CN218932854U - Anti-loose structure for expansion joint of comb plate - Google Patents
Anti-loose structure for expansion joint of comb plate Download PDFInfo
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- CN218932854U CN218932854U CN202222958462.7U CN202222958462U CN218932854U CN 218932854 U CN218932854 U CN 218932854U CN 202222958462 U CN202222958462 U CN 202222958462U CN 218932854 U CN218932854 U CN 218932854U
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Abstract
The utility model relates to an anti-loosening structure for an expansion joint of a comb plate, which comprises comb steel plates, sleeves and bolts, wherein the comb steel plates are anchored with expansion joint anchoring concrete by the aid of the sleeves and the bolts, the sleeves are anchored in the expansion joint anchoring concrete, the bolts penetrate through holes in the comb steel plates and are in threaded connection with the sleeves, the sleeves are connected with planting steel bars implanted into beam top concrete by means of double-sided welding, and the sleeves are connected into a whole through sleeve connecting steel bars and distributed steel bars. According to the structure, the special sleeve bolts are adopted to anchor the comb plate, so that the engagement height of the wire teeth and the overall stress performance of the structure are increased, and the anchoring performance of the fastener is improved; meanwhile, the buffer contact surface is additionally arranged, so that the running load is ensured to be uniformly distributed, and the impact effect of the running of the vehicle on the toothed plate is reduced, thereby effectively avoiding the loosening situation of the fastener and being beneficial to the normal passing of the expressway.
Description
Technical Field
The utility model relates to a maintenance and reconstruction technology of an expansion joint of a comb plate of a highway, in particular to an anti-loosening structure of the expansion joint of the comb plate.
Background
The expansion joint of the comb plate has the advantages of large expansion amount, stable running, low noise amount, convenient construction and the like, and is widely applied to long bridges. The device mainly comprises a telescopic device, a high-strength anchoring bolt and an anchoring end concrete.
Taking the municipal maintenance and management of S32 expressway as an example, the existing comb plate expansion joint has 1500 blocks. With the increase of the service life of highways and the increase of heavy-duty vehicles, different degrees of damage occur successively along the expansion joints of the comb plate, and the damage form is most common in the case of loosening the comb plate. If the toothed plate loosening disease cannot be timely and effectively repaired, the steel plate is deformed in a buckling way, and great potential safety hazards are brought.
At present, the toothed plate loosening disease is usually repaired according to the original design. When the screw thread of the bolt is damaged, the pavement concrete is excavated again, the high-strength bolt is planted, the toothed plate is installed after the concrete is poured, the screw cap is screwed up, and epoxy glue is applied for sealing. After the repairing by adopting the traditional process, the nut is still easy to loosen under the action of a heavy-duty vehicle, and if the nut is not fastened in time, the damage caused by shearing and shearing of the bolt, the warping deformation of the toothed plate and other diseases are induced, so that the toothed plate is loosened, and the driving safety is endangered. Therefore, the root of eliminating the loosening defect of the toothed plate is to avoid the occurrence of the loosening condition of the nut.
At present, the method for preventing the nut from loosening at home and abroad mainly comprises three types, namely friction loosening prevention, mechanical loosening prevention and permanent loosening prevention, and the mechanical loosening prevention and the permanent loosening prevention methods are not applicable to the comb plate structure. The three friction anti-loosening schemes of the spring gasket, the double nuts and the self-locking nuts are researched and compared, and the spring gasket is the anti-loosening scheme commonly adopted by the traditional process, has poor effect and is not suitable for dynamic load environments; the double nuts have requirements on the structural height and are not suitable for the comb plate structure; the locking technology of the 30-degree wedge thread of the self-locking nut can prevent the bolt from loosening to a great extent, but because the comb plate needs to be regularly dismantled to clean garbage, the process can cause irreversible damage to the thread of the self-locking nut, and the screw is influenced by factors such as the height limit of the fastening of the nut, environmental corrosion and the like, and the nut can still loosen after being used for 1-2 years.
Based on this, only if the current bolt anchoring form is changed, the fastening height can be maximized by adopting the socket bolt structure. Meanwhile, gaps are not basically formed between the bolts and the nuts in the bolt-cap integrated structure, and adverse effects caused by corrosion expansion are also greatly reduced. In addition, by adopting some damping measures, such as adding a buffer contact surface, the running load is ensured to be uniformly distributed, and the impact effect of the running of the vehicle on the toothed plate is reduced. Thereby avoiding the loosening of the bolt to the maximum extent.
Disclosure of Invention
In order to solve the problems of temporary treatment, frequent disease, multiple repair times and the like in the prior art, the utility model provides a novel anti-loosening structure for an expansion joint of a comb plate, which adopts a special sleeve bolt to anchor the comb plate, so that the occlusion height of a wire tooth and the overall stress performance of the structure are increased, and the anchoring performance of a fastener is improved; meanwhile, the buffer contact surface is additionally arranged, so that the running load is ensured to be uniformly distributed, and the impact effect of the running of the vehicle on the toothed plate is reduced. Therefore, the occurrence of loosening of the fastener is effectively avoided, and the normal traffic of the expressway is facilitated.
In order to achieve the above object, the technical scheme of the present utility model is as follows: the utility model provides a locking structure of broach board expansion joint, includes broach steel sheet, sleeve and bolt, broach steel sheet adopts sleeve and bolt and expansion joint anchor concrete anchor, and wherein, sleeve anchor is in expansion joint anchor concrete, and the bolt passes through-hole and sleeve threaded connection on the broach steel sheet, and the sleeve adopts two-sided welding to connect the planting reinforcing bar of planting in the roof beam concrete, then links into a whole through sleeve connection reinforcing bar and distribution reinforcing bar between the sleeve.
Further, the bolt and the sleeve are connected through threaded mechanical engagement and epoxy adhesive.
Further, the whole height of the sleeve is 12cm, and the contact surface of the sleeve and the concrete adopts a thread structure; the bottom is 7cm high, and a round hole with a diameter of 13mm is formed in the middle; the top 5cm is of a threaded structure with threads, and the diameter of the internal thread of the sleeve is matched with the size of the bolt.
Further, the diameter of the bolt is consistent with the original planting bolt size of the comb-tooth steel plate, the height of the bolt cap of the bolt is 7mm, and the top surface of the installed bolt cap is more than 1cm lower than the top surface of the comb-tooth steel plate.
Further, the planted steel bars adopt HRB400, the diameter is 12mm, the depth of the planted steel bars is not less than 150mm, and the overlap joint length of the planted steel bars and the sleeve is not less than 6cm; the diameter of the sleeve connecting steel bar is 12mm, and the sleeve connecting steel bar passes through the sleeve round hole and is connected with each sleeve in a spot welding mode.
Further, a buffer contact layer structure is additionally arranged between the comb tooth steel plate and the expansion joint anchoring concrete, the buffer contact layer structure comprises a leveling layer and a buffer layer from top to bottom, the leveling layer is formed by epoxy mortar or epoxy resin or MMA mortar thin layer materials, and the surface flatness after paving is not more than 1mm; the buffer layer is made of rubber plastic products, the thickness is 2mm, and the buffer layer is paved in a whole piece.
Further, the sleeve connecting steel bars and part of the distributed steel bars are processed into an integral bracket for embedding, so that sleeve intervals are unified, and the subsequent bolt installation construction is facilitated.
Due to the adoption of the technical scheme, the utility model has the following beneficial effects:
1. the loosening disease of the comb plate is greatly reduced, and the normal traffic of the expressway is facilitated.
2. The maintenance frequency is greatly reduced, and the economical efficiency is better in the long term.
3. People are on the road smoothly, social complaints are reduced, and contradiction disputes are reduced.
Drawings
FIG. 1 is a plan view of an expansion joint of a comb plate;
FIG. 2 is a section A-A of FIG. 1;
FIG. 3 is a detailed construction view of a sleeve bolt;
FIG. 4 is a plan view of a pre-buried sleeve bracket;
fig. 5 is an elevation view of the embedment sleeve bracket.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
As shown in fig. 1 to 5, in the anti-loosening structure of the expansion joint of the comb plate, the sleeve 3 and the bolt 2 are adopted to anchor the comb steel plate 1, so that the wire bite height and the integral stress performance of the structure are increased, and the anchoring performance of the fastener is improved; meanwhile, the buffer contact surface is additionally arranged, so that the load of the travelling crane is uniformly distributed, and the impact effect of the travelling crane on the toothed plate is reduced.
The whole height of the sleeve 3 is 12cm, and the contact surface of the sleeve and the concrete 4 adopts a thread structure. The bottom 7cm is designed into a solid cylinder structure, and a round hole with a diameter of 13mm is formed in the middle; the top 5cm is of a threaded structure with threads, and the diameter of the sleeve 3 is matched with the size of the bolt 2.
The diameter of the bolt 2 is the same as the original planting bolt of the comb-tooth steel plate 1, and the types of the bolt are 16mm, 20mm, 24mm and the like. The height of the bolt cap is about 7mm, and the top surface of the installed bolt cap is slightly lower than the top surface of the toothed plate by more than 1 cm. The bolt wire anchoring depth is (h 1-0.7+2.5) cm, typically about 30-40 mm, depending on the tooth plate thickness.
The bolt 2 and the sleeve 3 are connected through screw mechanical engagement and epoxy adhesive.
The planted steel bars 7 are HRB400 with the diameter of 12mm and the depth of planted steel bars not less than 150mm, and are connected with the sleeve 3 by double-sided welding, and the lap joint length is not less than 6cm; the sleeves 3 are connected into a whole through sleeve connecting steel bars 8 and distributing steel bars 9, the diameter of each sleeve connecting steel bar 8 is 12mm, and the sleeve connecting steel bars pass through round holes of the sleeves 3 and are connected with the sleeves 3 through spot welding; the sleeve connecting steel bars 8 and the distributing steel bars 9 are HRB400, the diameter is 12mm, and the arrangement interval is 100mm.
A buffer contact layer structure 6 is additionally arranged between the comb tooth steel plate 1 and the concrete 4, and the structure comprises a leveling layer and a buffer layer from top to bottom. The leveling layer is made of thin-layer materials such as epoxy mortar, epoxy resin or MMA mortar, and the surface flatness after paving is not more than 1mm; the buffer layer is made of rubber plastic products, has the thickness of 2mm, is paved in a whole block, and is arranged in a range of avoiding the center 2D (diameter of the sleeve) of the sleeve.
As shown in fig. 4 and 5. The sleeve 3, the sleeve connecting steel bars 8 and part of the distributed steel bars 9 are processed into an integral bracket for pre-burying so as to unify parameters such as sleeve spacing and the like and facilitate subsequent bolt installation and construction.
The maintenance and repair construction flow of the comb plate expansion joint anti-loosening structure comprises the following steps: (1) chiseling and cleaning, and (2) installing a positioning bracket. (3) Planting roof steel bars and welding, (4) distributing longitudinal distribution steel bars, (5) pouring underlying concrete, (6) buffering contact layer construction, (7) installing comb plates and components thereof, and (8) installing bolts.
The utility model is applicable to two types of situations: firstly, aiming at the situation of bolt shearing damage caused by loosening of the toothed plate, the anti-loosening structure provided by the utility model is adopted after excavation; secondly, the anti-loosening structure provided by the utility model is adopted in new construction. For new construction, the chisel removing construction links are reduced, but the installation gap of the comb plate is determined according to the construction air temperature. The following provides a method for performing maintenance.
Aiming at the expansion joint reconstruction example of the S32 inclined pond bridge comb plate, the utility model adopts the reconstruction schemes shown in figures 1 to 5, wherein the detailed structures of sleeve bolts, anchoring and reinforcement structures are shown in figures 2 to 3.
1. Chiseling and clearing
Cutting along the scribing position by using a pavement cutting machine, then chiseling off the white belt of the construction area by using a pneumatic pick, crushing the white belt to a beam surface, and gradually separating and removing concrete and reinforcing steel bars in the process.
2. Mounting and positioning bracket
After the concrete lying under the toothed plate is cleaned, the concrete is blown clean by an air compressor, so that the construction working surface is ensured to be clean and smooth. And then lofting and setting out the center position of the toothed plate bolt so as to install the embedded sleeve bracket.
3. Planting roof steel bars and welding
Drilling holes near the embedded sleeve, and planting roof steel bars. The roof steel bar adopts HRB400, the diameter is 12mm, the drilling depth is 150mm, and the bar planting adhesive adopts the Hirude hard bar planting adhesive. After the colloid is solidified, the top plate steel bars and the sleeve are welded, the welding mode adopts double-sided welding, and the lap joint length is not less than 6cm.
4. Distributing the steel bars longitudinally
The longitudinal distributed reinforcing steel bars adopt HRB400, the diameter is 12mm, and the arrangement interval is 100mm. And after the longitudinal distribution steel bars are distributed, carrying out spot welding connection with the transverse connection steel bars.
5. Pouring down lying concrete
The maintenance engineering generally adopts quick hardening steel fiber concrete, and the new construction engineering generally adopts common steel fiber concrete. The strength of the concrete reaches the C50 grade, and the blending amount of the steel fiber is about 60kg/m 3 . Before concrete is poured, cotton wool should be used to fill the sleeve to prevent the sleeve from being blocked by slurry overflow.
6. Construction of buffer contact layer
The leveling layer aims to finely level the underlying concrete surface, and different repairing materials can be adopted according to the thickness of the leveling layer. When the method is implemented, firstly, the thickness of the leveling layer is measured through a steel ruler and a guiding ruler, and if the thickness is within 2mm, epoxy glue is used for coating; if the thickness is within 2 mm-5 mm, building MMA mortar; if the thickness is more than 5mm, the epoxy mortar is built. After the leveling layer is implemented, the surface evenness of the concrete is ensured to be not more than 1mm. After the requirement is confirmed to be met, the rubber sheet is installed, the thickness of the rubber sheet is 2mm, the rubber sheet is paved in a whole block, in order to reduce adverse effects on stress of the sleeve bolt caused by reciprocating deformation in a local range, and no buffer material is required to be arranged in the range of the sleeve embedding center 2D (sleeve diameter).
7. Mounting comb plate and assembly thereof
And a rubber water stop, a stainless steel plate and a comb-shaped steel plate are sequentially installed.
8. Mounting bolt
The sleeve is first filled with epoxy adhesive, then the bolt is quickly tightened, and finally the cap is also filled with epoxy adhesive to provide durability in use.
Claims (7)
1. An anti-loosening structure of an expansion joint of a comb plate is characterized in that: the steel plate is anchored by adopting a sleeve and a bolt and an expansion joint anchoring concrete, wherein the sleeve is anchored in the expansion joint anchoring concrete, the bolt penetrates through a through hole in the steel plate and is in threaded connection with the sleeve, the sleeve is connected with planting steel bars in the roof beam concrete by adopting double-sided welding, and the sleeves are connected into a whole through sleeve connecting steel bars and distribution steel bars.
2. The comb plate expansion joint locking structure according to claim 1, wherein: the bolt is connected with the sleeve through threaded mechanical engagement and epoxy adhesive.
3. The comb plate expansion joint locking structure according to claim 1, wherein: the whole height of the sleeve is 12cm, and the contact surface of the sleeve and the concrete adopts a thread structure; the bottom is 7cm high, and a round hole with a diameter of 13mm is formed in the middle; the top 5cm is of a threaded structure with threads, and the diameter of the internal thread of the sleeve is matched with the size of the bolt.
4. The comb plate expansion joint locking structure according to claim 1, wherein: the diameter of the bolt is consistent with the original planting bolt size of the comb-tooth steel plate, the height of the bolt cap of the bolt is 7mm, and the top surface of the installed bolt cap is more than 1cm lower than the top surface of the comb-tooth steel plate.
5. The comb plate expansion joint locking structure according to claim 1, wherein: the planted steel bars adopt HRB400, the diameter is 12mm, the depth of the planted steel bars is not less than 150mm, and the overlap joint length of the planted steel bars and the sleeve is not less than 6cm; the diameter of the sleeve connecting steel bar is 12mm, and the sleeve connecting steel bar passes through the sleeve round hole and is connected with each sleeve in a spot welding mode.
6. The comb plate expansion joint locking structure according to claim 1, wherein: a buffer contact layer structure is additionally arranged between the comb tooth steel plate and the expansion joint anchoring concrete, the buffer contact layer structure comprises a leveling layer and a buffer layer from top to bottom, the leveling layer is formed by epoxy mortar or epoxy resin or MMA mortar thin layer materials, and the surface flatness after paving is not more than 1mm; the buffer layer is made of rubber plastic products, the thickness is 2mm, and the buffer layer is paved in a whole piece.
7. The comb plate expansion joint locking structure according to claim 1, wherein: the sleeve, the sleeve connecting bars and part of the distributed bars are processed into an integral bracket for pre-burying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222958462.7U CN218932854U (en) | 2022-11-07 | 2022-11-07 | Anti-loose structure for expansion joint of comb plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222958462.7U CN218932854U (en) | 2022-11-07 | 2022-11-07 | Anti-loose structure for expansion joint of comb plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218932854U true CN218932854U (en) | 2023-04-28 |
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ID=86092348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222958462.7U Active CN218932854U (en) | 2022-11-07 | 2022-11-07 | Anti-loose structure for expansion joint of comb plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218932854U (en) |
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2022
- 2022-11-07 CN CN202222958462.7U patent/CN218932854U/en active Active
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