CN113718569A

CN113718569A - Construction method for constructing road on soft soil foundation

Info

Publication number: CN113718569A
Application number: CN202110935080.XA
Authority: CN
Inventors: 黄政权; 赵日东; 林亨; 蒋若琳; 丁王飞
Original assignee: Guangdong Wanye Construction Group Co ltd
Current assignee: Guangdong Wanye Construction Group Co ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2021-11-30
Anticipated expiration: 2041-08-16
Also published as: CN113718569B

Abstract

The invention relates to the field of road construction, and particularly discloses a construction method for constructing a road on a soft soil foundation, which comprises the following steps: step 1), digging a groove, and installing water stop plates on the two side walls of the groove; step 2), drilling a pile hole at the bottom of the groove to a rock layer; step 3), placing a reinforcement cage in the pile hole, injecting pile body concrete mixture, and maintaining to form a support pile; step 4), paving a reinforcing mesh at the bottom of the groove, injecting anti-crack concrete mixture, and curing to form a roadbed layer; step 5), paving asphalt concrete on the road base layer to form a buffer layer; step 6), paving broken stones on the buffer layer to form a gravel layer; step 7), paving sand on the gravel layer to form a sand layer; and 8) injecting pavement concrete mixing materials on the sand layer, and curing to form the pavement. The invention has the advantage of reducing the difficulty of constructing roads on soft soil foundations.

Description

Construction method for constructing road on soft soil foundation

Technical Field

The invention relates to the field of road construction, in particular to a construction method for constructing a road on a soft soil foundation.

Background

With the development of science and technology, the demand of transportation is increasing, roads are important carriers for carrying transportation, the construction of roads is closely related to the development of transportation, and in order to meet the demand of transportation, the road construction is also needed on soft soil foundation.

The weak soil is because its water content is great, and the bearing capacity is lower, and shear strength is lower, when as the ground, can't stably support the roadbed layer structure, if the fender pile is not enough, the part of roadbed layer between two fender piles fracture appears easily, consequently, need set up more fender piles in the weak soil in order to make the roadbed layer to guarantee the stability of roadbed layer, just can keep the stability of road, so when laying the road on the soft soil ground usually, often need arrange comparatively intensive support pile.

And the soft soil mobility is strong, if adopt the immersed tube stake, can produce very obvious crowded soil effect, consequently more adopt the technology of bored concrete pile, but because required fender pile is more, the hole of collapsing appears more easily when boring in the soft soil and digging the stake hole in addition, the degree of difficulty is great for the degree of difficulty of constructing the road on the soft soil foundation is higher, consequently, still improves the space.

Disclosure of Invention

In order to reduce the difficulty of constructing a road on a soft soil foundation, the application provides a construction method for constructing the road on the soft soil foundation.

The construction method for constructing the road on the soft soil foundation adopts the following technical scheme:

a construction method for constructing a road on a soft soil foundation comprises the following steps:

step 1), digging a groove, and installing water stop plates on the two side walls of the groove;

step 2), drilling a pile hole at the bottom of the groove to a rock layer;

step 3), placing a reinforcement cage in the pile hole, injecting pile body concrete mixture, and maintaining to form a support pile;

step 4), paving a reinforcing mesh at the bottom of the groove, injecting anti-crack concrete mixture, and curing to form a roadbed layer;

step 5), paving asphalt concrete on the road base layer to form a buffer layer;

step 6), paving broken stones on the buffer layer to form a gravel layer;

step 7), paving sand on the gravel layer to form a sand layer;

and 8) injecting pavement concrete mixing materials on the sand layer, and curing to form the pavement.

Through adopting above-mentioned technical scheme, make the roadbed layer through adopting anti concrete mixture that splits for the roadbed layer is difficult for the fracture, stable in structure makes fender pile quantity can reduce by a wide margin, through the cooperation of fender pile and roadbed layer, forms the "bridge" of atress, thereby the stable supporting road structure, when making the driving, the road is not fragile, owing to can reduce the quantity of fender pile, make bored concrete pile construction quantity reduce by a wide margin, can effectively reduce the degree of difficulty of constructing the road on the soft soil foundation.

The buffer layer is made of asphalt concrete, so that the stress of the pavement is absorbed by the buffer layer, the impact on the roadbed layer is reduced, the roadbed layer is not easy to damage, and the road structure is kept stable and safe for a long time.

Through the cooperation of rubble layer and sand bed and buffer layer, further the buffering absorbs impact energy, protects the road bed layer well, ensures road stable in structure and safety.

The road surface is made of the concrete mixture of the mixed road surface, so that the road surface is smooth, the traveling experience is better, and the road quality is higher.

Preferably, the roadbed layer has a thickness of 25-30 cm.

Through adopting above-mentioned technical scheme, have suitable thickness through the roadbed layer, bearing capacity is strong, and the atress is difficult damaged, stable in structure avoids thickness too big to lead to the material extravagant simultaneously, and control cost reduces the dead weight moreover and brings extra burden to supporting the stake.

Preferably, the thickness of the buffer layer is 3-5 cm.

Through adopting above-mentioned technical scheme, have suitable thickness through the buffer layer, have sufficient deformation scope, the energy-absorbing effect is better, plays better guard action to the road bed.

Preferably, the thickness of the crushed stone layer is 10-12 cm.

Through adopting above-mentioned technical scheme, have sufficient thickness through the metalling, the energy-absorbing effect is better, stable in structure, better water permeability in addition to and abundant water storage space, the drainage effect is preferred.

Preferably, the thickness of the sand layer is 2-3 cm.

Through adopting above-mentioned technical scheme, have sufficient thickness through the sand bed, fill the pothole on rubble layer surface, avoid rubble layer and road surface direct contact, fully further cushion through the sand bed, the buffering energy-absorbing effect is better, and both rubble layer and road surface are difficult damaged, and the result is more stable.

Preferably, the anti-crack concrete mixture comprises the following components in parts by weight:

100 parts of water;

345 parts of cement 338-;

33.5-34.2 parts of fly ash;

sand 395-;

770-780 parts of gravel;

0.8-1.1 parts of anti-cracking auxiliary agent.

100 parts of water;

cement 340-;

33.8-34 parts of fly ash;

398 sand and 401 portions;

776-778 parts of gravel;

0.9-1 part of anti-cracking auxiliary agent.

Through adopting above-mentioned technical scheme, through suitable water-cement ratio, make the roadbed structure compressive strength who makes higher, cooperation through anti-crack auxiliary agent, make the roadbed structure anti-cracking performance who makes stronger, cooperation reinforcing bar net, make roadbed structure also be difficult for splitting under the large-span, the stable support can be realized to a small amount of support piles of cooperation, in order to at the stable reinforced concrete "bridge" of underground administration, the stable road structure that supports, make the road structure who makes stable, the security preferred.

Preferably, the auxiliary agent is a compound of calcium chlorate and potassium bromide, and the mass ratio of the calcium chlorate to the potassium bromide is 3: 1.

by adopting the technical scheme, the calcium chlorate and the potassium bromide are compounded in a specific proportion, so that the effect of improving the crack resistance of the manufactured concrete structure is better, the roadbed layer is not easy to crack, and the stability is higher.

To this, the inventor guesses, the addition of calcium chlorate and potassium bromide, can introduce chlorate ion and bromide in the cement system, and when chlorate ion and bromide exist with certain proportion, probably play certain influence to cement colloid promptly calcium silicate hydrate, make the cohesive force of cement colloid and aggregate promote to some extent, make the solidification back, it is stable to be connected between set cement and the aggregate, difficult separation, thereby make the way basic unit structure when the atress, be difficult for forming weak point in set cement and aggregate interface department, thereby make the difficult fracture also difficult fracture of way basic unit structure, the reinforcing effect of cooperation reinforcing bar, can make the way basic unit structure stable, the security preferred.

In summary, the present application has the following beneficial effects:

1. because this application makes the roadbed layer through adopting anti concrete mixture that splits for the roadbed layer is difficult for the fracture, stable in structure makes fender pile quantity reduce by a wide margin, through the cooperation of fender pile and roadbed layer, forms the "bridge" of atress, thereby the stable supporting road structure, when making the driving, the road is not fragile, owing to can reduce the quantity of fender pile, makes bored concrete pile construction quantity reduce by a wide margin, can effectively reduce the degree of difficulty of constructing the road on the soft soil foundation.

2. The preferred water-cement ratio that passes through in this application for the roadbed structure compressive strength who makes is higher, cooperation through anti-crack auxiliary agent, make the roadbed structure anti-cracking performance who makes stronger, cooperation reinforcing bar net, make roadbed structure also difficult fracture under the large-span, the stable support can be realized to the support stake of cooperation a small amount, with at the stable reinforced concrete "bridge" of underground administration, the stable road structure that supports, make the road structure who makes stable, the security preferred.

3. Preferably in this application through calcium chlorate and potassium bromide with specific proportion complex for the effect of the crack resistance ability of the concrete structure of improvement making is better, makes the difficult fracture of roadbed layer, and stability is higher.

Detailed Description

The present application will be described in further detail with reference to examples.

The information on the source of the raw materials used in the following preparations and examples is shown in Table 1.

TABLE 1

Raw materials	Source information
		Cement	Jun brand ordinary portland cement PO42.5R of Yanxin Yonggang group Co., Ltd
Fly ash	First grade fly ash of Hangzhou Cheng Ca products Co., Ltd
		Sand	Lingshou county constant-spread mineral processing plant, river sand
Crushing stone	Yaotai mineral products Ltd, Lingshu county, average particle diameter 8mm
		Calcium chlorate	Jinjinle (Hunan) chemical Co., Ltd., purity 99%
Potassium bromide	Weifang Fan Mao chemical Limited company, content 98%

Preparation examples 1 to 5

An anti-crack concrete mixture comprises the following components:

water, cement, fly ash, sand, broken stone and anti-cracking auxiliary agent.

The anti-cracking auxiliary agent is a compound of calcium chlorate and potassium bromide, and the mass ratio of the calcium chlorate to the potassium bromide is 3: 1.

the specific amounts (in Kg) of the ingredients used in preparation examples 1-5 are given in Table 2.

TABLE 2

	Preparation example 1	Preparation example 2	Preparation example 3	Preparation example 4	Preparation example 5
						Water (W)	100	100	100	100	100
Cement	338	340	342	345	341
						Fly ash	33.5	33.8	34	34.2	33.9
Sand	395	398	401	405	400
						Crushing stone	770	776	778	780	779
Anti-cracking aid	0.8	0.9	1	1.1	0.95

In preparation examples 1 to 5, the preparation method of the anti-crack concrete mix was as follows:

putting water, cement, fly ash and an anti-cracking auxiliary agent into a stirring kettle, stirring for 5min at the rotating speed of 120r/min, then putting sand and broken stone, stirring for 15min at the rotating speed of 60r/min, and obtaining the anti-cracking concrete mixture.

Preparation example 6

Compared with the preparation example 5, the anti-crack concrete mixture only differs from the preparation example 5 in that:

the anti-cracking auxiliary agent is a compound of calcium chlorate and potassium bromide, and the mass ratio of the calcium chlorate to the potassium bromide is 2: 1.

preparation example 7

the anti-cracking auxiliary agent is a compound of calcium chlorate and potassium bromide, and the mass ratio of the calcium chlorate to the potassium bromide is 4: 1.

preparation example 8

the anti-cracking auxiliary agent is replaced by the same amount of sand.

Example 1

step 1), excavating a groove according to a design drawing, installing water stop plates on two side walls of the groove, inserting the water stop plates into soil, wherein the insertion depth is 30cm so as to keep the water stop plates stable, and the top of each water stop plate is flush with the top of the groove.

And 2) performing over-period drilling at the bottom of the groove to obtain the depth of the rock layer, namely the pile length of the cast-in-place pile, drilling and digging pile holes, wherein the pile holes extend to the rock layer, the pore diameter of each pile hole is 1m, the pile holes are uniformly distributed along the length direction of the groove, the minimum distance between every two adjacent pile holes is 100m, and the axis of each pile hole is intersected with the central line of the bottom of the groove in the extension direction.

And 3) placing a reinforcement cage in the pile hole, wherein the top of the reinforcement cage extends out of the pile hole and is 20cm higher than the bottom of the groove, injecting pile body concrete mixture into the pile hole, maintaining for 7d, and supporting the pile in the shape.

And 4), paving a reinforcing mesh at the bottom of the groove, binding the reinforcing mesh and the part of the reinforcing cage of the support pile, which extends out of the pile hole, so as to be fixedly connected, injecting anti-crack concrete mixture into the groove, and maintaining for 7d to form a road base layer with the thickness of 25 cm.

And 5), paving asphalt concrete on the road base layer, compacting, and cooling until the surface temperature is lower than 40 ℃ to form a buffer layer with the thickness of 3 cm.

And 6) paving broken stones on the buffer layer to form a broken stone layer with the thickness of 10 cm.

And 7) paving sand on the gravel layer to form a sand layer with the thickness of 2 cm.

And 8), injecting pavement concrete mixture on the sand layer, maintaining for 7d to form a pavement, and constructing drainage ditches and road edge stones to finish road construction.

In this embodiment, the crushed stone in the crushed stone layer and the crushed stone in the anti-crack concrete mixture have the same material and the same average particle size.

In this example, the sand in the sand layer and the sand in the anti-crack concrete mixture were consistent in quality and average particle size.

In this example, a commercially available C60 ordinary concrete mixture was used as the pile concrete mixture.

In this example, a commercially available C45 ordinary concrete mixture was used as the road concrete mixture.

In this example, commercially available AC16 asphalt concrete was used as the asphalt concrete.

In this example, the anti-crack concrete mixture of preparation example 1 was used.

Example 2

Compared with the embodiment 1, the construction method for constructing the road on the soft soil foundation only has the following differences: the roadbed layer thickness is 30 cm.

The thickness of the buffer layer is 5 cm.

The thickness of the crushed stone layer is 12 cm.

The thickness of the sand layer is 3 cm.

Example 3

Compared with the embodiment 1, the construction method for constructing the road on the soft soil foundation only has the following differences: in this example, the anti-crack concrete mixture of preparation example 2 was used.

Example 4

Compared with the embodiment 1, the construction method for constructing the road on the soft soil foundation only has the following differences: in this example, the anti-crack concrete mixture of preparation example 3 was used.

Example 5

Compared with the embodiment 1, the construction method for constructing the road on the soft soil foundation only has the following differences: in this example, the anti-crack concrete mixture of preparation example 4 was used.

Example 6

Compared with the embodiment 1, the construction method for constructing the road on the soft soil foundation only has the following differences:

in this example, the anti-crack concrete mixture of preparation example 5 was used.

Experiment 1

According to the standard GB/T50081-2016 of common concrete mechanical property test method, the 7d compressive strength, 28d compressive strength and 28d splitting tensile strength of concrete samples prepared from the anti-cracking concrete mixture of the preparation examples 1-8 are detected.

The assay data for experiment 1 is detailed in table 3.

TABLE 3

According to comparison of data of preparation example 5 and preparation examples 6-8 in table 3, when calcium chlorate and potassium bromide are added into a concrete mixture according to a specific proportion, the crack resistance of the prepared concrete sample is effectively improved, and when the calcium chlorate and the potassium bromide are added simultaneously but the proportion is changed, the crack resistance of the prepared concrete sample can also be improved to a certain extent, but the improvement range is not ideal.

In addition, the compressive strength of the prepared concrete sample is improved due to the addition of calcium chlorate and potassium bromide, so that the prepared road base layer is stable in structure, not easy to damage and high in bearing capacity, the quantity of the support piles is reduced, and the construction difficulty of constructing roads on soft soil foundations is reduced.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. A construction method for constructing a road on a soft soil foundation is characterized in that: the method comprises the following steps:

step 2), drilling a pile hole at the bottom of the groove to a rock layer;

step 5), paving asphalt concrete on the road base layer to form a buffer layer;

step 6), paving broken stones on the buffer layer to form a gravel layer;

step 7), paving sand on the gravel layer to form a sand layer;

2. A construction method for constructing a road on a soft ground according to claim 1, characterized in that: the thickness of the roadbed layer is 25-30 cm.

3. A construction method for constructing a road on a soft ground according to claim 2, characterized in that: the thickness of the buffer layer is 3-5 cm.

4. A construction method for constructing a road on a soft ground according to claim 3, characterized in that: the thickness of the crushed stone layer is 10-12 cm.

5. A construction method for constructing a road on a soft ground according to claim 4, characterized in that: the thickness of the sand layer is 2-3 cm.

6. A construction method for constructing a road on a soft ground according to any one of claims 1 to 5, characterized in that: the anti-crack concrete mixture comprises the following components in parts by weight:

100 parts of water;

345 parts of cement 338-;

33.5-34.2 parts of fly ash;

sand 395-;

770-780 parts of gravel;

0.8-1.1 parts of anti-cracking auxiliary agent.

7. A construction method for constructing a road on a soft ground according to claim 6, characterized in that: the anti-crack concrete mixture comprises the following components in parts by weight:

100 parts of water;

cement 340-;

33.8-34 parts of fly ash;

398 sand and 401 portions;

776-778 parts of gravel;

0.9-1 part of anti-cracking auxiliary agent.

8. A construction method for constructing a road on a soft ground according to claim 7, characterized in that: the auxiliary agent is a compound of calcium chlorate and potassium bromide, and the mass ratio of the calcium chlorate to the potassium bromide is 3: 1.