CN113215995B - Method for constructing bridge road in narrow space - Google Patents

Abstract

The invention discloses a method for constructing a bridge road in a narrow space, which comprises the following steps: excavating a mountain body at the back of the existing retaining wall; the excavated mountain body includes an upper surface, a bottom surface and a slope surface; Elevation, the bottom surface is excavated to the foundation level of the existing retaining wall, and the transition between the top and the bottom surface is through the slope; the existing retaining wall is removed; the new retaining wall is constructed on the original site of the existing retaining wall, and the bottom surface is constructed close to the new retaining wall The first row of bridge pile foundations of the wall; the first backfill to the top elevation of the new retaining wall; on the basis of the backfilled soil layer and slope, the second row of bridge pile foundations, caps, piers and Bridge superstructure; the second time backfill soil to the elevation of the top surface of the subgrade, and implement the pavement structure on the backfilled soil layer and the top of the upper surface. This scheme opens up a new idea, which can not only ensure the safety of the mountain during construction, but also provide a safe subgrade and support structure for the subgrade on the top of the wall.

Description

A method of constructing bridge roads in narrow spaces

technical field

The invention is used in the field of urban road construction, and particularly relates to a method for constructing bridge roads in narrow spaces.

Background technique

Retaining wall is a common structure in urban road engineering construction, and its function is to ensure the safety of urban roads during use. As far as the location of the retaining wall is concerned, it can generally be divided into shoulder wall and cutting wall. According to the order of implementation, first deal with the soft foundation below the roadbed, when the strength of the roadbed and post-construction settlement meet the requirements, then implement the retaining wall, and finally implement the pavement structure. The retaining wall provides security for the pavement structure. Retaining walls and pavement structures have corresponding requirements for the strength of the subgrade and post-construction settlement. The common retaining wall forms in urban roads mainly include gravity type, cantilever type, buttress type, etc. The height of gravity type retaining wall can reach 12m, but the number of wall materials is large, and the bearing capacity requirements are high; cantilever type retaining wall The wall height is generally not more than 5m, which is relatively thin, but the width of the foundation is large, and the bearing capacity of the foundation is relatively low; the height of the buttress retaining wall is not more than 15m, and the material is less, but the width of the foundation is large, and the bearing capacity of the foundation is required. relatively low.

The implementation of the retaining wall is generally a formwork with brackets on site, which requires a spacious site, especially in the form of a retaining wall with a large foundation. Several common retaining wall forms on urban roads have accumulated rich experience and mature technology in the application process, but also exposed their own problems. Gravity retaining walls use a large amount of stone, and people pay more and more attention to the current environmental protection concept. Stone saving is a development direction; The impact is greater and the land is used more.

Referring to Figure 1, the retaining wall at the foot of the mountain slope has a mountain on one side and a building on the other, similar to a cutting retaining wall in an urban road. The line position of the urban road project passes through the mountain above the retaining wall. In order to avoid occupying buildings, the line of the urban road is parallel to the retaining wall, and the width of the roadbed extends to the top of the mountain slope. At this time, a half filled and half excavated roadbed is formed. , forming a subgrade plane. On the premise that the land use is not increased and the buildings are not demolished, the height of the retaining wall at this time is higher than the existing retaining wall, and the form of the retaining wall is changed from a cutting retaining wall to an embankment retaining wall. This poses a challenge for the reconstruction of retaining walls in small spaces and for urban road construction.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a method for constructing a bridge road in a narrow space.

The technical scheme adopted by the present invention to solve its technical problems is:

A method of constructing a bridge road in a narrow space, comprising the following steps:

Excavate the mountain behind the existing retaining wall. The excavated mountain includes the upper surface, the bottom surface and the slope surface. The upper surface is excavated to the elevation of the top surface of the roadbed, and the bottom surface is excavated to the foundation elevation of the existing retaining wall. , the transition between the upper surface and the bottom surface is through the slope surface;

remove said existing retaining wall;

Construct a new retaining wall at the original site of the existing retaining wall, and construct the first row of bridge pile foundations close to the new retaining wall on the bottom surface;

Backfill soil for the first time to the top elevation of the new retaining wall;

On the foundation formed by the backfilled soil layer and the slope surface, construct the second row of bridge pile foundations, caps, bridge piers and bridge superstructure;

Backfill the soil to the top level of the subgrade for the second time, and implement the pavement structure on the backfilled soil layer and the top of the upper surface.

In some embodiments, steps are excavated on the slope formed by excavating the mountain, and concrete is sprayed on the slope.

In some embodiments, the newly constructed retaining wall includes a plurality of anti-sliding piles, the anti-sliding piles are distributed at intervals along the extending direction of the newly constructed retaining wall, and prefabricated anti-sliding piles are arranged between adjacent anti-sliding piles. A soil retaining plate, the side of the anti-sliding pile is provided with a slot, and a plurality of the prefabricated soil retaining plates are assembled in the slot along the height direction.

In some embodiments, the prefabricated retaining plate is distributed with a plurality of scuppers arranged up and down, the scuppers are connected to a drainage ditch through a vertical drainage pipe on the outer side of the newly built retaining wall, and the scupper is connected to a drainage ditch. The water hole is provided with a reverse filter layer on the back side of the newly built retaining wall.

In some embodiments, bubble light soil is used for the first backfill.

In some embodiments, the road line is laid before the second backfill.

In some embodiments, the second backfill is air-bubble lightweight soil.

In some embodiments, the second backfill is provided with a stable slope on the outside of the roadbed that transitions to the top of the newly built retaining wall.

In some embodiments, the stable side slope is provided with steps and covered with edging soil, and the edging soil is planted with vegetation.

One of the above technical solutions has at least one of the following advantages or beneficial effects: the retaining wall is relatively close to the building, there is no construction space, and a construction space needs to be found on the side of the mountain. At the same time, the side of the mountain is relatively close to the pile foundation of the bridge to be built, so it is impossible to implement the retaining wall on the side of the current retaining wall on the side of the mountain without removing the existing retaining wall. This scheme provides a complete set of measures to solve this specific situation, opening up construction space on the side of the existing retaining wall close to the mountain, while ensuring the stability of the mountain slope, providing space for the demolition and reconstruction of the retaining wall and bridge construction. This scheme opens up a new idea for the reconstruction of retaining walls in a narrow space, the design and construction of bridges and roads, which can not only ensure the safety of the mountain during construction, but also provide a safe roadbed and supporting structure for the roadbed at the top of the wall. .

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram of an initial state of an embodiment of the present invention;

Fig. 2 is a schematic diagram of excavating mountain body according to an embodiment shown in Fig. 1;

Figure 3 is a schematic diagram of the current retaining wall dismantled according to an embodiment shown in Figure 1;

Figure 4 is a schematic diagram of the construction of a new retaining wall and a first row of bridge pile foundations according to an embodiment shown in Figure 1;

5 is a schematic diagram of the top elevation of the first backfill to the newly built retaining wall according to an embodiment shown in FIG. 1;

Fig. 6 is a schematic diagram of the construction of the second row of bridge pile foundations, caps, piers and the upper part of the bridge according to an embodiment shown in Fig. 1;

7 is a schematic diagram of the second backfill to the elevation of the top surface of the roadbed according to an embodiment shown in FIG. 1;

FIG. 8 is a schematic diagram of a road surface structure according to an embodiment shown in FIG. 1;

FIG. 9 is a plan view of a newly constructed retaining wall structure according to an embodiment shown in FIG. 1;

FIG. 10 is a top view of a newly constructed retaining wall structure according to an embodiment shown in FIG. 1 .

Detailed ways

This part will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand the present invention. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

In the present invention, if there is a description of a direction (up, down, left, right, front and rear), it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features referred to must have specific characteristics Orientation, construction and operation in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceeding", etc. are understood as not including this number; "above", "below" and "within" " etc. are understood to include the original number. In the description of the present invention, if it is described that "first" and "second" are only used for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implying the number of indicated technical features or Implicitly indicates the order of the indicated technical features.

In the present invention, unless otherwise expressly defined, words such as "setting", "installing" and "connecting" should be understood in a broad sense, for example, it may be directly connected or indirectly connected through an intermediate medium; it may be a fixed connection or a The detachable connection can also be integrally formed; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be the internal communication between the two elements or the interaction relationship between the two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solutions.

Referring to Figure 1, the height of the existing retaining wall 1 is about 6m, the distance from the existing building is about 2m, and the distance from the pile foundation of the bridge to be built is about 2m. 1 coincides. The existing retaining wall 1 is relatively close to the building 3, and there is no construction space; the distance between it and the pile foundation of the bridge to be built is relatively short, and there is no space for implementing other forms of retaining walls.

In view of this, an embodiment of the present invention provides a method for constructing a bridge road in a narrow space. The bridge road after construction is shown in FIG. 8 , including a bridge located outside the retaining wall and parallel to the retaining wall and a bridge located in the bridge Road near the side of the mountain. Specifically, the method for constructing a bridge road in a narrow space includes the following steps:

Referring to Figure 2, in order to ensure the stability of the mountain slope and the construction space of the retaining wall and the bridge pile foundation, the existing retaining wall 1 and the mountain 4 behind the wall are excavated. The excavated mountain 4 includes the upper surface 5 and the bottom surface. 6 and the slope 7, the upper surface 5 is excavated to the elevation of the top surface of the roadbed, the bottom surface 6 is excavated to the foundation elevation of the existing retaining wall 1, and the slope 7 transitions between the upper surface 5 and the bottom surface 6, specifically in some embodiments, The slope of the slope 7, the stone slope 7 is not more than 1:1, and the soil slope 7 is not more than 1:1.5.

Referring to Figure 3, the existing retaining wall 1 should be demolished. Before demolishing, the foundation form, width and depth of the building 3 should be mastered. The foundation bottom surface 6 of the retaining wall should not exceed the foundation bottom elevation of the building 3. Impact of Building 3.

Referring to FIG. 4 , a new retaining wall 2 is constructed on the original site of the existing retaining wall 1 . After the new retaining wall 2 is completed, the first row of bridge pile foundations 8 close to the new retaining wall 2 are constructed on the bottom surface 6 .

Referring to Figure 5, backfill soil 9 for the first time to the top elevation of the new retaining wall 2.

Referring to Fig. 6, on the foundation formed by the backfilled soil layer and the slope 7, the second row of bridge pile foundations, caps, bridge piers and bridge superstructure are constructed.

Referring to Figures 7 and 8, backfill soil 10 to the elevation of the top surface of the roadbed for the second time, and implement pavement structure 11 on top of the backfilled soil layer and the top surface 5.

The retaining wall is relatively close to the building 3, and there is no construction space. It is necessary to find a construction space on the side of the mountain 4. At the same time, the side of the mountain 4 is relatively close to the pile foundation of the bridge to be built, and it is impossible to implement a retaining wall on the side of the existing retaining wall 1 close to the mountain 4 without removing the existing retaining wall 1 . This scheme provides a complete set of measures to solve this specific situation, opening up construction space on the side of the existing retaining wall close to the mountain 4, while ensuring the stability of the slope of the mountain 4, providing space for the demolition and reconstruction of the retaining wall and bridge construction. This scheme opens up a new way of thinking for the reconstruction of retaining walls and the design and construction of bridges and roads in a narrow space, which can not only ensure the safety of the mountain 4 during construction, but also provide a safe roadbed and support for the roadbed at the top of the wall. structure.

In some embodiments, referring to FIGS. 2 and 3 , steps are excavated on the slope 7 formed by the excavation of the mountain body 4 . The height and width of the steps can be set as required, for example, both are 50 cm. The slopes of mountain 4 are better occluded to form a stable foundation. Spray concrete on the slope 7, and take waterproof measures during construction to ensure the stability of the slope.

In some embodiments, referring to FIGS. 9 and 10 , the newly built retaining wall 2 includes a plurality of anti-sliding piles 12 , and the anti-sliding piles 12 are distributed at intervals along the extending direction of the newly built retaining wall 2 , and the anti-sliding piles 12 serve to support The stabilizing effect of the retaining body 4 and the roadbed can also be used as the support on both sides of the retaining plate. A prefabricated earth retaining plate 13 is arranged between adjacent anti-sliding piles 12 , a slot is provided on the side of the anti-sliding pile 12 , and a plurality of prefabricated earth retaining plates 13 are assembled in the slot along the height direction. In order to save the construction period and reduce the amount of stone, the retaining plate is prefabricated in the factory and assembled on site. In this embodiment, the pile plate type retaining wall structure is adopted, and the retaining plate is prefabricated and installed in the factory, which reduces the on-site support and saves the construction period.

Further, the prefabricated retaining plate 13 is distributed with a plurality of drainage holes 14 arranged up and down. The drainage holes 14 are connected to the drainage ditch 16 with a cover plate on the outside of the newly built retaining wall 2 through the vertical drainage pipe 15, and the drainage holes 14 The water hole 14 is provided with a reverse filter layer 17 on the back side of the newly built retaining wall 2 . The drain hole 14 is connected with a drain pipe, and the drain pipe is connected to the drain ditch 16, which improves the problem that the water from the drain hole 14 pollutes the wall, and is conducive to the formation of a good landscape.

In some embodiments, the first backfill 9 is made of air-bubble light soil, and the retaining plate of the retaining wall can be used as the outer wall of the air-bubble light-weight soil. After the air-bubble light-weight soil has formed its strength, it can stand vertically and stand in the air. The lateral pressure of the face is close to 0, which is more favorable than backfilling with ordinary soil, reducing the lateral pressure. The bridge pile foundation is implemented here, and one side is located on the slope, and the bubble light soil is used to solve the problem that ordinary soil is difficult to compact.

In some embodiments, road lines are laid before the second backfill 10 .

Further, the second backfill 10 adopts bubble light soil, and there are many urban road pipelines, so bubble light soil is adopted, which solves the problem that the ordinary soil roadbed is difficult to compact.

In some embodiments, referring to FIG. 7 , the second backfill 10 is provided with a stable slope transitioning to the top of the newly built retaining wall 2 on the outside of the roadbed.

Further, the stable slope is set with steps and covered with edging soil, and the edging soil is planted with vegetation. Set up anti-collision guardrails near the stable slope of the bubble light soil.

The innovation points of the technical solutions of the embodiments of the present invention mainly include three points. The first point is that the cutting retaining wall located at the foot of the slope of the mountain body 4, which is restricted by the building 3 and the bridge pile foundation on both sides respectively, is converted into an embankment retaining wall. practical solutions. The order of implementation of retaining walls and side slopes is changed from the conventional bottom-to-top to top-to-bottom, which not only ensures the orderly development of each project, but also ensures the safety of the mountain 4 during the construction process. The second point is that the backfill material of this scheme uses bubble light soil instead of ordinary subgrade soil, which solves the problem of difficult compaction under the conditions of many piles and various underground pipelines and slopes. The strength of the bubble light soil is higher than that of the ordinary soil, and it can stand upright after the strength is formed, which is beneficial to reduce the lateral pressure of the slope on the retaining wall. The third point is the use of pile-plate retaining wall structure. The retaining plate is prefabricated and installed in the factory, which reduces the on-site support and saves the construction period. The drain hole 14 is connected with a drain pipe, and the drain pipe is connected to the drain ditch 16, which improves the problem that the water from the drain hole 14 pollutes the wall, and is conducive to the formation of a good landscape.

In the description of this specification, description with reference to the terms "example", "embodiment" or "some embodiments" etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one aspect of the present invention in one embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer 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.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present invention, and these equivalent modifications or replacements are included in the claims of the present application. within a limited range.

Claims (9)

1. a method for constructing bridge roads in narrow space, is characterized in that, comprises the following steps: Excavate the mountain behind the existing retaining wall. The excavated mountain includes the upper surface, the bottom surface and the slope surface. The upper surface is excavated to the elevation of the top surface of the roadbed, and the bottom surface is excavated to the foundation elevation of the existing retaining wall. , the transition between the upper surface and the bottom surface is through the slope surface; remove said existing retaining wall; Construct a new retaining wall at the original site of the existing retaining wall, and construct the first row of bridge pile foundations close to the new retaining wall on the bottom surface; Backfill soil for the first time to the top elevation of the new retaining wall; On the foundation formed by the backfilled soil layer and the slope surface, construct the second row of bridge pile foundations, caps, bridge piers and bridge superstructure; Backfill the soil to the top level of the subgrade for the second time, and implement the pavement structure on the backfilled soil layer and the top of the upper surface. 2 . The method for constructing a bridge road in a narrow space according to claim 1 , wherein steps are excavated on the slope formed by excavating a mountain, and concrete is sprayed on the slope. 3 . 3 . The method for constructing a bridge road in a narrow space according to claim 1 , wherein the newly constructed retaining wall comprises a plurality of anti-sliding piles, and the anti-sliding piles are along the extension direction of the newly constructed retaining wall. 4 . Spaced distribution, prefabricated earth retaining plates are arranged between the adjacent anti-sliding piles, slots are arranged on the sides of the anti-sliding piles, and a plurality of the prefabricated earth retaining plates are assembled in the slots along the height direction. 4 . The method for constructing a bridge road in a narrow space according to claim 3 , wherein the prefabricated earth retaining plate is distributed with a plurality of drainage holes arranged up and down, and the drainage holes are located in the newly built earth retaining plate. 5 . The outer side of the wall is connected to a drainage ditch through a vertical drainage pipe, and the drainage hole is provided with a reverse filter layer on the back side of the newly built retaining wall. 5 . The method for constructing bridge roads in narrow spaces according to claim 1 , wherein the first backfill is made of air-bubble light soil. 6 . 6 . The method for constructing bridge roads in narrow spaces according to claim 1 , wherein road pipelines are laid before the second backfilling. 7 . 7 . The method for constructing bridge roads in a narrow space according to claim 6 , wherein the second backfill is made of air-bubble light soil. 8 . 8 . The method for constructing a bridge road in a narrow space according to claim 1 , wherein the second backfill is provided with a stable slope on the outside of the roadbed that transitions to the top of the newly built retaining wall. 9 . 9 . The method for constructing a bridge road in a narrow space according to claim 8 , wherein steps are arranged on the stable side slope, and the edging soil is covered, and the edging soil is planted with vegetation. 10 .

Images