CN216891939U - Detachable bent cap prestressing force buries sleeve device deeply - Google Patents

Abstract

The utility model discloses a detachable cover beam prestress deep-burying sleeve device, and relates to a cover beam prestress sleeve, which comprises a deep-burying sleeve and an anchor pad cylinder, wherein the deep-burying sleeve comprises a bottom plate, a through hole and a plurality of front fixing holes are formed in the bottom plate, the anchor pad cylinder comprises an anchor pad, a plurality of rear fixing holes matched with the fixing holes are formed in the anchor pad, and the front fixing holes are connected with the rear fixing holes through bolts. Compared with the prior art, bury anchor sleeve structure deeply through this method is pre-buried more stable, and intensity is great relatively to bury the concatenation of sleeve and anchor backing section of thick bamboo deeply and use, under guaranteeing to bury anchor sleeve's intensity prerequisite deeply, bury telescopic demolition deeply after the concrete placement completion of being convenient for, bury the sleeve deeply after demolising and can recycle.

Description

Detachable bent cap prestressing force buries sleeve device deeply

Technical Field

The utility model relates to a prestressed sleeve of a cover beam, in particular to a detachable and reusable sleeve.

Background

In the pre-stress construction of the cover beam, the pre-reservation of the pre-stress tension end groove is carried out by adopting a PVC pipe deep-buried sleeve in the conventional method. Because the PVC pipe body has low strength, on one hand, the deformation is easily generated in the later concrete pouring process to cause the abnormal shape of the capping beam end, which is not beneficial to the control of the solid structure; on the other hand, after pouring is finished, the sleeve structure is generally reserved in the bent cap structure or is subjected to crushing treatment because the sleeve structure is difficult to remove, so that cost control is not facilitated; meanwhile, the connecting part between the sleeve and the anchor plate has the defect of insufficient engaging force, and is not beneficial to the post-prestressed tensioning operation.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides the detachable cover beam prestress deep-buried sleeve device, the pre-buried deep-buried anchor sleeve in the application has a more stable structure and relatively higher strength, and the deep-buried sleeve and the anchor pad sleeve are spliced for use, so that the deep-buried sleeve can be conveniently detached after concrete pouring is finished on the premise of ensuring the strength of the deep-buried anchor sleeve, and the detached deep-buried sleeve can be repeatedly used.

In order to solve the technical problems, the utility model is solved by the following technical scheme: a method for applying a cover beam prestress deep-buried anchor comprises the following steps: step A: pre-tapping a cover beam end template according to a cover beam prestress construction drawing, inserting a deep-buried sleeve into a hole, and then spot-welding and fixing the deep-buried sleeve and the cover beam end template into a whole by using short steel bars; and B: erecting and welding the bent cap steel reinforcement framework, and then installing and fixing a prestressed pipeline in the bent cap steel reinforcement framework; and C: fixing an anchor pad cylinder on the deep-buried sleeve through a bolt, wherein the anchor pad cylinder is provided with a spiral rib coaxial with the anchor pad cylinder, the joint of the anchor pad cylinder and the deep-buried sleeve is sealed by an adhesive tape after the anchor pad cylinder and the deep-buried sleeve are fixed, and then pearl cotton is used for wrapping; step D: brushing a release agent on the bent cap template, then installing the bent cap template, enabling the center of the hole of the anchor pad cylinder to be consistent with the center of the hole of the prestressed pipeline after the installation, and adjusting the positions of other reinforcing steel bars if the anchor pad cylinder and the spiral reinforcing steel bars collide with other reinforcing steel bars; step E: pulling out the prestressed pipeline to the deep-buried sleeve, then putting in the prestressed steel strand, and filling, plugging and sealing the joint of the prestressed pipeline and the deep-buried sleeve through foam rubber after putting in the prestressed steel strand; step F: and pouring the bent cap template, after pouring is finished and concrete is cured to 100% of the design strength, detaching the bolts to separate the anchor pad barrel from the deep-buried sleeve, although the bent cap template is disassembled.

In the above technical scheme, preferably, in the step a, after the deep-buried sleeve is inserted into the hole, the joint of the deep-buried sleeve and the capping beam end formwork is filled, sealed and sealed by using foam rubber.

In the above technical solution, preferably, in step F, if the capping beam end formwork cannot be recycled, the short steel bars between the deeply buried sleeve and the capping beam end formwork are cut off, and the deeply buried sleeve is recycled.

In the above technical scheme, preferably, the prestressed pipe is fixed by a # -shaped short steel bar during installation, and does not displace during concrete pouring, and if the prestressed pipe collides with a common steel bar, the position of the prestressed pipe is ensured to be unchanged, and the position of the steel bar is adjusted.

The detachable cover beam prestress deep-burying sleeve device comprises a deep-burying sleeve and an anchor cushion cylinder and is characterized in that the deep-burying sleeve comprises a bottom plate, a through hole and a plurality of front fixing holes are formed in the bottom plate, the anchor cushion cylinder comprises an anchor cushion plate, a plurality of rear fixing holes matched with the fixing holes are formed in the anchor cushion plate, and the front fixing holes and the rear fixing holes are connected through bolts.

In the above technical solution, preferably, the anchor pad holder further includes a rewinding drum, and a cross section of the rewinding drum is trapezoidal.

In the above technical solution, preferably, a spiral rib is wound around the outer circumference of the rewinding drum, and the spiral rib is coaxial with the rewinding drum.

In the above technical scheme, preferably, an adhesive tape is wound between the deeply buried sleeve and the anchor pad cylinder, and pearl wool is wrapped on the adhesive tape.

In the above technical solution, preferably, the deeply buried sleeve and the anchor pad cylinder are both made of steel.

The anchor sleeve that will bury deeply in this application falls into two parts, and partly be the sleeve that buries deeply, and another part is the anchor pad section of thick bamboo, and both concatenations form, wherein bury deeply the sleeve setting on the side form, in the anchor pad section of thick bamboo sets up the inner bent cap. After the concrete pouring of the cover beam is finished, the deeply buried sleeve can be detached from the anchor pad barrel, so that the deeply buried sleeve or the side template can be recycled. The connection of deeply buried sleeve and anchor pad cylinder is through the bolt, also only needs to unscrew the bolt when demolising, and it is very convenient to disassemble the process, and can not cause any damage to bent cap concrete or side form.

Compared with the prior art, the embedded anchor sleeve deeply buried through the method is more stable in structure and relatively large in strength, the embedded anchor sleeve and the anchor cushion sleeve are spliced for use, the dismantling of the embedded anchor sleeve after concrete pouring is finished is facilitated on the premise that the strength of the embedded anchor sleeve is guaranteed, and the dismantled embedded anchor sleeve can be recycled.

Drawings

FIG. 1 is a front view of a deep buried sleeve according to the present invention.

Fig. 2 is a perspective view of the deep-buried sleeve of the present invention.

FIG. 3 is a side schematic view of an anchor pad of the present invention.

Fig. 4 is a perspective view of the anchor pad cartridge of the present invention, schematically illustrated in fig. 1.

Fig. 5 is a perspective view of the anchor pad cartridge of the present invention, schematically illustrated in fig. 2.

Detailed Description

Example 1: as shown in fig. 1 to 5, a detachable capping beam prestress deep-burying sleeve device comprises a deep-burying sleeve 1 and an anchor pad cylinder 2, wherein the deep-burying sleeve 1 comprises a bottom plate 11, a through hole 13 and a plurality of front fixing holes 12 are arranged on the bottom plate 11, the anchor pad cylinder 2 comprises an anchor pad 21, a plurality of rear fixing holes 22 matched with the fixing holes are arranged on the anchor pad 21, and the front fixing holes 12 are connected with the rear fixing holes 22 through bolts. The anchor pad cylinder 2 further comprises a reverse cylinder 23, and the cross section of the reverse cylinder 23 is trapezoidal. The outer ring of the rewinding barrel 23 is wound with a spiral rib 24, and the spiral rib 24 is coaxial with the rewinding barrel 23.

A method for applying a cover beam prestress deep-buried anchor comprises the following steps: pre-perforating a cover beam end template according to a cover beam prestress construction drawing, and fixing the deeply buried sleeve 1 and the short steel bar into a whole by spot welding. The deep sleeve 1 adopts straight seam electric welding steel pipes (50 mm x 500 mm) with the wall thickness t =6mm on the barrel body, the bottom plate 11 adopts steel plates (4M 10 x 35 bolts are reserved) with the thickness t =6mm, and the sleeve and the bottom plate are made of Q235C steel.

And (4) processing the steel bars, wherein steel bar workers should be familiar with drawings to sample the steel bars according to the design requirements of the drawings, and can pay the steel bar workers to discharge the steel bars after the sampling is finished. In the steel bar blanking process, the quality is strictly closed. And the quality worker needs to randomly spot check the background blanking length and compare the background blanking length with the length of the reinforcement worker's long material list, and the quality worker needs to make again when the error is larger than the standard requirement. And (4) connecting the reinforcing steel bars, connecting the reinforcing steel bars on the jig frame, marking the space between the main reinforcing steel bars on the jig frame by using chalk according to the design requirement, and connecting the main reinforcing steel bars one by one. Before the steel bar is welded, the test welding is carried out according to the construction conditions, and formal welding can be carried out after the steel bar is qualified. The welder must take the examination certificate to post. The cushion blocks are arranged between the steel bars and the template, the cushion blocks are cement silica powder cushion blocks which are not lower than the strength of the bent cap concrete, the cushion blocks are through cushion blocks and are staggered with each other, the side faces are arranged at intervals of 2m, the floor is arranged at intervals of 1m in a quincunx manner, the position is ensured to be accurate, the thickness of the protective layer cannot meet the requirement, special points are required to be encrypted, the thickness of the net protective layer of the longitudinal and transverse steel bars meets the design requirement, and the pre-embedded steel bars such as the stop blocks, the cushion stones and the like are noticed.

The installation of the prestressed pipeline is strictly carried out according to the design requirement, the accuracy of the coordinate position is ensured, the installation is fixed by adopting a short reinforcing steel bar shape of #, so that the prestressed pipeline is firmly arranged at the design position in the template and does not generate displacement during the concrete pouring. Pipeline positioning steel bar spacing: the straight line section is 0.5m, the curve section is 0.3m, the smooth circle and straight line section of the curve section of the pipeline are ensured, and the external protection beam penetrating construction is carried out on the pipeline beam penetrating by adopting a core lining pipe. If the position of the pipeline is collided with the common steel bar, the position of the pipeline is ensured to be unchanged, and the steel bar can be slightly adjusted. The plastic corrugated pipe is subjected to hot melting welding by a special welding machine or is connected by a plastic structure connector with sealing performance according to requirements, and adhesive tape paper binding connection is not required. After the pipeline is installed, the end of the pipeline is sealed by adhesive tape to prevent water or other sundries from entering. And after the prestressed pipeline is installed, the welding operation is strictly forbidden so as to prevent the pipeline from being burnt and cause slurry leakage. Before the prestressed capping beam is cast with concrete, the prestressed pipe should be checked for air leakage and fracture. So as to prevent slurry leakage and influence bundle penetration, and check whether the grouting hole is in good condition and in place.

The prestressed working anchor backing plate is fixedly installed, an anchor backing tube 2 is fixed on a cover beam end mould deep-buried sleeve 1 through bolts, the joint is sealed through an adhesive tape, and finally pearl wool is used for wrapping to prevent slurry leakage, so that accurate positioning is required during installation. During lofting, construction must be strictly carried out according to the drawing size, the anchor pad cylinder 2 and the bent cap end die are installed together after being fixed, the anchor pad cylinder 2 must be perpendicular to the steel beam axis, and the center of the hole of the anchor pad cylinder 2 is consistent with the center of the pipeline, so that the center of the anchor pad cylinder 2 is strictly centered when the jack is installed, and the phenomena of thread slipping and beam breakage are prevented. If the inverted cylinder 23 and the spiral rib 24 collide with other common steel bars, the position of the common steel bars can be properly adjusted, the spiral rib 24 and the positioning rib thereof can be spot-welded together, and the inverted cylinder 23 and the spiral rib 24 must be coaxial and perpendicular to the prestressed steel bundles.

The capping beam end template and the side template are installed, a release agent (salad oil) is brushed on the side template, the end template and the bottom template, then the capping beam template is installed by adopting a crane, the templates are connected by a screw rod after being sealed by a sticky tape, the installed templates are smooth and appropriate in line type, the joints are tight and flat, and the positions are accurate. The bent cap bottom die is installed on the I-shaped steel along the bridge direction, and a gap between the template and the pier body is tightly filled with template glue. The bent cap side die is fixed by upper and lower split bolts, and the middle of the bent cap side die is reinforced on the I-shaped steel of the bracket along the bridge direction by a channel steel inclined strut. The capping beam end die is fixed by arranging two inclined struts on the top surface and the middle of the channel steel.

The prestress steel strand is stranded in a prestress mode, the diameter of the prestress steel strand is 15.2mm, the performance of the prestress steel strand is required to meet the national standard regulation of GB/T5224-2014, the standard strength is fpk =1860Mpa high-strength low-relaxation steel strand, the nominal area of each strand is 140mm2, and Ep =1.95 x 105 MPa. The steel strands are packaged into round bundles when leaving a factory, and the whole steel strand bundles are placed into the safety fixing frame to be cut and bound during blanking, so that the steel strands are prevented from popping out to hurt people. The cutting adopts a grinding wheel cutting machine. The length of the steel strand is recorded as the working length of 80cm at the tensioning end. And after the prestressed tendons are penetrated, foam rubber is adopted to fill and plug the gaps of the prestressed pipelines, so that slurry leakage is prevented.

During concrete construction, the elevation of the pier top needs to be rechecked before the capping beam is poured, and the concrete can be poured after the elevation is ensured to be correct. The concrete is poured by adopting a pump truck, the concrete is poured and vibrated in layers, the thickness of each layer is controlled to be about 30cm, and the concrete is vibrated by adopting a phi 50 inserted vibrator. The concrete pouring sequence of the large cantilever arm or the large-span cover beam is as follows: from the cantilever or midspan to the pier top position. The bent cap concrete is poured before the initial setting of the concrete, the concrete is vibrated compactly, and particularly the concrete under the anchor needs to be compacted.

The method comprises the following steps of removing a deeply buried sleeve, removing the deeply buried sleeve after concrete pouring is finished and curing is carried out until the designed strength reaches 100%, only unscrewing bolts when removing the deeply buried sleeve, removing the deeply buried sleeve 1 and a template together, leaving an anchor pad cylinder 2 in concrete, and tearing off an adhesive tape and pearl wool between the deeply buried sleeve 1 and the anchor pad cylinder 2 together.

Claims (5)

1. The detachable cover beam prestress deep-burying sleeve device comprises a deep-burying sleeve and an anchor cushion cylinder and is characterized in that the deep-burying sleeve comprises a bottom plate, a through hole and a plurality of front fixing holes are formed in the bottom plate, the anchor cushion cylinder comprises an anchor cushion plate, a plurality of rear fixing holes matched with the fixing holes are formed in the anchor cushion plate, and the front fixing holes and the rear fixing holes are connected through bolts.

2. A detachable cap beam prestressed deep burying sleeve device as claimed in claim 1, wherein said anchor pad cylinder further includes a reverse cylinder, said reverse cylinder being trapezoidal in cross section.

3. A detachable cap beam prestressed deep burying sleeve device as claimed in claim 2, wherein said rewinding is externally wound with a spiral rib, said spiral rib being coaxial with said rewinding.

4. The detachable prestressed deep-buried sleeve device for a cover beam as claimed in claim 1, wherein an adhesive tape is wound between the deep-buried sleeve and the anchor pad cylinder, and the adhesive tape is wrapped with pearl wool.

5. A detachable cap girder pre-stressed deep-buried sleeve device according to claim 1, wherein the deep-buried sleeve and the anchor pad cylinder are made of steel.

Images