Technical field
[0001] The invention belongs in the construction field, treating more specifically a method
for creating a new building under and around an authentically preserved architectural
monument, which is located on an infirm base.
Prior art
[0002] From the prior art there are solutions known, where a new building is created under
an existing building.
[0003] A vertical dredging-type structural design is known (
JP4092020, Obhayashi Corp, published on 25.03.1992), where the soil is excavated from beneath
an existing building, using a method, where a steel-sheet cylinder is pressed down
while using the existing building as the supporting points for the jack. A cylinder-shaped
shaft is dug into the soil and jacks are positioned between the upper edge of the
shaft and the building. The shaft is pressed down with the compressive force of the
jacks and with the inner concave. When the reaction force to the traction(repulsive)
force of the jacks is removed, the shaft will sink in the bottom and a building can
be created under the existing building without using temporary structures.
[0004] Another known method is that of producing an insulated foundation recess to an existing
building (
JP 184144, Taisei Corp, published on 15.07.1997). The soil around the existing building is
excavated, whereby a recess is formed. The soil that is immediately under the framework
casing of the existing building is also excavated, to achieve an underground space
that joins the lower part of the recess, while the upper parts of the existing piles,
where the piles have been installed in the soil in the lower part of the framework
casing, remain exposed. New piles are driven into the soil of the lower part of the
recess. Then a pad footing together with new piles is created in the upper soil of
the joined casing recess. The support wall that surrounds the side walls of the casing
is built into a joint casing together with the pad footing. In the underground space
a pressure-resistant slab is formed, to increase the contact area with the underground
soil. In this case the existing piles will penetrate the pressure-resistant slab without
being in contact with it.
[0005] A method that is closest to this invention by the technical nature, is the method
for creating a new building under an existing building (
JP 58123925, Tekken Constr Co, published on 23.07.1983). In that solution the foundation of the
existing building is joined with a new created support beam and is installed by means
of a jack between the installed new support beam and support piles so that the new
support beam will rise up, the weight of the existing building will be transferred
to support piles. The horizontal layer is formed by inserting a support material between
the support beam and support piles, when the support material has expanded and hardened,
the jack is removed, a recess is excavated and the new building is created under the
existing building.
[0006] A drawback of the known solutions is that these do not allow creating a new building
under architectural monuments, since special requirements apply to the preservation
of architectural monuments.
Description of the invention
[0007] In built-up areas it is often necessary to create buildings near (beneath, next to
and/or on top) an architectural monument due to natural factors, economic conditions
or functional needs. At this, proceeding from historical principles, the existing
architectural heritage should be preserved in its authentic form, while ensuring that
it will be displayed. A majority of architectural monuments are not on a rigid soil
(e.g. rock), and thereby complex problems will occur with the maintenance of the stability
of the existing building and the new additional building.
[0008] The problem is made more complicated by the fact that architectural monuments are
located on a relatively infirm soil and the level of surface water is at the height
of the pad footing. The level of surface water may not be lowered, since it would
cause subsiding in other buildings in the area. The National Heritage Board requests
the preservation of existing architectural monuments in their authentic form, meaning
that it is not permitted to disassemble and reassemble the monuments.
[0009] The applicant presents a method for creating a building under an architectural monument,
comprising the following stages:
- a rigid loadbearing structure is created under the preserved building, whereas the
structure is produced vertically in two parts;
- the two parts of the structure are created with gaps and by sections as to the plan
and after completing the executed sections, the structural parts that have not been
executed will be created;
- temporary piles will be created, which will rest on and reach to a loadbearing surface
layer;
- cross-beams are installed in the load bearing structure, leaving openings in the structure
for tensile fittings, and the loadbearing structure is pre-tensioned by means of the
tensile fittings in the upper and lower half of the structure;
- jacks are mounted between the cross-beams and temporary piles;
- under the preserved building, a loadbearing and waterproof structure is created around
the underground part of the new building down to the loadbearing soil;
- a horizontal waterproof layer is formed under the underground part of the new building,
between the waterproof structure and the temporary piles;
- the recess for the underground part of the new building is excavated, installing simultaneously
temporary pullers to the load bearing waterproof structure;
- piles, on-pile foundation and loadbearing framework are built;
- temporary piles are removed down to the on-pile foundation, removing also the jacks
and cross-beams, releasing temporary pullers;
- new ground-level structures are built, using transparent materials for external borders;
- drainage is created around the underground part of the new building.
List of figures
[0010] The figure presents the conceptual solution for creating a building under and around
an architectural monument.
Exemplary embodiment of the invention
[0011] A rigid loadbearing structure 2 is created vertically under the authentically preserved
building 1. The rigid loadbearing structure 2 is first executed at a half width of
structure 2. The rigid and loadbearing structure 2 is created with gaps and by sections
as to the plan. After the completion of the executed section, the uncompleted parts
of the rigid and loadbearing structure 2 are created. Then, after the first half of
structure 2 has achieved its rigidity, the second half of structure 2 is executed
similarly to the first half. During the construction of structure 2, cross-beams 3
are installed in the structure, whereat the installation of a cross-beam is preceded
by the installation of temporary piles 5, which reach down to and rest on the loadbearing
soil layer 6. Structure 2 is provided with openings for tensile fittings 4. The rigid
and load bearing structure 2 is pre-tensioned with tensile fittings 4 in the upper
and lower half. When the loadbearing structure 2 has been built, the cross-beam 3
is supported by means of temporary piles 5. Jacks 7 are installed between the cross-beams
3 and temporary piles 5, providing the temporary piles 5 with pre-tension. Pre-tension
is provided to temporary piles 5 in order to prevent possible subsiding of the authentically
preserved building 1 as a result of a possible unevenness of loadbearing soil layer
6 and deformation.
[0012] After resting the authentically preserved building 1 on the loadbearing soil layer
6, a loadbearing and waterproof structure 9 is created around the sideways perimeter
of the underground part 8 of the new building to be created under building 1, reaching
down to the loadbearing surface 6. The loadbearing and waterproof structure 9 is created
under high pressure by pressing liquid binder into infirm soil 10, resulting in a
slurry of the soil and the binder, which will turn into a hard and waterproof material,
i.e. the loadbearing and waterproof structure 9, in the course of hardening. At the
joint of the perimeters of the authentically preserved building 1 and the new underground
part 8 of the new building, a loadbearing and waterproof structure 9 will be created
in vertical, similarly to the loadbearing structure of the preserved building 1.
[0013] After the completion of the loadbearing and waterproof structure 9, a horizontal
waterproof layer 11 is created under the underground part 8 of the new created building.
The waterproof horizontal layer 11 is created in a concave form between the loadbearing
and waterproof structure 9 and temporary piles 5. Due to the concave form of the waterproof
horizontal layer 11, an arch will form between the load bearing and waterproof structure
and temporary piles 5, holding the buoyancy force of surface water.
[0014] After the completion of the loadbearing and waterproof structure 9 and the waterproof
horizontal layer 11, the recess for the underground part 8 of the new building will
be excavated by reach sections. This is followed by building piles 12, on-pile foundation
13 and loadbearing framework 14, after which the temporary piles 5 will be removed
down to on-pile foundation 13. Jacks 7 and cross-beams 3 are also removed. During
the creation of the recess, the temporary pulls 15 are installed to the load bearing
and waterproof structure 9 to receive the side trust of soil. The temporary pulls
15 are released after the completion of the underground part 8 of the new building.
[0015] After the creation of the underground part 8 of the new building under the authentically
preserved building 1, the new surface structures 16 are built, using transparent materials
for the external borders 17, making it possible to display the authentically preserved
building 1.
[0016] The level of surface water 18 next to the underground part 8 of the new building
of the authentically preserved building 1 is not lowered and in order to prevent the
local rise of surface water level, drainage 19 will be created around the underground
part 8 of the new building. Drainage 19 will ensure that the surface water level 18
will remain unchanged in the vicinity of the underground part 8 of the new building.
1. Method for creating of a building under an architectural monument, comprising of the
stages: supporting the foundation of the existing building by means of support beams
and piles and with jacks; a horizontal layer is created, the jacks are removed, an
underground recess is excavated, a new building is built under the existing building,
characterized in that
- a rigid loadbearing structure (2) is built under the building in order to support
the foundation of the existing building (1), whereas the structure (2) is produced
vertically in two parts;
- two parts of the structure (2) are created with gaps and by sections as to the plan,
and after the completed sections are ready, the structure (2) is created in the uncompleted
parts;
- the structure (2) is pre-tensioned with the tensile fittings (4) from the upper
and lower part of the structure (2);
- temporary piles are driven (5);
- cross-beams (3) are installed in the structure (2) and the cross-beams are supported
with temporary piles (5);
- jacks (7) are installed between the cross-beams (3) and the temporary piles (5);
- under the building (1), around the underground part (8), a loadbearing and waterproof
structure (9) is created down to the load bearing surface;
- under the underground part (8) of the new a horizontal waterproof layer (11) is
building, formed between the structure (9) and temporary piles (5);
- a recess is excavated for the new building and temporary pullers (15) are installed
to the structure (9);
- piles (12), on-pile foundation (13) and load bearing framework (14) are built;
- temporary piles (5), jacks (7), cross-beams (3) and temporary pullers (15) are removed;
- new ground structures (15) are built, using a transparent material for external
borders (17) and
- drainage (19) is created around the underground part (8) of the new building.
2. Method accordingly to claim 1, characterized in that structure (2) is produced by executing structure (2) first in a half width of structure
(2) and when the first part has achieved its rigidity, the second part of structure
(2) is executed, leaving openings for the tensile fittings (4) in the upper and lower
part of structure (2).
3. Method accordingly to claim 1, characterized in that the temporary piles (5) are driven so that they rest in a loadbearing layer of soil
(6).
4. Method accordingly to claim 1, characterized in that structure (9) is loadbearing and waterproof, executed by pressing liquid binder into
infirm soil (10) under high pressure.
5. Method accordingly to claim 1, characterized in that the temporary piles (5) are removed down to the on-pile foundation (13).