CN113882400B - Construction method for dense backfill structures on two sides of pipeline - Google Patents
Construction method for dense backfill structures on two sides of pipeline Download PDFInfo
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- CN113882400B CN113882400B CN202111042993.5A CN202111042993A CN113882400B CN 113882400 B CN113882400 B CN 113882400B CN 202111042993 A CN202111042993 A CN 202111042993A CN 113882400 B CN113882400 B CN 113882400B
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
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Abstract
The invention relates to a construction method of dense backfill structures on two sides of a pipeline, and relates to the technical field of pipeline construction. According to the construction method of the backfill structure with the two sides of the pipeline being compact, when each backfill layer is constructed, the actual compaction degree is detected and compared with the designed compaction degree, whether the tamping force of the small-sized tamper is qualified or not is determined according to the comparison result, and when the compaction force is judged to be unqualified, the tamping height of the small-sized tamper and the tamping times of the backfill layers are automatically adjusted through the control of the controller, and when the tamping height or the tamping times are adjusted and the tamping process is carried out according to the corresponding tamping height or the corresponding tamping times, whether the tamping height is corrected or not is judged according to the comparison result of the rebounding amount of the hammer and the preset rebounding amount through detecting the rebounding amount of the hammer, so that the automatic control of the small-sized tamper is improved, and the pipeline construction efficiency is further improved.
Description
Technical Field
The invention relates to the technical field of pipeline construction, in particular to a construction method of dense backfill structures on two sides of a pipeline.
Background
An underground pipe is a pipe laid underground for transporting liquids, gases or loose solids. The Chinese ancient times have adopted underground drainage pipelines fired by pottery clay.
With the continuous acceleration of the urbanization process and the development of municipal engineering, underground pipelines are more and more widely applied. The underground pipeline can be subjected to bending deformation, cracking and damage under the action of vibration loads such as traffic loads and construction, so that the pipeline fails and even secondary disasters are caused.
The prior art does not have the correlation technique to realize backfilling the backfill structure automatically controlled, and carries out the tamping in-process through manual control, can lead to the unqualified situation of pipeline of construction because of multiple factor to the control accuracy of rammer in the construction equipment is not high in the work progress, thereby leads to the pipeline efficiency of construction low.
Disclosure of Invention
Therefore, the invention provides a construction method of dense backfill structures on two sides of a pipeline, which is used for solving the problem of low pipeline construction efficiency caused by low control precision of a compactor in construction equipment in the construction process in the prior art.
In order to achieve the above object, the present invention provides a backfill structure with dense pipe sides, including a middle coarse sand layer, a first rubber-stone chip mixing layer, a stone chip backfill layer, a second rubber-stone chip mixing layer and a common backfill layer, where the middle coarse sand layer is used as a pipe base for carrying the pipe, the first rubber-stone chip mixing layer is located above the middle coarse sand layer on the pipe sides, the stone chip backfill layer is located above the first rubber-stone chip mixing layer on the pipe sides, the upper plane of the stone chip backfill layer is lower than the top of the pipe, the second rubber-stone chip mixing layer is located above the stone chip backfill layer and covers the top of the whole pipe, and the common backfill layer is located above the second rubber-stone chip mixing layer.
The middle coarse sand layer, the first rubber stone chip mixing layer, the stone chip backfill layer and the second rubber stone chip mixing layer are not higher than 300mm, the common backfill soil layer is not lower than 500mm, the rubber proportion in the first rubber stone chip mixing layer is 70-80%, the stone chip proportion is 20-30%, the rubber proportion in the second rubber stone chip mixing layer is 75-85%, and the stone chip proportion is 15-25%.
The invention also provides a construction method of the dense backfill structures on two sides of the pipeline, which comprises the following steps:
step S1, determining the position of a pipeline trench according to a construction drawing, excavating the pipeline trench, and erecting backfill construction equipment on two sides of the pipeline trench after the excavation is finished;
step S2, when the erection is finished, the middle coarse sand layer is backfilled to be used as a pipe base, and the middle coarse sand layer after backfilling is tamped to the designed corresponding compaction degree through a small-sized tamping machine;
step S3, adjusting and placing the pipeline to the upper part of the medium-coarse sand layer, and limiting and fixing the pipeline through a limiting device;
step S4, when the fixation is finished, the first rubble and stone chip mixing layer, the stone chip backfill layer, the second rubble and stone chip mixing layer and the common backfill soil layer are backfilled layer by layer, and the small-sized tamper is controlled to tamp layer by layer according to the designed compaction degree during backfilling construction;
when each backfill layer is constructed, the controller determines the tamping times Ci of the backfill layer by a first tamping height G1 according to the designed compaction degree U0, tamps the backfill layer by the determined first tamping height G1 and tamping times Ci, acquires the detection result of the actual compaction degree U of the backfill layer by a compaction degree detector when tamping is completed, acquires the backfill layer descending amount H of three times of tamping after the tamping times Ci detected by a laser level instrument if U is less than U0, compares the backfill layer descending amount H with the preset backfill layer descending amount H0 respectively, determines that the tamping force of the small-sized tamper is insufficient if H is less than H0, determines that the tamping times of the small-sized tamper are insufficient if H is more than H0, and determines that the tamping is completed if U0;
when the controller judges that the tamping force of the small-sized tamper is unqualified, the controller controls and adjusts the tamping height of the small-sized tamper, and when the controller judges that the tamping times of the small-sized tamper are insufficient, the controller controls and adjusts the tamping times of the small-sized tamper;
when the controller controls to tamp the backfill layer by adjusting the tamping height or the tamping times, the controller obtains the rebound amount of the hammer head of the small-sized tamper, further judges whether the tamping force of the small-sized tamper is qualified or not according to the comparison result of the rebound amount and the preset rebound amount, and corrects the tamping height when the tamping force is unqualified.
Further, when the number of times of tamping the backfill layer is determined according to the preset compaction degree, the controller selects the corresponding number of times of tamping according to the comparison result of the designed compaction degree U0 and the preset compaction degree and controls the small-sized tamper to tamp the backfill layer,
the controller is provided with a first preset compaction degree U1, a second preset compaction degree U2, a third preset compaction degree U3, a first tamping frequency C1, a second tamping frequency C2 and a third tamping frequency C3, wherein U1 is more than U2 and less than U3, C1 is more than C2 and less than C3,
when the U1 is not less than U0 and is more than U2, the controller sets the tamping times of the small-sized tamper to the backfill layer to be first tamping times C1;
when U2 is not less than U0 and is more than U3, the controller sets the tamping times of the small-sized tamper to the backfill layer as second tamping times C2;
when the U0 is more than or equal to U3, the controller sets the tamping times of the small-sized tamper to the backfill layer to be a third tamping time C3.
Further, when the controller determines that the tamping times are finished, the small-sized tamper is controlled to tamp the backfill layer, when tamping is finished, a detection result of the compaction degree detector on the actual compaction degree U of the backfill layer is obtained, if U is less than U0, the controller obtains the backfill layer descending amount H tamped three times after the tamping times Ci detected by the laser level, sets i to be 1, 2 and 3, compares the backfill layer descending amount H with a preset backfill layer descending amount H0, if H is less than H0, the controller determines that the tamping force of the small-sized tamper is insufficient, if H is more than H0, the controller determines that the tamping times of the small-sized tamper are insufficient, and if U is more than or equal to U0, the controller determines that tamping is finished.
Further, when H is less than H0, the controller calculates a first drop amount difference Δ Ha between the backfill layer drop amount H and a preset backfill layer drop amount H0, sets Δ Ha to H1-H, and selects a corresponding height adjustment amount according to a comparison result between the first drop amount difference and the preset drop amount difference to adjust the first ramming height, the controller sets the adjusted ramming height to a second ramming height G2, sets G2 to G1+ Δ Gj, where Δ Gj is a jth height adjustment amount.
Further, when H > H0, the controller calculates a second descending amount difference Δ Hb between the backfill layer descending amount H and a second preset backfill layer descending amount H2, sets Δ Hb to H-H2, and selects a ramming frequency adjustment coefficient according to a comparison result between the second descending amount difference and a preset descending amount difference to adjust the ramming frequency, and sets the adjusted ramming frequency to C ', sets C' to Ci × Kn, sets i to 1, 2, 3, and is an nth ramming frequency adjustment coefficient.
Further, when the controller controls the small-sized tamper to tamp the backfill layer by the adjusted tamping height or the adjusted tamping times, the controller obtains the rebound quantity D of the hammer head of the tamper, compares the rebound quantity D with a preset rebound quantity D0, judges that the tamping force of the small-sized tamper is still insufficient if D is less than D0, judges that the tamping force of the small-sized tamper is qualified if D is greater than or equal to D0, and controls the small-sized tamper to tamp the backfill layer by the adjusted tamping height or the adjusted tamping times.
Further, when D is less than D0, the controller calculates a difference value delta D between the rebound quantity D and a preset rebound quantity D0, sets delta D to D0-D, selects a corresponding height correction coefficient according to a comparison result of the difference value and the preset rebound quantity to correct the ramming height, and sets the corrected ramming height to be a third ramming height G3 and G3 to G2 × Rj ', wherein Rj ' is a jth ' height correction coefficient.
Further, when the controller controls the small-sized tamper to complete tamping on the backfill layer according to the adjusted tamping times or the adjusted tamping height, and U is less than U0, the controller calculates a compaction difference value delta U between the actual compaction U and a designed compaction U0, sets delta U as U0-U, selects a corresponding adjustment quantity correction coefficient according to a comparison result of the compaction difference value and a preset compaction difference value to correct the height adjustment quantity, sets the corrected height adjustment quantity as delta G ', sets delta G' as delta Ge x, wherein delta Ge is the e-th height adjustment quantity, and Xs is the s-th adjustment quantity correction coefficient.
Further, the controller is provided with a maximum tamping height Gmax, compares the third tamping height G3 with the maximum tamping height Gmax when the controller sets the tamping height to the third tamping height G3, determines that the tamping height is high if G3 is not less than Gmax, and the small-sized tamper cannot be operated, calculates a height difference Δ G between the third tamping height G3 and the maximum tamping height Gmax, sets Δ G to G3-Gmax, and corrects the number of times of tamping based on a comparison result of the difference and a preset height difference, and sets the number of times of tamping to C ', sets C ' × Qn, and Qn ' is an nth-number-of-tamping correction coefficient.
Compared with the prior art, the construction method has the beneficial effects that the medium coarse sand is used as the bottommost layer of the backfill structure, the rubble chip mixed material is used as the damping buffer layer of the backfill structure, each layer is tamped to the preset compaction degree, the rubble chip mixed layer is divided into two layers, the construction is carried out by using a tiled structure and the tamping is carried out to the preset compaction degree, and the energy dissipation and shock resistance of the backfill structure are improved.
Furthermore, when each backfill layer is constructed, the actual compaction degree is detected and compared with the designed compaction degree, whether the tamping force of the small-sized tamper is qualified or not is determined according to the comparison result, and when the tamping force is judged to be unqualified, the controller is used for controlling the automatic tamping height of the small-sized tamper and the tamping times of the backfill layer to be adjusted, so that the automatic control of the small-sized tamper is improved, and the pipeline construction efficiency is further improved.
Particularly, the tamping times of the small-sized tamper to the backfill layer are determined according to the comparison result of the designed compaction degree and the preset compaction degree, when the backfill layer is tamped by determining the tamping height and the tamping times, the judgment is further carried out according to the comparison result of the actual compaction degree and the designed compaction degree, and when the judgment is unqualified, the tamping height or the tamping times are determined to be adjusted according to the descending amount of the backfill layer, so that the control precision of the small-sized tamper is further improved, and the construction efficiency of the pipeline is further improved.
Particularly, when the tamping height or the tamping times are adjusted and the tamping process is carried out according to the corresponding tamping height or the corresponding tamping times, the control precision of the small-sized tamper is further improved by detecting the rebound quantity of the hammer head and judging whether the tamping height is corrected or not according to the comparison result of the rebound quantity of the hammer head and the preset rebound quantity, and therefore the construction efficiency of the pipeline is further improved.
Drawings
FIG. 1 is a schematic structural view of a dense backfill structure on two sides of a pipeline according to the invention;
FIG. 2 is a flow chart of a construction method of a dense backfill structure on two sides of a pipeline according to the invention;
FIG. 3 is a schematic structural diagram of a construction device for a dense backfill structure on two sides of a pipeline according to the present invention.
In the figure, 1-medium coarse sand layer, 2-first rubble chip mixing layer, 3-rubble chip backfill layer, 4-second rubble chip mixing layer, 5-pipeline, 6-common backfill soil layer, 7-backfill construction equipment, 8-small-sized tamper, 9-limiting device, 10-controller, 11-laser range finder and 12-hammer.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a dense backfill structure on two sides of a pipeline according to the present invention.
The invention provides a backfill structure with compact two sides of a pipeline, which comprises a medium-coarse sand layer 1, a first rubble and stone chip mixing layer 2, a stone chip backfill layer 3, a second rubble and stone chip mixing layer 4 and a common backfill soil layer 6, wherein the medium-coarse sand layer 1 is used as a pipe base and used for bearing the pipeline 5, the first rubble and stone chip mixing layer 2 is positioned above the medium-coarse sand layer 1 on the two sides of the pipeline, the stone chip backfill layer 3 is positioned above the first rubble and stone chip mixing layer 2 on the two sides of the pipeline, the upper plane of the stone chip backfill layer 3 is lower than the top of the pipeline, the second rubble and stone chip mixing layer 4 is positioned on the stone chip backfill layer 3 and covers the top of the whole pipeline, and the common backfill soil layer 6 is positioned above the second rubble and stone chip mixing layer 4.
The middle coarse sand layer, the first rubber stone chip mixing layer, the stone chip backfill layer and the second rubber stone chip mixing layer are not higher than 300mm, the common backfill soil layer is not lower than 500mm, the rubber proportion in the first rubber stone chip mixing layer is 70-80%, the stone chip proportion is 20-30%, the rubber proportion in the second rubber stone chip mixing layer is 75-85%, and the stone chip proportion is 15-25%.
Preferably, in one embodiment of the present invention, the rubber proportion in the first rubber-stone chip mixing layer is 80%, the stone chip proportion is 20%, the rubber proportion in the second rubber-stone chip mixing layer is 85%, and the stone chip proportion is 15%.
Preferably, in one embodiment of the present invention, the rubber proportion in the first rubber-stone chip mixed layer is 70%, the stone chip proportion is 30%, the rubber proportion in the second rubber-stone chip mixed layer is 75%, and the stone chip proportion is 25%.
Preferably, in one embodiment of the present invention, the rubber proportion in the first rubber-stone chip mixed layer is 75%, the stone chip proportion is 25%, and the rubber proportion in the second rubber-stone chip mixed layer is 80%, and the stone chip proportion is 20%.
Particularly, the middle coarse sand is used as the bottommost layer of the backfill structure, the rubber stone chip mixed material is used as a damping buffer layer of the backfill structure, each layer is tamped to the preset compaction degree, the rubber stone chip mixed layer is divided into two layers, construction is carried out on the tiled structure and the rubber stone chip mixed layer is tamped to the preset compaction degree, and the energy dissipation and shock resistance of the backfill structure are improved.
Referring to fig. 2 and 3, fig. 2 is a flow chart of a construction method of a dense backfill structure on two sides of a pipeline according to the present invention, and fig. 3 is a schematic structural view of a construction device of a dense backfill structure on two sides of a pipeline according to the present invention.
The construction method of the dense backfill structure on two sides of the pipeline comprises the following steps:
step S1, determining the position of the pipeline trench according to the construction drawing, excavating the pipeline trench, and erecting backfill construction equipment 7 at two sides of the excavated pipeline trench;
step S2, when the erection is finished, the middle and coarse sand layer is backfilled to be used as a pipe base, and the middle and coarse sand layer after backfilling is tamped to the designed corresponding compaction degree by the small-sized tamping machine 8;
step S3, adjusting and placing the pipeline 5 to the upper part of the medium-coarse sand layer, and limiting and fixing the pipeline through a limiting device 9;
step S4, when the fixation is finished, the first rubble and aggregate chip mixing layer, the aggregate chip backfill layer, the second rubble and aggregate chip mixing layer and the common backfill soil layer are respectively backfilled layer by layer, and the small-sized tamping machine 8 is controlled to tamp layer by layer according to the designed compaction degree during backfilling construction;
when each backfill layer is constructed, the controller 10 determines the tamping times Ci of the backfill layer by a first tamping height G1 according to the designed compaction degree U0, tamps the backfill layer by the determined first tamping height G1 and the determined tamping times Ci, acquires the detection result of the actual compaction degree U of the backfill layer by a compaction degree detector (not shown in the figure) when tamping is completed, and if U is less than U0, the controller acquires the tamping layer descending amount H of the compact layer three times after the tamping times Ci detected by the laser range finder 11, compares the tamping layer descending amount H with the preset tamping layer descending amount H0, if H is less than H0, the controller judges that the tamping force of the small-sized tamper is insufficient, if H is greater than H0, the controller judges that the tamping times of the small-sized tamper are insufficient, and if U is greater than or equal to U0, the controller judges that the tamping times of the small-sized tamper are insufficient;
when the controller judges that the tamping force of the small-sized tamper is unqualified, the controller controls and adjusts the tamping height of the small-sized tamper, and when the controller judges that the tamping times of the small-sized tamper are insufficient, the controller controls and adjusts the tamping times of the small-sized tamper;
when the controller controls to tamp the backfill layer by adjusting the tamping height or the tamping times, the controller obtains the rebound amount of the hammer head 12 of the small-sized tamper, further judges whether the tamping force of the small-sized tamper is qualified or not according to the comparison result of the rebound amount and the preset rebound amount, and corrects the tamping height when the tamping force is unqualified.
Specifically, when each backfill layer is constructed, the actual compaction degree is controlled and detected, the actual compaction degree is compared with the designed compaction degree, whether the tamping force of the small-sized tamping machine is qualified or not is determined according to the comparison result, and when the tamping force is judged to be unqualified, the tamping height of the small-sized tamping machine and the tamping times of the backfill layers are automatically adjusted through the control of the controller, so that the automatic control of the small-sized tamping machine is improved, and the construction efficiency of pipeline construction is further improved.
Particularly, the tamping times of the small-sized tamper to the backfill layer are determined according to the comparison result of the designed compaction degree and the preset compaction degree, when the backfill layer is tamped by determining the tamping height and the tamping times, the judgment is further carried out according to the comparison result of the actual compaction degree and the designed compaction degree, and when the judgment is unqualified, the tamping height or the tamping times are determined to be adjusted according to the descending amount of the backfill layer, so that the control precision of the small-sized tamper is further improved, and the construction efficiency of the pipeline is further improved.
Particularly, when the tamping height or the tamping times are adjusted and the tamping process is carried out according to the corresponding tamping height or the corresponding tamping times, the control precision of the small-sized tamper is further improved by detecting the rebound quantity of the hammer head and judging whether the tamping height is corrected or not according to the comparison result of the rebound quantity of the hammer head and the preset rebound quantity, and therefore the construction efficiency of the pipeline is further improved.
In the embodiment of the invention, a method for simultaneously constructing two sides of a pipeline is adopted, a group of tamping mechanisms are respectively arranged on the two sides, and the pipeline is limited and fixed by a limiting device, so that the stability of pipeline construction is improved, and the pipeline deviation in the construction process is effectively prevented.
When the tamping times of the backfill layer are determined according to the preset compaction degree, the controller selects the corresponding tamping times according to the comparison result of the designed compaction degree U0 and the preset compaction degree and controls the small-sized tamper to tamp the backfill layer,
the controller is provided with a first preset compaction degree U1, a second preset compaction degree U2, a third preset compaction degree U3, a first tamping frequency C1, a second tamping frequency C2 and a third tamping frequency C3, wherein U1 is more than U2 and more than U3, C1 is more than C2 and more than C3,
when U1 is not less than U0 and is more than U2, the controller sets the tamping times of the small-sized tamper to the backfill layer as first tamping times C1;
when U2 is not less than U0 and is more than U3, the controller sets the tamping times of the small-sized tamper to the backfill layer as second tamping times C2;
when the U0 is more than or equal to U3, the controller sets the tamping times of the small-sized tamper to the backfill layer to be a third tamping time C3.
Particularly, the preset compaction degree and the tamping times are set in the controller, and the corresponding tamping times are selected according to the comparison result of the designed compaction degree and the preset compaction degree, so that the control precision of the small-sized tamper is further improved, and the efficiency of pipeline construction is further improved.
Specifically, when the controller determines that the tamping times are finished, the small-sized tamper is controlled to tamp the backfill layer, when tamping is finished, a detection result of a compaction degree detector on the actual compaction degree U of the backfill layer is obtained, if U is less than U0, the controller obtains the descent amount H of the backfill layer, which is tamped three times after the tamping times Ci detected by a laser range finder, sets i to be 1, 2 and 3, compares the descent amount H of the backfill layer with the preset descent amount H0, if H is less than H0, the controller determines that the tamping force of the small-sized tamper is insufficient, if H is more than H0, the controller determines that the tamping times of the small-sized tamper are insufficient, and if U is more than or equal to U0, the controller determines that tamping is finished.
Specifically, when H is less than H0, the controller calculates a first descending amount difference value Delta Ha between the backfill layer descending amount H and a preset backfill layer descending amount H0, sets Delta Ha to be H0-H, selects a corresponding height adjusting amount according to a comparison result of the first descending amount difference value and the preset descending amount difference value to adjust the first ramming height,
the controller is provided with a first preset descending amount difference value delta H1, a second preset descending amount difference value delta H2, a third preset descending amount difference value delta H3, a first height adjusting amount delta G1, a second height adjusting amount delta G2 and a third height adjusting amount delta G3, wherein delta H1 is more than delta H2 is more than delta H3, delta G1 is more than delta G2 is more than delta G3,
when the delta H1 is not less than delta Ha and is less than delta H2, the controller selects a first height adjusting quantity delta G1 to adjust the first ramming height;
when the delta H2 is not less than delta Ha and is less than delta H3, the controller selects a second height adjusting quantity delta G2 to adjust the first ramming height;
when the delta Ha is larger than or equal to the delta H3, the controller selects a third height adjusting quantity delta G3 to adjust the first ramming height;
when the controller selects the jth height adjustment amount, and when the first tamping height is adjusted by delta Gj, j is set to be 1, 2 and 3, the controller sets the adjusted tamping height to be the second tamping height G2, and G2 is set to be G1+ delta Gj.
Specifically, when H is greater than H0, the controller calculates a second descending amount difference value Delta Hb between the backfill layer descending amount H and a second preset backfill layer descending amount H2, sets Delta Hb to be H-H2, selects a tamping time adjusting coefficient according to a comparison result of the second descending amount difference value and a preset descending amount difference value to adjust the tamping time,
the controller is also provided with a first tamping frequency adjusting coefficient K1, a second tamping frequency adjusting coefficient K2 and a third tamping frequency adjusting coefficient K3, wherein 1 is more than K1 and more than K2 and more than K3 is less than 2,
when the delta H1 is not less than or equal to the delta Hb which is less than the delta H2, the controller selects a first tamping time adjusting coefficient K1 to adjust the tamping times;
when the delta H2 is not more than or equal to the delta Hb which is less than the delta H3, the controller selects a second tamping time adjusting coefficient K2 to adjust the tamping times;
when the delta Hb is larger than or equal to the delta H3, the controller selects a third tamping time adjusting coefficient K3 to adjust the tamping times;
when the controller selects the nth tamping frequency adjusting coefficient Kn for adjustment, setting n to be 1, 2 and 3, setting the adjusted tamping frequency to be C', setting C to be Ci multiplied by Kn, and setting i to be 1, 2 and 3.
Specifically, a preset descending amount difference value, a height adjusting amount and a tamping frequency adjusting coefficient are set in the controller, when U is less than U0 and the controller judges that the tamping height or the tamping frequency is adjusted according to the comparison result of the actual descending amount of the backfill layer and the preset descending amount of the backfill layer, the controller calculates the descending amount difference value of the actual descending amount of the backfill layer and the preset descending amount of the backfill layer and selects a corresponding height adjusting amount or a corresponding tamping frequency adjusting coefficient according to the comparison result of the descending amount difference value and the preset descending amount difference value to adjust the tamping height or the tamping frequency of the small-sized tamper, so that the control precision of the small-sized tamper is further improved, and the construction efficiency of the pipeline is further improved.
According to the construction method of the dense backfill structure on the two sides of the pipeline, when the controller controls the small-sized tamper to tamp the backfill layer by the adjusted tamping height or the tamping times, the controller obtains the rebound quantity D of the hammer head of the tamper and compares the rebound quantity D with the preset rebound quantity D0, if D is smaller than D0, the controller judges that the tamping force of the small-sized tamper is still insufficient, and if D is larger than or equal to D0, the controller judges that the tamping force of the small-sized tamper is qualified and controls the small-sized tamper to tamp the backfill layer by the adjusted tamping height or the welding times.
Specifically, when D is less than D0, the controller calculates the rebound quantity difference Delta D between the rebound quantity D and a preset rebound quantity D0, sets Delta D to D0-D, selects a corresponding height correction coefficient according to the comparison result of the rebound quantity difference and the preset rebound quantity difference to correct the ramming height,
the controller is also provided with a first preset springback difference value delta D1, a second preset springback difference value delta D2, a third preset springback difference value delta D3, a first height correction coefficient R1, a second height correction coefficient R2 and a third height correction coefficient R3, wherein delta D1 is more than delta D2 is more than delta D3, 1 is more than R1 is more than R2 is more than R3 is more than 2,
when the delta D1 is not less than the delta D < delta D2, the controller selects a first height correction coefficient R1 to correct the tamping height;
when the delta D2 is not more than delta D and is less than delta D3, the controller selects a second height correction coefficient R2 to correct the tamping height;
when the delta D is larger than or equal to the delta D3, the controller selects a third height correction coefficient R3 to correct the ramming height;
when the controller selects the jth 'height correction coefficient Rj' to correct the tamping height, setting j 'to be 1, 2 and 3, and setting the corrected tamping height to be a third tamping height G3 and G3 to be G2 multiplied by Rj'.
Specifically, through setting up at the controller and presetting resilience volume, presetting resilience volume difference and high correction coefficient to when control small-size rammer compactor with the height of ramming after the regulation or when ramming the number of times and ramming the back-filling layer, whether the comparison result of the resilience volume of actual tup and presetting resilience volume judges the ramming of small-size rammer compactor is not enough, and when judging inadequately, calculate the difference of resilience volume and presetting resilience volume, and select corresponding adjustment coefficient according to the comparison result of this difference and presetting resilience volume difference and revise the height of ramming, further improved the control accuracy to small-size rammer compactor, thereby further improved the efficiency of construction of pipeline.
The construction method of the dense backfill structure on two sides of the pipeline comprises the steps that when the controller controls the small-sized ramming machine to tamp the backfill layer by the adjusted ramming times or the corrected ramming height, and U is less than U0, the controller calculates the compaction degree difference delta U between the actual compaction degree U and the designed compaction degree U0, sets delta U to be U0-U, selects the corresponding adjustment quantity correction coefficient according to the comparison result of the compaction degree difference and the preset compaction degree difference to correct the height adjustment quantity,
the control module is also provided with a first preset compaction difference value delta U1, a second preset compaction difference value delta U2, a third preset compaction difference value delta U3, a first regulating quantity correction coefficient X1, a second regulating quantity correction coefficient X2 and a third regulating quantity correction coefficient X3, wherein delta U1 is more than delta U2 is more than delta U3, 1 is more than X1 is more than X2 is more than X3 is less than 1.5,
when the delta U1 is not less than the delta U which is less than the delta U2, the controller selects a first adjustment quantity correction coefficient X1 to correct the height adjustment quantity;
when the delta U2 is not less than the delta U which is less than the delta U3, the controller selects a second adjustment quantity correction coefficient X2 to correct the height adjustment quantity;
when the delta U is larger than or equal to the delta U3, the controller selects a third regulating variable correction coefficient X3 to correct the height regulating variable;
when the controller selects the s adjustment quantity correction coefficient Xs to correct the height adjustment quantity, s is set to be 1, 2 and 3, the controller sets the corrected height adjustment quantity to be delta G ', and delta G' is set to be delta Ge multiplied by Xs, wherein delta Ge is the e-th height adjustment quantity, and e is set to be 1, 2 and 3.
Specifically, a preset compaction degree difference value and an adjustment quantity correction coefficient are set in the controller, when the tamping on the backfill layer is completed according to the adjusted tamping times or the corrected tamping height, the controller judges that the actual compaction degree is lower than the design compaction degree, the controller calculates the compaction degree difference value between the actual compaction degree and the design compaction degree, and selects a corresponding correction coefficient according to the comparison result of the compaction degree difference value and the preset compaction degree difference value to correct the height adjustment quantity, so that the control precision of the small-sized tamper is further improved, and the construction efficiency of the pipeline is further improved.
In the construction method of the dense backfill structure at two sides of the pipeline, the controller is also provided with a maximum tamping height Gmax, when the controller sets the tamping height as a third tamping height G3, the controller compares the third tamping height G3 with the maximum tamping height Gmax, if G3 is more than or equal to Gmax, the controller judges that the tamping height is higher and the small-sized tamper cannot work, the controller calculates the height difference delta G between the third tamping height G3 and the maximum tamping height Gmax, sets the delta G as G3-Gmax, and selects a corresponding tamping frequency correction coefficient according to the comparison result of the difference and a preset height difference to correct the tamping frequency,
the controller is also provided with a first preset height difference delta G1, a second preset height difference delta G2, a third preset height difference delta G3, a first tamping frequency correction coefficient Q1, a second tamping frequency correction coefficient Q2 and a third tamping frequency correction coefficient Q3, wherein delta G1 is more than delta G2 and less than delta G3, 1 is more than Q1 and more than Q2 and more than Q3 and less than 1.5,
when the delta G1 is not less than the delta G which is less than the delta G2, the controller selects a first tamping frequency correction coefficient Q1 to correct the tamping frequency;
when the delta G2 is not more than delta G and is less than delta G3, the controller selects a second tamping frequency correction coefficient Q2 to correct the tamping frequency;
when the delta G is larger than or equal to the delta G3, the controller selects a third tamping frequency correction coefficient Q3 to correct the tamping frequency;
when the controller selects the n ' th number of times of tamping correction coefficient Qn ' to correct the number of times of tamping, setting n to 1, 2, 3, the controller sets the number of times of tamping after correction to C ', and sets C to C ' × Qn '.
Specifically, the maximum tamping height is set in the controller, and when the tamping height after correction exceeds the maximum tamping height, the tamping times are corrected, so that the control precision of the small-sized tamper is further improved, and the construction efficiency of the pipeline is further improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a construction method of dense backfill structure in pipeline both sides, this construction method includes the backfill structure that comprises well coarse sand layer, first rubber stone bits mixed layer, stone bits backfill layer, second rubber stone bits mixed layer and ordinary backfill soil layer, its characterized in that includes:
step S1, determining the position of a pipeline trench according to a construction drawing, excavating the pipeline trench, and erecting backfill construction equipment on two sides of the pipeline trench after the excavation is finished;
step S2, when the erection is finished, the middle coarse sand layer is backfilled to be used as a pipe base, and the middle coarse sand layer after backfilling is tamped to the designed corresponding compaction degree through a small-sized tamping machine;
step S3, adjusting and placing the pipeline to the upper part of the medium-coarse sand layer, and limiting and fixing the pipeline through a limiting device;
step S4, when the fixation is finished, the first rubble and stone chip mixing layer, the stone chip backfill layer, the second rubble and stone chip mixing layer and the common backfill soil layer are backfilled layer by layer, and the small-sized tamper is controlled to tamp layer by layer according to the designed compaction degree during backfilling construction;
when each backfill layer is constructed, the controller determines the tamping times Ci of the backfill layer by a first tamping height G1 according to the designed compaction degree U0, tamps the backfill layer by the determined first tamping height G1 and tamping times Ci, acquires the detection result of the actual compaction degree U of the backfill layer by a compaction degree detector when tamping is completed, acquires the backfill layer descending amount H of three times of tamping after the tamping times Ci detected by a laser level instrument if U is less than U0, compares the backfill layer descending amount H with the preset backfill layer descending amount H0 respectively, determines that the tamping force of the small-sized tamper is insufficient if H is less than H0, determines that the tamping times of the small-sized tamper are insufficient if H is more than H0, and determines that the tamping is completed if U0;
when the controller judges that the tamping force of the small-sized tamper is unqualified, the controller controls and adjusts the tamping height of the small-sized tamper, and when the controller judges that the tamping times of the small-sized tamper are insufficient, the controller controls and adjusts the tamping times of the small-sized tamper;
when the controller controls to tamp the backfill layer by adjusting the tamping height or the tamping times, the controller obtains the rebound amount of the hammer head of the small-sized tamper, further judges whether the tamping force of the small-sized tamper is qualified or not according to the comparison result of the rebound amount and the preset rebound amount, and corrects the tamping height when the tamping force is unqualified.
2. The method as claimed in claim 1, wherein when the number of times of tamping the backfill layer is determined according to a preset degree of compaction, the controller selects a corresponding number of times of tamping according to a comparison result of the designed degree of compaction U0 and a preset degree of compaction and controls the small-sized tamping machine to tamp the backfill layer,
the controller is provided with a first preset compaction degree U1, a second preset compaction degree U2, a third preset compaction degree U3, a first tamping frequency C1, a second tamping frequency C2 and a third tamping frequency C3, wherein U1 is more than U2 and more than U3, C1 is more than C2 and more than C3,
when U1 is not less than U0 and is more than U2, the controller sets the tamping times of the small-sized tamper to the backfill layer as first tamping times C1;
when U2 is not less than U0 and is more than U3, the controller sets the tamping times of the small-sized tamper to the backfill layer as second tamping times C2;
when the U0 is more than or equal to U3, the controller sets the tamping times of the small-sized tamper to the backfill layer to be a third tamping time C3.
3. The construction method of the pipeline two-side dense backfill structure according to claim 2, characterized in that when the controller determines that the tamping times are completed, the small-sized tamper is controlled to tamp the backfill layer, when the tamping is completed, a detection result of a compaction degree detector on an actual compaction degree U of the backfill layer is obtained, if U is less than U0, the controller obtains a descent amount H of the backfill layer, which is tamped three times after the tamping times Ci detected by the laser level, sets i to 1, 2, and 3, and compares the descent amount H of the backfill layer with a preset backfill layer amount H0, if H is less than H0, the controller determines that the tamping times of the small-sized tamper are insufficient, if H is greater than H0, the controller determines that the tamping times of the small-sized tamper are insufficient, and if U is greater than or equal to U0, the controller determines that the tamping times are completed.
4. The construction method of a dense backfill structure on two sides of a pipeline according to claim 3, characterized in that when H is less than H0, the controller calculates a first descending amount difference Δ Ha between the descending amount H of the backfill layer and a preset descending amount H0, sets Δ Ha as H0-H, selects a corresponding height adjustment amount according to a comparison result of the first descending amount difference and the preset descending amount difference to adjust the first tamping height, sets the adjusted tamping height as a second tamping height G2, sets G2 as G1+ Δ Gj, and the Δ Gj is a jth height adjustment amount.
5. The construction method of the dense backfill structure at two sides of the pipeline according to claim 4, characterized in that when H > H0, the controller calculates a second descending amount difference Δ Hb between the backfill layer descending amount H and a second preset backfill layer descending amount H2, sets Δ Hb as H-H2, selects a tamping time adjusting coefficient according to a comparison result of the second descending amount difference and the preset descending amount difference to adjust the tamping time, sets the adjusted tamping time as C ', sets C' as Ci x Kn, sets i as 1, 2, 3, and is the nth tamping time adjusting coefficient.
6. The construction method of the dense backfill structure on two sides of the pipeline according to claim 5, characterized in that when the controller controls the small-sized tamper to tamp the backfill layer with the adjusted tamping height or tamping times, the controller obtains the rebound quantity D of the hammer head of the tamper and compares the rebound quantity D with a preset rebound quantity D0, if D is less than D0, the controller judges that the tamping force of the small-sized tamper is still insufficient, if D is more than or equal to D0, the controller judges that the tamping force of the small-sized tamper is qualified, and controls the small-sized tamper to tamp the backfill layer with the adjusted tamping height or tamping times.
7. The method for constructing a dense backfill structure on two sides of a pipeline according to claim 6, wherein when D is less than D0, the controller calculates a difference Δ D between the rebound D and a preset rebound D0, sets Δ D to D0-D, and selects a corresponding height correction coefficient according to a comparison result between the difference D and the preset rebound to correct the tamping height, the controller sets the corrected tamping height to a third tamping height G3, sets G3 to G2 × Rj ', wherein Rj ' is the j ' th height correction coefficient.
8. The method of claim 7, wherein when the controller controls the small-sized rammer to tamp the backfill layer by the adjusted number of times of ramming or the modified ramming height, and U is less than U0, the controller calculates a difference Δ U between the actual compaction degree U and a designed compaction degree U0, sets Δ U to U0-U, and selects a corresponding adjustment correction coefficient to modify the height adjustment amount according to a comparison result of the difference between the compaction degree and a preset compaction degree, and the controller sets the modified height adjustment amount to Δ G 'and sets Δ G' to Δ Ge × Xs, where Δ Ge is the e-th height adjustment amount, Xs is the s-th adjustment correction coefficient, and e is 1, 2, 3.
9. The method for constructing a compact backfill structure on two sides of a pipeline according to claim 8, characterized in that a maximum ramming height Gmax is further provided in the controller, when the controller sets the tamping height to be the third tamping height G3, the controller compares the third tamping height G3 with the maximum tamping height Gmax, if G3 is more than or equal to Gmax, the controller judges that the tamping height is high and the small-sized tamper cannot work, calculates the height difference deltaG between the third tamping height G3 and the maximum tamping height Gmax, sets the deltaG to be G3-Gmax, and selects the corresponding correction coefficient of the tamping times according to the comparison result of the difference and the preset height difference to correct the tamping times, the controller sets the number of times of tamping after correction to C ", sets C" ═ C' x Qn ", Qn" to the nth number of times of tamping correction coefficient.
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| CN110439082B (en) * | 2019-07-10 | 2024-03-19 | 江苏大学 | Backfill structure suitable for vibration isolation of underground pipeline and construction method |
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| CN110906058B (en) * | 2019-11-28 | 2021-05-18 | 中国电建集团河南工程有限公司 | Construction method of thermosetting resin pipeline in desert soil |
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