CN217174219U

CN217174219U - Prestressing force fill roadbed structure under soft basic soil property condition

Info

Publication number: CN217174219U
Application number: CN202220145403.5U
Authority: CN
Inventors: 王安文
Original assignee: Road and Bridge International Co Ltd
Current assignee: Road and Bridge International Co Ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-08-12
Anticipated expiration: 2032-01-19

Abstract

The utility model relates to a prestressing force fill roadbed structure under soft basic soil property condition, the following one row of cement mixing stake of establishing along the roadbed transverse interval of road bed horizontal interval of road bed on the former ground line of road bed, embankment both sides side slope full-page multilayer concrete prefabricated section, it establishes a lower floor's prestressing tendons along the roadbed transverse interval to be close to the embankment bottom, the prefabricated section of side slope both sides lower floor is passed respectively at lower floor's prestressing tendons both ends and is passed through the nut anchor, a layer of concrete apron is pour to the embankment top surface, the apron both sides are pour as an organic wholely with the prefabricated section of side slope both sides the superiors respectively, an upper prestressed tendons is transversely worn to establish along the roadbed at every interval in the concrete apron. The utility model discloses a horizontal force after the vertical load that the embankment bore is resisted to the prestressing force of embankment top bottom decomposes has the dual function of firm embankment and side slope, guarantees road operation safety.

Description

Prestressing force fill roadbed structure under soft basic soil property condition

Technical Field

The utility model belongs to the technical field of the road construction, a fill roadbed structure is related to, concretely relates to prestressing force fill roadbed structure under soft basic soil property condition.

Background

The highway subgrade is designed to be higher than the road section of the original ground, needs filling construction, is called as a embankment, is generally filled with a layer of compacted layer, and is finally assisted with pavement. When the roadbed is constructed under the condition of soft foundation soil, because the bearing capacity of the roadbed is low, the roadbed is easy to subside after being operated for a period of time, and meanwhile, the side slope of the embankment is easy to collapse, so that potential safety hazards are brought to vehicle passing.

Disclosure of Invention

The utility model aims at the above-mentioned problem, a prestressing force fill roadbed structure under soft basic soil property condition is provided, prevents that the road bed from subsiding, guarantees road operation safety.

The technical scheme of the utility model as follows:

the utility model provides a prestressing force fill roadbed structure under soft matrix soil property condition which characterized in that: arranging a row of cement mixing piles at certain intervals along the transverse direction of the roadbed below the original ground line of the roadbed; the embankment both sides side slope is full of concrete prefabricated section, the prefabricated section is arranged along the toe of a slope to the top of a slope branch multilayer, is close to the embankment bottom and establishes a lower floor's prestressing tendons along the horizontal every fixed interval of road bed, and lower floor's prestressing tendons both ends pass the prefabricated section of the bottom floor of side slope both sides respectively and through the nut anchor, and a layer concrete cover is pour to the embankment top surface, and concrete cover both sides are pour as an organic whole with the prefabricated section of side slope both sides superiors respectively, and every fixed interval transversely wears to establish an upper prestressed tendons along the road bed in the concrete cover, and upper prestressing tendons both ends are respectively through the nut anchor.

The utility model reduces foundation settlement through the cement mixing pile, adopts the slope precast block to stabilize the embankment, prevents the slope from collapsing, resists the horizontal force after the vertical load born by the embankment is decomposed through the prestress of the bottom layer of the embankment top, and has the double functions of stabilizing the embankment and the slope; the safety of road operation is guaranteed. The side slope prefabricated section can be manufactured in a factory, the quality can be guaranteed, and the installation speed is high.

Drawings

Fig. 1 is a cross-sectional view of the present invention taken along the lateral direction of the roadbed;

fig. 2 is a side view of the present invention along the longitudinal direction of the roadbed;

FIG. 3 is a schematic plan view of a side slope protection prefabricated section;

FIG. 4 is a schematic side view of a slope protection prefabricated section;

FIG. 5 is a side view of a connection structure of a slope protection precast block;

fig. 6 is a plan view of a connection structure of the side slope protection precast block.

Detailed Description

As shown in fig. 1 and 2, the utility model discloses establish one row of cement mixing stake 1 along the horizontal every other constant distance of roadbed below the road bed ground plane, 2 both sides side slopes of embankment are full of concrete prefabricated section 3, prefabricated section 3 is divided multilayer arrangement to the bottom of the slope along the toe of the slope, is close to the embankment bottom and establishes a lower floor's prestressing tendons 4 along the horizontal every constant distance of roadbed, and lower floor's prestressing tendons both ends are passed the prefabricated section of the bottom floor of side slope both sides respectively and are passed through the nut anchor, and a layer of concrete cover plate 5 is pour to embankment top surface, and concrete cover plate 5 both sides are pour as an organic wholely with the prefabricated section 3 of side slope both sides the superiors respectively, and an upper prestressing tendons 6 is transversely worn to establish along the roadbed at every constant distance in the concrete cover plate, and upper prestressing tendons both ends are respectively through the nut anchor.

The utility model discloses during the concrete implementation, upper prestressed tendons and lower floor's prestressed tendons all adopt the finish rolling screw-thread steel. In order to facilitate the installation of the lower prestressed tendons, through holes can be preset on the precast blocks 3 positioned at the lowest layer of the side slope, and two ends of the lower prestressed tendons 4 penetrate through the through holes in the precast blocks at the lowest layer of the side slope at two sides respectively and penetrate through wedge-shaped cushion blocks 7 and bolt connection anchoring nuts 8.

As shown in fig. 3 and 4, the utility model discloses during the implementation, prefabricated section 3 can set up to the rectangle structure, wherein establishes a notch 31 in the middle of the prefabricated section base of the superiors, the prefabricated section topside of the lowest floor and the topside and the base of all the other each layer prefabricated sections respectively, is equipped with two piece at least splice bars 32 along the direction on perpendicular to topside and base in every prefabricated section, the splice bar adopts finish rolling screw-thread steel, and certain length in notch 31 is outstanding to the tip of every splice bar 32. Fig. 3 and 4 show the structure of the precast block in the middle of the side slope, the top edge and the bottom edge are both provided with notches, the precast block at the uppermost layer and the precast block at the lowermost layer of the side slope are only provided with notches at the bottom edge or the top edge, and the rest of the structure is the same as the middle precast block.

As shown in fig. 5 and 6, the notches 31 and the connecting ribs 32 in the notches of the prefabricated sections 3 adjacent up and down on each side slope are opposite, and the opposite connecting ribs 32 in the two opposite notches are connected through the double-headed nut 9. Above-mentioned structure can be connected the prefabricated section on the side slope as an organic whole, prevents that the prefabricated section from outwards shifting or collapsing when receiving the horizontal tension of embankment. The purpose of the notch is to facilitate the operation of connecting the connecting ribs of the two prefabricated sections.

When the utility model is used, the cement mixing pile is firstly constructed under the original ground before the embankment is filled so as to enhance the bearing capacity and stability of the foundation, then filling and compacting the embankment layer by layer, mounting lower-layer prestressed tendons close to the bottom of the embankment during filling, uniformly manufacturing the precast blocks in a precast yard and transporting the precast blocks to a road construction site, after the embankment is formed, the precast blocks are installed from the slope toe to the slope top, the upper and lower adjacent precast blocks are connected by the double-end nut through the connecting rib during installation, after the installation of the precast blocks is completed, the precast blocks at the lowest layer of the side slopes at two sides are tensioned through the prestressed ribs at the lower layer, then, a concrete cover plate is cast on the top of the embankment in situ to be used as a base layer of the roadbed, a pvc pipe is preset in the concrete during casting and an upper layer prestressed tendon is penetrated through the pvc pipe, after the concrete reaches the design strength, and the upper prestressed tendons are tensioned and anchored by nuts, so that the bearing capacity of the roadbed cover plate is increased and the side slope precast blocks are stabilized.

Claims

1. The utility model provides a prestressing force fill roadbed structure under soft matrix soil property condition which characterized in that: arranging a row of cement mixing piles at certain intervals along the transverse direction of the roadbed below the original ground line of the roadbed; the embankment both sides side slope is full of concrete prefabricated section, the prefabricated section divides the multilayer arrangement to the summit along the toe of slope, is close to the embankment bottom and establishes a lower floor's prestressing tendons along the horizontal every uniform spacing of road bed, and lower floor's prestressing tendons both ends pass the bottom layer's of side slope both sides prefabricated section respectively and through the nut anchor, and a layer concrete cover plate is pour to the embankment top surface, and concrete cover plate both sides are pour as an organic wholely with the prefabricated section of side slope both sides superiors respectively, and every uniform spacing transversely wears to establish an upper prestressed tendons along the road bed in the concrete cover plate, and upper prestressing tendons both ends are respectively through the nut anchor.

2. The prestressed filled roadbed structure under the condition of soft foundation soil of claim 1, wherein: the precast block at the lowest layer of the embankment side slope is provided with a through hole in advance, and two ends of the prestressed tendon at the lower layer respectively penetrate through the through holes in the precast blocks at the lowest layer of the side slopes at two sides and are provided with wedge-shaped cushion blocks in a penetrating mode and anchor nuts in a threaded mode.

3. The prestressed filled roadbed structure under the condition of soft foundation soil of claim 1, wherein: the prefabricated blocks are of rectangular structures, wherein the bottom edges of the prefabricated blocks on the uppermost layer, the top edges of the prefabricated blocks on the lowermost layer and the middles of the top edges and the bottom edges of the prefabricated blocks on the other layers are respectively provided with a notch, at least two connecting ribs are arranged in each prefabricated block along the direction vertical to the top edges and the bottom edges, and the end part of each connecting rib protrudes into the notch for a certain length; the notch on the adjacent prefabricated section about on the slope and the splice bar in the notch are relative, and double-phase relative splice bar in the notch passes through double-end nut to be connected.