cement paste through pressure filling of the vertical grouting hole, gaps of the soil body in the anchor hole and around are filled with the rapid-setting cement paste through pressure filling of the grouting hole, the supporting structure is safe and stable, and the working procedures are connected quickly; the steel belt of the tail section of the expansion steel pipe is unfolded and invaded into the surrounding soil body to form an umbrella rib shape, so that the resisting force of the anchoring end is greatly enhanced; the transverse grouting holes can play a role in communication when the vertical grouting holes are used for grouting, so that slurry in the annular space is promoted to flow, and timely slurry supplement can be performed during layered excavation, so that the filling effect is ensured; the prefabricated crown beam, the pile beam switching steel seat and the steel plate waist beam can be disassembled step by step in the process of backfilling the foundation pit step by step, the reutilization is high, and the economic applicability is good.
Drawings
Fig. 1 is a schematic single-side view of a rapidly-formed deep foundation pit PC member supporting structure in an embodiment of the present invention.
Fig. 2 is a sectional view of a rapidly formed PC member supporting structure of a deep foundation pit according to an embodiment of the present invention.
Fig. 3 is a schematic view of a prefabricated support pile in an embodiment of the present invention.
Fig. 4 is a schematic mounting diagram of a pile beam adapter steel base in the embodiment of the invention.
Fig. 5 is a first schematic view of the installation of the pile beam adapter steel seat, the steel plate waist beam, the expansion steel pipe and the hollow anchor rod in the embodiment of the invention.
Fig. 6 is a second schematic view of the installation of the pile beam adapter steel seat, the steel plate waist beam, the expansion steel pipe and the hollow anchor rod in the embodiment of the invention.
Fig. 7 is a schematic view of the first section of the expansion steel pipe and hollow anchor rod in the embodiment of the invention.
Fig. 8 is a schematic view of the tail section of the expanded steel pipe hollow anchor rod in the embodiment of the invention.
In the figure: 1-prefabricating a crown beam; 2, prefabricating a support pile; 3, pile beam switching steel base; 4-steel plate waist rail; 5-expanding the steel pipe; 6-hollow anchor rod; 7-vertical grouting holes; 8-transverse grouting holes; 9-basal pit bottom; 10-pre-burying a screw rod; 11-a bolt; 12-grouting holes; 13-a nut; 14-a steel backing plate; 15-a steel belt; 16-enlarged head.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in figures 1 to 8, a rapidly-formed deep foundation pit PC component supporting structure comprises a prefabricated supporting pile 2, wherein the top end and the waist part of the prefabricated supporting pile 2 are provided with embedded screws 10, the center of the prefabricated supporting pile 2 is provided with a vertical grouting hole 7, transverse grouting holes 8 are distributed along the vertical line, gaps between soil bodies in the pile holes and around the prefabricated supporting pile 2 are filled with rapid-setting cement slurry through the vertical grouting hole 7 in a pressure pouring mode, a prefabricated crown beam 1 is installed at the top end of the prefabricated supporting pile 2 in the same row through the embedded screws 10, a pile beam switching steel base 3 is installed at the waist part of the prefabricated supporting pile 2 in the same row through the embedded screws 10, a steel plate waist beam 4 is installed on the pile beam switching steel base 3 in the same row through bolts 11, an expansion steel pipe 5 which penetrates through the steel plate waist beam 4 and then obliquely and downwards extends into an anchor hole is distributed along the steel plate waist beam 4, a hollow anchor rod 6 with two exposed ends penetrates through the expansion steel pipe 5, the tail section of the expansion steel pipe 5 is a plurality of separated steel belts 15, the head section of the hollow anchor rod 6 is sleeved with a nut 13, The tail end is an enlarged head 16, the center is a through grouting hole 12, a nut 13 is pressed against the expansion steel pipe 5 and screwed forwards, so that the steel belt 15 is unfolded into a rib shape under the extrusion of the enlarged head 16, and quick-setting cement slurry is pressure-poured into gaps of soil bodies in the anchor hole and around to fill the gaps of the soil bodies through the grouting hole 12.
As shown in fig. 3, in this embodiment, the embedded screws 10 at the top end of the prefabricated support pile 2 are uniformly distributed around the axis, and the installation effect is good.
As shown in fig. 4 to 6, in this embodiment, one side of the pile beam transition steel base 3 is an arc-shaped groove attached to the precast support pile 2, and the other side is a box-shaped groove, the box-shaped groove is provided with a through hole corresponding to the embedded screw 10 and the bolt 11, the arc-shaped groove ensures stable installation, and the box-shaped groove provides a space for tightening operation.
As shown in fig. 7, in this embodiment, a steel shim plate 14 is sleeved on the position where the expansion steel pipe 5 passes through the steel plate wale 4, the nut 13 is pressed on the steel plate wale 4 through the steel shim plate 14, and the contact surface between the steel shim plate 14 and the nut 13 is an inclined surface adapted to the angle of the anchor hole. The steel shim plate 14 prevents the nut 13 from being subjected to an offset load.
As shown in fig. 8, in the present embodiment, the enlarged head 16 presses the steel strip 15 to form a curved surface on one side thereof, thereby providing a guiding function.
A quick forming deep foundation pit PC component support construction method comprises the following steps of:
s1, manufacturing a PC component in advance: determining the size according to construction requirements, manufacturing a prefabricated support pile 2 and a prefabricated crown beam 1 in advance in a factory, reserving a vertical grouting hole 7, a horizontal grouting hole 8 and a pre-embedded screw rod 10 on the prefabricated support pile 2, and reserving a through hole of the pre-embedded screw rod 10 on the prefabricated crown beam 2;
s2, measurement and paying-off: measuring the plane position and the elevation of the prefabricated support piles 2 around the foundation pit after lofting, and arranging a drilling machine according to the lofting position;
s3, drilling, installing and grouting the prefabricated support piles 2: the method comprises the steps of performing rotary drilling to form a hole at the position of a prefabricated support pile 2, cleaning the hole after the hole reaches the designed pile bottom elevation, immediately hoisting the prefabricated support pile 2 by a crane after the hole is cleaned, vertically inserting the prefabricated support pile 2 into a pile hole, pouring rapid-setting cement slurry under pressure through a vertical grouting hole 7 after the prefabricated support pile is in place, filling a gap between the prefabricated support pile 2 and the pile hole, and infiltrating soil around the gap to be consolidated into a whole;
s4, mounting the prefabricated crown beam 1: the prefabricated supporting piles 2 in the same row are provided with prefabricated top beams 1 at the top ends through embedded screws 10 to form integral stress;
s5, excavating a foundation pit: carrying out layered excavation on earthwork in the foundation pit, and carrying out hanging net concrete spraying treatment on the excavated bare and leaked soil body in time;
s6, installing the pile beam switching steel seat 3 and the steel plate waist beam 4: after the waist of the prefabricated support pile 2 is excavated, soil and slurry near the waist embedded screw 10 are cleaned, a protective sleeve on the waist embedded screw 10 is taken down, the pile beam switching steel seats 3 are installed on the waist of the prefabricated support pile 2 through the embedded screw 10, and the pile beam switching steel seats 3 in the same row are provided with steel plate waist beams 4 through bolts 11, so that the integral stress is enhanced;
s7, installing, pressing and grouting the expansion steel pipe 5 and the hollow anchor rod 6: drilling an anchor hole along the steel plate waist beam 4 according to the length and the inclination angle of the hollow anchor rod 6, enabling the sleeved expansion steel pipe 5 and the hollow anchor rod 6 to penetrate through the steel plate waist beam 4 and then extend into the anchor hole obliquely downwards, pushing the nut 13 on the expansion steel pipe 5 to be screwed forwards so that the steel belt 15 is expanded under the extrusion of the expansion head 16 and invades into the surrounding soil body to form a rib shape, pressure-pouring quick-setting cement paste through the grouting hole 12, and filling gaps between the soil body in the anchor hole and the surrounding soil body;
s8, excavation of a foundation pit, and dewatering and draining: continuously excavating to the bottom 9 of the foundation pit in a layered manner, making drainage measures (drainage ditches, dewatering wells and the like) of the foundation pit bottom 9, and constructing a foundation and an underground structure;
s9, foundation pit backfilling: and (3) timely carrying out layered backfilling on the foundation pit, removing the recovered pile beam switching steel seat 3 and the steel plate waist beam 4 when backfilling to the waist of the prefabricated support pile 2, and removing the recovered prefabricated crown beam 1 after backfilling to the top of the foundation pit.
In the embodiment, when the quick-setting cement slurry is pressure-poured, the slurry strength M20 is kept at 2MPa, and the grouting is finished after the pressure is stabilized for 3 min.
In this embodiment, when the longer precast crown beams 1 on one side of the foundation pit need to be continuously spliced, the adjacent precast crown beams 1 are connected through a steel plate and a hole reserved in advance.
In the invention, the PC member (precast concrete) has the advantages of standardization, integration and high forming speed, the precast support pile 2 and the precast crown beam 1 are adopted, the rapid installation and splicing can be realized, the pile foundation concrete pouring and curing processes are not needed, the construction is rapid, the stressed forming is early, the deep foundation pit foundation construction is rapidly carried out, and the construction period is greatly saved; the prefabricated support pile 2 is matched with the prefabricated crown beam pile beam 1, the adapting steel seat 3 and the steel plate waist beam 4 to form a whole, the whole is anchored with a soil body by the expansion steel pipe 5 and the hollow anchor rod 6, gaps of the soil body in the pile hole and around are filled with pressure-poured quick-setting cement paste through the vertical grouting hole 7, gaps of the soil body in the anchor hole and around are filled with pressure-poured quick-setting cement paste through the grouting hole 12, the supporting structure is safe and stable, and the working procedures are quick to join; the steel belt 15 at the tail section of the expansion steel pipe 5 is unfolded and invaded into the surrounding soil body to form an umbrella rib shape, so that the resisting force of the anchoring end is greatly enhanced; the transverse grouting holes 8 can play a role in communication when the vertical grouting holes 7 are grouted, so that annular slurry flow is promoted, and timely slurry supplement can be performed when layered excavation is performed, so that the filling effect is guaranteed; the prefabricated crown beam 1, the pile beam switching steel seat 3 and the steel plate waist beam 4 can be disassembled step by step in the process of backfilling the foundation pit step by step, the reutilization is high, and the economic applicability is good.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a quick fashioned deep basal pit PC component supporting construction which characterized in that: the prefabricated support pile comprises a prefabricated support pile, wherein the top end and the waist part of the prefabricated support pile are provided with embedded screws, the center of the prefabricated support pile is provided with a vertical grouting hole, transverse grouting holes are distributed along the vertical line, gaps between soil bodies in the pile holes and around the pile holes are filled with quick setting cement slurry through pressure pouring of the vertical grouting holes, prefabricated crown beams are installed at the top ends of the prefabricated support piles in the same row through the embedded screws, pile beam switching steel seats are installed at the waist part of the prefabricated support pile through the embedded screws, steel plate waist beams are installed on the pile beam switching steel seats in the same row through bolts, expansion steel pipes which penetrate through the steel plate waist beams and then obliquely extend into the anchor holes downwards are distributed along the steel plate waist beams, hollow anchor rods with two exposed ends penetrate through the expansion steel pipes, the tail sections of the expansion steel pipes are a plurality of separated steel belts, the first section of each hollow anchor rod is a thread section sleeved with a nut, the tail end of each hollow anchor rod is an expansion head, the center of each hollow anchor rod is a through grouting hole, the nut pushes the expansion steel pipe to move forwards so that the steel belts are expanded into an umbrella rib shape under the extrusion of the expansion head, and fast-setting cement slurry is poured into gaps between soil bodies in the anchor holes and around the anchor holes through the pressure of the grouting holes for filling.
2. The rapid prototyping deep foundation pit PC member supporting construction of claim 1 wherein: one side of the pile beam switching steel base is an arc-shaped groove attached to the prefabricated support pile, the other side of the pile beam switching steel base is a box-shaped groove, and the box-shaped groove is provided with a through hole corresponding to the embedded screw and the bolt.
3. The rapid prototyping deep foundation pit PC member supporting construction of claim 1 wherein: the expansion steel pipe penetrates through the steel plate waist beam, a steel backing plate is sleeved on the position of the expansion steel pipe penetrating through the steel plate waist beam, the nut is pressed on the steel plate waist beam through the steel backing plate, and the contact surface of the steel backing plate and the nut is an inclined surface adaptive to the angle of the anchor hole.
4. The rapid prototyping deep foundation pit PC member supporting construction of claim 1, wherein: one surface of the expanded head extruding the steel belt is a curved surface.
5. The rapid prototyping deep foundation pit PC member supporting construction of claim 1 wherein: the embedded screws at the top end of the prefabricated support pile are uniformly distributed around the axis.
6. A quick-forming deep foundation pit PC component support construction method is characterized in that: the rapidly formed deep foundation pit PC member supporting structure based on any one of claims 1 to 5, comprising the steps of:
s1, manufacturing a PC component in advance: determining the size according to construction requirements, manufacturing a prefabricated support pile and a prefabricated crown beam in advance in a factory, reserving a vertical grouting hole, a transverse grouting hole and a pre-embedded screw rod on the prefabricated support pile, and reserving a through hole of the pre-embedded screw rod on the prefabricated crown beam;
s2, measurement and paying-off: measuring the plane position and the elevation of the prefabricated support piles around the foundation pit after lofting, and arranging a drilling machine according to the lofting position;
s3, drilling, installing and grouting the prefabricated support piles: rotary excavating to form a hole at the position of the prefabricated support pile, cleaning the hole after the prefabricated support pile reaches the designed pile bottom elevation, immediately hoisting the prefabricated support pile by using a crane after the hole is cleaned, vertically inserting the prefabricated support pile into the pile hole, pressure-pouring quick-setting cement slurry through a vertical grouting hole after the prefabricated support pile is in place, filling the gap between the prefabricated support pile and the pile hole, and infiltrating into the soil body around to be consolidated into a whole;
s4, mounting the prefabricated crown beam: the prefabricated supporting piles in the same row are provided with prefabricated crown beams at the top ends through embedded screws to form integral stress;
s5, excavating a foundation pit: carrying out layered excavation on earthwork in the foundation pit, and carrying out hanging net concrete spraying treatment on the excavated bare and leaked soil body in time;
s6, installing the pile beam switching steel seat and the steel plate waist beam: after the waist of the prefabricated support pile is excavated, soil and slurry near the waist embedded screw are cleaned, a protective sleeve on the waist embedded screw is taken down, pile beam switching steel seats are installed on the waist of the prefabricated support pile through the embedded screw, and steel plate waist beams are installed on the same row of pile beam switching steel seats through bolts, so that the overall stress is enhanced;
s7, installing, pressing and grouting an expansion steel pipe and a hollow anchor rod: drilling an anchor hole along the steel plate waist beam according to the length and the inclination angle of the hollow anchor rod, enabling the sleeved expansion steel pipe and the hollow anchor rod to penetrate through the steel plate waist beam and then obliquely extend downwards into the anchor hole, pushing a nut on the expansion steel pipe and screwing the nut forwards to enable a steel belt to expand under the extrusion of an expansion head and invade a surrounding soil body to form a rib shape, pouring quick setting cement paste through the pressure of a grouting hole, and filling gaps between the soil body in the anchor hole and the surrounding soil body;
s8, excavation of a foundation pit, and dewatering and draining: continuously excavating to the bottom of the foundation pit in a layered manner, making drainage measures for the bottom of the foundation pit, and constructing a foundation and an underground structure;
s9, foundation pit backfilling: and (3) timely carrying out layered backfilling on the foundation pit, removing the recovered pile beam switching steel seat and the steel plate waist beam when backfilling to the waist of the prefabricated support pile, and removing the recovered prefabricated crown beam after backfilling to the top of the foundation pit.
7. The quick forming deep foundation pit PC member support construction method of claim 6, characterized in that: when the quick-setting cement paste is pressure-poured, the strength of the paste is M20, the 2Mpa grouting pressure is kept, and the grouting is finished after the pressure is stabilized for 3 min.
8. The quick forming deep foundation pit PC member support construction method of claim 6, characterized in that: when the longer precast crown beams on the single side of the foundation pit need to be spliced continuously, the adjacent precast crown beams are connected through a steel plate and a hole reserved in advance.
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| CN202210665975.0A CN114960673A (en) | 2022-06-13 | 2022-06-13 | Quickly-formed deep foundation pit PC (polycarbonate) component supporting structure and construction method |
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| CN202210665975.0A CN114960673A (en) | 2022-06-13 | 2022-06-13 | Quickly-formed deep foundation pit PC (polycarbonate) component supporting structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118087521A (en) * | 2024-04-25 | 2024-05-28 | 广州市市政工程试验检测有限公司 | Construction method for foundation pit support of tubular pile while drilling |
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