CN113846869A

CN113846869A - Large block segmentation, underpinning and translation protection technology for engineering site

Info

Publication number: CN113846869A
Application number: CN202111207746.6A
Authority: CN
Inventors: 吴二军; 陆建明; 高彬; 陆建华; 薛志飞
Original assignee: Nantong Juneng Construction Engineering Technology Co ltd
Current assignee: Nantong Juneng Construction Engineering Technology Co ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2021-12-28
Anticipated expiration: 2041-10-18
Also published as: CN113846869B

Abstract

The invention discloses a translation protection technology for large block segmentation underpinning of an engineering site. The technology comprises the working procedures of dam body partition enclosure construction, underpinning structure construction, traction counter-force support construction, translational power equipment installation, dam body unit translation and in-place connection. The dam body unit enclosure adopts a double-layer baffle and a winding rope structure. The underpinning structure consists of closely-arranged steel pipe lower slideways and a steel plate tray; the head and the tail of the steel plate tray are connected into a whole. The invention provides a technical scheme of large-block underpinning translation for protecting rammed earth cultural relic relics, can effectively realize more complete protection on the historical landscape, cultural relic value and ancient engineering technical information of rammed earth cultural relics, and has important bearing significance for solving the contradiction between social development planning and building relic protection by popularization and application.

Description

Large block segmentation, underpinning and translation protection technology for engineering site

Technical Field

The invention relates to a translation protection technology for large block segmentation underpinning of an engineering site, belonging to the technical field of integral translation of buildings.

Background

With the continuous acceleration of city construction in China, a large number of existing buildings need to be dismantled and rebuilt due to old city reconstruction, road planning, track construction and the like. However, due to the cultural relic protection requirement, many ancient sites cannot be dismantled and rebuilt according to the traditional mode, and only can be reserved in situ, which brings little obstruction to the development and utilization of urban space. In order to solve the contradiction between old city reconstruction, new city construction and historical ancient site protection, the concept of relocation protection adopted for ancient sites should be born.

Nowadays, China has many related engineering cases for site relocation protection, such as public bidding: shanghai Mazuo temple relocation protection engineering, Shanghai Guanglin culture site relocation protection engineering, Xuzhou Mingdian health site integral relocation engineering, and the like. The methods mostly adopted by the vestige protection projects are as follows: cutting the blocks, then wrapping, hoisting and transporting the blocks by using the glass fiber reinforced plastic and the flexible material, and finally assembling and restoring the blocks at a new site. The method has high cost and low efficiency, has high possibility of damaging historical information and cultural relic values, can not meet the requirements of the existing removal protection of numerous historical sites, and is particularly not suitable for the removal protection of large-sized rammed earth structures. Therefore, the ancient site is preferably moved and protected by adopting the related technical means of integral translation of the building.

The integral translation technology of the building refers to technology for integrally shifting the building from an original site to a proper position for protection and utilization under the condition of not influencing the use function of the building in order to meet the requirements of urban construction planning and the like. The whole translation technology of the building is mature, the maximum translation building area exceeds 2 ten thousand square meters, the weight reaches 3 ten thousand tons (xi bus station rotation translation project behind mansion door), and the maximum translation exceeds 15 floors (Tung office building translation in Shandong Laiwu development area). However, the prior art is not suitable for relocation protection of rammed earth relics which exist in China in large quantity. The technical difficulty lies in that underpinning and translation track set up the difficulty in the ground, and the underpinning structure of building translation is mostly superstructure underpinning or basic underpinning, and the track adopts the form of bar basis or sleeper rail more, and these techniques all need carry out large tracts of land excavation to the building basis, are difficult to implement inside the soil body.

In the protection of some cultural buildings, the jacking pipe underpinning technology in the foundation is also adopted in part of projects, but the jacking pipe underpinning technology is only used for jacking projects (such as the jacking protection projects of palace buildings in Wudangshan mountains). The lower rail is not needed to be arranged in the jacking engineering, only the jacking counter-force platform with enough bearing capacity is needed to be arranged, and the method is easily realized by applying a pile foundation or an independent column foundation. But the construction of the low-cost underpinning and track double structure in the soil body has great technical difficulty. Meanwhile, a counter-force platform in the jacking engineering does not need to be moved, and when the site area is large and translation is needed for a long distance, a large amount of cost can be generated by arranging the full-length track.

In conclusion, in the current research on the integral translation technology of the building, a large research space and potential application value are provided for the relevant technology of ancient site translation protection. In order to solve the conflict between social development planning and effective protection of the building site, a underpinning translation protection technology suitable for the rammed earth ancient site is developed based on the whole translation technology of the building so as to protect the historical landscape, cultural relic value and ancient engineering technical information of the rammed earth ancient site more completely, and the method has important historical culture inheritance significance undoubtedly.

Disclosure of Invention

The invention aims to solve the technical problem of researching and developing a underpinning translation technology suitable for large blocks of engineering sites on the basis of the conventional integral translation technology of buildings and based on related engineering cases of ancient dam translation so as to protect the historical landscape, cultural relic value and ancient engineering technical information of rammed earth type building sites.

The basic idea of the invention is as follows: firstly, constructing a counterforce device and installing a horizontal power device at a preset position; then, carrying out partition enclosing construction on the ancient site, and arranging a horizontal underpinning structure; starting a horizontal power device, and alternately drawing a steel plate and a steel pipe lower slideway to enable the ancient site unit to move horizontally to a target position; finally, completing the in-situ connection with the new foundation at the target position.

The invention adopts the specific technical scheme that:

a translation protection technique for large block partition of engineering site. The method is characterized by comprising the working procedures of traction counter-force support construction, ancient site body segmentation and enclosure construction, underpinning structure arrangement and installation, translation power equipment installation, ancient site body unit translation, in-place connection and the like. The dam body unit enclosing structure is constructed from the side surface of the dam body soil body from inside to outside: the inner baffle, the inner winding rope, the high-through outer baffle (or keel) arranged at intervals and the outer winding rope. The underpinning structure consists of closely-arranged steel pipe lower slideways and a steel plate tray; a traction ring is arranged in front of each steel pipe; the steel plate tray consists of a group of strip steel plates, tail connecting angle steel and a head steel connecting piece, wherein the strip steel plates are long along the moving direction; the bottom steel plate and the strip-shaped steel plate of the head connecting piece are provided with traction cable holes with coincident positions, the diameter of each cable hole is about 40mm, and the traction cable holes are usually arranged in a gap between two steel pipes. The traction counter-force support consists of a steel pipe pile driven into a foundation, a post-prestressed anchor rod, a connecting Hualan screw and a horizontal counter-force beam, wherein a steel cable hole is reserved in the counter-force steel beam.

The construction sequence of the project of the invention is as follows: firstly, constructing a counterforce device at a preset position, and installing a horizontal power device; then carrying out horizontal underpinning structure and ancient site body segmentation enclosure construction (the sequence of the two construction items can be exchanged, but the two construction items are not constructed at the same time); then starting a horizontal power device to finish the translation of the ancient site body unit; finally, the in-place connection is completed at the target position.

The construction sequence of the traction counterforce device is as follows: firstly, pressing a steel pipe pile into a set position, wherein the steel pipe pile is required to extend out of the ground to a certain height; then a certain distance away from one side of the dam is driven into a reinforced concrete prestressed anchor rod, and the end part of the anchor rod is preferably just extended out of the ground; then, connecting the steel pipe pile with the upper end of the anchor rod by using the turn buckle and the steel cable, and rotating the turn buckle to tighten the steel cable; then, a reaction beam is arranged at the position close to the steel pipe pile, and a steel cable hole is reserved in the reaction beam along the translation direction for a traction steel cable to pass through; and finally, a translational power device (a jack or a plate rolling machine) is arranged on the counter-force beam.

The construction sequence of the underpinning structure is as follows: firstly, horizontally jacking densely-arranged steel pipes at the bottom of a translation dam body to serve as a lower slideway, wherein the diameter of the steel pipes is about 800mm, the length of the steel pipes is twice of the width of an ancient site body, the distance between the two steel pipes is about 1 m, when pipe jacking is difficult, soil guide holes can be dug through a horizontal spiral drill, steel cables penetrate through the guide holes, the front end of the guide holes is connected to power equipment, the rear end of the guide holes is connected with a traction ring at the front end of the steel pipes, and the guide holes are pulled to be in place by the power equipment; then, strip-shaped steel plates are driven into the steel pipe along the steel pipe upper skin as a platform at intervals, the length of each strip-shaped steel plate is about 2 meters longer than the ancient site body, the front end and the rear end of each strip-shaped steel plate extend out of the underpinned ancient site body unit, the width of each strip-shaped steel plate is preferably just over 2 to 3 steel pipes, and when the strip-shaped steel plates are difficult to drive, a concrete wire cutting saw can be adopted to cut horizontal seams in soil bodies close to the upper parts of the steel pipes; and finally, the head connecting piece, the tail connecting angle steel and the steel plate are connected into a whole through bolts.

The construction sequence of ancient ruins unit enclosure is as follows: firstly, determining the length of each section of ancient site body unit according to actual requirements, and generally controlling the length to be within the range of 5-10 meters; selecting a segmentation excavation working surface, designing a segmentation slit part between two sections of ancient site body units to form an inverted splayed slope, controlling the length of the top excavation working surface to be about 3.5 meters generally, and gradually reducing an excavation section along with the increase of excavation depth, but ensuring that the distance between two underpinning units is not less than 2.5 meters when the ancient site is excavated to the bottom; then, carrying out layered excavation, installing an inner baffle along the periphery of each layer of excavation, and firmly winding the inner baffle from the periphery by using an inner winding rope, wherein the height of each layer is about 1 m; when the dam is excavated to the bottom of the dam, the inner baffle and the inner winding rope are completely finished, the high-through outer baffles (or keels) are installed on four sides at intervals, and the outer winding rope is used for winding firmly.

The construction sequence of ancient site body unit translation is as follows: firstly, one end of a traction steel cable penetrates through a counter-force beam and is connected to power equipment, and the other end of the traction steel cable is connected to a reserved index hole in the front end of a steel plate tray through a hook; then starting power equipment to enable the steel plate tray and the upper ancient site body unit to integrally translate; after reaching a translation stroke, unhooking the steel cable hook from the front of the steel plate tray, hanging the steel cable hook on a traction ring at the front end of the steel pipe, and translating the steel pipe lower slideway forward by a stroke one by one at intervals; after all the steel pipe lower runners move forwards, unhooking, secondarily connecting the unhooking to the front end of the steel plate tray, and starting the second stroke translation; and repeating the translation stroke until the dam body reaches the designated target position, and finishing the translation operation.

Drawings

FIG. 1 is a general perspective view of a underpin translation device

FIG. 2 is a sectional elevation view of ancient site

FIG. 3 is a plan view of the ancient site unit division

FIG. 4 is a side elevation view of the ancient site unit partition

FIG. 5 is a perspective view of an inner wrap wire rope and an inner dam

FIG. 6 is a perspective view of an outer wrap cable and outer fenders

FIG. 7 is a front elevation view of the underpinning structure

FIG. 8 is a perspective view of a underpinning structure

FIG. 9 is a detail view of the steel connecting piece at the front end of the steel plate tray

FIG. 10 is a detail view of the angle steel at the rear end of the steel plate pallet

FIG. 11 is a partial plan view of a steel pallet

FIG. 12 is an elevation view of a horizontal power unit and a reaction force support

In the above figure: 1-ancient site body; 2-an inner baffle; 3-internally winding a steel cable; 4-an outer baffle; 5-externally winding a steel cable; 6-steel tube lower slideway; 7-angle steel; 8-channel steel; 9-a traction wire rope; 10-steel pipe pile; 11-a threaded nail; 12-index hole; 13-bottom strip steel plate; 14-reaction beam; 15-a center-penetrating jack; 16-prestressed anchor rods; 17-turnbuckle; 18-counterforce device wire rope; 19-steel pipe traction ring

Detailed Description

The invention is further described below with reference to the accompanying drawings, which are only used to more clearly illustrate the technical solutions of the invention.

The specific operation of the invention in application comprises six stages: the method comprises the following steps of traction counter-force support construction, traction power equipment installation, ancient site body segmentation and enclosure construction, underpinning structure arrangement and installation, ancient site body unit translation and in-place connection.

The construction process of the traction reaction force support comprises the following steps:

1) and pressing the steel pipe pile into a set position, wherein the diameter of the steel pipe pile is about 800m, and the steel pipe pile is required to extend out of the ground to a certain height.

2) And (3) driving a reinforced concrete prestressed anchor rod into the steel pipe pile at a certain distance away from one side of the dam, wherein the end part of the anchor rod is preferably just extended out of the ground.

3) And the steel pipe pile is connected with the upper end of the anchor rod by using the turn buckle and the steel cable, and the turn buckle is used for tensioning the steel cable.

4) And a reaction beam is arranged at the position close to the steel pipe pile, and a steel cable hole is reserved in the reaction beam along the translation direction for a traction steel cable to pass through.

The installation process of the traction power equipment comprises the following steps:

1) and traction power equipment (a jack or a plate rolling machine) is arranged on the counter-force beam according to the reserved steel cable hole.

2) And (4) passing the traction steel cable through the steel cable hole to be connected with traction power equipment.

The ancient site body segmentation and enclosure construction process comprises the following steps:

1) and determining the length of each section of underpinning unit body and the number of underpinning unit bodies according to actual requirements, and determining the position of an excavation working face. The length of each underpinning unit is usually controlled within the range of 5 to 10 meters, and the length of the top excavation working face is usually controlled to be about 3.5 meters.

2) And (4) downwards excavating the ancient site body to about 1 m depth according to the determined excavation working surface.

3) An inner baffle is arranged along the periphery, and an inner winding rope is used for firmly winding the periphery.

4) And continuously excavating the dam body downwards to the depth of about 1 m.

5) And further synchronously reinforcing and protecting the periphery of the excavated ancient site body by using an inner baffle and an inner winding rope.

6) And repeating the steps 4-5 until the distance between the two units and the ancient site bottom is excavated, and confirming that the distance between the two units and the ancient site bottom is not less than 2.5 meters.

7) The four sides are provided with high outer baffles (or keels) at intervals, and are firmly wound by outer winding ropes.

The underpinning structure is arranged and installed as follows:

1) the number of the required steel pipes is determined according to the actual length of each underpinning unit body, the diameter of each steel pipe is about 800mm, the length of each steel pipe is twice the width of the dam body, and the distance between the two steel pipes is controlled to be about 1 meter.

2) The number and the specification of the bottom steel plates are determined according to the arrangement design of the steel pipe lower slide ways, the length of the bottom steel plates is about 2 meters wider than the dam body, and the width of the bottom steel plates is preferably just across 2 to 3 steel pipes.

3) And determining the specifications of channel steel and angle steel according to the arrangement design of the bottom steel plate. The lengths of the channel steel and the angle steel are equal to the total width of the bottom steel plate. The model of the angle steel is preferably 20# hot-rolled double angle steel, the model of the channel steel is preferably 40# c hot-rolled common channel steel, and the models of the channel steel and the angle steel can be determined by the relevant mechanics calculation of the actual dam body.

4) And horizontally jacking densely-arranged steel pipes as a lower slideway at the bottom of the translation dam along the translation direction, when the pipe jacking is difficult, digging soil guide holes by a horizontal spiral drill, penetrating the guide holes by using a steel cable, connecting the front end of the guide holes to power equipment, connecting the rear end of the guide holes to a traction ring at the front end of the steel pipes, and drawing the guide holes in place by the power equipment.

5) And (3) punching bar-shaped steel plates into the platform along the steel pipe upper skin at intervals, wherein the front ends and the rear ends of the bar-shaped steel plates extend out of the underpinned ancient site body units, and when punching is difficult, a concrete wire cutting saw can be adopted to cut horizontal seams in soil bodies close to the upper part of the steel pipe.

6) And a head steel connector is arranged at the front end of the dam body along the translation direction and is tightly connected with the steel plate by bolts.

7) And tail angle steel is arranged at the rear end of the dam body along the translation direction and is tightly connected with the steel plate by bolts.

The ancient site body unit translation process comprises the following steps:

1) one end of a traction steel cable penetrates through the counter-force beam and is connected to power equipment, and the other end of the traction steel cable is connected to a reserved index hole in the front end of the steel plate tray through a hook.

2) And starting power equipment to enable the steel plate tray and the upper ancient site body unit to integrally translate.

3) After reaching a translation stroke, the steel cable hook is unhooked from the front of the steel plate tray and hung on a traction ring at the front end of the steel pipe, and the steel pipe lower slideway is translated forwards by a stroke one by one at intervals

4) After the lower slide ways of all the steel pipes move forwards, the hooks are unhooked, the steel pipes are secondarily connected to the front end of the steel plate tray, and the steel plate tray begins to move horizontally in a second stroke

5) And repeating the translation stroke of the step 2-5 until the dam body reaches the designated target position, and finishing the translation operation.

Claims

1. A technology for protecting engineering site large block segmentation underpinning translation is characterized in that: the technology comprises the procedures of traction counter-force support construction, ancient site body segmentation enclosure construction, underpinning structure arrangement and installation, translation power equipment installation, ancient site body unit translation, in-place connection and the like, wherein the dam body unit enclosure structure is constructed from the side surface of a dam body soil body from inside to outside: the underpinning structure consists of closely-arranged steel pipe lower slideways and steel plate trays; a traction ring is arranged in front of each steel pipe; the steel plate tray consists of a group of strip steel plates, tail connecting angle steel and a head steel connecting piece, wherein the strip steel plates are long along the moving direction; the bottom steel plate and the strip-shaped steel plate of the head connecting piece are provided with traction cable holes with coincident positions, the diameter of each cable hole is about 40mm, the traction cable holes are usually arranged in a gap between two steel pipes, the traction counter-force support is composed of a steel pipe pile driven into a foundation, a post-prestressed anchor rod, a connecting Hualan screw and a horizontal counter-force beam, and steel cable holes are reserved in counter-force steel beams.

2. The engineering site large block segmentation, underpinning and translation protection technology as claimed in claim 1, wherein: the construction sequence of the project is as follows: firstly, constructing a counterforce device at a preset position, and installing a horizontal power device; then carrying out horizontal underpinning structure and ancient site body segmentation enclosure construction (the sequence of the two construction items can be exchanged, but the two construction items are not constructed at the same time); then starting a horizontal power device to finish the translation of the ancient site body unit; finally, the in-place connection is completed at the target position.

3. The traction reaction force abutment construction according to claim 1, wherein: firstly, pressing a steel pipe pile into a set position, wherein the diameter of the steel pipe pile is about 800mm, and the steel pipe pile extends out of the ground to have a certain height; then, a reinforced concrete prestressed anchor rod is driven into the side of the dam away from the dam at a certain distance, and the end part of the anchor rod just extends out of the ground; then, connecting the steel pipe pile with the upper end of the anchor rod by using a turn buckle and a steel cable, and rotating the turn buckle to tighten the steel cable; next, a reaction beam is installed in a manner of clinging to the steel pipe pile, and a steel cable hole is reserved in the reaction beam along the translation direction; and finally, a translational power device (a jack or a plate rolling machine) is arranged on the counter-force beam.

4. The ancient site body segmentation enclosure construction of claim 1, characterized in that: the length of each section of unit body is about 5 to 10 meters, a slotting part is arranged between two sections of ancient site body units to form an inverted splayed slope, the excavation section is gradually reduced along with the increase of the excavation depth, the length of the upper excavation working face is about 3.5 meters, and the distance between two underpinning units is not less than 2.5 meters when the ancient site body units are excavated to the bottom of the dam.

5. The ancient site body segmentation enclosure construction of claim 1, characterized in that: the construction method of carrying out layered excavation, excavation and enclosure synchronously is adopted for construction, the height of each layer is about 1 m, an inner baffle is arranged along the periphery of each layer of excavation, and an inner winding rope is used for winding firmly from the periphery; when the dam is excavated to the bottom of the dam, the inner baffle and the inner winding rope are completely finished, the high-through outer baffles (or keels) are installed on four sides at intervals, and the outer winding rope is used for winding firmly.

6. The underpinning structure arrangement installation of claim 1, wherein: the method comprises the steps of firstly arranging closely-arranged steel pipe lower runners, then installing a bottom strip-shaped steel plate, and finally connecting tail connecting angle steel and a head steel connecting piece.

7. The steel pipe glidepath arrangement of claim 6, wherein: the diameter of each steel pipe for arrangement is about 800mm, the length is twice of the width of a dam body, the distance between two steel pipes is about 1 m, when pipe jacking is difficult, a soil guide hole can be dug through a horizontal spiral drill, a steel cable penetrates through the guide hole, the front end of the steel pipe is connected to power equipment, the rear end of the steel pipe is connected with a traction ring at the front end of the steel pipe, and the steel pipe is pulled by the power equipment to be in place.

8. The bottom steel plate installation of claim 6, wherein: the length of the bottom steel plate used for installation is about 2 meters wider than the dam body, the width of the bottom steel plate can just span 2 to 3 steel pipes, and when the strip-shaped steel plate is difficult to drive, a concrete wire cutting saw can be adopted to cut horizontal seams in the soil body close to the upper part of the steel pipe.

9. The tail connecting angle steel according to claim 6, characterized in that: the angle steel sets up in the rear end of underpinning structure along the translation direction, is the essential element that provides horizontal jacking force for upper portion ancient ruins body, and its length equals with bottom steel sheet total width, and through bolt and bottom bar steel sheet zonulae occludens.

10. The head steel connection according to claim 6, wherein: the head steel connecting piece is arranged at the front end of the underpinning structure along the translation direction and is formed by welding a strip steel plate and a reversed channel steel, an index hole is reserved in the strip steel plate and is a main component bearing traction force of a steel cable, the length of the strip steel connecting piece is equal to the total width of the bottom steel plate, and the strip steel connecting piece is tightly connected with the bottom steel plate through a bolt.

11. The archaeological site body unit translation of claim 1, wherein: the method of alternately implementing a plurality of translation strokes is adopted for operation, firstly, one end of a traction steel cable penetrates through a counterforce beam and is connected to power equipment, and the other end of the traction steel cable is connected to a reserved index hole at the front end of a steel plate tray through a hook; then starting power equipment to enable the steel plate tray and the upper ancient site body unit to integrally translate; after reaching a translation stroke, unhooking the steel cable hook from the front of the steel plate tray, hanging the steel cable hook on a traction ring at the front end of the steel pipe, and translating the steel pipe lower slideway forward by a stroke one by one at intervals; after all the steel pipe lower runners move forwards, unhooking, secondarily connecting the unhooking to the front end of the steel plate tray, and starting the second stroke translation; and repeating the translation stroke until the dam body reaches the designated target position, and finishing the translation operation.