CN111441536B - Mortise and tenon assembled semi-hollowed grouting sleeve and connecting method thereof - Google Patents
Mortise and tenon assembled semi-hollowed grouting sleeve and connecting method thereof Download PDFInfo
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- CN111441536B CN111441536B CN202010217002.1A CN202010217002A CN111441536B CN 111441536 B CN111441536 B CN 111441536B CN 202010217002 A CN202010217002 A CN 202010217002A CN 111441536 B CN111441536 B CN 111441536B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 44
- 239000010959 steel Substances 0.000 claims description 44
- 239000004567 concrete Substances 0.000 claims description 33
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 20
- 239000011440 grout Substances 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 7
- 230000015271 coagulation Effects 0.000 claims description 6
- 238000005345 coagulation Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 12
- 238000009776 industrial production Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a mortise and tenon assembled semi-hollowed grouting sleeve and a connecting method thereof, wherein the sleeve comprises a hollow tenon connecting pipe, a hollow mortise and tenon connecting pipe and a fixing bolt; the hollow tenon connecting pipe comprises a half hollow pipe body I, tenons and a slurry outlet connecting part; the tenon comprises a large U-shaped tenon and a small U-shaped tenon which are coaxially arranged in parallel; the hollow mortise head connecting pipe comprises a half hollow pipe body II, a mortise head and a grouting connecting part; the mortise head comprises a large U-shaped groove and a small U-shaped groove which are coaxially arranged in parallel, the large U-shaped groove and the large U-shaped tenons are in mortise-tenon fit, and the small U-shaped groove and the small U-shaped tenons are in mortise-tenon fit; the outer wall surfaces of the first half hollow pipe body and the second half hollow pipe body are provided with a plurality of half hollow grooves. The invention adopts the fixing bolt to connect the small U-shaped groove and the small U-shaped tenon in a threaded manner while forming mortise-tenon connection, thereby having the characteristics of reliable connection, simple construction, easy industrial production and the like, and having good application prospect and application value.
Description
Technical Field
The invention relates to a grouting sleeve, in particular to a mortise and tenon assembled semi-hollowed grouting sleeve and a connecting method thereof.
Background
In recent years, the government of China promotes the innovation of industrial structures, and the aim of greatly developing the fabricated building is clearly proposed. The assembled building has the advantages of short building period, high construction efficiency, low enterprise cost, energy conservation, environmental protection and the like, and has wide development prospect. In fabricated buildings, the quality of the connection of the components is an important factor affecting the safety of the building. In particular, the vertical steel bars in the concrete member are mostly connected by adopting grouting sleeve, after the ribbed steel bars are inserted into the sleeve, special grouting material is used for filling gaps between the sleeve and the steel bars, and the steel bars in the sleeve are anchored by using bonding generated by hardening of the grouting material, so that the connection mode of effective force transmission between the steel bars and the sleeve is realized, and the construction operation of the connection mode is divided into cabin sealing, preparation and inspection of grouting material and grouting. This conventional approach has the following problems:
1) The quality of the grouting material is difficult to ensure. Because conditions such as labor, hardware, formula and the like of a construction site are difficult to reach the laboratory level, the fluidity, the compactness, the compressive strength, the expansion capacity and the like of the grouting material prepared in the present site cannot be ensured by 100%, and the quality of sleeve connection is further affected.
2) The construction quality of grouting is difficult to control. When grouting operation is carried out, the sleeve is completely embedded in the concrete member, and whether grouting materials in the sleeve can fill gaps in the sleeve, whether the grouting materials are uniformly distributed, whether bubbles and hollows exist or not are difficult to control, so that whether the steel bar connection in the sleeve is effective and reliable is difficult to ensure.
3) The grouting effect and the bonding quality are not easy to detect. Because the whole grouting process of the traditional grouting sleeve connecting piece is completely carried out in the sealed embedded sleeve, a constructor is difficult to detect the grouting condition inside the sleeve after grouting is finished, and whether the grouting sleeve connecting quality is qualified cannot be directly judged.
4) The adhesion between the sleeve and the external concrete is poor. The outer surface of the traditional sleeve is smooth, which affects the bonding performance between the sleeve and the concrete outside the sleeve, and the phenomenon of bonding-sliding is easy to generate in the stress process.
5) Other uncontrollable factors of the slurry anchor connection are also more. The reliability of the traditional grouting sleeve connection is also subject to the conditions that the steel bar joint is misplaced, the steel bar contacts the sleeve wall or is too close to the sleeve wall, impurities exist in the sleeve, and the like, so that the connection reliability is difficult to ensure.
To solve the above problems, some scholars have invented some new grouting sleeves:
For promoting the bonding performance between grouting material and reinforcing bar, the sleeve, a full grout sleeve that patent CN207812840U discloses has promoted the inside roughness of sleeve through setting up reinforcing bar spacing piece, reinforcing bar guider and ring segment strutting arrangement on the inner wall.
In order to solve the problem of dislocation possibly occurring at the end of a steel bar, a split grouting sleeve disclosed in a patent CN109184084A is provided with a cylindrical cavity in the middle of a left sleeve section and a right sleeve section, and an annular limiting device is arranged in the cavity. The two spherical joints are clamped between the inner holes of the two annular limiting pieces, and the left half grouting sleeve and the right half grouting sleeve are respectively fastened and positioned through two groups of fastening bolts. So that the steel bar ends can still be connected under the condition of certain dislocation. However, the above-mentioned two kinds of sleeves add the component between sleeve inner wall and reinforcing bar, have further reduced the sleeve and have just very narrow and small space between reinforcing bar, have influenced the mobility of grouting material, and the ball joint that patent CN109184084A proposed is comparatively complicated simultaneously, has increased sleeve manufacturing cost.
In addition, the patent CN205742753U discloses a combined grouting sleeve, which is divided into an upper part, a middle part and a lower part with internal threads or external threads, and is connected by adopting a mode of rotating a middle sleeve, and the friction resistance between the inner wall of the sleeve and grouting materials is increased by utilizing the threads and the protrusions of the inner wall of the middle friction assembly. However, the above combined sleeve connection technology has very high requirements on the manufacturing and construction of the middle sleeve, mainly reflected in that the middle sleeve needs to be connected with the upper sleeve and the lower sleeve simultaneously through threaded connection, and the difficulty in realizing accurate connection is very high and the manufacturing requirement on the sleeve is very high under the condition that the upper sleeve and the lower sleeve and the prefabricated component thereof are inconvenient to move; more importantly, for the vertical reinforced concrete member which needs to connect a plurality of or a plurality of rows of steel bars simultaneously, the screw connection is adopted simultaneously, the vertical displacement is ensured to be basically consistent, the construction difficulty is extremely high, and the implementation of the patent is influenced.
Therefore, it is necessary to provide a sleeve connection member which is easy to operate and has high safety, and which is more reliable in connection, especially in terms of sleeve connection.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a mortise-tenon assembled semi-hollow grouting sleeve and a connecting method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
a mortise and tenon assembled semi-hollowed grouting sleeve comprises a hollow tenon connecting pipe, a hollow mortise and tenon connecting pipe and a fixing bolt.
The hollow tenon connecting pipe and the hollow mortise head connecting pipe are respectively provided with a through cavity which is axially communicated, and the through cavity can be used for inserting reinforcing steel bars to be connected and injecting grouting materials.
The hollow tenon connecting pipe comprises a half hollow pipe body I, tenons positioned at two ends of the half hollow pipe body I and a slurry outlet connecting part.
The grout outlet connecting part is provided with a grout outlet hole. The tenon comprises a large U-shaped tenon and a small U-shaped tenon which are coaxially arranged in parallel, wherein the small U-shaped tenon is positioned between the large U-shaped tenon and the semi-hollowed-out tube body I.
The hollow core mortise head connecting pipe comprises a half hollow pipe body II and mortise heads and grouting connecting parts positioned at two ends of the half hollow pipe body II.
The grouting connecting part is provided with grouting holes. The mortise head comprises a large U-shaped groove and a small U-shaped groove which are coaxially arranged in parallel, wherein the large U-shaped groove is positioned between the small U-shaped groove and the semi-hollow pipe body II. Simultaneously, big U type groove and big U type tenon realize mortise and tenon cooperation, and little U type groove and little U type tenon realize mortise and tenon cooperation.
A plurality of semi-hollowed grooves are formed in the outer wall surfaces of the first semi-hollowed pipe body and the second semi-hollowed pipe body.
The fixing bolt is used for connecting the small U-shaped groove with the small U-shaped tenons in a mortise-tenon mode and achieving threaded connection.
The large U-shaped tenons sequentially comprise a large outer cambered surface, a large inclined shoulder, a large vertical side wall surface and a large inner cambered surface from top to bottom. The small U-shaped tenons sequentially comprise a small outer cambered surface, a small inclined shoulder, a small vertical side wall surface and a small inner cambered surface from top to bottom. The large outer cambered surface and the small outer cambered surface are flush with the outer wall surface of the first half hollow pipe body, and the arc length of the large outer cambered surface is larger than that of the small outer cambered surface. A large circular cavity is arranged in the large U-shaped tenon. A small circular cavity is arranged in the small U-shaped tenons. The large circular cavity and the small circular cavity are both coaxially arranged with the through cavity of the semi-hollow pipe body I, and the diameter of the through cavity is larger than the diameter D5 of the large circular cavity, and the diameter of the steel bar to be connected is larger than or equal to the diameter of the small circular cavity.
The large vertical side wall surface is tangent with the large intrados, the small vertical side wall surface is tangent with the small intrados, the large intrados diameter is assumed to be D3, the small intrados diameter is assumed to be D4, the small U-shaped groove width is assumed to be D1, the large U-shaped groove width is assumed to be D2, d1=d4, d2=d3, and D3 > D5 > D4.
The small vertical side wall surface in the small U-shaped tenons is provided with an internal threaded hole, the corresponding position of the small U-shaped grooves is provided with an external threaded hole, and the external wall surface of the small U-shaped grooves corresponding to the positions of the external threaded holes is provided with a threaded pad. After the fixing bolts penetrate through the threaded pad table, the external threaded holes and the internal threaded holes, the threaded connection of the small U-shaped grooves and the small U-shaped tenons is realized.
Convex parts between two adjacent semi-hollowed grooves on the outer wall surfaces of the first semi-hollowed pipe body and the second semi-hollowed pipe body are respectively provided with convex-concave stripes.
Four grouting holes are distributed in the grouting connecting portion along the circumferential direction, and four grouting holes are distributed in the grouting connecting portion along the circumferential direction. Each grouting hole and each grouting hole can be sealed and plugged by a metal plug.
A connection method of a mortise and tenon assembled semi-hollowed grouting sleeve comprises the following steps.
Step 1, inserting a reinforcing steel bar to be connected into a sleeve, comprising the following steps:
Step 11, inserting a hollow tenon connecting pipe into the steel bar to be connected: sleeving a hollow tenon connecting pipe at the end part of each reinforcing steel bar to be connected in the mixed block I, wherein the concrete sleeving method comprises the following steps: and the end part of the first steel bar to be connected stretches into the through cavity in the hollow tenon connecting pipe from the slurry outlet connecting part side. The insertion depth is required to be larger than 10 times of the diameter of the steel bars to be connected, and each grout outlet hole of the grout outlet connecting part is plugged by a metal plug.
Step 12, inserting a second reinforcing steel bar to be connected into the hollow mortise head connecting pipe: sleeving a hollow mortise head connecting pipe at the end part of each reinforcing steel bar to be connected in the mixed block II, wherein the concrete sleeving method comprises the following steps: and (3) extending the end part of the second steel bar to be connected into the through cavity in the hollow mortise head connecting pipe from the grouting connecting part side. The insertion depth is required to be larger than 10 times of the diameter of the steel bars to be connected, and each grouting hole of the grouting connecting part is plugged by a metal plug.
Step 2, embedding a sleeve, comprising the following steps:
step 21, embedding a hollow tenon connecting pipe: the hollow tenon connecting pipes sleeved on the periphery of the connecting steel bar are embedded in the edge parts of the first concrete block except for tenons, and at least one slurry outlet hole in each hollow tenon connecting pipe is exposed.
Step 22, embedding a hollow mortise head connecting pipe: the hollow mortise head connecting pipes sleeved on the periphery of the connecting steel bars are embedded at the edge parts of the second concrete block except the mortise heads, and at least one grouting hole in each hollow mortise head connecting pipe is exposed.
Step 3, connecting the sleeve: and hoisting the first concrete block to ensure that the tenon of the hollow core tenon connecting pipe in the first concrete block is meshed with the mortise of the hollow core mortise connecting pipe in the second concrete block, and after mortise and tenon connection is completed, realizing threaded secondary connection by using the small U-shaped groove in the mortise and the small U-shaped tenon in the tenon through the fixing bolt.
Step 4, grouting: and removing the exposed one of the grouting holes and the metal plugs in the grouting holes, grouting from the grouting holes until the slurry flows out of the grouting holes, and sealing the grouting holes and the grouting holes.
Step 5, gap filling: filling mortar, sealing interface gaps at the joints of the tenons and the mortise heads, and curing after the surface concrete is leveled.
In step 21, the outer wall surface of the hollow tenon connecting pipe is contacted with the first coagulation block through the semi-hollowed-out grooves and the convex-concave stripes. In step 22, the outer wall surface of the hollow mortise head connecting pipe is contacted with the two phases of the coagulation block through the semi-hollowed grooves and the convex-concave stripes.
In step 3, the biting force F t between the tenon and the mortise head is:
Wherein D is the outer diameter of the sleeve, D1 is the width of the small U-shaped groove, D2 is the width of the U-shaped groove, and f t is the tensile strength of the sleeve material.
In step 3, the pin force F s provided by the single fixing bolt and the shear bearing capacity of the single fixing boltThe following formula is satisfied:
and/>
T＝fyAs
Wherein mu is the bolt extrusion friction coefficient, and is generally less than 1.0; The forward extrusion force shear bearing capacity of a single fixing bolt; n v is the number of sheared faces of the fixing bolt, d is the diameter of the fixing bolt, and/ > The shear strength of the fixing bolt is; t is the tensile force exerted by the steel bars to be connected; f y is the yield strength of the steel bars to be connected; a s is the cross-sectional area of the rebar to be connected.
The invention has the following beneficial effects:
1. The semi-hollow groove in the sleeve is arranged, so that the steel consumption can be reduced, and the production cost can be reduced; on the other hand, the roughness of the sleeve surface is improved, so that the bonding performance between the sleeve and the concrete is improved.
2. According to the invention, the hollow core tenon connecting pipe and the hollow core connecting pipe are connected through the tenons and the mortise heads at first, and then the mortise and tenon joints are subjected to secondary threaded fixation through the fixing bolts, so that the rotation of the sleeve in all directions can be effectively limited, the reliability and the firmness of the connection of the reinforcing steel bars are greatly improved, and the defect that the grouting quality of the traditional grouting sleeve is difficult to control and detect is avoided.
3. At present, the traditional sleeve connecting force is mainly the slurry anchoring effect of grouting materials, and in the invention, the sleeve connecting force consists of the cementing force of grouting materials, the friction force between the sleeve and concrete, the bolt force provided by a fixing bolt and the mechanical biting force of a mortise and tenon joint. Obviously, the invention provides more connection modes between the sleeves, can effectively improve the connection performance of the reinforcing steel bars, and can furthest reduce the connection problems under the condition of not influencing the grouting quality by adopting a mixed connection mode, so that the structure is safer and more reliable.
4. The mortise and tenon connection and the bolt connection are constructed and connected under the exposed condition, so that the construction quality control and the connection reliability detection are convenient; and after the external connection is completed, grouting connection is performed, and the multiple connection measures are more reliable compared with the traditional grouting sleeve technology.
5. The tenon and the mortise head are tightly meshed, so that extra slurry leakage phenomenon can be avoided, cost loss caused by slurry waste is reduced, construction operation is simple, and certain economic benefit is achieved.
Drawings
Fig. 1 shows a schematic structural view of a mortise and tenon assembled semi-hollow grouting sleeve.
Fig. 2 shows an enlarged detail view of the head of the hollow core head connecting pipe according to the present invention.
Fig. 3 shows a longitudinal section of the mortise head according to the present invention.
Fig. 4 shows an enlarged detail view of the tenon in the hollow core tenon joint pipe of the present invention.
Figure 5 shows a longitudinal section of the tenon according to the invention.
Fig. 6 shows a connection state diagram of the hollow core tenon connecting pipe and the hollow core mortise head connecting pipe.
FIG. 7 is a longitudinal sectional view showing the connection of the hollow core tenon connecting pipe and the hollow core mortise head connecting pipe.
FIG. 8 shows an installation view of the hollow core tenon connecting pipe and the hollow core mortise head connecting pipe before construction.
FIG. 9 shows a construction process diagram of the hollow core tenon connecting pipe and the hollow core mortise head connecting pipe.
Fig. 10 is a schematic diagram showing a state after the construction of the mortise and tenon assembled semi-hollowed grouting sleeve is completed.
The method comprises the following steps:
10. hollow tenon connecting pipe;
11. a first half hollow pipe body; 111. semi-hollowed grooves;
12. A tenon;
121. large U-shaped tenons; 1211. a large extrados; 1212. large inclined shoulder-building; 1213. large vertical sidewall surfaces; 1214. a large intrados surface; 1215. a large circular cavity;
122. Small U-shaped tenons; 1221. a small extrados; 1222. small inclined shoulder-straps; 1223. small vertical sidewall surfaces; 1224. a small intrados surface; 1225. a small circular cavity; 1226. an internal threaded hole;
13. A slurry outlet connecting part; 131. a pulp outlet hole;
20. hollow mortise head connecting pipe;
21. a second half hollow pipe body;
22. Mortise head; 221. a large U-shaped groove; 222. a small U-shaped groove; 2221. an external threaded hole; 2222. a threaded pad;
23. Grouting connecting parts; 231. grouting holes;
30. a fixing bolt; 40. reinforcing steel bars to be connected; 50. grouting.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present invention. The specific dimensions adopted in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
As shown in fig. 1, 6 and 7, a mortise-tenon assembled semi-hollow grouting sleeve comprises a hollow tenon connecting pipe 10, a hollow mortise head connecting pipe 20 and a fixing bolt 30.
The hollow mortise connecting pipe and the hollow mortise connecting pipe are provided with through cavities which are axially penetrated and can be used for inserting the reinforcing steel bars 40 to be connected and injecting grouting material 50.
The hollow tenon connecting pipe comprises a half hollow pipe body 11, tenons 12 positioned at two ends of the half hollow pipe body and a slurry outlet connecting part 13.
The outer wall surface of the first half hollow pipe body is provided with a plurality of half hollow grooves 111, so that the steel consumption is reduced, the production cost is reduced, and meanwhile, the bonding performance between the sleeve and the concrete can be improved.
Further, convex and concave stripes are arranged on the convex parts between two adjacent semi-hollowed grooves on the outer wall surface of the semi-hollowed pipe body, so that the bonding performance between the sleeve and the concrete is further improved.
The grout outlet connection is preferably provided with four grout outlet holes 131, which are preferably evenly distributed along the circumference of the grout outlet connection.
As shown in fig. 4 and 5, the tenon comprises a large U-shaped tenon 121 and a small U-shaped tenon 122 which are coaxially arranged in parallel, wherein the small U-shaped tenon is positioned between the large U-shaped tenon and the first semi-hollow tube body.
The large U-shaped tenons include, in order from top to bottom, a large outer arcuate surface 1211, a large inclined shoulder 1212, a large vertical sidewall surface 1213, and a large inner arcuate surface 1214. The large U-shaped tenons are also provided with large circular cavities 1215, the large circular cavities 1215 being part of the through cavities.
The small U-shaped tenons include, in order from top to bottom, a small extrados 1221, a small oblique shoulder 1222, a small vertical sidewall 1223, and a small intrados 1224. A small circular cavity 1225 is also provided in the small U-shaped tongue, and a large circular cavity 1215 is also part of the through cavity.
The large outer cambered surface and the small outer cambered surface are flush with the outer wall surface of the half hollow pipe body I, and the arc length of the large outer cambered surface is larger than that of the small outer cambered surface.
The large circular cavity and the small circular cavity are both coaxially arranged with the through cavity of the semi-hollow pipe body I, and the diameter of the through cavity is larger than the diameter D5 of the large circular cavity, and the diameter of the steel bar to be connected is larger than or equal to the diameter of the small circular cavity.
The large vertical side wall surface is tangent to the large intrados, the small vertical side wall surface is tangent to the small intrados, the large intrados diameter is assumed to be D3, the small intrados diameter is assumed to be D4, the small U-shaped groove width is assumed to be D1, the large U-shaped groove width is assumed to be D2, d1=d4, d2=d3, and D3 > D5 > D4.
The small vertical sidewall surface in the small U-shaped tenons is provided with an internally threaded hole 1226.
The hollow core mortise head connecting pipe comprises a half hollow pipe body II 21, and mortise heads 22 and grouting connecting parts 23 positioned at two ends of the half hollow pipe body II.
The grouting connecting part is preferably provided with four grouting holes 231 uniformly in the circumferential direction. Each grouting hole and each grouting hole can be sealed and plugged by a metal plug preferably.
As shown in fig. 2 and 3, the mortise head includes a large U-shaped groove 221 and a small U-shaped groove 222 coaxially arranged in parallel, wherein the large U-shaped groove is located between the small U-shaped groove and the second half hollow pipe body. Simultaneously, big U type groove and big U type tenon realize mortise and tenon cooperation, and little U type groove and little U type tenon realize mortise and tenon cooperation.
The small U-shaped groove is provided with an external threaded hole 2221 at the corresponding position, and a threaded pad 2222 is arranged on the outer wall surface of the small U-shaped groove corresponding to the position of the external threaded hole.
After the fixing bolt passes through the threaded pad table, the external threaded hole and the internal threaded hole, the threaded connection of the small U-shaped groove and the small U-shaped tenons is realized.
Further, a plurality of semi-hollowed grooves are formed in the outer wall surface of the second semi-hollowed tube body, and convex portions between two adjacent semi-hollowed grooves are preferably provided with convex-concave stripes.
A connection method of a mortise and tenon assembled semi-hollowed grouting sleeve comprises the following steps.
Step 1, inserting the reinforcing steel bars to be connected into the sleeve, which comprises the following steps.
Step 11, inserting a hollow tenon connecting pipe into the steel bar to be connected: sleeving a hollow tenon connecting pipe at the end part of each reinforcing steel bar to be connected in the mixed block I, wherein the concrete sleeving method comprises the following steps: and the end part of the first steel bar to be connected stretches into the through cavity in the hollow tenon connecting pipe from the slurry outlet connecting part side. The insertion depth is required to be larger than 10 times of the diameter of the steel bars to be connected, and each grout outlet hole of the grout outlet connecting part is plugged by a metal plug.
Step 12, inserting a second reinforcing steel bar to be connected into the hollow mortise head connecting pipe: sleeving a hollow mortise head connecting pipe at the end part of each reinforcing steel bar to be connected in the mixed block II, wherein the concrete sleeving method comprises the following steps: and (3) extending the end part of the second steel bar to be connected into the through cavity in the hollow mortise head connecting pipe from the grouting connecting part side. The insertion depth is required to be larger than 10 times of the diameter of the steel bars to be connected, and each grouting hole of the grouting connecting part is plugged by a metal plug.
Step 2, embedding a sleeve, comprising the following steps:
Step 21, embedding a hollow tenon connecting pipe: the hollow tenon connecting pipes sleeved on the periphery of the connecting steel bar are embedded in the edge parts of the first concrete block except for tenons, and at least one slurry outlet hole in each hollow tenon connecting pipe is exposed. The outer wall surface of the hollow tenon connecting pipe is contacted with the first coagulation block through the semi-hollowed-out grooves and the convex-concave stripes.
Step 22, embedding a hollow mortise head connecting pipe: the hollow mortise head connecting pipes sleeved on the periphery of the connecting steel bars are embedded at the edge parts of the second concrete block except the mortise heads, and at least one grouting hole in each hollow mortise head connecting pipe is exposed. The outer wall surface of the hollow mortise head connecting pipe is contacted with the two phases of the coagulation block through the semi-hollowed grooves and the convex-concave stripes.
Step 3, connecting the sleeve: and hoisting the first concrete block to ensure that the tenon of the hollow core tenon connecting pipe in the first concrete block is meshed with the mortise of the hollow core mortise connecting pipe in the second concrete block, and after mortise and tenon connection is completed, realizing threaded secondary connection by using the small U-shaped groove in the mortise and the small U-shaped tenon in the tenon through the fixing bolt.
In step 3, the biting force F t between the tenon and the mortise head is:
Ft>T
T＝fyAs
Wherein D is the outer diameter of the sleeve, D1 is the width of the small U-shaped groove, D2 is the width of the U-shaped groove, and f t is the tensile strength of the sleeve material. T is the tensile force exerted by the steel bars to be connected; f y is the yield strength of the steel bars to be connected; a s is the cross-sectional area of the rebar to be connected.
Further, the pin force F s provided by the single fixing bolt and the shearing bearing capacity of the single fixing boltThe following formula is satisfied:
and/>
Wherein mu is the bolt extrusion friction coefficient, and is generally less than 1.0; The forward extrusion force shear bearing capacity of a single fixing bolt; n v is the number of sheared faces of the fixing bolt, and in the invention, the number is 2; d is the diameter of the fixing bolt,/> The shear strength of the fixing bolt is; t is the tensile force exerted by the steel bars to be connected.
The sleeve force analysis is as follows:
The sleeve connecting force provided by the grouting sleeve mainly comprises an engagement force F t generated by engagement between mortise and tenon joints, a bolt force F s provided by bolts, a binding force F b between grouting materials and pipe walls and reinforcing steel bars and a friction resistance F μ between the sleeve and concrete, namely F 1＝Fs+Ft+Fb+Fμ.
The sleeve connecting force provided by the traditional sleeve is mainly the binding force F b generated by grouting material and the pipe wall and reinforcing steel bar, namely F 2＝Fb
Obviously, F 1＞F2, therefore, the invention can provide more connecting force, and the structure is safer and more reliable.
Step 4, grouting: and removing the exposed one of the grouting holes and the metal plugs in the grouting holes, grouting from the grouting holes until the slurry flows out of the grouting holes, and sealing the grouting holes and the grouting holes.
Step 5, gap filling: filling mortar, sealing interface gaps at the joints of the tenons and the mortise heads, and curing after the surface concrete is leveled.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (7)
1. The utility model provides a half fretwork grout sleeve of mortise and tenon assembled, its characterized in that: comprises a hollow tenon connecting pipe, a hollow mortise connecting pipe and a fixing bolt;
the hollow tenon connecting pipe and the hollow mortise head connecting pipe are provided with through cavities which are axially communicated, and the through cavities can be used for inserting reinforcing steel bars to be connected and injecting grouting materials;
The hollow tenon connecting pipe comprises a half hollow pipe body I, tenons and a slurry outlet connecting part which are positioned at two ends of the half hollow pipe body I;
The pulp outlet connecting part is provided with a pulp outlet hole; the tenon comprises a large U-shaped tenon and a small U-shaped tenon which are coaxially arranged in parallel, wherein the small U-shaped tenon is positioned between the large U-shaped tenon and the semi-hollowed tube body I;
The hollow mortise head connecting pipe comprises a half hollow pipe body II, mortise heads positioned at two ends of the half hollow pipe body II and a grouting connecting part;
the grouting connecting part is provided with grouting holes; the mortise head comprises a large U-shaped groove and a small U-shaped groove which are coaxially arranged in parallel, wherein the large U-shaped groove is positioned between the small U-shaped groove and the semi-hollow pipe body II; simultaneously, the large U-shaped groove and the large U-shaped tenons realize mortise and tenon matching, and the small U-shaped groove and the small U-shaped tenons realize mortise and tenon matching;
a plurality of semi-hollowed grooves are formed in the outer wall surfaces of the first semi-hollowed pipe body and the second semi-hollowed pipe body;
The fixing bolt is used for connecting the small U-shaped groove with the small U-shaped tenons in a mortise-tenon mode and realizing threaded connection;
The large U-shaped tenons sequentially comprise a large outer cambered surface, a large inclined shoulder, a large vertical side wall surface and a large inner cambered surface from top to bottom; the small U-shaped tenons sequentially comprise a small outer cambered surface, a small inclined shoulder, a small vertical side wall surface and a small inner cambered surface from top to bottom; the large outer cambered surface and the small outer cambered surface are flush with the outer wall surface of the first half hollow pipe body, and the arc length of the large outer cambered surface is longer than that of the small outer cambered surface; a large circular cavity is arranged in the large U-shaped tenon; a small circular cavity is arranged in the small U-shaped tenons; the large circular cavity and the small circular cavity are coaxially arranged with a through cavity of the semi-hollow pipe body I, and the diameter of the through cavity is larger than the diameter D5 of the large circular cavity, and the diameter of the steel bar to be connected is larger than or equal to the diameter of the small circular cavity;
The large vertical side wall surface is tangent to the large intrados, the small vertical side wall surface is tangent to the small intrados, the diameter of the large intrados is assumed to be D3, the diameter of the small intrados is assumed to be D4, the width of the small U-shaped groove is assumed to be D1, and the width of the large U-shaped groove is assumed to be
D2, d1=d4, d2=d3, D3 > D5 > D4;
the small vertical side wall surface in the small U-shaped tenons is provided with an internal threaded hole, the corresponding position of the small U-shaped grooves is provided with an external threaded hole, and the external wall surface of the small U-shaped grooves corresponding to the position of the external threaded hole is provided with a threaded pad; after the fixing bolts penetrate through the threaded pad table, the external threaded holes and the internal threaded holes, the threaded connection of the small U-shaped grooves and the small U-shaped tenons is realized.
2. The mortise and tenon assembled semi-hollowed grouting sleeve according to claim 1, wherein: convex parts between two adjacent semi-hollowed grooves on the outer wall surfaces of the first semi-hollowed pipe body and the second semi-hollowed pipe body are respectively provided with convex-concave stripes.
3. The mortise and tenon assembled semi-hollowed grouting sleeve according to claim 1, wherein: four grouting holes are distributed in the grouting connecting part along the circumferential direction, and four grouting holes are uniformly distributed in the grouting connecting part along the circumferential direction; each grouting hole and each grouting hole can be sealed and plugged by a metal plug.
4. A method for connecting a semi-hollow grouting sleeve based on the mortise and tenon assembly of any one of claims 1-3, which is characterized by comprising the following steps: the method comprises the following steps:
Step 1, inserting a reinforcing steel bar to be connected into a sleeve, comprising the following steps:
Step 11, inserting a hollow tenon connecting pipe into the steel bar to be connected: sleeving a hollow tenon connecting pipe at the end part of each reinforcing steel bar to be connected in the mixed block I, wherein the concrete sleeving method comprises the following steps: extending the end part of the first steel bar to be connected into a through cavity in the hollow tenon connecting pipe from the slurry outlet connecting part side; the insertion depth is required to be larger than 10 times of the diameter of the steel bars to be connected, and each grout outlet hole of the grout outlet connecting part is plugged by a metal plug;
Step 12, inserting a second reinforcing steel bar to be connected into the hollow mortise head connecting pipe: sleeving a hollow mortise head connecting pipe at the end part of each reinforcing steel bar to be connected in the mixed block II, wherein the concrete sleeving method comprises the following steps: extending the end part of the second steel bar to be connected into the through cavity in the hollow mortise head connecting pipe from the grouting connecting part side; the insertion depth is required to be more than 10 times of the diameter of the steel bars to be connected, and each grouting hole of the grouting connecting part is plugged by a metal plug;
step 2, embedding a sleeve, comprising the following steps:
Step 21, embedding a hollow tenon connecting pipe: the hollow tenon connecting pipes sleeved on the periphery of the connecting steel bar are embedded in the edge part of the first concrete block except for tenons, and at least one slurry outlet hole in each hollow tenon connecting pipe is exposed;
step 22, embedding a hollow mortise head connecting pipe: the hollow mortise head connecting pipes sleeved on the periphery of the connecting steel bars are embedded in the edge parts of the second concrete block except the mortise heads, and at least one grouting hole in each hollow mortise head connecting pipe is exposed;
Step 3, connecting the sleeve: hoisting a concrete block I, enabling a tenon of a hollow core tenon connecting pipe in the concrete block I and a mortise of a hollow core mortise connecting pipe in the concrete block II to be meshed with each other, and after mortise and tenon connection is completed, using a fixing bolt to realize threaded secondary connection of a small U-shaped groove in the mortise and a small U-shaped tenon in the tenon;
Step 4, grouting: removing the exposed one of the grouting holes and the metal plugs in the grouting holes, grouting from the grouting holes until the slurry flows out of the grouting holes, and sealing the grouting holes and the grouting holes;
Step 5, gap filling: filling mortar, sealing interface gaps at the joints of the tenons and the mortise heads, and curing after the surface concrete is leveled.
5. The method for connecting the mortise and tenon assembled semi-hollowed grouting sleeve according to claim 4, wherein the method comprises the following steps of: in the step 21, the outer wall surface of the hollow tenon connecting pipe is contacted with the first coagulation block through the semi-hollowed-out grooves and the convex-concave stripes; in step 22, the outer wall surface of the hollow mortise head connecting pipe is contacted with the two phases of the coagulation block through the semi-hollowed grooves and the convex-concave stripes.
6. The method for connecting the mortise and tenon assembled semi-hollowed grouting sleeve according to claim 5, wherein the method comprises the following steps of: in step 3, the biting force F t between the tenon and the mortise head is:
Wherein D is the outer diameter of the sleeve, D1 is the width of the small U-shaped groove, D2 is the width of the U-shaped groove, and f t is the tensile strength of the sleeve material.
7. The method for connecting the mortise and tenon assembled semi-hollowed grouting sleeve according to claim 5, wherein the method comprises the following steps of: in step 3, the pin force F s provided by the single fixing bolt and the shear bearing capacity of the single fixing boltThe following formula is satisfied:
and/>
T＝fyAs
Wherein mu is the bolt extrusion friction coefficient, and is generally less than 1.0; The forward extrusion force shear bearing capacity of a single fixing bolt; n v is the number of sheared faces of the fixing bolt, d is the diameter of the fixing bolt, and/ > The shear strength of the fixing bolt is; t is the tensile force exerted by the steel bars to be connected; f y is the yield strength of the steel bars to be connected; a s is the cross-sectional area of the rebar to be connected.
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| JP4339963B2 (en) * | 1999-07-09 | 2009-10-07 | 日本スプライススリーブ株式会社 | Mortar filling type rebar joint |
| DE60200118T2 (en) * | 2001-02-21 | 2004-05-27 | Erico International Corp., Solon | Rebar connection and connection method |
| US8402717B1 (en) * | 2009-07-06 | 2013-03-26 | Lawrence Girard Randazzo | Wood hybrid light pole |
| CN107387141B (en) * | 2017-09-12 | 2020-05-19 | 中国矿业大学 | Self-drilling type differential grouting combined anchor rod and anchoring method thereof |
| CN107700756A (en) * | 2017-09-30 | 2018-02-16 | 合肥建工集团有限公司 | A kind of assembly of shear wall structure exterior wall reinforcing bar is partly in the milk attachment means |
| CN108930360A (en) * | 2018-04-29 | 2018-12-04 | 山东德建集团有限公司 | Exposed inversion reinforcing bar grout sleeve precast concrete column and construction method |
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