CN113863322A - Fish-belly sill anchor pulling supporting structure and construction method thereof - Google Patents
Fish-belly sill anchor pulling supporting structure and construction method thereof Download PDFInfo
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- CN113863322A CN113863322A CN202111259496.0A CN202111259496A CN113863322A CN 113863322 A CN113863322 A CN 113863322A CN 202111259496 A CN202111259496 A CN 202111259496A CN 113863322 A CN113863322 A CN 113863322A
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- anchor
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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
-
- 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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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a pull-anchor supporting structure, in particular to a fish-bellied beam pull-anchor supporting structure and a construction method thereof, wherein the fish-bellied beam pull-anchor supporting structure is convenient to stretch, large in anchor rod spacing and strong in supporting capacity. Including the foundation ditch, the stock, the steel encloses the purlin and encloses the backplate, enclose the backplate and establish on the inside wall of foundation ditch, the stock interval is inserted on enclosing the backplate and is stretched into the foundation ditch inside wall, the steel encloses the purlin level and establishes on enclosing the backplate, stock one end encloses the purlin with the steel and is connected, the steel encloses the purlin and goes up the interval and be equipped with ground tackle subassembly, all be equipped with the stretch-draw backing plate on the ground tackle subassembly, the both sides of stretch-draw backing plate all are equipped with steel strand wires ground tackle, all be equipped with steel strand wires between the steel strand wires ground tackle, equal interval is equipped with the vaulting pole of being connected with the steel purlin between per two adjacent ground tackle subassemblies. According to the invention, the tensile force of the anchor rod directly acts on the steel enclosing purlin between the anchor rods through the steel strand and the support rod, so that the transmission ratio of the tensile force of the anchor rod to the span of the steel enclosing purlin is improved, and the problem of weak supporting force between the anchors in the existing anchor pulling supporting technology is solved.
Description
Technical Field
The invention relates to a pull-anchor supporting structure, in particular to a fish-bellied beam pull-anchor supporting structure and a construction method thereof, wherein the fish-bellied beam pull-anchor supporting structure is convenient to stretch, large in anchor rod spacing and strong in supporting capacity.
Background
The anchor pulling supporting structure is a commonly used supporting form in foundation pit engineering and comprises an anchor rod and a steel surrounding purlin; the arrangement distance of the anchor rods has important influence on the anchoring characteristics of the anchor rods, the group anchor effect caused by interaction between the anchor rods can be weakened by expanding the distance of the anchor rods, and the ultimate uplift bearing capacity of the anchor rods is improved; in addition, when a building or an underground structure with a natural foundation exists above the ground layer penetrated by the anchor rods, the distance between the anchor rods needs to be enlarged so as to avoid the ground layer which is easy to collapse and deform; the supporting effect of the conventional anchor pulling supporting structure is concentrated around the anchor rods, when the arrangement distance of the anchor rods is enlarged, the span of the steel enclosing purlin between the adjacent anchor rods is increased, the span supporting rigidity of the steel enclosing purlin is reduced, and the deformation capability of a foundation pit is reduced; the conventional methods of increasing the section size of the steel enclosing purlin or the grade of steel and the like can improve the bending rigidity of the section to a certain extent, but are limited by economy, steel material performance and construction feasibility, the transmission rate of the tension of the anchor rod to the span of the steel enclosing purlin cannot be improved efficiently, and the improvement of the overall supporting rigidity of the tension anchor supporting structure is limited.
Disclosure of Invention
The invention aims to solve the problems, and provides a fish-bellied beam anchor pulling supporting structure and a fish-bellied beam anchor pulling supporting structure construction method which are convenient to stretch, large in anchor rod spacing and strong in supporting capacity.
The invention solves the problems and adopts the technical scheme that:
a fish-belly sill anchor-pulling supporting structure comprises a foundation pit, anchor rods, a steel enclosing purlin and an enclosing protective plate, wherein the enclosing protective plate is arranged on the inner side wall of the foundation pit, the anchor rods are inserted on the enclosing protective plate at intervals and extend into the inner side wall of the foundation pit, the anchor rods are inclined relative to a horizontal plane, the steel enclosing purlin is horizontally arranged on the enclosing protective plate, one inclined upward end of each anchor rod is connected with the steel enclosing purlin, anchor device assemblies which correspond to the anchor rods in a one-to-one mode are arranged on the steel enclosing purlin at intervals and comprise anchor seats, front end plates and anchor device anchors, each anchor seat is composed of two same and parallel special-shaped steel plates, the inclination angles of the anchor seats are all adapted to the anchor rods, the anchor seats are all arranged on the steel enclosing purlin, the front end plates are all arranged on the anchor seats, round holes which are adapted to the anchor devices are all arranged on the front end plates, the anchor devices are all arranged in the round holes of the front anchor devices, the anchor devices are all connected with the anchor rods, and the front end plates are all provided with tensioning cushion plates, the two sides of the tensioning backing plate are provided with steel strand anchors, anchor holes are formed in the steel strand anchors at intervals, steel strands are arranged between each group of steel strand anchors and adjacent steel strand anchors, the steel strands are connected in the anchor holes of the steel strand anchors, supporting rods connected with the steel enclosing purlins are arranged between every two adjacent anchor assemblies at intervals, and the end portions of the supporting rods are attached to the steel strands.
A construction method of a fish-belly sill anchor pulling supporting structure comprises the following steps,
the method comprises the following steps: anchor rods are arranged on the inner side wall of the foundation pit at intervals towards the stratum of the foundation pit, and the arrangement angle is inclined downwards;
step two: installing a through long steel plate, erecting a steel enclosing purlin, and welding batten plates and batten strips on the steel enclosing purlin at intervals to enable anchor rods to sequentially penetrate through circular holes of the through long steel plate, the steel enclosing purlin and the batten plates;
step three: welding anchor assemblies on batten plates with anchor rods, welding stay bars on batten plates between the anchor assemblies, welding tensioning base plates on the anchor assemblies, and installing steel strand anchors on two sides of the tensioning base plates;
step four: cutting steel strands with proper length and quantity at the outer empty site of the foundation pit, connecting the steel strands with a steel strand anchorage device, enabling the steel strands to be attached to the end parts of the supporting rods, and preliminarily locking an anchor rod anchorage device of the anchorage device assembly;
step five: and tensioning the anchor rods to a specified tension at intervals in sequence, and locking the anchor rods.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
the steel enclosing purlin between the anchor rods is directly acted by the tensile force of the anchor rods through the steel strands and the support rods, the transmission ratio of the tensile force of the anchor rods to the span of the steel enclosing purlin is improved, and the problem of weak supporting force between the anchors in the existing anchor pulling supporting technology is solved.
Secondly, after the steel enclosing purlin between the anchor rods is subjected to the pre-pressure of the support rod, an active supporting effect can be exerted on the enclosing protective plate, the inter-anchor supporting rigidity of the anchor pulling supporting structure is improved, and the deformation control capability of the foundation pit is enhanced.
And thirdly, the anchor rod and the steel strand are linked to work, the tension anchor rod can simultaneously complete the application of prestress of the steel strand, and the construction is convenient.
The device can improve the ultimate uplift bearing capacity of the anchor rod, and expand the arrangement distance of the anchor rod of the anchor pulling supporting structure on the basis of ensuring the integral supporting rigidity, so as to avoid the stratum which is easy to collapse and deform.
Preferably, the further technical scheme of the invention is as follows:
the steel enclosing purlin is provided with batten plates and batten strips at intervals, the batten plates and the batten strips are arranged alternately, the anchorage device assemblies and the stay bars are arranged on the batten plates, and the batten plates connected with the anchorage device assemblies are provided with round holes adaptive to anchor devices of anchor rods; the reinforced steel purlin is convenient for mounting the anchor assembly and the support rod.
A through long steel plate is arranged between the steel purlin and the enclosure plate, and a round hole matched with the anchor rod is arranged on the through long steel plate; the reinforced steel enclosing purlin is convenient for the steel enclosing purlin to be connected with the enclosing protective plate.
Ribbed plates are arranged on both sides of the anchor base and are connected with the batten plates; and the connection strength of the anchor seat and the steel purlin is enhanced.
The tensioning backing plate is an I-shaped plate, the flanges at two sides of the tensioning backing plate are respectively provided with a circular rod which is symmetrically arranged, the steel strand anchors are respectively provided with hooks which are symmetrically arranged and are adaptive to the circular rods, and the steel strand anchors are connected with the circular rods through the hooks; the angle of the steel strand can be flexibly rotated.
The end parts of the stay bars are provided with curved plates which are attached to the steel strands; the steel strand is more convenient to attach and move, and the steel strand is prevented from being damaged.
Welding round rods at flanges at two ends of the tensioning backing plate, welding symmetrically-arranged hooks on the steel strand anchorage device, and hanging the hooks on the round rods; the angle of the steel strand can be flexibly rotated.
Welding a curved plate at the end part of the stay bar to ensure that the curved plate is attached to the steel strand; the steel strand is more convenient to attach and move, and the steel strand is prevented from being damaged.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a view taken at A-A in FIG. 1;
FIG. 3 is a schematic view of the structure of the batten plate and batten strip of the embodiment of the invention engaged on a steel purlin;
FIG. 4 is a schematic side view of a steel purlin according to an embodiment of the present invention;
FIG. 5 is a schematic view of the configuration of the anchor assembly and tensioning pad assembly of an embodiment of the present invention in cooperation;
FIG. 6 is a schematic view of the engagement of an anchor block with a front end plate according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the construction of a tension pad according to an embodiment of the present invention;
FIG. 8 is a schematic structural view of a steel strand anchor according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of a brace bar according to an embodiment of the invention;
FIG. 10 is a schematic side view of a brace bar according to an embodiment of the invention;
fig. 11 is a schematic structural view of the matching of the stay bar and the steel purlin of the embodiment of the invention.
In the figure: an anchor rod 1; a steel purlin 2; a batten strip 3; a gusset plate 4; a stay bar 5; a steel strand 6; a containment plate 7; a long steel plate 8; an anchor block 9-1; a front end plate 9-2; rib plate 9-3; an anchor rod anchorage device 9-4; a steel strand anchorage 10-1; tensioning a base plate 10-2; 10-3 of a round rod; 10-4 of a hook; a middle plate 11-1; a curved steel plate 11-2; a limiting plate 11-3;
the specific implementation mode is as follows:
the invention will be further illustrated by the following examples, which are intended only for a better understanding of the present invention and therefore do not limit the scope of the invention.
Referring to fig. 1 to 11, a fish belly sill anchor pulling supporting structure, including the foundation ditch, stock 1, the steel encloses purlin 2 and apron plate 7, the laminating of apron plate 7 is on the inside wall of foundation ditch, stock 1 interval is inserted on apron plate 7 and is stretched into the foundation ditch inside wall, and the anchor is in the outer stable stratum of foundation ditch, the relative horizontal plane slope of stock 1, the steel encloses purlin 2 level and pastes and lean on apron plate 7, the steel encloses and has welded logical long steel sheet 8 between purlin 2 and the apron plate 7, it has the round hole that suits with stock 1 to bore on the logical long steel sheet 8, it encloses purlin 2 to consolidate the steel, make things convenient for the steel to enclose purlin 2 and enclose being connected of apron plate 7, the ascending one end of stock 1 slope is connected with steel apron plate 2.
The front end plate 9-2 is provided with a tensioning backing plate 10-2, two sides of the tensioning backing plate 10-2 are provided with a steel strand anchorage device 10-1, the tensioning backing plate 10-2 is an I-shaped steel plate, two side flanges of the tensioning backing plate 10-2 are embedded with symmetrical round rods 10-3, the steel strand anchorage device 10-1 is in a long strip shape structure, symmetrical hooks 10-4 which are matched with the round rods 10-3 are welded on the steel strand anchorage device 10-1, anchor holes are drilled on the steel strand anchorage device 10-1 at intervals, steel strands 6 can penetrate into the holes for anchoring, the steel strands 6 are anchored between each group of steel strand anchorage device 10-1 and the adjacent steel strand anchorage device 10-1, the steel strands 6 are connected in the anchor holes of the steel strand anchorage device 10-1, the steel strand anchorage device 10-1 is connected with the round rods 10-3 through the hooks 10-4, the angle of the steel strand 6 can be flexibly rotated.
A supporting unit is arranged between every two adjacent anchor assemblies, supporting rods 5 connected with batten plates 4 are welded between every two adjacent anchor assemblies at intervals, the supporting rods 5 are formed by cutting and welding I-shaped steel, the supporting rods 5 are perpendicular to steel surrounding purlins 2, the length of each supporting rod 5 in each supporting unit is middle height, the height of each supporting rod is gradually reduced towards two sides, middle plates 11-1 are welded to the end portions of the supporting rods 5, curved steel plates 11-2 are welded to the middle plates 11-1, limiting plates 11-3 are welded to two ends of each curved steel plate 11-2, and the curved steel plates 11-2 are all attached to steel strands 6, so that the steel strands 6 are attached and moved more conveniently, and damage to the steel strands 6 is avoided.
The tensioning backing plate 10-2 is parallel to the front end plate 9-2 after the steel strand 6 is in place and straightened, and is separated from the front end plate 9-2 by a gap, the size of the gap is determined according to the size of prestress required to be applied to the steel strand 6, when the anchor rod 1 is tensioned, the tensioning backing plate 10-2 is pressed to the variable-angle anchor seat 9-1 by the anchor rod anchorage device 9-4, and finally attached to the front end plate 9-2.
A construction method of a fish-belly sill anchor pulling supporting structure comprises the following steps,
the method comprises the following steps: arranging anchor rods 1 on the inner side wall of the foundation pit at intervals towards the stratum of the foundation pit, wherein the arranging angle is inclined downwards;
step two: installing a through long steel plate 8, erecting a steel surrounding purlin 2, and pasting and welding batten plates 4 and batten strips 3 on the steel surrounding purlin 2 at intervals, so that the anchor rods 1 sequentially penetrate out of round holes of the through long steel plate 8, the steel surrounding purlin 2 and the batten plates 4;
step three: welding anchor components on gusset plates 4 with anchor rods 1, welding stay bars 5 on the gusset plates 4 between the anchor components, and welding tensioning backing plates 10-2 on the anchor components;
step four: welding round rods 10-3 at flanges at two ends of a tensioning backing plate 10-2, welding symmetrically-arranged hooks 10-4 on a steel strand anchorage device 10-1, and hanging the hooks 10-4 on the round rods 10-3;
step five: welding a curved steel plate 11-2 at the end part of the stay bar 5;
step four: cutting steel strands 6 with proper length and quantity at the empty site outside the foundation pit, connecting the steel strands 6 with a steel strand anchorage device 10-1, enabling the steel strands 6 to be attached to a curved steel plate 11-2, and primarily locking an anchor rod anchorage device 9-4 of an anchorage device assembly;
step five: and tensioning the anchor rods 1 to a specified tension at intervals in sequence, and locking the anchor rods 1.
According to the invention, the tensile force of the anchor rod 1 directly acts on the steel surrounding purlin 2 between the anchor rods 1 through the steel strand 6 and the support rod 5, the transfer ratio of the tensile force of the anchor rod 1 to the span of the steel surrounding purlin 2 is improved, the problem of weak supporting force between anchors in the existing anchor pulling supporting technology is solved, after the steel surrounding purlin 2 between the anchor rods 1 is subjected to the pre-pressure of the support rod 5, the active supporting action can be exerted on the surrounding protective plate 7, the rigidity of the anchor pulling supporting structure between the anchors is improved, the deformation control capability of a foundation pit is enhanced, the anchor rod 1 and the steel strand 6 work in a linkage manner, the application of the prestress of the steel strand 6 can be completed simultaneously when the anchor rod 1 is pulled, the construction is convenient and fast, the ultimate pulling bearing capacity of the anchor rod 1 can be improved, the arrangement distance of the anchor rod 1 of the anchor pulling supporting structure is enlarged on the basis of ensuring the rigidity of the integral supporting, and the stratum which is easy to collapse and deformation is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (9)
1. The utility model provides a fish belly sill anchor pulling supporting structure, encloses the purlin and encloses the backplate including foundation ditch, stock, steel, encloses the backplate setting on the inside wall of foundation ditch, and the stock interval is inserted on enclosing the backplate and is stretched into the foundation ditch inside wall, and the relative horizontal plane slope of stock, steel enclose the purlin level setting on enclosing the backplate, and the ascending one end of stock slope encloses the purlin with the steel and is connected its characterized in that: the steel enclosing purlin is provided with anchor assembly components which are in one-to-one correspondence with the positions of the anchor rods at intervals, each anchor assembly component comprises an anchor seat, a front end plate and an anchor rod anchor, each anchor seat is composed of two same special-shaped steel plates which are parallel to each other, the inclination angles of the anchor seats are all adapted to the corresponding anchor rods, the anchor seats are all arranged on the steel enclosing purlins, the front end plates are all arranged on the anchor seats, the front end plates are all provided with round holes which are adapted to the anchor rods, the anchor rod anchors are all arranged in the round holes of the front end plates, the anchor rod anchors are all connected with the anchor rods, the front end plates are all provided with tensioning cushion plates, both sides of the tensioning cushion plates are all provided with steel strand anchors, the steel strand anchors are all provided with anchor holes at intervals, steel strands are all arranged between each group of steel strand anchors and adjacent steel strand anchors, the steel strands are connected in the anchor holes of the steel strand anchors, and strut rods connected with the steel enclosing purlins are arranged between every two adjacent anchor assembly components at intervals, the end part of the stay bar is jointed with the steel strand.
2. The fish-belly sill anchor pulling and supporting structure according to claim 1, wherein: the steel encloses the purlin and goes up the interval and be provided with lacing plate and lacing bar, and lacing plate and lacing bar are arranged alternately, and ground tackle subassembly and vaulting pole all set up on the lacing plate, all are provided with the round hole that suits with the stock ground tackle on the lacing plate of being connected with ground tackle subassembly.
3. The fish-belly sill anchor pulling and supporting structure according to claim 1, wherein: a through long steel plate is arranged between the steel enclosing purlin and the enclosing protective plate, and a round hole matched with the anchor rod is formed in the through long steel plate.
4. The fish-belly sill anchor pulling and supporting structure according to claim 2, characterized in that: both sides of the anchor block are provided with ribbed plates which are connected with the batten plates.
5. The fish-belly sill anchor pulling and supporting structure according to claim 1, wherein: the tensioning base plate is an I-shaped plate, circular rods which are symmetrically arranged are arranged on flanges on two sides of the tensioning base plate, hooks which are symmetrically arranged and are matched with the circular rods are arranged on the steel strand anchorage device, and the steel strand anchorage device is connected with the circular rods through the hooks.
6. The fish-belly sill anchor pulling and supporting structure according to claim 1, wherein: the tip of vaulting pole all is provided with the curved plate, and the curved plate all laminates with steel strand wires.
7. A construction method of a fish-belly sill anchor pulling supporting structure is characterized by comprising the following steps:
the method comprises the following steps: anchor rods are arranged on the inner side wall of the foundation pit at intervals towards the stratum of the foundation pit, and the arrangement angle is inclined downwards;
step two: installing a through long steel plate, erecting a steel enclosing purlin, and welding batten plates and batten strips on the steel enclosing purlin at intervals to enable anchor rods to sequentially penetrate through circular holes of the through long steel plate, the steel enclosing purlin and the batten plates;
step three: welding anchor assemblies on batten plates with anchor rods, welding stay bars on batten plates between the anchor assemblies, welding tensioning base plates on the anchor assemblies, and installing steel strand anchors on two sides of the tensioning base plates;
step four: cutting steel strands with proper length and quantity at the outer empty site of the foundation pit, connecting the steel strands with a steel strand anchorage device, enabling the steel strands to be attached to the end parts of the supporting rods, and preliminarily locking an anchor rod anchorage device of the anchorage device assembly;
step five: and tensioning the anchor rods to a specified tension at intervals in sequence, and locking the anchor rods.
8. The fish-belly sill anchor pulling and supporting structure construction method according to claim 7, characterized in that: round rods are welded at flanges at two ends of the tensioning base plate, hooks which are symmetrically arranged are welded on the steel strand anchorage device, and the hooks are hung on the round rods.
9. The fish-belly sill anchor pulling and supporting structure construction method according to claim 7, characterized in that: and welding a curved plate at the end part of the stay bar to ensure that the curved plate is attached to the steel strand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111259496.0A CN113863322A (en) | 2021-10-28 | 2021-10-28 | Fish-belly sill anchor pulling supporting structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111259496.0A CN113863322A (en) | 2021-10-28 | 2021-10-28 | Fish-belly sill anchor pulling supporting structure and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113863322A true CN113863322A (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111259496.0A Withdrawn CN113863322A (en) | 2021-10-28 | 2021-10-28 | Fish-belly sill anchor pulling supporting structure and construction method thereof |
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| Country | Link |
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| CN (1) | CN113863322A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204343302U (en) * | 2014-12-26 | 2015-05-20 | 王群霖 | A kind of building foundation pit prestressed anchor fixing structure |
| CN105569052A (en) * | 2016-01-08 | 2016-05-11 | 上海强劲地基工程股份有限公司 | Locking device and construction method for prestressing force of assembled fish belly sill |
| CN105604068A (en) * | 2016-01-15 | 2016-05-25 | 北京工业大学 | Zigzag prestress enclosure purlin for foundation pit engineering and construction method thereof |
| CN214005669U (en) * | 2020-06-05 | 2021-08-20 | 中航勘察设计研究院有限公司 | Wall anchor bolt supporting structure |
| CN113356198A (en) * | 2021-07-01 | 2021-09-07 | 青岛业高建设工程有限公司市北分公司 | Single-spliced channel steel anchor rod waist beam structure and using method thereof |
-
2021
- 2021-10-28 CN CN202111259496.0A patent/CN113863322A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204343302U (en) * | 2014-12-26 | 2015-05-20 | 王群霖 | A kind of building foundation pit prestressed anchor fixing structure |
| CN105569052A (en) * | 2016-01-08 | 2016-05-11 | 上海强劲地基工程股份有限公司 | Locking device and construction method for prestressing force of assembled fish belly sill |
| CN105604068A (en) * | 2016-01-15 | 2016-05-25 | 北京工业大学 | Zigzag prestress enclosure purlin for foundation pit engineering and construction method thereof |
| CN214005669U (en) * | 2020-06-05 | 2021-08-20 | 中航勘察设计研究院有限公司 | Wall anchor bolt supporting structure |
| CN113356198A (en) * | 2021-07-01 | 2021-09-07 | 青岛业高建设工程有限公司市北分公司 | Single-spliced channel steel anchor rod waist beam structure and using method thereof |
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Application publication date: 20211231 |
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