CN115961545B - Assembled no pulling force telescoping device - Google Patents
Assembled no pulling force telescoping device Download PDFInfo
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- CN115961545B CN115961545B CN202310067154.1A CN202310067154A CN115961545B CN 115961545 B CN115961545 B CN 115961545B CN 202310067154 A CN202310067154 A CN 202310067154A CN 115961545 B CN115961545 B CN 115961545B
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Abstract
The invention provides an assembled tension-free expansion device, which relates to the technical field of bridges and is used for being arranged at an expansion joint between two adjacent beam bodies. According to the invention, no matter the opening amount of the expansion joint is increased or reduced, the elastomer is always in a tension-free state, so that the damage caused by the fact that the expansion joint is in a tension state when the opening amount of the traditional expansion joint is increased is avoided.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to an assembled tension-free expansion device.
Background
The bridge expansion joint is one of important members of bridge structure, and is mainly used for adapting to the elongation, shortening deformation and corner deformation of the beam body. However, because the expansion device at the expansion joint is positioned at the maximum deformation position of the beam end, the expansion device bears the rotational deformation and the longitudinal tension-compression deformation of the beam body under the action of various loads, and particularly in the areas with large temperature difference, the Liang Tisu short deformation is large, the elastic body of the expansion device is often in a stretching state, the elastic body is easy to stretch and crack, and the service life of the expansion device is further shortened.
Disclosure of Invention
The invention solves the problems that: how to improve the service performance and the service life of the filling type expansion device at the bridge expansion joint.
In order to solve the problems, the invention provides an assembled tension-free expansion device, which is arranged at an expansion joint between two adjacent beam bodies, wherein the assembled tension-free expansion device comprises a first anchoring block, a second anchoring block and an elastomer, the first anchoring block and the second anchoring block are respectively arranged on the two adjacent beam bodies, the elastomer comprises a polyurethane composite material, the elastomer is arranged between the first anchoring block and the second anchoring block and is in a compression state, and the elastomer is used for covering the expansion joint.
Optionally, the assembled tension-free expansion device further comprises a filling body, wherein the filling body is arranged in the expansion joint.
Optionally, the device further comprises a first leveling cushion layer and a second leveling cushion layer, wherein the first leveling cushion layer and the second leveling cushion layer are used for being respectively arranged on two adjacent beam bodies, the first anchoring block and the second anchoring block are respectively arranged above the first leveling cushion layer and the second leveling cushion layer, and the elastic body is supported on the first leveling cushion layer and the second leveling cushion layer.
Optionally, the assembled tension-free expansion device further comprises a seam crossing plate, wherein the seam crossing plate is located below the elastic body, two ends of the seam crossing plate are respectively supported on the first leveling cushion layer and the second leveling cushion layer, and the seam crossing plate is used for covering the expansion joint.
Optionally, the first anchoring block is cast on the first leveling cushion layer in a cast-in-situ mode, the material of the first anchoring block comprises polyurethane concrete, the compressive strength of the first anchoring block is more than 60MPa, and the flexural strength of the first anchoring block is more than 25MPa.
Optionally, the assembled tension-free telescopic device further comprises an anchor bolt sleeve and a bolt, wherein the anchor bolt sleeve penetrates through the second leveling cushion layer and the beam body, and the bolt penetrates through the second anchoring block and is in threaded connection with the anchor bolt sleeve.
Optionally, the first leveling pad layer and the first anchoring block are respectively connected with the beam body through anchoring steel bars.
Optionally, the elastomer has a bending strain of greater than 10000 μ at 30 degrees below zero.
Optionally, adhesive layers are respectively arranged between the first anchoring block and the elastic body and between the second anchoring block and the elastic body.
Optionally, the polyurethane composite material comprises a material A and a material B, and the preparation method of the elastomer comprises the following steps:
preheating the material A to 80 ℃, and vacuumizing under the condition of 0.95 of vacuum degree;
preheating the material B to 113-115 ℃ and vacuumizing under the condition of 0.95 of vacuum degree;
preheating the template to 110 ℃, uniformly dispersing the material A and the material B at 80-90 ℃,
pouring the dispersed material A and the dispersed material B into a test piece at the temperature of 110-115 ℃;
vulcanizing the test piece at 120 ℃ for 1 to 1.5 hours, removing the template, and vulcanizing the test piece at 120 ℃ for 8 to 12 hours;
and cooling the post-vulcanized test piece to normal temperature to form the elastomer.
Compared with the prior art, the invention has the beneficial effects that:
the first anchoring block of the assembled tension-free telescopic device and the second anchoring block of the assembled tension-free telescopic device are respectively arranged on the two adjacent beam bodies, the elastic body comprises a polyurethane composite material, the elastic body is arranged between the first anchoring block and the second anchoring block and is in a compressed state, and the elastic body covers an expansion joint between the two adjacent beam bodies. Therefore, after the construction of the assembled tension-free expansion device is completed, a certain compression deformation amount of the expansion joint can be realized in advance, when the beam body is shortened and deformed, the opening amount of the expansion joint is increased, and the polyurethane composite material adapts to the deformation of the expansion joint by utilizing the ultrahigh deformation recovery capability of the polyurethane composite material. When the beam body is subjected to elongation deformation, the opening amount of the expansion joint is reduced, and the polyurethane composite material bears pressure and adapts to the requirement of compression deformation by utilizing the compressive resistance and compression deformation capacity of the polyurethane composite material. That is, no matter the opening amount of the expansion joint is increased or reduced, the elastic body is always in a tension-free state, so that the elastic body is prevented from being in a tension state when the opening amount of the traditional expansion joint is increased, and damage is avoided.
Meanwhile, the polyurethane composite material is good in flexibility and energy absorption effect, has a good buffering effect on the vehicle load effect, and the first anchoring block and the second anchoring block provide rigidity transition, so that the assembled tension-free expansion device is comfortable in driving and small in vibration noise, and the problem that the vibration noise of a traditional expansion joint is large is solved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an assembled tension-free telescoping device of the present invention;
FIG. 2 is a schematic view of an assembled tension-free telescoping device with two adjacent beams not installed in the invention;
FIG. 3 is a schematic view of an embodiment of a second anchor block according to the present invention;
FIG. 4 is a schematic view of an embodiment of a temporary plate according to the present invention;
FIG. 5 is a schematic view of an embodiment of a pre-buried plate according to the present invention;
FIG. 6 is a schematic view of one embodiment of a preformed anchor block according to the present invention;
FIG. 7 is a cross-sectional view of one embodiment of an elastomer of the present invention;
FIG. 8 is a schematic structural view of one embodiment of a cross-stitch plate in accordance with the present invention.
Reference numerals illustrate:
1. a first anchor block; 2. a second anchor block; 3. a first leveling pad layer; 4. a second leveling pad layer; 5. an elastomer; 6. a joint crossing plate, 7 and a filling body; 8. an anchor bolt sleeve; 9. a bolt; 10. a beam body; 11. a first pavement layer; 12. the second pavement layer; 13. expansion joint concrete; 14. an expansion joint; 15. reinforcing steel bars; 101. a step structure; 21. a temporary plate member; 22. pre-burying a plate; 23. prefabricating an anchor block; 24. embedding a bolt fixing plate; 211. a first waist-shaped hole; 212. a first aperture structure; 221. a clamping block; 222. a second aperture structure; 231. a second waist-shaped hole; 232. a fourth pore structure; 241. a third pore structure; 51. an avoidance groove; 52. a clamping groove; 61. a horizontal section; 62. a vertical section.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.
As shown in fig. 1, an embodiment of the present invention provides an assembled tension-free expansion device, which is used for being disposed at an expansion joint 14 between two adjacent beams 10, the assembled tension-free expansion device includes a first anchoring block 1, a second anchoring block 2 and an elastic body 5, the first anchoring block 1 and the second anchoring block 2 are respectively disposed on the two adjacent beams 10, the material of the elastic body 5 includes a polyurethane composite material, the elastic body 5 is disposed between the first anchoring block 1 and the second anchoring block 2 and is in a compressed state, and the elastic body 5 is used for covering the expansion joint 14.
In this embodiment, the assembled tension-free expansion device refers to an expansion joint which is arranged at a proper position along the direction of a building or a construction joint of the building in order to prevent the building component from generating cracks or damages due to the change of weather temperature (thermal expansion and cold contraction). The assembled tension-free expansion device divides building components such as wall, floor, roof (except wood roof) and the like above the foundation into two independent parts, so that the building or structure can horizontally expand and contract along the length direction. The expansion joint will be exemplified as applied to a bridge.
As shown in fig. 2, one end of each of the two adjacent beam bodies 10 facing each other is provided with a step structure 101, the step structures of the two adjacent beam bodies 10 form a notch of the expansion joint 14, in this embodiment, when the first anchoring block 1 and the second anchoring block 2 are constructed, the two adjacent beam bodies 10 need to be leveled, i.e. the two adjacent beam bodies 10 are respectively provided with a first leveling pad layer 3 and a second leveling pad layer 4. That is, the fabricated tension-free expansion device includes a first anchor block 1, a second anchor block 2, a first leveling pad layer 3, a second leveling pad layer 4, and an elastic body 5, the first leveling pad layer 3 and the second leveling pad layer 4 are respectively poured on the step structures of the two beam bodies 10, the first anchor block 1 is poured on the first leveling pad layer 3, the second anchor block 2 is a prefabricated structure which is fixed on the second leveling pad layer 4, the material of the elastic body 5 includes a polyurethane composite material which is formed by combining several segments of prefabricated bodies 2m long, which are arranged between the first anchor block 1 and the second anchor block 2 and are in a compressed state, and the elastic body 5 is supported on the first leveling pad layer 3 and the second leveling pad layer 4 and is used for covering the expansion joint 14.
In this embodiment, the two adjacent beams 10 are further provided with a first paving layer 11 and a second paving layer 12 respectively, the first paving layer 11 is connected with the first leveling pad layer 3 and the first anchoring block 1 respectively, the second paving layer 12 is connected with the second leveling pad layer 4 and the second anchoring block 2 respectively, and the outer surfaces of the first paving layer 11, the first anchoring block 1, the elastic body 5, the second anchoring block 2 and the second paving layer 12 are flush. The first leveling cushion layer 3 and the second leveling cushion layer 4 play a role in leveling, so that the bottom surface of the elastic body 5 can be ensured to be in close contact with the beam body 10, and the void is avoided. Meanwhile, when the notch of the old bridge needs to be reduced, expansion joint concrete 13 can be additionally arranged at the notch of the two adjacent beam bodies 10.
In this embodiment, as shown in fig. 1, 5 and 7, matching clamping grooves 52 and clamping blocks 221 are respectively arranged on the elastic body 5 and the second anchoring block 2, when the elastic body 5 is installed, the elastic body 5 and the second anchoring block 2 are inclined at a certain angle respectively, by utilizing the excellent deformation and deformation recovery capability of the elastic body 5, the second anchoring block 2 is gradually changed into a horizontal state by applying vertical pressure to the second anchoring block 2, the second anchoring block 2 can drive the elastic body 5 to be gradually changed into a horizontal state under the action of the clamping blocks 221 and the clamping grooves 52 until the elastic body 5 is pressed into the horizontal state, and the compression amount is determined according to the opening amount of the expansion joint 14.
Thus, after the construction of the assembled tension-free expansion device is completed, a certain compression deformation amount of the expansion joint 14 can be realized in advance, when the beam body 10 is shortened and deformed, the opening amount of the expansion joint 14 is increased, and the polyurethane composite material adapts to the deformation of the expansion joint 14 by utilizing the ultrahigh deformation recovery capability of the polyurethane composite material. When the beam body 10 is subjected to elongation deformation, the opening amount of the expansion joint 14 is reduced, and the polyurethane composite material bears pressure and adapts to the requirement of compression deformation by utilizing the compressive resistance and compression deformation capacity of the polyurethane composite material. That is, no matter the opening amount of the expansion joint 14 is increased or decreased, the elastic body 5 is always in a tension-free state, so that the elastic body 5 is prevented from being in a tension state when the opening amount of the traditional expansion joint 14 is increased, and damage is avoided.
Meanwhile, the polyurethane composite material is good in flexibility and energy absorption effect, has a good buffering effect on the vehicle load effect, and the first anchoring block 1 and the second anchoring block 2 provide rigidity transition, so that the assembled tension-free expansion device is comfortable in driving and small in vibration noise, and the problem that the vibration noise of the traditional expansion joint 14 is large is solved.
Optionally, the assembled tension-free telescopic device further comprises a filling body 7, and the filling body 7 is used for being arranged in the expansion joint 14.
In this embodiment, the material of the filling body 7 includes foam, that is, the filling body 7 is a foam filling body, as shown in fig. 1, the vertical cross section of the foam filling body is circular, and the foam filling body is disposed at the upper ends of the expansion joints 14 of two adjacent beam bodies 10. Thus, when the first leveling pad layer 3 and the second leveling pad layer 4 are constructed, pad layer materials can be effectively prevented from falling into the expansion joint 14 between two adjacent beam bodies 10, and structural deformation is restrained. At the same time, rain infiltration is avoided, eroding the beam 10.
In this embodiment, the diameter of the foam filling body is larger than the width of the expansion joint 14 in a normal state, and when the foam filling body is installed, adhesive glue is firstly coated on the beam ends, and then the foam filling body is forcedly embedded into the expansion joint 14 between two adjacent beam bodies 10.
Optionally, the assembled tension-free expansion device further comprises a seam crossing plate 6, the seam crossing plate 6 is located below the elastic body 5, two ends of the seam crossing plate 6 are respectively supported on the first leveling cushion layer 3 and the second leveling cushion layer 4, and the seam crossing plate 6 is used for covering the expansion joint 14.
In this embodiment, the seam crossing plate 6 is made of steel plates, as shown in fig. 8, the seam crossing plate 6 is T-shaped, the horizontal sections 61 thereof are respectively disposed on the first leveling pad layer 3 and the second leveling pad layer 4, and the vertical sections 62 thereof are disposed in the gap between the first leveling pad layer 3 and the second leveling pad layer 4. In this way, the compressive properties of the seam crossing plate 6 and the elastic body 5 are utilized to bear the vertical pressure of the wheel load, so that the elastic body 5 is prevented from excessively vertical deformation.
In this embodiment, when the seam crossing plate 6 is installed, the first leveling cushion layer 3 and the second leveling cushion layer 4 are coated with 1mm of adhesive material respectively, and then the horizontal end of the seam crossing plate 6 is flattened, so that the horizontal end of the seam crossing plate 6 is tightly combined with the first leveling cushion layer 3 and the second leveling cushion layer 4 respectively.
In this embodiment, as shown in fig. 7, the lower end surface of the elastic body 5 is provided with a relief groove 51, and the horizontal end of the slit plate 6 is located in the relief groove 51. Thus, the lower end of the elastic body 5 is formed with oppositely disposed feet.
In other embodiments, other shaped support structures can be used instead of the T-shaped seam crossing plate to play a role in bearing the vertical pressure of the wheel load together with the elastomer. The method is not limited herein, and depends on the actual requirements.
Alternatively, the bending strain of the elastomer 5 at 30 degrees below zero is greater than 10000 μ.
In the present embodiment, the elastic body 5 has excellent bending deformation ability to accommodate the requirement of beam-end corner deformation. Preferably, the bending strain of the elastic body 5 at 30 degrees below zero is more than 10000 mu epsilon, so that the deformation requirement of the beam end corner under the high and low temperature condition can be met.
Optionally, the first anchoring block 1 is cast on the first leveling pad layer 3 in a cast-in-place mode, and the material of the first anchoring block 1 comprises polyurethane concrete.
In this embodiment, the material of the first anchoring block 1 includes polyurethane concrete, the first anchoring block 1 is cast on the first leveling pad layer 3 in a cast-in-place manner, and the beam body 10 is provided with the reinforcing steel bars 15 extending to the casting area of the first anchoring block 1, so that the first anchoring block 1 has good buffering performance, and damage to an anchoring area is avoided.
Specifically, the compressive strength of the first anchoring block 1 is more than 60MPa, and the flexural strength of the first anchoring block 1 is more than 25MPa.
Optionally, the anchor bolt sleeve 8 and the bolt 9 are further included, the anchor bolt sleeve 8 penetrates through the second leveling cushion layer 4 and the beam body 10, and the bolt 9 penetrates through the second anchoring block 2 and is in threaded connection with the anchor bolt sleeve 8.
In this embodiment, after the second leveling pad layer 4 is poured on the beam body 10, a hole is drilled on the second leveling pad layer 4 until the hole extends to the beam body 10, then the anchor bolt sleeve 8 is penetrated into the holes of the second leveling pad layer 4 and the beam body 10 and is fixed, a through hole for the shaft of the bolt 9 to penetrate is formed in the second anchoring block 2, and after the second anchoring block 2 is flattened to the second leveling pad layer 4, the bolt 9 penetrates through the second anchoring block 2 to be connected to the anchor bolt sleeve 8 in a threaded manner, so that the fixation of the second anchoring block 2 is realized.
In this embodiment, the second anchoring block 2 is prefabricated, as shown in fig. 3, 4, 5 and 6, and includes a temporary plate 21, an embedded plate 22, a prefabricated anchoring block 23 and an embedded bolt fixing plate 24, where the temporary plate 21 and the embedded plate 22 are made of steel plates, the prefabricated anchoring block 23 is made of polyurethane concrete by casting, during production, the temporary plate 21 is provided with a plurality of first waist-shaped holes 211 and first hole structures 212 along the width direction of the bridge, the embedded plate 22 is provided with a plurality of openings and second hole structures 222 along the width direction of the bridge, the embedded bolt fixing plate 24 is arranged in one-to-one correspondence with the openings, the embedded bolt fixing plate 24 is provided with at least two third hole structures 241, the prefabricated anchoring block 23 is provided with a second waist-shaped hole 231 and a fourth hole structure 232 along the width direction of the bridge, when the second anchor block 2 is not fixed on the second leveling pad layer 4, the upper end and the lower end of the prefabricated anchor block 23 are respectively connected with the temporary plate 21 and the embedded plate 22, namely, after the first hole structure 212, the fourth hole structure 232 and the second hole structure 222 are aligned, the connection is performed by using a screw, at this time, the first waist-shaped hole 211, the second waist-shaped hole 231 and the opening are aligned, the bolt 9 passes through the first waist-shaped hole 211 and the second waist-shaped hole 231 to enter the second anchor block 2, the shaft of the bolt 9 passes through the third hole structure 241 and the opening and is connected in the anchor bolt sleeve 8 by screw threads, after the installation of the bolt 9 is completed, the temporary plate 21 is disassembled, and then the second waist-shaped hole 231 is plugged by using concrete.
Optionally, adhesive layers are provided between the first anchor block 1 and the elastic body 5 and between the second anchor block 2 and the elastic body 5, respectively.
In this embodiment, when the elastic body 5 is mounted, it is necessary to apply adhesive materials of 1mm to the end surfaces of the first anchor block 1 and the elastic body 5 facing each other and to the end surfaces of the second anchor block 2 and the elastic body 5 facing each other, respectively, and after the elastic body 5 is mounted, adhesive layers are formed between the first anchor block 1 and the elastic body 5 and between the second anchor block 2 and the elastic body 5, respectively.
In this way, not only the connection of the elastic body 5 with the first anchor block 1 and the second anchor block 2 respectively is reinforced, but also the water seepage at the junctions of the elastic body 5 with the first anchor block 1 and the second anchor block 2 respectively is effectively avoided.
Alternatively, the first leveling pad layer 3 and the first anchor block 1 are connected to the beam body 10 through anchor bars 15, respectively.
In this embodiment, the first leveling pad layer 3 and the first anchoring block 1 are cast in situ respectively, and in one embodiment, two reinforcement cages with different heights are first arranged on the beam body 10 during construction, wherein the reinforcement cage with a lower height is used for cooperatively casting the first leveling pad layer 3, and the reinforcement cage with a higher height is used for cooperatively casting the first anchoring block 1. In another embodiment, the reinforcement cage for processing the first leveling pad layer 3 is first arranged on the beam body 10, and then after the first leveling pad layer 3 is processed, the reinforcement cage for processing the first anchoring block 1 is arranged on the first leveling pad layer 3. In this way, not only are the first leveling blanket 3 and the first anchor block 1 deformed in coordination with the beam body 10, respectively. And the bridge deck pavement material is protected from damage.
Optionally, the polyurethane composite material comprises a material A and a material B, and the preparation method of the elastomer 5 comprises the following steps:
s100, preheating the material A to 80 ℃, and vacuumizing under the condition of 0.95 of vacuum degree;
s200, preheating the material B to 113-115 ℃, and vacuumizing under the condition of 0.95 of vacuum degree;
s300, preheating a template to 110 ℃, uniformly dispersing the materials A and B at 80-90 ℃, and pouring a test piece at 110-115 ℃ after the materials A and B are dispersed;
s500, vulcanizing the test piece at 120 ℃ for 1 to 1.5 hours, removing the template, and vulcanizing the test piece at 120 ℃ for 8 to 12 hours;
and S600, cooling the post-vulcanized test piece to normal temperature to form the elastomer 5.
Optionally, the preparation method of the polyurethane concrete comprises the following steps:
s110, pouring the material A into a dispersing machine, and then pouring the material B into the material A for uniform dispersion. (the once dispersing amount is reasonably determined according to the gelation time and the construction capability of the binder, so that the waste is avoided).
S120, pouring the dispersed binder into a stirring tank filled with stone according to the mass ratio of 1:4, stirring uniformly, and pouring in time. The stone adopts basalt with the grain diameter of 3mm and 5mm, and the mass ratio is 1:2.
In the embodiment, the water content of the raw materials is strictly controlled, the material A is less than or equal to 0.1 percent, and the stone is less than or equal to 0.2 percent. Temperature control of raw materials: the temperature of the material A is as follows: 29 to 33 ℃, the stone temperature is: 17 to 20 ℃, the temperature of the material B is: 20-30 ℃. Considering that segregation imagination occurs in the long-time transportation and storage process of the material A, a dispersing machine is adopted before the material A is used, and the material A is uniformly dispersed and is kept for 2 to 4 hours for later use.
In the preparation method of the polyurethane composite material and the polyurethane concrete, the material A comprises polytetrahydrofuran prepolymer, polyether polyol and other auxiliary materials, and the material B comprises isocyanate.
The construction process of the assembled tension-free expansion device on the bridge comprises the following steps:
1. the choice of elastomer 5 and the width of the notch are determined: combining the maximum span of the bridge and the bridge split hole joint length, determining the width of the notch, the parameters of the elastomer 5, the precompression amount of construction and the like according to an expansion joint construction parameter table, wherein the expansion joint construction parameter table can be shown in the following table 1:
TABLE 1
And for replacing the old bridge expansion joint project, grooving according to the determined notch width. Note that during grooving, the beam body 10 is prevented from being damaged, loose concrete, sundries and floating dust in the groove opening are removed, for example, polyurethane concrete is used as the first leveling cushion layer 3 and the second leveling cushion layer 4, construction is strictly performed according to the polyurethane concrete technology, and the groove opening is strictly forbidden to be cleaned by water; and (3) reserving the notch of the expansion joint according to the design file for the newly-built project.
2. Installing the filling body 7: after the beam ends are coated with adhesive, the filling body 7 is forcedly embedded into the expansion joint 14 between the two adjacent beam bodies 10.
3. Drilling and bar planting: drilling holes and planting bars on the beam body 10 according to a design drawing, wherein the bar planting process is executed according to the corresponding requirements of the technical Specification for reinforcing construction of highway bridges.
4. Binding and welding a reinforcement bar 15 framework: the binding and welding process of the reinforcing steel bars 15 is required to be carried out according to the corresponding clauses of the technical Specification for construction of highway bridges.
5. Pouring a first leveling cushion layer 3 and a second leveling cushion layer 4: if the first leveling cushion layer 3 and the second leveling cushion layer 4 adopt cement concrete, the strength grade of the concrete is C50, and the construction and maintenance are carried out according to the corresponding clauses of the highway bridge construction technical Specification; if the construction period is short, polyurethane concrete is adopted for the first leveling cushion layer 3 and the second leveling cushion layer 4, the notch is dehumidified before binding and welding the reinforcement bar 15 framework, and then a bonding material with the thickness of 1mm to 2mm is coated. Then, the first leveling blanket 3 and the second leveling blanket 4 are constructed.
6. Installing a joint-crossing plate 6: the upper surfaces of the first leveling cushion layer 3 and the second leveling cushion layer 4 and the bottom surfaces of the seam crossing plates 6 are coated with 1mm to 2mm of bonding materials, the coating is required to be uniformly carried out without dead angles, the seam crossing plates 6 are timely installed, the seam crossing plates 6 are flattened during installation, and phenomena of void, uneven and the like are avoided.
7. Pouring a first anchoring block 1: before pouring, the bonding layers on the upper surfaces of the first leveling cushion layer 3 and the second leveling cushion layer 4 are preheated by an air heater, then the first anchoring block 1 is poured, and a flat vibrator is adopted for vibrating until the bonding layers are compact. Then, under the normal temperature condition, covering and curing by using a waterproof heat-preserving mold, and removing the curing mold after 4 hours.
8. Installing an anchor bolt sleeve 8: the second leveling blanket 4 and the corresponding beam body 10 are drilled and implanted with an anchor bolt sleeve 8 having an internal screw opening.
9. Installing an elastic body 5 and a second anchoring block 2: when the colloid strength reaches more than 40Mpa, coating adhesive materials on the inner side surface of the first anchoring block 1 and the side surface of the elastic body 5, pre-installing the second anchoring block 2 and the elastic body 5 according to a preset inclination angle, screwing the bolt 9 after the second anchoring block is in place, applying vertical pressure, and pressing the elastic body 5 and the second anchoring block 2 to the horizontal position.
10. Filling the joint: and removing the temporary plate 21 for temporary construction of the second anchoring block 2, and pouring seams by adopting a polyurethane concrete binder, wherein the seams between the second anchoring block 2 and the bridge deck and the seams between the second anchoring block 2 are subjected to pouring seams, and the seams between the elastic bodies 5 are subjected to pouring seams by adopting a polyurethane interface binder.
In this embodiment, for the inclined bridge, the middle portion may be directly mounted by using the 2m length elastic body 5, the cutting angle of the two end adjusting blocks is determined according to the bevel angle, the minimum dimension of the adjusting blocks in the length direction must not be lower than 500mm, and the adjusting speed may be obtained by cutting the second anchoring block 2 and the elastic body 5 on site.
The reader will appreciate that in the description of this specification, a description of terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (10)
1. The assembled tension-free telescopic device is used for being arranged at an expansion joint (14) between two adjacent beam bodies (10) and is characterized by comprising a first anchoring block (1), a second anchoring block (2), an elastic body (5), an anchor bolt sleeve (8) and a bolt (9), wherein the anchor bolt sleeve (8) penetrates through the beam bodies (10), the first anchoring block (1) and the second anchoring block (2) are respectively arranged on the two adjacent beam bodies (10), the elastic body (5) is made of a polyurethane composite material, the elastic body (5) is arranged between the first anchoring block (1) and the second anchoring block (2) and is in a compressed state, and the elastic body (5) is used for covering the expansion joint (14);
the second anchor block (2) is prefabricated, the second anchor block (2) comprises a temporary plate (21), an embedded plate (22), a prefabricated anchor block (23) and an embedded bolt fixing plate (24), the temporary plate (21) is provided with a plurality of first waist-shaped holes (211) along the width direction of the bridge, the embedded plate (22) is provided with a plurality of openings along the width direction of the bridge, the embedded bolt fixing plate (24) is arranged in one-to-one correspondence with the openings, the embedded bolt fixing plate (24) is provided with at least two third hole structures (241), the prefabricated anchor block (23) is provided with second waist-shaped holes (231) along the width direction of the bridge, when the second anchor block (2) is not fixed, the upper end and the lower end of the prefabricated anchor block (23) are respectively connected with the temporary plate (21) and the embedded plate (22), at this time, the first waist-shaped holes (211), the second waist-shaped holes (231) are aligned with the openings, the second waist-shaped holes (24) penetrate through the second anchor block (211) and the second waist-shaped holes (21) to be connected with the second anchor block (8) after the second anchor block (23) is fixed by the threaded sleeve (8) and the second anchor block (2) is fixed by the threaded sleeve (8), then plugging the second waist-shaped hole (231) by polyurethane concrete;
the elastic body (5) and the second anchoring block (2) are respectively provided with a matched clamping groove (52) and a clamping block (221), when the elastic body (5) is installed, the elastic body (5) and the second anchoring block (2) are inclined at a certain angle respectively, vertical pressure is applied to the second anchoring block (2), and under the action of the clamping block (221) and the clamping groove (52), the second anchoring block (2) can drive the elastic body (5) to gradually change into a horizontal state until the elastic body (5) is pressed into the horizontal state.
2. The assembled tension-free telescopic device according to claim 1, further comprising a filler (7), the filler (7) being arranged in the expansion joint (14).
3. The assembled tension-free telescopic device according to claim 1, further comprising a first leveling pad layer (3) and a second leveling pad layer (4), wherein the first leveling pad layer (3) and the second leveling pad layer (4) are respectively arranged on two adjacent beam bodies (10), the first anchoring block (1) and the second anchoring block (2) are respectively arranged above the first leveling pad layer (3) and the second leveling pad layer (4), and the elastic body (5) is supported on the first leveling pad layer (3) and the second leveling pad layer (4).
4. A fabricated tension-free telescoping device as claimed in claim 3, further comprising a slit plate (6), the slit plate (6) being located below the elastic body (5), two ends of the slit plate (6) being supported on the first leveling pad layer (3) and the second leveling pad layer (4) respectively, the slit plate (6) being configured to cover the expansion joint (14).
5. The assembled tension-free telescopic device according to claim 3, wherein the first anchoring block (1) is cast on the first leveling cushion layer (3) in a cast-in-place mode, the material of the first anchoring block (1) comprises polyurethane concrete, the compressive strength of the first anchoring block (1) is greater than 60MPa, and the flexural strength of the first anchoring block (1) is greater than 25MPa.
6. A fabricated tension-free telescopic device according to claim 3, wherein the anchor bolt sleeve (8) is threaded through the second leveling blanket (4).
7. A fabricated tension-free telescopic device according to claim 3, wherein the first leveling pad layer (3) and the first anchor block (1) are connected to the beam body (10) by anchor bars (15), respectively.
8. The assembled tension-free telescopic device according to claim 1, wherein the bending strain of the elastomer (5) at 30 degrees below zero is greater than 10000 μ.
9. The assembled tension-free telescopic device according to claim 1, wherein an adhesive layer is provided between the first anchor block (1) and the elastic body (5) and between the second anchor block (2) and the elastic body (5), respectively.
10. The assembled tension-free telescopic device according to claim 1, wherein the polyurethane composite material comprises a material A and a material B, and the preparation method of the elastomer (5) comprises the following steps:
preheating the material A to 80 ℃, and vacuumizing under the condition of 0.95 of vacuum degree;
preheating the material B to 113-115 ℃ and vacuumizing under the condition of 0.95 of vacuum degree;
preheating the template to 110 ℃, uniformly dispersing the material A and the material B at 80-90 ℃,
pouring the dispersed material A and the dispersed material B into a test piece at the temperature of 110-115 ℃;
vulcanizing the test piece at 120 ℃ for 1 to 1.5 hours, removing the template, and vulcanizing the test piece at 120 ℃ for 8 to 12 hours;
and cooling the post-vulcanized test piece to normal temperature to form the elastomer (5).
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| CN202310067154.1A CN115961545B (en) | 2023-01-16 | 2023-01-16 | Assembled no pulling force telescoping device |
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| CN202310067154.1A CN115961545B (en) | 2023-01-16 | 2023-01-16 | Assembled no pulling force telescoping device |
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| CN115961545B true CN115961545B (en) | 2023-08-18 |
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