CN111794247A - Foundation pit supporting structure and construction method thereof - Google Patents

Foundation pit supporting structure and construction method thereof Download PDF

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Publication number
CN111794247A
CN111794247A CN202010739124.7A CN202010739124A CN111794247A CN 111794247 A CN111794247 A CN 111794247A CN 202010739124 A CN202010739124 A CN 202010739124A CN 111794247 A CN111794247 A CN 111794247A
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CN
China
Prior art keywords
foundation pit
supporting
piece
anchor cable
pit supporting
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Granted
Application number
CN202010739124.7A
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Chinese (zh)
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CN111794247B (en
Inventor
杨金凡
刘来俊
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Guangdong Wanxin Construction Engineering Technology Co ltd
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Guangdong Wanxin Construction Engineering Technology Co ltd
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Priority to CN202010739124.7A priority Critical patent/CN111794247B/en
Publication of CN111794247A publication Critical patent/CN111794247A/en
Application granted granted Critical
Publication of CN111794247B publication Critical patent/CN111794247B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74Means for anchoring structural elements or bulkheads
    • E02D5/76Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0046Production methods using prestressing techniques
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00Miscellaneous
    • E02D2600/30Miscellaneous comprising anchoring details

Abstract

The application relates to the field of building construction, in particular to a foundation pit supporting structure and a construction method thereof, wherein the foundation pit supporting structure comprises a supporting layer and a supporting assembly; the supporting layer is formed by connecting a plurality of cast-in-place piles; the supporting assembly comprises a connecting portion fixedly connected to the cast-in-place pile and a supporting portion used for supporting the connecting portion, the connecting portion is formed by a plurality of end-to-end splicing blocks, a clamping block extends from one side of each splicing block, and a clamping groove matched with the clamping block of the adjacent splicing block is formed in one side, away from the clamping block, of each splicing block. The construction method has the advantages of being convenient for site construction and accelerating construction progress.

Description

Foundation pit supporting structure and construction method thereof
Technical Field
The application relates to the field of building construction, in particular to a foundation pit supporting structure and a construction method thereof.
Background
In building construction, a foundation pit is usually excavated, the foundation pit is an earth pit excavated at a base design position according to the base elevation and the base plane size, and the foundation pit is mainly used for bearing platforms, bridge abutments and foundation expansion construction. The foundation pit support refers to measures of temporary retaining, reinforcing, protecting and underground water controlling adopted for protecting the safety of the construction of an underground main structure and the surrounding environment of the foundation pit.
The connecting block can be pour at the middle part of a fender pile usually to current excavation supporting construction, and current connecting block is one shot forming, because the great of foundation ditch, is difficult for constructing when leading to pouring the connecting block.
Disclosure of Invention
In order to facilitate field construction and accelerate the construction progress, the application provides a foundation pit supporting structure and a construction method thereof.
In a first aspect, the present application provides a foundation pit supporting structure, which adopts the following technical scheme:
a foundation pit supporting structure comprises a supporting layer and a supporting component;
the supporting layer is formed by connecting a plurality of cast-in-place piles;
the supporting assembly comprises a connecting portion fixedly connected to the cast-in-place pile and a supporting portion used for supporting the connecting portion, the connecting portion is formed by a plurality of end-to-end splicing blocks, a clamping block extends from one side of each splicing block, and a clamping groove matched with the clamping block of the adjacent splicing block is formed in one side, away from the clamping block, of each splicing block.
Through adopting above-mentioned technical scheme, when using this excavation supporting construction, splice through joint piece and joint groove cooperation concatenation between the piece, need not one shot forming to be convenient for be under construction, simultaneously, splice through joint piece and joint groove cooperation joint between the piece adjacent, make to be difficult for breaking away from the laminating between the adjacent piece.
Preferably, one end of the clamping block, which is far away from the splicing block, is a bending part.
Through adopting above-mentioned technical scheme, joint piece one end is bent and is L shape, after the joint between joint piece and the joint groove, is difficult for breaking away from.
Preferably, the supporting part comprises a connecting rod and an inclined strut, an inclined plane is arranged on the upper end face of the inclined strut and faces towards the connecting part, one end of the connecting rod is connected with the connecting part, and the other end of the connecting rod is fixedly connected with the inclined plane.
Through adopting above-mentioned technical scheme, the power transmission of connecting rod to the bracing, the bracing sets up inclined plane and connecting rod contact to make the contact surface increase between connecting rod and the bracing, thereby reduce the pressure of contact surface between two parts, extend the life of connecting rod and bracing.
Preferably, a horizontal rod is arranged on one side, away from the splicing blocks, of the splicing blocks, a rotating ball is arranged at one end, away from the splicing blocks, of the horizontal rod, a rotating ring is arranged at one end, away from the inclined strut, of the connecting rod, and the rotating ball is rotatably embedded in the rotating ring.
By adopting the technical scheme, the angle between the splicing blocks and the connecting rod can be adjusted, and construction is facilitated.
Preferably, the connecting part is provided with a prestressed anchor cable in a penetrating way, and the prestressed anchor cable is formed by twisting a plurality of steel ropes.
Through adopting above-mentioned technical scheme, the prestressed anchorage cable is used for consolidating the rock mass, improves the atress that keeps off the soil campshed simultaneously to make whole supporting construction more reliable and stable, the prestressed anchorage cable passes through a plurality of steel cable transposition formation, makes the prestressed anchorage cable not fragile.
Preferably, one end of the prestressed anchor cable extends out of the splicing block, one end of the prestressed anchor cable extending out of the splicing block is a threaded section, and a pre-tightening nut is connected to the threaded section in a threaded manner.
By adopting the technical scheme, the position of the pre-tightening nut is limited in the construction process, then the pre-tightening nut is rotated, so that the pre-stressed anchor cable moves towards the direction far away from the splicing block, pre-stress is applied to the pre-stressed anchor cable, the pre-stress is used for improving the service performance of the structure, the pre-stress is applied to the supporting structure in advance during construction, the pre-stress can fully or partially offset the tensile stress caused by load during service of the structure, and the structural damage is avoided.
Preferably, the horizontal rod is connected with a jacking piece in a sliding mode, and the jacking piece is used for limiting the pre-tightening nut.
Through adopting above-mentioned technical scheme, set up a position spare, carry on spacingly for the position of pretension nut through pushing up, need not operating personnel and use other instruments to carry on spacingly to pretension nut to simplify construction operation, shorten engineering time.
Preferably, the upper end face of the horizontal rod is provided with a sliding groove, the lower end of the top part is connected with the sliding groove in a sliding manner, and the horizontal rod is provided with a locking part for locking the top part.
Through adopting above-mentioned technical scheme, top position spare slides through sliding groove and horizon bar and is connected.
Preferably, the retaining member is a locking bolt, the side wall of the horizontal rod is provided with a strip-shaped through hole penetrating through the sliding groove, and the locking bolt penetrates through the strip-shaped through hole and is in threaded connection with the jacking member.
Through adopting above-mentioned technical scheme, when a position spare cunning move to with pretension nut butt, screw up the locking bolt and will push up the position spare locking in order to realize the locking function.
In a second aspect, the application provides a construction method of a foundation pit supporting structure, which adopts the following technical scheme:
a construction method of a foundation pit supporting structure comprises the following steps,
s1, leveling the field;
s2, constructing the cast-in-situ bored pile according to the construction specification to form a supporting layer;
s3, constructing splicing blocks on the supporting layer;
s4, penetrating a pre-stressed anchor cable;
s5, constructing a building main body bottom plate at the bottom of the foundation pit, constructing a concrete support on the bottom plate of the building main body and installing an inclined strut;
s6, mounting horizontal rods on the splicing blocks, and mounting jacking pieces on the horizontal rods;
s7, installing a connecting rod between the inclined strut and the horizontal rod;
s8, pre-stretching the pre-stressed anchor cable;
s9, testing and quality inspection.
Through adopting above-mentioned technical scheme, realize the construction of above-mentioned foundation ditch supporting construction.
In summary, the present application includes at least one of the following beneficial technical effects:
when the foundation pit supporting structure is used, the splicing blocks are spliced in a matched mode through the clamping blocks and the clamping grooves, one-time forming is not needed, construction is facilitated, and meanwhile, the adjacent splicing blocks are clamped in a matched mode through the clamping blocks and the clamping grooves, so that the adjacent splicing blocks are not prone to being separated from attachment;
the inclined plane of the inclined strut is in contact with the connecting rod, so that the contact surface between the connecting rod and the inclined strut is increased, the pressure of the contact surface between the two parts is reduced, and the service lives of the connecting rod and the inclined strut are prolonged;
the prestressed anchor cable is formed by twisting a plurality of steel ropes, so that the prestressed anchor cable is not easy to damage.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of an excavation supporting structure according to the present application.
Figure 2 is a schematic illustration of a retaining assembly of an embodiment of an excavation retaining structure of the present application.
Description of reference numerals: 1. a supporting layer; 11. filling piles; 2. a support assembly; 21. a connecting portion; 211. splicing blocks; 2111. a clamping block; 2112. a clamping groove; 22. a support section; 221. a connecting rod; 2211. a rotating ring; 222. bracing; 2221. an inclined surface; 223. a concrete support; 224. a horizontal bar; 2241. rotating the ball; 2242. a sliding groove; 225. a pre-stressed anchor cable; 2251. pre-tightening the nut; 2252. a threaded segment; 226. a top position member; 2261. a sliding part; 2262. a top-position part; 227. and a locking member.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a foundation ditch supporting construction. Referring to fig. 1, an excavation supporting structure includes a supporting layer 1 and a supporting member 2. Wherein, the supporting layer 1 is formed by connecting a plurality of cast-in-place piles 11, and the cast-in-place piles 11 are mutually meshed and connected.
Referring to fig. 1 and 2, specifically, the supporting assembly 2 includes a connecting portion 21 fixedly connected to the cast-in-place pile 11 and a supporting portion 22 for supporting the connecting portion 21, the connecting portion 21 is formed by a plurality of end-to-end connected splicing blocks 211, a clamping block 2111 extends from one side of each splicing block 211, and a clamping groove 2112 matched with the clamping block 2111 of the adjacent splicing block 211 is arranged on one side of each splicing block 211 away from the clamping block 2111.
Referring to fig. 1 and 2, further, one end of the clamping block 2111 away from the splicing block 211 is a bent portion, the clamping block 2111 is L-shaped, and the clamping groove 2112 cooperates with the clamping block 2111 to form an L-shape. One end of the clamping block 2111 is bent to be L-shaped, and after the clamping block 2111 and the clamping groove 2112 are clamped, the clamping block is not easy to separate.
The structure of the retaining portion 22 will be described in detail below. Referring to fig. 1 and 2, the support part 22 includes a connection rod 221 and an inclined strut 222, an inclined surface 2221 is provided on an upper end surface of the inclined strut 222, the inclined surface 2221 faces the connection part 21, one end of the connection rod 221 is connected to the connection part 21, and the other end of the connection rod 221 is fixedly connected to the inclined surface 2221. The force of the connecting rod 221 is transmitted to the inclined strut 222, and the inclined strut 222 is provided with the inclined surface 2221 to be in contact with the connecting rod 221, so that the contact surface between the connecting rod 221 and the inclined strut 222 is increased, the pressure of the contact surface between the two components is reduced, and the service life of the connecting rod 221 and the inclined strut 222 is prolonged.
The inclined strut 222 is fixedly installed on the concrete support 223, and the concrete support 223 is fixedly installed on the ground through bolts. Further, an included angle between the inclined plane 2221 and the horizontal plane may be set to 30 ° to 45 °, when the included angle between the inclined plane 2221 and the horizontal plane is less than 30 °, a component force of the support force of the connecting rod 221 to the inclined strut 222 in the vertical direction is large, so that the concrete support 223 is easily damaged, and meanwhile, a projection distance of the inclined strut 222 on the vertical plane becomes large, a bending moment generated by the same size of the component force of the support layer to the horizontal direction of the connecting rod 221 and the component force of the inclined strut 222 to the horizontal direction of the connecting rod 221 to the inclined strut 222 becomes large, so that the inclined strut 222 is easily damaged; when the inclined surface 2221 forms an angle greater than 45 ° with the horizontal plane, the component force of the supporting force of the connecting rod 221 to the sprag 222 in the horizontal direction is large, so that the connecting rod 221 and the sprag 222 are easily separated, and the angle formed by the inclined surface 2221 and the horizontal plane is selected to be 30 ° to 45 °.
Referring to fig. 1 and 2, a horizontal rod 224 is fixedly connected to a side of the splicing block 211 away from the splicing block 211, a rotating ball 2241 is arranged at one end of the horizontal rod 224 away from the splicing block 211, a rotating ring 2211 is arranged at one end of the connecting rod 221 away from the inclined strut 222, and the rotating ball 2241 is rotatably embedded in the rotating ring 2211. The angle between the splicing block 211 and the connecting rod 221 can be adjusted, and construction is facilitated.
Referring to fig. 1 and 2, the connecting portion 21 is formed by passing a pre-stressed anchor cable 225 through the connecting portion, and the pre-stressed anchor cable 225 is formed by twisting a plurality of steel cables. The prestressed anchor cable 225 is used for reinforcing rock mass and improving the stress of the retaining row pile, so that the whole supporting structure is more stable and reliable, and compared with the parallel steel ropes, the mechanical performance of the twisted prestressed anchor cable 225 has more bending resistance.
With continued reference to fig. 1 and 2, one end of the prestressed anchor cable 225 extends out of the splice 211, one end of the prestressed anchor cable 225 extending out of the splice 211 is a threaded section 2252, and a pre-tightening nut 2251 is threadedly connected to the threaded section 2252. In the construction process, the position of the pre-tightening nut 2251 is limited, then the pre-tightening nut 2251 is rotated to move the pre-stressed anchor cable 225 towards the direction away from the splicing block 211, pre-stress is applied to the pre-stressed anchor cable 225, the pre-stress is to improve the service performance of the structure, compressive stress is applied to the supporting structure in advance during construction, the compressive stress can fully or partially offset tensile stress caused by load during service of the structure, and structural damage is avoided.
Referring to fig. 1 and 2, further, a top member 226 is slidably connected to the horizontal rod 224, and the top member 226 is used for limiting the pre-tightening nut 2251. The position of the pre-tightening nut 2251 is limited by the aid of the jacking piece 226, so that an operator does not need to limit the pre-tightening nut 2251 by using other tools, construction operation is simplified, and construction time is shortened.
Referring to fig. 1 and 2, in the illustrated embodiment, the horizontal bar 224 is provided with a sliding slot 2242 on the upper end surface, the lower end of the jacking member 226 is slidably connected with the sliding slot 2242, the horizontal bar 224 is provided with a locking member 227 for locking the jacking member 226, and the jacking member 226 is slidably connected with the horizontal bar 224 through the sliding slot 2242. The propping member 226 includes a sliding portion 2261 and a propping portion 2262, the sliding portion 2261 is slidably disposed in the sliding groove 2242, the sliding portion 2261 forms the propping portion 2262 toward two parallel rods extending from the sliding portion 2261, the propping portion 2262 is disposed obliquely, and an axis of the rod of the propping portion 2262 is perpendicular to an axial direction of the prestressed anchor cable 225.
Referring to fig. 1 and 2, in this embodiment, the locking member 227 is a locking bolt, a through bar-shaped hole penetrating through the sliding groove 2242 is formed in a side wall of the horizontal rod 224, and the locking bolt penetrates through the through bar-shaped hole and is in threaded connection with the top member 226. When the top member 226 slides into abutment with the pre-tightening nut 2251, tightening the locking bolt locks the top member 226 for a locking function.
The implementation principle of the foundation pit supporting structure in the embodiment of the application is as follows: when the foundation pit supporting structure is used, the splicing blocks 211 are spliced in a matched mode through the clamping blocks 2111 and the clamping grooves 2112, one-time forming is not needed, construction is facilitated, and meanwhile the adjacent splicing blocks 211 are clamped in a matched mode through the clamping blocks 2111 and the clamping grooves 2112, so that the adjacent splicing blocks 211 are not prone to being separated from being attached.
The embodiment of the application also discloses a construction method of the foundation pit supporting structure. A construction method of a foundation pit supporting structure comprises the following steps:
s1, leveling the field to a designed elevation, excavating a mixing pile construction guide groove and removing obstacles;
s2, constructing the cast-in-situ bored pile 11 according to the construction specification to form a supporting layer 1;
s3, excavating the foundation pit to a half of the depth of the foundation pit, placing a pouring mold to pour the splicing blocks 211 on the supporting layer 1, and excavating the foundation pit to a designed depth;
s4, penetrating the pre-stressed anchor cable 225 through the splicing block 211 and the support layer 1;
s5, constructing a building main body bottom plate at the bottom of the foundation pit, constructing a concrete support 223 on the building main body bottom plate and installing an inclined strut 222;
s6, mounting a horizontal rod 224 on the splicing block 211, fixing the horizontal rod 224 on the splicing block 211 through bolts, and then mounting a top position piece 226 on the horizontal rod 224;
s7, installing a connecting rod 221 between the inclined strut 222 and the horizontal rod 224;
s8, pre-stretching the pre-stressed anchor cable 225;
s9, testing and quality inspection.
By the construction method, the construction of the foundation pit supporting structure is realized.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides a foundation ditch supporting construction which characterized in that: comprises a supporting layer (1) and a supporting component (2);
the supporting layer (1) is formed by connecting a plurality of cast-in-place piles (11);
support subassembly (2) including fixed connection in connecting portion (21) on bored concrete pile (11) and be used for supporting the portion (22) of strutting of connecting portion (21), connecting portion (21) are a plurality of end to end's concatenation piece (211) formation, concatenation piece (211) one side extends there is joint piece (2111), one side that concatenation piece (211) was kept away from joint piece (2111) is provided with joint piece (2111) complex joint groove (2112) with adjacent concatenation piece (211).
2. A foundation pit supporting construction according to claim 1, wherein: one end, far away from the splicing block (211), of the clamping block (2111) is a bending part.
3. A foundation pit supporting construction according to claim 2, wherein: the supporting part (22) comprises a connecting rod (221) and an inclined strut (222), an inclined surface (2221) is arranged on the upper end surface of the inclined strut (222), the inclined surface (2221) faces the connecting part (21), one end of the connecting rod (221) is connected with the connecting part (21), and the other end of the connecting rod (221) is fixedly connected with the inclined surface (2221).
4. A foundation pit supporting construction according to claim 3, wherein: one side of the splicing block (211) far away from the splicing block (211) is provided with a horizontal rod (224), one end of the horizontal rod (224) far away from the splicing block (211) is provided with a rotating ball (2241), one end of the connecting rod (221) far away from the inclined strut (222) is provided with a rotating ring (2211), and the rotating ball (2241) is rotatably embedded in the rotating ring (2211).
5. A foundation pit supporting construction according to claim 4, wherein: the connecting part (21) is provided with a pre-stressed anchor cable (225) in a penetrating mode, and the pre-stressed anchor cable (225) is formed by twisting a plurality of steel ropes.
6. A foundation pit supporting construction according to claim 5, wherein: one end of the prestressed anchor cable (225) extends out of the splicing block (211), one end of the prestressed anchor cable (225) extending out of the splicing block (211) is a threaded section (2252), and a pre-tightening nut (2251) is in threaded connection with the threaded section (2252).
7. A foundation pit supporting construction according to claim 6, wherein: the horizontal rod (224) is connected with a jacking piece (226) in a sliding mode, and the jacking piece (226) is used for limiting the pre-tightening nut (2251).
8. A foundation pit supporting construction according to claim 7, wherein: horizontal pole (224) up end is opened there is groove (2242) that slides, top position spare (226) lower extreme with the groove (2242) that slides is connected, be provided with the locking on horizontal pole (224) retaining member (227) of top position spare (226).
9. A foundation pit supporting construction according to claim 8, wherein: retaining member (227) are locking bolt, level bar (224) lateral wall be provided with the bar through-hole that slides groove (2242) and run through, locking bolt runs through the bar through-hole with top position piece (226) threaded connection.
10. A construction method of a foundation pit supporting structure is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
s1, leveling the field;
s2, constructing the cast-in-situ bored pile (11) according to the construction specification to form a supporting layer (1);
s3, constructing splicing blocks (211) on the supporting layer (1);
s4, a pre-stressed anchor cable (225) is arranged in a penetrating mode;
s5, constructing a building main body bottom plate at the bottom of the foundation pit, constructing a concrete support (223) on the building main body bottom plate and installing an inclined strut (222);
s6, mounting a horizontal rod (224) on the splicing block (211), and mounting a top position piece (226) on the horizontal rod (224);
s7, installing a connecting rod (221) between the inclined strut (222) and the horizontal rod (224);
s8, pre-stretching the pre-stressed anchor cable (225);
s9, testing and quality inspection.
CN202010739124.7A 2020-07-28 2020-07-28 Foundation pit supporting structure and construction method thereof Active CN111794247B (en)

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN112779915A (en) * 2021-01-15 2021-05-11 湖北理工学院 Steel support prestress loading and unloading device for foundation pit supporting engineering
CN113431054A (en) * 2021-08-05 2021-09-24 广东中都建筑集团有限公司 Pile bottom curing diagonal bracing pile foundation pit supporting construction method adopting static pressure implantation method

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CN110486070A (en) * 2019-09-19 2019-11-22 武威 A kind of constructing structure of the prestressed anchor of tunnel or Culvert engineering
CN111350193A (en) * 2018-12-21 2020-06-30 中冶天工集团有限公司 Open type foundation pit supporting method
CN210917394U (en) * 2019-10-30 2020-07-03 惠州市新业建筑工程有限公司 Foundation pit support pile

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CN103343532A (en) * 2013-07-05 2013-10-09 郭红标 Pre-stressed anchor cable pile-slab wall
CN205742213U (en) * 2016-04-29 2016-11-30 广州市第一建筑工程有限公司 Foundation pit supporting construction
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CN108222014A (en) * 2018-01-17 2018-06-29 启东市建筑设计院有限公司 A kind of rock bolt device and the foundation pit supporting construction with the device
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112779915A (en) * 2021-01-15 2021-05-11 湖北理工学院 Steel support prestress loading and unloading device for foundation pit supporting engineering
CN113431054A (en) * 2021-08-05 2021-09-24 广东中都建筑集团有限公司 Pile bottom curing diagonal bracing pile foundation pit supporting construction method adopting static pressure implantation method
CN113431054B (en) * 2021-08-05 2022-07-05 广东中都建筑集团有限公司 Pile bottom curing inclined support pile foundation pit supporting construction method adopting static pressure implantation method

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