CN113585275A - Construction method for protecting horizontal branch pipe of thermal spring well in foundation pit - Google Patents
Construction method for protecting horizontal branch pipe of thermal spring well in foundation pit Download PDFInfo
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- CN113585275A CN113585275A CN202010363349.7A CN202010363349A CN113585275A CN 113585275 A CN113585275 A CN 113585275A CN 202010363349 A CN202010363349 A CN 202010363349A CN 113585275 A CN113585275 A CN 113585275A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
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Abstract
The invention relates to a construction method for protecting horizontal branch pipes of a thermal spring well in a foundation pit, which comprises the following steps: 1) excavating soil on the upper part of the horizontal branch pipe of the hot spring well; 2) excavating two shockproof ditches 2-3m away from the two sides of the horizontal branch pipe of the hot spring well; 3) temporarily dismantling the horizontal branch pipes of the hot spring well, and sinking a plurality of H-shaped steel support frames into the foundation pit soil body at equal intervals; 4) excavating the soil around the horizontal branch pipe of the hot spring well for the first time; 5) welding a mounting plate on the upper part of the H-shaped steel support frame, and cutting a mounting opening on the H-shaped steel pipe gallery; 6) connecting the H-shaped steel pipe gallery to the H-shaped steel supporting frame; 7) carrying out geotextile layer coating operation on the outer side of the hot spring well horizontal branch pipe, and reassembling the hot spring well horizontal branch pipe in place; 8) constructing a steel structure support frame on the top beam; 9) and (5) excavating soil body in a layered and segmented manner. The invention can ensure that the horizontal branch pipe of the hot spring well can be normally used in the construction process.
Description
Technical Field
The invention relates to a construction method for protecting horizontal branch pipes of a thermal spring well in a foundation pit, which is mainly used for protecting the horizontal branch pipes of the thermal spring well in the construction process of a basement and ensuring that the horizontal branch pipes of the thermal spring well can normally carry out external transportation work in the construction process of the basement.
Background
At present, the urban development speed is accelerated, the scale of old city reconstruction is continuously enlarged, and the protection of hot spring resources in the construction process is particularly important. At present, the related technology and application of the aspect in the engineering construction process are almost blank. The protection of hot spring resources in the construction process mainly comprises two aspects, namely the protection of a vertical main pipe of a hot spring well in a foundation pit and the protection of a horizontal branch pipe of the hot spring well in the foundation pit. Because the protection technical measures of the thermal spring well are rare at home, the normal use of the thermal spring well in the construction process is a reference without related engineering cases.
The horizontal branch pipe of the thermal spring well needs to transversely penetrate to the outer wall of the basement from the inside of the foundation pit, when earthwork is excavated, the horizontal branch pipe of the thermal spring well is in a suspension state, the length of the suspension section is relatively long, and therefore the deformation of the horizontal branch pipe of the thermal spring well is easy to cause structural damage due to the fact that the deformation of the horizontal branch pipe of the thermal spring well exceeds a limit value under the self-weight effect of the horizontal branch pipe of the suspension section and the vertical line load effect of the thermal spring water conveying process. And the extrusion force of large-scale mechanical equipment to the soil body in the foundation pit construction process is very easily conducted to the hot spring well horizontal branch pipe, and the deformation probability and the deformation of the hot spring well horizontal branch pipe are further aggravated. In order to prevent the hot spring well horizontal branch pipe from being damaged in the construction process, most of the hot spring well horizontal branch pipes are directly dismantled in the existing foundation pit construction process, and the hot spring well horizontal branch pipe is restored to be installed and used after the foundation pit completely completes construction, so that the hot spring well horizontal branch pipe is difficult to effectively and normally use in the construction process.
Therefore, the research aims to develop the construction method which can effectively reduce the deformation of the suspended section of the horizontal branch pipe of the hot spring well and can effectively block the pressure stress conduction during the construction of large construction machinery, thereby effectively reducing the deformation probability and the deformation of the horizontal branch pipe of the hot spring well and ensuring that the horizontal branch pipe of the hot spring well can be normally used in a foundation pit in the construction process to protect the horizontal branch pipe of the hot spring well.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a construction method for protecting a horizontal branch pipe of a thermal spring well in a foundation pit, which can effectively reduce the deformation of a suspended section of the horizontal branch pipe of the thermal spring well and can effectively block the pressure stress conduction during the construction of large-scale construction machinery, thereby effectively reducing the deformation probability and the deformation of the horizontal branch pipe of the thermal spring well and enabling the horizontal branch pipe of the thermal spring well to be normally used in the construction process.
The technical scheme of the invention is that
A construction method for protecting horizontal branch pipes of a thermal spring well in a foundation pit comprises the following steps:
1) excavating soil on the upper part of the horizontal branch pipe of the thermal spring well by using a small excavator, stopping mechanical excavation until soil with the thickness of at least 30cm remains on the upper part of the horizontal branch pipe, and adopting manual excavation until the horizontal branch pipe of the thermal spring well is completely exposed;
2) excavating two shockproof ditches 2-3m away from the two sides of the horizontal branch pipe of the hot spring well, wherein the width of each shockproof ditch is 50-100cm, and the depth of each shockproof ditch is not less than 1 m;
3) temporarily dismantling horizontal branch pipes of the hot spring well, sinking a plurality of H-shaped steel support frames into the foundation pit soil body at equal intervals by adopting hydraulic equipment, controlling the sinking depth of the H-shaped steel support frames, and ensuring that the suspended section of each H-shaped steel support frame is smaller than 2/3 of the buried section after the foundation pit soil body is excavated;
4) excavating the soil around the horizontal branch pipe of the hot spring well for the first time, wherein the depth of the first excavation is 500mm below the elevation of the top plate;
5) connecting an H-shaped steel pipe gallery at the top of an H-shaped steel support frame, welding a mounting plate on the upper part of the H-shaped steel support frame before connection, forming a two-stage step shape on the upper part of the mounting plate, arranging a corresponding clamping convex edge, and cutting a mounting opening on the H-shaped steel pipe gallery;
6) connecting an H-shaped steel pipe gallery to an H-shaped steel supporting frame, wherein mounting plates on the H-shaped steel supporting frame are respectively supported at the lower part of the H-shaped steel pipe gallery, clamping convex edges on the mounting plates are respectively clamped in corresponding mounting holes on the H-shaped steel pipe gallery, and fixedly connecting the clamping convex edges and the mounting holes of the H-shaped steel pipe gallery effectively in a groove welding mode;
7) carrying out geotechnical cloth layer coating operation on the outer side of the hot spring well horizontal branch pipe, then placing the hot spring well horizontal branch pipe on the H-shaped steel pipe gallery, and reassembling the hot spring well horizontal branch pipe in place;
8) in the construction process of the steps 3) -7), synchronously constructing a top beam at the edge of the foundation pit, constructing a steel structure support frame on the top beam after the construction of the top beam is finished, and welding the top of the steel structure support frame to the bottom of the H-shaped steel pipe gallery;
9) and excavating the soil body in a layered and segmented manner until the soil body is lowered to the elevation of the bottom of the basement bottom plate.
And step 9), welding a circle of water stop steel plate at the joint of the H-shaped steel support frame and the basement bottom plate, and performing bottom plate concrete pouring construction after the water stop steel plate is welded.
The H-shaped steel support frame in the step 3) adopts type steels of HM488 multiplied by 300 multiplied by 11 multiplied by 18.
The H-shaped steel pipe gallery in the step 5) adopts HN700 multiplied by 300 multiplied by 11 multiplied by 24 type steel.
The outer side of the hot spring well horizontal branch pipe in the step 7) is coated with at least two geotextile layers, and the geotextile layers are tightly tied to the outer side of the hot spring well horizontal branch pipe through iron wires.
The steel support frame in the step 8) is formed by mutually welding a plurality of angle steels of 36x36x 4.
THE ADVANTAGES OF THE PRESENT INVENTION
1) The H-shaped steel support frame and the steel support frame are used as support points to effectively form stable support for the H-shaped steel pipe gallery. H shaped steel piping lane's crushing resistance, bending resistance are good, and the type and H shaped steel piping lane's both sides flank edge can effectively block the extrusion stress of the soil body, then adopt H shaped steel support frame and steel structure support frame as the strong point, have effectively guaranteed H shaped steel piping lane's stability and rigidity. Through the setting of H shaped steel support frame, steel structure support frame and H shaped steel piping lane, make hot spring well horizontal branch pipe not be in unsettled state at the in-process of foundation ditch soil body excavation, effectively reduce the deflection of the unsettled section of hot spring well horizontal branch pipe.
2) Adopt H shaped steel piping lane admittedly can improve the support protection to hot spring well horizontal branch pipe, but the welding operation degree of difficulty between H shaped steel piping lane (bottom) and H shaped steel support frame (top) is very big, and not only the face of weld is in H shaped steel piping lane's bottom surface, and H shaped steel piping lane's both sides edge of a wing can cause for the welding and block, therefore the welding degree of difficulty is very big.
According to the invention, before the H-shaped steel pipe gallery is installed, the upper part of the H-shaped steel support frame is convenient to weld the installation plate, the upper part of the installation plate is provided with the corresponding clamping convex edge in a two-stage step shape, and meanwhile, the installation opening is cut on the H-shaped steel pipe gallery. During the installation, the mounting panel on the H shaped steel support frame supports respectively in H shaped steel piping lane's lower part, and the protruding edge of joint on the mounting panel joint respectively in the corresponding installing port on H shaped steel piping lane, through groove welding mode alright effectively in the protruding edge of joint and H shaped steel piping lane's installing port within a definite time form the rigid coupling. The clamping connection effect is increased on the basis of welding, the welding operation surface is transferred to the upper end surface of the H-shaped steel pipe gallery, and the welding operation process of the H-shaped steel support frame and the mounting plate is also in unimpeded welding, so that the welding operation difficulty can be greatly reduced while the connection effect of the H-shaped steel pipe gallery and the H-shaped steel support frame is greatly improved.
3) According to the invention, the geotechnical cloth layer coating operation is carried out on the outer side of the hot spring well horizontal branch pipe, then the hot spring well horizontal branch pipe is reassembled in place, the hot spring can be recovered for external transportation and use after the hot spring well horizontal branch pipe is reassembled in place, and the subsequent processes of soil body layered excavation, bottom plate construction and the like do not influence the normal use of the hot spring well horizontal branch pipe. The geotechnical cloth layer is adopted to coat the horizontal branch pipe of the thermal spring well, the surface integrity of the horizontal branch pipe of the thermal spring well can be effectively protected, and the geotechnical cloth layer can absorb partial water pressure of the thermal spring water when risky damage occurs, so that the safety of surrounding constructors is protected.
4) According to the invention, two shockproof ditches are dug at 2-3m positions outside two sides of the horizontal branch pipe of the hot spring well, and through the arrangement of the shockproof ditches, the pressure stress conduction during the construction of large construction machinery before and after the earthwork excavation can be effectively blocked, so that the deformation probability and the deformation amount of the horizontal branch pipe of the hot spring well are further reduced, and the normal use of the horizontal branch pipe of the hot spring well in the construction process is further ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention after completion of construction.
Fig. 2 is a partial cross-sectional view of the present invention.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings:
engineering site: the Fujian province, Fuzhou city, Zhengxiangli garden; and (3) construction project: three hot spring wells exist in the range of the basement; two of the three thermal spring wells are high-temperature wells, and one is a low-temperature well; the distance between the horizontal branch pipes of the hot spring well from the farthest end to the side crown beam of the foundation pit is 21 m.
Referring to fig. 1-2, the specific protection construction steps are as follows:
1) digging a soil body on the upper part of the horizontal branch pipe 1 of the hot spring well by using a small excavator, stopping mechanical digging until a soil body with the thickness of 30cm is remained on the upper part of the horizontal branch pipe 1, and manually digging until the horizontal branch pipe 1 of the hot spring well is completely exposed;
2) excavating two shockproof ditches 2.5m outside two sides of the horizontal branch pipe 1 of the hot spring well, wherein the width of each shockproof ditch is 80cm, and the depth of each shockproof ditch is 1.4 m;
3) temporarily dismantling the horizontal branch pipes 1 of the hot spring well, sinking a plurality of H-shaped steel support frames 4 into the foundation pit soil body at equal intervals by adopting hydraulic equipment, controlling the sinking depth of the H-shaped steel support frames 4, and ensuring that the suspended section of each H-shaped steel support frame 4 is smaller than 2/3 of the buried section after the foundation pit soil body is excavated;
4) excavating the soil around the horizontal branch pipe 1 of the hot spring well for the first time, wherein the depth of the first excavation is 500mm below the elevation of the top plate;
5) connecting an H-shaped steel pipe gallery 5 at the top of an H-shaped steel support frame 4, welding a mounting plate 6 on the upper part of the H-shaped steel support frame 4 before connection, arranging a corresponding clamping convex edge 7 on the upper part of the mounting plate 6 in a two-stage step shape, and cutting a mounting opening on the H-shaped steel pipe gallery 5;
6) connecting an H-shaped steel pipe gallery 5 to an H-shaped steel supporting frame 4, respectively supporting mounting plates 6 on the H-shaped steel supporting frame 4 at the lower part of the H-shaped steel pipe gallery 5, respectively clamping convex edges 7 on the mounting plates 6 in corresponding mounting holes on the H-shaped steel pipe gallery 5, and effectively forming fixed connection between the clamping convex edges 7 and the mounting holes of the H-shaped steel pipe gallery 5 in a groove welding mode;
7) performing geotechnical cloth layer 8 coating operation on the outer side of the hot spring well horizontal branch pipe 1, then placing the hot spring well horizontal branch pipe 1 on an H-shaped steel pipe gallery 5, and reassembling the hot spring well horizontal branch pipe 1 in place;
8) in the construction process of the steps 3) -7), synchronously performing construction 2 on the side crown beam of the foundation pit, after the construction of the crown beam 2 is completed, constructing a steel structure support frame 3 on the crown beam 2, and welding the top of the steel structure support frame 3 to the bottom of the H-shaped steel pipe gallery 5;
9) excavating soil in a layered and segmented manner until the soil is lowered to the elevation of the bottom of the basement bottom plate;
10) and a circle of water stop steel plate 9 is welded at the joint of the H-shaped steel support frame 4 and the basement bottom plate, and the bottom plate concrete 10 is poured after the water stop steel plate 9 is welded.
The H-shaped steel support frame 4 in the step 3) adopts type steel of HM488 multiplied by 300 multiplied by 11 multiplied by 18. The H-shaped steel pipe gallery 5 in the step 5) adopts HN700 multiplied by 300 multiplied by 11 multiplied by 24 type steel. The outer side of the hot spring well horizontal branch pipe 1 in the step 7) is coated with at least two geotextile layers 8, and the geotextile layers 8 are fastened to the outer side of the hot spring well horizontal branch pipe 1 through iron wires. The steel support frame 3 in the step 8) is formed by mutually welding a plurality of angle steels of 36x36x 4.
The horizontal branch pipe 1 of the hot spring well is protected and constructed according to the construction method, the horizontal branch pipe 1 of the hot spring well can be recovered to be output and used after being reassembled in place, the normal use of the horizontal branch pipe 1 of the hot spring well is not influenced in the subsequent processes of soil body layered excavation, bottom plate construction and the like, and the method can be popularized and applied in the related hot spring well protection engineering in the future.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A construction method for protecting horizontal branch pipes of a thermal spring well in a foundation pit is characterized by comprising the following steps:
1) excavating soil on the upper part of the horizontal branch pipe of the thermal spring well by using a small excavator, stopping mechanical excavation until soil with the thickness of at least 30cm remains on the upper part of the horizontal branch pipe, and adopting manual excavation until the horizontal branch pipe of the thermal spring well is completely exposed;
2) excavating two shockproof ditches 2-3m away from the two sides of the horizontal branch pipe of the hot spring well, wherein the width of each shockproof ditch is 50-100cm, and the depth of each shockproof ditch is not less than 1 m;
3) temporarily dismantling horizontal branch pipes of the hot spring well, sinking a plurality of H-shaped steel support frames into the foundation pit soil body at equal intervals by adopting hydraulic equipment, controlling the sinking depth of the H-shaped steel support frames, and ensuring that the suspended section of each H-shaped steel support frame is smaller than 2/3 of the buried section after the foundation pit soil body is excavated;
4) excavating the soil around the horizontal branch pipe of the hot spring well for the first time, wherein the depth of the first excavation is 500mm below the elevation of the top plate;
5) connecting an H-shaped steel pipe gallery at the top of an H-shaped steel support frame, welding a mounting plate on the upper part of the H-shaped steel support frame before connection, forming a two-stage step shape on the upper part of the mounting plate, arranging a corresponding clamping convex edge, and cutting a mounting opening on the H-shaped steel pipe gallery;
6) connecting an H-shaped steel pipe gallery to an H-shaped steel supporting frame, wherein mounting plates on the H-shaped steel supporting frame are respectively supported at the lower part of the H-shaped steel pipe gallery, clamping convex edges on the mounting plates are respectively clamped in corresponding mounting holes on the H-shaped steel pipe gallery, and fixedly connecting the clamping convex edges and the mounting holes of the H-shaped steel pipe gallery effectively in a groove welding mode;
7) carrying out geotechnical cloth layer coating operation on the outer side of the hot spring well horizontal branch pipe, then placing the hot spring well horizontal branch pipe on the H-shaped steel pipe gallery, and reassembling the hot spring well horizontal branch pipe in place;
8) in the construction process of the steps 3) -7), synchronously constructing a top beam at the edge of the foundation pit, constructing a steel structure support frame on the top beam after the construction of the top beam is finished, and welding the top of the steel structure support frame to the bottom of the H-shaped steel pipe gallery;
9) and excavating the soil body in a layered and segmented manner until the soil body is lowered to the elevation of the bottom of the basement bottom plate.
2. The construction method for protecting the horizontal branch pipe of the spring well in the foundation pit according to claim 1, characterized in that: and step 9), welding a circle of water stop steel plate at the joint of the H-shaped steel support frame and the basement bottom plate, and performing bottom plate concrete pouring construction after the water stop steel plate is welded.
3. The construction method for protecting the horizontal branch pipe of the spring well in the foundation pit according to claim 1, characterized in that: the H-shaped steel support frame in the step 3) adopts type steels of HM488 multiplied by 300 multiplied by 11 multiplied by 18.
4. The construction method for protecting the horizontal branch pipe of the spring well in the foundation pit according to claim 1, characterized in that: the H-shaped steel pipe gallery in the step 5) adopts HN700 multiplied by 300 multiplied by 11 multiplied by 24 type steel.
5. The construction method for protecting the horizontal branch pipe of the spring well in the foundation pit according to claim 1, characterized in that: the outer side of the hot spring well horizontal branch pipe in the step 7) is coated with at least two geotextile layers, and the geotextile layers are tightly tied to the outer side of the hot spring well horizontal branch pipe through iron wires.
6. The construction method for protecting the horizontal branch pipe of the spring well in the foundation pit according to claim 1, characterized in that: the steel support frame in the step 8) is formed by mutually welding a plurality of angle steels of 36x36x 4.
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