CN110158660B - Construction method of well cover of tunnel center inspection well suitable for heavy traffic rolling - Google Patents
Construction method of well cover of tunnel center inspection well suitable for heavy traffic rolling Download PDFInfo
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- CN110158660B CN110158660B CN201910502641.XA CN201910502641A CN110158660B CN 110158660 B CN110158660 B CN 110158660B CN 201910502641 A CN201910502641 A CN 201910502641A CN 110158660 B CN110158660 B CN 110158660B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
Abstract
The invention provides a construction method of a well cover of a tunnel center inspection well, which is suitable for heavy traffic rolling, and comprises the following steps: firstly, prefabricating a cover plate; secondly, chiseling cover plate grooves towards the periphery of the inspection well by taking the middle point of the inspection well as the center; leveling the bottom of the cover plate groove by using mortar, and burying the metal bearing piece when the mortar is not solidified; placing a rubber pad on the metal bearing piece, and then placing the cover plate prefabricated in the first step into the cover plate groove in the second step to enable the surface of the rubber pad to be in contact with the bottom surface of the cover plate; and step five, filling a material layer in the gap between the cover plate and the pavement panel. According to the invention, the channel steel is paved under the cover plate, so that the bearing capacity is improved; the rubber pad is arranged under the cover plate, so that the automobile cover plate is suitable for dynamic load of an automobile. The metal bearing piece is buried under the condition that the mortar leveling layer is not solidified, so that the mortar leveling layer and the metal bearing piece are fully wrapped and clamped to form common bearing capacity.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a construction method of a well cover of a central inspection well of a tunnel, which is suitable for heavy traffic rolling.
Background
For a long time, the central inspection well of the highway tunnel is customarily provided with a concrete prefabricated cover plate, and the construction technology is relatively simple. However, after the vehicle is opened for a period of time, under repeated impact of heavy vehicles, the phenomena of peeling, cracking and sinking of corners can occur, normal road traffic is seriously affected, and great potential safety hazards exist.
Based on this, it is urgently needed to provide a well lid structure of a tunnel center inspection well suitable for heavy traffic rolling, and the problem that the well lid structure is easy to damage in the early stage in the prior art is solved.
Disclosure of Invention
The invention provides a construction method of a well cover of a tunnel center inspection well suitable for heavy traffic rolling, which is characterized in that channel steel is paved below a cover plate, and a rubber pad is arranged between the channel steel and the cover plate, so that the bearing capacity is improved, and the well cover is suitable for dynamic load of an automobile.
The technical scheme for realizing the purpose of the invention is as follows:
a construction method of a well cover of a tunnel center inspection well applicable to heavy traffic rolling comprises the following steps:
firstly, prefabricating a cover plate;
secondly, chiseling cover plate grooves towards the periphery of the inspection well by taking the middle point of the inspection well as the center;
leveling the bottom of the cover plate groove by using mortar, and burying the metal bearing piece when the mortar is not solidified;
placing a rubber pad on the metal bearing piece, and then placing the cover plate prefabricated in the step one in the cover plate groove in the step two to enable the surface of the rubber pad to be in contact with the bottom surface of the cover plate;
and step five, filling a material layer in a gap between the cover plate and the cover plate groove.
According to the invention, the channel steel is paved under the cover plate, so that the bearing capacity is improved; the rubber pad is arranged under the cover plate, so that the automobile cover plate is suitable for dynamic load of an automobile. The metal bearing piece is buried under the condition that the mortar leveling layer is not solidified, so that the mortar leveling layer and the metal bearing piece are fully wrapped, and the bearing capacity of the mortar leveling layer is improved through the metal bearing piece.
As a further improvement of the invention, in the first step, the concrete grade selected by the prefabricated cover plate is higher than the concrete grade required by the design file, and the thickness of the prefabricated cover plate is greater than the thickness required by the design file.
In the original design, the thickness of the cover plate is 20cm, the concrete label is C25, in order to prevent the cover plate from sinking, falling corners and other diseases after the tunnel is communicated, the thickness of the cover plate is increased to 25cm, the label of the concrete of the cover plate is increased to C40, and the rigidity of the well cover is improved by increasing the thickness of the cover plate and increasing the label of the concrete.
As a further improvement of the invention, in the second step, both the length and the width of the cover plate groove are greater than those required by the design file;
the size of the cover plate groove is matched with that of the cover plate;
and in the first step, the length and the width of the prefabricated cover plate are both larger than those required by the design file.
The diameter of the manhole cover plate in the original design center is 58cm, the groove width and the groove length of the cover plate groove are both larger than 135cm, and the impact resistance of the cover plate is improved by increasing the area of the cover plate.
As a further improvement of the present invention, the thickness of the mortar in the third step is slightly larger than that of the metal bearing piece.
As a further improvement of the invention, the metal bearing parts are a plurality of channel steels and are uniformly distributed perpendicular to the driving direction.
The plurality of channel steels are uniformly distributed perpendicular to the driving direction, and can bear the load transmitted when a vehicle passes through the cover plate.
As a further improvement of the invention, the notch of the channel steel faces downwards and is buried in the mortar leveling layer.
The channel steel is a strip steel with a groove-shaped section, a notch of the channel steel faces the bottom of the cover plate groove and is buried in the cement mortar layer, and the groove of the channel steel is filled with cement mortar; the web and the pterygoid lamina atress simultaneously of channel-section steel when the vehicle passes through the apron, the web bears the vehicle to the vertical effort of apron, and the pterygoid lamina bears the vehicle to apron along the thrust of direction of advance, and the cement mortar of filling in the channel-section steel recess restricts the channel-section steel and takes place the displacement along the direction of advance, makes many channel-section steels permanent use still evenly distributed, can not take place the displacement.
As a further improvement of the invention, at least one channel steel is buried in the mortar leveling layer across the inspection well.
The steel material crosses the inspection well and is buried in the cement mortar layer, so that the suspension of the position of the inspection well after the cover plate is placed in the cover plate groove is avoided, the bearing capacity of the cover plate groove on the cover plate is improved, and the service life of the cover plate is prolonged.
As a further improvement of the invention, the thickness of the rubber pad in the fourth step is about 1 cm.
In the fifth step, mortar is firstly used for pointing the lower half part of the gap, and then asphalt is used for potting the upper half part of the gap.
In the invention, the length of the channel steel is preferably equal to the length or the width of the cover plate groove, specifically, the size of the cover plate groove is 135 multiplied by 35cm, the size of the prefabricated cover plate is 130 multiplied by 25cm, the groove is leveled by 9 cm mortar, 6 channel steel of 135cm are uniformly distributed in the direction perpendicular to the driving direction, the purpose of selecting the channel steel is that the mortar and the channel steel are fully wrapped, and in addition, the channel steel has strong bending resistance. The notch of the channel steel is buried in the mortar layer, and the height of the top of the channel steel is controlled to be 26 cm away from the surface of the pavement; a rubber cushion layer with the thickness of 1cm is laid on the channel steel, a concrete cover plate with the thickness of 130 multiplied by 25cm is hoisted on the rubber cushion layer, the lower half part of a gap between the cover plate and a pavement panel is subjected to mortar pointing with the thickness of 10 cm, and the upper half part is subjected to asphalt encapsulation with the thickness of 15 cm; and finally, polishing and leveling the cover plate and carving the anti-slip grooves to keep consistent with the peripheral road surface.
As a further improvement of the invention, the method also comprises a sixth step of polishing, leveling and carving the antiskid grooves on the cover plate after the fifth step, so that the surface of the cover plate is consistent with the peripheral road surface.
As a further improvement of the invention, the surface of each cover plate is provided with 4 embedded bolts for hoisting the cover plate. The pre-buried bolt is only used for lifting the cover plate during maintenance and repair of the ditch, and is plugged by asphalt daily.
Compared with the prior art, the invention has the beneficial effects that:
1. the well cover installed by the construction method has higher bearing capacity.
2. The invention fills asphalt between the well cover and the road surface for encapsulation, and can bear the impact force generated by the running of the automobile.
Drawings
FIG. 1 is a flow chart of a well lid construction method;
FIG. 2 is a schematic view of a well lid structure;
FIG. 3 is a top view of the cover plate;
FIG. 4 is a front view of the cover plate;
FIG. 5 is a schematic view of the construction of the deck slot;
FIG. 6 is a schematic structural diagram of a channel steel, a mortar leveling layer and an inspection well;
FIG. 7 is a sectional view A-A of FIG. 6;
fig. 8 is a design drawing of an original well lid.
In the figure, 100, a mortar leveling layer; 200. a rubber pad; 300. a cover plate; 400. a mortar pointing layer; 500. an asphalt potting layer; 600. embedding a bolt in advance; 700. channel steel; 1. a pavement panel; 2. a cover plate groove; 3. an inspection well; a. a well cover is provided.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
a certain highway tunnel is of a separated type, the driving speed is 80 kilometers per hour, the lengths of a left hole and a right hole are 11200 meters, the net height is 5 meters, and the net width is 10.25 meters. The design drawing of the well cover of the tunnel central inspection well is shown in fig. 8, and as can be seen from fig. 8, the original design cover plate 300 is thinner (with the thickness of 20 cm) and the concrete label is lower (C25), and the bottom holding force part of the cover plate 300 is not specially processed; meanwhile, the gap between the cover plate 300 and the concrete pavement panel is filled with common mortar without special treatment. According to the design construction shown in fig. 7, after the tunnel is opened for 3-5 months, under repeated impact of heavy vehicles, the cover plate 300 can generate phenomena of peeling, cracking and sinking of corners, which seriously affects normal traffic of roads and has great potential safety hazard.
Based on this, this embodiment provides a well lid's work progress as follows: (1) prefabricating and processing a C40 reinforced concrete cover plate 300 with the thickness of 130 multiplied by 25 cm; (2) taking the midpoint of the inspection well as the center, chiseling a 135 multiplied by 35cm cover plate groove 2, and removing construction waste in the inspection well; (3) the cover plate groove 2 is leveled by 9 cm of mortar, and then 6U 16 channel steel 700 (the channel steel 700 is buried under the condition that the mortar leveling layer 100 is not solidified) with the thickness of 135cm are uniformly distributed in the direction vertical to the driving direction, the channel steel 700 is selected for fully wrapping the mortar and the channel steel 700, and the channel steel 700 has strong bending resistance; (4) the notch of the channel steel 700 is downward and buried in the mortar leveling layer 100, and the top elevation of the channel steel 700 is controlled to be 26 cm away from the road surface; (5) a rubber pad layer 200 with the thickness of 1cm is laid on the channel steel 700, and a concrete cover plate 300 with the thickness of 130 multiplied by 25cm is hoisted on the rubber pad layer 200; (6) mortar is pointing at the lower half part of the gap between the cover plate 300 and the pavement panel by 10 cm, and asphalt is encapsulated at the upper half part by 15 cm; (7) the cover plate 300 is polished, leveled and engraved with anti-slip grooves to keep consistent with the surrounding road surface.
The cover plate structure of the embodiment has no diseases such as sinking, corner falling and the like, and ensures smooth road and driving safety.
Example 2:
as shown in fig. 1, the construction method of the manhole cover of the central inspection well of the tunnel suitable for heavy traffic rolling comprises the following steps:
step one, prefabricating a cover plate 300;
step two, chiseling a position of a cover plate groove 2 towards the periphery of the inspection well by taking the middle point of the inspection well as the center;
leveling the bottom of the cover plate groove 2 by using mortar, and burying the metal bearing piece when the mortar is not solidified; the thickness of the mortar in the third step is slightly larger than that of the metal bearing piece.
Step four, placing the rubber gasket 200 on the metal bearing piece, and then placing the cover plate 300 prefabricated in the step one into the cover plate groove 2 in the step two to enable the surface of the rubber gasket 200 to be in contact with the bottom surface of the cover plate 300;
step five, filling a material layer in a gap between the cover plate 300 and the cover plate groove 2 (namely, the pavement panel);
and step six, polishing and leveling the cover plate 300 and carving anti-slip grooves to enable the surface of the cover plate 300 to be consistent with the peripheral road surface.
In the fourth step, the thickness of the rubber pad 200 is about 1 cm. And fifthly, pointing the lower half part of the gap by using mortar, and then embedding the upper half part of the gap by using asphalt.
In the embodiment, the channel steel 700 is paved under the cover plate 300, so that the bearing capacity is improved; in this embodiment, the rubber pad 200 is installed under the cover plate 300 to adapt to the dynamic load of the automobile. In the embodiment, the metal bearing part is buried under the condition that the mortar leveling layer 100 is not solidified, so that the mortar leveling layer 100 and the metal bearing part are fully wrapped, and the bearing capacity of the mortar leveling layer 100 is improved through the metal bearing part.
In the original design, the thickness of the cover plate 300 is 20cm, the concrete label is C25, in order to prevent the damage of the tunnel through the vehicle rear cover plate 300, the thickness of the cover plate 300 is increased to 25cm, the concrete label of the prefabricated cover plate 300 is increased to C40, and the rigidity of the well cover is improved by increasing the thickness of the cover plate 300 and increasing the concrete label. Preferably, in the first step, the concrete grade of the prefabricated cover plate 300 is higher than that of the design file, and the thickness of the prefabricated cover plate 300 is greater than that of the design file.
The diameter of the inspection well in the original design center is 58cm, the groove width and the groove length of the cover plate groove 2 are both larger than 135cm, and the impact resistance is improved by increasing the area of the cover plate 300. In the second step, the length and the width of the cover plate groove 2 are both larger than those required by the design file; the size of the cover plate groove 2 is matched with that of the cover plate 300; in step one, the length and width of the prefabricated cover plate 300 are both larger than those required by the design file.
Many channel-section steels 700 of this embodiment perpendicular to driving direction evenly distributed, the load of transmission when can the dispersion vehicle passes through apron 300 avoids single channel-section steel 700 atress, causes stress concentration. The metal bearing parts are a plurality of channel steel 700 which are perpendicular to the travelling direction and are uniformly distributed.
The channel 700 is a long steel bar with a groove-shaped cross section, and after the channel 700 is buried in the mortar leveling layer 100, the groove of the channel 700 is filled with cement mortar; when the vehicle passes through apron 300 time slot steel 700's web and pterygoid lamina atress simultaneously, the web bears the vehicle to the vertical effort of apron 300, and the pterygoid lamina bears the vehicle to the thrust that apron 300 produced along the direction of travel, and the cement mortar of filling in channel-section steel 700 recess restricts channel-section steel 700 and takes place the displacement along the direction of travel, makes many channel-section steels 700 use still evenly distributed for a long time, can not take place the displacement. The channel 700 is notched down and embedded in the screed 100.
The at least one steel of this embodiment spans the inspection shaft and buries in mortar screed-layer 100, avoids apron 300 to place the inspection shaft position after apron groove 2 unsettled, improves apron groove 2 and to the bearing capacity of apron 300, extension apron 300 life.
Example 3:
the traditional manhole cover of the central inspection well of the highway tunnel has the defects of low mark number, thin thickness and suspended substrate, and obviously insufficient bearing capacity; in addition, mortar is filled in gaps between the traditional well cover and the concrete pavement, and is continuously loosened and hollowed under the repeated action of dynamic load of an automobile, so that the whole well cover sinks or is damaged, and the driving safety is endangered.
The design concept of the embodiment is as follows: firstly, the thickness of the cover plate 300 is increased, the grade of concrete is improved, and the rigidity of the cover plate is improved; secondly, paving channel steel 700 below the cover plate 300 to improve the bearing capacity; thirdly, a rubber pad 200 is arranged below the cover plate 300 to adapt to the dynamic load of the automobile; and fourthly, filling asphalt between the well cover and the gap of the concrete pavement panel to adapt to flexible extrusion generated by automobile running.
As shown in fig. 2-7, the manhole cover structure of the present embodiment includes a cover plate 300 and a rubber pad 200, the cover plate 300 and the rubber pad 200 are both larger than the inspection well, and a cover plate groove 2 is formed by cutting around the inspection well with the center line of the inspection well as the groove depth of the cover plate groove 2 is less than 50 cm; the cover plate 300 and the rubber pad 200 are embedded in the cover plate groove 2; the rubber pad 200 covers the wellhead of the inspection well, and the cover plate 300 is pressed on the surface of the rubber pad 200; the cover plate 300 has a gap with the pavement panel, and the gap is filled with a filling material, and the filling material forms a filling layer in the gap.
In the embodiment, the cover plate groove 2 is formed by cutting around the center line of the inspection well, the cover plate 300 is placed in the cover plate groove 2, and the cover plate 300 is supported by the groove bottom plane of the cover plate groove 2, so that the impact resistance of the cover plate 300 is better due to the groove bottom supporting function of the cover plate groove 2 in the embodiment compared with the conventional mode of directly placing the cover plate 300 on the inspection well. In the embodiment, the rubber pad 200 is arranged below the cover plate 300 to adapt to the dynamic load of the automobile, and in addition, the rubber pad 200 can buffer the acting force of the automobile on the cover plate 300 by rolling the cover plate 300 during the running of the automobile, and the impact of the automobile on the cover plate 300 is weakened to a certain extent. Compared with the traditional mode, the embodiment increases the contact area between the rubber pad 200 and the cover plate 300 by adding the rubber pad 200 to cover the wellhead of the inspection well, and the cover plate 300 has better impact resistance.
In this embodiment, the lower half part of the gap between the cover plate 300 and the pavement panel is 10 cm in mortar pointing, and the upper half part is 15 cm in asphalt filling. The mortar pointing has higher strength and provides good support for asphalt encapsulation; the asphalt material has better viscosity and ductility and strong deformation resistance. Therefore, the preferred filling layer is composed of mortar jointing layer 400 and asphalt sealing layer 500, wherein mortar jointing layer 400 is close to the bottom of the gap, and asphalt sealing layer 500 is close to the top of the gap.
It is preferable that the surface of the asphalt potting layer 500 is in the same plane as the surface of the cap plate 300. The surface of the cover plate 300 is in the same plane with the surrounding road surface. In this embodiment, the surface of the asphalt potting layer 500 and the surface of the cover plate 300 are in the same plane, so that the flatness of the whole road surface is improved. In this embodiment, the cover plate 300 is polished to be flat, so that the surface of the cover plate 300 is consistent with the peripheral road surface, and the flatness of the whole road surface is improved.
Example 4:
after a road with the manhole cover structure is driven, tires of the vehicle are in contact with the surface of the cover plate 300 during driving, so that the surface of the cover plate 300 needs to have certain skid resistance. At present, the conventional way for improving the skid resistance of the road surface is to arrange textures on the road surface, and the textures can increase the friction force between a vehicle and the road surface, so that the driving safety of the vehicle is ensured.
On the basis of the solution disclosed in embodiment 3, it is preferable that the surface of the cover plate 300 is provided with a plurality of anti-slip grooves. The purpose of the present embodiment is to provide anti-slip grooves on the surface of the cover plate 300 to increase the friction force on the surface of the cover plate 300. The construction process for arranging the anti-skid grooves comprises a grooving method and a grooving method, wherein the grooving method has durability, but when the road surface becomes wet, a water film is formed when a vehicle runs on the road surface, so that the surface of the cover plate 300 becomes smooth due to disappearance of the anti-skid grooves, and the vehicle runs with a certain degree of harm; the grooving method is less influenced by factors such as temperature, wind speed and the like, and the skid resistance is not greatly reduced due to the wet pavement. Therefore, the present embodiment adopts the grooving method to form the anti-slip groove on the surface of the cover plate 300.
If the groove bottom is uneven, the basic requirement of the installation of the cover plate 300 cannot be met, and the cover plate 300 is installed forcibly, so that the situation of air holes and shaking can occur, and the abrasion of the cover plate 300 is increased. In order to keep the bottom of the deck plate trough 2 flat and smooth, the bottom of the deck plate trough 2 is provided with a mortar screed 100. In this embodiment, the mortar leveling layer 100 is disposed at the bottom of the cover plate groove 2, and the mortar leveling layer 100 enables the rubber pad 200 and the cover plate 300 to perform better functions.
The manhole cover structure of the embodiment comprises a cover plate 300, a rubber pad 200 and a plurality of steel materials, wherein the sizes of the cover plate 300 and the rubber pad 200 are larger than that of an inspection well, a cover plate groove 2 is formed by cutting the periphery of the inspection well by taking the center line of the inspection well as the center, and the groove depth of the cover plate groove 2 is less than 50 cm; the cover plate 300 and the rubber pad 200 are embedded in the cover plate groove 2; the rubber pad 200 covers the wellhead of the inspection well, and the cover plate 300 is pressed on the surface of the rubber pad 200; the cover plate 300 has a gap with the pavement panel, and the gap is filled with a filling material, and the filling material forms a filling layer in the gap.
The bottom of the cover plate groove 2 is provided with a mortar leveling layer 100, a plurality of steel materials are buried in the mortar leveling layer 100, the surface of the steel materials is flush with the surface of the mortar leveling layer 100, and the surface of the steel materials is in contact with the rubber pad 200. The embodiment buries many steel of putting down in mortar screed-coat 100, improves the bearing capacity of well lid structure, and the surface parallel and level of steel and mortar screed-coat 100's surface increase rubber pad 200 and steel surface, the area of contact between the mortar screed-coat 100.
The steel materials are distributed perpendicular to the travelling direction. Many steel of this embodiment are perpendicular to the traffic direction and distribute, and the vertical load that forms when can the dispersion vehicle passes through apron 300 avoids single steel atress, causes stress concentration.
The steel is a channel 700, and the notch of the channel 700 faces downwards and is buried in the mortar screed 100. The channel 700 is a long steel bar with a groove-shaped cross section, the channel 700 is buried in the mortar leveling layer 100, and the groove of the channel 700 is filled with cement mortar; when the vehicle passes through apron 300 time slot steel 700's web and pterygoid lamina atress simultaneously, the web bears the vertical effort of vehicle, and the pterygoid lamina bears the vehicle along the thrust that the direction of travel produced, and the cement mortar of filling in channel-section steel 700 recess restricts channel-section steel 700 along the direction of travel and takes place the displacement, makes many channel-section steels 700 use still evenly distributed for a long time, can not take place the displacement.
At least one steel material in the plurality of steel materials is buried in the mortar leveling layer 100 across the inspection well. At least one steel of this embodiment crosses the inspection shaft and buries in cement screed-coat 100, avoids apron 300 to place behind apron groove 2 that the inspection shaft is located the position unsettled, improves apron groove 2 to the bearing capacity of apron 300, extension apron 300 life.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A construction method for a well cover of a tunnel center inspection well applicable to heavy traffic rolling is characterized by comprising the following steps:
the method comprises the following steps that firstly, a cover plate is prefabricated, the number of concrete marks selected for the prefabricated cover plate is higher than that of concrete marks required by a design file, and the thickness of the prefabricated cover plate is larger than that of the prefabricated cover plate required by the design file, so that the rigidity of the prefabricated cover plate is improved;
secondly, chiseling cover plate grooves towards the periphery of the inspection well by taking the middle point of the inspection well as the center;
leveling the bottom of the cover plate groove by using mortar, burying a metal bearing piece when the mortar is not solidified, wherein the metal bearing piece is a plurality of channel steel, and the channel steel is uniformly distributed in a direction perpendicular to the travelling direction so as to jointly bear the load transmitted when a vehicle passes through the cover plate; the notch of the channel steel faces downwards and is buried in the mortar leveling layer;
placing a rubber pad on the metal bearing piece to adapt to the dynamic load of the automobile, and then placing the cover plate prefabricated in the step one in the cover plate groove in the step two to enable the surface of the rubber pad to be in contact with the bottom surface of the cover plate;
filling a material layer in a gap between the cover plate and the cover plate groove; the filling material layer is filled in the gap, and specifically comprises: the mortar is firstly used for pointing at the lower half part of the gap, then the asphalt is used for encapsulating at the upper half part of the gap, the asphalt is filled in the upper half part of the gap between the well cover and the concrete pavement panel, and the mortar is filled in the lower half part of the gap between the well cover and the concrete pavement panel, so that the mortar is suitable for flexible extrusion generated by automobile running and has higher strength.
2. The construction method of the well cover of the tunnel center inspection well, according to the claim 1, is characterized in that the length and the width of the cover plate groove in the second step are both larger than the length and the width required by the design file;
the size of the cover plate groove is matched with that of the cover plate;
and in the first step, the length and the width of the prefabricated cover plate are both larger than those required by the design file.
3. The method for constructing the manhole cover of the tunnel center according to claim 1, wherein the mortar has a thickness slightly greater than that of the metal bearing member in the third step.
4. The method of claim 1, wherein at least one channel spans the manhole and is embedded in a screed.
5. The construction method of the well cover of the inspection well in the center of the tunnel according to claim 1, wherein the thickness of the rubber mat in the fourth step is about 1 cm.
6. The method for constructing the well lid of the tunnel center inspection well according to any one of claims 1 to 5, further comprising a sixth step of polishing and leveling the cover plate and carving anti-slip grooves after the fifth step so that the surface of the cover plate is consistent with the peripheral pavement.
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| CN201910502641.XA CN110158660B (en) | 2019-06-11 | 2019-06-11 | Construction method of well cover of tunnel center inspection well suitable for heavy traffic rolling |
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| CN201910502641.XA CN110158660B (en) | 2019-06-11 | 2019-06-11 | Construction method of well cover of tunnel center inspection well suitable for heavy traffic rolling |
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| CN206873498U (en) * | 2017-04-10 | 2018-01-12 | 康东星 | A kind of double-layer shock-absorbing well lid |
| CN207109871U (en) * | 2017-07-31 | 2018-03-16 | 山东星通电讯科技股份有限公司 | A kind of resistance to compression well lid |
| CN208733677U (en) * | 2018-04-28 | 2019-04-12 | 全度环保（武汉）有限公司 | A kind of Safety well cover |
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2019
- 2019-06-11 CN CN201910502641.XA patent/CN110158660B/en active Active
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