CN201991142U - Composite sleeve type rebar connecting device - Google Patents
Composite sleeve type rebar connecting device Download PDFInfo
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- CN201991142U CN201991142U CN2010205784243U CN201020578424U CN201991142U CN 201991142 U CN201991142 U CN 201991142U CN 2010205784243 U CN2010205784243 U CN 2010205784243U CN 201020578424 U CN201020578424 U CN 201020578424U CN 201991142 U CN201991142 U CN 201991142U
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- cushion cover
- connecting device
- sleeve
- reinforcing
- steel bar
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Abstract
The utility model relates to a composite sleeve type rebar connecting device which is arranged at the connecting joint of a connected rebar (1), and comprises an inner cushion cover (3) and a sleeve (4), wherein the inner cushion cover (3) is arranged between the connected rebar (1) and the sleeve (4), and the inner cushion cover (3) is fixedly connected with the sleeve (4). The utility model creatively puts forward a real solving manner with very strong operability, and has profound significance in engineering practice. The difference of anti-bending and anti-shearing performances of the composite sleeve type rebar connecting device in all directions is not great, and the strength is good; the requirement on the precision of a connecting piece is not high; thread and other structures can be prefabricated in advance; site operation only includes the operations of thread assembly, upsetting of the end part of a rebar 1 which is easy to operate, and pouring of filler and the like, and the construction period is short; and the combined composite sleeve is very short in axial lengh, and consumes less steel.
Description
Technical field
The utility model relates to building unit structure design and applied technical field, and a kind of combined sleeve formula reinforcing steel bar connecting device is provided especially.
Background technology
In the prior art, the connection of reinforcing bar can be used concrete grammars such as welding, colligation overlap joint, mechanical connection.The connection of prefabricated assembling type reinforced concrete member normally at first realizes the connection of reinforcing bar, puts the connection that realizes other parts again before this.For example, in the connection procedure of prefabricated units, at first carry out reinforcing bar and connect, and then carry out the operations such as cast connection of peripheral structures such as concrete.In actual engineering, consider the degree of reliability of economy and joint performance, in large diameter reinforcing bar connected, what above-mentioned three kinds of reinforcing bar connected modes use was maximum was the best mechanical connection of effect.
Typical mechanical connecting structure is that to be respectively 200910187357.4 and 200520000350.4 with application number be the structure that the Chinese patent literature of representative discloses in the prior art; Use sleeve pipe to connect the back simultaneously in addition connecting portion is carried out the method that cold extrusion is handled, so that have tensile strength after the connection that makes; Use syndetons such as taper thread, straight thread in addition in addition.But the following shortcoming of prior art ubiquity: 1) the system screw thread in the execute-in-place process, cold extrusion etc. are very high to the requirement of equipment; 2) operation to the workman requires height, and labour intensity is big; 3) power consumption is big, the cost height; 4) bending resistance of partially connected architecture has directionality, in a circumferential direction each to the bend resistance ability have comparatively significantly that fluctuation changes; 5) engineering time long, technique effect is relatively poor.
In the external existing sleeve grouting technique, the mode of using sleeve to be in the milk simultaneously realizes the connection (as shown in figure 17) between the reinforcing bar, and the constraint of the relative slippage between sleeve and the reinforcing bar is guaranteed by inserts; But because the shear resistance of inserts is limited, so inevitable requirement uses very long sleeve could satisfy basic performance requirement.
Be noted that especially, in prefabricated costruction, after lifting component puts in place, relative distance between the every pair of reinforcing bar that needs to connect that stretches out between the member is different (as shown in figure 18), so it is every at the steel bar end mantle fiber, and here infeasible of the connected mode of using sleeve, because on the internal thread of very difficult assurance sleeve and end reinforced external screw thread coincide, though can increase by one more axially adjusts apart from solving this problem with sleeve, but structure is obviously complicated, be equivalent to has increased a joint again in joint location more, and cost obviously improves, execute-in-place workload showed increased.
The total better combined sleeve formula of technique effect reinforcing steel bar connecting device after people expect to obtain.
The utility model content
The purpose of this utility model provides the better combined sleeve formula of a kind of technique effect reinforcing steel bar connecting device.Mainly the technical problem of Xie Jueing is: the key technical problem in the butt joint installation process of different building precast members that is the connectivity problem of reinforcing bar.
A kind of combined sleeve formula of the utility model reinforcing steel bar connecting device is arranged in the jointing place of connected reinforcing bar 1; It is characterized in that: described combined sleeve formula reinforcing steel bar connecting device is made of interior cushion cover 3, sleeve 4, wherein:
Combined sleeve formula reinforcing steel bar connecting device described in the utility model, also claimed following preferred content:
The branch body structure that cushion cover 3 is constituted by 2～8 parts in described, the line of demarcation between the each several part all is parallel to inner axis direction, and various piece is the part of the corresponding central angle of cross section smaller or equal to 180 ° ring-type; This requirement is in order to guarantee carrying out smoothly of outside combination.
When cushion cover 3 was the branch body structure that is constituted by 2 parts in described, the difference of the corresponding central angle of the cross section of 2 parts was smaller or equal to 10 °.That is two parts size of split can have any different slightly, and for example: one of them covers 180 ° of central angles, and another is smaller slightly.May have the slit between the two after the combination, this can simultaneously also for follow-up operations such as grouting provide condition, can realize operations such as cast inserts by means of structures such as slit or the holes of offering under lower assembly precision requires.
Fixedly connected concrete mode is to be threaded between described interior cushion cover 3 and the sleeve 4, and this is a kind of simple and convenient also comparatively reliable fixedly connected mode.
The packing material of in by the space between the reinforcing bar 1 of sealing mat 5, sleeve 4, interior cushion cover 3 and linkage section, annotating; With the slit in the inner space fill full after, whole assembly and connected two sections reinforcing bars 1 are connected to become an integral body that does not allow slippage each other, relative motion such as reverses, and have good tension and transverse property.
Described packing material is specially following one of several or its combination: cement mortar, grouting material, cement paste.Packing material satisfies following requirement: good fluidity (self-compaction), microdilatancy characteristic, high strength.
The linkage section proximal end of described connected piece reinforcing bar 1 is provided with and the distance of the reinforcing bar 1 axis structure greater than disconnected section bar cross section radius.Further preferably be specifically as follows reinforcing bar 1 end jumping-up, so that strengthen technique effect.
The linkage section proximal end of described connected piece reinforcing bar 1 is that be provided with satisfies following requirement with distance reinforcing bar 1 axis greater than the structure of disconnected section bar cross section radius:
The distance values of this structure and reinforcing bar 1 axis less than half of sleeve 4 internal diameter diameters simultaneously greater than half of the internal diameter of interior cushion cover 3, not high to the required precision of jumping-up section.
In the described combined sleeve formula reinforcing steel bar connecting device, be provided with sealing mat 5 at interior cushion cover 3 and place, the slit between the reinforcing bar 1 away from combined sleeve formula reinforcing steel bar connecting device center; So that guarantee the filling effect of inner inserts.
In the described combined sleeve formula reinforcing steel bar connecting device, when interior cushion cover 3 adopted two groups, the thread rotary orientation of two groups of interior cushion covers 3 was opposite.A kind of practical requirement of comparative optimization is: cushion cover 3 is after part screws in sleeve 4 two ends respectively in two groups, and operation afterwards can be that turnbarrel 4 can screw in interior cushion cover 3 sleeve 4 two ends internal thread segment fully, and this has simplified operating process greatly.
The utility model operating principle supplementary notes in actual applications are as follows: when two sections reinforcing bar 1 tensions, the jumping-up section is passed to packing material with two sections reinforcing bars, 1 suffered pulling force, cushion cover 3 in packing material passes to power, interior cushion cover 3 passes to outside sleeve 4 by external screw thread with power, and final sleeve 4 bears pulling force.In whole loading process, the jumping-up head bears shearing; Shearing is also born at the internal thread place of the external screw thread of interior cushion cover 3 and sleeve 4, and inner packing material is pressurized all the time, and outer sleeve also plays the effect of the inner packing material of constraint simultaneously.
Advantage of the present utility model: because outer surface is the use of the sleeve 4 of continuous structure, each of syndeton is more or less the same to the bending resistance shear behavior, and intensity is good; Required precision to connector is not high; Structures such as screw thread can be prefabricated in advance; Operations such as the jumping-up of reinforcing bar 1 end that site operation only need carry out screw fit, be easy to operate, inserts perfusion, short construction period; Combined sleeve axial length after the combination is very short, and steel using amount is few; More go for the connection of following reinforcing bar in particular cases 1: the connection that the connection of two sections reinforcing bars 1 that connection, the cross-sectional diameter of two sections reinforcing bars 1 that axis not exclusively overlaps is different, axial distance can not predetermined two sections reinforcing bars 1.
Syndeton technique effect described in the utility model is good, be much better than prior art, it has expected comparatively huge economic and social value, particularly in prefabricated assembled architectural structure system, propose to the innovation formula the very strong real solution of a kind of operability, in engineering reality, had profound significance.
Description of drawings
Below in conjunction with drawings and the embodiments the utility model is described in further detail:
Fig. 1 is for using the combined sleeve formula reinforcing steel bar connecting device structural representation of two groups of separate interior cushion covers 3;
Fig. 2 is the A-A sectional view of the Fig. 1 when cushion cover 3 is constituted by 2 branch body portions in each group;
Fig. 3 is the A-A sectional view of the Fig. 1 when cushion cover 3 in each group constitutes for the branch body portion of dividing equally substantially by 4;
Fig. 4 is the combined sleeve formula reinforcing steel bar connecting device structural representation during cushion cover 3 in one group of use; Among the figure, for being threaded, be matched in clearance between interior cushion cover 3 and the reinforcing bar 1 between interior cushion cover 3 and the sleeve 4, the end is provided with sealing mat 5;
The B-B sectional view that Fig. 5 is corresponding with Fig. 4, among Fig. 5, the external surface of sleeve 4 is a prismatic structure, is convenient to the assembling rotary manipulation;
Fig. 6 is the structural representation sketch of reinforcing bar 1 to be connected, and the linkage section of the reinforcing bar that uses in combined sleeve formula reinforcing steel bar connecting device requires the screw thread of indented bars outside is peeled off, makes its external surface approach the face of cylinder so that the installation of interior cushion cover 3 and sleeve 4;
Fig. 7 is for using two groups of separate interior cushion covers 3, and two sections be connected reinforcing bar 1 upset end external diameter unequal, two sections be connected the structural representation sketch of reinforcing bar 1 non-jumping-up section external diameter when also incomplete same;
Fig. 8 is cushion cover 3 in using 1 group, and two sections be connected reinforcing bar 1 upset end external diameter unequal, two sections be connected the structural representation sketch of reinforcing bar 1 non-jumping-up section external diameter when also incomplete same;
Fig. 9 is one of combined sleeve formula reinforcing steel bar connecting device constructing operation principle schematic; At first the sleeve 4 of outside is enclosed within one of them and is connected on the reinforcing bar 1, and outside the construction location of interior cushion cover is exposed to;
Figure 10 is two of a combined sleeve formula reinforcing steel bar connecting device constructing operation principle schematic; On the basis of Fig. 9, again the other end is connected reinforcing bar 1 and aligns, and keep its relative position attitude so that follow-up construction with before that section reinforcing bar;
Figure 11 is three of a combined sleeve formula reinforcing steel bar connecting device constructing operation principle schematic; On the basis of Figure 10, again with split type interior cushion cover 3 combine and assemble two sections reinforcing bar outsides that are connected reinforcing bar 1 jumping-up head away from combined sleeve formula reinforcing steel bar connecting device center;
Figure 12 is four of a combined sleeve formula reinforcing steel bar connecting device constructing operation principle schematic, on the basis of Figure 11, the internal thread of sleeve 4 is cooperated assembling with the external screw thread of interior cushion cover 3 and make it reach optimal assembling state afterwards;
Figure 13 is one of constructing operation principle schematic of cushion cover 3 in only using 1 group, can think next step construction of carrying out on the basis of Figure 10;
Figure 14 is next step constructions of carrying out on the basis of Figure 13 for two of the constructing operation principle schematic of cushion cover 3 in only using 1 group;
One of Figure 15 is cushion covers 3 in using two groups, and the constructing operation principle schematic when the cushion cover thread rotary orientations are opposite in two groups, can think next step construction of on the basis of Figure 10, carrying out;
Figure 16 is cushion covers 3 in using two groups, and the constructing operation principle schematic when the cushion cover thread rotary orientations are opposite in two groups two, can think next step construction of on the basis of Figure 15, carrying out;
Figure 17 is the schematic diagram that state's outer sleeve grouting formula connects, be connected reinforcing bar more than 1 in the foreign technology and adopt ribbed reinforcing bars 1, the ring on the reinforcing bar 1 and the internal thread of sleeve do not have direct occluding relation, and reinforcing bar 1 is to be retrained by the mortar between reinforcing bar 1 and the sleeve with relative slippage between the sleeve; Domestic that what use is indented bars 1 is more, and the interlock of itself and mortar does not have ribbed reinforcing bars the last 1, so the length of sleeve is often longer;
Construction simplified schematic diagram when Figure 18 is building prefabricated components reinforcing bar 1 connection of not drawing combined sleeve formula reinforcing steel bar connecting device among the figure, among the figure, after in two sections prefabricated building components to be connected each arranges by means of structure correspondences such as stem stems 7 reinforcing bar 1, at first should carry out the connection of reinforcing bar, and then carry out subsequent operations such as concrete building operations.
The specific embodiment
Each Reference numeral implication is as follows: reinforcing bar 1, interior cushion cover 3, sleeve 4, sealing mat 5, encapsulant layer 6, stem stem 7.
A kind of combined sleeve formula reinforcing steel bar connecting device (referring to accompanying drawing 1,2) is arranged in the jointing place of connected reinforcing bar 1; Described combined sleeve formula reinforcing steel bar connecting device is made of interior cushion cover 3, sleeve 4, and wherein: interior cushion cover 3 is arranged between connected reinforcing bar 1 and the sleeve 4, and is fixedly connected between interior cushion cover 3 and the sleeve 4.
In the described combined sleeve formula of the present embodiment reinforcing steel bar connecting device, described interior cushion cover 3 is branch body structures, and its combination back is for having slit or seamless sleeve-like configuration part.In actual applications, split-type structural can carry out aggregate erection easily: do not need to be inserted in from the end, can form good aggregate erection relation from directly snapping together perpendicular to axis direction.
Constitute described in nearly 0 ° of the differential of the corresponding central angle of cross section of 2 ingredients of cushion cover 3.Have the slit after the combination between the two, this can also provide condition (can realize operations such as cast inserts by means of structures such as slit or the holes of offering) for operations such as follow-up grouting simultaneously under lower assembly precision requires.
Fixedly connected concrete mode is to be threaded between described interior cushion cover 3 and the sleeve 4, and this is a kind of simple and convenient also comparatively reliable fixedly connected mode.In the described combined sleeve formula reinforcing steel bar connecting device, when interior cushion cover 3 adopted two groups, the thread rotary orientation of two groups of interior cushion covers 3 was opposite.
The packing material of in by the space between the reinforcing bar 1 of sealing mat 5, sleeve 4, interior cushion cover 3 and linkage section, annotating; After filling the slit in the inner space completely, whole assembly and connected two sections reinforcing bars 1 connect into as a whole, have good tension and transverse property.
Described packing material is specially following several combination: cement mortar (effect is fine, carries out self-compaction easily and fills), grouting material (being used for the filling in big slit), cement paste.Packing material satisfies following requirement: good fluidity (self-compaction), microdilatancy characteristic, high strength.
The linkage section proximal end of described connected piece reinforcing bar 1 is provided with and the distance of the reinforcing bar 1 axis structure greater than disconnected section bar cross section radius.Present embodiment specifically is the end to be connected jumping-up with reinforcing bar 1.And the jumping-up section should have certain length requirement vertically so that guarantee its tensile strength, bending resistance etc.
The linkage section proximal end of described connected piece reinforcing bar 1 (that is jumping-up section of reinforcing bar 1 end) is that be provided with satisfies following requirement with distance reinforcing bar 1 axis greater than the structure of disconnected section bar cross section radius: the distance values of this structure and reinforcing bar 1 axis is less than half greater than the internal diameter of interior cushion cover 3 of half whiles of sleeve 4 internal diameter diameters.
In the described combined sleeve formula reinforcing steel bar connecting device, be provided with sealing mat 5 at interior cushion cover 3 and place, the slit between the reinforcing bar 1 away from combined sleeve formula reinforcing steel bar connecting device center; So that guarantee the filling effect of inner inserts.
Use the scene of the described combined sleeve formula of present embodiment reinforcing steel bar connecting device to do process please successively referring to accompanying drawing 9,10,15,16.
Advantage in the present embodiment: because outer surface is the use of the sleeve 4 of continuous structure, each of syndeton is more or less the same to the bending resistance shear behavior, and intensity is good.Structures such as screw thread can be prefabricated in advance, and site operation only need carry out operations such as screw fit, and is simple to operation, short construction period; The syndeton technique effect is good, is much better than prior art.It has expected comparatively huge economic and social value.
Embodiment 2
Present embodiment and embodiment 1 content are basic identical, and its difference mainly is:
1) cushion cover 3 all is the branch body structure that is constituted by 4 parts in described each group, and the line of demarcation between 4 parts all is parallel to inner axis direction, and various piece is the part that the corresponding central angle of cross section is about 88 ° ring-type; This requirement is in order to guarantee carrying out smoothly of outside combination.
2) difference of the corresponding central angle of cross section of totally 4 ingredients of the described interior cushion cover 3 of formation waits greatly substantially less than 3 °.
3) fixedly connected concrete mode is to be threaded between described interior cushion cover 3 and the sleeve 4, but the thread rotary orientation of cushion covers 3 is identical in two groups.
4) use the scene of the described combined sleeve formula of present embodiment reinforcing steel bar connecting device to do process please successively referring to accompanying drawing 9,10,11,12.
5) described packing material is specially following one of several: cement mortar (effect is fine, carries out self-compaction easily and fills), grouting material (being used for the filling in big slit), cement paste (also can meet the demands).
Present embodiment and embodiment 1 content are basic identical, and its difference mainly is:
1) only uses one group of interior cushion cover in the whole combined sleeve formula reinforcing steel bar connecting device, referring to accompanying drawing 4,5,6; Cushion cover 3 all is the branch body structure that is constituted by 2 parts in described each group;
2) use the scene of the described combined sleeve formula of present embodiment reinforcing steel bar connecting device to do process please successively referring to accompanying drawing 9,10,13,14.
3) described packing material is specially following one of several: cement mortar (effect is fine, carries out self-compaction easily and fills), grouting material (being used for the filling in big slit), cement paste (also can meet the demands).
4) in the present embodiment, when externally applying drag load, interior cushion cover 3 and sleeve 4 common tensions, force-bearing situation is good.
Present embodiment and embodiment 1 or 3 contents are basic identical, and its difference mainly is:
1) external diameter of the external diameter of connected two sections reinforcing bar 1 jumping-ups part and non-jumping-up part is all incomplete same, there are differences (shown in accompanying drawing 7,8); In the adjustment use is corresponding with it, can reach better technical effect after the cushion cover 3.
2) cushion cover 3 all is the branch body structure that is constituted by 8 parts in described each group.
Present embodiment and embodiment 1 or 3 contents are basic identical, and its difference mainly is:
The linkage section proximal end of described connected piece reinforcing bar 1 is provided with and the distance of the reinforcing bar 1 axis structure greater than disconnected section bar cross section radius.Concrete operations are not jumping-up, as long as local giving prominence to can be played effect.
Claims (9)
1. combined sleeve formula reinforcing steel bar connecting device is arranged in the jointing place of connected reinforcing bar (1); It is characterized in that: described combined sleeve formula reinforcing steel bar connecting device is made of interior cushion cover (3), sleeve (4), wherein:
Interior cushion cover (3) is arranged between connected reinforcing bar (1) and the sleeve (4), and is fixedly connected between interior cushion cover (3) and the sleeve (4).
2. according to the described combined sleeve formula of claim 1 reinforcing steel bar connecting device, it is characterized in that: cushion cover (3) is the branch body structure in described, and its combination back is for having slit or seamless sleeve-like configuration part.
3. according to the described combined sleeve formula of claim 2 reinforcing steel bar connecting device, it is characterized in that: cushion cover (3) is the branch body structure that is constituted by 2～8 parts in described, line of demarcation between the various piece all is parallel to inner axis direction, and various piece is the part of the corresponding central angle of cross section smaller or equal to 180 ° ring-type;
When cushion cover (3) was the branch body structure that is constituted by 2 parts in described, the difference of the corresponding central angle of the cross section of 2 parts was smaller or equal to 10 °.
4. according to the described combined sleeve formula of claim 3 reinforcing steel bar connecting device, it is characterized in that: cushion cover (3) has 1 or 2 group in described, and each group inside is the branch body structure that is made of two parts at least; When interior cushion cover (3) was 2 groups, the proximal end of two groups of respectively corresponding connected two sections reinforcing bars (1) was arranged;
Fixedly connected concrete mode is to be threaded between described interior cushion cover (3) and the sleeve (4).
5. according to the described combined sleeve formula of claim 4 reinforcing steel bar connecting device, it is characterized in that:
Filling packing material in by the space between the reinforcing bar (1) of sealing mat (5), sleeve (4), interior cushion cover (3) and linkage section;
6. according to one of them described combined sleeve formula reinforcing steel bar connecting device of claim 1～5, it is characterized in that: the linkage section proximal end of described connected piece reinforcing bar (1) is provided with and the distance of reinforcing bar (1) the axis structure greater than disconnected section bar cross section radius.
7. according to the described combined sleeve formula of claim 6 reinforcing steel bar connecting device, it is characterized in that: the linkage section proximal end of described connected piece reinforcing bar (1) is that be provided with satisfies following requirement with distance reinforcing bar (1) axis greater than the structure of disconnected section bar cross section radius:
The distance values of this structure and reinforcing bar (1) axis less than half of sleeve (4) internal diameter diameter simultaneously greater than half of the internal diameter of interior cushion cover (3).
8. according to the described combined sleeve formula of claim 7 reinforcing steel bar connecting device, it is characterized in that: in the described combined sleeve formula reinforcing steel bar connecting device, be provided with sealing mat (5) at interior cushion cover (3) and place, the slit between the reinforcing bar (1) away from combined sleeve formula reinforcing steel bar connecting device center.
9. according to the described combined sleeve formula of claim 4 reinforcing steel bar connecting device, it is characterized in that: in the described combined sleeve formula reinforcing steel bar connecting device, when interior cushion cover (3) adopted two groups, the thread rotary orientation of two groups of interior cushion covers (3) was opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205784243U CN201991142U (en) | 2010-10-27 | 2010-10-27 | Composite sleeve type rebar connecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205784243U CN201991142U (en) | 2010-10-27 | 2010-10-27 | Composite sleeve type rebar connecting device |
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| Publication Number | Publication Date |
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| CN201991142U true CN201991142U (en) | 2011-09-28 |
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| CN2010205784243U Expired - Fee Related CN201991142U (en) | 2010-10-27 | 2010-10-27 | Composite sleeve type rebar connecting device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051964A (en) * | 2010-10-27 | 2011-05-11 | 管乃彦 | Composite sleeve type steel bar connecting device |
| CN103216044A (en) * | 2012-01-20 | 2013-07-24 | 中冶建筑研究总院有限公司 | Moisture permeation and water proofing Cement grouting steel bar connecting structure of precast concrete unit |
| CN104975652A (en) * | 2015-06-30 | 2015-10-14 | 中国矿业大学 | Butt joint connecting structure of precast concrete components |
| CN108824705A (en) * | 2018-06-25 | 2018-11-16 | 江北建设有限公司 | A kind of novel building column reinforcing steel bar connecting device |
| CN110714579A (en) * | 2018-07-11 | 2020-01-21 | 河南红桥锚机有限公司 | Prestressed tendon extension anchoring structure |
-
2010
- 2010-10-27 CN CN2010205784243U patent/CN201991142U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051964A (en) * | 2010-10-27 | 2011-05-11 | 管乃彦 | Composite sleeve type steel bar connecting device |
| CN103216044A (en) * | 2012-01-20 | 2013-07-24 | 中冶建筑研究总院有限公司 | Moisture permeation and water proofing Cement grouting steel bar connecting structure of precast concrete unit |
| CN103216044B (en) * | 2012-01-20 | 2016-01-20 | 中冶建筑研究总院有限公司 | The cement grouting steel bar connecting structure of precast unit |
| CN104975652A (en) * | 2015-06-30 | 2015-10-14 | 中国矿业大学 | Butt joint connecting structure of precast concrete components |
| CN108824705A (en) * | 2018-06-25 | 2018-11-16 | 江北建设有限公司 | A kind of novel building column reinforcing steel bar connecting device |
| CN110714579A (en) * | 2018-07-11 | 2020-01-21 | 河南红桥锚机有限公司 | Prestressed tendon extension anchoring structure |
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Granted publication date: 20110928 Termination date: 20131027 |