阅读说明：本技术 浅基础建筑周边静压桩打桩防护方法 (Piling protection method for static pressure piles around shallow foundation building ) 是由 孙康 邓晖 赵月勇 于 2020-11-25 设计创作，主要内容包括：本申请涉及工程施工领域,具体公开了一种浅基础建筑周边静压桩打桩防护方法。包括以下步骤：步骤1),在静压桩区域与浅基础建筑之间开挖沟槽,所述沟槽深度为8-12米；步骤2),沟槽两侧壁上铺设防护网,所述防护网由导热材料制成并完全覆盖沟槽侧壁；步骤3),沟槽内回填石块至与沟槽顶部平齐；步骤4),加热防护网至沥青组合物熔融温度以上,向沟槽内注入热熔的沥青组合物以填充石块间隙；步骤5),待沥青组合物填满沟槽后,压实沟槽顶部；步骤6),停止防护网加热,静置冷却72小时或以上,即可进行静压桩打桩作业。其具有可恢复静压桩施工时防护结构所在区域的土壤结构,减少对该区域的后期用途的限制的优点。(The application relates to the field of engineering construction, and particularly discloses a shallow foundation building peripheral static pressure pile piling protection method. The method comprises the following steps: step 1), digging a groove between a static pressure pile area and a shallow foundation building, wherein the depth of the groove is 8-12 m; step 2), paving protective nets on the two side walls of the groove, wherein the protective nets are made of heat conduction materials and completely cover the side walls of the groove; step 3), backfilling stones in the groove until the stones are flush with the top of the groove; step 4), heating the protective net to a temperature higher than the melting temperature of the asphalt composition, and injecting the hot-melt asphalt composition into the grooves to fill gaps between the stones; step 5), after the groove is filled with the asphalt composition, compacting the top of the groove; and 6), stopping heating the protective net, standing and cooling for 72 hours or more, and then performing static pressure pile driving operation. The method has the advantages that the soil structure of the area where the protective structure is located during construction of the static pressure pile can be restored, and limitation on later-period use of the area is reduced.)

1. The pile driving protection method for the peripheral static pressure pile of the shallow foundation building is characterized by comprising the following steps of: the method comprises the following steps:

step 1), digging a groove between a static pressure pile area and a shallow foundation building, wherein the depth of the groove is 8-12 m;

step 2), paving protective nets on the two side walls of the groove, wherein the protective nets are made of heat conduction materials and completely cover the side walls of the groove;

step 3), backfilling stones in the groove until the stones are flush with the top of the groove;

step 4), heating the protective net to a temperature higher than the melting temperature of the asphalt composition, and injecting the hot-melt asphalt composition into the grooves to fill gaps between the stones;

step 5), after the groove is filled with the asphalt composition, compacting the top of the groove;

and 6), stopping heating the protective net, standing and cooling for 72 hours or more, and then performing static pressure pile driving operation.

2. The shallow foundation building perimeter static pressure pile piling protection method according to claim 1, wherein: the protective net is made of a metal material.

3. The shallow foundation building perimeter static pressure pile piling protection method according to claim 2, wherein: the protective net is made of stainless steel materials.

4. The shallow foundation building perimeter static pressure pile piling protection method according to claim 1, wherein: in the step 4), the protective net is heated to 150-180 ℃.

5. The shallow foundation building perimeter static pressure pile piling protection method according to claim 4, wherein: in the step 4), the protection net is heated to 160-170 ℃.

6. The shallow foundation building perimeter static pressure pile piling protection method according to claim 1, wherein: in the step 4), the temperature for injecting the hot-melt asphalt composition into the groove is 160-170 ℃.

7. The shallow foundation building perimeter static pressure pile piling protection method according to claim 1, wherein: the asphalt composition comprises the following components in parts by mass:

100 parts of petroleum asphalt;

10-15 parts of heat-conducting powder;

20-30 parts of a solvent.

8. The shallow foundation building perimeter static pressure pile piling protection method according to claim 7, wherein: the heat conducting powder is prepared by melting, mixing and grinding ammonium chloride, barium chromate and cuprous bromide in a mass ratio of 1:0.5-1:2.5-3 into powder.

9. The shallow foundation building perimeter static pressure pile piling protection method according to claim 7, wherein: the solvent adopts kerosene.

Technical Field

The application relates to the field of engineering construction, in particular to a piling protection method for a peripheral static pressure pile of a shallow foundation building.

Background

The static pressure pile is a method for engineering pile foundation construction, and is a pile sinking process, and is characterized by that it adopts pile-pressing machine to press the prefabricated static pressure pile into the ground by means of gravity, so that it can prevent vibration and noise produced by hammering pile and can make construction convenient.

Because the static pressure stake is direct with in the stake body is pressed into soil, and does not take out soil, the pile body has occupied the space of soil, will make soil extruded for the effort of soil parcel pile body is stronger, and the pile body is stable, also can appear soil body migration simultaneously, and the soil moves towards the direction of keeping away from the pile body promptly, especially the better silt of mobility.

If static pressure pile construction is carried out on the periphery of the existing building, soil migration may extrude the building foundation on the periphery of a construction area, so that the pile foundation of the existing building is unstable or even damaged, particularly shallow foundation buildings are damaged greatly, and therefore protection is usually carried out during static pressure pile construction, and flowing soil is prevented from migrating towards the existing building.

Underground diaphragm walls or continuous cast-in-place piles are often constructed between the construction area and the existing building to block the flowing soil.

In view of the above-mentioned related art, the inventor found that there is a problem that it is difficult to disassemble the underground diaphragm wall or the continuous cast-in-place pile after construction, which results in that the soil structure at the protective structure of the static pressure pile cannot be recovered, and the later use of the area is greatly limited.

Disclosure of Invention

In order to reduce the limitation of the protective structure of the static pressure pile on the later-stage application of the area where the protective structure is located, the application provides a shallow foundation building perimeter static pressure pile piling protection method.

The application provides a shallow foundation building perimeter static pressure pile driving protection method adopts following technical scheme:

a pile driving protection method for perimeter static pressure piles of shallow foundation buildings comprises the following steps:

step 1), digging a groove between a static pressure pile area and a shallow foundation building, wherein the depth of the groove is 8-12 m;

step 2), paving protective nets on the two side walls of the groove, wherein the protective nets are made of heat conduction materials and completely cover the side walls of the groove;

step 3), backfilling stones in the groove until the stones are flush with the top of the groove;

step 4), heating the protective net to a temperature higher than the melting temperature of the asphalt composition, and injecting the hot-melt asphalt composition into the grooves to fill gaps between the stones;

step 5), after the groove is filled with the asphalt composition, compacting the top of the groove;

and 6), stopping heating the protective net, standing and cooling for 72 hours or more, and then performing static pressure pile driving operation.

By adopting the technical scheme, the grooves are filled with the stones, then the gaps of the stones are filled with the hot-melt asphalt composition, after the asphalt composition is cooled and solidified, the stones are stably bonded to form a stable stone wall, and soil migration is blocked through the stone wall structure, so that protection is realized.

Through laying the protection network at slot both sides wall, the cooperation pitch composition is in order to restrict "stone wall" better and warp, make the effect of blockking soil migration more, and because the protection network is made by the heat conduction material, can continuously heat the pitch composition through heating the protection network, avoid the in-process that the hot melt pitch composition flows to lead to the condition that mobility descends or even solidification by a wide margin owing to the cooling, guarantee that the pitch composition can keep the better state of mobility betterly, make in the clearance between the sufficient infiltration stone of pitch composition, thereby guarantee the effect of pitch composition bonding stone, make the "stone wall" stable in structure who forms, it is better to keep off the soil effect.

Through adopting bituminous mixture to cohere the stone in order to form "stone wall", make the static pressure stake construction accomplish the back, accessible heating protection network is in order to excavate the stone with heat transfer to bituminous mixture, and then realize the heating to bituminous mixture, make the pitch composition disappear to the connective force of stone, cancel "stone wall" stable state, can dig out the stone through excavating equipment, thereby protective structure when making the static pressure stake construction can dismantle, backfill soil and compaction after digging out the stone, protective structure is regional soil structure when can resuming static pressure stake construction, because the recovery of soil structure, make this region can be under construction once more according to actual usage, make the later stage usage in this region wider, reduce the restriction to the later stage usage in this region.

Preferably, the protection net is made of a metal material.

Through adopting above-mentioned technical scheme, the protection network structural strength of making through metal material is higher, restricts "stone wall" better and warp, and it is better to keep off the soil effect, and metal material's heat conductivility is better for heat transfer efficiency is higher during the heating protection network, makes the pitch composition change by heating the melting, changes and dismantles "stone wall", reduces the restriction to the later stage usage in protection structure place region.

Preferably, the protection net is made of a stainless steel material.

Through adopting above-mentioned technical scheme, make the protection network through adopting stainless steel material for the structural strength of protection network is stronger, is difficult for being corroded by the steam in the soil moreover, can keep stable in structure lastingly, has better heat conductivility moreover, makes the effect preferred of heating pitch composition, thereby makes "stone wall" easily dismantle, is convenient for reply soil structure, reduces the restriction to the later stage usage in protective structure place region.

Preferably, in the step 4), the protective net is heated to 150-.

Preferably, in the step 4), the protection net is heated to 160-170 ℃.

By adopting the technical scheme, the protective net is heated to 150-180 ℃, so that the effect of heating the asphalt composition is better, and the adverse reaction caused by overhigh temperature is avoided.

Preferably, in the step 4), the temperature for injecting the hot-melt asphalt composition into the groove is 160-170 ℃.

By adopting the technical scheme, the temperature of the asphalt composition injected into the groove is controlled to be 160-170 ℃, so that the asphalt composition has better fluidity and is not easy to generate negative reaction due to overhigh temperature.

Preferably, the asphalt composition comprises the following components in parts by mass:

100 parts of petroleum asphalt;

10-15 parts of heat-conducting powder;

20-30 parts of a solvent.

By adopting the technical scheme, the solvent is added into the petroleum asphalt, so that the petroleum asphalt is diluted to a certain degree, the fluidity is increased, the heat-conducting powder is added into the petroleum asphalt, so that the asphalt composition has better heat-conducting property, the heat transferred by the protective net is better and uniformly distributed and quickly conducted when the asphalt composition is injected into the groove, the fluidity reduction caused by cooling in the flowing process of the asphalt composition is ensured, and the construction effect is ensured;

meanwhile, heat is transferred through the heat conduction powder, so that after the static pressure pile is constructed, when the 'stone wall' needs to be disassembled, the heat is transferred through the heat conduction powder, the heat is transferred in the asphalt composition, the heat transferred from the protective net is rapidly transferred and uniformly distributed in the asphalt composition, the construction of damaging the stability of the 'stone wall' by melting the asphalt composition is more convenient, the 'stone wall' is convenient to disassemble, the soil structure is beneficial to recover, and the limitation to later-stage purposes of the area is reduced.

Preferably, the heat conducting powder is prepared by melting, mixing and grinding ammonium chloride, barium chromate and cuprous bromide in a mass ratio of 1:0.5-1:2.5-3 into powder.

Through adopting above-mentioned technical scheme, through the heat conduction powder that ammonium chloride, barium chromate, cuprous bromide formed with specific proportion melt-mixing, its thermal conductivity is higher, and the effect with heat transfer to in the pitch is better.

To this end, the inventor guesses that ammonium chloride, barium chromate, cuprous bromide may be under the molten state, the electron of each raw materials influences each other, has changed the orbit of electron, may form brand-new and the motion trail of joint movement even, lead to taking place unexpected change for the thermal conductivity of heat conduction powder promotes by a wide margin, and the heat conduction effect is better, thereby has guaranteed the heat conduction efficiency of pitch, makes the protection network heat the effect of pitch composition better, thereby makes to dismantle "stone wall" comparatively convenient.

Preferably, the solvent is kerosene.

By adopting the technical scheme, the kerosene is adopted as a solvent, is difficult to self-ignite and is relatively stable under the condition of heating to 150-180 ℃.

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

1. because this application adopts bituminous mixture to cohere the stone in order to form "stone wall", make the static pressure stake construction accomplish the back, accessible heating protection network is in order to excavate the stone with heat transfer to bituminous mixture, and then realize the heating to bituminous mixture, make the engaging force of "stone wall" disappear, cancel "stone wall" stable state, can dig out the stone through excavating equipment, thereby protective structure when making the static pressure stake construction can dismantle, backfill soil and compaction after digging out the stone, protective structure place regional soil structure when can resuming static pressure stake construction, because the recovery of soil structure, make this region can be under construction once more according to practical use, make the later stage usage in this region wider, reduce the restriction to the later stage usage in this region.

2. The protection network is made to preferred adoption stainless steel material in this application, makes the protection network through adopting stainless steel material for the structural strength of protection network is stronger, and the steam that is difficult for in by soil in addition corrodes, can keep stable in structure lastingly, has better heat conductivility moreover, makes the effect preferred of heating pitch composition, thereby makes "stone wall" easily dismantle, is convenient for reply soil structure, reduces the restriction to the later stage usage in protective structure place region.

3. In the application, the heat conducting powder formed by melting and mixing ammonium chloride, barium chromate and cuprous bromide in a specific ratio is preferably adopted, the heat conductivity is high, and the effect of transferring heat into asphalt is better.

Drawings

Fig. 1 is a schematic flow chart of the perimeter static pressure pile piling protection method for the shallow foundation building.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples.

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

TABLE 1

Raw materials	Source information
		Petroleum asphalt	90# road petroleum asphalt sold by Hengshuihao rubber chemical industry Co., Ltd
Ammonium chloride	Ammonium chloride sold by Shandong Jining ternary chemical industry Co., Ltd
		Barium chromate	Barium chromate sold by Tanghe Honghong chemical Co Ltd
Cuprous bromide	Suzhou bin cuprous bromide sold by Shun chemical industry Co., Ltd
		Kerosene oil	3# kerosene sold by Jinan Ying Shun chemical industry Co Ltd

Example 1

Referring to fig. 1, a perimeter static pressure pile piling protection method for a shallow foundation building comprises the following steps:

step 1), according to a construction drawing, positioning a static pressure pile construction area, marking a protective structure construction area between the static pressure pile construction area and a shallow foundation building, wherein the vertical distance between the protective structure construction area and the static pressure pile construction area is twice as long as that between the protective structure construction area and the shallow foundation building, digging a groove in the protective structure construction area, the depth of the groove is 8 meters, the width of the groove is 1 meter, the length direction of the groove is parallel to the edge of the shallow foundation building closest to the static pressure pile construction area, the length of the groove is 120 percent of the length of the edge of the shallow foundation building closest to the static pressure pile construction area, and two ends of the groove extend out of two ends of the edge of the shallow foundation building closest to the static pressure pile construction area to realize complete protection;

step 2), paving protective nets on two side walls of the groove, wherein each protective net is composed of a plurality of net units, the length of each net unit is consistent with the depth of the groove, the top of each protective net is fixed on the side wall of the groove through nails, the width of each net unit is 5 meters, the plurality of net units are distributed on the side walls of the groove side by side, the joints of the adjacent net units are overlapped to form a double-layer net structure with the width of 3 centimeters so as to ensure heat conduction, each protective net is made of heat conduction materials, in the embodiment, each protective net is made of stainless steel, each protective net is formed by binding a plurality of stainless steel wires, the diameter of each stainless steel wire is 3 millimeters, holes of each protective net are;

step 3), backfilling stones towards the groove until the stones are flush with the top of the groove, wherein the grain diameter of the stones is 3 cm +/-0.5 cm;

step 4), heating the protective net to 150 ℃, and injecting an asphalt composition which is heated to 160 ℃ to be in a hot melting state into the grooves to fill gaps between the stones;

step 5), after the groove is filled with the asphalt composition, compacting the top of the groove by a road roller;

and 6), stopping heating the protective net, standing and cooling for 72 hours, and then carrying out static pressure pile driving operation.

The preparation method of the asphalt composition comprises the following steps:

100kg of petroleum asphalt is put into a stirring kettle and heated to 160 ℃, 20kg of kerosene is added, the stirring is carried out for 10min at the rotating speed of 10r/min, 10kg of heat conducting powder is added, the stirring is carried out for 30min at the rotating speed of 30r/min, and the asphalt composition is obtained.

The preparation method of the heat conducting powder comprises the following steps:

adding 10kg of ammonium chloride, 5kg of barium chromate and 25kg of cuprous bromide into a stirring kettle, introducing nitrogen to discharge air, sealing the stirring kettle, heating to 500 ℃, rotating at a speed of 180r/min, stirring for 10min, discharging into a mold, cooling to form a heat conducting block, crushing by crushing equipment, and introducing into grinding equipment for grinding to obtain heat conducting powder with a particle size of 0.1 mm.

Example 2

A piling protection method for a perimeter static pressure pile of a shallow foundation building.

Compared with example 1, the difference is only that:

in the step 1), the depth of the groove is 10 meters.

In step 4), the protective net is heated to 160 ℃, and the asphalt composition which is heated to 165 ℃ to be in a hot melting state is injected into the grooves to fill the gaps of the stone blocks.

And 6), stopping heating the protective net, and standing and cooling for 84 hours.

Example 3

A piling protection method for a perimeter static pressure pile of a shallow foundation building.

Compared with example 1, the difference is only that:

in the step 1), the depth of the groove is 12 meters.

In step 4), the protective net is heated to 170 ℃, and the asphalt composition which is heated to 170 ℃ to be in a hot melting state is injected into the grooves to fill gaps between the stones.

And 6), stopping heating the protective net, and standing and cooling for 96 hours.

Example 4

A piling protection method for a perimeter static pressure pile of a shallow foundation building.

Compared with example 1, the difference is only that:

in the step 1), the depth of the groove is 11 meters.

In step 4), the protective net is heated to 180 ℃, and the asphalt composition which is heated to 168 ℃ to be in a hot melting state is injected into the grooves to fill gaps of the stone blocks.

And 6), stopping heating the protective net, and standing and cooling for 72 hours.

Example 5

A piling protection method for a perimeter static pressure pile of a shallow foundation building.

Compared with example 1, the difference is only that:

the preparation method of the asphalt composition comprises the following steps:

100kg of petroleum asphalt is put into a stirring kettle and heated to 160 ℃, 25kg of kerosene is added, the stirring is carried out for 10min at the rotating speed of 10r/min, 12kg of heat conducting powder is added, the rotating speed is 30r/min, and the stirring is carried out for 30min, so as to obtain the asphalt composition.

The preparation method of the heat conducting powder comprises the following steps:

adding 10kg of ammonium chloride, 7kg of barium chromate and 28kg of cuprous bromide into a stirring kettle, introducing nitrogen to discharge air, sealing the stirring kettle, heating to 500 ℃, rotating at a speed of 180r/min, stirring for 10min, discharging into a mold, cooling to form a heat conducting block, crushing by crushing equipment, and introducing into grinding equipment for grinding to obtain heat conducting powder with a particle size of 0.1 mm.

Example 6

A piling protection method for a perimeter static pressure pile of a shallow foundation building.

Compared with example 1, the difference is only that:

the preparation method of the asphalt composition comprises the following steps:

100kg of petroleum asphalt is put into a stirring kettle and heated to 160 ℃, 30kg of kerosene is added, the stirring is carried out for 10min at the rotating speed of 10r/min, 15kg of heat conducting powder is added, the stirring is carried out for 30min at the rotating speed of 30r/min, and the asphalt composition is obtained.

The preparation method of the heat conducting powder comprises the following steps:

adding 10kg of ammonium chloride, 10kg of barium chromate and 30kg of cuprous bromide into a stirring kettle, introducing nitrogen to discharge air, sealing the stirring kettle, heating to 500 ℃, rotating at a speed of 180r/min, stirring for 10min, discharging into a mold, cooling to form a heat conducting block, crushing by crushing equipment, and introducing into grinding equipment for grinding to obtain heat conducting powder with a particle size of 0.1 mm.

Experiment 1

The thermal conductivity of the samples prepared using the thermal conductive powder prepared in each example was measured by GBT3651-2008 "method for measuring metal high temperature thermal conductivity".

The specific assay data are detailed in table 2.

TABLE 2

	Thermal conductivity W/(m.K)
		Example 1	632
Example 2	631
		Example 3	633
Example 4	632
		Example 5	638
Example 6	635

According to the data in table 2, the thermal conductivity of the thermal conductive powder is higher than that of copper (the thermal conductivity of copper is about 400W/(m · K)), so that the thermal conductive powder has stronger thermal conductivity, and the thermal conductive powder is added into the asphalt composition to effectively improve the thermal conductivity of the asphalt composition, so that the heat of the protective net is quickly transferred to the asphalt composition, thereby ensuring that the asphalt is better kept in a molten state and better in fluidity and can better go deep into gaps of the stone to bond the stone, and meanwhile, when the stone wall needs to be disassembled, the asphalt composition can be quickly hot-melted, the bonding of the stone is cancelled, the stone is conveniently excavated, the stone wall is easy to disassemble, and the soil structure is convenient to recover.

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.