CN216615676U

CN216615676U - Bottom sealing structure suitable for soft plastic silt riverbed

Info

Publication number: CN216615676U
Application number: CN202123082180.7U
Authority: CN
Inventors: 刘德新; 庄值政; 危志豪; 王文清; 房波; 饶杰; 李思公; 宁征波
Original assignee: CCCC First Highway Engineering Co Ltd
Current assignee: CCCC First Highway Engineering Co Ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-05-27
Anticipated expiration: 2031-12-09

Abstract

The utility model provides a bottom sealing structure suitable for a soft plastic silt riverbed, which comprises an isolation layer laid on a cleaned substrate and a fixing layer laid on the isolation layer, wherein the fixing layer is used for keeping the isolation layer in a flat state, and a concrete layer is poured on the fixing layer. Can form relatively level and smooth concrete placement basic unit on the riverbed basement, take place to press from both sides sand and add the mud phenomenon when preventing concrete placement, guarantee the effective thickness of back cover concrete.

Description

Bottom sealing structure suitable for soft plastic silt riverbed

Technical Field

The utility model relates to the field of cofferdam construction, in particular to a bottom sealing structure suitable for a soft plastic sludge riverbed.

Background

In the related technology, in order to meet the bottom sealing concrete quality, the soft plastic sludge riverbed generally needs ultra-deep filling replacement, firstly, ultra-deep dredging is carried out in an underwater mud suction mode, and then, broken stones or coarse sand are backfilled to meet the requirement of riverbed rigidity. Meanwhile, the cofferdam bottom sealing construction mostly adopts a full pipe layout method, a centralized material distribution and diversion method and a bile duct pushing method, concrete is directly poured on the cleaned riverbed, the process is complicated, the cost is high, and the bottom sealing of the construction method has the quality problems of sand inclusion and mud inclusion of the concrete, so that the effective thickness of the bottom sealing concrete is reduced, and the potential safety hazard of the structure is caused.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems presented in the related art.

Therefore, the utility model aims to provide a bottom sealing structure suitable for a soft-molding muddy riverbed, which can form a relatively flat concrete pouring base layer on a riverbed base, prevent the phenomena of sand inclusion and mud adding during concrete pouring and ensure the effective thickness of bottom sealing concrete.

In order to achieve the purpose, the utility model provides a bottom sealing structure suitable for a soft plastic muddy riverbed, which comprises an isolation layer laid on a cleaned substrate and a fixing layer laid on the isolation layer, wherein the fixing layer is used for keeping the isolation layer in a flat state, and a concrete layer is poured on the fixing layer.

According to the bottom sealing structure suitable for the soft plastic muddy riverbed, the isolation layer is laid on the cleaned riverbed base, the fixing layer is laid on the isolation layer, the fixing layer can keep the flattening state of the isolation layer, a relatively flat concrete pouring base layer can be formed on the riverbed base, the sand inclusion and mud adding phenomenon during concrete pouring is prevented, and the effective thickness of bottom sealing concrete is ensured.

In addition, the bottom sealing structure suitable for the soft plastic muddy riverbed provided by the utility model can also have the following additional technical characteristics:

optionally, the barrier layer is geotextile.

Optionally, the fixing is into a geogrid.

Optionally, the geotextile and the geogrid are prefabricated into a bundle, and the laying is completed by rolling and unfolding.

Optionally, both sides of the geogrid in the length direction are covered by the geotextile.

Optionally, fixing ropes for connecting with the geogrid are arranged on two sides of the geotextile along the length direction.

Optionally, the fixing ropes are arranged on two sides of the geotextile along the length direction in a penetrating manner.

Optionally, the fixing rope is parallel to the extending direction of the geotextile.

Optionally, the fixing ropes are symmetrically arranged on two sides of the geogrid in the length direction.

Drawings

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

FIG. 1 is a schematic diagram of a bottom sealing structure suitable for soft plastic muddy riverbeds according to an embodiment of the utility model;

fig. 2 is a schematic view of the geotextile and geogrid of fig. 1;

fig. 3 is a schematic view showing the connection of the geotextile and the geogrid of fig. 1;

FIG. 4 is a schematic view of the attachment of the geotextile to the securing rope of FIG. 3;

fig. 5 is a side view of fig. 4.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

The bottom sealing structure suitable for the soft plastic muddy riverbed according to the embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 5, the bottom sealing structure for a soft plastic muddy riverbed according to the embodiment of the present invention includes an isolation layer laid on a cleaned substrate 40, and a fixing layer laid on the isolation layer, the fixing layer being for maintaining the isolation layer in a flattened state, and a concrete layer 20 being poured on the fixing layer.

Specifically, the isolation layer is geotextile 12, the fixed layer is geogrid 11, and geotextile 12 and geogrid 11 are connected together to form leveling layer 10.

In this embodiment, the fixing ropes 13 are inserted into two side edges of the geotextile 12 in the length direction, then the two side edges of the geogrid 13 in the length direction are covered by the two side edges of the geotextile 12 in the length direction, and the fixing ropes 13 are bolted to two end portions of the geogrid 13, so that the purpose of connecting the geotextile 12 and the geogrid 13 to form the leveling layer 10 is achieved.

It should be noted that, since the fixing ropes 13 penetrate through the two side edges of the geotextile 12 in the length direction, the two side edges of the geotextile 12 in the length direction can be rolled on the two sides of the geogrid 11 by tensioning the fixing ropes 13, and the influence on the effective thickness of the concrete layer 20 due to the rolling of the two side edges of the geotextile 12 can be effectively avoided.

It will be appreciated that construction efficiency can be improved by rolling the screed 10 into a bundle and then applying the mat in a rolling manner.

As an example, when the geotextile 12 is attached to the geogrid 11, the fixing strings 13 at both sides of the geotextile 12 are maintained to be symmetrically arranged at both sides of the geogrid 11.

In order to ensure the flatness of the geotextile 12 after being spread, the fixing ropes 13 at both sides of the geotextile 12 can be kept parallel to the extending direction of the geotextile 12.

It will be appreciated that in order to improve the stability of the installation of the screed 10 formed by the geotextile 12 and the geogrid 11 and to reduce the impact of the concrete on the geotextile 12, a plurality of prefabricated panels 160 may be laid on the screed 10, and the prefabricated panels 160 may serve as concrete pouring points to protect the screed 10.

According to the bottom sealing structure for the soft plastic sludge riverbed provided by the utility model, the leveling layer 10 is laid on the riverbed substrate 40 cleaned in the cofferdam 110, the precast slab 160 is laid on the leveling layer 10, the relatively flat concrete layer 20 can be formed on the riverbed substrate 40, and finally the bearing platform 30 is constructed on the concrete layer 20, so that the sand inclusion and mud adding phenomenon during concrete pouring can be prevented, and the effective thickness of bottom sealing concrete can be ensured.

The construction method of the bottom sealing structure suitable for the soft plastic sludge riverbed comprises the following steps:

step one, original riverbed elevation arrangement and steel pipe pile underwater treatment are carried out.

When the base is desilted in the first step, firstly, a high-power sludge suction pump is adopted for the riverbed in the cofferdam 110 to carry out desilting and reduce the riverbed elevation, and the riverbed elevation is controlled to be less than 1.0m below zero after desilting (the peripheral corners of the cofferdam 110 are controlled to be less than 1.5m below zero).

The river bed elevation needs to be repeatedly measured in the mud suction process, the over-suction is reduced as much as possible, and the bottom elevation is strictly controlled.

The standard of substrate dredging is that the substrate is approximately flat, the gradient is slow and excessive, and local deep pits or steep ridges are strictly forbidden.

After the substrate is desilted, a diver is required to perform a drainage check.

It will be appreciated that the bed remains in the sludge layer after the substrate is desilted.

And step two, paving a leveling layer 10 consisting of geotextile and geogrid on the substrate.

In the second step, when the leveling layer 10 is laid, the process is as follows:

the surface operator drags the bundle of screed 10 by means of the tow ropes 50, and the underwater operator is responsible for the levelling and fixing, the laying being completed by the rolling of the screed 10.

And step three, paving the precast slabs 160 on the leveling layer 10.

And fourthly, building a construction platform.

When a construction platform is erected on the steel casing 130, a Bailey truss is adopted to be erected vertically and horizontally, and plywood is laid on the Bailey truss.

And fifthly, adopting a double-conduit moving head sealing propulsion method to pour concrete.

Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The utility model provides a back cover structure suitable for soft muddy riverbed that moulds, its characterized in that, including laying the isolation layer on the basement after the clearance, and lay fixed bed on the isolation layer, the fixed bed is used for keeping the flat state of exhibition of isolation layer, concrete layer pours on the fixed bed.

2. The bottom sealing structure for soft plastic muddy riverbed as claimed in claim 1,

the isolation layer is made of geotextile.

3. The bottom sealing structure for soft plastic muddy riverbed as claimed in claim 2,

the fixed layer is a geogrid.

4. A bottom sealing structure for soft plastic muddy riverbed as claimed in claim 3,

the geotextile and the geogrid are prefabricated into bundles, and the geotextile and the geogrid are laid after being rolled and unfolded.

5. The bottom sealing structure for soft plastic muddy riverbed as claimed in claim 4,

and two side edges of the geogrid along the length direction are coated by the geotextile.

6. The bottom sealing structure for soft plastic muddy riverbed as claimed in claim 5,

and fixing ropes for connecting the geogrid are arranged on two side edges of the geotextile along the length direction.

7. The bottom sealing structure for soft plastic muddy riverbed as claimed in claim 6,

the fixed ropes are arranged on two side edges of the geotextile along the length direction in a penetrating mode.

8. The bottom sealing structure for soft plastic silt riverbed as claimed in claim 7,

the fixed rope is parallel to the extending direction of the geotextile.

9. The bottom sealing structure for soft plastic muddy riverbed as claimed in claim 8,

the fixing ropes are symmetrically arranged on two sides of the geogrid along the length direction.