CN111236620A - Anchor bolt sleeve and construction method for recoverable cantilever scaffold anchor bolt - Google Patents
Anchor bolt sleeve and construction method for recoverable cantilever scaffold anchor bolt Download PDFInfo
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- CN111236620A CN111236620A CN202010048275.8A CN202010048275A CN111236620A CN 111236620 A CN111236620 A CN 111236620A CN 202010048275 A CN202010048275 A CN 202010048275A CN 111236620 A CN111236620 A CN 111236620A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/04—Means for fastening, supporting, or bracing scaffolds on or against building constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/18—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by cantilevers or other provisions mounted in openings in the building, e.g. window openings
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Abstract
The invention relates to an anchor bolt sleeve and a construction method of an anchor bolt of a recyclable cantilever scaffold, belonging to the technical field of steel cantilever scaffold construction. During construction, inserting the U-shaped anchor bolt into the branch pipe from the insertion hole of the base, penetrating the U-shaped anchor bolt out of the branch pipe, fixing the anchor bolt sleeve on a floor slab template, and placing the overhanging type steel beam after the anchor bolt is poured and formed along with concrete without directly contacting with the concrete; after the overhanging outer scaffold is dismantled, the anchor bolt is dismantled from the embedded anchor bolt sleeve for recovery and maintenance, the anchor bolt is convenient to recycle, the cost is reduced, and the material and the environment are saved.
Description
Technical Field
The invention relates to the technical field of steel cantilever scaffold construction, in particular to an anchor bolt sleeve and a construction method of a recyclable cantilever scaffold anchor bolt.
Background
With the rapid development of the building industry, building structures are pushed to be higher and more complex, high-rise and special-shaped building structures are increasing day by day, cantilever scaffolds are often necessary conditions for ensuring smooth construction of the scaffold, and the scaffold has the advantages of flexible layout, good safety performance, no mutual interference with other procedures and the like, and is widely applied. The research on the cantilever steel frame anchoring bolt assembly is just embodied in the way of tool development. This subassembly is applied to the end of outrigger girder steel, plays the fixed girder steel of anchor, resists the effect of the moment of flexure effect that is transmitted by outrigger load.
At present, the cantilever steel anchoring of the steel cantilever external scaffold of the high-rise building usually adopts a U-shaped steel pull ring or an anchoring bolt to fix the steel on a floor slab. The traditional method is that a U-shaped steel bar pull ring or an anchoring bolt is directly embedded on a concrete floor slab or a beam and is directly contacted with concrete; the cantilever outer frame is cut after being dismantled, and the cantilever outer frame cannot be used in a turnover mode, so that the material and labor waste condition exists, and the cantilever outer frame is uneconomical, not material-saving and environment-friendly.
Disclosure of Invention
One of the purposes of the invention is to provide an anchor bolt sleeve which has the advantages of being convenient for turnover and recovery of anchor bolts, reducing cost, saving materials and protecting environment.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides an anchor bolt sleeve pipe, includes base and two branch pipes that are parallel to each other fixed set up on the base, base and two branch pipes constitute the U-shaped structure, the jack that runs through to the branch pipe is seted up to the diapire of base.
When the technical scheme is implemented, the U-shaped anchoring bolts are inserted into the branch pipes from the insertion holes of the base and penetrate out of the branch pipes, the anchoring bolt sleeves are fixed on the floor slab formwork, the anchoring bolts are not in direct contact with concrete, and the overhanging type steel beams are placed after the anchoring bolts are poured and formed along with the concrete; after the overhanging outer scaffold is dismantled, the anchor bolt is dismantled from the embedded anchor bolt sleeve for recovery and maintenance, the anchor bolt is convenient to recycle, the cost is reduced, and the material and the environment are saved.
The invention is further configured to: the base is provided with fixed feet, the fixed feet are provided with fixed holes penetrating through the fixed feet, and the number of the fixed feet is at least two.
According to the technical scheme, the iron nails penetrate through the fixing holes and are nailed into the template, the purpose of fixing the anchor bolt sleeve is achieved, and the anchor bolt sleeve is guaranteed to be kept in a vertical state.
The invention is further configured to: the bottom walls of the fixed feet and the base are both planes, and the containing groove is formed in the bottom wall of the base along the length direction of the base.
Implement above-mentioned technical scheme, anchor bolt's bottom horizontal segment is located the storage tank, and the diapire of fixed foot and base is established to the plane to make base and template surface laminating, make anchor bolt sleeve pipe fixed stable, when preventing to pour concrete simultaneously, in the concrete infiltration base.
The invention is further configured to: the cross section of the branch pipe is elliptical.
Implement above-mentioned technical scheme, insert anchor bolt after, if when having installation error, be convenient for adjust anchor bolt position, increase the suitability.
The invention also aims to provide a construction method for the recoverable cantilever scaffold anchor bolt, which has the advantages of convenient turnover and recovery of the anchor bolt, cost reduction, material saving and environmental protection.
A construction method for recoverable cantilever scaffold anchoring bolts comprises the following steps:
s1, calculating the scheme and safety of the section steel cantilever scaffold;
s2, preparing construction materials;
s3, paving a template, and paving a cantilever layer beam slab template after the cantilever layer inner frame is completely erected;
s4, positioning and paying off, namely positioning and paying off each overhanging I-beam according to the overhanging I-beam layout, and marking the position of each anchoring bolt;
s5, placing an anchor bolt sleeve and an anchor bolt, positioning and paying off, sleeving the anchor bolt by using the pre-embedded finished anchor bolt sleeve, and placing the anchor bolt at the positioned position;
s6, correcting and fixing the plastic sleeve, correcting the position of the sleeve, checking and accepting the process, and fixing the anchoring bolt sleeve on the floor slab template by using iron nails;
s7, placing concrete and the section steel cantilever beam, after steel bar binding and water and electricity reservation and pre-embedding are completed, placing the cantilever I-shaped steel after the concrete is poured and formed in a concealed and accepted qualified mode;
s8, fixing the anchor bolt;
s9, dismantling and recovering the anchor bolts, dismantling the outer scaffold system after the construction of the relevant working procedures of the outer wall is finished, and dismantling the anchor bolts from the embedded anchor bolt sleeves after the section steel cantilever beam is dismantled;
and S10, plugging the embedded sleeve, and plugging the anchor bolt sleeve hole after the anchor bolt is removed by using fine aggregate concrete.
When the technical scheme is implemented, the anchoring bolt sleeve is fixed on the floor slab template by the iron nails during construction; thereby ensuring that the anchor bolt is kept in a vertical state; after the construction of the relevant working procedures of the outer wall is finished, the outer scaffold system is dismantled, and after the section steel cantilever beam is dismantled, the anchor bolt is dismantled from the pre-buried anchor bolt sleeve; and finally, plugging the anchoring bolt sleeve hole after the anchoring bolt is removed by using fine aggregate concrete. The method has the characteristics of single purchase and lifelong turnover use, has low manufacturing cost, and has the advantages of simplicity, convenience, economy, material saving, environmental protection, recycling, turnover utilization and the like.
The invention is further configured to: in S3, after the cantilever layer beam template is laid, the template flatness, elevation, section size and the like are checked and accepted by a guiding rule, a clearance gauge and the like, the allowable error of the elevation of the template is controlled within +/-5 mm, and the error of the flatness of the template is controlled within 0-5 mm.
Implement above-mentioned technical scheme, carry out the process through guiding rule, clearance gauge etc. to template roughness, elevation, cross-sectional dimension etc. and accept to guarantee the roughness on plank surface, improve construction quality.
The invention is further configured to: in S8, after the overhanging I-steel is placed, the anchoring bolts are fixed strictly according to the scheme and the specification requirements, and each overhanging I-steel is fixed by three anchoring bolts.
Implement above-mentioned technical scheme, adopt three anchor bolts to fix the I-steel of encorbelmenting to improve the fixed effect to the I-steel of encorbelmenting.
The invention is further configured to: the three anchor bolts are all fixed with I-shaped steel by double nuts and gaskets, and the clearance between the I-shaped steel and the anchor bolts is wedged tightly by hard wood wedges; and after reinforcement, erecting the overhanging scaffold according to the scheme design.
According to the technical scheme, the gap between the I-steel and the anchor bolt is wedged tightly through the hard wood wedge, so that the installation stability of the I-steel is guaranteed.
In summary, compared with the prior art, the beneficial effects of the invention are as follows:
firstly, fixing an anchoring bolt sleeve on a floor slab template, wherein an anchoring bolt is not in direct contact with concrete, and placing an overhanging type steel beam after pouring and forming along with the concrete; after the overhanging outer scaffold is dismantled, the anchor bolts are dismantled from the embedded anchor bolt sleeves for recovery, maintenance and repair, the anchor bolts are convenient to circulate and recover, the cost is reduced, and the materials and the environment are saved;
the horizontal section of the bottom of the anchor bolt is positioned in the accommodating groove, and the fixing feet and the bottom wall of the base are designed to be planes so that the base is attached to the surface of the wood board, the anchor bolt sleeve is stably fixed, and meanwhile, when concrete is poured, the concrete is prevented from permeating into the base;
thirdly, the product is purchased once, recycled for life, and has low cost; saving material and environmental protection.
Drawings
FIG. 1 is a schematic structural view of an anchor bolt bushing of the present invention;
FIG. 2 is a schematic structural view of the anchor bolt bushing of the present invention from another perspective;
fig. 3 is a schematic structural diagram of the invention after installation of the i-beam.
Reference numerals: 1. a base; 11. a jack; 12. a containing groove; 2. a branch pipe; 3. a fixing leg; 31. a fixing hole; 4. an anchor bolt; 41. a nut; 5. i-shaped steel; 6. a gasket; 7. a hard wood wedge; 8. and (5) wood cushion.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1 and 2, an anchor bolt bushing includes a base 1 and two branch pipes 2 parallel to each other and fixedly disposed on the base 1. The base 1 and the two branch pipes 2 form a U-shaped structure matched with the anchor bolt 4, and the base 1 and the branch pipes 2 are integrally formed by PVC; in this embodiment, the sleeve of the anchor bolt is 2mm thick and is in a U-shaped filament shape.
As shown in fig. 2, the bottom wall of the base 1 is provided with an insertion hole 11 penetrating to the branch pipe 2, and the bottom wall of the base 1 is a surface of the base 1 away from the branch pipe 2, that is, a surface contacting with a formwork during construction.
As shown in fig. 2, the base 1 is provided with at least two fixing legs 3, the fixing legs 3 are provided with at least two fixing holes 31 penetrating through the fixing legs 3. In this embodiment, fixed foot 3 sets up four, and the equipartition is at the both ends of base 1, is the rectangle and distributes. When the anchor bolt is fixed, the iron nails penetrate through the fixing holes 31 and are driven into the template, namely, the purpose of fixing the anchor bolt 4 sleeve is achieved, and the anchor bolt 4 sleeve is ensured to be kept in a vertical state.
As shown in fig. 2, in order to ensure stable installation, the bottom walls of the fixing legs 3 and the base 1 are both flat surfaces, the bottom wall of the base 1 is provided with an accommodating groove 12 along the length direction of the base 1, and the depth of the accommodating groove 12 is not less than the diameter of the anchor bolt 4; during the installation, base 1 and template surface laminating for 4 sleeve pipe of anchor bolt are fixed stable, when preventing to pour the concrete simultaneously, in the concrete infiltration base 1.
In addition, as shown in fig. 1 and 2, in the present embodiment, the cross section of the branch pipe 2 is an ellipse; in other embodiments, the manifold 2 may also be rectangular or kidney-shaped. After inserting anchor bolt 4, if there is the installation error time, be convenient for adjust anchor bolt 4 position, increase the suitability.
The height of the sleeve of the anchor bolt 4, i.e. the distance between the top wall of the branch pipe 2 and the bottom wall of the base 1, is 2cm higher than the designed floor thickness, for example, 120mm, and then the height of the sleeve of the anchor bolt 4 is 140 mm. And the long axis of the branch pipe 2 is 3cm long and the short axis is 2cm long. In this embodiment, the anchor bolt 4 is formed by cold-bending round steel of 18mm, and is U-shaped, 29cm high, 15cm wide, and 11cm long.
When in use: inserting a U-shaped anchor bolt 4 into the branch pipe 2 from the jack 11 of the base 1 and penetrating out of the branch pipe 2, fixing an anchor bolt sleeve on a floor slab template through an iron nail, wherein the anchor bolt 4 is not in direct contact with concrete, and placing an overhanging type steel beam after pouring and forming along with the concrete; after the overhanging outer scaffold is dismantled, the anchor bolt 4 is dismantled from the embedded anchor bolt sleeve for recovery and maintenance, the anchor bolt 4 is convenient to recycle, the cost is reduced, and the material and the environment are saved.
Example two.
As shown in fig. 3, a construction method of recoverable overhanging scaffold anchor bolts includes the following steps:
s1, calculating the scheme and safety of the section steel cantilever scaffold; before the process is started, the scheme design and safety calculation of the section steel cantilever scaffold are carried out according to design files issued by construction units and relevant standards and specifications, the scheme design and safety calculation are carried out after the approval, and the technical cross-over and the arrangement drawing of the cantilever I-steel 5 are carried out.
S2, preparing construction materials; design floor is thick most 120mm, and a small number of thick 100mm, and through the calculation of scheme, 16# I-steel 5 is selected for use to the cantilever beam, and 18 mm's round steel processing preparation is selected for use to anchor bolt 4, except that traditional shaped steel scaffold project required material of encorbelmenting, still need purchase finished product anchor bolt sleeve pipe, iron nail.
The finished product of the anchor bolt 4 sleeve adopted by the embodiment is made of PVC material, is 2mm thick, is in a U-shaped filiform shape and is provided with 4 fixing feet 3; the bottom is empty and the anchor bolt 4 can be directly nested in the bottom. The height of the sleeve is 14cm, and the pipe orifice is ensured to be 2cm higher than a concrete pouring surface; the width of the bottom is 17cm, the clear distance between the two pipe walls is 10cm, the pipe walls are elliptical, the major axis is 3cm wide, the minor axis is 2cm wide, and the anchor bolts 4 and the 16# I-steel 5 which are 18mm in length can be normally placed. The iron nail is a common iron nail for fixing the template.
S3, paving a template, and paving a cantilever layer beam slab template after the cantilever layer inner frame is completely erected; after the cantilever layer beam template is laid, the template flatness, the elevation, the section size and the like are subjected to process acceptance by using a guiding ruler, a clearance gauge and the like, the allowable error of the panel elevation is controlled within +/-5 mm, and the error of the panel flatness is controlled within 0-5 mm.
S4, positioning and paying off, namely positioning and paying off each overhanging I-beam 5 according to the layout drawing of the overhanging I-beam 5, and marking the position of each anchoring bolt 4; in addition, the wading room adopts the traditional method.
And S5, placing the anchor bolt 4 sleeve and the anchor bolt 4, positioning and paying off, sleeving the anchor bolt 4 by the pre-embedded finished anchor bolt 4 sleeve, and placing the anchor bolt 4 at the positioned position.
And S6, correcting and fixing the plastic sleeve, correcting the position of the sleeve, checking and accepting the process, and fixing the sleeve of the anchor bolt 4 on the floor slab template by using an iron nail.
S7, placing concrete and the section steel cantilever beam, after steel bar binding and water and electricity reservation and pre-embedding are completed, placing and adjusting the cantilever I-shaped steel 5 after the concrete is placed and qualified through concealment and acceptance.
S8, fixing the anchor bolt 4; after the I-steel 5 that encorbelments is laid, fix anchor bolt 4 according to scheme and standard requirement strictly, every I-steel 5 that encorbelments adopts three anchor bolts 4 to fix. The three anchor bolts 4 are all fixed with I-shaped steel 5 by double nuts 41 and gaskets 6, and skids 8 are arranged between the gaskets 6 and the I-shaped steel 5; and a hard wood wedge 7 is used for wedging a gap between the I-steel 5 and the anchor bolt 4; and after reinforcement, erecting the overhanging scaffold according to the scheme design.
S9, dismantling and recovering the anchor bolt 4, dismantling the outer scaffold system after the construction of the relevant working procedures of the outer wall is completed, and dismantling the anchor bolt 4 from the embedded anchor bolt 4 sleeve after the section steel cantilever beam is dismantled. When the operation is dismantled, arrange the special messenger and carry out other station at next floor, prevent that anchor bolt 4 that drops from hindering the people, retrieve and the rust cleaning maintenance, the turnover of reserving is used.
S10, plugging the embedded sleeve, plugging the sleeve hole of the anchor bolt 4 with the anchor bolt 4 removed by fine aggregate concrete, and trowelling the seal.
The invention has at least the following advantages:
1. the product has the advantages of single purchase and lifelong recovery and turnover use; after the anchor bolt 4 is purchased and used once, the detachable back can be recovered and used in a turnover way, the next construction project can be used, the whole purchase is not needed, the repeated utilization rate is high, and the conversion from one-time input auxiliary material to one-time input turnover material of the cantilever type steel anchor bolt 4 is realized.
2. The manufacturing cost is low; compared with the traditional method for directly cutting the anchor bolt 4 after dismantling the cantilever steel of the cantilever external scaffold, the method has the advantages that the anchor bolt 4 is not in direct contact with concrete, after single purchase, the anchor bolt 4 can be recycled and reused for the next construction project, and the amortization cost of a single project is low.
The unit price of the anchor bolt 4 is generally 17 yuan/piece; in the invention, the number of the anchor bolt 4 sleeves is 0.6 yuan/one; because the number of the overhanging I-beams 5 used in each project is large, each overhanging I-beam 5 needs to be fixed by three anchor bolts 4, and the cost is greatly saved by recovering the anchor bolts 4.
3. The material is saved, and the environment is protected; after the overhanging outer scaffold is dismantled, the anchor bolts 4 on the floor except the wading room are not required to be cut and wasted, and can be recycled, so that the material loss rate is reduced, the material is saved, and the resource consumption is reduced. Meanwhile, by adopting the method, the light pollution of the embedded anchor bolt 4, the disassembled electric welding light pollution and the cutting site noise pollution in the traditional manufacturing method can be effectively reduced, and the method is green and environment-friendly.
4. Construction can be carried out in a penetrating and inserting mode, and the construction period is shortened; the sleeve can be embedded after the floor slab template is laid, the anchoring bolts 4 are not embedded after the floor slab bottom ribs are laid, the working procedures are connected compactly, and the occupied construction period is shortened. When the dismounting is carried out, the anchor bolt 4 can be dismounted and recovered only by tapping with a leather hammer without manual cutting, thereby greatly saving labor.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. An anchor bolt bushing characterized by: the automatic pipe bending machine comprises a base (1) and two branch pipes (2) which are parallel to each other and fixedly arranged on the base (1), wherein the base (1) and the two branch pipes (2) form a U-shaped structure, and jacks (11) penetrating through the branch pipes (2) are formed in the bottom wall of the base (1).
2. An anchor bolt bushing according to claim 1, wherein: the base (1) is provided with fixing feet (3), fixing holes (31) penetrating through the fixing feet (3) are formed in the fixing feet (3), and the number of the fixing feet (3) is at least two.
3. An anchor bolt bushing according to claim 2, wherein: the bottom walls of the fixed feet (3) and the base (1) are both planes, and the bottom wall of the base (1) is provided with a containing groove (12) along the length direction of the base (1).
4. An anchor bolt bushing according to claim 3, wherein: the cross section of the branch pipe (2) is elliptical.
5. The construction method of the recoverable cantilever scaffold anchor bolt is characterized by comprising the following steps of: construction with the anchor bolt bushing of any one of claims 1-4, comprising the steps of:
s1, calculating the scheme and safety of the section steel cantilever scaffold;
s2, preparing construction materials;
s3, paving a template, and paving a cantilever layer beam slab template after the cantilever layer inner frame is completely erected;
s4, positioning and paying off, namely positioning and paying off each overhanging I-shaped steel (5) according to an overhanging I-shaped steel (5) layout drawing, and marking the position of each anchoring bolt (4);
s5, placing an anchor bolt sleeve and an anchor bolt (4), positioning and paying off, sleeving the anchor bolt (4) by using a pre-embedded finished anchor bolt sleeve, and placing the anchor bolt at the positioned position;
s6, correcting and fixing the plastic sleeve, correcting the position of the sleeve, checking and accepting the process, and fixing the anchoring bolt sleeve on the floor slab template by using iron nails;
s7, placing concrete and the section steel cantilever beam, after steel bar binding and water and electricity reservation and pre-embedding are completed, placing the cantilever I-shaped steel (5) after the concrete is formed and qualified by concealed acceptance and acceptance;
s8, fixing the anchor bolt (4);
s9, detaching and recovering the anchor bolts (4), detaching the outer scaffold system after the construction of the relevant working procedures of the outer wall is finished, and detaching the anchor bolts (4) from the sleeves of the pre-embedded anchor bolts (4) after the section steel cantilever beam is detached;
s10, plugging the embedded sleeve, and plugging the anchor bolt sleeve hole after the anchor bolt (4) is removed by using fine aggregate concrete.
6. The recoverable overhanging scaffold anchor bolt construction method of claim 5, wherein: in S3, after the cantilever layer beam template is laid, the template flatness, elevation, section size and the like are checked and accepted by a guiding rule, a clearance gauge and the like, the allowable error of the elevation of the template is controlled within +/-5 mm, and the error of the flatness of the template is controlled within 0-5 mm.
7. The recoverable overhanging scaffold anchor bolt construction method of claim 5, wherein: in S8, after the overhanging I-shaped steel (5) is placed, the anchoring bolts (4) are fixed strictly according to the scheme and the specification requirements, and each overhanging I-shaped steel (5) is fixed by three anchoring bolts (4).
8. The recoverable overhanging scaffold anchor bolt construction method of claim 7, wherein: three anchor bolts (4) are all fixed with I-shaped steel (5) by double nuts (41) and gaskets (6), and the clearance between the I-shaped steel (5) and the anchor bolts (4) is wedged tightly by hard wood wedges (7); and after reinforcement, erecting the overhanging scaffold according to the scheme design.
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| CN202010048275.8A CN111236620A (en) | 2020-01-16 | 2020-01-16 | Anchor bolt sleeve and construction method for recoverable cantilever scaffold anchor bolt |
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| CN202010048275.8A CN111236620A (en) | 2020-01-16 | 2020-01-16 | Anchor bolt sleeve and construction method for recoverable cantilever scaffold anchor bolt |
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| CN112459453A (en) * | 2020-11-24 | 2021-03-09 | 山西三建集团有限公司 | Clamping and fixing method for overhanging I-shaped steel |
| CN113152871A (en) * | 2021-04-18 | 2021-07-23 | 广西建工第一建筑工程集团有限公司 | Tool type temporary cantilever steel beam foundation system device and mounting and dismounting use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459453A (en) * | 2020-11-24 | 2021-03-09 | 山西三建集团有限公司 | Clamping and fixing method for overhanging I-shaped steel |
| CN113152871A (en) * | 2021-04-18 | 2021-07-23 | 广西建工第一建筑工程集团有限公司 | Tool type temporary cantilever steel beam foundation system device and mounting and dismounting use method |
| CN116446647A (en) * | 2023-06-15 | 2023-07-18 | 北京建工集团山西建设有限公司 | U-shaped ring through hole forming die and forming method for inner side end of overhanging I-shaped steel beam |
| CN116446647B (en) * | 2023-06-15 | 2023-08-18 | 北京建工集团山西建设有限公司 | U-shaped ring through hole forming die and forming method for inner side end of overhanging I-shaped steel beam |
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Application publication date: 20200605 |