CN209836706U - Road extension structure - Google Patents
Road extension structure Download PDFInfo
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- CN209836706U CN209836706U CN201920152569.8U CN201920152569U CN209836706U CN 209836706 U CN209836706 U CN 209836706U CN 201920152569 U CN201920152569 U CN 201920152569U CN 209836706 U CN209836706 U CN 209836706U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The embodiment of the utility model provides a road enlargement structure is provided in road construction field, include: prefabricating a wall body and a cantilever plate; the prefabricated wall body is arranged on the side surface of the pavement of the road to be expanded; a shear groove is arranged at the top of the prefabricated wall body; and the groove wall on one side of the shear groove is connected with the top of the prefabricated wall body, and one end of the prefabricated cantilever plate is inserted into the shear groove. The road extension structure provided by the embodiment of the utility model adopts the prefabricated wall body and the prefabricated cantilever plate, so that the factory prefabrication and the construction of other on-site stages can be simultaneously carried out, and the construction period is shortened; the adoption of the cantilever plate structure reduces the occupied area, avoids building a lower retaining structure on a steep slope or a river side, reduces the scale and difficulty of the lower retaining, reduces the proportion of bridges, and has obvious advantages in earth and stone space, masonry blocking and protecting amount and land utilization scale; and the shear groove is adopted to connect the prefabricated wall body and the prefabricated cantilever slab, so that the bending moment resistance of the belt path can be enhanced.
Description
Technical Field
The embodiment of the utility model provides a relate to road construction technical field, especially relate to a road enlargement structure.
Background
The steep slope or the widened road of the section near the river usually adopts the parallel equal-height setting principle, the cross section form of the half moat half embankment is generated, if the existing upper retaining and lower retaining measures are adopted, the dilemma of insufficient retaining and protecting capacity is possibly caused, even the solution can be realized by adopting the half-bridge form of the half road with higher manufacturing cost, the unfavorable situations that the filling and digging amount is large, the upper and lower retaining gauges are large, the land acquisition cost and the retaining and protecting engineering cost are greatly increased are brought, meanwhile, the construction and excavation height of the lower retaining wall positioned on the steep slope section causes the large-area vegetation damage to cause the large-area water and soil loss, even landslides and other unfavorable geological disasters, and even the situation that the lower retaining wall is difficult to develop construction sometimes occurs.
In order to avoid a series of problems existing in the widening roads of parallel high-altitude steep slopes or river sections, the existing widening roads of steep slopes or river sections also adopt parallel unequal-height setting types, a retaining structure needs to be added between unequal heights in the upper unequal-height setting type and the lower unequal-height setting type, the land acquisition area may be effectively reduced sometimes, the risks of water and soil loss and landslide geological disasters are reduced, but a retaining engineering between the upper and lower width roads needs to be added, the upper and lower width dividing type has obvious disadvantages in the aspects of functional use, rescue and the like and the parallel high-altitude type, and the civil engineering investment scale is not necessarily reduced or is not reduced obviously enough. The method is limited by the slope collecting capacity of the existing supporting and retaining structure form, even if a section form with different heights in parallel in different amplitudes is adopted, the capacity is still insufficient in the aspects of reducing sign and separation, reducing investment, reducing water and soil loss and landslide land disaster risks, and the problem that the construction difficulty of the lower supporting and retaining structure on a steep slope or a river is large is not solved.
When an existing road is expanded or constructed around an existing building, a road retaining wall is often required to be arranged at the construction site. The common road retaining wall has large structure size and large foundation excavation, if an enlarged foundation or pile foundation is directly arranged beside an existing structure, a base plate is arranged on the foundation, and a wall body is arranged on the base plate. Because the wall body is close to the surrounding buildings, the foundation of the surrounding buildings or the attached buildings is easy to be disturbed, and the stability of the existing foundation is influenced.
The existing steep slope or expand along river highway section road, the existing road adds engineering such as slow-walking way, ride the way, view green track in parallel, all need to set up cast-in-place retaining structure in the road outside, cast-in-place barricade construction period is big to existing road traffic organization influence, the construction cycle is long, the quality is difficult to control, the cost of labor is high, be unfavorable for environmental protection and be subject to the climatic environment, consequently, research a new road expansion structural style, have to the existing traffic little influence, the quality is controllable, economic rationality, the short advantage of construction cycle awaits the solution at present urgently.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a road enlargement structure for when solving among the prior art road enlargement influence big and the big scheduling problem of the construction degree of difficulty existing traffic.
The embodiment of the utility model provides a road enlargement structure, include: prefabricating a wall body and a cantilever plate; the prefabricated wall body is arranged on the side face of the pavement of the road to be expanded; a shear groove is formed in the top of the prefabricated wall body; and the groove wall on one side of the shear groove is connected with the top of the prefabricated wall body, and one end of the prefabricated cantilever plate is inserted into the shear groove.
The end part of the prefabricated cantilever plate is pre-embedded with a plurality of connecting pieces which are sequentially arranged along the length direction of the prefabricated cantilever plate, and the connecting ends of the connecting pieces extend out of the end part of the prefabricated cantilever plate; the bottom of the shear groove is provided with a plurality of connecting holes, and the connecting end of each connecting piece is fastened in the corresponding connecting hole.
The prefabricated cantilever slab comprises at least two prefabricated slabs which are attached to each other; the surfaces of the prefabricated plates are provided with shear keys, and two adjacent prefabricated plates are connected through mutual matching of the shear keys.
The shear key comprises a concave shear key arranged on one prefabricated plate and a convex shear key arranged on the other prefabricated plate and connected with the concave shear key in a concave-convex matching manner.
Wherein, road extension structure, still include: bearing platform and road foundation; one side of the bearing platform is connected with the bottom of the prefabricated wall body, and the other side of the bearing platform is connected with the top of the road foundation.
Wherein the prefabricated wall comprises at least one layer of a first prefabricated sub-wall; a plurality of grouting holes are formed in the lower end of the side wall of the first prefabricated sub-wall body, and a plurality of bent pipes are arranged in the lower end of the first prefabricated sub-wall body; one end of the bent pipe is communicated with the grouting hole, and the other end of the bent pipe penetrates out of the lower end part of the first prefabricated sub-wall body, so that mortar flows to the lower end part of the first prefabricated sub-wall body through the grouting hole and the bent pipe.
A first prestressed pipeline is arranged in the bearing platform, and a second prestressed pipeline is arranged in the prefabricated wall; the first prestressed pipeline and the second prestressed pipeline are longitudinally arranged oppositely and are in through connection, the prestressed steel bundles penetrate through the first prestressed pipeline and the second prestressed pipeline, the fixed ends of the prestressed steel bundles are anchored in the bearing platform, and the tensioning ends of the prestressed steel bundles are anchored at the top of the prefabricated wall body.
And a first impermeable layer, a reversed filter layer and a second impermeable layer are sequentially arranged on one side of the prefabricated wall body, which is close to the pavement, from bottom to top.
The embodiment of the utility model provides a road extension structure, through adopting prefabricated wall body and prefabricated cantilever slab, make the other stage construction of factory prefabrication and scene can go on simultaneously, shorten the time limit for a project; the wall body and the cantilever plate are manufactured in a standardized manner in a factory, so that quality assurance is facilitated, and labor cost is reduced; the environment is protected, and the adaptability is stronger in complex climate and environment; the adoption of the cantilever plate structure reduces the occupied area, avoids building a lower retaining structure on a steep slope or a river side, reduces the scale and difficulty of the lower retaining, reduces the proportion of bridges, and has obvious advantages in earth and stone space, masonry blocking and protecting amount and land utilization scale; and the shear groove is adopted to connect the prefabricated wall body and the prefabricated cantilever slab, so that the bending moment resistance of the belt path can be enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a cross-sectional view of an embodiment of the road extension structure of the present invention;
fig. 2 is a longitudinal sectional view of an embodiment of the road extension structure of the present invention;
fig. 3 is a top view of an embodiment of the cantilever plate of the present invention;
FIG. 4 is an enlarged view of the position relationship between the bearing platform and the prefabricated wall body;
FIG. 5 is an enlarged view of an embodiment of the prefabricated wall of the present invention;
FIG. 6 is a cross-sectional view of section A-A shown in FIG. 5;
FIG. 7 is a cross-sectional view of the prestressed steel bundles in the prefabricated wall of the present invention;
fig. 8 is a cross-sectional view of the tension end of the prestressed steel strand of the present invention;
FIG. 9 is an enlarged view of a shear key formed by connecting two adjacent precast slabs in the precast cantilever slab of the present invention;
wherein, 1-road foundation; 2-a bearing platform; 3-preparing a sub-wall at the lower layer; 4-preparing the upper prefabricated sub-wall body; 5-prestressed steel bundles; 6-mortar cushion layer; 7-prefabricating a cantilever plate; 8-high strength bolts; 9-a shear groove; 10-convex shear key; 11-a railing; 12-an inverted filter layer; 13-a water drain pipe; 141-a first barrier layer; 142-a second barrier layer; 15-permeable geotextile; 16-road surface; 17-a steel backing plate; 18-a fixed end anchorage; 19-tensioning end anchorage; 20-settlement joint; 211-a first pre-stressed conduit; 212-a second pre-stressed conduit; 221-a first notch; 222-a second notch; 23-pipe segment dividing line; 24-a cushion cap top; 25-anchor backing plate; 26-concave shear key; 27-ground line; 28-grouting holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and 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 therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Fig. 1 shows the utility model discloses the cross sectional view of road extension structure, fig. 2 shows the utility model discloses the longitudinal section of road extension structure, as shown in fig. 1 and fig. 2, this road extension structure includes: prefabricating a wall body and a cantilever plate 7; the prefabricated wall is arranged on the side surface of a pavement 16 of a road to be expanded; a shear groove 9 is arranged at the top of the prefabricated wall body; one side groove wall of the shear groove 9 is connected with the top of the prefabricated wall, and one end of the prefabricated cantilever plate 7 is inserted into the shear groove 9.
Specifically, a prefabricated wall body is arranged on the side face of a road surface 16 of a road to be expanded, namely the prefabricated wall body and a prefabricated cantilever plate 7 are prefabricated before the road is expanded; the length of the prefabricated cantilever plate 7 can be determined according to the width of the road to be expanded, and the height of the prefabricated wall body can be determined by the installation ground line 27. And then hoisting the prefabricated wall to the side surface of the pavement 16 of the road to be expanded, wherein the setting position of the prefabricated wall can be determined according to the position of the road to be expanded. Then, a shear groove 9 is formed at the top of the prefabricated wall body, that is, the notch of the shear groove 9 is away from the road to be expanded, and one side groove wall of the shear groove 9 is connected with the top of the prefabricated wall body, for example, one side groove wall of the shear groove 9 is connected with the side, close to the pavement 16, of the top of the prefabricated wall body, for example, the two are connected through cement mortar. And the groove bottom of the shear groove 9 is connected with one end of the prefabricated cantilever plate 7, that is, the prefabricated cantilever plate 7 is transported to the top of the prefabricated wall body, and one end of the prefabricated cantilever plate 7 is inserted into the notch of the shear groove 9, so as to connect one end of the prefabricated cantilever plate 7 with the groove bottom of the shear groove 9, for example, the connection relationship between the two is fixed connection or detachable connection, and the like. Thus, a road extension structure can be formed, and the pre-fabricated cantilever plate 7 can form the extended road.
In the embodiment of the utility model, the prefabricated wall body and the prefabricated cantilever plate 7 are adopted, so that the factory prefabrication and the construction of other stages on site can be carried out simultaneously, and the construction period is shortened; the wall body and the cantilever plate are manufactured in a standardized manner in a factory, so that quality assurance is facilitated, and labor cost is reduced; the environment is protected, and the adaptability is stronger in complex climate and environment; the adoption of the cantilever plate structure reduces the occupied area, avoids building a lower retaining structure on a steep slope or a river side, reduces the scale and difficulty of the lower retaining, reduces the proportion of bridges, and has obvious advantages in earth and stone space, masonry blocking and protecting amount and land utilization scale; and the shear groove 9 is adopted to connect the prefabricated wall body with the prefabricated cantilever slab 7, so that the bending moment resistance of the belt path can be enhanced.
Further, as shown in fig. 3, a plurality of connecting pieces sequentially arranged along the length direction of the prefabricated cantilever plate 7 are pre-embedded in the end of the prefabricated cantilever plate 7, and the connecting ends of the connecting pieces extend out of the end of the prefabricated cantilever plate 7; the bottom of the shear groove 9 is provided with a plurality of connecting holes, and the connecting end of each connecting piece is fastened in the corresponding connecting hole.
Specifically, in the process of prefabricating the cantilever plate 7, a plurality of connecting pieces, such as high-strength bolts 8, prestressed reinforcements or thick reinforcements, need to be pre-embedded in the prefabricated cantilever plate 7 in advance; the connecting member is taken as an example of the high-strength bolt 8, but the invention is not limited to the protection scope of the invention. The prestress and the length of the high-strength bolt 8 can be determined according to the stress condition on the prefabricated cantilever plate 7; the plurality of high-strength bolts 8 are sequentially arranged at the end part of the prefabricated cantilever plate 7 along the length direction of the prefabricated cantilever plate 7, and the connecting end of each high-strength bolt 8 extends out of the end part of the prefabricated cantilever plate 7. Correspondingly, when the shear groove 9 is constructed, a plurality of connecting holes (namely, the connecting holes are bolt holes) are reserved at the bottom of the shear groove 9, and the bolt holes correspond to the high-strength bolts 8 one by one; after the prefabrication of the prefabricated cantilever plate 7 is completed, when the prefabricated cantilever plate 7 is hoisted to the upper part of the prefabricated wall body, the connecting end of the high-strength bolt 8 is opposite to the notch of the shear groove 9, the connecting end of the high-strength bolt 8 can be fixed in a reserved bolt hole on the shear groove 9, namely, the connecting end of the high-strength bolt 8 passes through the bolt hole, a steel backing plate 17 can be arranged at the connecting end of the high-strength bolt 8, and then a nut is screwed at the connecting end of the high-strength bolt 8; namely, the end part of the high-strength bolt 8 penetrating through the bolt hole is sequentially provided with a steel backing plate 17 and a nut.
In this embodiment, the connecting piece is arranged in the prefabricated cantilever plate 7, and the connecting hole is reserved at the bottom of the shear groove 9, so that the connecting end of the connecting piece is fastened in the corresponding connecting hole, the prefabricated cantilever plate 7 is connected with the shear groove 9, the stress capacity of the prefabricated cantilever plate 7 is improved, and the stability of the road extension structure is improved.
Further, the prefabricated cantilever slab 7 comprises at least two prefabricated slabs attached to each other; the surfaces of the prefabricated plates are provided with shear keys, and two adjacent prefabricated plates are connected through mutual matching of the shear keys. For example, the prefabricated cantilever slab 7 comprises three prefabricated slabs attached to each other, as shown in fig. 1 and 2, for example, the three prefabricated slabs attached to each other are named as a first prefabricated slab, a second prefabricated slab and a third prefabricated slab from top to bottom in sequence; the plate surfaces on the two sides of the second prefabricated plate are provided with the shear keys, and the first prefabricated plate and the third prefabricated plate only need to be provided with the shear keys on one plate surface, for example, the shear keys are concave-convex matched shear keys. For example, a convex shear key is arranged on one side plate surface of the first prefabricated plate, a concave shear key is arranged on the plate surface of the second prefabricated plate attached to the first prefabricated plate, a convex shear key is arranged on the plate surface of the second prefabricated plate attached to the third prefabricated plate, and a concave shear key is arranged on one side plate surface of the third prefabricated plate; or a concave shear key is arranged on the plate surface on one side of the first prefabricated plate, a convex shear key is arranged on the plate surface of the second prefabricated plate, which is attached to the first prefabricated plate, a concave shear key is arranged on the plate surface of the second prefabricated plate, which is attached to the third prefabricated plate, and a convex shear key is arranged on the plate surface on one side of the third prefabricated plate; namely, as long as two adjacent prefabricated plates are connected in a matching way through the concave-convex shear keys, the arrangement form of the concave-convex shear keys can be randomly arranged. Namely, the shear key arranged on the plate surfaces of two adjacent prefabricated plates is in the form of a matched arrangement of a convex shear key 10 and a concave shear key 26, as shown in fig. 9. The shear keys on two adjacent prefabricated plates are connected in a matching way, namely the convex shear key 10 on one prefabricated plate is clamped into the concave shear key 26 on the other prefabricated plate, and the two prefabricated plates can be jointed together by the arrangement; for example, an epoxy resin layer may be disposed on the surface of the shear key, that is, the epoxy resin layer is coated on the surface of the shear key, so that the shear key can be well bonded together.
In the embodiment, two adjacent prefabricated slabs in the prefabricated cantilever slab 7 are connected through the concave-convex shear key 10, so that the stress capacity of the prefabricated cantilever slab 7 at the slab end is increased.
Further, road extension structure still includes: a bearing platform 2 and a road foundation 1; one side of the bearing platform 2 is connected with the bottom of the prefabricated wall body, and the other side of the bearing platform 2 is connected with the top of the road foundation 1. For example, a construction platform is constructed on site, a road foundation 1 is excavated and constructed at the position where the road foundation 1 is arranged on the road to be expanded, a bearing platform 2 is arranged on the top surface of the road foundation 1 after the pouring of the road foundation 1 is completed, and the bearing platform top 24 is connected with the bottom of the prefabricated wall body.
Further, as shown in fig. 2, the prefabricated wall includes at least one layer of first prefabricated sub-wall, the lower end of the sidewall of the first prefabricated sub-wall is provided with a plurality of grouting holes 28, and the lower end of the first prefabricated sub-wall is provided with a plurality of bent pipes; one end of the bent pipe is communicated with the grouting hole 28, and the other end of the bent pipe penetrates out of the lower end part of the first prefabricated sub-wall body, so that mortar flows to the lower end part of the first prefabricated sub-wall body through the grouting hole 28 and the bent pipe.
For example, the height and length of the prefabricated wall body prefabricated in stages can be determined according to the hoisting capacity of the construction equipment, that is, the number of layers of the first prefabricated sub-wall body required by the prefabricated wall body can be determined, and the height and length of the first prefabricated sub-wall body can be determined. It is of course also possible to design the first prefabricated sub-walls in a number of different shapes according to the specifications of the road to be expanded so that the prefabricated sub-walls can be connected to the side of the pavement 16 of the road to be expanded. In this embodiment, the prefabricated wall includes two layers of the first prefabricated sub-wall, which is not intended to limit the scope of the present invention. For example, the two layers of first prefabricated sub-walls are respectively the lower layer prefabricated sub-wall 3 and the upper layer prefabricated sub-wall 4, that is, the bottom of the lower layer prefabricated sub-wall 3 is connected with the bearing platform top 24, the top of the lower layer prefabricated sub-wall 3 is connected with the bottom of the upper layer prefabricated sub-wall 4, and the top of the upper layer prefabricated sub-wall 4 is connected with one side groove wall of the shear groove 9, for example, the connection relationship is that a mortar layer is used for connection, etc.
For example, a plurality of grouting holes 28 are formed in the lower end of the side wall of the lower prefabricated sub-wall 3 and the lower end of the side wall of the upper prefabricated sub-wall 4, for example, the grouting holes 28 in the lower prefabricated sub-wall 3 are sequentially arranged along the length direction of the grouting holes, and the grouting holes 28 in the upper prefabricated sub-wall 4 are also sequentially arranged along the length direction of the grouting holes. And, there are many bend pipes in the lower end of the lower prefabricated sub-wall 3 and in the lower end of the upper prefabricated sub-wall 4, for example, the bend pipes in the lower end of the lower prefabricated sub-wall 3 are set up sequentially along their own length direction, for example, the number of the bend pipes is the same as the number of the grouting holes 28, of course, as long as the mortar can flow to the lower end of the lower prefabricated sub-wall 3 through the grouting holes 28 and the bend pipes, the number of the bend pipes and the number of the grouting holes 28 may also be different; for example, two or three equal grout holes 28 share a bend. I.e., the mortar flowed to the lower end portion of the lower prefabricated sub-wall 3, and a mortar bed 6 is formed between the lower end portion of the lower prefabricated sub-wall 3 and the bearing cap top 24, i.e., the mortar bed 6 connects the lower prefabricated sub-wall 3 and the bearing cap top 24.
For example, the bent pipes in the lower end part of the upper prefabricated sub-wall 4 are arranged in sequence along the length direction of the bent pipes, for example, the number of the bent pipes is consistent with the number of the grouting holes 28, that is, one grouting hole 28 is communicated with one bent pipe; certainly, as long as mortar can flow to the lower end part of the upper prefabricated sub-wall body 4 through the grouting holes 28 and the bent pipes, the number of the bent pipes and the number of the grouting holes 28 may not be the same; for example, two or three equal grout holes 28 share a bend. I.e., the mortar flowing to the lower end of the upper prefabricated sub-wall 4, and a mortar bed 6 is formed between the lower end of the upper prefabricated sub-wall 4 and the upper end of the lower prefabricated sub-wall 3, i.e., the mortar bed 6 connects the upper prefabricated sub-wall 4 with the lower prefabricated sub-wall 3. When the number of layers of the first prefabricated sub-wall body changes, the first prefabricated sub-wall body can be assembled according to the arrangement mode until the height of the prefabricated wall body is close to the road surface 16.
Further, as shown in fig. 4 to 6, a first prestressed pipe 211 is arranged in the bearing platform 2, and a second prestressed pipe 212 is arranged in the prefabricated wall; the first prestressed pipeline 211 and the second prestressed pipeline 212 are longitudinally arranged oppositely and are in through connection, the prestressed steel beam 5 penetrates through the first prestressed pipeline 211 and the second prestressed pipeline 212, the fixed end of the prestressed steel beam 5 is anchored in the bearing platform 2, and the tensioning end of the prestressed steel beam 5 is anchored at the top of the prefabricated wall. For example, in the process of pouring the bearing platform 2, a first prestressed pipe 211 is pre-buried at a position where the prestressed steel beam 5 needs to penetrate into the bearing platform 2, for example, a first notch 221 is reserved at a position where the first prestressed pipe 211 is pre-buried inside the bearing platform 2; in addition, a pipe section boundary 23 can be embedded between the second prestressed pipe 212 in the lower prefabricated sub-wall 3 and the first prestressed pipe 211 of the bearing platform 2. The first pre-stressed conduit 211 is then inserted into the first slot 221; anchoring the fixed end of the prestressed steel strand 5 in the bearing platform 2, for example, anchoring the fixed end of the prestressed steel strand 5 in the bearing platform 2 by using a fixed-end anchorage 18; the pre-stressed steel strand 5 is then passed through a first pre-stressed pipe 211 in the platform 2.
For example, the second pre-stressed pipe 212 is pre-embedded at a corresponding position in the prefabricated wall body prefabricated in the factory, for example, the second pre-stressed pipe 212 is pre-embedded at a position penetrating through the pre-stressed steel beam 5 in the lower prefabricated sub-wall body 3 and the upper prefabricated sub-wall body 4, and then the second pre-stressed pipe 212 is inserted into the second notch 222; in addition, a pipe section dividing line 23 can be pre-buried between the second pre-stressed pipe 212 in the lower prefabricated sub-wall 3 and the second pre-stressed pipe 212 in the upper prefabricated sub-wall 4. The prestressed steel strand 5 passing through the first prestressed pipe 211 passes through the second prestressed pipe 212 again, and after tensioning of the prestressed steel strand 5 is completed, the tensioning end of the prestressed steel strand 5 is fixed at the top of the prefabricated wall body, as shown in fig. 7; for example, the tensioned ends of the prestressed steel strands 5 are fixed on the top of the prefabricated sub-wall 4 on the upper layer, for example, tensioning end anchors 19 are used for anchoring the tensioned ends of the prestressed steel strands 5 on the top of the prefabricated sub-wall 4 on the upper layer; for example, the tensioned end of the prestressed steel strand 5 is anchored using an anchor pad 25, as shown in fig. 8. Thereafter, the first and second pre-stressed pipes 211 and 212 may be grouted; for example, the first pre-stressed conduit 211 and the second pre-stressed conduit 212 are in a straight line.
In the embodiment, the prestressed steel beams 5 are arranged in the bearing platform 2 and the prefabricated wall body, so that the construction safety of the prefabricated wall body is ensured, and the safety of a road structure is ensured.
In addition, a drain pipe 13 may be provided at the lower end portion of the lower prefabricated sub-wall 3, and the drain pipe 13 is, for example, a PVC drain pipe 13. In addition, after the strength of the prefabricated wall body reaches the designed strength, a first impermeable layer 141, a reversed filter layer 12 and a second impermeable layer 142 can be applied on one side of the prefabricated wall body close to the road surface 16 in a layered manner, namely, the first impermeable layer 141, the reversed filter layer 12 and the second impermeable layer 142 are sequentially applied along the height direction of the prefabricated wall body from bottom to top; and the permeable soil publication 15 is applied while the first impermeable layer 141, the inverted filter layer 12 and the second impermeable layer 142 are applied, namely the permeable soil publication 15 is correspondingly applied to one side of the first impermeable layer 141, which is far away from the prefabricated wall body, the permeable soil publication 15 is correspondingly applied to one side of the inverted filter layer 12, which is far away from the prefabricated wall body, and the permeable soil publication 15 is correspondingly applied to one side of the second impermeable layer 142, which is far away from the prefabricated wall body, until the height of the permeable soil publication 15 is consistent with that of the prefabricated wall body.
In addition, in the prefabrication process of the prefabricated cantilever plate 7, a railing 11 base can be embedded at the end part, far away from the shear groove 9, of the prefabricated cantilever plate 7, and after the prefabricated cantilever plate 7 and the prefabricated wall are installed, the prefabricated cantilever can be paved and installed with a railing 11 and the like.
The embodiment of the utility model provides a road enlargement structure compares the advantage with current abrupt slope or the district road structural style that is close to the river and is showing:
1. compared with the conventional retaining structure: the prefabricated wall body and the prefabricated cantilever plate are both assembled, and factory prefabrication and construction at other stages on site can be carried out simultaneously, so that the construction period is shortened; the standardized manufacture of a factory is beneficial to quality guarantee, and the labor cost is reduced; the environment is protected, and the adaptability under complex climate and environment is stronger;
2. compared with the structural form of a parallel equal-height road in a steep slope section: the prefabricated cantilever plate structure is adopted, so that the occupied land is reduced, the construction of a retaining structure on a steep slope or a river side is avoided, the retaining scale and difficulty are reduced, the bridge occupation ratio is reduced, and the advantages in earth and stone space, masonry blocking and protecting amount and land utilization scale are obvious;
3. compared with the parallel unequal-height double-lower-gear road structure form: the parallel equal-height advantage is achieved in the aspects of functional use and rescue, the excavation of a slope body in a steep slope section is avoided, the excavation amount and the lower support gauge are reduced, the support measure between an upper road and a lower road is omitted, the bridge occupation ratio is reduced, and the advantages in the aspects of earth and stone space, the masonry blocking and protecting amount and the expropriation ground gauge are obvious;
4. compared with a half-bridge road structure form: the advantages are more obvious, the bridge occupation ratio is directly reduced, and the investment cost is obviously reduced.
The utility model also provides a road extension method, include: hoisting the prefabricated wall body to the side surface of a pavement 16 of a road to be expanded, and constructing a shear groove 9 at the top of the prefabricated wall body so as to connect the groove wall of the shear groove 9 with the top of the prefabricated wall body; and hoisting the prefabricated cantilever plate 7 to the top of the prefabricated wall body, and inserting one end of the prefabricated cantilever plate 7 into the shear groove 9.
Further, the road extension method further comprises the following steps: a plurality of high-strength bolts 8 which are sequentially arranged along the length direction of the prefabricated cantilever plate 7 are embedded in the end part of the prefabricated cantilever plate 7, a plurality of bolt holes are reserved at the bottom of a shear groove 9, and the connecting ends of the high-strength bolts 8 are fixed at the bolt holes; and shear keys are arranged on the plate surfaces of the prefabricated plates attached to each other in the prefabricated cantilever plate 7, and the shear keys on two adjacent prefabricated plates are connected in a matching way.
Further, the road extension method further comprises the following steps: constructing a road foundation 1 and a bearing platform 2 at a road to be expanded so as to connect the bottom of the prefabricated wall body with one side of the bearing platform 2 and connect the other side of the bearing platform 2 with the road foundation 1; pre-burying a first prestressed pipeline 211 in the bearing platform 2, and pre-burying a second prestressed pipeline 212 in the prefabricated wall body; the prestressed steel strand 5 sequentially passes through the first prestressed pipe 211 and the second prestressed pipe 212, the fixed end of the prestressed steel strand 5 is anchored in the bearing platform 2, and the tensioning end of the prestressed steel strand 5 is anchored at the top of the prefabricated wall.
Specifically, firstly, the length of the prefabricated cantilever plate 7 and the arrangement position of the prefabricated wall body are determined according to the width of the road extension, and the height of the prefabricated wall body is determined according to the longitudinal ground line 27; and then determining the height and the length of the prefabricated wall body prefabricated in stages according to the construction hoisting capacity, namely determining the height and the length of the first prefabricated sub-wall body. In addition, the prefabricated cantilever plate 7 can be prefabricated in blocks according to the distance between the prefabricated wall settlement joints 20. Secondly, prefabricating the first prefabricated sub-wall body and the prefabricated cantilever plate 7 in a factory according to the size of the first prefabricated sub-wall body and the prefabricated cantilever plate, and embedding a second prestressed pipeline 212 at the arrangement position of the prestressed steel beam 5 in the process of prefabricating the first prefabricated sub-wall body in the factory; high-strength bolts 8 are pre-buried in the prefabricated cantilever plates 7, and concave-convex shear keys 10 are respectively arranged at the beam ends of the prefabricated plates in the prefabricated cantilever plates 7 according to design requirements.
Meanwhile, a construction platform can be constructed on site, the road foundation 1 is excavated at the position where the road foundation 1 is arranged at the position of the road to be expanded, the bearing platform 2 is poured at the top of the road foundation 1 after the pouring of the road foundation 1 is finished, the position of the prestressed steel beam 5 is arranged in the bearing platform 2, the first prestressed pipeline 211 and the fixed-end anchorage 18 are pre-embedded, and the prestressed steel beam 5 sequentially passes through the first prestressed pipeline 211 and the second prestressed pipeline 212. Thirdly, transporting the prefabricated first prefabricated sub-wall body to a construction site, firstly hoisting the lower prefabricated sub-wall body 3, pouring high-performance mortar through a grouting hole 28 in the lower prefabricated sub-wall body 3 after the prefabricated first prefabricated sub-wall body is installed in place, simultaneously installing the prestressed steel bundle 5 to penetrate through a second prestressed pipeline 212 in the lower prefabricated sub-wall body 3, and embedding a drain pipe 13 (for example, the drain pipe 13 is a PVC drain pipe 13) at the lower end part of the lower prefabricated sub-wall body 3; then, hoisting the prefabricated sub-wall bodies 4 on the upper layer, after the prefabricated sub-wall bodies 3 on the upper layer and the lower layer are aligned and installed, pouring high-performance mortar through grouting holes 28 in the prefabricated sub-wall bodies 4 on the upper layer to complete segmental assembly; if there is still a next section of the first prefabricated sub-wall, the installation can be repeated as described above until the road surface 16 is reached.
Then, installing a tensioning end anchorage 19 at the top of the upper prefabricated sub-wall body 4, and grouting the prestressed pipeline after tensioning the prestressed steel bundles 5; after the upper prefabricated sub-wall 4 and the lower prefabricated sub-wall 3 reach the designed strength, a first impermeable layer 141, a reversed filter layer 12 and a second impermeable layer 142 are applied on one side of the whole prefabricated wall close to the road surface 16 in a layered manner, and corresponding permeable soil publications 15 are applied at the same time; thereafter, the fill is compacted until the design height. Then, constructing a shear groove 9 at the wall top of the prefabricated wall body, and reserving bolt holes and steel backing plates 17 at the groove bottom of the shear groove 9; and then, the prefabricated cantilever plate 7 which is prefabricated in advance can be transported to a construction site, and after the high-strength bolt 8 penetrates through the bolt hole in the shear groove 9, a nut is screwed on one side, away from the bolt hole, of the steel backing plate 17, so that the prefabricated cantilever plate 7 is installed. Finally, the prefabricated wall body can be constructed on the wall top as a road bed pavement 16; and paving the prefabricated cantilever plate 7, and installing a railing 11 and the like at the end part of the prefabricated cantilever plate 7.
In the embodiment, the road to be expanded is expanded by the road expansion method, the factory production and the assembly construction are adopted, the structure and the construction are simple, and the expansion structure occupies a small area and is attractive in structure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. A road extension structure, comprising: prefabricating a wall body and a cantilever plate;
the prefabricated wall body is arranged on the side face of the pavement of the road to be expanded; a shear groove is formed in the top of the prefabricated wall body;
and the groove wall on one side of the shear groove is connected with the top of the prefabricated wall body, and one end of the prefabricated cantilever plate is inserted into the shear groove.
2. The road extension structure according to claim 1, wherein a plurality of connecting pieces are pre-embedded at the end part of the prefabricated cantilever plate and sequentially arranged along the length direction of the prefabricated cantilever plate, and the connecting ends of the connecting pieces extend out of the end part of the prefabricated cantilever plate;
the bottom of the shear groove is provided with a plurality of connecting holes, and the connecting end of each connecting piece is fastened in the corresponding connecting hole.
3. The road extension structure according to claim 1, wherein the prefabricated cantilever slab comprises at least two prefabricated slabs attached to each other;
the surfaces of the prefabricated plates are provided with shear keys, and two adjacent prefabricated plates are connected through mutual matching of the shear keys.
4. The road extension structure of claim 3, wherein the shear key comprises a concave shear key provided on one of the prefabricated panels and a convex shear key provided on the other prefabricated panel and in male-female fit connection with the concave shear key.
5. The road extension structure according to claim 1, further comprising: bearing platform and road foundation;
one side of the bearing platform is connected with the bottom of the prefabricated wall body, and the other side of the bearing platform is connected with the top of the road foundation.
6. The road extension structure according to claim 1, wherein the prefabricated wall comprises at least one layer of a first prefabricated sub-wall;
a plurality of grouting holes are formed in the lower end of the side wall of the first prefabricated sub-wall body, and a plurality of bent pipes are arranged in the lower end of the first prefabricated sub-wall body;
one end of the bent pipe is communicated with the grouting hole, and the other end of the bent pipe penetrates out of the lower end part of the first prefabricated sub-wall body, so that mortar flows to the lower end part of the first prefabricated sub-wall body through the grouting hole and the bent pipe.
7. The road extension structure according to claim 5, wherein a first pre-stressed conduit is provided in the cap, and a second pre-stressed conduit is provided in the prefabricated wall;
the first prestressed pipeline and the second prestressed pipeline are longitudinally arranged oppositely and are in through connection, the prestressed steel bundles penetrate through the first prestressed pipeline and the second prestressed pipeline, the fixed ends of the prestressed steel bundles are anchored in the bearing platform, and the tensioning ends of the prestressed steel bundles are anchored at the top of the prefabricated wall body.
8. The road extension structure according to any one of claims 1-7, wherein a first impermeable layer, a reverse filter layer and a second impermeable layer are sequentially arranged on one side of the prefabricated wall body close to the road surface from bottom to top.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109750567A (en) * | 2019-01-29 | 2019-05-14 | 中铁第四勘察设计院集团有限公司 | Expressway extension structure and expressway extension method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109750567A (en) * | 2019-01-29 | 2019-05-14 | 中铁第四勘察设计院集团有限公司 | Expressway extension structure and expressway extension method |
| CN109750567B (en) * | 2019-01-29 | 2023-11-10 | 中铁第四勘察设计院集团有限公司 | Road extension structure and road extension method |
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