CN208088668U - A kind of full grout sleeve of bar connecting - Google Patents
A kind of full grout sleeve of bar connecting Download PDFInfo
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- CN208088668U CN208088668U CN201721879446.1U CN201721879446U CN208088668U CN 208088668 U CN208088668 U CN 208088668U CN 201721879446 U CN201721879446 U CN 201721879446U CN 208088668 U CN208088668 U CN 208088668U
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Abstract
The utility model discloses a kind of full grout sleeves of bar connecting, including the first grout sleeve and the second grout sleeve, first grout sleeve and the second grout sleeve are screwed on by screw thread, first grout sleeve is equipped with grout hole, second grout sleeve is equipped with plasma discharge hole, and two grout sleeves are fixedly connected by pouring into the grouting material in grout sleeve with connected reinforcing bar；The outer diameter of first grout sleeve is more than the outer diameter of the second grout sleeve, first grout sleeve is equipped with internal thread, second grout sleeve is equipped with external screw thread, first grout sleeve and the threaded ends of the second grout sleeve are respectively equipped with the identical inspection hole of a size, the inspection hole that one inspection screw or pin first pass through the first grout sleeve enters back into the inspection hole of the second grout sleeve, and inspection hole is with grout hole and plasma discharge hole in the same side of grout sleeve.It can quickly examine the connection of two-stage grouting bush whorl whether qualified using the full grout sleeve of the utility model, to improving construction quality and ensureing that structure plays safely positive effect.
Description
Technical field
The utility model is related to a kind of full grout sleeves of bar connecting, belong to prefabricated concrete structure precast concrete
The bar connecting technical field of construction of component.
Background technology
National standard《Prefabricated concrete structure building standard》GB/T51231, national sector standard《Assembly concrete
Structure technology regulation》JGJ1 has carried out pertinent regulations, wherein reinforcing bar to the connecting method for reinforcing bars used in precast concrete
Sleeve grouting connection is the connection method that stress main reinforcement mainly uses.Since concrete structure building is in service phase, structure will
All kinds of load are born, when the main steel bar stress in concrete is stretched or stretches and compresses the load of combination, such as in reinforcing bar
Excessive residual deformation is generated on jointing, it is possible to so that the concrete around connector is generated cracking, when crack width reaches
When objectionable level, pernicious gas or liquid are entered by gap, and corrosion attack is caused to reinforcing bar, and the concrete structure will be made to build
The service life of building body reduces.National sector standard《Reinforced bar sleeve grouting connection application technology regulation》JGJ355 is to reinforced bar sleeve
The application of grouting connection construction and examination propose related request, and the residual deformation regulation in butt joint deformation performance refers specifically to
Mark, national sector standard《Mechanical connection technique of reinforcement regulation》JGJ 107 also has reinforced bar mechanical connector regulation similar residual
Remaining deformation index request.In order to ensure that connector meets requirements above, 107 standards of current J GJ carry straight thread connector installation quality
Go out following requirements:" steel bar head should mutually be held out against in sleeve middle position when erection joint ... ..., to can not to top its
His straight thread connector should add locking nut, hold out against the measures such as boss fastening ", steel bar head to push up and add nut check and
It is the screw thread pair fit clearance reduced using the splice being threadedly coupled that the purpose for holding out against the measures such as boss, which is arranged, makes connector
Residual deformation performance reaches standard set quota.
But that is at present applied in prefabricated concrete structure engineering a kind of is composed using thread connecting mode
Reinforcing bar grouting branch sleeve especially needs a kind of beam assembled at the construction field (site) with split type full grout sleeve connection
Splice, there is joint connection in site constructions how to ensure the problem of bush whorl fit clearance is met the requirements, such as：Chinese patent
The split type full grout sleeve connector of one kind that CN 105317168A are proposed, the sleeve are logical with branch sleeve in installation connection station
It crosses screw thread left and right grout sleeve links together.Connector sleeve and sleeve external screw thread tail portion shoulder and company may be used in the connector
The locking mode that female connector outer end face is mutually held out against, the lock that left and right grout sleeve can also be used to be held out against in the middle part of its branch sleeve
Tight mode, the former is convenient for checking, directly by whether exposed threads judge whether screw thread has held out against, but is connect since screw thread is located at
Centriciput is that connector bears the maximum region of load, and bush whorl pair section will generate flexible deformation when connector tension, and elasticity becomes
Bush whorl pair section can extend when shape, and the branch sleeve and sleeve external screw thread tail portion boss mutually tightened originally hold out against mating surface just
It can detach, after largely applying tension and compression or tensile load repeatedly, the screw thread pair of locking will generate relative movement, and two hold out against mating surface
That is separation forever, no longer has lock feature, causes joint distortion performance to decline, therefore, this kind of connector is mostly used equipped with outer spiral shell
The sleeve end face of line is mutually held out against in branch sleeve, and also there are partial threads outside branch sleeve for external screw thread tail portion.In this way, this
It is identical as the requirement principle that JGJ107 requires straight thread silk head mutually to be held out against in sleeve center when the connector connection of kind sleeve, left,
Right grout sleeve should be held out against in the middle part of its branch sleeve.And Practical Project construction in, the sleeve be frequently utilized for precast beam with it is prefabricated
Between beam, it is attached in the smaller region in space, it is very inconvenient using spanner rotational sleeve, once operator cannot be by
Code requirement operation cannot apply screw-down torque as defined in reaching when tightening and make, even if left and right grout sleeve is by branch sleeve
It links together, but does not hold out against and reach design screw-down torque mutually, reviewer also is difficult to inspection torque spanner again
Sleeve is tightened to examine, this problem sleeve can not just be corrected for again after connector completes grouting, and connector connects at this time
Larger gap is certainly existed on the screw thread deputy thread of two sleeves, can not ensure that connector meets JGJ 355 and 107 standards of JGJ regulation
Residual deformation performance requirement, connector becomes the hidden danger of structure safe mass.
The present inventor sees Chinese patent CN 104533021A it is proposed that a kind of full grout sleeve of the bar connecting of two-piece type,
The first grout sleeve and the second grout sleeve of the sleeve are directly connected to by screw thread, avoid CN 105317168A with one
When branch sleeve connection two grout sleeves in left and right, depth inconvenience that both ends bush whorl is screwed into branch sleeve control is asked
Topic, while the connection screw thread of sleeve body is optimized for one section by two sections, in same thread parameter, same machining accuracy and tighten
Under torque, the reinforcing bar grouting connector of the connection of CN 104533021A is because of only one section of screw thread, remaining deformation caused by screw thread
To the half of CN 105317168A connectors be formed with two sections of screw threads, therefore just there is more preferably joint performance, or pass through
Both the above sleeve is tightened, under the performance condition that connector has same residual deformation value, the adapter sleeve of CN 104533021A
The screw-down torque lower than CN 105317168A can be used, reach same switching performance, thus reduce the work of joint connection in site
Industry difficulty, production efficiency higher of constructing.But when the connector uses straight screw connection mode, two sleeves are in connection screw thread hole bottom
The structure held out against in boss, or by the way of taper thread connection, it is equipped with the screw thread of the second grout sleeve of external thread sleeve
Tail portion is exposed at the first grout sleeve threaded hole outer end face equipped with matched internal thread hole, i.e., there is also two sleeve connections
Afterwards, it is difficult to by exposed threads tail length situation, judge screw thread pair internal end surface and the deficiency whether boss has mutually held out against.
Invention content
To solve above-mentioned the deficiencies in the prior art, the utility model provides a kind of full grout sleeve of bar connecting.
The technical solution of the utility model is as follows：
A kind of full grout sleeve of bar connecting, including the first grout sleeve and the second grout sleeve, first grouting
Sleeve and second grout sleeve are screwed on by screw thread, and first grout sleeve is equipped with grout hole, second grouting
Sleeve is equipped with plasma discharge hole, and two grout sleeves are fixedly connected by pouring into the grouting material in grout sleeve with connected reinforcing bar；
The outer diameter of first grout sleeve is more than the outer diameter of the second grout sleeve, and the first grout sleeve is equipped with internal thread,
Second grout sleeve is equipped with external screw thread, and the threaded ends of first grout sleeve and the second grout sleeve are respectively equipped with one
The inspection hole that the identical inspection hole of size, an inspection screw or pin first pass through the first grout sleeve enters back into the second grout sleeve
Inspection hole, the inspection hole and the grout hole and plasma discharge hole are in the same side of grout sleeve.
Preferably, first grout sleeve and second grout sleeve are by carbon structural steels, structural alloy steel, no
Steel pipe made of rust steel, corrosion-resisting steel, spheroidal graphite cast-iron, cast steel or cast alloy steel.
Preferably, a diameter of 2mm-10mm of the inspection hole.
Preferably, described to check that the diameter of screw or pin is smaller 0.1mm-2mm than the diameter of inspection hole.
Preferably, after the inspection screw or the pin insertion inspection hole reach depth capacity, screw or pin are checked
The tail portion for being exposed at grout sleeve outer surface is not shorter than 3mm.
Preferably, first grout sleeve is connect with the second grout sleeve by straight screw connection or taper thread.
Preferably, when the first grout sleeve and the second grout sleeve pass through straight screw connection, the first grout sleeve it is interior
The bottom of thread is equipped with the second grout sleeve of limitation and continues the limit shoulder being screwed into.
Preferably, projected length of the straight thread of first grout sleeve on grout sleeve axis is less than or equal to the
Projected length of the two grout sleeve straight threads on grout sleeve axis.
Preferably, the outer end opening of first grout sleeve and the second grout sleeve is equipped with card slot or boss, institute
It states card slot or boss is used to install the rubber seal of sealing grouting material.
Preferably, it is installed at the card slot or boss of the outer end opening of first grout sleeve and the second grout sleeve
There is rubber seal.
The technical principle of the utility model is：After the completion of two-stage grouting sleeve produces, it is together by a threaded connection, and
It tightens and processes an inspection hole for running through two grout sleeve side walls in threaded ends again after reaching setting screw-down torque value；Grouting
When sleeve is installed and used at the scene, split after the opposite direction rotation that two grout sleeves are tightened by screw thread, it will connecting station
Two sleeves be separately mounted to two wait connect it is end reinforced after, then again through screw thread by two sleeve connections, the second grouting set
After the external screw thread of cylinder is screwed onto the internal thread hole bottom of the first grout sleeve, it will check that screw or pin are inserted into the first grout sleeve
Inspection hole, and enter in the inspection hole of the second grout sleeve, the Screw Thread Fit Clearance of two grout sleeves is restored in work at this time
Near factory's state when assembled, the thread pitch of sleeve can meet design requirement.
The utility model tool has the advantage that：
The grout sleeve of the utility model is in use, two grout sleeves re-assembly together, the second grout sleeve precession
After in the internal thread hole of first grout sleeve, the second grout sleeve end of thread axis end face is threaded through the first grout sleeve internal thread segment
Inspection hole after, be inserted into the inspection hole of the first grout sleeve and check screw or pin, such as check that screw or pin cannot be into
In the inspection hole for entering the second grout sleeve, then the screw-thread fit of the sleeve does not meet design requirement, it is possible to determine that the screw thread of sleeve
Quality of connection is unqualified.The threaded connection of sleeve is up-to-standard if the inspection hole that can enter the second grout sleeve.
When sleeve installs quality of connection qualification, sleeve is completed after being in the milk from inspection hole and the gap for checking screw or pin
A small amount of grouting material may be leaked out, before grouting material hardening, inspection personnel can check that screw or pin are exposed in the first grout sleeve
Length, judge to check whether screw or pin have enter into the inspection hole of the second grout sleeve；If from the first grouting set
Whether the exposed length of cylinder exposed inspection screw or length of pin bad judgement sleeve installation qualification, then inspection screw can be extracted
Or pin, observation checks the insertion depth of screw meeting pin, to determine if to enter in the second grout sleeve inspection hole, by
This can determine whether the threaded connection of the connector of the grouting its of sleeve meets the requirements early period.
Using the above inspection and determination method when the grout sleeve joint connection in site of the utility model, connector can effectively ensure that
Quality of connection, to improve construction quality and ensure structure play positive effect safely.
Description of the drawings
Fig. 1 is the full grout sleeve attachment structure schematic diagram of straight thread detachable of the utility model；
Fig. 2~Fig. 5 is that the work that the full grout sleeve of straight thread detachable of the utility model is installed and connected is shown
It is intended to；
Fig. 6 be the utility model the installation of taper thread detachable full grout sleeve and with the signal that connect reinforcement location
Figure；
Specific implementation mode
In conjunction with specific embodiment and attached drawing to the construction of the utility model, shape and the further details of explanation of feature.
It should be appreciated that the present embodiment is merely to illustrate the utility model, rather than limit the scope of protection of the utility model.
As shown in Figure 1, the bar connecting of the present embodiment full grout sleeve 1, including the first grout sleeve 11 and second fill
Sleeve 12 is starched, two grout sleeves pass through straight screw connection, wherein the threaded ends of the second grout sleeve 12 are equipped with outer straight spiral shell
The threaded ends of line, the first grout sleeve 11 are equipped with interior straight thread, and the first grout sleeve 11 sets grout hole 2, the second grouting set
Cylinder 12 sets plasma discharge hole 3, and the inspection hole 4 through two grout sleeve side walls, the grout hole are equipped in two grout sleeve threaded connection sections
2, the homonymy in sleeve is arranged in plasma discharge hole 3 and inspection hole 4, and the axis in three holes is in the same plane, two grout sleeves difference
It is fixedly connected with connected reinforcing bar 6 by pouring into the grouting material in the first grout sleeve 11 and the second grout sleeve 12.
The outer diameters of two grout sleeves is different, and the outer diameter of the first grout sleeve 11 is more than the outer diameter of the second grout sleeve 12, and two
Ferrule barrel respectively after processing is completed, factory's pre-assembly together, and tightened by matched, reach preset torque
After value, the end of thread axis end face equipped with externally threaded second grout sleeve 12, which acts against, sets female first grout sleeve
On the limit shoulder axial end face of 11 internal thread hole bottoms, if also dew has outside 11 axis end face of female first grout sleeve
The external screw thread of second grout sleeve 12；First grout sleeve 11 sets grout hole 2, and the second grout sleeve 12 sets plasma discharge hole 3, is filled two
It starches bush whorl linkage section and is equipped with the inspection hole 4 for running through two grout sleeve side walls, the grout hole 2, plasma discharge hole 3 and inspection hole 4 are set
The homonymy in sleeve is set, and the axis in three holes is in the same plane, the first grout sleeve 11 and the second grout sleeve 12 pass through
Straight screw connection becomes the full grout sleeve 1 of stair-stepping detachable, and mating inspection is inserted into the inspection hole 4 of two grout sleeves
Screw or pin 5 are looked into, sleeve can dispatch from the factory.
As shown in Figure 2 to 4, screw or pin 5 are checked in use, first pulling up, the first grout sleeve 11 and second is filled
Slurry sleeve 12 is reversely rotated, is dismantled, and the first grout sleeve 11 is sleeved on the longitudinally connected reinforcing bar 6 of a precast concrete beam
On, and connection reinforcing bar 6 is made to be inserted in the interior intracavitary of the first grout sleeve 11, then the second grout sleeve 12 is sleeved on another prefabricated mixed
On the longitudinally connected reinforcing bar 6 of solidifying Tu Goujianliang, connection reinforcing bar 6 is made to be inserted into the inner cavity of the second grout sleeve 12, it is then prefabricated by two
Beams of concrete is lifted into designated mounting connecting portion, and connection reinforcing bar 6 is in place with respective place prefabricated components, two steel bar ends
It is opposite and further in opposite directions to, axis almost coaxial, then by the first grout sleeve 11 and the second grout sleeve 12, make its threaded port
Relatively, the first grout sleeve 11 and the second grout sleeve 12 are rotated with hand or by pipe wrench, by the outer of the second grout sleeve 12
It is threaded into the internal thread hole of the first grout sleeve 11, waits for that the axis end face 8 of the male end of the second grout sleeve 12 passes through
After the inspection hole 4 of first grout sleeve 11, the grout hole 2 of the first grout sleeve 11, inspection hole 4 are gone in horizontal positioned
The surface of first grout sleeve, by mating the checking of this sleeve, screw or pin 5 are inserted into the inspection hole 4 of the first grout sleeve 11
It is interior, it is further continued for the second grout sleeve 12 being screwed into the threaded hole bottom of the first grout sleeve 11, until the second grout sleeve 12
Axis end face 8 act against on the axial end face 7 of threaded hole bottom limit shoulder of the first grout sleeve 11, then with two diameters
Less than the pulp that the rod iron of grout hole 2, slurry outlet 3 is inserted into the grout hole 2 of the first grout sleeve 11, the second grout sleeve 12 respectively
Hole 3 makes 12 relative rotation of the first grout sleeve 11 and the second grout sleeve by two rod irons of direction switching for tightening screw thread, and first
When the inspection hole 4 of grout sleeve 11 and the second grout sleeve 12 goes to coaxial position, check that screw or pin 5 are filled from first
The inspection hole 4 for starching sleeve 11 presses inspection screw or 5 tail end of pin by dead weight tenesmus or with hand, so that it is fallen and enters the second grouting
In the inspection hole 4 of sleeve 12, the first grout sleeve 11 connects work completion, grouting set with the installation of the second grout sleeve 12 at this time
Grout hole 2, the slurry outlet 3 at cylinder both ends are respectively positioned on above the sleeve being horizontally mounted, and then can be used sealing material to sleeve two
The gap of end bar and sleeve is sealed, and the requirement by JGJ355 standards to plasm pouring in plane connection construction carries out grouting company
It connects, until the grouting connection work of the sleeve terminates.
The material of first grout sleeve 11 and the second grout sleeve 12 is carbon structural steels, structural alloy steel, stainless steel, resistance to
Steel, spheroidal graphite cast-iron, cast steel, cast alloy steel are lost, the screw pitch of connection screw thread is 3.0mm.A diameter of 5mm of inspection hole 4 is checked
A diameter of 4mm of screw or pin 5 checks that screw or pin 5 are exposed at the tail portion outside the first grout sleeve after being inserted into inspection hole 4
Length is 5mm, such as extracts and checks screw or pin 5, it is seen that it is inserted into length of work segment in the first grout sleeve and is filled more than first
Starch wall thickness of the sleeve at this.
As shown in figure 5, two grout sleeves that straight thread is connected are used for the utility model, wherein the first grout sleeve 11
It is steel sleeve with the second grout sleeve 12, the equal rolling of appearance has groove, and hub internal bore is in interior table corresponding with appearance groove
Face position is equipped with protrusion, and the protrusion is in the groove of rolling outer surface, and bush material deforms and formed, and adjacent is convex
It rises and forms the shearing slot that grout sleeve inner cavity anchors grouting material, connection reinforcing bar.First grout sleeve and second
The connection method of grout sleeve is identical as above-mentioned straight thread connecting sleeve application method.
As shown in fig. 6, two grout sleeves that taper thread is connected are used for the utility model, wherein the first grout sleeve 11
Equipped with conical internal thread, the second grout sleeve 12 is equipped with conical external screw thread, the depth of conical internal thread set by the first grout sleeve 11
Degree is equal to or less than the axis of external thread length of the second grout sleeve 12 equipped with conical external screw thread, and two-stage grouting sleeve passes through cone
It is threadedly coupled, connection method is identical as above-mentioned straight thread connecting sleeve application method, and difference is：After installation is tightened, it is screwed into
The end of thread axis end face of second grout sleeve 12 of 11 internal thread hole of the first grout sleeve does not reach the first grout sleeve 11
The screw thread tail end of internal thread hole, but also have the distance of about 1 screw pitch apart from the screw thread tail end, and the first grout sleeve 11
Also dew has the external screw thread of the second grout sleeve 12 outside axis end face；The both ends of first grout sleeve 11 and the second grout sleeve 12
Endoporus port, which is equipped with, is tightly connected reinforcing bar 6 and hub internal bore gap, the rubber seal for preventing grouting material from being flowed out out of sleeve
9。
The description of the utility model is merely illustrative above, and not restrictive, those skilled in the art should be managed
Solution can carry out it within the spirit and scope that claim limits many modifications, variation or equivalent modification, but they are all
It will fall into the scope of protection of the utility model.
Claims (10)
1. a kind of full grout sleeve of bar connecting, which is characterized in that described including the first grout sleeve and the second grout sleeve
First grout sleeve and second grout sleeve are screwed on by screw thread, and first grout sleeve is equipped with grout hole, described
Second grout sleeve is equipped with plasma discharge hole, and two grout sleeves are fixed by pouring into the grouting material in grout sleeve with connected reinforcing bar
Connection；
The outer diameter of first grout sleeve be more than the second grout sleeve outer diameter, the first grout sleeve be equipped with internal thread, second
Grout sleeve is equipped with external screw thread, and the threaded ends of first grout sleeve and the second grout sleeve are respectively equipped with a size
The inspection hole that identical inspection hole, an inspection screw or pin first pass through the first grout sleeve enters back into the inspection of the second grout sleeve
Hole is looked into, the inspection hole is with the grout hole and plasma discharge hole in the same side of grout sleeve.
2. the full grout sleeve of bar connecting as described in claim 1, which is characterized in that first grout sleeve and described
Second grout sleeve is by carbon structural steels, structural alloy steel, stainless steel, corrosion-resisting steel, spheroidal graphite cast-iron, cast steel or cast alloy steel
Manufactured steel pipe.
3. the full grout sleeve of bar connecting as described in claim 1, which is characterized in that a diameter of 2mm- of the inspection hole
10mm。
4. the full grout sleeve of bar connecting as described in claim 1, which is characterized in that described to check the straight of screw or pin
Diameter is smaller 0.1mm-2mm than the diameter of inspection hole.
5. the full grout sleeve of bar connecting as described in claim 1, which is characterized in that the inspection screw or pin are inserted into
It is described to check that screw or pin are exposed at the tail portion of grout sleeve outer surface and are not shorter than 3mm after the inspection hole reaches depth capacity.
6. the full grout sleeve of bar connecting as described in claim 1, which is characterized in that first grout sleeve and second
Grout sleeve is connected by straight screw connection or taper thread.
7. the full grout sleeve of bar connecting as claimed in claim 6, which is characterized in that when the first grout sleeve and second fill
Slurry sleeve is when passing through straight screw connection, and the internal thread bottom of the first grout sleeve is equipped with what the second grout sleeve of limitation continued to be screwed into
Limit shoulder.
8. the full grout sleeve of bar connecting as claimed in claims 6 or 7, which is characterized in that first grout sleeve
Projected length of the straight thread on grout sleeve axis is less than or equal to the straight thread of the second grout sleeve in grout sleeve axis
On projected length.
9. such as the full grout sleeve of claim 1-7 any one of them bar connecting, which is characterized in that the first grouting set
The outer end opening of cylinder and the second grout sleeve is equipped with card slot or boss, and the card slot or boss are for installing sealing grouting material
Rubber seal.
10. the full grout sleeve of bar connecting as claimed in claim 9, it is characterised in that：First grout sleeve and
At the card slot or boss of the outer end opening of two grout sleeves, rubber seal is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721879446.1U CN208088668U (en) | 2017-12-28 | 2017-12-28 | A kind of full grout sleeve of bar connecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721879446.1U CN208088668U (en) | 2017-12-28 | 2017-12-28 | A kind of full grout sleeve of bar connecting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208088668U true CN208088668U (en) | 2018-11-13 |
Family
ID=64064972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721879446.1U Active CN208088668U (en) | 2017-12-28 | 2017-12-28 | A kind of full grout sleeve of bar connecting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208088668U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989529A (en) * | 2019-02-28 | 2019-07-09 | 上海应用技术大学 | A kind of spliced grout sleeve and building prefabricated components |
| CN111628459A (en) * | 2020-06-23 | 2020-09-04 | 扬州硕宇高压电气有限公司 | Cable installation base, manufacturing device and manufacturing method |
-
2017
- 2017-12-28 CN CN201721879446.1U patent/CN208088668U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109989529A (en) * | 2019-02-28 | 2019-07-09 | 上海应用技术大学 | A kind of spliced grout sleeve and building prefabricated components |
| CN109989529B (en) * | 2019-02-28 | 2021-02-02 | 上海应用技术大学 | Concatenation formula grout sleeve and building prefabricated component |
| CN111628459A (en) * | 2020-06-23 | 2020-09-04 | 扬州硕宇高压电气有限公司 | Cable installation base, manufacturing device and manufacturing method |
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