CN111663561B

CN111663561B - Construction method of industrial building damping foundation

Info

Publication number: CN111663561B
Application number: CN202010602560.XA
Authority: CN
Inventors: 范福东
Original assignee: Zhejiang Jinyu Engineering Consulting Co ltd
Current assignee: Zhejiang Jinyu Engineering Consulting Co ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-09-24
Anticipated expiration: 2040-05-22
Also published as: CN111663562A; CN111535355B; CN111535355A; CN111663561A; CN111663562B

Abstract

The invention discloses a construction method of an industrial building shock absorption foundation, which is characterized by comprising the following construction steps: (1) installing a hydraulic valve on a prefabricated support column, and pressing the prefabricated support column into a soil body; (2) excavating a soil body to a designed bottom elevation; laying geotextile on the arch-shaped substrate; the raft plates and the concrete inverted beam templates adopt brick moulding beds; (3) binding reinforcing steel bars of the raft and the concrete inverted beam, erecting a template of the raft and the concrete inverted beam, and reserving damping holes in the interior of the raft; (4) pouring concrete of the raft and the concrete inverted beam; (5) placing a damping block in the damping hole, placing the damping block on the supporting column, laying a damping material on the damping block, and laying a steel plate on the damping material for sealing; (6) arranging a buttress on the steel plate at the position of the damping hole; (7) a bearing frame is arranged on the buttress; (8) industrial equipment is arranged on the bearing frame. The invention has good damping effect.

Description

Construction method of industrial building damping foundation

Technical Field

The invention relates to the field of buildings, in particular to a construction method of an industrial building damping foundation.

Background

In industrial buildings, continuous and violent vibration loads can often occur to heavy loads of industrial equipment and the like, when the heavy loads act on foundation soil, the weight of the heavy loads are jointly borne by soil particles in a foundation and pore water in the foundation, when saturated soil is under the action of vibration loads, the soil particles in the foundation contain different sizes of the soil particles, the displacement speeds of the soil particles are different, the soil particles which are originally in a tightly connected state are always in a suspended state due to different sinking displacement speeds of the soil particles, the soil particles can bounce up and down and leave each other at times, when the soil particles are connected, mutual transmission force is exerted, once the soil particles are suspended, the transmission force is lost, at the moment, the vibration loads of the industrial equipment are not borne by the soil particles losing the transmission force and act on the pore water in the foundation, and the water has no shear strength and has no capacity of bearing the vibration loads, therefore, the foundation soil is unevenly sunk after liquefaction, so that the industrial buildings lose support and a large area of subsidence occurs. The problem of liquefaction of the soil mass below the industrial plant is therefore a problem that the engineering technicians are in urgent need of solving.

Disclosure of Invention

In view of the above, the invention provides a construction method of an industrial building shock absorption foundation, which solves the problem of soil liquefaction under industrial equipment.

In order to achieve the purpose, the invention adopts the following technical scheme:

the construction method of the industrial building shock absorption foundation comprises a bearing frame, buttresses, a raft and support columns, wherein the bearing frame is arranged below the equipment, the buttresses are arranged below the bearing frame, inverted concrete beams are arranged on the periphery of the raft, and four reinforcing steel bars with the diameter of 25 mm are adopted as main reinforcement of the inverted concrete beams. The raft foundation is made into an arch shape, the concrete inverted beam and the arch bottom plate form an enclosure frame, the displacement of soil particles in the enclosure frame tends to be uniform, and the liquefaction phenomenon is not easy to occur.

Damping holes are formed in the raft plates and comprise steel plates, damping materials and damping blocks, the steel plates are located below the buttress, the thickness of each steel plate is 12-15 mm, the steel plates are arranged at the tops of the damping holes and used as the top covers of the damping holes, the damping materials are arranged in the damping holes and adopt steel slag, sand-stone mixture, yellow sand, rubber powder and sawdust; the shock absorption block is arranged below the shock absorption material.

The support column is located below the snubber block, and the support column bottom is the taper shape, produces the splitting and destroys when being convenient for the support column gets into the soil body.

The technical principle of the invention is as follows: set up the bearing frame below the industrial equipment, the bearing frame is shelved on the buttress, can have the space between basis and the bearing frame, sets up the shock attenuation hole below the buttress, and the steel sheet is adopted in the capping of shock attenuation hole, places below the bearing frame when the jack, unloads the pressure of buttress, and the steel sheet is dismantled, and the material in the shock attenuation hole is changed according to the jarring power of difference to gain best shock attenuation effect. Simultaneously, set up the support column below the shock attenuation hole and transmit the seismic force to the deep soil body, through the holding power to the effectual supporting seat that has improved of support column bottom slip casting and side direction slip casting, at first the anti liquefaction ability of vertical component. The bottom of the foundation forms an enclosure frame formed by the concrete inverted beam and the arched substrate, so that the liquefaction phenomenon of the soil body is effectively inhibited. In addition, the geotextile is arranged between the bottom of the foundation and the foundation soil, so that the displacement difference between foundation soil particles is adjusted, and the effect of reducing liquefaction of the soil body at the lower part of the foundation is also achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a construction method of an industrial building damping foundation provided by the invention;

FIG. 2 is a schematic cross-sectional view of a support post according to the present invention;

figure 3 is a schematic view of the shock-absorbing block provided by the invention.

In the figure, the device comprises a force bearing frame 1, a force bearing frame 2, buttresses 3, a steel plate 4, a damping material 5, a damping block 6, a support column 7, a hydraulic valve 8, a concrete inverted beam 9, a raft, a rubber block 10, a spring 11, a spring 12 and a grouting hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a construction method of an industrial building damping foundation, which comprises a bearing frame 1, buttresses 2, a raft 9 and support columns 6, wherein the bearing frame 1 is arranged below equipment, the buttresses 2 are arranged below the bearing frame 1, concrete inverted beams 8 are arranged on the periphery of the raft 9, and four reinforcing steel bars with the diameter of 25 mm are adopted as main ribs of the concrete inverted beams 8. The base of the raft 9 is made into an arch shape, and the concrete inverted beam 8 and the arch-shaped bottom plate form an enclosure frame.

Damping holes are formed in the raft 9 and comprise steel plates 3, damping materials 4 and damping blocks 5, the steel plates 3 are located below the buttress 2, the thickness of the steel plates 3 is 12-15 mm, the steel plates 3 are arranged at the tops of the damping holes and used as the top covers of the damping holes, the damping materials 4 are arranged in the damping holes, and the damping materials 4 are steel slag, sand-stone mixture, yellow sand, rubber powder and sawdust; the shock absorbing material 4 is provided with a shock absorbing block 5 below.

The support column 6 is positioned below the shock absorption block 5, and the bottom of the support column 6 is conical.

Furthermore, in the industrial damping foundation, the height of the bearing frame 1 is 500-550 mm, and the width is 250-300 mm.

Further, in the industrial damping foundation, the height of the buttress 2 is 400-500 mm, and the length and the width are 400-450 mm.

Further, in the industrial damping foundation, the height of the concrete inverted beam 8 is 600-700 mm, and the width of the concrete inverted beam is 300-350 mm.

Further, in the industry shock attenuation basis, the arch height is 200 ~ 250 millimeters, and the distance of arch top surface from raft board 9 top surface is 300 ~ 350 millimeters.

Further, industry shock attenuation basis in, the installation can be dismantled according to the earthquake power of difference to steel sheet 3, shock-absorbing material 4 confirms according to the earthquake power of difference, when earthquake power more than or equal to 60MPa, shock-absorbing material 4 adopts the sawdust, when the earthquake power is less than 60MPa and more than or equal to 50MPa, shock-absorbing material 4 adopts rubber powder, when the earthquake power is less than 50MPa and more than or equal to 30MPa, shock-absorbing material 4 adopts yellow sand, when the earthquake power is less than 30MPa and more than 10MPa, shock-absorbing material 4 adopts the grit mixture, the grit weight ratio is 1 in the grit mixture: 1, when the vibration force is less than or equal to 10MPa, the damping material 4 is made of steel slag. The determination of the damping material 4 is determined according to the optimal damping rate in the damping experiment, and table 1 shows the damping effect of different materials.

TABLE 1 damping effect of different materials

Further, in the industrial damping foundation, the distance between the top surface of the damping block 5 and the top surface of the foundation is 500-600 mm, and the height of the damping block 5 is 200-250 mm.

Further, in the industrial damping foundation, the damping block 5 is composed of a rubber block 10 and a spring 11.

Further, in the industrial damping foundation, the support column 6 is arranged in a tubular shape, the outer section of the support column 6 is square, the length of the square is 350-400 mm, the inner section of the support column is square, the length of the square is 150-200 mm, and the thickness of the section is 150-200 mm.

Furthermore, in the industrial damping foundation, four grouting holes 12 are arranged in the supporting column 6, the diameter of each grouting hole 12 is 12-15 mm, and the grouting holes 12 penetrate through the bottom of the supporting column 6.

Furthermore, in the industrial damping foundation, the support column 6 is further provided with a lateral slurry outlet hole, the distance between the lateral slurry outlet hole and the bottom of the support column 6 is 400-450 mm, the diameter of the lateral slurry outlet hole is 10-12 mm, a hydraulic valve 7 is arranged on the inner side of the lateral slurry outlet hole, the hydraulic valve 7 is opened when the grouting pressure exceeds 2.5MPa, the lateral soil body is sprayed with the slurry, and the slurry is made of water glass. The bottom soil body grouting and the lateral soil body grouting can show the supporting force of the supporting column 6, and the table 2 shows the mechanical property comparison between the presence and absence of the lateral soil body grouting.

Table 2 shows the mechanical property comparison between the presence and absence of lateral soil body grouting

The construction steps comprise:

(1) installing a hydraulic valve 7 on the prefabricated support column 6, and then pressing the prefabricated support column 6 into a soil body;

(2) excavating a soil body to a designed bottom elevation;

laying geotextile on the arch-shaped substrate; the raft 9 and the concrete inverted beam 8 template adopt a brick mould;

(3) binding a raft 9 and a concrete inverted beam 8 steel bar, erecting a raft 9 and a concrete inverted beam 8 template, and reserving damping holes in the interior of the raft 9;

(4) pouring concrete for the raft 9 and the concrete inverted beam 8;

(5) placing a damping block 5 in the damping hole, placing the damping block 5 on the support column 6, laying a damping material 4 on the damping block 5, and laying a steel plate 3 on the damping material 4 for sealing;

(6) the buttress 2 is arranged on the steel plate 3 at the position of the damping hole, the buttress 2 adopts a concrete block, and the concrete strength of the concrete block is more than C35;

(7) a bearing frame 1 is arranged on the buttress 2;

(8) industrial equipment is arranged on the bearing frame 1.

If the industrial equipment is replaced, the following construction steps are adopted:

(1) jacking the bearing frame 1 by using a jack;

(2) before jacking, a steel base plate is laid on the ground, the area of the steel base plate is 1.5-2.5 square meters, and therefore shearing damage caused by local stress of a foundation is avoided;

(3) removing the buttress 2 after jacking;

(4) disassembling the steel plate 3 after the buttress 2 is removed;

(5) and selecting the damping material 4 according to the vibration force of the industrial equipment, and putting the damping material 4 into the damping hole.

(6) A buttress 2 is arranged on the steel plate 3 at the position of the damping hole;

(7) a bearing frame 1 is arranged on the buttress 2;

(8) industrial equipment is arranged on the bearing frame 1.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method of an industrial building shock absorption foundation is characterized by comprising the following steps: the device comprises a bearing frame, buttresses, a raft plate and support columns, wherein the bearing frame is arranged below the device, the buttresses are arranged below the bearing frame, inverted concrete beams are arranged on the periphery of the raft plate, and four reinforcing steel bars with the diameter of 25 mm are adopted as main reinforcing bars of the inverted concrete beams; the raft foundation is made into an arch, and the concrete inverted beam and the arch bottom plate form an enclosure frame;

damping holes are formed in the raft plates, each damping hole comprises a steel plate, a damping material and a damping block, the steel plates are located below the buttress, the thickness of each steel plate is 12-15 mm, the steel plates are arranged at the tops of the damping holes and used as the top covers of the damping holes, the damping materials are arranged in the damping holes, and the damping materials are steel slag or sand-stone mixture or yellow sand or rubber powder or sawdust; a damping block is arranged below the damping material;

the supporting column is positioned below the damping block, and the bottom of the supporting column is conical;

the construction steps comprise:

(1) installing a hydraulic valve on a prefabricated support column, and pressing the prefabricated support column into a soil body;

(2) excavating a soil body to a designed bottom elevation;

laying geotextile on the arch-shaped substrate; the raft plates and the concrete inverted beam templates adopt brick moulding beds;

(3) binding reinforcing steel bars of the raft and the concrete inverted beam, erecting a template of the raft and the concrete inverted beam, and reserving damping holes in the interior of the raft;

(4) pouring raft plates and concrete inverted beam concrete;

(5) placing a damping block in the damping hole, placing the damping block on the supporting column, laying a damping material on the damping block, and laying a steel plate on the damping material for sealing;

(6) arranging a buttress on the steel plate at the position of the damping hole, wherein the buttress adopts a concrete block, and the concrete strength of the concrete block is more than C35;

(7) a bearing frame is arranged on the buttress;

(8) industrial equipment is arranged on the bearing frame.