CN117569342A - Building construction technology for penetrating through dry ditch downwards - Google Patents

Abstract

The invention discloses a construction process for a downward penetrating dry ditch, which relates to the field of pipeline construction and comprises the following steps of firstly, preparing, determining the construction range and cleaning a surface; step two, excavating earthwork, which comprises excavating under the general condition and excavating under the special condition and carrying out drainage descending construction; thirdly, pipeline construction, wherein pipelines are paved according to construction requirements; and step four, backfilling the grooves by using original soil. The invention provides a construction process for a downward penetrating dry ditch, which protects an original pipeline through construction preparation, repairs a construction site through a groove backfilling step, ensures the original ecological environment to the greatest extent, has simple and convenient process flow and strong adaptability, and designs counter measures for the conditions of the downward penetrating pipeline, the too high underground water level and the groove ponding which are possibly encountered in the construction process, thereby ensuring the smooth construction.

Description

Building construction technology for penetrating through dry ditch downwards

Technical Field

The invention relates to the field of pipeline construction, in particular to a construction process for a downward penetrating dry ditch.

Background

With the rapid development of economy, the construction demands for water supply pipelines are gradually increased, and the water supply pipelines inevitably pass through some dry ditch buildings in the construction process.

In the prior art, a large excavation mode is generally used for construction, but the strain capacity of the construction process for the encountered special situation is poor, so how to provide a construction process for a downward penetrating dry ditch building, which has stronger adaptability to the special situation and smaller influence on the environment, is a problem which needs to be solved by the technicians in the field.

Disclosure of Invention

The invention aims to provide a construction process for a downward penetrating dry ditch building, which solves the problem of poor strain capacity for special conditions in the construction process.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention discloses a construction process for a dry trench penetrating downwards, which comprises the following steps of:

step one, preparing work, determining the construction range and clearing the table;

step two, excavating earthwork, which comprises excavating under the general condition and excavating under the special condition and carrying out drainage descending construction;

thirdly, pipeline construction, wherein pipelines are paved according to construction requirements;

and step four, backfilling the grooves by using original soil.

Preferably, the first step is performed according to the following steps:

1) Determining the size, bottom width and position of a water supply pipeline pipe ditch according to the design construction drawing and the stability conditions of the rock mass and the soil mass;

2) The original pipelines and buildings on the site are migrated and cleaned;

3) And arranging a protective guard and a construction passageway.

Preferably, the second step is implemented according to the following steps:

1) When the excavation depth is less than 5.0m, excavating a side slope by loam and powdery clay segments, and taking 1:1, when the bottom of the groove meets a quicksand layer, building and reinforcing the quicksand layer by using sand bags along the slope toe of the groove, wherein the building height is 3 to 4 layers;

2) When the excavation depth is greater than 5.0m, excavating a side slope to obtain 1:2, and arranging an excavation platform with the horizontal width of 1.5m from above the top surface of the pipe ditch every 5.0 m;

3) The distance between the soil piling slope feet on the grooves and the edges of the grooves is more than 2m, and the soil piling height is not more than 1.5m.

Preferably, the excavation is carried out according to the following steps:

1) The water supply pipeline trench is excavated by adopting an evacuation method to carry out layered excavation, two back-shovel excavators are used for evacuating the upper and lower steps, a back-shovel excavator is arranged on the base to brush and trim the slope, the ratio of the excavated slope is ensured, three loaders are arranged on the top of the trench, excavated soil is dumped to a temporary soil stacking area, the soil-rock mixing work is completed, a 20cm protection layer is reserved before the mechanical excavation is carried out to the bottom of a designed trench, and the over-excavation is prevented;

2) Timely checking geological conditions in the trench excavation process, performing foundation trench inspection after the geological conditions are excavated to the designed elevation, and performing next working procedure construction after the foundation trench inspection is qualified;

3) Reasonably slope-releasing excavation is carried out according to the soil quality of the site after the construction area is subjected to precipitation, and when the excavation depth is more than 5.0m, a construction platform with the horizontal width of 1.5m is arranged every 5.0m above the top surface of the pipe ditch; when the excavation depth is more than 5m, placing a precipitation well on a layer-to-layer platform; in the excavation process, the position of the central line is monitored by using a total station, the height of the bottom of the tank is monitored at any time by using a level gauge, over-excavation or under-excavation is avoided, and the size of the bottom of the foundation tank is guaranteed to be designed.

Preferably, the special case of excavation is carried out according to the following steps:

1) Firstly, measuring the approximate positions of an in-service pipeline and an optical cable according to a pipeline detector, and manually digging a strip-shaped probe pit along the direction perpendicular to the in-service pipeline, wherein the width of the strip-shaped probe pit is about 1m, and the length and the depth of the strip-shaped probe pit are up to the point of digging the pipeline and the optical cable;

2) When the shovel is used for digging soil by adopting a flat shovel method, loose soil is cleaned while digging, a trencher needs to pay attention to the change of a soil layer at any time, if soft soil or a sandy soil layer appears in a hard soil layer, special care is needed when digging, and all the pipelines and the ditches within 5m around the optical cable are dug when digging;

3) After the in-service pipeline is excavated, if the length of the exposed section is more than 3m, temporary support protection is needed to be adopted for the exposed pipeline; if the pipeline is accompanied with the optical cable, the optical cable and the in-service pipeline are temporarily bound together, and the optical cable is restored to the original position when backfilling.

Preferably, the drainage construction is carried out according to the following steps:

1) When the underground water level is high, carrying out drainage construction, and when a groove is dug on a hillside, firstly digging a water interception ditch so as to remove surface runoff on the hillside; the deep excavation is carried out by layers, so that collapse is prevented; the excessive excavation is avoided by excavating the stone; when the rock is underexcavated, artificial excavation is adopted, and the rock overexcavation amount is controlled according to 15cm on average;

2) The water collection and draining mode is adopted in the bottom of the ditch, drainage ditches are arranged on two sides of the ditch, the section size of the drainage ditches is 0.3x0.4m, the gradient of the drainage ditches is 2%, water collection wells are arranged every 40-60 m, the bottom of each water collection well is 50cm deeper than the bottom of the drainage ditches, water collection is pumped and drained to a simple sedimentation tank by a sewage pump, special persons are arranged for pumping and draining during dewatering, and the operation and construction of the ditch are guaranteed.

Preferably, the fourth step is implemented according to the following steps:

1) Cleaning the grooves, namely, after the tree roots and garbage sundries on the foundation soil or the surface of the foundation are treated, cleaning the grooves, and completely cleaning out collapsed and loosened materials;

2) Backfilling the underarm corners of the pipes by adopting undisturbed natural soil, uniformly blanking from two sides of the pipes during backfilling, wherein the backfilling height difference of each side does not exceed the filling thickness of one layer, the virtual paving thickness of each layer of layered backfilling is 200mm, and manually paving and leveling each layer of virtual paving layer;

3) Backfilling in 20cm of the pipe body and the pipe top, and after the backfilling of the underarm angle of the pipe is finished, backfilling in 20cm of the pipe body and the pipe top, wherein the backfilling in the area adopts undisturbed natural soil for backfilling, the backfilling should be uniformly spread in the pipe ditch, and the backfilling is uniformly performed simultaneously along the two sides of the pipe, the virtual pavement thickness of each layer of backfilling is less than 200mm, and the pipe position is not disturbed;

4) Backfilling to the designed elevation, backfilling the pipe body to the designed elevation by adopting undisturbed natural soil, wherein the compactness is more than or equal to 0.85, the virtual paving thickness of each backfill layer in the area is less than 200mm, the backfill soil is paved flatly by adopting a small machine, the backfill compaction is mainly performed by adopting the small machine compaction, the manual compaction is auxiliary, the compaction coefficient of each layer is detected during the backfill, and the backfill layer is subjected to lower backfill after inspection and acceptance by a report supervision engineer.

Compared with the prior art, the invention has the beneficial technical effects that:

the invention provides a construction process for a downward penetrating dry ditch, which protects an original pipeline through construction preparation, repairs a construction site through a groove backfilling step, so as to restore the original ecological environment to the greatest extent.

Drawings

The invention is further described with reference to the following description of the drawings.

FIG. 1 is a flow chart of a construction process of a dry trench penetrating under the invention;

FIG. 2 is a cross-sectional view of a trench excavation in accordance with the present invention;

FIG. 3 is a standard cross-sectional view of the trench excavation of the present invention;

FIG. 4 is a cross-sectional view of the backfilled underarm corner of the tube of the present invention;

FIG. 5 is a 20cm backfill section of the pipe body and pipe roof of the present invention;

FIG. 6 is a cross-sectional view of the backfill to design level of the present invention.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1-3, a construction process for a underpass dry ditch building comprises the following steps:

step one, preparing work, determining the construction range and clearing the table;

step two, excavating earthwork, which comprises excavating under the general condition and excavating under the special condition and carrying out drainage descending construction;

thirdly, pipeline construction, wherein pipelines are paved according to construction requirements;

and step four, backfilling the grooves by using original soil.

Specifically, the first step is implemented according to the following steps:

1) Determining the size, bottom width and position of a water supply pipeline pipe ditch according to the design construction drawing and the stability conditions of the rock mass and the soil mass;

2) The original pipelines and buildings on the site are migrated and cleaned;

3) And arranging a protective guard and a construction passageway.

Specifically, the second step is implemented according to the following steps:

1) When the excavation depth is less than 5.0m, excavating a side slope by loam and powdery clay segments, and taking 1:1, when the bottom of the groove meets a quicksand layer, building and reinforcing the quicksand layer by using sand bags along the slope toe of the groove, wherein the building height is 3 to 4 layers;

2) When the excavation depth is greater than 5.0m, excavating a side slope to obtain 1:2, and arranging an excavation platform with the horizontal width of 1.5m from above the top surface of the pipe ditch every 5.0 m;

3) The distance between the soil piling slope feet on the grooves and the edges of the grooves is more than 2m, and the soil piling height is not more than 1.5m.

Specifically, the general excavation is performed according to the following steps:

1) The water supply pipeline trench is excavated by adopting an evacuation method to carry out layered excavation, two back-shovel excavators are used for evacuating the upper and lower steps, a back-shovel excavator is arranged on the base to brush and trim the slope, the ratio of the excavated slope is ensured, three loaders are arranged on the top of the trench, excavated soil is dumped to a temporary soil stacking area, the soil-rock mixing work is completed, a 20cm protection layer is reserved before the mechanical excavation is carried out to the bottom of a designed trench, and the over-excavation is prevented;

2) Timely checking geological conditions in the trench excavation process, performing foundation trench inspection after the geological conditions are excavated to the designed elevation, and performing next working procedure construction after the foundation trench inspection is qualified;

3) Reasonably slope-releasing excavation is carried out according to the soil quality of the site after the construction area is subjected to precipitation, and when the excavation depth is more than 5.0m, a construction platform with the horizontal width of 1.5m is arranged every 5.0m above the top surface of the pipe ditch; when the excavation depth is more than 5m, placing a precipitation well on a layer-to-layer platform; in the excavation process, the position of the central line is monitored by using a total station, the height of the bottom of the tank is monitored at any time by using a level gauge, over-excavation or under-excavation is avoided, and the size of the bottom of the foundation tank is guaranteed to be designed.

Specifically, the excavation under the special condition is implemented according to the following steps:

1) Firstly, measuring the approximate positions of an in-service pipeline and an optical cable according to a pipeline detector, and manually digging a strip-shaped probe pit along the direction perpendicular to the in-service pipeline, wherein the width of the strip-shaped probe pit is about 1m, and the length and the depth of the strip-shaped probe pit are up to the point of digging the pipeline and the optical cable;

2) When the shovel is used for digging soil by adopting a flat shovel method, loose soil is cleaned while digging, a trencher needs to pay attention to the change of a soil layer at any time, if soft soil or a sandy soil layer appears in a hard soil layer, special care is needed when digging, and all the pipelines and the ditches within 5m around the optical cable are dug when digging;

3) After the in-service pipeline is excavated, if the length of the exposed section is more than 3m, temporary support protection is needed to be adopted for the exposed pipeline; if the pipeline is accompanied with the optical cable, the optical cable and the in-service pipeline are temporarily bound together, and the optical cable is restored to the original position when backfilling.

Specifically, the drainage construction is implemented according to the following steps:

1) When the underground water level is high, carrying out drainage construction, and when a groove is dug on a hillside, firstly digging a water interception ditch so as to remove surface runoff on the hillside; the deep excavation is carried out by layers, so that collapse is prevented; the excessive excavation is avoided by excavating the stone; when the rock is underexcavated, artificial excavation is adopted, and the rock overexcavation amount is controlled according to 15cm on average;

2) The water collection and draining mode is adopted in the bottom of the ditch, drainage ditches are arranged on two sides of the ditch, the section size of the drainage ditches is 0.3x0.4m, the gradient of the drainage ditches is 2%, water collection wells are arranged every 40-60 m, the bottom of each water collection well is 50cm deeper than the bottom of the drainage ditches, water collection is pumped and drained to a simple sedimentation tank by a sewage pump, special persons are arranged for pumping and draining during dewatering, and the operation and construction of the ditch are guaranteed.

Specifically, the earth and stone deployment work in the earth excavation process should follow the principle:

1) Utilized nearby to reduce traffic.

2) The temporary road is filled in advance by excavating earthwork.

3) High-to-low transfer: it should be noted that construction is possible and convenient, and that ascending earth-moving is avoided and reduced as much as possible.

4) Economic rationality: an economic comparison of remote utilization with nearby borrowing (a comparison of the cost of moving excavated fill and borrowing) should be made.

5) Cost of remote transportation and utilization: transportation costs, loading and unloading costs, etc.

6) Borrowing cost: excavation cost, occupation of land and compensation cost of green seedlings, occupation of spoil and transportation cost.

7) According to the topography condition and the construction condition, a proper transportation mode is selected, and a reasonable economic distance is determined for analyzing whether the engineering soil is transported or borrowed.

8) The earthwork allocation of the 'moving and digging filling' naturally considers the problem of economic distance, but the economic distance is not the only index, and the land occupation of the abandoned party or the borrowed party is comprehensively considered, so that the loss of young seedlings, the influence on agricultural production and the like are compensated. Sometimes the displacement fill is somewhat beyond the distance: the transportation costs may be somewhat higher, but if less space is available, the agricultural production is less affected, which is also economical as a whole.

9) Different earthwork and stone should be respectively allocated according to engineering requirements to ensure the stability of foundation and the material supply of artificial structures.

10 The earthwork allocation is to follow the unified management of construction units for borrowing soil and spoil, the spoil and borrow soil places are designated by the construction units, borrow soil is to be combined with topography, farmland planning and the like to select borrow soil places, and measures such as borrow soil returning, soil preparation and farmland making are comprehensively considered; the waste soil should occupy no or little cultivated land, and the waste soil should be leveled into cultivated land under possible conditions, so as to prevent the waste soil from being scattered and piled up randomly or blocking rivers and damaging farmlands.

11 According to the engineering quantity of the design drawing, the earth and stone excavation backfill balance is achieved as much as possible, the earth and stone dumping quantity and the transporting distance are reduced, dust pollution is reduced, and the environment is protected.

As shown in fig. 4-6, the fourth step is implemented according to the following steps:

1) Cleaning the grooves, namely, after the tree roots and garbage sundries on the foundation soil or the surface of the foundation are treated, cleaning the grooves, and completely cleaning out collapsed and loosened materials;

2) Backfilling the underarm corners of the pipes by adopting undisturbed natural soil, uniformly blanking from two sides of the pipes during backfilling, wherein the backfilling height difference of each side does not exceed the filling thickness of one layer, the virtual paving thickness of each layer of layered backfilling is 200mm, and manually paving and leveling each layer of virtual paving layer;

3) Backfilling in 20cm of the pipe body and the pipe top, and after the backfilling of the underarm angle of the pipe is finished, backfilling in 20cm of the pipe body and the pipe top, wherein the backfilling in the area adopts undisturbed natural soil for backfilling, the backfilling should be uniformly spread in the pipe ditch, and the backfilling is uniformly performed simultaneously along the two sides of the pipe, the virtual pavement thickness of each layer of backfilling is less than 200mm, and the pipe position is not disturbed;

4) Backfilling to the designed elevation, backfilling the pipe body to the designed elevation by adopting undisturbed natural soil, wherein the compactness is more than or equal to 0.85, the virtual paving thickness of each backfill layer in the area is less than 200mm, the backfill soil is paved flatly by adopting a small machine, the backfill compaction is mainly performed by adopting the small machine compaction, the manual compaction is auxiliary, the compaction coefficient of each layer is detected during the backfill, and the backfill layer is subjected to lower backfill after inspection and acceptance by a report supervision engineer.

Specifically, the following points in the construction process of backfilling the groove:

1) And after the pipeline and the accessory are installed and accepted, the pipeline and the accessory are gripped to backfill the pipe ditch. The pipelines which are completely installed are not allowed to be exposed for a long time, and are not allowed to span the flood season, so that pipeline damage and flood season drift tube accidents are avoided.

2) When backfilling and compacting in layers, the adjacent stubble should be trapezoid, the step difference must not exceed 1 filling section; the rolling of the joint should overlap each other by at least 1.0m, and the rolling should not be missed.

3) The pipe is laid taking care that the maximum thickness of the earth of the pipe cannot exceed the allowable thickness of the earth of the pipe. Designing the thickness of the pipeline earthing not smaller than 1.3m, and the maximum earthing thickness not larger than 3.0m; for the sections with the thickness of the covering soil not meeting the minimum requirement, the thickness of the covering soil needs to be increased; and when the thickness of the covering soil of the pipeline of the local section exceeds 3.0m, purchasing and laying the pipeline according to the thickness of the covering soil.

4) In the pipe ditch backfilling process, the pipeline should be protected from the impact of falling earth and stone blocks, the direct collision of compaction equipment and other potential damage risks.

5) After each layer is backfilled, checking whether the coating or the sealing sleeve of the pipeline is damaged or not, and if so, immediately repairing.

6) The compaction index must be determined by an on-site rolling test, and the filling construction can be carried out after the witness of a supervision engineer is qualified.

7) Backfill material filled on the same day should be compacted before the end of the day's work.

8) The moisture content of the backfill is preferably near the optimum moisture content for the soil and compaction tool used.

9) After the pipeline is laid, a mark is arranged on the ground.

10 When the pipeline section is in pebbles, rocks or gravel, the part below 0.2m of the pipe top is backfilled with fine soil or surface loam, and the backfilling is not performed with the lower layer of gravel material.

11 Backfill from two sides of the pipeline to the top of the pipeline must be symmetrically compacted in layers, and single-side backfill or bulldozer pushing and filling from one side into the ditch is forbidden, so that the axial displacement of the pipeline and the deformation of the joint are avoided.

12 The backfill requirement of the pipe top within 0.5m is the same as that of the backfill on two sides of the pipeline, and a heavy hammer or a large machine is not needed to be used for tamping.

13 Backfilling with 1m ³ The excavator is uniformly and symmetrically backfilled to two sides, and the frog ramming machine is used for ramming, so that the pipe top and the pipe groove are backfilled to more than 1.0m to allow the large-scale earthmoving machine to span the upper part.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims (7)

1. A building construction process of a downward penetrating dry ditch is characterized in that: the method comprises the following steps:

step one, preparing work, determining the construction range and clearing the table;

step two, excavating earthwork, which comprises excavating under the general condition and excavating under the special condition and carrying out drainage descending construction;

thirdly, pipeline construction, wherein pipelines are paved according to construction requirements;

and step four, backfilling the grooves by using original soil.

2. The under-penetrating dry ditch building construction process of claim 1, wherein: the first step is implemented according to the following steps:

1) Determining the size, bottom width and position of a water supply pipeline pipe ditch according to the design construction drawing and the stability conditions of the rock mass and the soil mass;

2) The original pipelines and buildings on the site are migrated and cleaned;

3) And arranging a protective guard and a construction passageway.

3. The under-penetrating dry ditch building construction process of claim 1, wherein: the second step is implemented according to the following steps:

1) When the excavation depth is less than 5.0m, excavating a side slope by loam and powdery clay segments, and taking 1:1, when the bottom of the groove meets a quicksand layer, building and reinforcing the quicksand layer by using sand bags along the slope toe of the groove, wherein the building height is 3 to 4 layers;

2) When the excavation depth is greater than 5.0m, excavating a side slope to obtain 1:2, and arranging an excavation platform with the horizontal width of 1.5m from above the top surface of the pipe ditch every 5.0 m;

3) The distance between the soil piling slope feet on the grooves and the edges of the grooves is more than 2m, and the soil piling height is not more than 1.5m.

4. The under-penetrating dry ditch building construction process of claim 1, wherein: the excavation is generally carried out according to the following steps:

1) The water supply pipeline trench is excavated by adopting an evacuation method to carry out layered excavation, two back-shovel excavators are used for evacuating the upper and lower steps, a back-shovel excavator is arranged on the base to brush and trim the slope, the ratio of the excavated slope is ensured, three loaders are arranged on the top of the trench, excavated soil is dumped to a temporary soil stacking area, the soil-rock mixing work is completed, a 20cm protection layer is reserved before the mechanical excavation is carried out to the bottom of a designed trench, and the over-excavation is prevented;

2) Timely checking geological conditions in the trench excavation process, performing foundation trench inspection after the geological conditions are excavated to the designed elevation, and performing next working procedure construction after the foundation trench inspection is qualified;

3) Reasonably slope-releasing excavation is carried out according to the soil quality of the site after the construction area is subjected to precipitation, and when the excavation depth is more than 5.0m, a construction platform with the horizontal width of 1.5m is arranged every 5.0m above the top surface of the pipe ditch; when the excavation depth is more than 5m, placing a precipitation well on a layer-to-layer platform; in the excavation process, the position of the central line is monitored by using a total station, the height of the bottom of the tank is monitored at any time by using a level gauge, over-excavation or under-excavation is avoided, and the size of the bottom of the foundation tank is guaranteed to be designed.

5. The under-penetrating dry ditch building construction process of claim 1, wherein: the excavation under the special condition is carried out according to the following steps:

1) Firstly, measuring the approximate positions of an in-service pipeline and an optical cable according to a pipeline detector, and manually digging a strip-shaped probe pit along the direction perpendicular to the in-service pipeline, wherein the width of the strip-shaped probe pit is about 1m, and the length and the depth of the strip-shaped probe pit are up to the point of digging the pipeline and the optical cable;

2) When the shovel is used for digging soil by adopting a flat shovel method, loose soil is cleaned while digging, a trencher needs to pay attention to the change of a soil layer at any time, if soft soil or a sandy soil layer appears in a hard soil layer, special care is needed when digging, and all the pipelines and the ditches within 5m around the optical cable are dug when digging;

3) After the in-service pipeline is excavated, if the length of the exposed section is more than 3m, temporary support protection is needed to be adopted for the exposed pipeline; if the pipeline is accompanied with the optical cable, the optical cable and the in-service pipeline are temporarily bound together, and the optical cable is restored to the original position when backfilling.

6. The under-penetrating dry ditch building construction process of claim 1, wherein: the water lowering and draining construction is implemented according to the following steps:

1) When the underground water level is high, carrying out drainage construction, and when a groove is dug on a hillside, firstly digging a water interception ditch so as to remove surface runoff on the hillside; the deep excavation is carried out by layers, so that collapse is prevented; the excessive excavation is avoided by excavating the stone; when the rock is underexcavated, artificial excavation is adopted, and the rock overexcavation amount is controlled according to 15cm on average;

2) The water collection and draining mode is adopted in the bottom of the ditch, drainage ditches are arranged on two sides of the ditch, the section size of the drainage ditches is 0.3x0.4m, the gradient of the drainage ditches is 2%, water collection wells are arranged every 40-60 m, the bottom of each water collection well is 50cm deeper than the bottom of the drainage ditches, water collection is pumped and drained to a simple sedimentation tank by a sewage pump, special persons are arranged for pumping and draining during dewatering, and the operation and construction of the ditch are guaranteed.

7. The under-penetrating dry ditch building construction process of claim 1, wherein: the fourth step is implemented according to the following steps:

1) Cleaning the grooves, namely, after the tree roots and garbage sundries on the foundation soil or the surface of the foundation are treated, cleaning the grooves, and completely cleaning out collapsed and loosened materials;

2) Backfilling the underarm corners of the pipes by adopting undisturbed natural soil, uniformly blanking from two sides of the pipes during backfilling, wherein the backfilling height difference of each side does not exceed the filling thickness of one layer, the virtual paving thickness of each layer of layered backfilling is 200mm, and manually paving and leveling each layer of virtual paving layer;

3) Backfilling in 20cm of the pipe body and the pipe top, and after the backfilling of the underarm angle of the pipe is finished, backfilling in 20cm of the pipe body and the pipe top, wherein the backfilling in the area adopts undisturbed natural soil for backfilling, the backfilling should be uniformly spread in the pipe ditch, and the backfilling is uniformly performed simultaneously along the two sides of the pipe, the virtual pavement thickness of each layer of backfilling is less than 200mm, and the pipe position is not disturbed;

4) Backfilling to the designed elevation, backfilling the pipe body to the designed elevation by adopting undisturbed natural soil, wherein the compactness is more than or equal to 0.85, the virtual paving thickness of each backfill layer in the area is less than 200mm, the backfill soil is paved flatly by adopting a small machine, the backfill compaction is mainly performed by adopting the small machine compaction, the manual compaction is auxiliary, the compaction coefficient of each layer is detected during the backfill, and the backfill layer is subjected to lower backfill after inspection and acceptance by a report supervision engineer.