CN220789280U

CN220789280U - High roadbed reinforcing structure of filling of existing tubular pile of soft soil foundation

Info

Publication number: CN220789280U
Application number: CN202322467948.5U
Authority: CN
Inventors: 姬付全; 杨钊; 陈培帅; 朱涛; 罗会武; 张瑞元; 邓志强; 钟毓; 喻成成; 李德杰
Original assignee: CCCC Second Harbor Engineering Co
Current assignee: CCCC Second Harbor Engineering Co
Priority date: 2023-09-12
Filing date: 2023-09-12
Publication date: 2024-04-16
Anticipated expiration: 2033-09-12

Abstract

The utility model discloses a roadbed reinforcing structure for a soft soil foundation with existing tubular piles, which comprises the following components: the pile comprises a raw pipe pile with a pile cap, a steel flower pipe, a grouting reinforcement layer, a raft, a foam lightweight soil layer, a concrete cushion layer and a pavement layer; the steel pipe is installed in the pore-forming between the former tubular pile, fix through slip casting reinforcement layer between steel pipe and the pore-forming and form miniature stake, miniature stake top, former tubular pile top are connected into a whole through the raft, be provided with foam lightweight soil layer on the raft, be provided with concrete cushion on the foam lightweight soil layer, be provided with the road surface layer on the concrete cushion. The utility model has the foundation reinforcement with relatively low construction cost and consideration of the bearing capacity of the original tubular pile.

Description

High roadbed reinforcing structure of filling of existing tubular pile of soft soil foundation

Technical Field

The utility model relates to the field of foundation reinforcement in the operation period of road engineering. More particularly, the utility model relates to a roadbed reinforcing structure with high filling of existing tubular piles for soft soil foundations.

Background

At present, the deep silt in coastal areas is widely distributed, and the soft foundation sections of the roads are reinforced by the multi-design pipe piles in consideration of construction period requirements; the scale of the aquaculture market in coastal areas is large, and the aquaculture market is an area economic support industry; the periphery of the highway is often distributed with a large number of fishponds, the fishponds are dried in the sun periodically, and the fishpond stalks are dug and repaired and the pond sludge is cleared, so that the load and the water level of the roadbed are repeatedly changed, the roadbed is subjected to uneven settlement, soil between piles is settled, the pipe piles are driven to deflect, part of the pipe piles are invalid, and the bearing capacity of the roadbed is insufficient.

Disclosure of Invention

The utility model aims to provide a foundation reinforcement structure with a soft foundation and high filling capacity of existing tubular piles, which is relatively low in construction cost and takes the bearing capacity of the original tubular piles into consideration.

The technical scheme adopted by the utility model for solving the technical problem is as follows: the utility model provides an existing tubular pile high fill roadbed reinforced structure of weak soil foundation, its characterized in that includes: the pile comprises a raw pipe pile with a pile cap, a steel flower pipe, a grouting reinforcement layer, a raft, a foam lightweight soil layer, a concrete cushion layer and a pavement layer;

the steel pipe is installed in the pore-forming between the former tubular pile, fix through slip casting reinforcement layer between steel pipe and the pore-forming and form miniature stake, miniature stake top, former tubular pile top are connected into a whole through the raft, be provided with foam lightweight soil layer on the raft, be provided with concrete cushion on the foam lightweight soil layer, be provided with the road surface layer on the concrete cushion.

Preferably, the original pipe pile comprises an effective pipe pile and a failure pipe pile;

and forming holes in gaps among the effective tubular piles to install the steel floral tubes, and encrypting and installing the steel floral tubes in gaps among the invalid tubular piles.

Preferably, the pile cap and the mini pile are internally provided with the ribs, and are connected with the raft plate into a whole through the ribs; the raft is of a reinforced concrete structure.

Preferably, the foamed lightweight soil layer is composed of a plurality of first foamed lightweight soil layers from bottom to top, and the thickness of each first foamed lightweight soil layer is not more than 1 meter.

Preferably, the steel flowtube bottom enters the bearing layer.

The utility model at least comprises the following beneficial effects:

1) Fully considering the bearing capacity of the existing pipe pile, and connecting the existing pipe pile with a miniature pile formed by grouting a steel pipe through a raft structure to form a common stress structure;

2) On one hand, a raft foundation is formed, and the bearing capacity is improved; and on the other hand, the foam light soil is poured to reduce the load on the foundation, and the combined effect improves the stability of the foundation.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

FIG. 1 is a schematic view of a pile-based high-fill subgrade reinforcement structure for a soft soil foundation according to the present utility model;

fig. 2 is a schematic plan view of the arrangement of the steel floral tube of the present utility model.

Reference numerals illustrate: 1 original pipe pile, 2 steel flower pipe, 3 raft, 4 pile cap, 5 foam lightweight soil layer, 6 concrete cushion layer, 7 road surface layers.

Detailed Description

The present utility model will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the utility model based on these descriptions. Before describing the present utility model with reference to the accompanying drawings, it should be noted in particular that: the technical solutions and technical features provided in the sections including the following description in the present utility model may be combined with each other without conflict.

In addition, the embodiments of the present utility model referred to in the following description are typically only some, but not all, embodiments of the present utility model. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present utility model, based on the embodiments of the present utility model.

The utility model is further described in detail below with reference to the drawings and the implementation, and the implementation process is as follows:

as shown in fig. 1 to 2, the present utility model provides a reinforcing structure for a high-fill subgrade of an existing pipe pile of a soft soil foundation, comprising: the pile comprises a raw pipe pile 1 with a pile cap 4, a steel pipe 2, a grouting reinforcement layer, a raft 3, a foam lightweight soil layer 5, a concrete cushion layer 6 and a pavement layer 7;

the steel pipe is 2 to install the pore-forming between former tubular pile 1, fix through slip casting reinforcement layer between steel pipe 2 and the pore-forming and form miniature stake, miniature stake top, former tubular pile 1 top are connected into a whole through raft 3, be provided with foam lightweight soil layer 5 on the raft 3, be provided with concrete cushion 6 on the foam lightweight soil layer 5, be provided with pavement layer 7 on the concrete cushion 6.

The technical scheme can also comprise the following technical details so as to better realize the technical effects: the original pipe pile 1 comprises an effective pipe pile and a failure pipe pile;

the steel flowtube 2 is installed in the clearance pore-forming between the effective pipe piles, the steel flowtube 2 is installed in the clearance encryption between the invalid pipe piles, 1 steel flowtube 2 is installed in the clearance pore-forming between the effective pipe piles in the embodiment, and 2 steel flowtubes 2 are installed in the clearance around the invalid pipe piles, but the situation is not limited to the embodiment.

The technical scheme can also comprise the following technical details so as to better realize the technical effects: the pile cap 4 and the micro pile are internally provided with the ribs, and are connected with the raft 3 into a whole through the ribs; the raft 3 is a reinforced concrete structure.

The technical scheme can also comprise the following technical details so as to better realize the technical effects: the foam lightweight soil layers 5 are formed by a plurality of first foam lightweight soil layers 5 from bottom to top, and the thickness of each first foam lightweight soil layer 5 is not more than 1 meter.

The technical scheme can also comprise the following technical details so as to better realize the technical effects: the bottom of the steel pipe 2 enters a bearing layer, the longitudinal error deviation of drilling holes is less than or equal to 50mm, and the inclination deviation of the holes cannot be less than 2 degrees.

Example 2

A reinforcement method of a roadbed reinforcement structure of a soft soil foundation with high filling of existing tubular piles comprises the following steps:

1) Monitoring holes are distributed on two sides of the toe and are arranged at intervals of 10m, and deep displacement is monitored.

2) The original road structure is excavated to the top of the pile cap 4 in a layered slope-releasing manner, and the original pipe pile 1 is subjected to high strain test to allow bearing capacity; the steel floral tube 2 is only required to be installed in the gap to meet the design requirement, and the steel floral tube 2 is not required to be encrypted.

3) And (3) forming holes at intervals of the tubular piles by using an anchor drilling machine, wherein the diameter of the holes is 180mm, detecting the quality of the formed holes after the holes are formed, wherein the longitudinal error deviation of the holes is not more than 50mm, and the inclination deviation of the holes is not more than 2 degrees.

4) Size of steel pipe 2The hole distance is set to be 30cm, a tube head of 0.3-0.5 m is reserved at the end, the next tube joint is hoisted for sleeve welding,and the last section of steel pipe is provided with a 2m slurry stopping section.

5) Sequentially grouting from two sides to the middle and jumping holes to form a grouting reinforcement layer, specifically: the steel pipe 2 and the hole wall adopt a water reducing agent mixed with 2 percent and the water cement ratio of 0.5:1, grouting the P.042.5-grade cement slurry for one time, wherein the grouting pressure is less than or equal to 0.4MPa, and stopping grouting of the orifice; after waiting for 10-12h, performing secondary splitting grouting, wherein the grouting material adopts water cement ratio of 0.7:1, the pressure is less than or equal to 1MPa, the secondary grouting amount is less than or equal to 150kg/m, the grouting amount of a silt stratum is less than or equal to 50kg/m, the grouting amount is controlled mainly, and the grouting pressure is controlled secondarily. The grouting operation is carried out every two hours to measure horizontal displacement, and the deep horizontal displacement is less than or equal to 5mm.

6) After the slurry is solidified, the pile cap 4 of the original pipe pile 1 and the miniature pile are drilled with electric hammers to plant ribs, the aperture is 22mm, a raft 3 with the thickness of 30cm of C40 reinforced concrete is applied, and the miniature pile and the effective pipe pile are connected into a whole.

7) On the basis of the raft 3, pouring foam light soil in blocks, wherein the single-layer pouring thickness of each pouring area is not more than 1.0m, and the wet density of the foam light soil is 650kg/m ³ The 28d compressive strength is more than or equal to 1.0MPa. And finally, applying a concrete cushion layer 6 and a pavement layer 7 to finish the soft soil foundation reinforcement.

Although embodiments of the present utility model have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the utility model is suited, and further modifications may be readily made by one skilled in the art, and the utility model is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.

Claims

1. The utility model provides an existing tubular pile high fill roadbed reinforced structure of weak soil foundation, its characterized in that includes: the pile comprises a raw pipe pile with a pile cap, a steel flower pipe, a grouting reinforcement layer, a raft, a foam lightweight soil layer, a concrete cushion layer and a pavement layer;

2. The high fill subgrade reinforcing structure of existing tubular piles for soft soil foundations of claim 1, wherein said original tubular piles comprise effective tubular piles and ineffective tubular piles;

3. The reinforcing structure for the existing pile high-fill roadbed of the soft soil foundation according to claim 1, wherein the pile caps and the mini-pile embedded ribs are connected with the raft plate into a whole through the embedded ribs; the raft is of a reinforced concrete structure.

4. The existing pile high-fill roadbed reinforcement structure of a soft soil foundation according to claim 1, wherein the foam lightweight soil layers are composed of a plurality of first foam lightweight soil layers from bottom to top, and the thickness of each first foam lightweight soil layer is not more than 1 meter.

5. The structure of claim 1, wherein the bottom of the steel pipe is in the bearing layer.