CN208981531U - A kind of prefabricated assembled parapet connection structure - Google Patents
A kind of prefabricated assembled parapet connection structure Download PDFInfo
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- CN208981531U CN208981531U CN201821738074.5U CN201821738074U CN208981531U CN 208981531 U CN208981531 U CN 208981531U CN 201821738074 U CN201821738074 U CN 201821738074U CN 208981531 U CN208981531 U CN 208981531U
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Abstract
The utility model relates to a kind of prefabricated assembled parapet connection structures, it is characterised in that: including parapet and cast-in-site roof nose girder；The top surface of the cast-in-site roof nose girder is equipped with vertical reinforcement, parapet is located at the top of cast-in-site roof nose girder, there are gaps between parapet and cast-in-site roof nose girder, gap outermost is equipped with cement base joint seal seat, the bottom end of parapet is equipped with grout sleeve, grout sleeve includes upper reinforcement connecting hole, lower rebar connecting hole, be in the milk interface and pulp interface, upper reinforcement connecting hole is connect with reinforcing bar inside parapet, vertical reinforcement is inserted into lower rebar connecting hole, the diameter of vertical reinforcement is less than the aperture of lower rebar connecting hole, grouting interface and pulp interface are connected to lower rebar connecting hole, grouting interface and pulp interface are respectively provided with pipeline, pipeline tapping is located at parapet surface, pipeline, mortar is filled in lower rebar connecting hole and gap.The parapet connection structure short construction period, quality be easier to ensure that, is protected from environmental small, the problems such as being less prone to leakage, hollowing.
Description
Technical field
The utility model relates to construction engineering technical field more particularly to prefabricated assembled parapet connection structures.
Background technique
Parapet is the parapet of building roof all around, and main function can also apply anti-in addition to safeguarding safety in bottom
Hydraulic pressure brick receives head, to avoid waterproof layer infiltration or roof rain water cross flow.According to national building code requirement, accessible roof daughter
Wall height must not generally be lower than 1.1m, and highest is not greater than 1.5m.
Conventional parapet construction generallys use cast-in-place mode, and cast-in-place mode is due to its process limitation, inevitably
Cause the more, manpower of the infiltration of long in time limit, component, cracking, hollowing and other issues expend greatly, construction site environment is poor, waste material mostly etc.
Problem.
Utility model content
The purpose of this utility model is that for parapet long construction period, component easily occur leaking, open in the prior art
It splits, hollowing, the problems such as manpower consumption is big, and construction site environment difference fertilizer is more, proposes a kind of prefabricated assembled parapet connection
Structure.
For the attainment of one's purpose, technical solution provided by the utility model are as follows:
The utility model relates to a kind of prefabricated assembled parapet connection structure comprising parapet (1) and cast-in-place room
Face nose girder (2)；The top surface of the cast-in-site roof nose girder (2) is equipped with vertical reinforcement (21)；The parapet (1) is located at cast-in-place
The top of roofing nose girder (2), there are gap (6) between parapet (1) and cast-in-site roof nose girder (2), gap (6) outermost is equipped with
Cement base joint seal seat (3), the bottom end of parapet (1) are additionally provided with grout sleeve (4), and grout sleeve (4) includes upper reinforcement connection
Hole (41), lower rebar connecting hole (42), grouting interface (43) and pulp interface (44), upper reinforcement connecting hole (41) and daughter
Portion's reinforcing bar (11) connects within the walls, and vertical reinforcement (21) is inserted into lower rebar connecting hole (42), and the diameter of vertical reinforcement (21) is small
In the aperture of lower rebar connecting hole (42), it is in the milk interface (43) and pulp interface (44) connects with lower rebar connecting hole (42)
Logical, grouting interface (43) and pulp interface (44) are respectively equipped with grout lines (5) and pulp pipeline (7), grout lines (5) and out
The opening of slurry pipeline (7) is each provided at parapet (1) surface, grout lines (5), pulp pipeline (7), lower rebar connecting hole (42)
And mortar is filled in gap (6).
Preferably, the grout sleeve (4) is divided into inside and outside two groups, the grouting interface (43) of two groups of grout sleeves (4) and
Pulp interface (44) is each provided on the outer wall of grout sleeve (4)；It is connected in inside grout sleeve grouting interface (43) and pulp interface
(44) opening of grout lines (5) and pulp pipeline (7) at is each provided at the medial surface of parapet (1), is connected in outside grouting set
Cylinder grouting interface and the grout lines (5) of pulp interface and the opening of pulp pipeline (7) are each provided at the outside of parapet (1)
Face.
Preferably, the grout sleeve (4) is divided into inside and outside two groups, the grouting interface (43) of inside grout sleeve (4) and
Pulp interface (44) is each provided on the outer wall of grout sleeve (4), is connected in inside grout sleeve grouting interface and pulp interface
The opening of grout lines (5) and pulp pipeline (7) is located at the medial surface of parapet (1)；Outside grout sleeve (4) does not set grouting and connects
Mouth (43), pulp interface (44) are located on the outer wall of grout sleeve (4), are connected in the pulp of outside grout sleeve pulp interface (44)
The opening of pipeline (7) is located at the medial surface of parapet.
Preferably, the pulp pipeline (7) of connection outside grout sleeve pulp interface (44) includes the metal tube (71) of two sides
With intermediate hose (72), metal tube (71) and hose (72) join end to end, and hose bypasses the grout sleeve (4) of inside.
Preferably, the height of the gap (6) is 20mm.
Using technical solution provided by the utility model, compared with prior art, have the following beneficial effects:
The utility model parapet is connected by the vertical reinforcement at the top of its internal grout sleeve and cast-in-site roof nose girder
It connects, and the gap between the gap of vertical reinforcement and grout sleeve, parapet and cast-in-site roof nose girder is filled with mortar, it should
The problem of parapet is connected to form entirety by structure with cast-in-site roof nose girder, and bonding strength is big, is less prone to infiltration and cracking.
The utility model relates to parapet be precast construction, compared with cast-in-place parapet, when prefabricated parapet construction
It is not protected from environmental, flatness, intensity etc. are superior to cast-in-place parapet, the problem of being less prone to hollowing, and scene only needs
Will be by lifting and grouting the step of, short construction period.
Detailed description of the invention
Fig. 1 is the attachment structure schematic diagram of prefabricated assembled parapet connection structure described in embodiment one；
Fig. 2 is the fractionation structural representation of prefabricated assembled parapet connection structure described in embodiment one；
Fig. 3 is the sectional view of inside and outside side grout sleeve in embodiment one；
Fig. 4 is the attachment structure schematic diagram of prefabricated assembled parapet connection structure described in embodiment two；
Fig. 5 is the sectional view of two China and foreign countries side grout sleeve of embodiment；
Fig. 6 is the schematic diagram that the pipeline of pulp interface is connected in embodiment two.
It illustrates: 1- parapet, 2- cast-in-site roof nose girder, 3- cement base joint seal seat, 4- grout sleeve, 5- grout pipe
Road, the gap 6-, 7- pulp pipeline, 21- vertical reinforcement, 41- upper reinforcement connecting hole, 42- lower rebar connecting hole, 43- grouting
Interface, 44- pulp interface, 71- metal tube, 72- hose.
Specific embodiment
For the content for further appreciating that the utility model, the utility model is described in detail in conjunction with the embodiments, it is real below
Example is applied for illustrating the utility model, but is not intended to limit the scope of the present invention.
Embodiment one:
In conjunction with shown in attached drawing 1 and attached drawing 2, the utility model relates to a kind of prefabricated assembled parapet connection structure, packet
Include parapet 1 and cast-in-site roof nose girder 2.The top surface of the cast-in-site roof nose girder 2 is equipped with vertical reinforcement 21, and vertical reinforcement 21 is pre-
It is embedded in cast-in-site roof nose girder 2, and is connect with the reinforcing bar inside cast-in-site roof nose girder 2.
The parapet 1 is precast construction, and inside and outside two layers of inside reinforcing bar is equipped in parapet, and internal reinforcing bar uses screw thread
Steel.The parapet 1 is located at the top of cast-in-site roof nose girder 2, and there are the gaps 20mm between parapet 1 and cast-in-site roof nose girder 2
6,6 outermost of gap is equipped with cement base joint seal seat 3, plays the role of support and sealing, the upper and lower surface point of cement base joint seal seat 3
It is not in close contact with the bottom surface of parapet 1 and the top surface of cast-in-site roof nose girder 2.The bottom end of parapet 1 is additionally provided with grout sleeve
4, grouting sleeve 4 divides two layers inside and outside, and the structure of inside and outside two layers of grouting sleeve in the present embodiment is identical, and with attached drawing 2 and 3
Shown, grout sleeve 4 includes upper reinforcement connecting hole 41, lower rebar connecting hole 42, be in the milk interface 43 and pulp interface 44, on
Portion's reinforcing bar connecting hole 41 is connect with reinforcing bar 11 inside parapet, and vertical reinforcement 21 is inserted into lower rebar connecting hole 42, this is vertical
The diameter of reinforcing bar 21 is less than the aperture of lower rebar connecting hole 42, therefore there is also gaps for 21 outer ring of vertical reinforcement, and the gap with
Gap 6 between parapet 1 and cast-in-site roof nose girder 2 is that interconnected, described grouting interface 43 and pulp interface 44 are equal
It is connected to lower rebar connecting hole 42, is respectively set at the grouting interface 43 and pulp interface 44 on the grouting sleeve 4 in interior outside
Grout lines 5 and pulp pipeline 7, the grout lines 5 and pulp pipeline 7 are all made of metal tube, are connected on the grouting sleeve 4 of inside
Grout lines 5 and the opening of pulp pipeline 7 flushed with the medial surface of parapet 1, the grouting being connected on the grouting sleeve 4 of outside
The opening of pipeline 5 and pulp pipeline 7 is flushed with the lateral surface of parapet 1.Grout lines 5, pulp pipeline 7, lower rebar connection
Mortar is filled in gap between hole 42 and vertical reinforcement 21, in parapet 1 and the gap 6 of cast-in-site roof nose girder 2.
The construction method of the prefabricated assembled parapet connection structure that the present embodiment is related to the following steps are included:
Step 1, prefabrication parapet 1: reinforcing bar inside binding parapet, parapet inside reinforcing bar use screw-thread steel, even
Connect internal reinforcing bar and grouting sleeve 4, it is only necessary to which the top of internal reinforcing bar is screwed into tapped upper reinforcement connecting hole 41
, then grout lines 5 and pulp pipeline 7 are separately mounted in the grouting interface 43 and pulp interface 44 of grouting sleeve 4,
Then the template of parapet 1, grout lines 5 and pulp pipeline 7 are installed and is close to template close to the port of two side templates, prevents daughter
When wall concreting, the blocking of grout lines 5 and pulp pipeline 7 is caused, casting concrete forms parapet 1, form removal
Afterwards, the opening of two sides grout lines 5 and pulp pipeline 7 is flushed with outside in parapet；
Step 2, site operation cast-in-site roof nose girder 2: the steel reinforcement cage of binding cast-in-site roof nose girder 2, by vertical reinforcement 21
Bottom end is welded in steel reinforcement cage, then formwork casting concrete, and demoulding forms cast-in-site roof nose girder 2, and vertical reinforcement after maintenance
21 top is pierced by the surface of cast-in-site roof nose girder 2；
Step 3 lifts parapet 1: parapet 1 is hung 2 top of cast-in-site roof nose girder, the lower rebar of grouting sleeve 4
It is put down after 42 face vertical reinforcement 21 of connecting hole, lower section to 1 bottom surface of parapet is apart from the 2 surface position 20mm of cast-in-site roof nose girder
When, cement base joint seal seat 3 is set, and then gap 6 is formed between parapet 1 and cast-in-site roof nose girder 2；
Step 4, grouting: being in the milk from the opening of the grout lines of inside and outside side grouting sleeve 4 respectively, until mortar is from out
It starches when being sprayed at pipeline 7, with the grout lines 5 and pulp pipeline 7 of plug two sides, until mortar hardening, in grout lines
5, in the gap between pulp pipeline 7, portion's reinforcing bar connecting hole 42 and vertical reinforcement 21, between parapet 1 and cast-in-site roof nose girder 2
Screed is formed in gap 6.
Embodiment two:
In conjunction with shown in attached drawing 4, the utility model relates to a kind of prefabricated assembled parapet connection structure, including parapet
1 and cast-in-site roof nose girder 2.The top surface of the cast-in-site roof nose girder 2 is equipped with vertical reinforcement 21, and vertical reinforcement 21 is embedded in cast-in-place
In roofing nose girder 2, and it is connect with the reinforcing bar inside cast-in-site roof nose girder 2.
The parapet 1 is precast construction, and inside and outside two layers of inside reinforcing bar is equipped in parapet, and internal reinforcing bar uses screw thread
Steel.The parapet 1 is located at the top of cast-in-site roof nose girder 2, and there are the gaps 20mm between parapet 1 and cast-in-site roof nose girder 2
6,6 outermost of gap be equipped with cement base joint seal seat 3, the upper and lower surface of cement base joint seal seat 3 respectively with the bottom surface of parapet 1 and
The top surface of cast-in-site roof nose girder 2 is in close contact.The bottom end of parapet 1 is additionally provided with grout sleeve 4, and grouting sleeve 4 is also divided to inside and outside two
Layer.Wherein, the structure of the grouting sleeve 4 of inside is the same as example 1, and the grout sleeve 4 of inside includes upper reinforcement connecting hole
41, lower rebar connecting hole 42, grouting interface 43 and pulp interface 44, upper reinforcement connecting hole 41 and the inside on the inside of parapet
Reinforcing bar 11 connects, in the lower rebar connecting hole 42 of the insertion of the vertical reinforcement 21 inside grouting sleeve 4 of inside, the vertical reinforcement 21
Diameter be less than the aperture of lower rebar connecting hole 42, therefore there is also gaps for 21 outer ring of vertical reinforcement, and the gap and parapet 1
Gap 6 between cast-in-site roof nose girder 2 be interconnected, described grouting interface 43 and pulp interface 44 with lower part steel
Muscle connecting hole 42 is connected to, and 5 He of grout lines is respectively set at the grouting interface 43 and pulp interface 44 on the grouting sleeve 4 of inside
Pulp pipeline 7, grout lines 5 and pulp pipeline 7 are all made of metal tube, and the inner opposite end of metal tube and parapet inner surface are neat
It is flat.The structure of the grouting sleeve 4 in outside is as shown in Fig. 5, and outside grout sleeve 4 does not set grouting interface, and pulp interface is only arranged
44, pulp interface 44 is located on the outer wall of grout sleeve 4, the knot of the pulp pipeline 7 of connection outside grout sleeve pulp interface 44
Structure is as shown in Fig. 6, and the metal tube 71 including two sides and intermediate hose 72, metal tube 71 and hose 72 join end to end, hose
72 bypass the grout sleeve 4 of inside, and the opening of the metal tube 71 far from outside grouting sleeve 4 is flushed with the inner surface of parapet 1,
In gap between pulp pipeline 7, lower rebar connecting hole 42 and vertical reinforcement 21, between parapet 1 and cast-in-site roof nose girder 2
Mortar is filled in gap 6.
The construction method of the prefabricated assembled parapet connection structure that the present embodiment is related to the following steps are included:
Step 1, prefabrication parapet 1: reinforcing bar inside binding parapet, parapet inside reinforcing bar use screw-thread steel, even
Connect internal reinforcing bar and grouting sleeve 4, it is only necessary to which the top of internal reinforcing bar is screwed into tapped upper reinforcement connecting hole 41
, then grout lines 5 and pulp pipeline 7 are separately mounted to the grouting interface 43 and pulp interface of inside grouting sleeve 4
At 44, the combined type pulp pipeline that metal tube 71 and the combination of hose 72 are formed is connected to the pulp interface of outside grouting sleeve 4
At 44, the template of parapet 1 is then installed, the port of grout lines 5 and pulp pipeline 7 on inside and outside side grouting sleeve 4 is tight
Patch inner side template, prevents parapet concreting from resulting in blockage, casting concrete, formation parapet 1, interior after form removal
It is flushed on the inside of the grout lines 5 of outer grouting sleeve 4 and the opening of pulp pipeline 7 and parapet；
Step 2, site operation cast-in-site roof nose girder 2: the steel reinforcement cage of binding cast-in-site roof nose girder 2, by vertical reinforcement 21
Bottom end is welded in steel reinforcement cage, then formwork casting concrete, and demoulding forms cast-in-site roof nose girder 2, and vertical reinforcement after maintenance
21 top is pierced by the surface of cast-in-site roof nose girder 2；
Step 3 lifts parapet 1: parapet 1 is hung 2 top of cast-in-site roof nose girder, the lower rebar of grouting sleeve 4
It is put down after 42 face vertical reinforcement 21 of connecting hole, lower section to 1 bottom surface of parapet is apart from the 2 surface position 20mm of cast-in-site roof nose girder
When, cement base joint seal seat 3 is set, and then gap 6 is formed between parapet 1 and cast-in-site roof nose girder 2；
Step 4, grouting: for the compactness for improving screed, reducing the waste of mortar, before grouting, pulp pipeline 7
End connects a grout outlet, which connect with pulp pipeline 7, and other end sealing, tube wall is equipped with several grouts
Hole, from the opening grouting of the grout lines 5 of connection inside grouting interface 43, grouting interface of the mortar from inside grouting sleeve 4
43 enter, and part mortar flows to the lower rebar connecting hole of outside grouting sleeve 4 from flowing downward from gap 6, finally from even
5 position of pulp pipeline for connecing the pulp interface 44 of grouting sleeve 4 on the outside sprays；Part mortar then flows up, directly from interior
The pulp pipeline 7 of side grouting sleeve 4 sprays, and after grouting, grout outlet is removed, and with plug grout lines 5 and goes out
Starch pipeline 7 opening, until in mortar hardening, the gap between pipeline 5, portion's reinforcing bar connecting hole 42 and vertical reinforcement 21, female
Screed is formed in the gap 6 of youngster's wall 1 and cast-in-site roof nose girder 2.
Due to being hanging on the outside of parapet, it has not been convenient to it is in the milk, it can be on the inside of parapet using the scheme of embodiment two
The grouting of inside and outside grouting sleeve 4 is completed to construct more convenient relatively for embodiment one.
The utility model is described in detail in conjunction with the embodiments above, but the content be only the utility model compared with
Good embodiment, should not be considered as limiting the scope of the present invention.It is made according to the scope of application of this utility model
All the changes and improvements etc. should all be still fallen within the patent covering scope of the utility model.
Claims (5)
1. a kind of prefabricated assembled parapet connection structure, it is characterised in that: it includes parapet (1) and cast-in-site roof nose girder
(2)；The top surface of the cast-in-site roof nose girder (2) is equipped with vertical reinforcement (21)；The parapet (1) is located at cast-in-site roof and leads
The top of beam (2), there are gap (6) between parapet (1) and cast-in-site roof nose girder (2), gap (6) outermost is equipped with cement base
Joint seal seat (3), the bottom end of parapet (1) are additionally provided with grout sleeve (4), grout sleeve (4) include upper reinforcement connecting hole (41),
Lower rebar connecting hole (42), be in the milk interface (43) and pulp interface (44), inside upper reinforcement connecting hole (41) and parapet
Reinforcing bar (11) connection, vertical reinforcement (21) are inserted into lower rebar connecting hole (42), and the diameter of vertical reinforcement (21) is less than lower part
The aperture of reinforcing bar connecting hole (42), is in the milk interface (43) and pulp interface (44) is connected to lower rebar connecting hole (42), fills
Slurry interface (43) and pulp interface (44) are respectively equipped with grout lines (5) and pulp pipeline (7), grout lines (5) and grout outlet
The opening in road (7) is each provided at parapet (1) surface, grout lines (5), pulp pipeline (7), lower rebar connecting hole (42) and
Mortar is filled in gap (6).
2. prefabricated assembled parapet connection structure according to claim 1, it is characterised in that: the grout sleeve
(4) it is divided into inside and outside two groups, the grouting interface (43) and pulp interface (44) of two groups of grout sleeves (4) are each provided at grout sleeve (4)
Outer wall on；The grout lines (5) and pulp pipeline being connected in inside grout sleeve grouting interface (43) and pulp interface (44)
(7) opening is each provided at the medial surface of parapet (1), is connected in the grout pipe of outside grout sleeve grouting interface and pulp interface
The opening of road (5) and pulp pipeline (7) is each provided at the lateral surface of parapet (1).
3. prefabricated assembled parapet connection structure according to claim 1, it is characterised in that: the grout sleeve
(4) two groups inside and outside being divided into, the grouting interface (43) and pulp interface (44) of inside grout sleeve (4) are each provided at grout sleeve (4)
Outer wall on, be connected in inside grout sleeve grouting interface and pulp interface grout lines (5) and pulp pipeline (7) opening
It is located at the medial surface of parapet (1)；Outside grout sleeve (4) does not set grouting interface (43), and pulp interface (44) is located at grouting set
On the outer wall of cylinder (4), the opening for being connected in the pulp pipeline (7) of outside grout sleeve pulp interface (44) is located at the inside of parapet
Face.
4. prefabricated assembled parapet connection structure according to claim 3, it is characterised in that: connection outside grout sleeve
The pulp pipeline (7) of pulp interface (44) includes the metal tube (71) of two sides and the hose (72) of centre, metal tube (71) and soft
Pipe (72) joins end to end, and hose bypasses the grout sleeve (4) of inside.
5. prefabricated assembled parapet connection structure according to claim 1, it is characterised in that: the gap (6)
Height is 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821738074.5U CN208981531U (en) | 2018-10-25 | 2018-10-25 | A kind of prefabricated assembled parapet connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821738074.5U CN208981531U (en) | 2018-10-25 | 2018-10-25 | A kind of prefabricated assembled parapet connection structure |
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| Publication Number | Publication Date |
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| CN208981531U true CN208981531U (en) | 2019-06-14 |
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ID=66788944
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| CN201821738074.5U Active CN208981531U (en) | 2018-10-25 | 2018-10-25 | A kind of prefabricated assembled parapet connection structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734024A (en) * | 2020-06-24 | 2020-10-02 | 南京市第八建筑安装工程有限公司 | Lightweight concrete ceramic thick plate curtain wall and mounting method thereof |
| CN111997204A (en) * | 2020-08-20 | 2020-11-27 | 全学友 | Transverse position-adjustable assembled vertical component connecting structure and construction method thereof |
| CN113026804A (en) * | 2021-03-23 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | Spring lock assembly, prefabricated part connecting node and assembled underground station |
| CN113026805A (en) * | 2021-03-23 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | Grouting prefabricated part connecting node structure and assembled underground station |
| CN114278018A (en) * | 2021-11-29 | 2022-04-05 | 中建八局第一建设有限公司 | L-shaped decoration integrated prefabricated parapet installation method |
| CN115928889A (en) * | 2022-11-16 | 2023-04-07 | 黑龙江省黑建一建筑工程有限责任公司 | Grouting construction method for steel bar sleeve of non-separated pre-buried grouting pipe |
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2018
- 2018-10-25 CN CN201821738074.5U patent/CN208981531U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734024A (en) * | 2020-06-24 | 2020-10-02 | 南京市第八建筑安装工程有限公司 | Lightweight concrete ceramic thick plate curtain wall and mounting method thereof |
| CN111997204A (en) * | 2020-08-20 | 2020-11-27 | 全学友 | Transverse position-adjustable assembled vertical component connecting structure and construction method thereof |
| CN111997204B (en) * | 2020-08-20 | 2021-12-17 | 全学友 | Transverse position-adjustable assembled vertical component connecting structure and construction method thereof |
| CN113026804A (en) * | 2021-03-23 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | Spring lock assembly, prefabricated part connecting node and assembled underground station |
| CN113026805A (en) * | 2021-03-23 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | Grouting prefabricated part connecting node structure and assembled underground station |
| CN114278018A (en) * | 2021-11-29 | 2022-04-05 | 中建八局第一建设有限公司 | L-shaped decoration integrated prefabricated parapet installation method |
| CN115928889A (en) * | 2022-11-16 | 2023-04-07 | 黑龙江省黑建一建筑工程有限责任公司 | Grouting construction method for steel bar sleeve of non-separated pre-buried grouting pipe |
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