CN221608641U - Round pipe culvert basement layer structure - Google Patents

Abstract

The utility model provides a round pipe culvert base cushion layer structure, which relates to the technical field of culvert engineering construction and comprises the following components: cushion layers and round pipe culverts are sequentially arranged from bottom to top; the end part of the round pipe culvert body is a hole; the round pipe culvert body comprises: the round pipe culvert foundation and the pipe joint are sequentially arranged from bottom to top, and the top of the round pipe culvert foundation is an arc surface and is tightly attached to the pipe joint; the cushion layer is paved by adopting original road milling materials and/or stone slag or cement soil. The round pipe culvert substrate cushion layer has simple and reasonable structure and strong integrity, improves the structural strength and stability of the round pipe culvert substrate, reduces the occurrence of damage, simplifies the process and reduces the cost; the original pavement milling material can be used for cushion construction, so that the cost and the masonry quantity of constructors are saved, the construction efficiency is improved, the construction is simple, the emission of construction waste is reduced, the pollution is reduced, and the environment is protected.

Description

Round pipe culvert basement layer structure

Technical Field

The utility model relates to the technical field of culvert engineering construction, in particular to a round pipe culvert base cushion layer structure.

Background

The culvert pipe is widely used in water conservancy, highway, railway, municipal works, according to the observation, investigation and understanding to the engineering, current pipe culvert increases along with the time, can appear multiple harm because of the influence of multiple factor, and some can local deformation or appear the destruction condition.

Most concrete culverts have various diseases with different degrees after being used for 3 months to 2 years, and particularly in soft soil areas or uneven foundation subsidence areas, the damage phenomenon of the culverts is more serious, and the damage phenomenon is mainly represented by cracking of a pipe body and dislocation among pipe sections caused by uneven subsidence.

At present, for the defect of structural deformation, the post-reinforcing or repairing is needed to maintain normal use, and the existing culvert reinforcement is generally carried out by the following method:

The thick steel plate or the support frame is arranged on the inner side of the culvert, the deformation gap is cast in situ, the integral bearing capacity of the reinforcing surface is improved, but the on-site reinforcing operation and processing technology is complex, the construction space is narrow, the construction difficulty is high, the cost is high, and finally, the construction efficiency of repair work is low and the construction period is long; the reinforcement effect on the overall structure of the culvert is limited.

Disclosure of utility model

In view of this, the present utility model aims at designing a round pipe culvert base bedding structure, improving the bearing and pressure resistance capacity of the round pipe culvert base, improving the stability of the structure under environmental changes (including water resistance), reducing the occurrence of damage, simplifying the process, and adopting the original road milling material for bedding construction, so as to reduce the emission of construction waste and reduce the cost.

The utility model provides a round pipe culvert base cushion layer structure, which comprises: cushion layers and round pipe culverts are sequentially arranged from bottom to top; the end part of the round pipe culvert body is an opening;

The round pipe culvert body comprises: the pipe joint is tightly attached to the round pipe culvert foundation, and the top of the round pipe culvert foundation is an arc surface;

the cushion layer adopts original road milling materials and/or stone residues or cement soil.

The original pavement milling material is the water-stable stone mixture scraped by the milling machine for the original damaged cement-stable broken stone pavement, and the milling material is used as the material backfill of the original pavement and used as the cushion material, so that the emission of construction waste is reduced, the cost is saved, the pollution is reduced, and the environment is protected.

Further, an asphalt waterproof layer is arranged outside the pipe joint, and the asphalt waterproof layer is coated by two layers of asphalt so as to increase the water tightness of the pipe joint.

Further, the circular culvert foundation comprises two parts: one part is the casting concrete positioned at the bottom of the pipe joint, and the other part is the casting concrete positioned above the bottom of the pipe joint after the pipe joint is installed on the round pipe culvert foundation.

Further, the radian of the arc-shaped joint surface of the cast concrete at the bottom of the pipe joint and the pipe joint is 120 degrees. The joint radian of 120 degrees enables the bottom of the pipe joint to be effectively supported, and structural stability between the pipe joint and the circular pipe culvert foundation is improved.

Further, be provided with the thickness 5 cm's cement mortar layer between the circular pipe culvert basis with the bed course, the width on cement mortar layer compares the width on circular pipe culvert basis increases 10cm on every side, has improved the structural stability between circular pipe culvert basis and the bed course.

Further, the terminal surface of entrance to a cave is provided with the headwall structure, the headwall structure includes: an end wall foundation and an end wall are sequentially arranged from bottom to top; wherein, the type of headwall includes: splayed wall, straight wall.

Further, the gradient of the cross section of the cushion layer along the axial direction of the pipe joint is 1:1, and the width of the upper part of the cross section of the cushion layer along the axial direction of the pipe joint is increased by 50cm on each side compared with the width of the round culvert foundation; the thickness of the cushion layer is 50cm, so that the stability of the round pipe culvert base structure is improved.

Further, the cross section gradient of the cushion layer along the lateral direction of the end wall is 1:1; the width of the upper part of the cross section of the cushion layer along the lateral direction of the end wall is increased by 50cm compared with the width of each side of the side face of the end wall foundation of the straight wall, and the structural stability between the end wall structure and the cushion layer is improved.

Further, the aperture of the pipe joint is phi 1.5m, and the construction efficiency is effectively ensured by adopting a general type pipe joint type.

Compared with the prior art, the round pipe culvert base cushion layer structure has the beneficial effects that:

The round pipe culvert substrate cushion layer has simple and reasonable structure and strong integrity, improves the structural strength and stability of the round pipe culvert substrate, reduces the occurrence of damage, simplifies the process and reduces the cost; the original pavement milling material can be used for cushion construction, so that the cost and the masonry quantity of constructors are saved, the construction efficiency is improved, the construction is simple, the emission of construction waste is reduced, the pollution is reduced, and the environment is protected.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic view of an end wall elevation of a tubular culvert base mat structure in accordance with an embodiment of the utility model;

FIG. 2 is a schematic view of a cross section of a culvert body of a tubular culvert base mat structure in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic side view of a straight wall of a round pipe culvert base mat structure in accordance with an embodiment of the present utility model.

The labels in the figures are:

1. Cushion layer, 2, round pipe culvert body, 3, tube coupling, 4, round pipe culvert basis, 41, the concreting of tube coupling bottom, 5, end wall structure, 51, end wall basis, 52, end wall, 6, cement mortar layer.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the term "connected" should be interpreted broadly, and for example, it may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be connected inside two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Embodiments of the present utility model will be described in detail below with reference to the attached drawings:

an embodiment of the present utility model provides a circular pipe culvert base cushion layer structure, as shown in fig. 1 to 3, including:

A cushion layer 1 and a round pipe culvert body 2 are sequentially arranged from bottom to top; the end part of the round pipe culvert body 2 is an opening;

the round pipe culvert body 2 comprises: the circular pipe culvert foundation 4 and the pipe joint 3 are sequentially arranged from bottom to top, and the top of the circular pipe culvert foundation 4 is an arc surface and is tightly attached to the pipe joint 3;

the cushion layer 1 adopts original road milling materials and/or stone residues or cement soil.

The original pavement milling material is the water-stable stone mixture scraped by the milling machine for the original damaged cement-stable broken stone pavement, and the milling material is used as the material backfill of the original pavement and used as the material of the cushion layer 1, so that the emission of construction waste is reduced, the cost is saved, the pollution is reduced, and the environment is protected.

The outside of tube coupling 3 is provided with the pitch waterproof layer, the pitch waterproof layer adopts two-layer pitch coating for increase the water tightness of tube coupling 3.

The circular pipe culvert foundation 4 comprises two parts: one part is the cast concrete 41 at the bottom of the pipe section, and the other part is the cast concrete above the bottom of the pipe section 3 after the pipe section is mounted on the round pipe culvert foundation.

In this embodiment, the radian of the arc-shaped joint surface of the cast concrete 41 at the bottom of the pipe section and the pipe section 3 is 120 °. The joint radian of 120 degrees enables the bottom of the pipe joint 3 to be effectively supported, and structural stability between the pipe joint 3 and the circular pipe culvert foundation 4 is improved.

The cement mortar layer 6 with the thickness of 5cm is arranged between the circular pipe culvert foundation 4 and the cushion layer 1, and the width of the cement mortar layer 6 is increased by 10cm at each side of the width of the circular pipe culvert foundation 4 compared with that of the circular pipe culvert foundation 4, so that the structural stability between the circular pipe culvert foundation 4 and the cushion layer 1 is improved.

The terminal surface of entrance to a cave is provided with headwall structure 5, headwall structure 5 includes: an end wall foundation 51 and an end wall 52 which are sequentially arranged from bottom to top; wherein the end wall 52 comprises: splayed wall, straight wall.

The gradient of the cross section of the cushion layer 1 along the axial direction of the pipe joint 3 is 1:1, and the width of the upper part of the cross section of the cushion layer 1 along the axial direction of the pipe joint 3 is increased by 50cm compared with the width of each side of the circular pipe culvert foundation 4; the thickness of the cushion layer 1 is 50cm, so that the stability of the circular pipe culvert base structure is improved.

The cross section gradient of the cushion layer 1 along the lateral direction of the end wall 52 is 1:1; the upper width of the cross section of the cushion layer 1 along the lateral direction of the end wall 52 is increased by 50cm compared with the lateral width of the end wall foundation 51 of the straight wall, so that the structural stability between the end wall structure 5 and the cushion layer 1 is improved.

In the embodiment, the aperture of the pipe joint 3 is phi 1.5m, and the construction efficiency is effectively ensured by adopting a general type pipe joint type.

The round pipe culvert base cushion layer structure is simple and reasonable, has strong integrity, improves the structural strength and stability of the rainwater pipeline concrete full package, reduces the occurrence of damage, simplifies the process and reduces the cost; the original road milling material is used for cushion construction, so that the construction is simple, the emission of construction waste is reduced, the pollution is reduced, and the environment is protected.

Application example

The construction scheme is as follows:

1. foundation lofting and foundation pit excavation:

1.1, measuring and lofting work before foundation pit excavation: the method comprises the steps of discharging a circular pipe culvert foundation excavation axis and a road center line by using a total station, measuring the ground elevation by using a level gauge, combining the design elevation of the foundation gravel cushion layer bottom on a drawing, calculating the depth to be excavated, combining the axis and the road center line by constructors, and excavating the depth according to 1: and 1, calculating the length and the width of an upper opening of the excavation, and scattering the plane size of the excavation of the foundation pit by using lime. During excavation, the periphery of the foundation pit is widened by 50-100 cm, and a construction working surface is reserved.

1.2, Excavation of foundation pit: the excavator is matched with the dump truck to excavate the earthwork of the foundation pit, a layer of 20-30 cm is reserved when the foundation pit is excavated to be close to the elevation of the substrate, artificial assault is adopted to excavate the foundation pit before foundation construction, the drainage work is needed to be done in the excavation process and after the excavation is completed, the water collecting grooves are dug around the foundation pit, the foundation pit is led to a water collecting well arranged outside the foundation, and the foundation pit is extracted by a submersible pump so as to avoid the influence on the bearing capacity of the foundation due to the fact that the substrate is immersed in water.

2. Foundation pit inspection, gravel layer and foundation construction:

2.1 foundation pit inspection: and after the pit bottom elevation reaches a design value, checking the bearing capacity, elevation and plane size of the foundation. Designing a foundation with bearing capacity not less than 150Kpa, performing a sounding test, and requiring that the bearing capacity is larger than the value, and directly backfilling gravel at the moment to build a foundation on the gravel; if the bearing capacity is smaller than the value, the depth range with insufficient bearing capacity is excavated and filled with materials such as gravel or broken stone. The elevation is controlled within the standard requirement, and the gravel layer and the foundation concrete construction are immediately carried out after the inspection is qualified.

2.2 Cushion layer construction: the round pipe culvert is designed by adopting a 50cm thick cushion layer, the material is required to have good water permeability, good grading, clean surface, mud content not more than 5% and maximum grain diameter not more than 5cm; in order to facilitate the construction of the foundation concrete of the circular pipe culvert, the periphery of the cushion layer can be filled with 10-20 cm wider than the design value, and the cushion layer is tamped by a plate until the surface is flat and compact.

2.3, Foundation construction: in the embodiment, the round pipe culvert foundation is constructed in two layers, C20 concrete is adopted, the embedding depth of the round pipe culvert foundation meets the design requirement, and the elevation and the plane position of the front bottom of the primary round pipe culvert foundation vertical die are checked to be qualified. When the foundation template adopts a steel mould or a wood mould and is assembled, double-sided adhesive tape is stuck at the joint, so that slurry leakage during pouring is prevented. The basic side is outwards 1:1, the back rib of the side template adopts a steel pipe to be supported and fixed at the pit bottom through a short square timber or a steel pipe. Setting a settlement joint at intervals of 4-6 m on the foundation, and filling sand for treatment, wherein the joint width is 3 cm. When the template is constructed, the template is required to be blocked, the template is erected and poured according to the setting condition of the settlement joint, adjacent blocks are separated by foam plates with the thickness of 3cm at the settlement joint, and particularly, the length of the foundation blocking is required to be added with the length of the joint of two adjacent pipe joints to be 0.5-1 cm besides the integral pipe joint. And pouring the primary round pipe culvert foundation 2-3 cm below the pipe bottom, and pouring the part above the pipe bottom after the pipe joint is placed in place. The vibrating bar is compact in vibration, the foundation line shape after the die is disassembled is required to be straight and smooth, the edges and corners are clear, the surface is smooth, and the phenomena of corner falling, bending and pothole cannot be caused.

The end wall foundation is required to be poured simultaneously with the primary round pipe culvert foundation, the concrete label is the same as that of the primary round pipe culvert foundation. The construction of the end wall foundation requires manual excavation, the end wall foundation is excavated to the pit bottom elevation according to the design size on the drawing, and concrete is poured after the end wall foundation is inspected to be qualified. When construction lofting, the end wall foundation can be properly adjusted in position, namely the culvert length, on the premise of unchanged structural size, so that the end face of the outermost pipe joint and the end part of the end wall foundation can be in the same vertical plane, but the culvert length is required to meet the design and specification requirements.

The surfaces of the primary round pipe culvert foundation and the end wall foundation are subjected to roughening treatment, floating pulp and loose particles are chiseled, hard coarse aggregate is exposed, and the round pipe culvert foundation and the end wall foundation are cleaned and washed with water to meet the standard requirements.

3. And (3) pipe joint approach inspection:

According to the requirement of a bidding document, all round pipe culvert pipe sections are subjected to finished pipe section acceptance work after entering according to a plan, appearance inspection is carried out, and the finished product meets the following requirements:

The end face of the pipe joint is flat and vertical to the axis (mainly referred to as an orthogonal culvert); the inner side surface and the outer side surface of the pipe wall are flat and smooth, no damage or crack exists, and serious honeycomb, pitting surface and peeling phenomena are avoided, if the honeycomb exists, the area of each honeycomb is not more than 30mm or 30mm, the depth of each honeycomb is not more than 10mm, the total area is not more than 1% of the whole area, ribs are not exposed, and the honeycomb can be used after the repair is completed; the allowable deviation of the sizes of all parts of the pipe joint is as follows: the length of the tube is 0-10 cm, the inner diameter and the outer diameter are not smaller than the design value, the thickness of the tube is minus 3mm, and the positive value is not limited.

4. And (3) pipe joint installation:

the following preparation work is carried out before the pipe joint installation operation:

4.1, after the top elevation and the plane size of the foundation are inspected to be qualified, discharging the central axis of the bottom of the pipe and the central line of the road on the foundation, ejecting by using ink lines, arranging the pipe joints of the culvert pipe according to the setting condition of the settlement joint, and ejecting the concrete placement position of each pipe joint by using the ink lines.

And 4.2, adopting anti-collision measures to avoid damage to the pipe joint.

5. And (3) pipe joint treatment and secondary round pipe culvert foundation pouring:

And after the pipe joint is installed and qualified, pipe joint and settlement joint treatment is carried out. The pipe joint seam adopts an M10 mortar plastering ring, the plastering ring is 15cm wide and 3cm thick, and the mortar is required to be full and the line type is graceful. And after the ring is smeared, water is sprayed in time for health maintenance so as to prevent cracks, peeling and falling off on the surface of the sand control slurry. The treatment width of the settlement joint is 15cm, asphalt hemp batting is filled in the pipe joint, two layers of asphalt immersed hemp cloth are paved for winding the pipe wall for one circle until the pipe joint is full and compact, the hemp rope with D=2cm is wrapped for winding for one circle, two layers of asphalt immersed hemp cloth are paved for winding for one circle, and finally four crude lead wires are used for binding for one circle along the pipe wall, so that the binding is compact, and the asphalt material meets the design specification requirement.

And (3) performing secondary pouring of the round pipe culvert foundation after the pipe seam is qualified after the primary foundation and the end wall foundation are qualified after the inspection. The template adopts a steel template or a wood template, and the back rib of the template adopts a steel pipe to be supported and fixed at the pit bottom through a short square wood or a steel pipe. Same round pipe culvert for concrete construction process and (5) pouring the foundation once.

6. And (3) end wall construction:

The end wall construction adopts factory steel templates, transverse and vertical back ribs of transverse plates adopt phi 48, delta=3.5 mm steel pipes, vertical spacing is 60cm, horizontal spacing is 75cm, and inner and outer templates are connected and fixed through counter-pull rods (phi 16mm round steel bars, two ends are sleeved with threads, and tightness is adjusted by nuts). When the templates are assembled, sponge strips or double-sided foam rubber are added at the joints to prevent slurry leakage, and the dislocation at the joints cannot exceed 2mm; before concrete pouring, the surface of the template must be uniformly coated with a film supporting agent; setting up a springboard to an upper opening of the end wall before concrete pouring, and carrying out layered pouring by adopting a manual pushing trolley, wherein vibration is required to be compact. The line type is required to be straight and smooth after the die is removed, and the phenomena of slurry leakage and corner missing are avoided.

7. Splayed wall foundation and splayed wall construction:

The splayed wall foundation is carried out after the foundation pit is inspected to be qualified, a steel template or a wood template is adopted as a template, a soil template (the foundation size should be strictly controlled at the moment) can be also used when groundwater is very small or no groundwater, the template is erected strictly according to the design size of a drawing, the construction process of concrete is the same as that of a circular pipe culvert foundation, and the surface roughening treatment is carried out.

The foundation surface of the splayed wall is required to be washed clean before construction so as to ensure good combination, after the splayed wall is inspected to be qualified, the mold can be erected, the large sample of four bottom edges of the splayed wall is discharged before the mold is erected, and the mold is erected along the edge line by using ink lines to pop up. The template adopts a large steel template and a small amount of bamboo plywood templates, and the surface is required to be flat, smooth and free of deformation. When the splayed wall is poured, the slump and the water-cement ratio are controlled, and because the form is special and the pouring time is long, the slump is small in control point, the deformation condition of the inclined plane is observed before initial setting, the surface is smeared in time, and the side lines of the inclined plane are marked on the template, so that the edges and corners of the structure are straight and smooth. After pouring, attention is paid to health preservation, and the health preservation period is not less than 7 days.

8. Auxiliary engineering:

8.1 cap stone construction: c25 plain concrete was used. The cap stone construction is carried out after the end wall and the splayed wall are completed. The size and specification of the hat stone meet the requirements of drawing and specification, the template adopts a steel template, and is accurately positioned according to the lofting position, so that the hat stone is required to be straight, smooth, compact and free of bending and hollowing.

8.2, Paving a hole and constructing a water-proof wall: the hole is built by adopting C20 stone concrete, the stone blocks are required to be built by layering and staggered joint, slurry concrete is squeezed tightly, and the filling is full and compact, so that a hole cannot be formed; the waterproof wall adopts C25 concrete pouring, and is linear, straight, smooth, free of bending phenomenon, flat and compact in surface, and free of edge biting and corner falling.

8.3, Waterproof construction: after the construction of each structural part of the whole culvert is completed, the outer wall of the whole culvert pipe is uniformly coated with two layers of asphalt, and the pipe joint is coated with three layers of asphalt so as to prevent water seepage.

9. Backfilling construction of the bench back:

And (5) carrying out bench back backfilling construction after the strength of each part of the circular pipe culvert reaches 75% of the design strength.

9.1 Material requirements: adopts sandy soil or sand gravel soil and other fillers with good water permeability.

9.2 Preparation for construction: before backfilling the bench back, cleaning up garbage in the foundation pit in the bench back range, if water exists in the pit, pumping out the water by using a submersible pump, manually digging out sludge and rotting matters soaked by the water, completely shoveling loose soil on grooves of the original ground on two sides, measuring the width of the bottom of the slope, and requiring the minimum width to be not less than 2 meters, excavating steps from bottom to top, wherein the step specification is 2 meters wide and 0.5 meter high, and the steps are straight and smooth and have no loose floating soil; the materials used for filling the soil are transported to the site after being inspected, and the materials are prepared; the construction machinery used for filling is specially configured, and the YZ18 road roller, the bulldozer, the ZL50 loader, the dump truck, the plate compactor and the like are all specially configured, so that the construction machinery is reasonably configured, continuous operation is ensured, and layered filling of the two sides and the bench back is continuously and orderly carried out. Before backfilling, making layered marking lines on the table body by using red paint, marking layer numbers, and taking special engineering photos.

9.3 Soil filling construction arrangement: firstly, transporting qualified backfill materials to the site, calculating the quantity of materials required by each layer of each housing bottom according to the pit bottom size and the layered loose paving thickness of 15cm, putting the shovel materials of the loader into the pit, uniformly pushing the bulldozer, taking care of leaving 2% of bidirectional transverse slopes, leveling places which are not pushed and not pushed by the bulldozer by adopting manual cooperation, taking care of reasonable material grading, leveling uniformly, and avoiding the phenomenon of material pit collecting; super-particle diameter particles and (5) manually picking up impurities such as tree roots. After the soil is filled to the original ground or the height of the roadbed of the connecting section, the soil is synchronously filled with the roadbed, the width of the soil is paid attention to, the soil is communicated with the roadbed of the connecting section after the soil is filled to the height of the culvert top, and at the moment, when the height of the soil is filled to the culvert top to be less than 50cm, any heavy truck and construction machinery are strictly forbidden to pass, so that the damage to a structure is avoided.

9.4 Back compaction: compacting by using a YZ18 road roller, firstly carrying out static pressure for 2 times at a low speed, then carrying out vibration rolling for 4-5 times at a low speed, and finally carrying out static pressure for 1-2 times until no obvious tire track exists, wherein a safe distance of 20-30 cm is kept between the road roller and the pipe wall in the rolling process so as to avoid damaging culverts, and the rolling is carried out at a low speed so as not to damage splayed walls, pipe walls, cap stones and the like; the road roller cannot turn around in the bench back, and is turned around on the roadbed and then opened on the bench back; manually compacting the place where the road roller cannot be compacted, wherein the plate ramming comprises a culvert pipe part, a reentrant corner part of a splayed wall and the like; after rolling, the surface should be flat and compact, and no phenomena of uneven pits, aggregate pits and the like exist.

The process flow of the circular pipe culvert construction comprises the following steps:

Measuring and setting-out, foundation treatment, casting of round pipe culvert foundation, installation of pipe joints, casting of the rest round pipe culvert foundation, joint treatment, hole masonry, back backfilling of culvert and the like.

1. And (3) measuring and lofting:

before the construction of the round pipe culvert, the position of the plane axis of the culvert, the length of the culvert and the construction width are firstly determined by measuring lofting, and the edge line is paid out by lime.

2. And (3) foundation treatment:

The foundation must be treated prior to the construction of the pipe socket foundation. Cleaning and leveling the substrate, and tamping until the substrate meets the design requirement.

3. And (3) pouring a foundation:

The round pipe culvert foundation is generally a concrete or grout stone foundation. The concrete foundation is poured twice: the thickness of the foundation under the pipe is about 20cm, the pipe seat foundation at the part above the pipe bottom is poured after the pipe joint is installed, and the reference number of the foundation concrete is not less than 10. Before pouring the round pipe culvert foundation, a cushion layer with the thickness of about 10cm can be filled in, so that the uniformity of the foundation is improved. In order to adapt to the uneven settlement of the foundation, the round pipe culvert foundation should be provided with a settlement joint.

4. And (3) pipe joint installation:

The culvert pipe section adopts prefabricated members, and pipe section installation is carried out after the foundation strength of the round culvert is qualified. The pipe joint installation is to mark the central line of the culvert pipe on the basis, install the end pipe joints at the water inlet and the water outlet to control the total length of the culvert pipe, and then install the middle pipe joint section by section. And keeps the overall axis from being offset. Each adjacent pipe joint should keep the bottom surface free from dislocation, and the joint is inspected horizontally during installation. The seam width of the adjacent pipe sections should be not more than 1-2 cm.

5. And (3) joint treatment:

In order to prevent the joint from leaking water, the joint is subjected to waterproof treatment. Typically, round culverts employ plain joints, the joints of which are typically first plugged with a batting through which hot asphalt is impregnated, then filled with hot asphalt, and finally wrapped in two layers with a felt of asphalt saturated with hot asphalt. The pipe section can also be subjected to hot asphalt coating waterproof treatment.

6. Building the hole:

the end wall type hole (also called as a straight wall hole) is adopted, and stone or concrete can be poured. The end wall type opening is generally connected with the natural groove and the roadbed on the external taper of the end wall. The splayed wall hole can be adopted in the areas rich in stones.

In order to prevent water flow flushing, paving and reinforcing are carried out on the inlet ditch bed and the outlet ditch, the paving length is generally not less than 1 meter, and the paving length is prolonged or the water cut wall is deepened when the water flow speed is high.

7. Backfilling culvert backs:

and filling and tamping the culvert back in a horizontal layered manner within the range that the aperture of the two sides of the culvert body is not less than twice. The filling material is preferably gravel with good water permeability.

The quality requirements of the circular pipe culvert construction are as follows: smooth culverts, smooth inlets and outlets, and no water blocking phenomenon of culverts; the appearance of the stone is required to be straight and free of warpage, i.e. a straight wall or a splayed wall.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will be within the scope of the present utility model.

The foregoing description is only of the preferred embodiments of the utility model and is not intended to limit the utility model; various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (8)

1. A tubular culvert base mat structure, comprising: cushion layers and round pipe culverts are sequentially arranged from bottom to top; the end part of the round pipe culvert body is an opening;

The round pipe culvert body comprises: the pipe joint is tightly attached to the round pipe culvert foundation, and the top of the round pipe culvert foundation is an arc surface;

the cushion layer is paved by adopting original road milling materials and/or stone slag or cement soil;

An asphalt waterproof layer is arranged outside the pipe joint, and the asphalt waterproof layer is coated by two layers of asphalt.

2. The tubular culvert base cushion structure of claim 1, wherein the tubular culvert base comprises two portions: one part is the casting concrete positioned at the bottom of the pipe joint, and the other part is the casting concrete positioned above the bottom of the pipe joint after the pipe joint is installed on the round pipe culvert foundation.

3. The round pipe culvert base bedding structure of claim 2 wherein the arc of the cast concrete at the bottom of the pipe section and the arcuate engagement surface of the pipe section is 120 °.

4. The round pipe culvert base bedding structure of claim 1, wherein a cement mortar layer with a thickness of 5cm is arranged between the round pipe culvert base and the bedding layer, and the width of the cement mortar layer is increased by 10cm on each side compared with the width of the round pipe culvert base.

5. The tubular culvert base bedding structure of claim 1, wherein an end face of the portal is provided with an end wall structure comprising: an end wall foundation and an end wall are sequentially arranged from bottom to top; wherein, the type of headwall includes: splayed wall, straight wall.

6. The round pipe culvert base bedding structure of claim 1, wherein a cross-sectional gradient of the bedding layer along the pipe section axial direction is 1:1, and an upper width of the cross-section of the bedding layer along the pipe section axial direction is increased by 50cm on each side compared with a width of the round pipe culvert base; the thickness of the cushion layer was 50cm.

7. The round pipe culvert base bedding structure of claim 5 wherein the bedding has a cross-sectional slope of 1:1 in the lateral direction of the headwall; the width of the upper part of the cross section of the cushion layer along the lateral direction of the end wall is increased by 50cm on each side compared with the width of the side face of the end wall foundation of the straight wall.

8. The circular pipe culvert base bedding structure of any one of claims 1-7 wherein the pipe section has a pore size of phi 1.5m.