Background technology
In the prior art that building reinforced concrete is built, two reinforcing bars are connected one mainly contain following several kinds of modes: the mutual welding of reinforcing bar, sleeve pipe press joining method, crooked binding method.The construction of above-mentioned several kinds of connected modes is comparatively complicated, and must before concreting, accomplish the reinforcing bar connection, is not suitable for the assembling construction of precast concrete.And in the construction of prefabricated reinforced concrete structure, adopt a kind of reinforcing steel bar connecting sleeve tube to connect usually.This connected mode principle is roughly following: see through the hollow type reinforcing steel bar connecting sleeve tube of casting, reinforcing bar penetrates sleeve inner from both ends open, need not overlap or fuse, and between reinforcing bar and sleeve, fills the structural mortar of high strength microdilatancy, promptly accomplishes the steel bar joining action.The mechanism of its connection mainly receives the Shu Zuoyong that encloses of sleeve with mortar; Add and itself have the microdilatancy characteristic; Positive acting power between enhancing and reinforcing bar, sleeve inboard by this, reinforcing bar promptly by the frictional force of this positive force and rough surface generation, transmits reinforcement stresses.Grout sleeve syndeton bonding strength is good, and easy to operate, in the prefabricated reinforced concrete structure, is used widely.
But in the above-mentioned sleeve connected mode; Usually adopt the mode that is positioned at the top of overfolw hole in the grout hole; Grouting is from the grout hole of its sidewall, to pour into the structural mortar of high strength microdilatancy, the slit that filled with mortar tube wall and reinforcing bar form, and under the effect of gravity, flow out from overfolw hole.Generally can not poured into slurries so be positioned at the grout hole superjacent air space in the sleeve cavity, reduced bonding strength.And in filling process, between the formed slit of tube wall and reinforcing bar, especially have certain proportion in the gap of two steel bar ends and hole occurs, cause the bonding strength of reinforcing bar to reduce.And when prefabricated building components was installed, whether the reinforced bar sleeve after grouting is accomplished did not have plant and instrument can nondestructive testing qualified, and not with the method for its dismounting.In case resident air and then hole occurs in the slip casting will cause building potential safety hazard to occur.Still do not have at present and a kind ofly can guarantee branch sleeve grouting qualified constructure scheme fully.Improve its qualification rate so the applicant visualizes a kind of grouting mode of pressure type, hope to carry out slip casting through big pressure, and make sleeve inner not produce hole through the branch sleeve inner chamber is constituted an airtight space.And also having hermetically-sealed construction in the tube-in-tube structure that industry is commonly seen, its purpose of design is to avoid being in the milk trickling sleeve when expecting before the slurry setting and harden.Its concrete structure is to adopt the gap between elastic rubber sealing ring sealing reinforcing bar and the sleeve at sleeve both ends open place.This kind hermetically-sealed construction is applicable to the slurry shutoff under no pressure or the minimum pressure, and is then inapplicable fully for high-pressure slip-casting.
Summary of the invention
The purpose of the utility model is the weak point according to above-mentioned prior art; A kind of branch sleeve grouting formwork seal structure is proposed; Through elastomeric pad and Sealing formboard prefabricated units and lower member are constituted a sealed whole body; Through the mode of pressure type slip casting, improved the qualification rate of grouting afterwards.
The purpose of the utility model is accomplished by following technical scheme:
A kind of branch sleeve grouting formwork seal structure; Comprise lower member with assembling reinforcing bar and the prefabricated units that are embedded with branch sleeve; Said assembling reinforcing bar is plugged in the said branch sleeve; Offer overfolw hole on the said branch sleeve sidewall and be positioned at the grout hole of overfolw hole below, it is characterized in that: said formwork seal structure also comprises Sealing formboard, connector and at least one elastomeric pad; Said elastomeric pad is coated on surface, the nearly prefabricated units of said lower member place and is coated on surface, the nearly lower member of said prefabricated units place; Said Sealing formboard is set in outside the said elastomeric pad, and through said connector said Sealing formboard, elastomeric pad is fixed on said prefabricated units and lower member.
Said prefabricated units sidewall and said lower member upper surface join and constitute L shaped structure; In the said plurality of elastic pad some are coated on said prefabricated units sidewall and the end to end closed circular that is; The residual elasticity pad is covered in said lower member upper surface and is closed circular around said prefabricated units; Said Sealing formboard shape and said prefabricated units form fit also are set with said elastomeric pad and prefabricated units; Said Sealing formboard lower end is provided with flange, reaches flange in said lower member upper surface, the said elastomeric pad and stacks successively from the bottom to top.
Said connector comprises bolt, and said bolt passes through said Sealing formboard, elastomeric pad and said prefabricated units or lower member bolt.
Said connector comprises the lock ring device, and said lock ring device is set in the Sealing formboard outside.
Said grout hole is positioned at the bottom of said branch sleeve sidewall.
The utility model has the advantages that: simple in structure, easy to use; Improved the qualification rate of branch sleeve grouting greatly.
The specific embodiment
Through embodiment the utility model characteristic and other correlated characteristic are done further explain below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Shown in Fig. 1-3, mark 1-10 is respectively among the figure: prefabricated units 1, branch sleeve 2, lower member 3, elastomeric pad 4, Sealing formboard 5, adjustment bolt 6, stirrup 7, precast reinforced 8, assembling reinforcing bar 9, flange 10.
Embodiment 1:
Referring to accompanying drawing 1, branch sleeve grouting formwork seal structure comprises lower member 3, prefabricated units 1, elastomeric pad 4 and Sealing formboard 5.Wherein:
Lower member 3 upper surfaces are raised with assembling reinforcing bar 9, and prefabricated units 1 are held on the lower member 3.Prefabricated units 1 are rectangular-shaped structure, and its four sidewalls join with lower member 3 upper surfaces respectively and constitute L shaped turning.Prefabricated units 1 inside be embedded with precast reinforced 8 with branch sleeve 2, it is precast reinforced 8 that the opening of branch sleeve 2 upper ends is fitted with, lower ending opening is fitted with assembling reinforcing bar 9.Offer grout hole and overfolw hole with its internal communication on the sidewall of branch sleeve 2, wherein overfolw hole is positioned at the top of grout hole.Especially it should be noted that owing to adopt overfolw hole to be positioned at the tube-in-tube structure of the top of grout hole here, be different from conventional mode from bottom to top and be in the milk, but adopt high pressure slip casting from lower to upper, so just need the formwork seal structure to seal.
After branch sleeve 2 inside pour into slurries, precast reinforced 8 and assembling reinforcing bar 9 between promptly connect through branch sleeve 2 fixing.
Because prefabricated units 1 have L shaped turning with lower member 3; So adopting, elastomeric pad 4 divides body structure; Promptly the elastomeric pad 4 of a part is coated on the nearly lower member of prefabricated units 1 sidewall 3 places; And the end to end closed circular that is, 4 upper surfaces that place lower member 3 of the elastomeric pad of another part, and at prefabricated units 1 outer rim formation closed circular.The shape of Sealing formboard 5 main bodys and said prefabricated units 1 form fit have rectangular-shaped inner chamber, and its lower end horizontal-extending are provided with flange 10.The main part of Sealing formboard 5 is set in outside elastomeric pad 4 and the prefabricated units 1, and through stirrup 7 Sealing formboard, elastomeric pad 4 and prefabricated units 1 three is fixed.10 of flanges are pressed on the elastomeric pad 4 that is arranged on the lower member 3, and pass through flange 10, the elastomeric pad 4 and lower member 3 bolts of said Sealing formboard 5 through adjustment bolt 6.
Thus, through elastomeric pad 4 and Sealing formboard 5 prefabricated units 1 and lower member 3 are sealed into one.During slip casting, slurries overflow in the inside and both gaps of back entering prefabricated units 1 and lower member 3 from both ends open in the branch sleeve 2, and by elastomeric pad 4 and Sealing formboard 5 shutoff, have guaranteed the grouting pressure in the branch sleeve 2.The elastomeric material that elastomeric pad 4 can adopt intensity and elasticity to satisfy required performance is processed, like vulcanized butyl rubber etc. not.
Present embodiment 1 provides a kind of lower member 3 to have the hermetically-sealed construction at turning with prefabricated units 1 joint, is equally applicable to the prefabricated units 1 of cylindric or prism-shaped so it should be recognized by those skilled in the art that above-mentioned hermetically-sealed construction.
Embodiment 2:
Present embodiment provides the hermetically-sealed construction under the another kind of situation, and referring to Fig. 2, lower member 3 has identical cross section with prefabricated units 1, so can adopt an elastomeric pad 4 that the two is sealed simultaneously.Be that 4 times halves of elastomeric pad are coated on surface, lower member 3 nearly prefabricated units 1 place, its first half is coated on surface, prefabricated units 1 nearly lower member 3 places, and the whole end to end closed circular that is.Sealing formboard 5 then integral body compresses sealing through twice stirrup 7 afterwards with elastomeric pad 4 suits.
In conjunction with above-mentioned apparatus structure, the installation step of this hermetically-sealed construction is following:
After said prefabricated units 1 and lower member 3 are docked completion, coat elastomeric pad 4 in the surface at said prefabricated units 1 nearly lower member 3 places, and at surface, lower member 3 nearly prefabricated units 1 place coating elastomeric pad 4.
The said Sealing formboard 5 of suit on elastomeric pad 4;
Adopt adjustment bolt 6 and/or stirrup 7 that said Sealing formboard 5, elastomeric pad 4 are fixed on said prefabricated units 1 and lower member 3 at last.
Although abovely carry out detailed description through numerous different embodiment for the utility model embodiment, the scope of law that it will be appreciated by those skilled in the art that this description is limited the words of the utility model appending claims.It only is exemplary that this detailed description should be interpreted as, rather than describes each possible embodiment.For the sealing of using reinforcing steel bar connecting sleeve tube 2 positions in the architectural construction; Should according to the prefabricated units that are embedded with branch sleeve 21 and with the concrete shape of the lower member 3 of prefabricated units 1 assembling; And the structure of the two joint; Select the concrete structure of elastomeric pad 4 and Sealing formboard 5, and the two is pressed abd fixed on prefabricated units 1 and the lower member 3 through suitable connector.