CN113338304A - HZ type foundation pit support structure combined with prestressed anchor cables and use method - Google Patents
HZ type foundation pit support structure combined with prestressed anchor cables and use method Download PDFInfo
- Publication number
- CN113338304A CN113338304A CN202110716713.8A CN202110716713A CN113338304A CN 113338304 A CN113338304 A CN 113338304A CN 202110716713 A CN202110716713 A CN 202110716713A CN 113338304 A CN113338304 A CN 113338304A
- Authority
- CN
- China
- Prior art keywords
- shaped steel
- steel plate
- foundation pit
- type
- pile box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 217
- 239000010959 steel Substances 0.000 claims abstract description 217
- 238000010276 construction Methods 0.000 claims abstract description 39
- 239000002689 soil Substances 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 239000003831 antifriction material Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000195626 Hanusia phi Species 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to an HZ type foundation pit enclosure structure combined with a prestressed anchor cable and a using method thereof. The Z-shaped steel plate pile box structure consists of four Z-shaped steel plate piles. The H-shaped steel is connected with the Z-shaped steel plate pile box structure through angle steel. The H-shaped steel and Z-shaped steel plate pile box structure is inserted into a natural soil layer and is perpendicular to the ring beam. The anchor cable is anchored and tensioned at the top of the ring beam. The enclosure structure provided by the invention has the functions of soil retaining and water stopping, can effectively control the deformation of the foundation pit, and has the characteristics of high rigidity, short construction period, low manufacturing cost and strong bearing capacity.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering, and particularly relates to an HZ type foundation pit support structure combined with a prestressed anchor cable and a using method thereof.
Background
With the continuous promotion of urban underground space construction in recent years, deep foundation pit engineering is increasing day by day. At present, the commonly used foundation pit enclosure forms mainly include gravity type cement soil mixing piles, SMW construction method piles, cast-in-situ bored piles, reinforced concrete sheet piles, underground continuous walls and other processes. The traditional process has long construction period and high construction cost, and the foundation pit engineering as a temporary structure cannot be recycled, thereby causing a great deal of waste of resources.
Based on the method, the steel structure foundation pit enclosure system is produced at the same time. The Z-shaped steel plate pile has the advantages of convenience and quickness in construction, recyclability, good waterproof performance and the like, but has small lateral rigidity and is less used independently in engineering projects with high requirements on the surrounding environment; h shaped steel has advantages such as the dead weight is light, lateral rigidity is big, construction speed is fast, nevertheless can only play the effect of retaining soil when the foundation ditch excavation, often need execute during the design construction and beat the waterproof curtain. The recyclable prestressed anchor cable can ensure the strength of the enclosure structure, is green and environment-friendly, has small influence on underground space, and meets the requirements of the sustainable development of the society at present. In the existing foundation pit enclosure mode, an enclosure system capable of combining the characteristics of Z-shaped steel plate piles, H-shaped steel and prestressed anchor cables is lacked, which is an important current research subject.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an HZ type foundation pit support structure combined with a prestressed anchor cable and a using method thereof. The enclosure structure has the advantages that the Z-shaped steel plate pile box structure, the H-shaped steel, the angle steel, the ring beam and the anchor cable are arranged, the advantages of the Z-shaped steel plate pile, the H-shaped steel and the prestressed anchor cable can be combined, the enclosure structure has the functions of soil retaining and water stopping, and the characteristics of high rigidity, recyclability, short construction period and high bearing capacity of the enclosure structure are realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
an HZ type foundation pit support structure combined with a prestressed anchor cable comprises a Z type steel sheet pile, H type steel, a ring beam and an anchor cable; the method is characterized in that four Z-shaped steel plate piles form a hexagonal prism-shaped Z-shaped steel plate pile box structure, and the Z-shaped steel plate pile box structure consists of four Z-shaped steel plate piles; the Z-shaped steel plate pile box-type structures are manually arranged along the circumferential direction of the foundation pit, H-shaped steel is fixedly inserted into each Z-shaped steel plate pile box-type structure in an inserting mode, the H-shaped steel is perpendicular to the circumferential direction of the foundation pit, and wing plates at two ends of the H-shaped steel are tightly attached to the inner side surfaces of two Z-shaped steel plate piles in the Z-shaped steel plate pile box-type structures; the H-shaped steel and Z-shaped steel plate pile box structure is inserted into a natural soil layer and is perpendicular to the ring beam; the anchor cable is anchored at the top of the ring beam through an anchorage device.
The axis of the Z-shaped steel plate pile box structure is a connecting line of a plurality of Z-shaped steel plate pile box structure hand-handers, and two Z-shaped steel plate piles on the lower side of the axis are welded and spliced with two Z-shaped steel plate piles on the upper side of the axis to form the Z-shaped steel plate pile box structure after a lock catch is cut off respectively.
The Z-shaped steel plate pile box structure is connected with the adjacent Z-shaped steel plate pile box structure through the lock catch.
The number ratio of the Z-shaped steel plate pile box structure to the H-shaped steel to the anchor cable is 1:1:1, and the anchor cable and the Z-shaped steel plate pile box structure are arranged at intervals.
At least one group of angle steel is welded on the inner wall of the Z-shaped steel plate pile box structure along the height direction according to the size of the H-shaped steel, the sinking verticality of the H-shaped steel can be controlled by the arrangement of the angle steel, and the distance between two angle steels in the group of angle steel is matched with the width of a wing plate of the H-shaped steel.
Before the construction of the H-shaped steel, dirt and rust on the surface need to be removed, and the friction reducer is coated immediately. The purpose of removing rust and the antifriction agent is to reduce the friction force between the H-shaped steel and the Z-shaped steel sheet pile and the soil body, so that the subsequent H-shaped steel can be conveniently pulled out and reused.
The height of the H-shaped steel pile position is 500mm higher than that of the ring beam and the Z-shaped steel plate pile box-type structure pile position, and the H-shaped steel is convenient to pull out subsequently.
An anchor cable mounting sleeve hole needs to be reserved in the ring beam, the sleeve is similar to a sleeve, a steel strand of the anchor cable penetrates through the ring beam and is fixed by an anchorage device, and the anchor cable is connected with the ring beam, the H-shaped steel and the Z-shaped steel plate pile box structure into a whole through the mounting sleeve hole.
The anchor cable comprises a free section and an anchoring section, wherein the anchoring section needs to be grouted to form grouting body.
And applying prestress to the anchor cable by stretching the free section of the anchor cable after the ring beam reaches the design strength. In the application, the anchor cable can be vertically arranged or obliquely arranged (see fig. 2 and 4), and is suitable for a vertical anchor form in occasions with higher requirements on red lines, limited sites and high environmental requirements; the oblique anchor form can provide oblique lateral force, can save bearing structure, makes things convenient for the interior construction of foundation ditch more. The inclination angle of the inclined anchor is 30-45 degrees.
The invention also provides a use method of the HZ type foundation pit support structure combined with the prestressed anchor cables, and the construction steps of the method are as follows:
(1) determining the types, lengths, positions and intervals of the Z-shaped steel sheet piles, the H-shaped steel and the anchor cables according to the engineering scale of the foundation pit, the surrounding environmental conditions and the hydrogeological conditions;
(2) leveling a construction site, and hoisting a Z-shaped steel plate pile box structure and H-shaped steel to a designed elevation by using modes of vibration pile sinking or static pile pressing and the like;
(3) constructing an anchor cable after the pile sealing of the foundation pit is finished, constructing a ring beam after the grouting of the anchor cable is finished, and reserving an installation sleeve hole of the anchor cable in the ring beam;
(4) after the strength of the ring beam reaches the design requirement, tensioning the prestress through an anchorage device so as to enable the anchor cable, the ring beam, the H-shaped steel and the Z-shaped steel plate pile box structure to form an integrated structure;
(5) excavating a soil body in the foundation pit, constructing a cushion layer, a bottom plate and a force transmission belt;
(6) and after the bottom plate and the force transmission belt reach the strength, backfilling after the underground structure is constructed to +/-0.00, and recovering the anchor cables, the H-shaped steel and the Z-shaped steel plate pile box structure.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
the invention combines the advantages of the Z-shaped steel sheet pile H-shaped steel and the prestressed anchor cable, not only maintains the characteristic of large lateral rigidity of the H-shaped steel and effectively increases the designed excavation depth, but also adopts the Z-shaped steel sheet pile box structure to ensure that the foundation pit enclosure structure has the functions of soil retaining and water stopping, simultaneously adopts the recyclable prestressed anchor cable, realizes the advantages of large rigidity, recyclability, short construction period and strong bearing capacity of the enclosure structure, avoids the defects that the lateral rigidity is smaller because the prior art uses the H, Z combined enclosure structure formed by supporting the Z-shaped steel sheet pile at one side of the H-shaped steel sheet pile, only the H-shaped steel supports the lateral water and soil pressure in the excavation process of the foundation pit, and the Z-shaped steel sheet pile only plays the role of a water-stopping curtain.
The Z-shaped steel plate pile box-type structure is box-type, so that the section modulus of the Z-shaped steel plate pile is greatly improved, and the Z-shaped steel plate pile box-type structure can be applied to deep and large foundation pit excavation engineering by matching with H-shaped steel. Meanwhile, the recyclable prestressed anchor cable is added, the strength of the supporting structure can be ensured, no support can be arranged in the foundation pit, the construction in the foundation pit is more convenient, and the construction efficiency is improved.
In conclusion, the enclosure structure provided by the invention has the functions of soil retaining and water stopping, can effectively control the deformation of the foundation pit, and has the characteristics of high rigidity, short construction period, low manufacturing cost, strong bearing capacity and the like.
Drawings
FIG. 1 is a cross-sectional view of a foundation pit support structure incorporating an oblique anchor;
FIG. 2 is a longitudinal sectional view of a foundation pit support structure combined with an oblique anchor along a lock catch between two adjacent box-type structures;
FIG. 3 is a plan view of a foundation pit support structure incorporating vertical anchors;
FIG. 4 is a longitudinal cross-sectional view of a foundation pit support structure combined with vertical anchors along a lock catch between two adjacent box-type structures;
in the figure, 1 is a ring beam; 2 is a Z-shaped steel plate pile box structure; 3 is H-shaped steel; 4 is angle steel; 5 is a Z-shaped steel sheet pile; 6 is an anchor cable; 7 is a cushion layer; 8 is a bottom plate; 9 is a force transmission belt; 10 is a lock catch; and 11 is an anchorage device.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The foundation pit engineering is used as a temporary structure, and the abandonment can be removed after the underground engineering construction is finished. Therefore, the advantage of this patent with Z shaped steel sheet pile, H shaped steel and prestressed anchorage cable fuses. The Z-shaped steel plate pile is prefabricated into a box-shaped structure, and the section modulus of the Z-shaped steel plate pile can reach 3086-12741 cm3The modulus of the section of the Z-shaped steel sheet pile is only 1200-5015 cm3M, the lateral rigidity of the enclosure structure can be greatly improved under the same condition, and the combination of the H-shaped steel and the enclosure structure can be suitable for deeperAnd (5) excavating engineering of a large foundation pit. The prestressed anchor cables are combined, so that the lateral rigidity of the enclosure structure is further increased, an inner support does not need to be arranged inside the foundation pit, the construction of an underground structure is facilitated, and the construction period is effectively shortened.
The invention relates to a novel structure form for foundation pit enclosure, which creatively aims to prefabricate a Z-shaped steel plate pile into a box-shaped structure and combine the box-shaped structure with H-shaped steel to form the novel foundation pit enclosure form with soil retaining and water stopping effects. Compared with the prior H, Z type steel sheet pile enclosure structure, the section modulus of the steel sheet pile enclosure structure is more advantageous, and the steel sheet pile enclosure structure can be suitable for deeper foundation pit excavation engineering;
the H-shaped steel, the Z-shaped steel sheet pile and the anchor cable can be recycled, the construction cost is low, the construction period is short, the influence on the adjacent underground space is small, and the requirements of sustainable development are met.
Examples
Referring to the attached drawing 1, the HZ type foundation pit support structure combined with the prestressed anchor cables comprises a Z type steel plate pile box type structure 2, H type steel 3, angle steel 4, a ring beam 1 and anchor cables 6; the Z-shaped steel plate pile box-shaped structure 2 is composed of four Z-shaped steel plate piles 5, two ends of each Z-shaped steel plate pile 5 are provided with a lock catch, two adjacent Z-shaped steel plate piles 5 are connected through the lock catches 10, the two Z-shaped steel plate piles 5 on the lower side of the axis are welded and spliced with the two piles on the upper side of the axis after one lock catch 10 is cut off from each Z-shaped steel plate pile 5, and the Z-shaped steel plate pile box-shaped structure 2 is integrally hexagonal prism-shaped; the number ratio of the Z-shaped steel plate pile box-shaped structures to the H-shaped steel to the anchor cables is 1:1:1, the anchor cables are arranged between the adjacent Z-shaped steel plate pile box-shaped structures, and the supporting structures can be omitted by considering that the soil pressure is in triangular distribution. The H-shaped steel 3 is connected with the Z-shaped steel plate pile box-shaped structures 2 through angle steel 4, H-shaped steel is arranged inside each Z-shaped steel plate pile box-shaped structure 2, and wing plates at two ends of the H-shaped steel are fixed to the centers of the inner side surfaces of the two Z-shaped steel plate piles which are connected together through lock catches; the H-shaped steel 3 and the Z-shaped steel plate pile box structure 2 are inserted into a natural soil layer and are perpendicular to the ring beam 1; the anchor cable 6 is anchored to the top of the ring beam 1 by an anchor 12.
The invention relates to an HZ type foundation pit support structure combined with a prestressed anchor cable, which comprises the following concrete steps in the construction process:
(1) determining the types, lengths, positions and intervals of a Z-shaped steel plate pile box structure 2, H-shaped steel 3 and anchor cables 6 according to the engineering scale of the foundation pit, the surrounding environmental conditions and the hydrogeological conditions;
(2) leveling a construction site, lifting the Z-shaped steel plate pile box-type structure 2 and the H-shaped steel 3 by using modes such as vibration pile sinking or static pile pressing and the like to a designed elevation, and fixing the H-shaped steel 3 with the Z-shaped steel plate pile box-type structure 2 through angle steel 4;
(3) continuously hoisting and constructing a next Z-shaped steel plate pile box structure 2 and H-shaped steel 3 along the circumferential direction of the foundation pit according to the step (2), connecting the Z-shaped steel plate pile box structure 2 constructed by construction and the Z-shaped steel plate pile box structure 2 constructed by construction in the previous step together through a lock catch, and circulating the process to the foundation pit for pile sealing, namely arranging a circle of Z-shaped steel plate pile box structure 2+ H-shaped steel 3 modular structure in the circumferential direction of the foundation pit, connecting the heads and the tails, constructing an anchor rope 6 after the pile sealing is finished, constructing the anchor rope 6 on the inner side of the foundation pit and not intersecting the Z-shaped steel plate pile box structure 2, constructing a ring beam 1 after the anchor rope is completely grouted, and reserving an installation trepanning of the anchor rope in the ring beam 1;
(4) after the strength of the ring beam 1 reaches the design requirement, tensioning the prestress through an anchorage device 11 so as to enable the anchor cable 6, the ring beam 1, the Z-shaped steel plate pile box structure 2 and the H-shaped steel 3 to form an integrated structure;
(5) excavating a soil body in a foundation pit, constructing a cushion layer 7, a bottom plate 8 and a force transmission belt 9;
(6) and after the bottom plate 8 and the force transmission belt 9 reach the strength, constructing the underground structure to +/-0.00, backfilling, recovering the anchor cables 6, the H-shaped steel 3 and the Z-shaped steel plate pile box-type structure 2, breaking the ring beam during recovery, and dragging the part with the height of the H-shaped steel, so that the H-shaped steel is pulled out from the Z-shaped steel plate pile box-type structure for recovery.
Construction example:
in this embodiment, a commercial square project is taken as an example, the excavation depth of the foundation pit is 10.2m, the perimeter of the foundation pit is about 373m, and the excavation area is about 10555m2And comprehensively determining the safety level of the engineering side wall of the foundation pit to be one grade according to the surrounding environment requirement of the engineering, the engineering geology, the hydrogeology condition and the excavation depth of the foundation pit.
The soil layer information is as follows:
the bottom of the foundation pit is positioned in the silt layer. Wherein γ is the gravity; c. phi is respectively the cohesive force and the internal friction angle of the soil layer consolidation under fast shearing.
The embodiment adopts the HZ type envelope who combines the prestressed anchorage cable to support the major structure side wall, and wherein, H shaped steel adopts 18mH 800X 300X 14X 26 type, and Z shaped steel sheet pile adopts 18mWRZ30-635 type, and the angle steel adopts L50X 6 equilateral angle steel, and two angle steels are a set of, and two angle steels are the same height setting, and the space of two parcels can hold the pterygoid lamina of H shaped steel just, restriction H shaped steel straightness that hangs down that sinks. Several groups of angle steels can be arranged in the height direction of the inner wall of the Z-shaped steel plate pile, so that the perpendicularity of the H-shaped steel is guaranteed, and the horizontal coordinates of the multiple groups of angle steels on one side are the same. The anchor cable adopts 21m 3 steel stranded wires with the diameter of phi S15.2, the inclination angle is 30 degrees, the diameter of a formed hole is phi 400mm, the length of the anchored segment is 12m, the length of a free segment is 9m, and the pre-applied axial force is 80.00 kN/m. The construction cost is about 360 thousands, and the construction period is four months; compared with the enclosure form (the construction cost is about 500 ten thousand, the construction period is seven months) of the traditional technology cast-in-place pile and the water stop pile combined with two inner supports, the construction cost is saved by about 30%, and the construction period is saved by three months. The concrete construction steps are as follows:
and 8, after the bottom plate and the force transmission belt reach the strength, backfilling after the underground structure is constructed to +/-0.00, and recovering the anchor cable, the H-shaped steel and the Z-shaped steel plate pile box structure.
Nothing in this specification is said to apply to the prior art.
Claims (8)
1. An HZ type foundation pit support structure combined with a prestressed anchor cable comprises a Z type steel sheet pile, H type steel, a ring beam and an anchor cable; the method is characterized in that four Z-shaped steel plate piles form a hexagonal prism-shaped Z-shaped steel plate pile box structure, and the Z-shaped steel plate pile box structure consists of four Z-shaped steel plate piles; the Z-shaped steel plate pile box-type structures are manually arranged along the circumferential direction of the foundation pit, H-shaped steel is fixedly inserted into each Z-shaped steel plate pile box-type structure in an inserting mode, the H-shaped steel is perpendicular to the circumferential direction of the foundation pit, and wing plates at two ends of the H-shaped steel are tightly attached to the inner side surfaces of two Z-shaped steel plate piles in the Z-shaped steel plate pile box-type structures; the H-shaped steel and Z-shaped steel plate pile box structure is inserted into a natural soil layer and is perpendicular to the ring beam; the anchor cable is anchored at the top of the ring beam through an anchorage device.
2. The HZ type foundation pit support structure combined with the prestressed anchor cable of claim 1, wherein the axis of the Z type steel plate pile box structure is a connecting line of a plurality of Z type steel plate pile box structure hand-handgrips, and two Z type steel plate piles at the lower side of the axis are welded and spliced with two Z type steel plate piles at the upper side of the axis to form a Z type steel plate pile box structure after a lock catch is cut off.
3. The HZ type foundation pit enclosure structure combined with the prestressed anchor cables of claim 1, wherein the Z type steel sheet pile box type structure is connected with the adjacent Z type steel sheet pile box type structure through a lock catch.
4. The HZ foundation pit support structure combined with the prestressed anchor cables as claimed in claim 1, wherein the number ratio of the Z-shaped steel plate pile box structure to the H-shaped steel to the anchor cables is 1:1:1, and the anchor cables are arranged at intervals with the Z-shaped steel plate pile box structure.
5. The HZ foundation pit support structure combined with the prestressed anchor cables as claimed in claim 1, wherein at least one set of angle steel is welded on the inner wall of the Z-shaped steel plate pile box structure along the height direction according to the size of the H-shaped steel, the angle steel is arranged to control the sinking verticality of the H-shaped steel, and the distance between two angle steels in the set of angle steel is matched with the width of a wing plate of the H-shaped steel; before the H-shaped steel is constructed, dirt and rust on the surface need to be removed, and an antifriction agent is coated immediately; the height of the H-shaped steel pile is 500mm higher than that of the ring beam and the Z-shaped steel plate pile box structure.
6. The HZ foundation pit support structure combined with the prestressed anchor cables as claimed in claim 1, wherein an anchor cable installation sleeve hole is reserved in the ring beam, the anchor cable is connected with the ring beam, the H-shaped steel and the Z-shaped steel plate pile box type structure into a whole through the installation sleeve hole, the anchor cable comprises a free section and an anchoring section, and the anchoring section is grouted to form grouting body; and applying prestress to the anchor cable by stretching the free section of the anchor cable after the ring beam reaches the design strength.
7. A use method of an HZ type foundation pit support structure combined with a prestressed anchor cable comprises the following construction steps:
(1) determining the type, length, position and spacing of a Z-shaped steel plate pile box structure, H-shaped steel and anchor cables according to the foundation pit engineering scale, the surrounding environmental conditions and the hydrogeological conditions;
(2) leveling a construction site, and hoisting a Z-shaped steel plate pile box structure and H-shaped steel to a designed elevation in a vibration pile sinking or static pile pressing mode;
(3) constructing an anchor cable after the pile sealing of the foundation pit is finished, constructing a ring beam after the grouting of the anchor cable is finished, and reserving an installation sleeve hole of the anchor cable in the ring beam;
(4) after the strength of the ring beam reaches the design requirement, tensioning the prestress through an anchorage device so as to enable the anchor cable, the ring beam, the H-shaped steel and the Z-shaped steel plate pile box structure to form an integrated structure;
(5) excavating a soil body in the foundation pit, constructing a cushion layer, a bottom plate and a force transmission belt;
(6) and after the bottom plate and the force transmission belt reach the strength, backfilling after the underground structure is constructed to +/-0.00, and recovering the anchor cables, the H-shaped steel and the Z-shaped steel plate pile box structure.
8. The use method of claim 7, wherein the anchor cable is a slant anchor or a vertical anchor, and the inclination angle of the slant anchor is 30-45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110716713.8A CN113338304A (en) | 2021-06-28 | 2021-06-28 | HZ type foundation pit support structure combined with prestressed anchor cables and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110716713.8A CN113338304A (en) | 2021-06-28 | 2021-06-28 | HZ type foundation pit support structure combined with prestressed anchor cables and use method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113338304A true CN113338304A (en) | 2021-09-03 |
Family
ID=77478991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110716713.8A Withdrawn CN113338304A (en) | 2021-06-28 | 2021-06-28 | HZ type foundation pit support structure combined with prestressed anchor cables and use method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113338304A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09328755A (en) * | 1996-06-12 | 1997-12-22 | Nippon Steel Metal Prod Co Ltd | Soil retaining panel for trench out construction method |
| CN201746844U (en) * | 2010-06-13 | 2011-02-16 | 中铁二十二局集团第六工程有限公司 | Composite steel sheet piling cofferdam construction system |
| CN202559362U (en) * | 2012-04-09 | 2012-11-28 | 东南大学 | Double-row steel sheet pile and H-steel section combined foundation pit supporting structure |
| CN103758134A (en) * | 2014-01-24 | 2014-04-30 | 中国建筑股份有限公司 | Combined double-row pile supporting system and construction method thereof |
| CN105714831A (en) * | 2016-02-03 | 2016-06-29 | 华侨大学 | Abnormal-shape double-row pile for supporting foundation pit side wall and construction method of abnormal-shape double-row pile |
| CN108265726A (en) * | 2017-01-04 | 2018-07-10 | 上海城地建设股份有限公司 | Support, anchor cable post-tensioning HU types building enclosure and its application process before a kind of steel pipe |
| CN217150258U (en) * | 2021-06-28 | 2022-08-09 | 河北工业大学 | HZ type foundation pit retaining structure who combines prestressed anchorage cable |
-
2021
- 2021-06-28 CN CN202110716713.8A patent/CN113338304A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09328755A (en) * | 1996-06-12 | 1997-12-22 | Nippon Steel Metal Prod Co Ltd | Soil retaining panel for trench out construction method |
| CN201746844U (en) * | 2010-06-13 | 2011-02-16 | 中铁二十二局集团第六工程有限公司 | Composite steel sheet piling cofferdam construction system |
| CN202559362U (en) * | 2012-04-09 | 2012-11-28 | 东南大学 | Double-row steel sheet pile and H-steel section combined foundation pit supporting structure |
| CN103758134A (en) * | 2014-01-24 | 2014-04-30 | 中国建筑股份有限公司 | Combined double-row pile supporting system and construction method thereof |
| CN105714831A (en) * | 2016-02-03 | 2016-06-29 | 华侨大学 | Abnormal-shape double-row pile for supporting foundation pit side wall and construction method of abnormal-shape double-row pile |
| CN108265726A (en) * | 2017-01-04 | 2018-07-10 | 上海城地建设股份有限公司 | Support, anchor cable post-tensioning HU types building enclosure and its application process before a kind of steel pipe |
| CN217150258U (en) * | 2021-06-28 | 2022-08-09 | 河北工业大学 | HZ type foundation pit retaining structure who combines prestressed anchorage cable |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111335327B (en) | Deep anchor pile supporting system and construction method thereof | |
| CN203475440U (en) | SMW stiffened wall inclined-supporting combined space enclosing structure for foundation pit | |
| CN111560962A (en) | Backfill area foundation pit supporting structure and construction method thereof | |
| CN111119198A (en) | A reinforced structure that is used for SMW worker method stake to strut system | |
| CN113529738A (en) | Anchor-pull type supporting system based on horizontal anchor cables and counter-force piles and construction method thereof | |
| CN104532856A (en) | Fabricated lattice unit for foundation pit supporting and installation method | |
| CN217150258U (en) | HZ type foundation pit retaining structure who combines prestressed anchorage cable | |
| CN111411630A (en) | Supporting method for local deepened area in deep foundation pit | |
| CN112982472B (en) | Power transmission tower foundation structure suitable for regions without bedrock and construction method | |
| CN212104116U (en) | Deep anchor pile supporting system | |
| CN201077988Y (en) | Hidden beam-column type prestressing force earth nail wall | |
| JP2004285735A (en) | Method of constructing temporary landing bridge by using truss frame | |
| CN108035360A (en) | A kind of method for pattern foundation pit supporting structure | |
| CN113338304A (en) | HZ type foundation pit support structure combined with prestressed anchor cables and use method | |
| CN115717397A (en) | Larsen steel sheet pile and prestressed anchor cable combined supporting construction method | |
| CN215977295U (en) | Foundation pit supporting structure | |
| CN216689422U (en) | Recoverable prestress supporting system | |
| CN113090066A (en) | Construction method for newly added entrances and exits of existing buildings and elevator shaft | |
| CN115387207A (en) | Shallow covering layer steel-concrete composite pile pier structure and construction method | |
| CN204435389U (en) | A kind of assembled lattice unit for pattern foundation pit supporting structure | |
| CN210562210U (en) | High ground water level underground structure in weak soil area | |
| JP2002088785A (en) | Continuous construction method for precast concrete column wall member | |
| CN212270945U (en) | Existing railway line foundation pit supporting system | |
| CN106988327A (en) | A kind of upright controling slip casting steel floral tube pile base beam barrier wall structure and its construction method | |
| CN217174817U (en) | Composite supporting system for deep and large foundation pit in complex soil layer environment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210903 |